/* ============================================================
   SEYED MOHAMAD MOGHADAS - PhD Portfolio
   style.css - Complete Stylesheet
   ============================================================ */

/* ---------- CSS Custom Properties (Light Theme) ---------- */
:root {
    /* Colors */
    --color-bg:            #f8f9fc;
    --color-bg-alt:        #ffffff;
    --color-bg-card:       #ffffff;
    --color-surface:       #eef1f6;
    --color-text:          #1a202c;
    --color-text-secondary:#4a5568;
    --color-text-muted:    #656f7e;
    --color-heading:       #0f172a;

    /* Brand */
    --color-primary:       #0e7490;
    --color-primary-light: #22d3ee;
    --color-primary-dark:  #0c4a6e;
    --color-accent:        #0891b2;
    --color-accent-glow:   rgba(14, 116, 144, 0.15);

    /* Venue badges */
    --color-neurips:       #6d28d9;
    --color-ieee:          #1d4ed8;
    --color-preprint:      #b45309;

    /* CTA */
    --color-cta-bg:        linear-gradient(135deg, #0e7490 0%, #0c4a6e 100%);
    --color-cta-text:      #ffffff;

    /* Borders / Shadows */
    --color-border:        #e2e8f0;
    --shadow-sm:           0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md:           0 4px 14px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);
    --shadow-lg:           0 10px 30px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);
    --shadow-glow:         0 0 30px rgba(14, 116, 144, 0.12);

    /* Layout */
    --nav-height:          72px;
    --container-max:       1100px;
    --border-radius:       12px;
    --border-radius-sm:    8px;

    /* Transitions */
    --transition-fast:     0.2s ease;
    --transition:          0.35s ease;
    --transition-slow:     0.5s ease;

    /* Fonts */
    --font-sans:           'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono:           'JetBrains Mono', 'Fira Code', monospace;
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
    --color-bg:            #0b1120;
    --color-bg-alt:        #111827;
    --color-bg-card:       #1a2332;
    --color-surface:       #1e293b;
    --color-text:          #e2e8f0;
    --color-text-secondary:#94a3b8;
    --color-text-muted:    #7d8da1;
    --color-heading:       #f1f5f9;

    --color-primary:       #22d3ee;
    --color-primary-light: #67e8f9;
    --color-primary-dark:  #0e7490;
    --color-accent:        #06b6d4;
    --color-accent-glow:   rgba(34, 211, 238, 0.12);

    --color-cta-bg:        linear-gradient(135deg, #164e63 0%, #0e7490 100%);

    --color-border:        #2d3a4f;
    --shadow-sm:           0 1px 3px rgba(0,0,0,0.2), 0 1px 2px rgba(0,0,0,0.15);
    --shadow-md:           0 4px 14px rgba(0,0,0,0.25), 0 2px 6px rgba(0,0,0,0.15);
    --shadow-lg:           0 10px 30px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
    --shadow-glow:         0 0 30px rgba(34, 211, 238, 0.08);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
}

::selection {
    background: var(--color-primary);
    color: #ffffff;
}

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

a:hover {
    color: var(--color-primary-light);
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ---------- Skip to Content (Accessibility) ---------- */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 16px;
    z-index: 10000;
    padding: 12px 24px;
    background: var(--color-primary);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    transition: top 0.2s ease;
}

.skip-to-content:focus {
    top: 12px;
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

/* ---------- Container ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Sections ---------- */
.section {
    padding: 100px 0;
}

.section:nth-child(even) {
    background-color: var(--color-bg-alt);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 48px;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.title-number {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--color-primary);
    margin-right: 8px;
    font-weight: 500;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-top: -32px;
    margin-bottom: 40px;
    max-width: 600px;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(248, 249, 252, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

[data-theme="dark"] .navbar {
    background: rgba(11, 17, 32, 0.88);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-heading);
    letter-spacing: -0.03em;
    transition: color var(--transition);
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-links a {
    display: block;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--border-radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
    background: var(--color-accent-glow);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    background: var(--color-bg-card);
    cursor: pointer;
    color: var(--color-text-secondary);
    font-size: 1rem;
    transition: all var(--transition-fast);
    margin-left: 8px;
    position: relative;
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.theme-toggle .fa-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: inline-block;
    color: #fbbf24;
}

/* Hamburger Menu */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    overflow: hidden;
    background: var(--color-bg);
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, var(--color-accent-glow) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(14, 116, 144, 0.06) 0%, transparent 40%);
    pointer-events: none;
}

[data-theme="dark"] .hero-bg-pattern {
    background-image:
        radial-gradient(circle at 20% 50%, rgba(34, 211, 238, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(34, 211, 238, 0.03) 0%, transparent 40%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 60px;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 80px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: linear-gradient(135deg, rgba(14, 116, 144, 0.15) 0%, rgba(6, 182, 212, 0.1) 100%);
    border: 2px solid var(--color-primary);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 28px;
    animation: badge-pulse 2.5s ease-in-out infinite;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

@keyframes badge-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(14, 116, 144, 0.25); }
    50%      { box-shadow: 0 0 0 10px rgba(14, 116, 144, 0); }
}

[data-theme="dark"] .hero-badge {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.1) 0%, rgba(6, 182, 212, 0.06) 100%);
    border-color: var(--color-primary);
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 3.75rem);
    font-weight: 800;
    color: var(--color-heading);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

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

.hero-title {
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.hero-affiliation,
.hero-location {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.hero-affiliation i,
.hero-location i {
    width: 20px;
    color: var(--color-primary);
    margin-right: 6px;
}

.hero-tagline {
    margin-top: 20px;
    margin-bottom: 32px;
    padding-left: 16px;
    border-left: 3px solid var(--color-primary);
}

.hero-tagline p {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border-radius: var(--border-radius-sm);
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #ffffff;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #ffffff;
    transform: translateY(-1px);
}

.btn-cta {
    background: #ffffff;
    color: var(--color-primary-dark);
    border-color: #ffffff;
    font-size: 1rem;
    padding: 14px 32px;
}

.btn-cta:hover {
    background: #f0fdfa;
    color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

/* Hero Portrait */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-portrait {
    position: relative;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-primary);
    box-shadow: 0 0 0 8px rgba(14, 116, 144, 0.12), 0 20px 40px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-portrait:hover {
    transform: scale(1.03);
    box-shadow: 0 0 0 10px rgba(14, 116, 144, 0.18), 0 24px 48px rgba(0, 0, 0, 0.2);
}

.hero-portrait-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    animation: scroll-bounce 2s ease-in-out infinite;
}

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

/* ============================================================
   ABOUT
   ============================================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
    align-items: start;
}

.about-text p {
    margin-bottom: 16px;
    color: var(--color-text-secondary);
    font-size: 1.02rem;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-text strong {
    color: var(--color-text);
    font-weight: 600;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.highlight-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.highlight-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    color: var(--color-primary);
    border-radius: 10px;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.highlight-number {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-heading);
    line-height: 1.1;
}

.highlight-label {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ============================================================
   RESEARCH INTERESTS
   ============================================================ */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.research-card {
    padding: 28px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.research-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.research-card:hover::before {
    transform: scaleX(1);
}

.research-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    color: var(--color-primary);
    border-radius: 12px;
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.research-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 8px;
    line-height: 1.3;
}

.research-card p {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.pub-card {
    position: relative;
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    transition: all var(--transition);
}

.pub-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.pub-card:last-child {
    margin-bottom: 0;
}

.pub-venue-badge {
    display: inline-block;
    padding: 4px 14px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    border-radius: 50px;
    color: #ffffff;
    margin-bottom: 14px;
    text-transform: uppercase;
}

.venue-neurips {
    background: var(--color-neurips);
}

.venue-ieee {
    background: var(--color-ieee);
}

.venue-preprint {
    background: var(--color-preprint);
}

.pub-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-heading);
    line-height: 1.4;
    margin-bottom: 10px;
}

.pub-authors {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.pub-authors strong {
    color: var(--color-primary);
    font-weight: 600;
}

.pub-venue {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.pub-venue i,
.pub-detail i {
    width: 18px;
    color: var(--color-primary);
    margin-right: 4px;
}

.pub-detail {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}

.pub-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-accent-glow);
    border: 1px solid transparent;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.pub-link:hover {
    background: var(--color-primary);
    color: #ffffff;
    transform: translateY(-1px);
}

/* ============================================================
   REVIEWING
   ============================================================ */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.review-card {
    padding: 28px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition);
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.review-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    color: var(--color-primary);
    border-radius: 14px;
    font-size: 1.3rem;
    margin: 0 auto 16px;
}

.review-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 6px;
}

.review-card p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ============================================================
   EDUCATION TIMELINE
   ============================================================ */
.timeline {
    position: relative;
    padding-left: 48px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-primary-light));
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-bottom: 48px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -48px;
    top: 4px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    color: var(--color-primary);
    font-size: 1rem;
    z-index: 1;
    transition: all var(--transition);
}

.timeline-item:hover .timeline-marker {
    background: var(--color-primary);
    color: #ffffff;
    box-shadow: var(--shadow-glow);
}

.timeline-content {
    padding: 24px 28px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.timeline-item:hover .timeline-content {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.timeline-badge {
    display: inline-block;
    padding: 3px 12px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-accent-glow);
    border-radius: 4px;
    margin-bottom: 12px;
}

.timeline-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 4px;
}

.timeline-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-content h4 a {
    color: var(--color-primary);
}

.timeline-department {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.timeline-content p i {
    color: var(--color-primary);
    margin-right: 4px;
    width: 16px;
}

/* ============================================================
   CTA BANNER (Research Stay)
   ============================================================ */
.cta-section {
    padding: 80px 0;
    background: transparent !important;
}

.cta-banner {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 48px 44px;
    background: var(--color-cta-bg);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
    pointer-events: none;
}

.cta-icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.15);
    border-radius: 16px;
    font-size: 1.6rem;
    color: var(--color-cta-text);
}

.cta-text {
    flex: 1;
}

.cta-text h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-cta-text);
    margin-bottom: 8px;
    line-height: 1.3;
}

.cta-text p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.85);
    line-height: 1.6;
}

.cta-text strong {
    color: #ffffff;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    text-decoration: none;
    color: var(--color-text);
}

.contact-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    color: var(--color-text);
}

.contact-card i {
    font-size: 1.5rem;
    color: var(--color-primary);
    width: 32px;
    text-align: center;
    flex-shrink: 0;
}

.contact-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.contact-value {
    display: block;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-text);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    padding: 48px 0;
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 4px;
}

.footer-affiliation {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.footer-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    background: var(--color-primary);
    color: #ffffff;
    transform: translateY(-2px);
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered children */
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.25s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.3s; }

/* ============================================================
   RESPONSIVE - Tablet
   ============================================================ */
@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: left;
    }

    .hero-visual {
        order: -1;
    }

    .hero-portrait {
        width: 200px;
        height: 200px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-highlights {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .highlight-card {
        flex: 1;
        min-width: 150px;
    }

    .cta-banner {
        flex-direction: column;
        text-align: center;
        padding: 36px 28px;
        gap: 20px;
    }
}

/* ============================================================
   RESPONSIVE - Mobile
   ============================================================ */
@media (max-width: 640px) {
    .section {
        padding: 64px 0;
    }

    .section-title {
        margin-bottom: 32px;
    }

    .section-subtitle {
        margin-top: -20px;
        margin-bottom: 28px;
    }

    /* Mobile nav */
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-bg-card);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 32px 32px;
        gap: 4px;
        box-shadow: -4px 0 24px rgba(0,0,0,0.1);
        transition: right var(--transition);
        z-index: 999;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        width: 100%;
        font-size: 1rem;
        padding: 12px 16px;
    }

    .theme-toggle {
        margin-left: 0;
        margin-top: 16px;
    }

    /* Hero mobile */
    .hero {
        min-height: auto;
        padding-top: calc(var(--nav-height) + 32px);
        padding-bottom: 32px;
    }

    .hero-content {
        padding-top: 16px;
        padding-bottom: 48px;
    }

    .hero-badge {
        font-size: 0.78rem;
        padding: 8px 14px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        justify-content: center;
        width: 100%;
    }

    .hero-scroll-indicator {
        display: none;
    }

    /* Publications mobile */
    .pub-card {
        padding: 20px;
    }

    /* Research grid mobile */
    .research-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .research-card {
        padding: 20px 16px;
    }

    .research-card p {
        display: none;
    }

    /* Contact grid mobile */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* Review grid mobile */
    .review-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .review-card {
        padding: 20px 16px;
    }

    .review-card p {
        font-size: 0.75rem;
    }

    /* Timeline mobile */
    .timeline {
        padding-left: 40px;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-marker {
        left: -40px;
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }

    .timeline-content {
        padding: 18px 20px;
    }

    /* Footer mobile */
    .footer {
        padding: 36px 0;
    }
}

/* Very small screens */
@media (max-width: 400px) {
    .research-grid {
        grid-template-columns: 1fr;
    }

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

    .about-highlights {
        flex-direction: column;
    }

    .highlight-card {
        min-width: auto;
    }
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
    *,
    *::before,
    *::after {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    body {
        font-size: 11pt;
        line-height: 1.5;
    }

    .navbar,
    .theme-toggle,
    .hero-scroll-indicator,
    .hero-visual,
    .hero-bg-pattern,
    .nav-toggle,
    .skip-to-content {
        display: none !important;
    }

    .hero {
        min-height: auto;
        padding: 24pt 0;
    }

    .hero-badge {
        border: 1px solid #000;
        padding: 4pt 10pt;
    }

    .section {
        padding: 24pt 0;
        page-break-inside: avoid;
    }

    .pub-card,
    .research-card,
    .review-card,
    .contact-card,
    .timeline-content,
    .highlight-card {
        border: 1px solid #ccc !important;
        page-break-inside: avoid;
    }

    .pub-venue-badge {
        border: 1px solid #000;
        color: #000 !important;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        word-break: break-all;
    }

    .nav-links a::after,
    .hero-actions a::after,
    .footer-links a::after,
    .btn::after {
        content: none;
    }

    .cta-banner {
        border: 2px solid #000;
        padding: 16pt;
    }

    .animate-on-scroll {
        opacity: 1 !important;
        transform: none !important;
    }
}