/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    --gray-950: #0a0a0a;
    --black: #000000;
    --accent: #111111;
    --bg: #ffffff;
    --bg-alt: #fafafa;
    --bg-card: #ffffff;
    --text: #404040;
    --text-heading: #0a0a0a;
    --text-muted: #737373;
    --border: #e5e5e5;
    --border-light: #f5f5f5;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xl: 20px;
    --nav-height: 72px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

/* Dark mode overrides */
html.dark {
    --bg: #0a0a0a;
    --bg-alt: #141414;
    --bg-card: #1a1a1a;
    --text: #d4d4d4;
    --text-heading: #f5f5f5;
    --text-muted: #a3a3a3;
    --border: #2a2a2a;
    --border-light: #1f1f1f;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

/* ========================================
   Utility
   ======================================== */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 120px 0;
    position: relative;
}

.section-alt {
    background: var(--bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

/* Minimal placeholder sections */
.coming-soon-title {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    text-transform: lowercase;
    margin-bottom: 16px;
}

.under-construction {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: lowercase;
    color: var(--text-muted);
    opacity: 0.55;
    margin: 0;
}

.uc-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    animation: uc-pulse 2s ease-in-out infinite;
    flex-shrink: 0;
}

@keyframes uc-pulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50%       { opacity: 1;   transform: scale(1.3); }
}

.scholar-sentence {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin: 0;
}

.scholar-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: inherit;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: color 0.2s, border-color 0.2s;
}

.scholar-link svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.scholar-link:hover {
    color: var(--text-heading);
    border-color: var(--text-muted);
}

.section-tag {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    color: var(--text-heading);
    letter-spacing: -0.03em;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    position: relative;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: var(--gray-950);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--gray-800);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text-heading);
    border: 1.5px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--gray-900);
    background: var(--gray-50);
    transform: translateY(-2px);
}

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

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
}

html.dark .navbar.scrolled {
    background: rgba(10, 10, 10, 0.85);
}

.nav-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--text-heading);
    letter-spacing: -0.03em;
    text-decoration: none;
}

.nav-logo strong {
    font-weight: 700;
}

.logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-accent {
    font-weight: 400;
    color: var(--text-muted);
}

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

.nav-links a {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 450;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-heading);
    background: var(--gray-100);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* DNA spawn button (bottom-right of hero) */
.dna-spawn-btn {
    position: absolute;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1.5px solid rgba(120, 120, 120, 0.35);
    background: rgba(255, 255, 255, 0.08);
    color: rgba(120, 120, 120, 0.7);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: border-color 0.25s, color 0.25s, transform 0.2s, background 0.25s;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.dna-spawn-btn svg {
    width: 18px;
    height: 18px;
}

.dna-spawn-btn:hover {
    border-color: rgba(120, 120, 120, 0.7);
    color: rgba(120, 120, 120, 1);
    background: rgba(255, 255, 255, 0.14);
    transform: scale(1.1);
}

.dna-spawn-btn:active {
    transform: scale(0.95);
}

html.dark .dna-spawn-btn {
    border-color: rgba(80, 120, 255, 0.5);
    background: rgba(80, 120, 255, 0.08);
    color: rgba(100, 140, 255, 0.85);
    box-shadow: 0 0 10px rgba(80, 120, 255, 0.35), 0 0 20px rgba(80, 120, 255, 0.15);
}

html.dark .dna-spawn-btn:hover {
    border-color: rgba(100, 140, 255, 0.85);
    color: rgba(120, 160, 255, 1);
    background: rgba(80, 120, 255, 0.16);
    box-shadow: 0 0 16px rgba(80, 120, 255, 0.6), 0 0 32px rgba(80, 120, 255, 0.25);
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: none;
    background: var(--bg);
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    padding: 0;
}

@keyframes pulse-glow {
    0%   { transform: scale(1);    filter: drop-shadow(0 0 0px rgba(120, 120, 120, 0)); }
    40%  { transform: scale(1.45); filter: drop-shadow(0 0 8px rgba(180, 180, 180, 0.95)) drop-shadow(0 0 18px rgba(120, 120, 120, 0.5)); }
    100% { transform: scale(1);    filter: drop-shadow(0 0 0px rgba(120, 120, 120, 0)); }
}

.theme-toggle.pulse-hint .icon-moon {
    animation: pulse-glow 1.2s ease-in-out 3;
    transform-origin: center;
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

.theme-toggle:hover {
    border-color: var(--gray-400);
    color: var(--text-heading);
    background: var(--bg-alt);
}

/* Show sun in dark mode, moon in light mode */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
html.dark .theme-toggle .icon-sun { display: block; }
html.dark .theme-toggle .icon-moon { display: none; }

/* ---- Dark mode element overrides ---- */
/* Light-gray backgrounds → dark */
html.dark .nav-links a:hover,
html.dark .nav-links a.active { background: #1a1a1a; }
html.dark .hero-badge { background: #141414; }
html.dark .btn-secondary:hover { background: #1a1a1a; }
html.dark .lang-toggle:hover { background: #1a1a1a; }
html.dark .about-kw { background: #1a1a1a; color: #d4d4d4; }
html.dark .about-photo { background: #262626; }
html.dark .about-photo-ring { box-shadow: 0 0 0 2px #404040; }
html.dark .tw-code { background: #1a1a1a; color: #d4d4d4; }
html.dark .skill-tag { background: #141414; }
html.dark .project-placeholder { background: #171717; }
html.dark .project-tags span { background: #171717; }

/* Dark-gray text → light */
html.dark .service-icon { color: #a3a3a3; }
html.dark .service-card:hover .service-icon { color: #f5f5f5; }

/* Borders/shadows → subtle for dark bg */
html.dark .btn-secondary { border-color: #404040; }
html.dark .mouse { border-color: #404040; }
html.dark .service-card:hover,
html.dark .skills-category:hover,
html.dark .project-card:hover,
html.dark .contact-link:hover,
html.dark .pubsoft-card:hover { border-color: #404040; }

/* Cards explicit bg */
html.dark .project-card,
html.dark .pubsoft-card,
html.dark .service-card,
html.dark .contact-link { background: #1a1a1a; }

/* Intentionally-dark elements stay dark */
html.dark .btn-primary { background: #f5f5f5; color: #0a0a0a; }
html.dark .btn-primary:hover { background: #e5e5e5; }
html.dark .skill-tag:hover { background: #f5f5f5; color: #0a0a0a; border-color: #f5f5f5; }
html.dark .footer { background: #0a0a0a; }
html.dark .footer-links a { border-color: #262626; }
html.dark .footer-links a:hover { background: #1a1a1a; border-color: #404040; }

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 8px;
    border: 1.5px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    letter-spacing: 0.02em;
}

.lang-toggle:hover {
    border-color: var(--gray-400);
    background: var(--gray-50);
}

.lang-flag {
    font-size: 1rem;
    line-height: 1;
}

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

.menu-toggle span {
    width: 20px;
    height: 1.5px;
    background: var(--text-heading);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(4.5px, 4.5px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4.5px, -4.5px);
}

/* ========================================
   Hero
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: calc(50vh - 100px);
    background: var(--bg);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

#particles-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

#dna-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    -webkit-mask-image: radial-gradient(ellipse 44% 34% at 50% 48%, transparent 0%, transparent 50%, black 95%);
    mask-image: radial-gradient(ellipse 44% 34% at 50% 48%, transparent 0%, transparent 50%, black 95%);
}


.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 720px;
    padding: 0 24px;
    min-height: 200px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 32px;
    animation: fadeInDown 0.8s ease-out;
}

.badge-dot {
    width: 7px;
    height: 7px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.4); }
}

.hero h1 {
    margin-bottom: 8px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-greeting {
    display: block;
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    font-weight: 400;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    color: var(--text-heading);
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.hero-title {
    font-size: clamp(1.05rem, 2vw, 1.3rem);
    font-weight: 500;
    color: var(--text);
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-description {
    font-size: clamp(1.15rem, 1.8vw, 1.4rem);
    color: var(--text-muted);
    margin: 0 auto 40px;
    line-height: 1.75;
    white-space: pre-line;
    min-height: 4em;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

#typewriter {
    color: var(--text-muted);
    font-weight: 400;
}

.tw-code {
    font-family: var(--font-mono);
    font-size: 0.95em;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--gray-100);
    padding: 1px 5px;
    border-radius: 4px;
}

.typewriter-cursor {
    display: inline-block;
    color: var(--text-muted);
    font-weight: 300;
    margin-left: 1px;
    animation: blink 0.75s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}

.hero-social {
    display: flex;
    align-items: center;
    gap: 16px;
    justify-content: center;
    margin-top: 32px;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-social-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.01em;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-muted);
    transition: color 0.2s, transform 0.2s;
}

.social-link:hover {
    color: var(--text-heading);
    transform: translateY(-2px);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 1s both;
    padding-top: 40px;
    border-top: 1px solid var(--border-light);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-heading);
    font-family: var(--font-mono);
    letter-spacing: -0.03em;
}

.stat-plus {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-muted);
}

.stat-label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 4px;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2.5s infinite;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 1.5px solid var(--gray-300);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.mouse-wheel {
    width: 3px;
    height: 7px;
    background: var(--gray-400);
    border-radius: 2px;
    animation: scroll-wheel 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes scroll-wheel {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(6px); }
}

/* ========================================
   About
   ======================================== */
.about-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 72px;
    align-items: center;
}

/* Circular photo */
.about-photo-col {
    display: flex;
    justify-content: center;
}

.about-photo-ring {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    padding: 6px;
    background: var(--bg-alt);
    box-shadow: 0 0 0 2px var(--gray-300);
    flex-shrink: 0;
}

.about-photo {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    object-position: center top;
    display: block;
    background: var(--gray-200);
}

/* Content column */
.about-text {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-name {
    font-size: clamp(1.4rem, 2.5vw, 1.9rem);
    font-weight: 800;
    color: var(--text-heading);
    line-height: 1.1;
    margin: 0;
    letter-spacing: -0.02em;
}

.about-phd {
    color: var(--gray-400);
    font-weight: 700;
}

.about-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
    margin: 0;
    line-height: 1.5;
}


.about-expertise {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.about-kw {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--gray-100);
    padding: 3px 8px;
    border-radius: 4px;
}

.about-expertise-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    align-self: center;
    margin-right: 4px;
}

.about-location {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 8px;
}

.about-social {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 20px;
    padding-left: calc(140px + 72px); /* photo width + grid gap → aligns under text column */
}

/* ========================================
   Services
   ======================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.service-card {
    padding: 36px 28px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    position: relative;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
}

.service-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 20px;
    color: var(--gray-600);
}

.service-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 1.5;
}

.service-card:hover .service-icon {
    color: var(--gray-900);
}

.service-card h3 {
    font-size: 1.08rem;
    font-weight: 650;
    color: var(--text-heading);
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

.service-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ========================================
   Skills
   ======================================== */
.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.skills-category {
    padding: 32px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.skills-category:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow);
}

.skills-category h3 {
    font-size: 0.95rem;
    font-weight: 650;
    color: var(--text-heading);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
    letter-spacing: -0.01em;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    padding: 6px 14px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.84rem;
    font-weight: 500;
    color: var(--text);
    transition: all 0.2s ease;
    cursor: default;
    font-family: var(--font-mono);
    letter-spacing: -0.01em;
}

.skill-tag:hover {
    background: var(--gray-950);
    color: var(--white);
    border-color: var(--gray-950);
}

/* ========================================
   Projects
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
}

.project-card a.project-link {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-image {
    aspect-ratio: 16/10;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.4s ease;
    background: var(--gray-100);
}

.project-placeholder .project-icon {
    width: 48px;
    height: 48px;
    color: var(--gray-400);
}

.project-card:hover .project-placeholder {
    transform: scale(1.03);
}

.project-content {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-tags {
    display: flex;
    gap: 6px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.project-tags span {
    padding: 3px 10px;
    background: var(--gray-100);
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-mono);
}

.project-content h3 {
    font-size: 1.05rem;
    font-weight: 650;
    color: var(--text-heading);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.project-content p {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.6;
    flex: 1;
}

.project-arrow {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.project-arrow svg {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
}

.project-card:hover .project-arrow {
    color: var(--text-heading);
}

.project-card:hover .project-arrow svg {
    transform: translateX(4px);
}

/* ========================================
   Publications & Software
   ======================================== */
.pubsoft-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.pubsoft-card {
    padding: 28px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.pubsoft-card:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.pubsoft-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    color: var(--gray-500);
    margin-top: 2px;
}

.pubsoft-icon svg {
    width: 100%;
    height: 100%;
}

.pubsoft-content {
    flex: 1;
    min-width: 0;
}

.pubsoft-type {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-family: var(--font-mono);
}

.pubsoft-card h3 {
    font-size: 1rem;
    font-weight: 650;
    color: var(--text-heading);
    margin-bottom: 6px;
    letter-spacing: -0.02em;
    line-height: 1.4;
}

.pubsoft-card p {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.pubsoft-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.pubsoft-meta span {
    font-size: 0.78rem;
    color: var(--gray-400);
    font-family: var(--font-mono);
}

.pubsoft-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
    margin-top: 8px;
}

.pubsoft-link:hover {
    color: var(--text-heading);
}

.pubsoft-link svg {
    width: 14px;
    height: 14px;
}

/* ========================================
   Contact
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-intro {
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.8;
    margin-bottom: 32px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.contact-link:hover {
    border-color: var(--gray-300);
    transform: translateX(4px);
}

.contact-link-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--gray-500);
}

.contact-link-icon svg {
    width: 100%;
    height: 100%;
}

.contact-link strong {
    display: block;
    color: var(--text-heading);
    font-size: 0.9rem;
    font-weight: 600;
}

.contact-link span {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.contact-form {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: 40px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-heading);
    font-size: 0.92rem;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--gray-500);
    box-shadow: 0 0 0 3px rgba(0,0,0,0.04);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a3a3a3' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-group select option {
    background: var(--bg);
    color: var(--text-heading);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    margin-top: 4px;
    padding: 14px 32px;
}

.form-status {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    display: none;
}

.form-status.success {
    display: block;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.form-status.error {
    display: block;
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--gray-950);
    color: var(--gray-400);
    padding: 48px 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.02em;
}

.footer-brand .logo-accent {
    color: var(--gray-500);
}

.footer-brand .logo-icon {
    width: 24px;
    height: 24px;
}

.footer-brand .logo-icon svg {
    width: 100%;
    height: 100%;
    color: var(--white);
}

.footer-copy {
    color: var(--gray-500);
    font-size: 0.82rem;
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: var(--gray-500);
    transition: var(--transition);
    border: 1px solid var(--gray-800);
}

.footer-links a:hover {
    color: var(--white);
    border-color: var(--gray-600);
    background: var(--gray-800);
}

.footer-links a svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   Scroll Reveal Animation
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
    .services-grid,
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 80px 0;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 8px;
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        font-size: 1.1rem;
        padding: 12px 24px;
    }

    .menu-toggle {
        display: flex;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-photo-ring {
        width: 120px;
        height: 120px;
        margin: 0 auto;
    }

    .about-text {
        text-align: center;
    }

    .about-expertise {
        justify-content: center;
    }

    .about-social {
        justify-content: center;
        padding-left: 0;
    }

    .services-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .skills-container {
        grid-template-columns: 1fr;
    }

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

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

    .hero-stats {
        gap: 32px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .contact-form {
        padding: 24px;
    }
}