/* ========================================
   Style: Glassmorphism / Modern Glass
   Design Philosophy: Translucent layers,
   blur effects, depth, modern elegance
   ======================================== */

:root {
    /* Light Theme - Soft Glass */
    --bg-primary: #e8eef5;
    --bg-secondary: rgba(255, 255, 255, 0.6);
    --bg-tertiary: rgba(255, 255, 255, 0.4);
    --bg-card: rgba(255, 255, 255, 0.7);

    --text-primary: #1a1f36;
    --text-secondary: #4a5568;
    --text-muted: #718096;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #ec4899;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);

    --border-color: rgba(255, 255, 255, 0.5);
    --border-hover: rgba(255, 255, 255, 0.8);

    --shadow-sm: 0 2px 10px rgba(99, 102, 241, 0.1);
    --shadow-md: 0 8px 32px rgba(99, 102, 241, 0.15);
    --shadow-lg: 0 16px 48px rgba(99, 102, 241, 0.2);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);

    /* Glass Effect */
    --glass-blur: blur(20px);
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: 1px solid rgba(255, 255, 255, 0.3);

    /* Typography - Modern & Clean */
    --font-display: 'Outfit', 'Helvetica Neue', sans-serif;
    --font-body: 'Outfit', 'Helvetica Neue', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Outfit', sans-serif;

    /* Generous Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 5rem;

    --transition-fast: 200ms ease;
    --transition-base: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Soft Rounded Corners */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;
}
/* ---- Global Resets ---- */
* { -webkit-tap-highlight-color: transparent; }
[data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }
::selection { background: var(--accent-primary); color: #fff; }


/* Dark Theme - Deep Glass */
[data-theme="dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: rgba(30, 30, 50, 0.6);
    --bg-tertiary: rgba(40, 40, 70, 0.4);
    --bg-card: rgba(30, 30, 50, 0.7);

    --text-primary: #f0f0ff;
    --text-secondary: #a0a0c0;
    --text-muted: #6a6a8a;

    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);

    --glass-bg: rgba(30, 30, 50, 0.4);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at 20% 20%, rgba(14, 165, 233, 0.35) 0%, transparent 45%),
        radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.28) 0%, transparent 45%),
        radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.25) 0%, transparent 55%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    min-height: 100vh;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-secondary);
}

/* ========================================
   Sidebar - Left Icon Nav (Dashboard-style)
   ======================================== */

:root {
    --sidebar-w: 56px;
    --bg-sidebar: #12122a;
}

[data-theme="light"] {
    --bg-sidebar: #e8eaed;
}

.sidebar {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    z-index: 100;
    transition: transform 200ms ease;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-icon {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 4px; color: var(--text-muted);
    background: transparent; border: none; cursor: pointer;
    transition: all 200ms ease; position: relative;
    text-decoration: none;
}
.sidebar-icon svg { width: 20px; height: 20px; }
.sidebar-icon:hover { color: var(--accent-primary); background: rgba(99,102,241,0.08); }
.sidebar-icon.active { color: var(--accent-primary); background: rgba(99,102,241,0.12); }
.sidebar-icon.active::before {
    content: ""; position: absolute; left: -8px; top: 50%;
    transform: translateY(-50%);
    width: 3px; height: 20px;
    background: var(--accent-gradient);
    border-radius: 0 3px 3px 0;
}

/* Theme icon visibility */
.sun-icon { display: block; }
.moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

/* ========================================
   Mobile Bar
   ======================================== */

.mobile-bar {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 48px;
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    z-index: 101;
}

.mobile-menu-btn, .mobile-theme-btn {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
}

.mobile-menu-btn svg, .mobile-theme-btn svg { width: 18px; height: 18px; }

.mobile-logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--accent-primary);
}

.sidebar-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.sidebar-overlay.show { display: block; }

/* ========================================
   Main Content Area
   ======================================== */


/* ========================================
   Sidebar (Dashboard-style)
   ======================================== */

:root { --sidebar-w: 56px; --bg-sidebar: #12122a; }
[data-theme="light"] { --bg-sidebar: #e8eaed; }

.sidebar {
    position: fixed; top: 0; left: 0;
    width: var(--sidebar-w); height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex; flex-direction: column;
    justify-content: space-between; align-items: center;
    padding: 12px 0; z-index: 100;
    transition: transform 200ms ease;
}
.sidebar-top { display: flex; flex-direction: column; align-items: center; }
.sidebar-bottom { display: flex; flex-direction: column; align-items: center; }
.sidebar-nav { display: flex; flex-direction: column; gap: 4px; }

.sidebar-icon {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 4px; color: var(--text-muted);
    background: transparent; border: none; cursor: pointer;
    transition: all 200ms ease; position: relative;
    text-decoration: none;
}
.sidebar-icon svg { width: 20px; height: 20px; }
.sidebar-icon:hover { color: var(--accent-primary); background: rgba(99,102,241,0.08); }
.sidebar-icon.active { color: var(--accent-primary); background: rgba(99,102,241,0.12); }
.sidebar-icon.active::before {
    content: ""; position: absolute; left: -8px; top: 50%;
    transform: translateY(-50%);
    width: 3px; height: 20px;
    background: var(--accent-gradient);
    border-radius: 0 3px 3px 0;
}


/* Mobile Bar */
.mobile-bar {
    display: none; position: fixed; top: 0; left: 0; right: 0;
    height: 48px; background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
    align-items: center; justify-content: space-between;
    padding: 0 12px; z-index: 101;
}
.mobile-menu-btn, .mobile-theme-btn {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    background: transparent; border: 1px solid var(--border-color);
    border-radius: 4px; color: var(--text-secondary); cursor: pointer;
}
.mobile-menu-btn svg, .mobile-theme-btn svg { width: 18px; height: 18px; }
.mobile-logo { font-family: var(--font-mono); font-weight: 700; font-size: 0.9rem; color: var(--accent-primary); }
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 99; }
.sidebar-overlay.show { display: block; }

/* Main content offset */
.main-content { margin-left: var(--sidebar-w); }

/* Theme icons */
.sun-icon { display: block; } .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: none; } [data-theme="dark"] .moon-icon { display: block; }

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .mobile-bar { display: flex; }
    .main-content { margin-left: 0; padding-top: 48px; }
}

/* ========================================
   Navigation - Floating Glass Bar (unused)
   ======================================== */

.navbar {
    position: fixed;
    top: var(--space-md);
    left: var(--space-xl);
    right: var(--space-xl);
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

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

.logo-bracket {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-sm);
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-controls {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    padding: 4px;
    border: var(--glass-border);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    color: var(--accent-primary);
    background: var(--bg-card);
}

.nav-btn-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.nav-btn-label {
    white-space: nowrap;
}

.nav-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 4px;
}

.sun-icon { display: block; }
.moon-icon { display: none; }

[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

[data-theme="dark"] .theme-label::after { content: "Light"; }
[data-theme="light"] .theme-label::after { content: "Dark"; }

.theme-label {
    font-size: 0;
}

.theme-label::after {
    font-size: 0.85rem;
}

/* ========================================
   Hero - Layered Glass Layout
   ======================================== */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 100px var(--space-xl) var(--space-2xl);
    position: relative;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.grid-overlay {
    display: none;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--accent-primary);
    top: -150px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-tertiary);
    bottom: -100px;
    left: -100px;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--space-3xl);
    align-items: center;
    width: 100%;
}

.hero-greeting {
    font-size: 0.95rem;
    color: var(--accent-primary);
    margin-bottom: var(--space-sm);
    font-weight: 600;
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: var(--space-md);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.highlight {
    color: var(--accent-primary);
    font-weight: 600;
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
}

.btn {
    padding: var(--space-md) var(--space-xl);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    color: var(--accent-primary);
    border: var(--glass-border);
}

.btn-secondary:hover {
    background: var(--bg-card);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.image-frame {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 3px solid rgba(255, 255, 255, 0.3);
    padding: 8px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.image-placeholder svg {
    width: 80px;
    height: 80px;
    color: var(--accent-primary);
    opacity: 0.5;
}

/* ========================================
   Sections Base
   ======================================== */

.section {
    padding: var(--space-3xl) var(--space-xl);
}

.section-alt {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
}

.section-container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.title-icon {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 400;
    margin-left: var(--space-md);
    line-height: 1;
}

/* Panel dots (Dashboard-style) */
.panel-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}
.panel-dot.cyan    { background: #00d2ff; box-shadow: 0 0 6px #00d2ff; }
.panel-dot.orange  { background: #ff6b35; box-shadow: 0 0 6px #ff6b35; }
.panel-dot.green   { background: #00c853; box-shadow: 0 0 6px #00c853; }
.panel-dot.purple  { background: #7c4dff; box-shadow: 0 0 6px #7c4dff; }

/* link-chip (Dashboard-style) */
.link-chip {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 4px 12px;
    border-radius: 4px;
    text-decoration: none;
    color: #fff;
    background: rgba(99, 102, 241, 0.25);
    border: 1px solid rgba(99, 102, 241, 0.4);
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}
.link-chip:hover {
    background: rgba(99, 102, 241, 0.4);
    border-color: var(--accent-primary);
    color: #fff;
}

/* Feed list (Dashboard-style) */
.feed-list {
    display: flex;
    flex-direction: column;
}
.feed-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    transition: all var(--transition-fast);
}
.feed-item:last-child { border-bottom: none; }
.feed-item:hover { color: inherit; }

.feed-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.feed-dot.cyan    { background: #00d2ff; }
.feed-dot.orange  { background: #ff6b35; }
.feed-dot.green   { background: #00c853; }
.feed-dot.purple  { background: #7c4dff; }

.feed-body {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    flex: 1;
    min-width: 0;
}

.feed-time {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-muted);
    white-space: nowrap;
}

.feed-badge {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    padding: 3px 10px;
    border-radius: 3px;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.04em;
    white-space: nowrap;
}
.badge-new     { background: rgba(0,200,83,0.15);  color: #00c853; }
.badge-talk    { background: rgba(0,210,255,0.15);  color: #00d2ff; }
.badge-award   { background: rgba(255,107,53,0.15); color: #ff6b35; }
.badge-release { background: rgba(124,77,255,0.15); color: #7c4dff; }

.feed-text {
    font-size: 1.02rem;
    color: var(--text-primary);
    flex: 1;
    min-width: 0;
}
.feed-item:hover .feed-text { color: var(--accent-primary); }

/* ========================================
   Back to Top
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    z-index: 90;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, color var(--transition-fast);
}

.back-to-top.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}


/* ========================================
   Footer Links
   ======================================== */

.footer-links {
    display: flex; justify-content: center; gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.footer-icon {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-icon:hover {
    color: var(--accent-primary);
}

.sidebar-date {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--text-muted);
    text-align: center;
    writing-mode: vertical-rl;
    margin-top: 12px;
    letter-spacing: 0.06em;
    opacity: 0.6;
}

.footer-date {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent-primary);
    letter-spacing: 0.04em;
    opacity: 0.7;
}

/* ========================================
   About / Bio
   ======================================== */

.about-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl);
    display: flex;
    align-items: flex-start;
    gap: var(--space-2xl);
    text-align: left;
    transition: border-color 0.4s ease, box-shadow 0.4s ease;
}

.about-card:hover {
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 0 32px rgba(99, 102, 241, 0.12), 0 0 64px rgba(99, 102, 241, 0.06);
}

.about-card-left {
    flex-shrink: 0;
    text-align: center;
}

.about-card-right {
    flex: 1;
    min-width: 0;
}

.about-avatar {
    width: 80px; height: 80px;
    margin: 0 auto var(--space-lg);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted);
    position: relative;
    z-index: 0;
}

.about-avatar::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: var(--accent-gradient);
    z-index: -1;
}

.about-avatar img {
    border-radius: 50%;
    position: relative;
    z-index: 1;
}

.about-avatar svg { width: 40px; height: 40px; }

.about-name {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.about-role {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.about-bio {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.about-interests {
    margin-bottom: var(--space-lg);
}

.about-interests h3 {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.06em;
    margin-bottom: var(--space-md);
}

.about-interests .interests-list {
    justify-content: flex-start;
}

.about-email {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .about-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: var(--space-xl);
    }
    .about-card-right {
        text-align: center;
    }
    .about-interests .interests-list {
        justify-content: center;
    }
    .about-name {
        font-size: 1.3rem;
    }
}

/* ========================================
   Research Interests - Tag Cloud
   ======================================== */

.interests-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    list-style: none;
    padding: 0;
}

.interest-item {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-full);
    padding: 0;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-base);
    overflow: hidden;
}

.interest-item a,
.interest-item span {
    display: block;
    padding: var(--space-sm) var(--space-lg);
    color: var(--text-primary);
    text-decoration: none;
}

.interest-item a {
    cursor: pointer;
}

.interest-item:has(a):hover,
.interest-item:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.interest-item:hover a,
.interest-item:hover span {
    color: #fff;
}

/* ========================================
   Publications - Glass Cards
   ======================================== */

.publications-filter {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.filter-btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: var(--glass-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    background: var(--bg-card);
    color: var(--accent-primary);
}

.filter-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.pub-card {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.pub-card:hover {
    background: var(--bg-card);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.pub-year {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.pub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-xs);
}

.pub-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
    flex: 1;
    min-width: 0;
}

.pub-authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.pub-venue {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

.pub-links {
    display: flex;
    gap: var(--space-sm);
    flex-shrink: 0;
    white-space: nowrap;
}

.pub-link {
    font-size: 0.8rem;
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    color: var(--accent-primary);
    transition: all var(--transition-fast);
}

.pub-link:hover {
    background: var(--accent-gradient);
    color: white;
}

/* ========================================
   Projects - Glass Cards
   ======================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    padding: var(--space-xl);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    cursor: pointer;
}

.project-card:hover {
    background: var(--bg-card);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.tag {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

.project-links {
    display: flex;
    gap: var(--space-md);
}

.project-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.9rem;
    color: var(--accent-primary);
}

.project-link:hover {
    color: var(--accent-secondary);
}

.project-link svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   News - Glass Timeline
   ======================================== */

.news-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.news-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
}

.news-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.news-content {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.news-badge {
    display: inline-block;
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    flex-shrink: 0;
    min-width: 50px;
    text-align: center;
}

.news-text {
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========================================
   Education - Timeline
   ======================================== */

.edu-list { position: relative; padding-left: 24px; }
.edu-list::before {
    content: ""; position: absolute; left: 6px; top: 0; bottom: 0;
    width: 2px; background: var(--border-color);
}
.edu-item { position: relative; padding-bottom: 16px; }
.edu-item:last-child { padding-bottom: 0; }
.edu-marker {
    position: absolute; left: -21px; top: 6px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--accent-primary);
    border: 2px solid var(--bg-primary);
}
.edu-content { }
.edu-period {
    font-family: var(--font-mono); font-size: 0.8rem;
    color: var(--accent-primary); display: block; margin-bottom: 2px;
}
.edu-content h4 {
    font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 2px;
}
.edu-content p {
    font-size: 0.88rem; color: var(--text-secondary);
}

/* ========================================
   Publications - List
   ======================================== */

.pub-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
.pub-item {
    display: flex; gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-base);
}
.pub-item:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}
.pub-year-badge {
    flex-shrink: 0;
    font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600;
    color: var(--accent-primary); min-width: 50px; padding-top: 2px;
}
.pub-info { min-width: 0; }
.pub-info strong {
    display: block; font-size: 1rem; color: var(--text-primary); margin-bottom: 4px;
}
.pub-authors {
    display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 2px;
}
.pub-venue {
    display: block; font-size: 0.82rem; color: var(--text-muted);
}
.pub-links-row {
    display: flex; gap: var(--space-sm); margin-top: var(--space-sm);
}

/* ========================================
   Projects - Card Grid
   ======================================== */

.projects-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg);
}
.project-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
}
.project-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.project-name {
    font-size: 1.05rem; font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-sm);
}
.project-desc {
    font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: var(--space-md);
}
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
    font-family: var(--font-mono); font-size: 0.68rem;
    padding: 3px 10px;
    background: rgba(99,102,241,0.08);
    color: var(--accent-primary);
    border-radius: var(--radius-full);
    border: 1px solid rgba(99,102,241,0.15);
}

/* ========================================
   Contact
   ======================================== */

.contact-links {
    display: flex; gap: var(--space-lg); flex-wrap: nowrap;
}
.contact-item {
    display: flex; align-items: center; gap: var(--space-sm);
    font-family: var(--font-mono); font-size: 0.9rem;
    color: var(--text-secondary); text-decoration: none;
    padding: var(--space-md) var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}
.contact-item:hover { color: var(--accent-primary); border-color: var(--accent-primary); }

/* ========================================
   Seminars - Link Cards
   ======================================== */

.seminars-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.seminar-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.seminar-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px 0 0 4px;
}

.seminar-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}

.seminar-date {
    flex-shrink: 0;
    min-width: 80px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-primary);
}

.seminar-topic {
    flex: 1;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    min-width: 0;
}

/* Right-pointing arrow */
.seminar-arrow {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    position: relative;
    transition: transform var(--transition-base);
}

.seminar-arrow::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-muted);
    border-top: 2px solid var(--text-muted);
    transform: translate(-60%, -50%) rotate(45deg);
}

.seminar-card:hover .seminar-arrow {
    transform: translateX(4px);
}

.seminar-card:hover .seminar-arrow::before {
    border-color: var(--accent-primary);
}

/* ========================================
   Experience - Glass Grid
   ======================================== */

.experience-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
}

.exp-category {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--accent-primary);
}

.exp-category h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.exp-item {
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
}

.exp-period {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-secondary);
    margin-bottom: var(--space-xs);
    font-weight: 500;
}

.exp-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.exp-org {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.exp-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ========================================
   Contact - Glass Links
   ======================================== */

.contact-content {
    text-align: center;
    max-width: 650px;
    margin: 0 auto;
}

.contact-intro {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

    text-decoration: none;
}

.contact-item svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   Footer - Glass Bar
   ======================================== */

.footer {
    padding: var(--space-xl);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    text-align: center;
    border-top: var(--glass-border);
}

.footer-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.visitor-stats {
    margin-top: var(--space-sm);
    font-size: 0.8rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
}

.visitor-stats svg {
    opacity: 0.7;
}

.stat-divider {
    color: var(--border-color);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .image-frame {
        width: 250px;
        height: 250px;
    }

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .mobile-bar { display: flex; }
    .main-content {
        margin-left: 0;
        padding-top: 48px;
    }

    .hero {
        padding: 120px var(--space-md) var(--space-2xl);
    }

    .hero-name {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
        align-items: center;
    }

    .section {
        padding: var(--space-2xl) var(--space-md);
    }

    .pub-card {
        grid-template-columns: 1fr;
    }

    .pub-year {
        margin-bottom: var(--space-xs);
    }

    .news-item {
        grid-template-columns: 1fr;
    }

    .news-date {
        margin-bottom: var(--space-xs);
    }

    .seminar-card {
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .seminar-date {
        min-width: 65px;
        font-size: 0.8rem;
    }

    .seminar-topic {
        font-size: 0.95rem;
    }

    .feed-body { gap: 6px; }
    .feed-time { font-size: 0.72rem; }
    .feed-text { font-size: 0.85rem; }

    .pub-item { flex-direction: column; gap: var(--space-sm); }
    .pub-year-badge { min-width: unset; }

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

    .contact-item {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    .gradient-orb {
        animation: none;
    }
}

/* ========================================
   Hide SPA-specific elements
   ======================================== */

.spa-layout {
    display: block;
}

.about-cards,
.about-news-card {
    display: none;
}

/* Scroll Down Arrow */
.scroll-arrow {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    animation: bounce 2s infinite;
}

.scroll-arrow:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateX(-50%) scale(1.1);
}

.scroll-arrow svg {
    width: 24px;
    height: 24px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ========================================
   Glassmorphism Animations
   ======================================== */

/* Shimmer shine effect */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Glow pulse */
@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(99, 102, 241, 0.3),
                    0 0 40px rgba(139, 92, 246, 0.2);
    }
    50% {
        box-shadow: 0 0 40px rgba(99, 102, 241, 0.5),
                    0 0 80px rgba(139, 92, 246, 0.3);
    }
}

/* Gradient rotation */
@keyframes gradientRotate {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* Glass fade in */
@keyframes glassFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
        filter: blur(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

/* Scale blur in */
@keyframes scaleBlurIn {
    from {
        opacity: 0;
        transform: scale(0.9);
        filter: blur(8px);
    }
    to {
        opacity: 1;
        transform: scale(1);
        filter: blur(0);
    }
}

/* Float animation */
@keyframes glassFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}


/* Image frame with glow pulse */
.image-frame {
    animation: glowPulse 3s ease-in-out infinite, glassFloat 6s ease-in-out infinite;
}

/* Glass card hover effects */
.pub-card {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.pub-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.2);
    background: var(--bg-card);
}

/* Project card with shimmer */
.project-card {
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transition: left 0.6s ease;
}

.project-card:hover::before {
    left: 150%;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* Button with gradient animation */
.btn-primary {
    position: relative;
    overflow: hidden;
    background-size: 200% 200%;
    animation: gradientRotate 3s ease infinite;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

/* News item hover */
.news-item {
    transition: all 0.3s ease;
}

.news-item:hover {
    transform: translateX(8px);
    background: var(--bg-card);
    box-shadow: var(--shadow-md);
}

/* Tag hover with glow */
.tag {
    transition: all 0.2s ease;
}

.tag:hover {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

/* Experience item hover */
.exp-item {
    transition: all 0.3s ease;
}

.exp-item:hover {
    background: var(--bg-card);
    box-shadow: var(--shadow-md);
}

/* Section title gradient text animation */
.section-title .title-icon {
    background-size: 200% 200%;
    animation: gradientRotate 4s ease infinite;
}

/* Pub link hover */
.pub-link {
    transition: all 0.2s ease;
}

.pub-link:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.3);
}

/* ========================================
   Scroll-Triggered Animations
   ======================================== */

/* 基础滚动动画类 - 初始状态 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

/* 可见状态 */
.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Section 滚动动画 */
.section.scroll-animate {
    transform: translateY(40px);
}

.section.scroll-animate.visible {
    transform: translateY(0);
}

/* 卡片滚动动画 - 带玻璃效果 */
.pub-card.scroll-animate,
.project-card.scroll-animate,
.news-item.scroll-animate {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    filter: blur(5px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out, filter 0.5s ease-out;
}

.pub-card.scroll-animate.visible,
.project-card.scroll-animate.visible,
.news-item.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
}

/* 经验项滚动动画 */
.exp-item.scroll-animate {
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.exp-item.scroll-animate.visible {
    opacity: 1;
    transform: translateX(0);
}

/* 联系项滚动动画 - 从下方弹入 */
.contact-item.scroll-animate {
    opacity: 0;
    transform: translateY(20px) scale(0.9);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.contact-item.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Section 标题滚动动画 */
.section-title.scroll-animate {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.section-title.scroll-animate.visible {
    opacity: 1;
    transform: translateX(0);
}

/* 筛选按钮滚动动画 */
.filter-btn.scroll-animate {
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

.filter-btn.scroll-animate.visible {
    opacity: 1;
    transform: scale(1);
}

/* ========================================
   Navbar Scroll Effect
   ======================================== */

.navbar.scrolled {
    top: var(--space-sm);
    left: var(--space-lg);
    right: var(--space-lg);
    padding: 0;
    background: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.15);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(30, 30, 50, 0.6);
}

.navbar.scrolled .nav-container {
    padding: var(--space-sm) var(--space-lg);
}

.navbar.scrolled .nav-logo {
    font-size: 1.1rem;
}

/* ========================================
   Theme Transition Animation
   ======================================== */

.theme-transitioning,
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
    transition: background-color 0.5s ease,
                color 0.5s ease,
                border-color 0.5s ease,
                box-shadow 0.5s ease !important;
}

/* ========================================
   Back to Top Button
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    color: var(--accent-primary);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(99, 102, 241, 0.4);
}

/* ---- Focus Styles ---- */
:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: 3px; border-radius: 2px; }

/* ---- Skip Link ---- */
.skip-link { position: absolute; top: -40px; left: 0; background: var(--accent-primary); color: #fff; padding: 8px 16px; z-index: 9999; font-size: 0.875rem; transition: top 0.2s; }
.skip-link:focus { top: 0; }