/* ─────────────────────────────────────────────
   Design System — Medical AI · Dark + Teal
───────────────────────────────────────────── */
:root {
    --bg:          #040e1a;
    --bg-raised:   #071828;
    --bg-card:     #0a1e30;
    --bg-card-alt: #0d2238;
    --teal:        #00d4b0;
    --teal-dim:    #00a88a;
    --teal-glow:   rgba(0, 212, 176, 0.18);
    --teal-border: rgba(0, 212, 176, 0.25);
    --cyan:        #38bdf8;
    --text:        #dde6ef;
    --text-muted:  #7a9baf;
    --text-faint:  #3d5a6c;
    --border:      rgba(255,255,255,0.07);
    --gradient:    linear-gradient(135deg, #00d4b0 0%, #38bdf8 100%);
    --shadow-teal: 0 0 32px rgba(0, 212, 176, 0.12);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.45);
    --radius:      0.75rem;
    --transition:  all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    --font-xs:   0.72rem;
    --font-sm:   0.875rem;
    --font-base: 1rem;
    --font-lg:   1.125rem;
    --font-xl:   1.25rem;
    --font-2xl:  1.5rem;
    --font-3xl:  1.875rem;
    --font-4xl:  2.25rem;
    --font-5xl:  3rem;
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
}

/* ── Utility ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.75rem; }
@media (max-width: 768px) { .container { padding: 0 1.1rem; } }

/* ── Medical scan grid pattern ── */
.scan-grid-bg {
    background-image:
        linear-gradient(rgba(0,212,176,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,176,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
}

/* ── Buttons ── */
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.75rem 1.6rem;
    font-size: var(--font-base); font-weight: 600;
    text-decoration: none; border-radius: 0.5rem;
    border: none; cursor: pointer;
    transition: var(--transition); white-space: nowrap;
    letter-spacing: 0.01em;
}
.btn-primary {
    background: var(--teal); color: var(--bg);
    box-shadow: 0 0 20px rgba(0,212,176,0.3);
}
.btn-primary:hover {
    background: #00ffe8;
    box-shadow: 0 0 32px rgba(0,212,176,0.55);
    transform: translateY(-2px);
}
.btn-secondary {
    background: transparent; color: var(--teal);
    border: 1.5px solid var(--teal-border);
}
.btn-secondary:hover {
    background: var(--teal-glow);
    border-color: var(--teal);
    transform: translateY(-2px);
}

/* ── Navigation ── */
.nav {
    position: fixed; top: 0; left: 0; right: 0;
    background: rgba(4, 14, 26, 0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}
.nav-container {
    max-width: 1200px; margin: 0 auto;
    padding: 0 1.75rem;
    display: flex; align-items: center;
    justify-content: space-between;
    height: 3.75rem;
}
.nav-logo {
    font-size: var(--font-xl); font-weight: 700;
    color: var(--teal); letter-spacing: -0.02em;
}
.nav-menu { display: flex; gap: 1.75rem; align-items: center; }
.nav-link {
    color: var(--text-muted); text-decoration: none;
    font-size: var(--font-sm); font-weight: 500;
    transition: var(--transition); position: relative;
    letter-spacing: 0.02em;
}
.nav-link:hover { color: var(--teal); }
.nav-link::after {
    content: ''; position: absolute; bottom: -0.4rem; left: 0;
    width: 0; height: 1.5px; background: var(--teal);
    transition: var(--transition);
}
.nav-link:hover::after { width: 100%; }

/* Course link as pill */
.nav-link-course {
    color: var(--teal) !important;
    border: 1px solid var(--teal-border);
    padding: 0.3rem 0.85rem;
    border-radius: 2rem;
    font-size: var(--font-xs);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}
.nav-link-course::after { display: none; }
.nav-link-course:hover {
    background: var(--teal-glow);
    box-shadow: 0 0 12px rgba(0,212,176,0.2);
}

.nav-toggle { display: none; flex-direction: column; cursor: pointer; gap: 0.3rem; background: none; border: none; }
.bar { width: 1.4rem; height: 1.5px; background: var(--text-muted); transition: var(--transition); }

@media (max-width: 768px) {
    .nav-menu {
        position: fixed; top: 3.75rem; left: -100%; width: 100%;
        height: calc(100vh - 3.75rem);
        background: rgba(4, 14, 26, 0.97);
        backdrop-filter: blur(16px);
        flex-direction: column; align-items: center; justify-content: flex-start;
        padding-top: 2.5rem; gap: 1.5rem;
        transition: var(--transition);
    }
    .nav-menu.active { left: 0; }
    .nav-toggle { display: flex; }
    .nav-link { font-size: var(--font-base); }
    .nav-toggle.active .bar:nth-child(1) { transform: rotate(45deg) translate(0.32rem, 0.32rem); }
    .nav-toggle.active .bar:nth-child(2) { opacity: 0; }
    .nav-toggle.active .bar:nth-child(3) { transform: rotate(-45deg) translate(0.32rem, -0.32rem); }
}

/* ── Hero ── */
.hero {
    min-height: 100vh;
    background: var(--bg);
    display: flex; align-items: center;
    position: relative; overflow: hidden;
    padding-top: 3.75rem;
}

/* Scan grid */
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(0,212,176,0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,176,0.035) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}

/* Radial glow in corner */
.hero::after {
    content: '';
    position: absolute; top: -20%; right: -10%;
    width: 70%; padding-top: 70%;
    border-radius: 50%;
    background: radial-gradient(ellipse at center,
        rgba(0,212,176,0.07) 0%,
        rgba(56,189,248,0.04) 40%,
        transparent 70%);
    pointer-events: none;
}

/* Scan line animation */
.scan-line {
    position: absolute; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(0,212,176,0.5) 30%, rgba(0,212,176,0.8) 50%, rgba(0,212,176,0.5) 70%, transparent 100%);
    animation: scan 6s linear infinite;
    pointer-events: none;
    z-index: 1;
}
@keyframes scan {
    0%   { top: 0%; opacity: 0; }
    5%   { opacity: 1; }
    95%  { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

.hero-container {
    width: 100%; max-width: 1200px; margin: 0 auto;
    padding: 0 1.75rem; position: relative; z-index: 2;
}
.hero-content {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 4rem; align-items: center; padding: 5rem 0;
}
.hero-text { animation: fadeInUp 0.9s ease-out both; }

/* Research badge */
.research-badge {
    display: inline-flex; align-items: center; gap: 0.5rem;
    background: rgba(0,212,176,0.08);
    border: 1px solid var(--teal-border);
    color: var(--teal); padding: 0.3rem 0.9rem;
    border-radius: 2rem; font-size: var(--font-xs);
    font-weight: 700; letter-spacing: 0.08em;
    text-transform: uppercase; margin-bottom: 1.25rem;
}
.research-badge .blink {
    width: 0.4rem; height: 0.4rem; border-radius: 50%;
    background: var(--teal); animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.2; } }

.hero-title { margin-bottom: 1.25rem; }
.hero-name {
    display: block; font-size: var(--font-5xl); font-weight: 800;
    color: var(--text); letter-spacing: -0.03em; line-height: 1.05;
    margin-bottom: 0.5rem;
}
.hero-role {
    display: block; font-size: var(--font-xl); font-weight: 500;
    color: var(--teal); min-height: 2rem; font-family: 'Courier New', monospace;
    letter-spacing: 0.01em;
}
.hero-description {
    font-size: var(--font-lg); color: var(--text-muted);
    margin-bottom: 2rem; line-height: 1.75; max-width: 460px;
}

/* Readout stats in hero */
.hero-stats {
    display: flex; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 2rem;
}
.readout {
    display: flex; flex-direction: column;
    border-left: 2px solid var(--teal-border);
    padding-left: 0.75rem;
}
.readout-value {
    font-size: var(--font-xl); font-weight: 700; color: var(--teal);
    font-family: 'Courier New', monospace; line-height: 1;
}
.readout-label {
    font-size: var(--font-xs); color: var(--text-faint);
    text-transform: uppercase; letter-spacing: 0.07em; margin-top: 0.2rem;
}

.hero-buttons { display: flex; gap: 0.9rem; flex-wrap: wrap; }

/* Hero image side */
.hero-image {
    display: flex; justify-content: center; align-items: center;
    animation: fadeInRight 0.9s ease-out 0.3s both;
    position: relative;
}

/* MRI-like decorative ring behind photo */
.hero-image::before {
    content: '';
    position: absolute; inset: -24px;
    border-radius: 50%;
    border: 1px solid rgba(0,212,176,0.15);
    animation: rotate-ring 20s linear infinite;
}
.hero-image::after {
    content: '';
    position: absolute; inset: -48px;
    border-radius: 50%;
    border: 1px dashed rgba(0,212,176,0.08);
    animation: rotate-ring 32s linear infinite reverse;
}
@keyframes rotate-ring { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.image-container {
    position: relative; width: 360px; height: 360px;
    border-radius: 50%; overflow: hidden;
    border: 2px solid var(--teal-border);
    box-shadow: 0 0 0 8px rgba(0,212,176,0.05), var(--shadow-teal);
}
.profile-img {
    width: 100%; height: 100%; object-fit: cover;
    border-radius: 50%; transition: var(--transition);
    filter: none;
}
.image-overlay {
    position: absolute; inset: 0;
    background: var(--gradient); opacity: 0;
    transition: var(--transition); border-radius: 50%;
}
.image-container:hover .image-overlay { opacity: 0.08; }
.image-container:hover .profile-img { transform: scale(1.04); }

.scroll-indicator {
    position: absolute; bottom: 2rem; left: 50%;
    transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center;
    gap: 0.4rem; animation: bounce 2.5s ease-in-out infinite; z-index: 2;
}
.scroll-line { width: 1px; height: 2rem; background: var(--teal-border); }
.scroll-text {
    font-size: var(--font-xs); color: var(--text-faint);
    text-transform: uppercase; letter-spacing: 0.12em;
    font-family: 'Courier New', monospace;
}

@media (max-width: 768px) {
    .hero-content { grid-template-columns: 1fr; gap: 2.5rem; text-align: center; padding: 3.5rem 0; }
    .hero-name { font-size: var(--font-4xl); }
    .hero-description { max-width: 100%; }
    .image-container { width: 260px; height: 260px; }
    .hero-image::before, .hero-image::after { display: none; }
    .hero-buttons { justify-content: center; }
    .hero-stats { justify-content: center; }
}

/* ── Section base ── */
.section-label {
    display: inline-block;
    font-size: var(--font-xs); font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--teal); margin-bottom: 0.6rem;
    font-family: 'Courier New', monospace;
}
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-title {
    font-size: var(--font-4xl); font-weight: 800; margin-bottom: 0.75rem;
    letter-spacing: -0.03em; position: relative; display: inline-block;
    color: var(--text);
}
.section-title::after {
    content: ''; position: absolute; bottom: -0.5rem; left: 50%;
    transform: translateX(-50%);
    width: 2.5rem; height: 2px; background: var(--teal);
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(0,212,176,0.5);
}
.section-subtitle { font-size: var(--font-lg); color: var(--text-muted); }

/* ── About ── */
.about { padding: 6rem 0; background: var(--bg-raised); position: relative; }
.about::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 1px; background: var(--border);
}
.about-content { max-width: 820px; margin: 0 auto; }
.about-description {
    font-size: var(--font-lg); color: var(--text-muted);
    margin-bottom: 1.75rem; line-height: 1.8; text-align: justify;
}
.about-description a { color: var(--teal); text-decoration: none; font-weight: 500; }
.about-description a:hover { text-decoration: underline; }

/* Research focus tags */
.focus-tags {
    display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 2rem;
}
.focus-tag {
    background: rgba(0,212,176,0.07);
    border: 1px solid var(--teal-border);
    color: var(--teal); padding: 0.35rem 0.85rem;
    border-radius: 0.4rem; font-size: var(--font-xs);
    font-weight: 600; letter-spacing: 0.04em;
    text-transform: uppercase; transition: var(--transition);
}
.focus-tag:hover { background: var(--teal-glow); box-shadow: 0 0 10px rgba(0,212,176,0.2); }

/* ── Tech ── */
.tech { padding: 6rem 0; background: var(--bg); }
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}
.tech-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1.75rem; border-radius: var(--radius);
    transition: var(--transition);
}
.tech-category:hover {
    border-color: var(--teal-border);
    box-shadow: 0 0 24px rgba(0,212,176,0.08);
    transform: translateY(-3px);
}
.tech-title {
    font-size: var(--font-xs); font-weight: 700; margin-bottom: 1.5rem;
    text-align: center; color: var(--teal);
    text-transform: uppercase; letter-spacing: 0.1em;
    font-family: 'Courier New', monospace;
}
.tech-items { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
.tech-item {
    display: flex; flex-direction: column; align-items: center;
    gap: 0.4rem; padding: 0.85rem;
    background: rgba(255,255,255,0.025);
    border: 1px solid var(--border);
    border-radius: 0.5rem; transition: var(--transition); cursor: default;
}
.tech-item:hover {
    background: var(--teal-glow);
    border-color: var(--teal-border);
    box-shadow: 0 0 12px rgba(0,212,176,0.15);
}
.tech-item img {
    width: 2.25rem; height: 2.25rem;
    filter: brightness(0) saturate(100%) invert(70%) sepia(30%) saturate(400%) hue-rotate(150deg);
    transition: var(--transition);
}
.tech-item:hover img { filter: brightness(0) invert(1); }
.tech-item span { font-size: var(--font-xs); font-weight: 500; color: var(--text-muted); }
.tech-item:hover span { color: var(--text); }

/* ── Projects ── */
.projects { padding: 6rem 0; background: var(--bg-raised); }
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden;
    transition: var(--transition); cursor: pointer;
}
.project-card:hover {
    border-color: var(--teal-border);
    box-shadow: 0 0 32px rgba(0,212,176,0.10), var(--shadow-card);
    transform: translateY(-4px);
}
.project-image { position: relative; height: 200px; overflow: hidden; }
.project-image img {
    width: 100%; height: 100%; object-fit: cover;
    transition: var(--transition);
    filter: brightness(0.75) saturate(0.7);
}
.project-overlay {
    position: absolute; inset: 0;
    background: rgba(0,212,176,0.85);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; transition: var(--transition);
}
.project-card:hover .project-overlay { opacity: 1; }
.project-card:hover .project-image img { transform: scale(1.08); filter: brightness(0.6); }
.project-link {
    display: flex; align-items: center; justify-content: center;
    width: 2.75rem; height: 2.75rem;
    background: var(--bg); color: var(--teal);
    border-radius: 50%; text-decoration: none;
    font-size: var(--font-lg); transition: var(--transition);
    box-shadow: 0 0 16px rgba(0,212,176,0.3);
}
.project-link:hover { transform: scale(1.12); }
.project-content { padding: 1.5rem; }
.project-title {
    font-size: var(--font-base); font-weight: 700;
    margin-bottom: 0.6rem; color: var(--text);
}
.project-description {
    color: var(--text-muted); margin-bottom: 1rem;
    line-height: 1.65; font-size: var(--font-sm);
}
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
    background: rgba(0,212,176,0.07);
    border: 1px solid var(--teal-border);
    color: var(--teal); padding: 0.2rem 0.6rem;
    border-radius: 0.35rem; font-size: var(--font-xs); font-weight: 600;
    letter-spacing: 0.03em;
}

/* ── Publications ── */
.publications { padding: 6rem 0; background: var(--bg); }
.pub-list {
    max-width: 820px;
    margin: 0 auto 3rem;
    display: flex;
    flex-direction: column;
}
.pub-entry {
    padding: 1.6rem 0;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}
.pub-entry:first-child { border-top: 1px solid var(--border); }
.pub-entry:hover { padding-left: 0.6rem; }
.pub-meta-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.55rem;
}
.pub-type {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    padding: 0.2rem 0.55rem;
    border-radius: 0.3rem;
    font-family: 'Courier New', monospace;
}
.pub-type--journal  { background: rgba(56,189,248,0.1);   color: #38bdf8;     border: 1px solid rgba(56,189,248,0.2);   }
.pub-type--conf     { background: rgba(0,212,176,0.08);   color: var(--teal); border: 1px solid var(--teal-border);      }
.pub-type--preprint { background: rgba(148,163,184,0.08); color: var(--text-muted); border: 1px solid rgba(148,163,184,0.15); }
.pub-type--thesis   { background: rgba(167,139,250,0.08); color: #a78bfa;     border: 1px solid rgba(167,139,250,0.2);  }
.pub-year {
    font-size: var(--font-xs);
    color: var(--text-faint);
    font-family: 'Courier New', monospace;
    font-weight: 600;
    letter-spacing: 0.04em;
}
.pub-cited {
    font-size: var(--font-xs);
    color: var(--text-faint);
    margin-left: auto;
    letter-spacing: 0.02em;
}
.pub-title {
    font-size: var(--font-base);
    font-weight: 600;
    line-height: 1.55;
    margin-bottom: 0.4rem;
}
.pub-title a {
    color: var(--text);
    text-decoration: none;
    transition: var(--transition);
}
.pub-title a:hover { color: var(--teal); }
.pub-authors {
    font-size: var(--font-sm);
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}
.pub-me {
    color: var(--text);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: var(--teal-border);
    text-underline-offset: 2px;
}
.pub-venue {
    font-size: var(--font-sm);
    color: var(--text-faint);
}
.pub-venue em { font-style: italic; color: var(--text-muted); }
.publications-footer { text-align: center; max-width: 820px; margin: 0 auto; }
.google-scholar-link {
    display: inline-flex; align-items: center; gap: 0.5rem;
    color: var(--teal); text-decoration: none; font-weight: 600;
    border: 1px solid var(--teal-border); padding: 0.6rem 1.4rem;
    border-radius: 0.5rem; transition: var(--transition); font-size: var(--font-sm);
}
.google-scholar-link:hover { background: var(--teal-glow); box-shadow: 0 0 16px rgba(0,212,176,0.2); }

/* ── Course Banner ── */
.course-banner {
    padding: 5rem 0;
    background: var(--bg-raised);
    position: relative; overflow: hidden;
}
.course-banner::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(0,212,176,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,176,0.03) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}
.course-banner-inner {
    display: grid; grid-template-columns: 1fr auto;
    gap: 3rem; align-items: center; position: relative;
    background: var(--bg-card-alt);
    border: 1px solid var(--teal-border);
    border-radius: 1.25rem; padding: 2.5rem 2.75rem;
    box-shadow: 0 0 48px rgba(0,212,176,0.10);
}
@media (max-width: 768px) {
    .course-banner-inner { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.75rem; }
}
.course-badge {
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: rgba(0,212,176,0.1); border: 1px solid var(--teal-border);
    color: var(--teal); padding: 0.25rem 0.75rem;
    border-radius: 2rem; font-size: var(--font-xs);
    font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
    margin-bottom: 0.85rem;
}
.course-banner-text h2 {
    font-size: var(--font-3xl); font-weight: 800;
    letter-spacing: -0.02em; color: var(--text); margin-bottom: 0.75rem;
}
.course-banner-text p { color: var(--text-muted); font-size: var(--font-base); line-height: 1.7; margin-bottom: 1.25rem; }
.course-meta {
    display: flex; flex-wrap: wrap; gap: 1.25rem;
}
.course-meta span {
    display: flex; align-items: center; gap: 0.4rem;
    font-size: var(--font-sm); color: var(--text-muted);
}
.course-meta i { color: var(--teal); }
.course-banner-cta {
    display: flex; flex-direction: column; gap: 0.75rem;
    min-width: 180px;
}
@media (max-width: 768px) { .course-banner-cta { flex-direction: row; flex-wrap: wrap; } }

/* ── Contact ── */
.contact { padding: 6rem 0; background: var(--bg); }
.contact-content {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 4rem; align-items: start;
}
.contact-item {
    display: flex; align-items: flex-start; gap: 1rem; margin-bottom: 1.75rem;
}
.contact-icon {
    display: flex; align-items: center; justify-content: center;
    width: 2.75rem; height: 2.75rem; flex-shrink: 0;
    background: rgba(0,212,176,0.08);
    border: 1px solid var(--teal-border);
    color: var(--teal); border-radius: 0.5rem;
    font-size: var(--font-base); transition: var(--transition);
}
.contact-item:hover .contact-icon { background: var(--teal-glow); box-shadow: 0 0 12px rgba(0,212,176,0.2); }
.contact-details h3 { font-size: var(--font-sm); font-weight: 600; margin-bottom: 0.2rem; color: var(--text); }
.contact-details a {
    color: var(--text-muted); text-decoration: none;
    font-size: var(--font-sm); transition: var(--transition);
}
.contact-details a:hover { color: var(--teal); }
.contact-cta {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem; border-radius: var(--radius);
    text-align: center; transition: var(--transition);
}
.contact-cta:hover { border-color: var(--teal-border); box-shadow: 0 0 24px rgba(0,212,176,0.08); }
.contact-cta h3 { font-size: var(--font-xl); font-weight: 700; margin-bottom: 0.75rem; color: var(--text); }
.contact-cta p { color: var(--text-muted); margin-bottom: 1.5rem; line-height: 1.7; font-size: var(--font-sm); }
@media (max-width: 768px) { .contact-content { grid-template-columns: 1fr; gap: 2.5rem; } }

/* ── Footer ── */
.footer {
    background: var(--bg-raised);
    border-top: 1px solid var(--border);
    color: var(--text-muted); padding: 2rem 0;
    font-size: var(--font-sm);
}
.footer-content { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.footer-social { display: flex; gap: 0.75rem; }
.footer-social a {
    display: flex; align-items: center; justify-content: center;
    width: 2.25rem; height: 2.25rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    color: var(--text-muted); border-radius: 0.4rem;
    text-decoration: none; transition: var(--transition);
}
.footer-social a:hover { background: var(--teal-glow); color: var(--teal); border-color: var(--teal-border); }
@media (max-width: 768px) { .footer-content { flex-direction: column; text-align: center; } }

/* ── Nav active state ── */
.nav-link[aria-current="page"] {
    color: var(--teal);
}
.nav-link[aria-current="page"]::after {
    width: 100%;
}

/* ── Reveal animation ── */
.reveal {
    opacity: 0;
    transform: translateY(1.25rem);
    transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ── Multi-page layout ── */
.page-main {
    padding-top: 3.75rem; /* nav height */
    min-height: calc(100vh - 3.75rem);
}
.page-section {
    padding: 5rem 0;
}
.page-header {
    margin-bottom: 3.5rem;
}
.page-title {
    font-size: var(--font-5xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-bottom: 0.75rem;
    line-height: 1.1;
}
@media (max-width: 768px) {
    .page-title { font-size: var(--font-4xl); }
    .page-section { padding: 3.5rem 0; }
}

/* ── Home page nav cards ── */
.page-nav-section {
    background: var(--bg-raised);
    padding: 4rem 0 5rem;
    border-top: 1px solid var(--border);
}
.page-nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}
.page-nav-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem 1.5rem;
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
}
.page-nav-card:hover {
    border-color: var(--teal-border);
    box-shadow: 0 0 24px rgba(0,212,176,0.10);
    transform: translateY(-3px);
}
.page-nav-icon {
    display: flex; align-items: center; justify-content: center;
    width: 2.5rem; height: 2.5rem; flex-shrink: 0;
    background: rgba(0,212,176,0.08);
    border: 1px solid var(--teal-border);
    border-radius: 0.5rem;
    color: var(--teal);
    font-size: 1rem;
    transition: var(--transition);
}
.page-nav-card:hover .page-nav-icon {
    background: var(--teal-glow);
    box-shadow: 0 0 12px rgba(0,212,176,0.2);
}
.page-nav-text { flex: 1; }
.page-nav-text h3 {
    font-size: var(--font-base);
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.page-nav-text p {
    font-size: var(--font-xs);
    color: var(--text-muted);
    line-height: 1.4;
}
.page-nav-arrow {
    color: var(--text-faint);
    font-size: var(--font-sm);
    transition: var(--transition);
}
.page-nav-card:hover .page-nav-arrow {
    color: var(--teal);
    transform: translateX(3px);
}
@media (max-width: 768px) {
    .page-nav-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
    .page-nav-grid { grid-template-columns: 1fr; }
}

/* ── Animations ── */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(1.5rem); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(1.5rem); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%       { transform: translateX(-50%) translateY(-0.4rem); }
}

/* Scroll reveal */
.scroll-animate { opacity: 1; transform: translateY(0); transition: all 0.6s ease-out; }
.scroll-animate.animate-in { opacity: 0; transform: translateY(1.5rem); }
.scroll-animate.active { opacity: 1; transform: translateY(0); }
.scroll-animate.animate-in { animation: fallbackVisible 0.1s ease-out 3s forwards; }
@keyframes fallbackVisible { to { opacity: 1; transform: translateY(0); } }

/* ── Publication list cleanup ── */
.publications-list ol { list-style: none; }