:root {
    --primary: #0A1628;
    --accent: #00BFA6;
    --accent-light: #00E5CC;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --bg: #F8FFFE;
    --white: #ffffff;
    --border: #e0f0ed;
    --card-shadow: 0 4px 28px rgba(0,191,166,0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.75;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 600;
    line-height: 1.3;
}

/* ===== Navigation ===== */
.nav {
    position: fixed; top: 0; left: 0; right: 0;
    z-index: 1000; padding: 1rem 2rem;
    transition: var(--transition); background: transparent;
}
.nav.scrolled {
    background: rgba(248,255,254,0.92);
    backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
    box-shadow: 0 1px 24px rgba(10,22,40,0.08);
}
.nav-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center;
}
.nav-logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem; font-weight: 700;
    color: var(--white); text-decoration: none;
    transition: var(--transition);
}
.nav.scrolled .nav-logo { color: var(--primary); }

.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
    text-decoration: none; color: rgba(255,255,255,0.85);
    font-size: 0.875rem; font-weight: 500;
    letter-spacing: 0.02em; transition: var(--transition);
    position: relative;
}
.nav.scrolled .nav-links a { color: var(--text); }
.nav-links a:hover { color: var(--accent-light); }
.nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--accent);
    transition: var(--transition);
}
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    cursor: pointer; background: none; border: none; padding: 4px;
}
.nav-toggle span {
    width: 24px; height: 2px; background: var(--white);
    transition: var(--transition);
}
.nav.scrolled .nav-toggle span { background: var(--primary); }

/* ===== Hero ===== */
.hero {
    min-height: 100vh; display: flex;
    align-items: center; justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #0A1628 0%, #1A2744 50%, #0D3B66 100%);
    overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(0,191,166,0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0,229,204,0.08) 0%, transparent 50%);
}
.hero-particles {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0; overflow: hidden;
}
.particle {
    position: absolute; width: 2px; height: 2px;
    background: rgba(0,229,204,0.4); border-radius: 50%;
    animation: float-particle linear infinite;
}
@keyframes float-particle {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-10vh) rotate(720deg); opacity: 0; }
}
.hero-content {
    position: relative; z-index: 1; text-align: center;
    color: var(--white); padding: 2rem; max-width: 800px;
}
.hero-badge {
    display: inline-block; padding: 0.5rem 1.5rem;
    border: 1px solid rgba(0,191,166,0.3); border-radius: 50px;
    font-size: 0.8rem; font-weight: 500;
    letter-spacing: 0.15em; text-transform: uppercase;
    margin-bottom: 2.5rem; backdrop-filter: blur(10px);
    background: rgba(0,191,166,0.08);
}
.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    margin-bottom: 1.25rem; font-weight: 700; letter-spacing: -0.02em;
}
.hero h1 .accent { color: var(--accent-light); }
.hero-subtitle {
    font-size: 1.15rem; font-weight: 300;
    color: rgba(255,255,255,0.7); margin-bottom: 0.5rem;
}
.hero-affiliation {
    font-size: 0.95rem; color: rgba(255,255,255,0.5);
    margin-bottom: 3rem;
}
.hero-stats { display: flex; justify-content: center; gap: 3.5rem; margin-top: 3.5rem; }
.hero-stat { text-align: center; }
.hero-stat-number {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem; font-weight: 700;
    color: var(--accent-light); display: block;
}
.hero-stat-label {
    font-size: 0.75rem; text-transform: uppercase;
    letter-spacing: 0.1em; color: rgba(255,255,255,0.5); margin-top: 0.25rem;
}
.scroll-indicator {
    position: absolute; bottom: 2rem; left: 50%;
    transform: translateX(-50%); z-index: 1;
}
.scroll-indicator .mouse {
    width: 24px; height: 38px;
    border: 2px solid rgba(0,191,166,0.4); border-radius: 12px;
    position: relative;
}
.scroll-indicator .wheel {
    width: 3px; height: 8px; background: rgba(0,229,204,0.6);
    border-radius: 2px; position: absolute; top: 6px;
    left: 50%; transform: translateX(-50%);
    animation: scroll-wheel 2s ease-in-out infinite;
}
@keyframes scroll-wheel {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.3; transform: translateX(-50%) translateY(12px); }
}

/* ===== Section Base ===== */
.section { padding: 7rem 2rem; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-header { margin-bottom: 4.5rem; }
.section-label {
    font-size: 0.75rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.15em;
    color: var(--accent); margin-bottom: 0.75rem; display: block;
}
.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    color: var(--primary); margin-bottom: 1.25rem;
}
.section-desc {
    font-size: 1.05rem; color: var(--text-light);
    max-width: 600px; line-height: 1.8;
}

/* ===== About ===== */
.about { background: var(--white); }
.about-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 4.5rem; align-items: start;
}
.about-text p { margin-bottom: 1.5rem; color: var(--text); font-size: 1.025rem; }
.about-photos {
    display: flex; gap: 1rem; margin-bottom: 1.5rem;
}
.about-photo-profile {
    width: 140px; height: 180px; object-fit: cover; object-position: top;
    border-radius: 12px; box-shadow: var(--card-shadow);
}
.about-photo-lecture {
    flex: 1; height: 180px; object-fit: cover;
    border-radius: 12px; box-shadow: var(--card-shadow);
}.about-info { display: grid; gap: 1.75rem; }
.info-card {
    padding: 1.75rem; background: rgba(248,255,254,0.6);
    border-radius: 16px; transition: var(--transition);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0,191,166,0.1);
}
.info-card:hover {
    transform: translateY(-2px); box-shadow: var(--card-shadow);
    background: rgba(248,255,254,0.85);
}
.info-card-label {
    font-size: 0.7rem; text-transform: uppercase;
    letter-spacing: 0.12em; color: var(--text-light); margin-bottom: 0.4rem;
}
.info-card-value { font-weight: 600; color: var(--primary); font-size: 0.95rem; }
.info-card-sub { font-size: 0.85rem; color: var(--text-light); margin-top: 0.2rem; }

/* ===== Education Timeline ===== */
.education { background: var(--bg); }
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0;
    width: 2px; background: linear-gradient(to bottom, var(--accent), var(--border));
}
.timeline-item { position: relative; padding: 0 0 3.5rem 2rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
    content: ''; position: absolute; left: -2rem; top: 0.5rem;
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--accent); border: 3px solid var(--bg);
    transform: translateX(-4px);
}
.timeline-date {
    font-size: 0.8rem; color: var(--accent); font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem;
}
.timeline-title {
    font-family: 'Inter', sans-serif; font-size: 1.1rem;
    font-weight: 600; color: var(--primary); margin-bottom: 0.25rem;
}
.timeline-sub { font-size: 0.9rem; color: var(--text-light); }
.timeline-location { font-size: 0.8rem; color: var(--text-light); font-style: italic; }

/* ===== Research ===== */
.research { background: var(--white); }
.research-areas { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.25rem; }
.research-card {
    padding: 2.75rem 2rem; background: var(--bg); border-radius: 16px;
    transition: var(--transition); position: relative; overflow: hidden;
    border-left: 3px solid var(--accent);
}
.research-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 3px; background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0); transform-origin: left; transition: var(--transition);
}
.research-card:hover::before { transform: scaleX(1); }
.research-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow); }
.research-icon {
    width: 48px; height: 48px; border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1.75rem; font-size: 1.25rem; color: var(--white);
}
.research-card h3 {
    font-family: 'Inter', sans-serif; font-size: 1.05rem;
    font-weight: 600; color: var(--primary); margin-bottom: 0.75rem;
}
.research-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.7; }

/* ===== Grants ===== */
.grants-grid { display: grid; gap: 1.25rem; }
.grant-item {
    display: grid; grid-template-columns: 1fr auto; gap: 2rem;
    padding: 1.75rem 2rem; background: var(--white);
    border-radius: 12px; align-items: center; transition: var(--transition);
}
.grant-item:hover { box-shadow: var(--card-shadow); transform: translateX(4px); }
.grant-title { font-weight: 600; font-size: 0.95rem; color: var(--primary); margin-bottom: 0.3rem; }
.grant-agency { font-size: 0.8rem; color: var(--text-light); text-transform: uppercase; letter-spacing: 0.04em; }
.grant-period { font-size: 0.8rem; color: var(--accent); font-weight: 600; white-space: nowrap; }
.grants-section { margin-top: 4.5rem; }
.grants-subtitle {
    font-family: 'Inter', sans-serif; font-size: 1.1rem;
    font-weight: 600; color: var(--primary); margin-bottom: 1.75rem;
}

/* ===== Awards ===== */
.awards { background: var(--primary); color: var(--white); }
.awards .section-label { color: var(--accent-light); }
.awards .section-title { color: var(--white); }
.awards .section-desc { color: rgba(255,255,255,0.6); }
.awards-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.75rem; }
.award-card {
    padding: 2.25rem; background: rgba(255,255,255,0.04);
    border: 1px solid rgba(0,191,166,0.12);
    border-radius: 16px; transition: var(--transition);
}
.award-card:hover { background: rgba(0,191,166,0.06); transform: translateY(-2px); }
.award-card.featured { background: rgba(0,191,166,0.1); border-color: rgba(0,191,166,0.3); }
.award-year {
    font-size: 0.75rem; color: var(--accent-light); font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.08em;
}
.award-title {
    font-family: 'Inter', sans-serif; font-weight: 600;
    font-size: 1rem; color: var(--white); margin: 0.5rem 0 0.3rem;
}
.award-org { font-size: 0.825rem; color: rgba(255,255,255,0.5); }

/* ===== Publications ===== */
.publications { background: var(--white); }
.pub-filters { display: flex; gap: 0.75rem; margin-bottom: 2.75rem; flex-wrap: wrap; }
.pub-filter {
    padding: 0.5rem 1.25rem; border: 1px solid var(--border);
    border-radius: 50px; font-size: 0.825rem; font-weight: 500;
    cursor: pointer; transition: var(--transition);
    background: var(--white); color: var(--text-light);
}
.pub-filter:hover, .pub-filter.active {
    background: var(--primary); color: var(--white); border-color: var(--primary);
}
.pub-list {
    display: grid; gap: 1px; background: var(--border);
    border-radius: 12px; overflow: hidden;
}
.pub-item {
    display: grid; grid-template-columns: 1fr auto; gap: 1.5rem;
    padding: 1.5rem 1.75rem; background: var(--white);
    align-items: center; transition: var(--transition);
}
.pub-item:hover { background: var(--bg); }
.pub-journal {
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--accent); margin-bottom: 0.2rem;
}
.pub-title-text { font-size: 0.9rem; color: var(--primary); font-weight: 500; line-height: 1.5; }
.pub-meta { display: flex; align-items: center; gap: 1rem; }
.pub-role {
    font-size: 0.7rem; padding: 0.25rem 0.7rem; border-radius: 50px;
    font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em;
}
.pub-role.first { background: rgba(0,191,166,0.12); color: #00BFA6; }
.pub-role.corresponding { background: rgba(59,130,246,0.1); color: #3B82F6; }
.pub-role.co-author { background: rgba(127,140,141,0.1); color: var(--text-light); }
.pub-date { font-size: 0.8rem; color: var(--text-light); font-weight: 500; white-space: nowrap; }

/* ===== Teaching ===== */
.teaching { background: var(--bg); }
.teaching-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2.25rem; }
.teaching-card {
    padding: 2.25rem; background: var(--white); border-radius: 16px;
    transition: var(--transition); border-left: 4px solid var(--accent);
}
.teaching-card:hover { box-shadow: var(--card-shadow); }
.teaching-code {
    font-size: 0.75rem; font-weight: 700; color: var(--accent);
    text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.5rem;
}
.teaching-name {
    font-family: 'Inter', sans-serif; font-size: 1.05rem;
    font-weight: 600; color: var(--primary); margin-bottom: 0.5rem;
}
.teaching-program {
    display: inline-block; padding: 0.25rem 0.75rem;
    background: rgba(0,191,166,0.08); border-radius: 50px;
    font-size: 0.75rem; color: var(--accent);
    font-weight: 600; margin-bottom: 0.75rem;
}
.teaching-desc { font-size: 0.875rem; color: var(--text-light); line-height: 1.7; }
.teaching-year { margin-top: 0.75rem; font-size: 0.8rem; color: var(--text-light); font-weight: 500; }

/* ===== Lab Members ===== */
.lab { background: var(--white); }
.lab-grid {
    display: grid; grid-template-columns: repeat(5, 1fr); gap: 1.75rem;
}
.lab-card {
    text-align: center; padding: 2.25rem 1rem; background: var(--bg);
    border-radius: 16px; transition: var(--transition);
}
.lab-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow); }
.lab-card-director {
    background: linear-gradient(135deg, var(--primary), #1A2744);
    color: var(--white);
}
.lab-card-director .lab-name { color: var(--white); }
.lab-card-director .lab-role { color: rgba(255,255,255,0.6); }
.lab-card-director .lab-avatar img {
    width: 100%; height: 100%; object-fit: cover;
}
.lab-avatar { background: rgba(0,191,166,0.15); color: rgba(0,229,204,0.8); }
.lab-avatar img {
    width: 100%; height: 100%; object-fit: cover;
}
.lab-avatar {
    width: 80px; height: 80px; overflow: hidden; border-radius: 50%;
    background: var(--border); color: var(--text-light);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1rem;
}
.lab-name {
    font-family: 'Inter', sans-serif; font-weight: 600;
    font-size: 0.95rem; color: var(--primary); margin-bottom: 0.25rem;
}
.lab-role { font-size: 0.8rem; color: var(--text-light); }

/* ===== Contact ===== */
.contact { background: var(--white); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4.5rem; }
.contact-info { display: grid; gap: 2.25rem; }
.contact-item { display: flex; gap: 1rem; align-items: flex-start; }
.contact-icon {
    width: 44px; height: 44px; border-radius: 12px; background: var(--bg);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; font-size: 1.1rem;
}
.contact-label {
    font-size: 0.75rem; text-transform: uppercase;
    letter-spacing: 0.1em; color: var(--text-light); margin-bottom: 0.2rem;
}
.contact-value { font-weight: 600; color: var(--primary); font-size: 0.95rem; }
.contact-value a { color: var(--primary); text-decoration: none; transition: var(--transition); }
.contact-value a:hover { color: var(--accent); }
.contact-map {
    border-radius: 16px; overflow: hidden;
    height: 100%; min-height: 300px; background: var(--bg);
}
.contact-map iframe { width: 100%; height: 100%; border: none; border-radius: 16px; }

/* ===== Footer ===== */
.footer {
    background: var(--primary); color: rgba(255,255,255,0.5);
    padding: 3.5rem 2rem; text-align: center;
}
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer p { font-size: 0.85rem; }
.footer a { color: rgba(0,229,204,0.7); text-decoration: none; transition: var(--transition); }
.footer a:hover { color: var(--accent-light); }

/* ===== Animations ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed; bottom: 2rem; right: 2rem;
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--primary); color: var(--white);
    border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; opacity: 0; transform: translateY(20px);
    transition: var(--transition); z-index: 999;
    box-shadow: 0 4px 14px rgba(10,22,40,0.25);
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .nav-links {
        position: fixed; top: 0; right: -100%;
        width: 280px; height: 100vh; background: var(--primary);
        flex-direction: column; padding: 5rem 2rem;
        transition: var(--transition); gap: 1.5rem;
    }
    .nav-links.open { right: 0; }
    .nav-links a { color: rgba(255,255,255,0.85) !important; font-size: 1rem; }
    .nav-toggle { display: flex; z-index: 1001; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
    .research-areas { grid-template-columns: 1fr; }
    .awards-grid { grid-template-columns: 1fr; }
    .teaching-grid { grid-template-columns: 1fr; }
    .lab-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-stats { gap: 2rem; }
    .hero-stat-number { font-size: 2rem; }
    .pub-item { grid-template-columns: 1fr; gap: 0.75rem; }
    .pub-meta { justify-content: flex-start; }
    .grant-item { grid-template-columns: 1fr; gap: 0.5rem; }
}

@media (max-width: 600px) {
    .section { padding: 4.5rem 1.25rem; }
    .hero-stats { flex-direction: column; gap: 1.5rem; }
    .lab-grid { grid-template-columns: 1fr; }
}