/* ===========================
   Custom Properties
   =========================== */
:root {
    --bg:           #09090b;
    --bg-alt:       #0e0e12;
    --surface:      #141418;
    --surface-2:    #1c1c22;
    --border:       #252529;
    --border-hover: #38383e;
    --text:         #f0f0f2;
    --text-muted:   #6b6b74;
    --text-dim:     #2e2e34;
    --accent:       #22d3ee;
    --accent-dim:   rgba(34, 211, 238, 0.08);
    --accent-glow:  rgba(34, 211, 238, 0.12);
    --font-sans:    'Inter', system-ui, -apple-system, sans-serif;
    --font-mono:    'JetBrains Mono', 'Courier New', monospace;
    --radius:       6px;
    --radius-lg:    10px;
    --transition:   180ms ease;
    --pad:          96px;
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    line-height: 1.15;
    font-weight: 600;
    letter-spacing: -0.025em;
}

p { color: var(--text-muted); }
a { color: inherit; text-decoration: none; }

.mono {
    font-family: var(--font-mono);
    letter-spacing: 0;
}

.accent { color: var(--accent); }

/* ===========================
   Layout
   =========================== */
.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 32px;
}

.section { padding: var(--pad) 0; }

.section-alt {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-label {
    color: var(--accent);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.4rem);
    color: var(--text);
    margin-bottom: 52px;
}

/* ===========================
   Navigation
   =========================== */
#navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 22px 0;
    transition: padding var(--transition), background 250ms ease, border-color 250ms ease;
    border-bottom: 1px solid transparent;
}

#navbar.scrolled {
    padding: 14px 0;
    background: rgba(9, 9, 11, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom-color: var(--border);
}

.nav-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text);
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 36px;
}

.nav-links a {
    font-size: 0.825rem;
    color: var(--text-muted);
    transition: color var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px; left: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width 220ms ease;
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); }

.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--text);
    transition: transform 220ms ease, opacity 220ms ease;
    transform-origin: center;
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    inset: 0;
    background: rgba(9, 9, 11, 0.97);
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 280ms ease;
}

.mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

.mobile-menu ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 36px;
}

.mobile-menu a {
    font-size: 1.6rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: -0.02em;
    transition: color var(--transition);
}

.mobile-menu a:hover { color: var(--accent); }

/* ===========================
   Hero
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

#heroCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 32px;
    padding-top: 80px;
}

.hero-label {
    color: var(--accent);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 22px;
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.4s forwards;
}

.hero-name {
    font-size: clamp(3rem, 8.5vw, 6.5rem);
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 1;
    margin-bottom: 28px;
    color: var(--text);
    opacity: 0;
    animation: fadeInUp 0.65s ease 0.6s forwards;
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: clamp(0.85rem, 1.8vw, 1rem);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 48px;
    opacity: 0;
    animation: fadeInUp 0.65s ease 0.8s forwards;
}

#typewriter { color: var(--text); min-width: 2px; }

.cursor {
    color: var(--accent);
    animation: blink 1s step-end infinite;
    line-height: 1;
}

.hero-cta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.65s ease 1s forwards;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    opacity: 0;
    animation: fadeIn 1s ease 1.8s forwards;
}

.scroll-line {
    width: 1px;
    height: 56px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    margin: 0 auto;
    animation: scrollPulse 2.2s ease-in-out infinite;
}

/* Glitch */
.glitch { position: relative; }

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
}

.glitch::before {
    color: #ff2d55;
    clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
    opacity: 0;
    animation: glitch-top 4s ease 1.2s 1 forwards;
}

.glitch::after {
    color: var(--accent);
    clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%);
    opacity: 0;
    animation: glitch-bot 4s ease 1.2s 1 forwards;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 26px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 200ms ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #09090b;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: transparent;
    color: var(--accent);
    box-shadow: 0 0 24px var(--accent-glow);
}

.btn-ghost {
    color: var(--text-muted);
    border-color: var(--border);
}

.btn-ghost:hover {
    color: var(--text);
    border-color: var(--border-hover);
    background: var(--surface);
}

/* ===========================
   About
   =========================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 72px;
    align-items: start;
}

.about-text h2 {
    font-size: clamp(1.75rem, 4vw, 2.4rem);
    margin-bottom: 22px;
    line-height: 1.15;
}

.about-text p { margin-bottom: 14px; }

.text-link {
    color: var(--accent);
    border-bottom: 1px solid rgba(34, 211, 238, 0.25);
    transition: border-color var(--transition);
}
.text-link:hover { border-bottom-color: var(--accent); }

.social-links {
    display: flex;
    gap: 20px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 0.825rem;
    color: var(--text-muted);
    transition: color var(--transition);
}
.social-link:hover { color: var(--accent); }

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color 200ms ease, transform 200ms ease;
}

.stat-card:hover {
    border-color: rgba(34, 211, 238, 0.3);
    transform: translateX(4px);
}

.stat-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    box-shadow: 0 0 8px var(--accent);
}

.stat-title {
    color: var(--text-muted);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 3px;
}

.stat-value {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}

/* ===========================
   Expertise
   =========================== */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.expertise-card {
    padding: 36px 32px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
    transition: border-color 280ms ease, box-shadow 280ms ease;
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity 280ms ease;
}

.expertise-card:hover {
    border-color: rgba(34, 211, 238, 0.25);
    box-shadow: 0 0 48px rgba(34, 211, 238, 0.04);
}

.expertise-card:hover::before { opacity: 1; }

.expertise-icon {
    width: 48px;
    height: 48px;
    color: var(--accent);
    margin-bottom: 24px;
    opacity: 0.85;
}

.expertise-icon svg { width: 100%; height: 100%; }

.expertise-card h3 {
    font-size: 1.05rem;
    color: var(--text);
    margin-bottom: 12px;
}

.expertise-card p {
    font-size: 0.85rem;
    line-height: 1.75;
    margin-bottom: 24px;
    max-width: none;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.tag {
    display: inline-block;
    padding: 3px 9px;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(34, 211, 238, 0.14);
    border-radius: 3px;
    font-size: 0.68rem;
    letter-spacing: 0.04em;
}

/* ===========================
   Projects
   =========================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.project-card {
    padding: 26px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    transition: border-color 280ms ease, transform 280ms ease, box-shadow 280ms ease;
}

.project-card:hover {
    border-color: rgba(34, 211, 238, 0.2);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.placeholder-card { opacity: 0.45; }

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.project-number {
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.1em;
}

.project-links { display: flex; gap: 12px; }

.icon-link {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    display: flex;
    transition: color var(--transition);
}
.icon-link:hover { color: var(--accent); }
.icon-link svg { width: 100%; height: 100%; }

.project-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 10px;
}

.project-desc {
    font-size: 0.84rem;
    flex: 1;
    margin-bottom: 20px;
    max-width: none;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: auto;
}

/* ===========================
   Publications
   =========================== */
.pub-section { margin-bottom: 52px; }
.pub-section:last-child { margin-bottom: 0; }

.pub-category {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    letter-spacing: 0.04em;
}

.pub-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pub-card {
    padding: 24px 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}

.pub-card:hover { border-color: rgba(34, 211, 238, 0.2); }

.pub-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 8px;
}

.pub-id { font-size: 0.72rem; letter-spacing: 0.06em; }

.pub-date {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.06em;
}

.pub-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.pub-desc {
    font-size: 0.84rem;
    max-width: none;
    margin-bottom: 14px;
}

.pub-link {
    font-size: 0.72rem;
    color: var(--accent);
    letter-spacing: 0.06em;
    transition: opacity var(--transition);
    display: inline-block;
}
.pub-link:hover { opacity: 0.65; }

.pub-desc code {
    font-family: var(--font-mono);
    font-size: 0.8em;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 1px 5px;
    border-radius: 3px;
}

/* ===========================
   Footer
   =========================== */
.footer {
    padding: 36px 0;
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    flex-wrap: wrap;
    gap: 14px;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.footer-name {
    font-size: 0.825rem;
    color: var(--text);
}

.footer-sep { color: var(--text-dim); }

.footer-role {
    font-size: 0.825rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 22px;
}

.footer-links a {
    font-size: 0.825rem;
    color: var(--text-muted);
    transition: color var(--transition);
}
.footer-links a:hover { color: var(--accent); }

.footer-copy {
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: 0.06em;
}

/* ===========================
   Scroll Reveal
   =========================== */
.reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ===========================
   Keyframes
   =========================== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    to { opacity: 1; }
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50%       { opacity: 0.3; transform: scaleY(0.6); }
}

@keyframes glitch-top {
    0%   { opacity: 0; transform: none; }
    8%   { opacity: 0.75; transform: translate(-4px, 0) skewX(-2deg); }
    12%  { opacity: 0; transform: translate(4px, 0); }
    16%  { opacity: 0.5; transform: translate(-2px, 0); }
    20%  { opacity: 0; }
    100% { opacity: 0; }
}

@keyframes glitch-bot {
    0%   { opacity: 0; transform: none; }
    10%  { opacity: 0.75; transform: translate(4px, 0) skewX(2deg); }
    14%  { opacity: 0; transform: translate(-4px, 0); }
    18%  { opacity: 0.5; transform: translate(2px, 0); }
    22%  { opacity: 0; }
    100% { opacity: 0; }
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 900px) {
    :root { --pad: 72px; }

    .about-grid { grid-template-columns: 1fr; gap: 48px; }
    .expertise-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    :root { --pad: 56px; }

    .container { padding: 0 20px; }
    .nav-inner { padding: 0 20px; }
    .nav-links { display: none; }
    .hamburger { display: flex; }

    .hero-content { padding: 0 20px; padding-top: 80px; }
    .hero-cta { flex-direction: column; align-items: flex-start; }

    .footer-inner { flex-direction: column; align-items: flex-start; }
    .footer-links { gap: 16px; }
}