/* =============================================
   CSP Lab — v3: Refined Academic, Logo-Driven
   Navy (#1a1a6e) + Orange (#e8943a) + Warm Neutrals
   ============================================= */

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

:root {
    --navy: #1a1a6e;
    --navy-dark: #12124e;
    --navy-light: #2e2e8f;
    --orange: #e8943a;
    --orange-soft: #f0a855;
    --cream: #f5f0eb;
    --cream-dark: #ece5dd;
    --white: #ffffff;
    --text: #2c2c2c;
    --text-light: #555;
    --text-muted: #888;
    --border: #ddd;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1060px;
    --transition: 0.25s ease;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.75;
    color: var(--text);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--navy); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--orange); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }

/* ---- Navbar ---- */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--max-width); margin: 0 auto; padding: 0 2rem;
    display: flex; align-items: center; justify-content: space-between; height: 60px;
}

.nav-logo { display: flex; flex-direction: column; align-items: center; gap: 0.05rem; }
.nav-logo-img { height: 28px; width: auto; }
.nav-logo-text { font-weight: 700; font-size: 0.6rem; color: var(--navy); letter-spacing: 0.2em; text-transform: uppercase; }

.nav-menu { display: flex; list-style: none; gap: 0; }
.nav-menu a {
    display: block; padding: 0.5rem 0.85rem;
    color: var(--text-light); font-size: 0.82rem; font-weight: 500;
    letter-spacing: 0.08em; text-transform: uppercase;
    transition: color var(--transition);
}
.nav-menu a:hover { color: var(--orange); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy); margin: 5px 0; transition: var(--transition); border-radius: 1px; }

/* ---- Hero ---- */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    text-align: center;
    background: var(--cream);
    padding: 6rem 2rem 4rem;
}

.hero-inner { max-width: 640px; }

.hero-logo { width: 220px; margin: 0 auto 2.5rem; }

.hero-tagline {
    font-family: var(--font);
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--text-light);
    line-height: 1.65;
    font-style: italic;
}

.hero-arrow {
    display: inline-block; margin-top: 3rem;
    color: var(--navy); font-size: 1.1rem; opacity: 0.4;
    transition: opacity var(--transition);
    animation: bounce 2s infinite;
}
.hero-arrow:hover { opacity: 0.8; color: var(--navy); }

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

/* ---- Sections ---- */
.section { padding: 5rem 0; }
.section-tinted { background: var(--cream); }
.section-dark { background: var(--navy); color: var(--white); }
.section-dark a { color: var(--orange-soft); }
.section-dark a:hover { color: var(--white); }

.section-title {
    font-family: var(--font);
    font-size: 1.9rem; font-weight: 600;
    color: var(--navy);
    margin-bottom: 1.25rem;
    text-align: center;
    letter-spacing: -0.02em;
    line-height: 1.2;
}
.section-dark .section-title { color: var(--white); }

.section-intro {
    text-align: center;
    color: var(--text-light);
    font-size: 1.05rem;
    line-height: 1.85;
    max-width: 600px; margin: 0 auto 2.5rem;
}

/* ---- About ---- */
.about-block {
    max-width: 720px; margin: 0 auto;
    text-align: center;
}
.about-lead {
    font-family: var(--font);
    font-size: 1.6rem; font-weight: 500;
    color: var(--navy);
    line-height: 1.45;
    margin-bottom: 1.25rem;
}
.about-block p { font-size: 1.05rem; color: var(--text-light); line-height: 1.85; }
.about-block p + p { margin-top: 1rem; }

/* ---- Research ---- */
.research-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.research-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 1px 6px rgba(0,0,0,0.04);
    transition: border-color var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}
.research-card:hover {
    border-color: var(--orange);
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.research-card h3 {
    font-family: var(--font);
    font-size: 1.2rem; font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.6rem;
}
.research-icon {
    color: var(--orange);
    font-size: 1.05rem;
    margin-right: 0.25rem;
}

.research-card p { font-size: 0.93rem; color: var(--text-light); line-height: 1.7; }

.research-papers {
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

details.research-papers summary {
    cursor: pointer;
    user-select: none;
    list-style: none;
}
details.research-papers summary::-webkit-details-marker { display: none; }
details.research-papers summary::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.6rem;
    margin-left: 0.5rem;
    color: var(--orange);
    transition: transform var(--transition);
    display: inline-block;
}
details[open].research-papers summary::after {
    transform: rotate(180deg);
}

details.research-papers ul,
details.research-papers > p {
    animation: fadeIn 0.2s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.research-papers-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--navy);
    margin-bottom: 0.5rem;
}

.research-papers-coming-soon {
    font-style: italic;
    text-transform: none;
    letter-spacing: 0;
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.research-papers-coming-soon i {
    color: var(--orange);
    margin-right: 0.3rem;
}

.research-papers ul {
    list-style: none;
    padding: 0;
}

.research-papers li {
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.6;
    padding: 0.35rem 0;
}
.research-papers li + li {
    border-top: 1px dashed rgba(0,0,0,0.06);
    padding-top: 0.5rem;
}
.research-papers li em {
    color: var(--text-muted);
}

.methods-card-wrap {
    display: flex; justify-content: center; margin-top: 1.75rem;
}
.methods-card { max-width: 600px; text-align: center; }

.methods-note {
    max-width: 700px; margin: 0 auto;
    text-align: center;
    font-size: 0.95rem; color: var(--text-light);
    padding: 1.5rem 2rem;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 1px 6px rgba(0,0,0,0.04);
}
.methods-note strong { color: var(--navy); }

/* ---- People ---- */
.group-photo-wrap {
    margin: 0 auto 2.5rem;
    max-width: 800px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}
.group-photo-wrap img { width: 100%; display: block; }
.photo-credit { text-align: right; font-size: 0.75rem; color: var(--text-muted); padding: 0.4rem 0.8rem; }

.person-bio {
    display: flex; gap: 2.5rem;
    align-items: flex-start;
    margin-bottom: 3rem;
    padding: 2.5rem;
    background: var(--cream);
    border-radius: 10px;
}

.person-bio-photo {
    flex-shrink: 0;
    width: 160px; height: 160px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--cream-dark);
}
.person-bio-photo img { width: 100%; height: 100%; object-fit: cover; }

.person-bio-text h3 {
    font-family: var(--font);
    font-size: 1.4rem; font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.2rem;
}
.person-role-label { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.75rem; }
.person-bio-text p { font-size: 0.95rem; color: var(--text-light); line-height: 1.85; }

.person-icons { display: flex; gap: 0.85rem; margin-top: 1rem; }
.person-icons a {
    color: var(--navy); font-size: 1.1rem;
    opacity: 0.6; transition: opacity var(--transition), color var(--transition);
}
.person-icons a:hover { opacity: 1; color: var(--orange); }

.group-label {
    font-size: 0.8rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.12em;
    color: var(--navy);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--orange);
    display: inline-block;
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.75rem;
    margin-bottom: 3rem;
}

.person-card { text-align: center; }
.person-photo {
    width: 110px; height: 110px;
    border-radius: 50%; overflow: hidden;
    margin: 0 auto 0.75rem;
    background: var(--cream);
    border: 2px solid var(--border);
}
.person-photo img { width: 100%; height: 100%; object-fit: cover; }

.person-card h4 {
    font-family: var(--font);
    font-size: 1.05rem; font-weight: 600;
    color: var(--text); margin-bottom: 0.15rem;
}
.person-card p { font-size: 0.85rem; color: var(--text-muted); }
.person-card-icons { display: flex; gap: 0.6rem; justify-content: center; margin-top: 0.5rem; }
.person-card-icons a {
    color: var(--navy); font-size: 0.85rem;
    opacity: 0.5; transition: opacity var(--transition), color var(--transition);
}
.person-card-icons a:hover { opacity: 1; color: var(--orange); }
.person-alumni { opacity: 0.7; }

/* ---- Publications ---- */
.pub-list { max-width: 780px; margin: 0 auto; }
.pub-year-label { font-size: 1.15rem; font-weight: 600; color: var(--navy); margin-top: 2rem; margin-bottom: 0.5rem; }
.pub-year-label:first-child { margin-top: 0; }
.pub-entry {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}
.pub-entry:last-child { border-bottom: none; }
.pub-entry p { font-size: 0.93rem; color: var(--text); line-height: 1.65; }
.pub-link { color: var(--orange); font-size: 0.85rem; font-weight: 500; white-space: nowrap; }
.pub-entry em { color: var(--text-light); }

.pub-links {
    text-align: center; margin-top: 2rem;
    display: flex; gap: 2rem; justify-content: center;
}
.pub-links a { font-size: 0.9rem; font-weight: 500; color: var(--navy); }
.pub-links a:hover { color: var(--orange); }

/* ---- Join ---- */
.join-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.join-item {
    background: var(--cream);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 1px 6px rgba(0,0,0,0.04);
}
.join-item h4 {
    font-family: var(--font);
    font-size: 1.1rem; font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.6rem;
}
.join-item p { font-size: 0.93rem; color: var(--text-light); }

.join-cta { text-align: center; font-size: 1rem; color: var(--text-light); }
.join-cta a { color: var(--navy); font-weight: 500; }

/* ---- Contact ---- */
.contact-grid {
    display: flex; justify-content: space-between; align-items: center;
    max-width: 600px; margin: 0 auto;
}
.contact-block p { font-size: 0.95rem; margin-bottom: 0.5rem; color: rgba(255,255,255,0.85); }
.contact-block a { color: var(--orange-soft); }

.social-row { display: flex; gap: 1.25rem; }
.social-row a {
    color: rgba(255,255,255,0.6); font-size: 1.3rem;
    transition: color var(--transition);
}
.social-row a:hover { color: var(--orange-soft); }

/* ---- Footer ---- */
.footer {
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
}
.footer-logo { height: 36px; margin: 0 auto 0.75rem; opacity: 0.5; }
.footer p { color: var(--text-muted); font-size: 0.82rem; }
.footer-credit { font-size: 0.75rem; color: var(--text-muted); opacity: 0.7; margin-top: 0.25rem; }

/* ---- Publications Page ---- */
.page-header {
    padding: 8rem 2rem 3rem;
    text-align: center;
    background: var(--cream);
    border-bottom: 1px solid var(--border);
}
.page-header h1 { font-family: var(--font); font-size: 2rem; font-weight: 600; color: var(--navy); margin-bottom: 0.25rem; }
.page-header p { color: var(--text-muted); font-size: 0.95rem; }
.page-header a { display: inline-block; margin-top: 0.75rem; font-size: 0.85rem; color: var(--navy); }

.pub-page-list { max-width: 780px; margin: 0 auto; padding: 2rem; }
.pub-page-year {
    font-family: var(--font); font-size: 1.5rem; font-weight: 600;
    color: var(--navy); margin: 2.5rem 0 0.75rem;
    padding-bottom: 0.3rem;
    border-bottom: 2px solid var(--orange);
    display: inline-block;
}
.pub-page-year:first-of-type { margin-top: 1rem; }
.pub-page-item { padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.pub-page-item:last-of-type { border-bottom: none; }
.pub-page-text { font-size: 0.93rem; color: var(--text); line-height: 1.65; }
.pub-page-text em { color: var(--text-light); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-menu {
        position: fixed; top: 0; right: -100%; width: 260px; height: 100vh;
        background: var(--white); flex-direction: column;
        padding: 5rem 2rem 2rem; box-shadow: -4px 0 20px rgba(0,0,0,0.06);
        transition: right 0.25s ease;
    }
    .nav-menu.active { right: 0; }
    .nav-menu a { padding: 0.75rem 0; font-size: 0.95rem; text-transform: none; letter-spacing: 0; color: var(--text); }

    .hero { min-height: auto; padding: 8rem 1.5rem 4rem; }
    .hero-logo { width: 160px; }

    .research-grid { grid-template-columns: 1fr; }
    .person-bio { flex-direction: column; align-items: center; text-align: center; }
    .person-icons { justify-content: center; }
    .join-grid { grid-template-columns: 1fr; }
    .contact-grid { flex-direction: column; gap: 1.5rem; text-align: center; }
    .social-row { justify-content: center; }
}