/* ==========================================================================
   KuGua Blog — Shared Front-End Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
    --primary-color: #2d3748;
    --secondary-color: #4a5568;
    --accent-color: #667eea;
    --hover-color: #764ba2;
    --muted-color: #718096;
    --placeholder-color: #a0aec0;
    --sidebar-text: #5a67a8;

    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-bg-solid: rgba(255, 255, 255, 0.88);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);

    --navbar-height: 80px;
    --content-max-width: 800px;
    --content-max-width-wide: 900px;
    --content-max-width-article: 1040px;
    --sidebar-width: 280px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition-fast: 0.25s ease;
    --transition-medium: 0.35s ease;

    --focus-ring: 0 0 0 3px rgba(102, 126, 234, 0.35);
}

/* --------------------------------------------------------------------------
   Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

input,
button,
textarea,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

a {
    color: inherit;
}

ul,
ol {
    list-style: none;
}

/* --------------------------------------------------------------------------
   Accessibility — Skip Link
   -------------------------------------------------------------------------- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 10000;
    padding: 0.75rem 1.25rem;
    background: var(--primary-color);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    box-shadow: var(--glass-shadow);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 1rem;
    outline: none;
    box-shadow: var(--focus-ring);
}

/* --------------------------------------------------------------------------
   Body & Typography
   -------------------------------------------------------------------------- */
body {
    font-family:
        'PingFang SC',
        'Microsoft YaHei',
        'SF Pro Display',
        -apple-system,
        BlinkMacSystemFont,
        'Segoe UI',
        Roboto,
        'Helvetica Neue',
        Arial,
        sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 50%, #e8eef5 100%);
    min-height: 100vh;
    color: var(--primary-color);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

body:has(.navbar) {
    padding-top: var(--navbar-height);
    min-height: 150vh;
}

body:not(:has(.navbar)) {
    min-height: 110vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary-color);
}

p {
    color: var(--secondary-color);
}

code,
pre {
    font-family: 'SF Mono', 'Cascadia Code', Consolas, Monaco, monospace;
}

:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* --------------------------------------------------------------------------
   Index Page — Landing
   -------------------------------------------------------------------------- */
.bg-decoration {
    position: fixed;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

.bg-decoration.one {
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    top: -100px;
    right: -100px;
}

.bg-decoration.two {
    background: linear-gradient(135deg, #00b4d8, #0077b6);
    bottom: -100px;
    left: -100px;
}

.container {
    width: 100%;
    max-width: 520px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.logo {
    margin-bottom: 1.5rem;
}

.logo-circle {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.logo-circle:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

.logo-circle:active {
    transform: scale(0.98);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.1em;
}

.welcome-box {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem 2rem;
    box-shadow: var(--glass-shadow);
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.welcome-box:hover {
    box-shadow: 0 12px 40px rgba(31, 38, 135, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.welcome-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--primary-color);
    letter-spacing: 0.02em;
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.btn-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.875rem;
}

.btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--secondary-color);
    text-decoration: none;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 14px;
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast),
        border-color var(--transition-fast), box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

.btn:hover,
.btn:focus,
.btn:visited {
    text-decoration: none;
}

.btn:hover {
    color: var(--accent-color);
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    transition: transform 0.3s ease;
}

.btn:hover .btn-icon {
    transform: scale(1.1);
}

/* --------------------------------------------------------------------------
   Navbar
   -------------------------------------------------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--glass-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 3rem;
    z-index: 1000;
    transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.navbar.navbar-solid {
    background: var(--glass-bg-solid);
    height: 70px;
}

.navbar.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

.nav-logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.08em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.nav-logo-mini {
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 1.3rem;
    font-weight: 700;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.nav-links li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    font-size: 1.05rem;
    transition: color var(--transition-fast);
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.navbar.navbar-solid .nav-links a {
    color: var(--primary-color);
    letter-spacing: 0.03em;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.nav-icon {
    font-size: 1.1rem;
}

.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    background: transparent;
    border: none;
    cursor: pointer;
    gap: 5px;
    padding: 0;
}

.hamburger-btn span {
    width: 24px;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
    transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.login-btn {
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 5px 18px rgba(102, 126, 234, 0.35);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.login-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.45);
}

.login-btn:active {
    transform: scale(0.98);
}

.login-btn-corner {
    flex-shrink: 0;
    margin-left: auto;
}

/* 导航链接居中，Logo 左、登录右 */
@media (min-width: 769px) {
    .navbar {
        justify-content: center;
    }

    .nav-logo {
        position: absolute;
        left: 3rem;
    }

    .login-btn-corner {
        position: absolute;
        right: 3rem;
        margin-left: 0;
    }

    .nav-actions {
        position: absolute;
        right: 3rem;
    }

    .nav-actions .login-btn-corner {
        position: static;
        right: auto;
    }

    .nav-links {
        justify-content: center;
    }
}

/* --------------------------------------------------------------------------
   Sidebar — Mobile Menu
   -------------------------------------------------------------------------- */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: none;
    transition: opacity var(--transition-medium);
}

.sidebar {
    position: fixed;
    top: 0;
    left: calc(-1 * var(--sidebar-width));
    width: var(--sidebar-width);
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 2100;
    display: flex;
    flex-direction: column;
    transition: left var(--transition-medium);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.sidebar-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-close {
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 50%;
    font-size: 1.2rem;
    color: var(--secondary-color);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--primary-color);
}

.sidebar-links {
    list-style: none;
    padding: 1rem 0;
    margin: 0;
    flex: 1;
    overflow-y: auto;
}

.sidebar-links li {
    margin: 0;
}

.sidebar-links a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1rem;
    transition: background var(--transition-fast), border-color var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-links a:hover {
    background: rgba(126, 87, 194, 0.08);
    border-left-color: var(--accent-color);
}

.sidebar-links .nav-icon {
    font-size: 1.15rem;
}

.sidebar-login-btn {
    margin: 1rem 1.5rem 1.5rem;
    padding: 0.75rem;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border: none;
    color: #fff;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.sidebar-login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(126, 87, 194, 0.4);
}

.sidebar-decoration {
    margin: 1rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 20px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.deco-ring {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.75rem;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

.deco-icon {
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
}

.deco-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--sidebar-text);
    margin-bottom: 0.75rem;
}

.deco-dots {
    display: flex;
    gap: 8px;
}

.deco-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-color);
    animation: bounce 1.5s ease-in-out infinite;
}

.deco-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.deco-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* --------------------------------------------------------------------------
   Main Content Layout
   -------------------------------------------------------------------------- */
.content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 2rem;
}

.content-wide {
    max-width: var(--content-max-width-wide);
}

.content-article {
    max-width: var(--content-max-width-article);
    width: 100%;
}

.hero-section {
    text-align: center;
    padding: 4rem 0;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

.article-section,
.project-section,
.gallery-section,
.contact-section,
.about-section {
    margin-top: 2rem;
}

.project-section,
.gallery-section,
.contact-section,
.about-section {
    margin-top: 4rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.section-title-link {
    text-decoration: none;
    color: inherit;
    display: inline-block;
}

.section-title-link:hover .section-title {
    color: var(--accent-color);
}

.page-home .section-title {
    padding-bottom: 0;
    border-bottom: none;
}

.page-home .section-header-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.page-home .section-header-row .section-title {
    margin-bottom: 0;
}

.page-home .section-view-all {
    flex-shrink: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--muted-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.page-home .section-view-all:hover {
    color: var(--accent-color);
}

.page-home .hero-stats {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem 0.75rem;
    margin-bottom: 1.5rem;
}

.page-home .hero-stats[hidden] {
    display: none !important;
}

.page-home .hero-stat {
    font-size: 0.95rem;
    color: var(--secondary-color);
}

.page-home .hero-stat strong {
    color: var(--accent-color);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.page-home .hero-stat-sep {
    color: var(--placeholder-color);
    user-select: none;
}

.page-home .hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.page-home .hero-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 8.5rem;
    padding: 0.65rem 1.35rem;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.page-home .hero-btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.35);
}

.page-home .hero-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(102, 126, 234, 0.45);
}

.page-home .hero-btn-secondary {
    color: var(--accent-color);
    background: rgba(255, 255, 255, 0.65);
    border: 1px solid rgba(102, 126, 234, 0.35);
}

.page-home .hero-btn-secondary:hover {
    transform: translateY(-2px);
    background: rgba(102, 126, 234, 0.08);
}

.page-home .scroll-container.is-compact,
.page-home .scroll-content.is-compact {
    max-height: none;
    overflow: visible;
}

.page-home .scroll-container.is-compact {
    padding-bottom: 1.25rem;
}

.page-home .guestbook-messages-label {
    margin: 1.25rem 0 0.75rem;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--secondary-color);
}

.page-home .guestbook-messages-scroll.is-compact {
    background: transparent;
    border: none;
    padding: 0;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

.page-home .contact-section .contact-info {
    background: rgba(255, 255, 255, 0.35);
}

.page-home .about-section .about-content {
    box-shadow: 0 8px 28px rgba(102, 126, 234, 0.08);
}

.site-footer {
    max-width: var(--content-max-width);
    margin: 3rem auto 2rem;
    padding: 1.25rem 2rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1rem;
    font-size: 0.88rem;
    color: var(--muted-color);
    border-top: 1px solid rgba(102, 126, 234, 0.15);
}

.site-footer-copy {
    margin: 0;
}

.site-footer-top {
    border: 1px solid rgba(102, 126, 234, 0.25);
    background: rgba(255, 255, 255, 0.55);
    color: var(--secondary-color);
    border-radius: 999px;
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.site-footer-top:hover {
    color: var(--accent-color);
    border-color: rgba(102, 126, 234, 0.45);
    background: rgba(102, 126, 234, 0.08);
}

/* --------------------------------------------------------------------------
   Article Cards & Scroll Container
   -------------------------------------------------------------------------- */
.article-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.article-card-link {
    text-decoration: none;
    display: block;
    color: inherit;
}

.article-card-wrap {
    position: relative;
    margin-bottom: 1rem;
}

.article-card-wrap .article-card {
    margin-bottom: 0;
}

.card-demo-btn,
.project-demo-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.75rem;
    padding: 0.45rem 1rem;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.3);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card-demo-btn:hover,
.project-demo-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(102, 126, 234, 0.4);
    color: #fff;
    text-decoration: none;
}

.card-demo-badge {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    background: rgba(102, 126, 234, 0.12);
    color: var(--accent-color);
    font-size: 0.75rem;
    font-weight: 600;
}

.project-card.has-demo {
    border-color: rgba(102, 126, 234, 0.25);
}

.article-card-link:hover .article-card {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.article-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.article-meta {
    font-size: 0.875rem;
    color: var(--muted-color);
    margin-bottom: 0.75rem;
}

.article-excerpt {
    font-size: 0.95rem;
    color: var(--secondary-color);
    line-height: 1.6;
}

.scroll-container {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-height: 420px;
    overflow: hidden;
    position: relative;
}

.scroll-content {
    overflow-y: scroll;
    max-height: 420px;
    padding-right: 1.25rem;
    padding-bottom: 1rem;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) rgba(126, 87, 194, 0.1);
}

.scroll-content > * {
    margin-bottom: 1.5rem;
}

.scroll-content > *:last-child {
    margin-bottom: 0.5rem;
}

.scroll-content::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

.scroll-content::-webkit-scrollbar-track {
    background: rgba(126, 87, 194, 0.1);
    border-radius: 6px;
    margin: 8px 0;
}

.scroll-content::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-color), var(--hover-color));
    border-radius: 6px;
    min-height: 40px;
    box-shadow: 0 3px 8px rgba(102, 126, 234, 0.35);
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.scroll-content::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--hover-color), #5a3d8a);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.5);
}

.scroll-content::-webkit-scrollbar-button {
    display: none;
}

/* --------------------------------------------------------------------------
   Guestbook
   -------------------------------------------------------------------------- */
.guestbook-container {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.guestbook-form {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.guestbook-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.guestbook-form input,
.guestbook-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.6);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.guestbook-form input:focus,
.guestbook-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: var(--focus-ring);
}

.guestbook-form textarea {
    resize: vertical;
    min-height: 100px;
}

.guestbook-form .submit-btn {
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    margin-top: 0.5rem;
}

.guestbook-form .submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message-item {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.message-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.message-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.message-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.message-meta {
    display: flex;
    flex-direction: column;
}

.message-name {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.message-time {
    font-size: 0.8rem;
    color: var(--secondary-color);
}

.message-content {
    margin: 0;
    color: var(--primary-color);
    line-height: 1.6;
    font-size: 0.95rem;
}

.message-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: 0.75rem;
}

.message-like-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.65rem;
    border: 1px solid rgba(102, 126, 234, 0.25);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.5);
    color: var(--secondary-color);
    font-size: 0.85rem;
    line-height: 1;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.message-like-btn:hover:not(:disabled) {
    color: #e2557f;
    border-color: rgba(226, 85, 127, 0.45);
    background: rgba(226, 85, 127, 0.08);
    transform: translateY(-1px);
}

.message-like-btn.is-liked {
    color: #e2557f;
    border-color: rgba(226, 85, 127, 0.5);
    background: rgba(226, 85, 127, 0.12);
}

.message-like-btn:disabled {
    opacity: 0.6;
    cursor: wait;
}

.message-like-icon {
    font-size: 1rem;
    line-height: 1;
}

.message-like-count {
    min-width: 0.5rem;
    font-variant-numeric: tabular-nums;
}

.message-admin-reply {
    margin-top: 0.85rem;
    padding: 0.85rem 1rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08), rgba(118, 75, 162, 0.06));
    border-left: 3px solid var(--accent-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.message-admin-reply-header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.45rem;
}

.message-admin-reply-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
}

.message-admin-reply-time {
    font-size: 0.78rem;
    color: var(--secondary-color);
}

.message-admin-reply-content {
    margin: 0;
    color: var(--primary-color);
    line-height: 1.65;
    font-size: 0.92rem;
}

/* --------------------------------------------------------------------------
   Contact & About
   -------------------------------------------------------------------------- */
.contact-info {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    max-width: 720px;
    margin: 0 auto;
}

.contact-item {
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.55);
    border-radius: var(--radius-md);
    padding: 1.1rem 1.25rem;
    min-height: 88px;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

a.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.12);
    border-color: rgba(102, 126, 234, 0.25);
}

a.contact-item:hover .contact-text {
    color: var(--accent-color);
}

.contact-item:not(a):hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

.contact-icon {
    font-size: 1.25rem;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, rgba(126, 87, 194, 0.12), rgba(99, 102, 241, 0.12));
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.contact-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--secondary-color);
    letter-spacing: 0.02em;
}

.contact-text {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary-color);
    line-height: 1.4;
    word-break: break-word;
}


/* Easter egg: 关于我角落小叶子 */
.about-content > .egg-leaf-secret {
    all: unset;
    position: absolute;
    right: 1rem;
    bottom: 0.95rem;
    z-index: 2;
    display: block;
    width: 1.4rem;
    height: 1.4rem;
    cursor: pointer;
    color: #7cb342;
    opacity: 0.32;
    text-decoration: none;
    transform-origin: center bottom;
    animation: eggLeafFloat 4.2s ease-in-out infinite;
    transition: opacity 0.25s ease, transform 0.28s ease, color 0.25s ease;
}

.about-content > .egg-leaf-secret .egg-leaf-svg {
    width: 100%;
    height: 100%;
    display: block;
    filter: drop-shadow(0 1px 1px rgba(76, 124, 48, 0.12));
}

.about-content > .egg-leaf-secret:hover,
.about-content > .egg-leaf-secret:focus-visible {
    opacity: 0.95;
    color: #558b2f;
    transform: scale(1.15) rotate(-10deg);
    animation-play-state: paused;
}

.about-content > .egg-leaf-secret::after {
    content: '叶叶？';
    position: absolute;
    right: calc(100% + 0.35rem);
    top: 50%;
    transform: translate(5px, -50%);
    padding: 0.15rem 0.45rem;
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 500;
    line-height: 1.2;
    font-family: inherit;
    color: #4a7c35;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 2px 8px rgba(74, 124, 53, 0.12);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.about-content > .egg-leaf-secret:hover::after,
.about-content > .egg-leaf-secret:focus-visible::after {
    opacity: 1;
    transform: translate(0, -50%);
}

.about-content > .egg-leaf-secret:focus-visible {
    outline: 2px solid rgba(129, 199, 132, 0.45);
    outline-offset: 3px;
    border-radius: 50%;
}

@keyframes eggLeafFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-3px) rotate(6deg); }
}

@media (max-width: 768px) {
    .about-content > .egg-leaf-secret {
        right: 0.75rem;
        bottom: 0.7rem;
        width: 1.25rem;
        height: 1.25rem;
    }
    .about-content > .egg-leaf-secret::after {
        display: none;
    }
}

.about-content {
    position: relative;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    transition: box-shadow var(--transition-fast);
}

.about-content:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.about-avatar {
    flex-shrink: 0;
}

.avatar-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 2.5rem;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(126, 87, 194, 0.3);
}

.about-text h3 {
    font-size: 1.35rem;
    color: var(--primary-color);
    margin: 0 0 0.5rem;
}

.about-text p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    line-height: 1.7;
    margin: 0.5rem 0;
}

/* --------------------------------------------------------------------------
   List Pages — Articles & Projects
   -------------------------------------------------------------------------- */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.1rem;
    color: var(--secondary-color);
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.articles-list .article-card {
    padding: 1.75rem;
    margin-bottom: 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.articles-list .article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
}

.article-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.article-rank {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: 10px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
}

.article-info {
    flex: 1;
}

.articles-list .article-title {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.articles-list .article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 0;
}

.article-category {
    background: rgba(102, 126, 234, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    color: var(--accent-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: 1.5rem;
}

.project-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.15);
}

.project-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-card .project-demo-btn {
    margin-top: 1rem;
}

.project-rank {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.project-meta {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.project-excerpt {
    font-size: 0.95rem;
    color: var(--secondary-color);
    line-height: 1.6;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tech-tag {
    background: rgba(102, 126, 234, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--accent-color);
}

.no-results {
    text-align: center;
    padding: 4rem;
    color: var(--secondary-color);
}

.projects-grid .no-results {
    grid-column: 1 / -1;
}

/* --------------------------------------------------------------------------
   Search
   -------------------------------------------------------------------------- */
.search-container {
    display: flex;
    gap: 12px;
    margin-bottom: 2rem;
    max-width: 500px;
}

#searchInput,
.search-input {
    flex: 1;
    height: 48px;
    padding: 0 18px;
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-md);
    font-size: 15px;
    outline: none;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

#searchInput:focus,
.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.search-btn {
    padding: 0 1.35rem;
    min-width: 5rem;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.28);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(102, 126, 234, 0.34);
    filter: brightness(1.03);
}

.search-btn:active {
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Article Detail Page
   -------------------------------------------------------------------------- */
.content .article-header {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin-bottom: 2rem;
    display: block;
}

.content .article-header .article-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.content .article-header .article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.content .article-header .article-meta > span,
.content .article-header .article-meta .category-badge-dynamic,
.content .article-header .article-meta .status-badge {
    white-space: nowrap;
    flex-shrink: 0;
}

.content .article-header .article-category {
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    color: #fff;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
}

.article-body {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.article-body p {
    font-size: 1.05rem;
    color: var(--secondary-color);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.article-body-empty {
    color: var(--muted-color);
    font-size: 0.95rem;
    text-align: center;
    margin: 0;
}

.article-body h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 2rem 0 1rem;
}

.article-body h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin: 1.5rem 0 0.75rem;
}

.article-body ul,
.article-body ol {
    margin: 1rem 0 1.5rem 1.5rem;
    color: var(--secondary-color);
    line-height: 1.8;
    list-style: disc;
}

.article-body ol {
    list-style: decimal;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body code {
    background: rgba(126, 87, 194, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent-color);
}

.article-body pre {
    background: rgba(45, 55, 72, 0.05);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5rem 0;
}

.article-body pre code {
    background: transparent;
    padding: 0;
    color: var(--secondary-color);
}

/* --------------------------------------------------------------------------
   Project Detail Page
   -------------------------------------------------------------------------- */
.project-header {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin-bottom: 2rem;
}

.project-header .project-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.project-header .project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.project-category {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: #fff;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
}

.project-body {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.project-body p {
    font-size: 1.05rem;
    color: var(--secondary-color);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.project-body h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 2rem 0 1rem;
}

.project-attachments {
    margin-top: 2rem;
    padding: 1.25rem 1.5rem;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 14px;
}

.project-attachments h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.project-attachments ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.project-attachments li {
    margin-bottom: 0.5rem;
}

.project-attachment-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.35rem 0;
    transition: color 0.2s ease;
}

.project-attachment-link:hover {
    color: var(--hover-color);
    text-decoration: none;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1rem 0;
}

/* Article reading: TOC + layout */
.article-reading-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
}

.article-reading-main {
    min-width: 0;
}

.article-toc-mount:empty {
    display: none;
}

.article-toc {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1rem 1.1rem;
}

.article-toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.article-toc-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-color);
}

.article-toc-toggle {
    border: none;
    background: rgba(102, 126, 234, 0.12);
    color: var(--accent-color);
    font-size: 0.8rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    cursor: pointer;
}

.article-toc-list {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    max-height: 50vh;
    overflow: auto;
}

.article-toc-link {
    display: block;
    text-decoration: none;
    color: var(--secondary-color);
    font-size: 0.88rem;
    line-height: 1.45;
    padding: 0.35rem 0.5rem;
    border-radius: 8px;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.article-toc-link:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--accent-color);
}

.article-toc-h3 {
    padding-left: 1rem;
    font-size: 0.84rem;
}

.article-nav-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    max-width: 100%;
}

.pagination-next.article-nav-link {
    align-items: flex-end;
    text-align: right;
}

.article-nav-label {
    font-size: 0.85rem;
    font-weight: 600;
}

.article-nav-title {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--secondary-color);
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (min-width: 1024px) {
    .article-reading-layout.has-toc {
        grid-template-columns: 220px minmax(0, 1fr);
    }

    .article-reading-layout.has-toc .article-toc-mount {
        position: sticky;
        top: 5.5rem;
    }
}

@media (max-width: 768px) {
    .article-nav-link {
        padding: 0.6rem 0.85rem;
    }

    .article-nav-title {
        -webkit-line-clamp: 1;
    }
}

.project-body h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin: 1.5rem 0 0.75rem;
}

.project-body ul,
.project-body ol {
    margin: 1rem 0 1.5rem 1.5rem;
    color: var(--secondary-color);
    line-height: 1.8;
    list-style: disc;
}

.project-body ol {
    list-style: decimal;
}

.project-body li {
    margin-bottom: 0.5rem;
}

.project-body code {
    background: rgba(126, 87, 194, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent-color);
}

.project-body pre {
    background: rgba(45, 55, 72, 0.05);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5rem 0;
}

.project-body pre code {
    background: transparent;
    padding: 0;
    color: var(--secondary-color);
}

.project-body .tech-stack {
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.project-body .tech-tag {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.api-section {
    background: rgba(34, 197, 94, 0.05);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-top: 2rem;
}

.api-section h3 {
    color: #22c55e;
    margin-bottom: 1rem;
}

.api-endpoint {
    background: rgba(0, 0, 0, 0.03);
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
}

.api-endpoint:last-child {
    margin-bottom: 0;
}

.api-method {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: 0.75rem;
}

.api-method.get {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.api-method.post {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.api-method.put {
    background: rgba(251, 191, 36, 0.1);
    color: #f59e0b;
}

.api-method.delete {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.enter-system-container {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.enter-system-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border-radius: 30px;
    text-decoration: none;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    cursor: pointer;
}

.enter-system-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.enter-system-btn .btn-icon {
    font-size: 1.2rem;
    margin-bottom: 0;
    transition: transform 0.3s ease;
}

.enter-system-btn:hover .btn-icon {
    transform: translateX(5px);
}

.project-demo-banner {
    margin-top: 1.25rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.08));
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.project-demo-banner p {
    margin: 0 0 0.75rem;
    color: var(--secondary-color);
    font-size: 0.95rem;
}

.enter-system-btn-inline {
    margin: 0;
}

/* --------------------------------------------------------------------------
   Pagination
   -------------------------------------------------------------------------- */
.pagination {
    display: grid;
    grid-template-columns: minmax(100px, 1fr) auto minmax(100px, 1fr);
    align-items: center;
    gap: 0.75rem 1rem;
    margin-top: 2rem;
    padding: 1.25rem 1.5rem;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
}

.pagination-prev {
    justify-self: start;
    grid-column: 1;
}

.pagination-next {
    justify-self: end;
    grid-column: 3;
    margin-left: 0;
}

.pagination-center {
    grid-column: 2;
    justify-self: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.65rem;
}

.pagination > .pagination-info:only-child {
    grid-column: 1 / -1;
    justify-self: center;
    text-align: center;
}

.pagination-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    text-decoration: none;
    color: var(--accent-color);
    font-weight: 500;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.pagination-link:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.pagination-link.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination-info {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.pagination-jump-form {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.4rem;
}

.pagination-jump-label {
    font-size: 0.85rem;
    color: var(--secondary-color);
}

.pagination-jump-input {
    width: 4.5rem;
    height: 36px;
    padding: 0 0.5rem;
    border: 1px solid rgba(102, 126, 234, 0.25);
    border-radius: 8px;
    text-align: center;
    font-size: 0.9rem;
    background: #fff;
    -moz-appearance: textfield;
    appearance: textfield;
}

.pagination-jump-input::-webkit-outer-spin-button,
.pagination-jump-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.pagination-jump-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.pagination-jump-unit {
    font-size: 0.85rem;
    color: var(--secondary-color);
}

.pagination-jump-btn {
    height: 36px;
    padding: 0 0.85rem;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.pagination-jump-btn:hover {
    opacity: 0.92;
    transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   Modal — Login / Register / Forgot Password
   -------------------------------------------------------------------------- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    justify-content: center;
    align-items: center;
    z-index: 2000;
    padding: 1rem;
}

.modal-overlay.is-open,
.modal-overlay[style*="flex"] {
    display: flex;
}

.modal-content {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 420px;
    padding: 2.5rem 2rem;
    position: relative;
    box-shadow:
        var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    animation: modalFadeIn 0.3s ease;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: var(--primary-color);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: rotate(90deg);
}

.modal-close:focus-visible {
    box-shadow: var(--focus-ring);
}

.modal-header {
    text-align: center;
    margin-bottom: 2rem;
}

.modal-logo {
    margin-bottom: 1rem;
}

.modal-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.modal-header p {
    font-size: 0.95rem;
    color: var(--secondary-color);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-color);
}

.input-wrapper {
    position: relative;
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-md);
    padding: 0 1rem;
    display: flex;
    align-items: center;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-icon {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.form-group input {
    width: 100%;
    padding: 1rem 0;
    background: transparent;
    border: none;
    outline: none;
    font-size: 1rem;
    color: var(--primary-color);
}

.form-group input::placeholder {
    color: var(--placeholder-color);
}

.form-group input:focus-visible {
    outline: none;
}

.form-group select {
    width: 100%;
    padding: 1rem 0;
    background: transparent;
    border: none;
    outline: none;
    font-size: 1rem;
    color: var(--primary-color);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.form-group select:focus-visible {
    outline: none;
}

.form-group select option {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    padding: 0.5rem;
}

.input-wrapper.has-select::after {
    content: '▼';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.6rem;
    color: var(--secondary-color);
    pointer-events: none;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--secondary-color);
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-color);
}

.checkbox-label input:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.forgot-link {
    font-size: 0.875rem;
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.forgot-link:hover {
    color: var(--hover-color);
}

.forgot-link:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 2px;
}

.login-submit {
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--hover-color));
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.login-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.login-submit:active {
    transform: translateY(0);
}

.login-submit:focus-visible {
    box-shadow: var(--focus-ring);
}

.register-link,
.switch-link {
    text-align: center;
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-top: 1rem;
}

.register-link a,
.switch-link a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.register-link a:hover,
.switch-link a:hover {
    color: var(--hover-color);
}

.register-link a:focus-visible,
.switch-link a:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 2px;
}

.modal-tabs {
    display: flex;
    background: rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 1.5rem;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    border: none;
    background: transparent;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--secondary-color);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.tab-btn.active {
    background: #fff;
    color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.tab-btn:hover:not(.active) {
    color: var(--accent-color);
}

.tab-btn:focus-visible {
    box-shadow: var(--focus-ring);
}

/* --------------------------------------------------------------------------
   Back Link & Footer
   -------------------------------------------------------------------------- */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 1.5rem;
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--hover-color);
}

.back-link:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 2px;
}

.footer {
    margin-top: 2.5rem;
    color: var(--muted-color);
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    text-align: center;
}

/* --------------------------------------------------------------------------
   Responsive — Tablet (768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --navbar-height: 70px;
    }

    .navbar {
        display: grid;
        grid-template-columns: 44px minmax(0, 1fr) auto;
        align-items: center;
        justify-content: unset;
        padding: 0 max(0.75rem, env(safe-area-inset-right)) 0 max(0.75rem, env(safe-area-inset-left));
        gap: 0.35rem;
    }

    .hamburger-btn {
        display: flex;
        grid-column: 1;
        grid-row: 1;
        width: 44px;
        height: 44px;
        flex-shrink: 0;
    }

    .nav-links {
        display: none;
    }

    .nav-logo {
        grid-column: 2;
        grid-row: 1;
        justify-self: center;
        font-size: 1.15rem;
        min-width: 0;
        max-width: 100%;
        letter-spacing: 0.04em;
    }

    .nav-user-menu,
    .login-btn-corner {
        grid-column: 3;
        grid-row: 1;
        justify-self: end;
        flex-shrink: 0;
    }

    .navbar .login-btn:not(.login-btn-corner) {
        display: none;
    }

    .login-btn-corner {
        display: flex;
        padding: 0.5rem 0.9rem;
        font-size: 0.85rem;
        white-space: nowrap;
    }

    .nav-actions {
        position: static;
        grid-column: 3;
        grid-row: 1;
        justify-self: end;
        gap: 0.35rem;
        max-width: 52vw;
    }

    .nav-actions .nav-user-menu {
        display: none;
    }

    .nav-actions .login-btn-corner {
        position: static;
        padding: 0.45rem 0.7rem;
        font-size: 0.8rem;
    }

    .theme-toggle-btn {
        width: 36px;
        height: 36px;
        font-size: 0.95rem;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .nav-icon {
        display: none;
    }

    .hero-section {
        padding: 2.5rem 0 2rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .content,
    .content-wide {
        max-width: 100%;
        padding: 1rem;
    }

    .page-header {
        margin-bottom: 2rem;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .article-header {
        flex-direction: column;
        gap: 1rem;
    }

    .article-rank {
        align-self: flex-start;
    }

    .articles-list .article-title {
        font-size: 1.25rem;
    }

    .articles-list .article-meta {
        gap: 0.5rem 0.75rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        flex-direction: column;
        text-align: center;
    }

    .contact-info {
        grid-template-columns: 1fr;
        max-width: 100%;
    }

    .contact-item {
        min-height: auto;
        padding: 1rem;
    }

    .guestbook-form .form-row {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .page-home .hero-btn {
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }

    .page-home .section-header-row {
        align-items: center;
    }

    .site-footer {
        padding: 1.25rem 1rem;
        margin-bottom: 1.5rem;
        flex-direction: column;
        text-align: center;
    }

    .scroll-container {
        padding: 1rem;
        max-height: 360px;
    }

    .scroll-content {
        max-height: 360px;
        padding-right: 0.5rem;
    }

    .content .article-header .article-title,
    .project-header .project-title {
        font-size: 1.5rem;
        word-break: break-word;
    }

    .content .article-header,
    .article-body,
    .project-header,
    .project-body {
        padding: 1.25rem;
    }

    .content .article-header .article-meta,
    .project-header .project-meta {
        gap: 0.5rem 0.75rem;
    }

    .project-demo-banner {
        display: flex;
        flex-direction: column;
        align-items: stretch;
    }

    .project-demo-banner p {
        word-break: break-word;
    }

    .enter-system-btn-inline,
    .card-demo-btn,
    .project-demo-btn {
        width: 100%;
        justify-content: center;
        box-sizing: border-box;
    }

    .pagination {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        padding: 1rem;
        gap: 0.65rem;
    }

    .pagination-center {
        grid-column: 1 / -1;
        grid-row: 1;
        width: 100%;
    }

    .pagination-prev {
        grid-row: 2;
        grid-column: 1;
        justify-self: start;
    }

    .pagination-next {
        grid-row: 2;
        grid-column: 2;
        justify-self: end;
    }

    .pagination > .pagination-info:only-child {
        grid-row: 1;
    }

    .pagination-jump-form {
        width: 100%;
        flex-wrap: wrap;
        justify-content: center;
    }

    .pagination-link {
        font-size: 0.85rem;
        padding: 0.5rem 0.65rem;
    }

    .list-toolbar {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        gap: 0.85rem;
    }

    .list-toolbar .search-container {
        flex-direction: column;
        width: 100%;
    }

    .list-toolbar .search-btn {
        width: 100%;
    }

    .filter-group {
        width: 100%;
        min-width: 0;
    }

    .filter-select {
        width: 100%;
        min-width: 0;
    }

    .search-container {
        max-width: 100%;
        flex-direction: column;
    }

    .search-btn {
        width: 100%;
    }

    .modal-content {
        max-height: min(90vh, 640px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .auth-gate-card {
        padding: 2rem 1.25rem;
    }

    .preview-banner {
        font-size: 0.8rem;
        padding: 0.55rem 0.75rem;
        line-height: 1.45;
    }
}

/* --------------------------------------------------------------------------
   Responsive — Mobile (480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
    .btn-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .welcome-text {
        font-size: 1.125rem;
    }

    .welcome-box {
        padding: 2rem 1.5rem;
    }

    .logo-circle {
        width: 65px;
        height: 65px;
    }

    .btn {
        padding: 1rem 0.5rem;
    }

    .btn-icon {
        font-size: 1.5rem;
    }

    .navbar {
        grid-template-columns: 40px minmax(0, 1fr) auto;
        padding: 0 max(0.5rem, env(safe-area-inset-right)) 0 max(0.5rem, env(safe-area-inset-left));
    }

    .nav-logo {
        font-size: 1rem;
        gap: 0.35rem;
    }

    .login-btn-corner {
        padding: 0.45rem 0.7rem;
        font-size: 0.8rem;
    }

    .modal-content {
        padding: 2rem 1.25rem;
        border-radius: var(--radius-lg);
    }

    .modal-header h2 {
        font-size: 1.5rem;
    }

    .enter-system-btn {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        width: 100%;
        justify-content: center;
    }

    .pagination-jump-form {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .pagination-jump-input {
        width: 100%;
        text-align: center;
    }

    .pagination-jump-btn {
        width: 100%;
    }

    .pagination-link {
        min-width: 0;
        max-width: 46vw;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .articles-list .article-card {
        padding: 1.25rem;
    }

    .project-card {
        padding: 1.25rem;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .contact-text {
        word-break: break-all;
    }

    .front-toast {
        left: 1rem;
        right: 1rem;
        width: auto;
        transform: translateY(20px);
        text-align: center;
    }

    .front-toast.show {
        transform: translateY(0);
    }
}

@media (max-width: 320px) {
    .btn-grid {
        grid-template-columns: 1fr;
    }
}

/* 登录门禁与用户菜单 */
.auth-gate {
    display: flex;
    justify-content: center;
    padding: 3rem 1rem 4rem;
}

.auth-gate-card {
    max-width: 480px;
    width: 100%;
    text-align: center;
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.12);
}

.auth-gate-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.auth-gate-card h2 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.auth-gate-card p {
    color: var(--secondary-color);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.auth-gate-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.auth-gate-actions .login-submit {
    width: auto;
    min-width: 140px;
    padding: 0.75rem 1.5rem;
}

.auth-gate-secondary {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(102, 126, 234, 0.3);
    background: #fff;
    color: var(--accent-color);
    font-weight: 600;
    cursor: pointer;
}

.auth-gate-hint {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: #718096;
}

.nav-user-menu {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-shrink: 0;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    z-index: 2;
    flex-shrink: 0;
}

.theme-toggle-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid rgba(102, 126, 234, 0.28);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(248, 250, 252, 0.82));
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    line-height: 1;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.12);
    transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle-btn:hover {
    transform: translateY(-1px);
    border-color: rgba(102, 126, 234, 0.45);
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.22);
}

.theme-toggle-btn:active {
    transform: translateY(0);
}

.sidebar-theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    width: calc(100% - 2rem);
    margin: 0.75rem 1rem 0;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(102, 126, 234, 0.22);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.88), rgba(248, 250, 252, 0.72));
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sidebar-theme-btn:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: rgba(102, 126, 234, 0.35);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.12);
}

.nav-user-name {
    font-size: 0.88rem;
    color: var(--secondary-color);
    font-weight: 600;
    white-space: nowrap;
    max-width: 7rem;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-logout-btn {
    padding: 0.48rem 1rem;
    border-radius: 999px;
    border: 1px solid rgba(102, 126, 234, 0.28);
    background: rgba(255, 255, 255, 0.92);
    color: var(--accent-color);
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.2;
    white-space: nowrap;
    flex-shrink: 0;
    cursor: pointer;
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-logout-btn:hover {
    background: #fff;
    border-color: rgba(102, 126, 234, 0.45);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.16);
    transform: translateY(-1px);
}

.nav-logout-btn:active {
    transform: translateY(0);
}

.nav-auth-required {
    opacity: 0.85;
}

.sidebar-user {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar-user span {
    font-weight: 600;
    color: var(--primary-color);
}

.card-lock-badge {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    font-size: 0.75rem;
    font-weight: 600;
}

.preview-banner {
    margin-bottom: 1rem;
    padding: 0.65rem 1rem;
    border-radius: 10px;
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.35);
    color: #b45309;
    font-size: 0.875rem;
    font-weight: 600;
    text-align: center;
}

.guestbook-form.guestbook-locked {
    opacity: 0.72;
    pointer-events: none;
}

.guestbook-form.guestbook-locked .submit-btn {
    opacity: 0.7;
}

.guestbook-login-hint {
    font-size: 0.9rem;
    color: #718096;
    margin-bottom: 0.75rem;
}

.front-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(255, 255, 255, 0.96);
    color: var(--primary-color);
    padding: 0.875rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    z-index: 10001;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.front-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.front-toast.error {
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #dc2626;
}

@media (min-width: 769px) {
    .nav-actions {
        max-width: min(42vw, 320px);
    }
}

@media (max-width: 768px) {
    .nav-user-menu {
        position: static;
        margin-left: 0;
        display: flex;
        align-items: center;
        gap: 0.35rem;
    }

    .nav-user-name {
        display: none;
    }

    .nav-logout-btn {
        padding: 0.4rem 0.7rem;
        font-size: 0.8rem;
        white-space: nowrap;
    }
}

/* --------------------------------------------------------------------------
   Category badges (dynamic color from admin)
   -------------------------------------------------------------------------- */
.category-badge-dynamic {
    display: inline-block;
    padding: 0.2rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(102, 126, 234, 0.12);
    color: var(--accent-color);
}

.view-count {
    color: var(--secondary-color);
    font-size: 0.85rem;
}

/* --------------------------------------------------------------------------
   List toolbar & pagination
   -------------------------------------------------------------------------- */
.list-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 1.5rem;
    padding: 1.1rem 1.25rem;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid rgba(102, 126, 234, 0.14);
    box-shadow: 0 4px 18px rgba(102, 126, 234, 0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.list-toolbar .search-container {
    flex: 1;
    min-width: 220px;
    margin-bottom: 0;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-width: 160px;
}

.filter-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--secondary-color);
    letter-spacing: 0.02em;
}

.filter-select {
    height: 48px;
    padding: 0 2.25rem 0 0.95rem;
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-md);
    min-width: 160px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary-color);
    font-size: 0.95rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23667eea' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.85rem center;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.filter-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.list-pagination {
    margin-top: 2rem;
}

button.card-demo-btn {
    border: none;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
    width: 100%;
    box-sizing: border-box;
}

/* --------------------------------------------------------------------------
   Guestbook — my messages
   -------------------------------------------------------------------------- */
.my-messages-block {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px dashed rgba(102, 126, 234, 0.25);
}

.my-messages-title {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--accent-color);
}

.message-item-mine {
    background: rgba(102, 126, 234, 0.06);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
}

.message-status-badge {
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
    background: rgba(245, 158, 11, 0.15);
    color: #d97706;
}

.message-status-rejected .message-status-badge {
    background: rgba(239, 68, 68, 0.12);
    color: #dc2626;
}

.message-item-mine.message-status-approved .message-status-badge {
    background: rgba(34, 197, 94, 0.12);
    color: #16a34a;
}

/* --------------------------------------------------------------------------
   Data loading — progress bar, tips, skeletons
   -------------------------------------------------------------------------- */
@keyframes kugua-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

@keyframes kugua-load-bar {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

@keyframes kugua-tip-pulse {
    0%, 100% { opacity: 0.45; transform: scale(0.9); }
    50% { opacity: 1; transform: scale(1); }
}

.kugua-load-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    z-index: 10050;
    overflow: hidden;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.25s ease;
    background: rgba(102, 126, 234, 0.12);
}

.kugua-load-bar.is-active {
    opacity: 1;
}

.kugua-load-bar-inner {
    width: 35%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--hover-color), #a78bfa);
    animation: kugua-load-bar 1.1s ease-in-out infinite;
    border-radius: 0 2px 2px 0;
}

.kugua-load-tip {
    position: fixed;
    left: 50%;
    bottom: 1.5rem;
    transform: translateX(-50%) translateY(12px);
    z-index: 10049;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    max-width: min(92vw, 420px);
    padding: 0.65rem 1rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(102, 126, 234, 0.2);
    box-shadow: 0 10px 30px rgba(31, 38, 135, 0.12);
    color: var(--secondary-color);
    font-size: 0.88rem;
    line-height: 1.4;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.kugua-load-tip.is-active {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.kugua-load-tip.is-background {
    bottom: auto;
    top: calc(var(--navbar-height, 80px) + 0.5rem);
    padding: 0.45rem 0.85rem;
    font-size: 0.8rem;
    border-radius: var(--radius-md);
}

.kugua-load-tip-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-color);
    flex-shrink: 0;
    animation: kugua-tip-pulse 1.2s ease-in-out infinite;
}

.kugua-skel-line,
.kugua-skel-rank,
.kugua-skel-avatar,
.kugua-skel-icon {
    background: linear-gradient(90deg, rgba(148, 163, 184, 0.14) 0%, rgba(148, 163, 184, 0.28) 50%, rgba(148, 163, 184, 0.14) 100%);
    background-size: 200% 100%;
    animation: kugua-shimmer 1.35s ease-in-out infinite;
    border-radius: 6px;
}

.kugua-skel-line { height: 0.85rem; margin-bottom: 0.55rem; }
.kugua-skel-line.short { width: 62%; }
.kugua-skel-line.kugua-skel-title { height: 1.1rem; width: 72%; margin-bottom: 0.7rem; }
.kugua-skel-line.kugua-skel-meta { height: 0.72rem; width: 48%; }
.kugua-skel-line.kugua-skel-hero { height: 1.6rem; width: 85%; margin-bottom: 0.85rem; }
.kugua-skel-line.kugua-skel-stat-value { height: 1.5rem; width: 55%; margin-bottom: 0.45rem; }

.kugua-skel-card,
.kugua-skel-list-item,
.kugua-skel-message,
.kugua-skel-contact,
.kugua-skel-viewer,
.kugua-skel-admin-card {
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: 1.1rem;
}

.kugua-skel-card + .kugua-skel-card,
.kugua-skel-list-item + .kugua-skel-list-item,
.kugua-skel-message + .kugua-skel-message,
.kugua-skel-contact + .kugua-skel-contact,
.kugua-skel-viewer + .kugua-skel-viewer,
.kugua-skel-admin-card + .kugua-skel-admin-card {
    margin-top: 0.85rem;
}

.kugua-skel-list-item,
.kugua-skel-message,
.kugua-skel-contact,
.kugua-skel-viewer,
.kugua-skel-about {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
}

.kugua-skel-rank {
    width: 2rem;
    height: 2rem;
    flex-shrink: 0;
    border-radius: 8px;
}

.kugua-skel-list-body,
.kugua-skel-message-body {
    flex: 1;
    min-width: 0;
}

.kugua-skel-avatar {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    flex-shrink: 0;
}

.kugua-skel-avatar.lg {
    width: 4.5rem;
    height: 4.5rem;
}

.kugua-skel-icon {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 10px;
    flex-shrink: 0;
}

.kugua-skel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}

.kugua-skel-article {
    padding: 0.5rem 0;
}

.kugua-skel-about-text {
    flex: 1;
}

.kugua-skel-host {
    min-height: 4rem;
}

html.kugua-loading .kugua-skel-host {
    pointer-events: none;
}