/* ═══════════════════════════════════════════════════════════════
   DESIGN TOKENS — LIGHT MODERN TECH THEME
   ═══════════════════════════════════════════════════════════════ */
:root {
    /* Backgrounds */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;

    /* Text */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    /* Accent & Brand Colors */
    --accent-purple: #6366f1;
    --accent-purple-dark: #4f46e5;
    --accent-cyan: #0284c7;
    --accent-cyan-dark: #0369a1;
    --accent-pink: #ec4899;

    /* Gradients */
    --gradient-main: linear-gradient(135deg, #4f46e5 0%, #0284c7 100%);
    --gradient-hover: linear-gradient(135deg, #4338ca 0%, #0369a1 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(2, 132, 199, 0.06));

    /* Glass & Card Tokens */
    --card-bg: rgba(255, 255, 255, 0.92);
    --card-border: rgba(226, 232, 240, 0.9);
    --card-border-hover: rgba(99, 102, 241, 0.35);
    --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    --card-shadow-hover: 0 16px 36px -8px rgba(99, 102, 241, 0.14), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
    --glass-blur: 16px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing */
    --section-padding: 100px;
    --container-max: 1120px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.6s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

/* ═══════════════════════════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════════════════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

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

/* ═══════════════════════════════════════════════════════════════
   CARDS & GLASSMORPHISM
   ═══════════════════════════════════════════════════════════════ */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-medium),
                border-color var(--transition-medium),
                box-shadow var(--transition-medium);
}

.glass-card:hover {
    border-color: var(--card-border-hover);
    box-shadow: var(--card-shadow-hover);
}

/* ═══════════════════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    outline: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-main);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background: var(--gradient-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
    color: #ffffff;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background: #ffffff;
    border-color: var(--accent-purple);
    color: var(--accent-purple-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.08);
}

/* ═══════════════════════════════════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════════════════════════════════ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-medium);
}

.navbar.scrolled {
    padding: 12px 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}

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

.nav-logo {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: transform var(--transition-fast);
}

.nav-logo:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
    margin-left: auto;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--accent-purple-dark);
    background: rgba(99, 102, 241, 0.06);
}

.nav-link.active {
    color: var(--accent-purple-dark);
    background: rgba(99, 102, 241, 0.1);
    font-weight: 600;
}

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

.nav-toggle span {
    width: 22px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ═══════════════════════════════════════════════════════════════
   HERO SECTION
   ═══════════════════════════════════════════════════════════════ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 60px;
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 30%, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
}

#particle-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: auto;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero-greeting {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-cyan-dark);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.hero-name {
    font-size: clamp(3rem, 7vw, 4.75rem);
    font-weight: 900;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.name-line {
    display: inline-block;
}

.name-accent {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-tagline {
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 36px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    opacity: 0;
    animation: fadeIn 1s ease 1.8s forwards;
}

.scroll-line {
    width: 2px;
    height: 50px;
    background: linear-gradient(to bottom, var(--accent-purple), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
    border-radius: 2px;
}

/* ═══════════════════════════════════════════════════════════════
   SECTION COMMON STYLES
   ═══════════════════════════════════════════════════════════════ */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(226, 232, 240, 0.9), transparent);
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-cyan-dark);
    letter-spacing: 0.12em;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-line {
    width: 50px;
    height: 3px;
    background: var(--gradient-main);
    margin: 0 auto;
    border-radius: 3px;
}

/* ═══════════════════════════════════════════════════════════════
   ABOUT SECTION
   ═══════════════════════════════════════════════════════════════ */
.about-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 44px;
    align-items: center;
}

.photo-frame {
    position: relative;
    width: 240px;
    height: 240px;
    margin: 0 auto;
    border-radius: 50%;
    padding: 4px;
    background: var(--gradient-main);
    box-shadow: 0 12px 30px rgba(99, 102, 241, 0.2);
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    display: block;
}

.about-content .glass-card {
    padding: 38px;
}

.about-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 18px;
    line-height: 1.8;
}

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

/* ═══════════════════════════════════════════════════════════════
   EXPERIENCE SECTION (WITH FIGURES)
   ═══════════════════════════════════════════════════════════════ */
.experience-list {
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.experience-card {
    display: grid;
    grid-template-columns: 340px 1fr;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-medium),
                border-color var(--transition-medium),
                box-shadow var(--transition-medium);
}

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

.experience-visual {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    border-right: 1px solid var(--card-border);
    overflow: hidden;
}

.experience-figure {
    width: 100%;
    max-width: 280px;
    height: auto;
    filter: drop-shadow(0 4px 12px rgba(15, 23, 42, 0.08));
    transition: transform var(--transition-medium);
}

.experience-card:hover .experience-figure {
    transform: scale(1.03);
}

.figure-caption {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    margin-top: 12px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.experience-content {
    padding: 34px 38px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.experience-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.experience-date {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-purple-dark);
    padding: 3px 10px;
    background: rgba(99, 102, 241, 0.08);
    border-radius: 100px;
}

.experience-location {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

.experience-header {
    margin-bottom: 14px;
}

.experience-company {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 2px;
    letter-spacing: -0.015em;
}

.experience-role {
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--accent-purple-dark);
}

.experience-desc {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.experience-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.experience-topic {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(241, 245, 249, 0.9);
    border: 1px solid var(--card-border);
    padding: 4px 12px;
    border-radius: 100px;
}

/* ═══════════════════════════════════════════════════════════════
   MINIMAL PUBLICATIONS SECTION
   ═══════════════════════════════════════════════════════════════ */
.pub-minimal-list {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--card-border);
}

.pub-minimal-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 28px;
    padding: 24px 0;
    border-bottom: 1px solid var(--card-border);
    transition: background-color var(--transition-fast), padding-left var(--transition-fast);
}

.pub-minimal-item:hover {
    background: rgba(99, 102, 241, 0.02);
    padding-left: 12px;
}

.pub-minimal-year {
    font-size: 1rem;
    font-weight: 800;
    color: var(--accent-purple-dark);
    padding-top: 2px;
}

.pub-minimal-content {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.pub-minimal-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.45;
    letter-spacing: -0.01em;
}

.pub-minimal-authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.pub-minimal-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 4px;
    font-size: 0.85rem;
}

.pub-minimal-venue {
    font-weight: 700;
    color: var(--accent-cyan-dark);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    background: rgba(14, 165, 233, 0.08);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

a.pub-minimal-venue:hover {
    color: var(--accent-purple-dark);
    background: rgba(99, 102, 241, 0.12);
    transform: translateY(-1px);
}

.publications-more {
    text-align: center;
    margin-top: 36px;
}

/* ═══════════════════════════════════════════════════════════════
   CONTACT SECTION
   ═══════════════════════════════════════════════════════════════ */
.contact-grid {
    max-width: 720px;
    margin: 0 auto;
}

.contact-card {
    padding: 32px;
    text-align: center;
    margin-bottom: 28px;
}

.contact-email {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-purple-dark);
    transition: color var(--transition-fast);
}

.contact-email:hover {
    color: var(--accent-cyan-dark);
}

.social-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.social-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px 16px;
    text-align: center;
    color: var(--text-secondary);
    transition: all var(--transition-medium);
}

.social-card svg {
    color: var(--text-muted);
    transition: all var(--transition-medium);
}

.social-card:hover {
    transform: translateY(-4px);
    color: var(--accent-purple-dark);
}

.social-card:hover svg {
    color: var(--accent-purple-dark);
    fill: var(--accent-purple-dark);
    transform: scale(1.1);
}

#social-email:hover svg {
    stroke: var(--accent-purple-dark);
    fill: none;
}

.social-card span {
    font-size: 0.88rem;
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════════ */
.footer {
    padding: 44px 0;
    text-align: center;
    border-top: 1px solid rgba(226, 232, 240, 0.9);
    background: #ffffff;
}

.footer p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-note {
    margin-top: 4px;
    font-size: 0.82rem !important;
}

/* ═══════════════════════════════════════════════════════════════
   SCROLL REVEAL ANIMATIONS
   ═══════════════════════════════════════════════════════════════ */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.experience-list .reveal:nth-child(1) { transition-delay: 0s; }
.experience-list .reveal:nth-child(2) { transition-delay: 0.1s; }
.experience-list .reveal:nth-child(3) { transition-delay: 0.2s; }
.experience-list .reveal:nth-child(4) { transition-delay: 0.3s; }

.pub-minimal-list .reveal:nth-child(1) { transition-delay: 0s; }
.pub-minimal-list .reveal:nth-child(2) { transition-delay: 0.06s; }
.pub-minimal-list .reveal:nth-child(3) { transition-delay: 0.12s; }
.pub-minimal-list .reveal:nth-child(4) { transition-delay: 0.18s; }
.pub-minimal-list .reveal:nth-child(5) { transition-delay: 0.24s; }
.pub-minimal-list .reveal:nth-child(6) { transition-delay: 0.3s; }

.social-links .social-card:nth-child(1) { transition-delay: 0s; }
.social-links .social-card:nth-child(2) { transition-delay: 0.08s; }
.social-links .social-card:nth-child(3) { transition-delay: 0.16s; }

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(1);
    }
    50% {
        opacity: 0.9;
        transform: scaleY(1.15);
    }
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════════ */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .photo-frame {
        width: 200px;
        height: 200px;
    }

    .experience-card {
        grid-template-columns: 280px 1fr;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    /* Nav Mobile */
    .nav-toggle {
        display: flex;
        margin-left: auto;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 90px 28px 28px;
        gap: 6px;
        transition: right var(--transition-medium);
        border-left: 1px solid var(--card-border);
        box-shadow: -10px 0 30px rgba(15, 23, 42, 0.08);
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-link {
        padding: 12px 18px;
        font-size: 1rem;
    }

    /* Hero Mobile */
    .hero-name {
        font-size: clamp(2.4rem, 10vw, 3.6rem);
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    /* Experience Card Mobile */
    .experience-card {
        grid-template-columns: 1fr;
    }

    .experience-visual {
        border-right: none;
        border-bottom: 1px solid var(--card-border);
        padding: 24px 20px;
    }

    .experience-content {
        padding: 28px 24px;
    }

    /* Publications Mobile */
    .pub-minimal-item {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .pub-minimal-year {
        color: var(--accent-purple-dark);
        font-size: 0.9rem;
    }

    /* Social Mobile */
    .social-links {
        grid-template-columns: repeat(3, 1fr);
    }

    .section-header {
        margin-bottom: 40px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-name {
        font-size: 2.2rem;
    }

    .about-content .glass-card,
    .experience-content,
    .contact-card {
        padding: 20px;
    }

    .social-links {
        grid-template-columns: 1fr;
    }
}

/* ═══════════════════════════════════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

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

    html {
        scroll-behavior: auto;
    }
}