/* ============================================
   DIVINE SEBUKPOR — PREMIUM PORTFOLIO
   Design System: Modern Dual Theme
   ============================================ */

/* ─── CSS Custom Properties ─── */
:root {
    /* Dark Theme (Default) */
    --bg-primary: #09090B;
    --bg-surface: #111113;
    --bg-card: #18181B;
    --bg-hover: #1F1F23;
    --border: rgba(255,255,255,0.08);
    --border-hover: rgba(255,255,255,0.14);
    --text-primary: #FAFAFA;
    --text-secondary: #A1A1AA;
    --text-muted: #52525B;
    --accent: #059669;
    --accent-hover: #047857;
    --accent-glow: rgba(5,150,105,0.25);
    --success: #10B981;
    --error: #EF4444;

    /* Typography */
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 0.15s;
    --duration-base: 0.3s;
    --duration-slow: 0.5s;
    --duration-slower: 0.8s;

    /* Layout */
    --header-height: 72px;
    --container-max: 1200px;
    --container-padding: clamp(1.5rem, 5vw, 3rem);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #FFFFFF;
    --bg-surface: #F8FAFC;
    --bg-card: #F1F5F9;
    --bg-hover: #E2E8F0;
    --border: rgba(2, 6, 23, 0.08);
    --border-hover: rgba(2, 6, 23, 0.16);
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --accent: #059669;
    --accent-hover: #047857;
    --accent-glow: rgba(5,150,105,0.2);
    --success: #10B981;
    --error: #EF4444;
}

/* Mobile Menu - Light Theme Support */
[data-theme="light"] .mobile-menu {
    background: rgba(255, 255, 255, 0.98);
}

/* Header Scrolled - Light Theme */
[data-theme="light"] .header.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px) saturate(1.5);
    -webkit-backdrop-filter: blur(20px) saturate(1.5);
    box-shadow: 0 1px 0 var(--border);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 2rem);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    cursor: none;
}

@media (pointer: coarse) {
    body { cursor: auto; }
    .cursor, .cursor-follower { display: none !important; }
}

::selection {
    background: var(--accent);
    color: white;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--bg-card); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

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

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ─── Custom Cursor ─── */
.cursor {
    position: fixed;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    pointer-events: none;
    z-index: 10000;
    mix-blend-mode: difference;
    transition: transform var(--duration-fast) var(--ease-out), width var(--duration-fast), height var(--duration-fast);
    transform: translate(-50%, -50%);
}
.cursor.hover {
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1.5px solid var(--accent);
    mix-blend-mode: normal;
}
.cursor-follower {
    position: fixed;
    width: 32px;
    height: 32px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.15s ease-out, width 0.3s, height 0.3s, border-color 0.3s;
    transform: translate(-50%, -50%);
}
.cursor-follower.hover {
    width: 56px;
    height: 56px;
    border-color: var(--accent-glow);
}

/* ─── Scroll Progress ─── */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    z-index: 10001;
    background: transparent;
}
.scroll-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    transition: width 0.1s linear;
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

/* ─── Layout ─── */
.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-5xl) 0;
    position: relative;
}

.section-header {
    margin-bottom: var(--space-4xl);
    max-width: 640px;
}

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: var(--space-md);
    padding: 0.375rem 0.75rem;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
}

.section-eyebrow::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
}

.section-title {
    font-size: clamp(2rem, 4.5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.section-lead {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 560px;
}

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--duration-base) var(--ease-out);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    color: white;
    box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent) 100%);
    box-shadow: 0 8px 24px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    backdrop-filter: blur(8px);
}
.btn-secondary:hover {
    border-color: var(--border-hover);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-ghost:hover {
    background: rgba(255,255,255,0.04);
    border-color: var(--border-hover);
}

.btn-sm { padding: 0.625rem 1.25rem; font-size: 0.875rem; }
.btn-lg { padding: 1rem 2.25rem; font-size: 1rem; }

.btn .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    transform: scale(0);
    animation: ripple-effect 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-effect {
    to { transform: scale(4); opacity: 0; }
}

/* ─── Header ─── */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    transition: background var(--duration-base), backdrop-filter var(--duration-base), box-shadow var(--duration-base);
}

.header.scrolled {
    background: rgba(9,9,11,0.8);
    backdrop-filter: blur(20px) saturate(1.5);
    -webkit-backdrop-filter: blur(20px) saturate(1.5);
    box-shadow: 0 1px 0 var(--border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    z-index: 1002;
}

.logo-mark {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 700;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-link {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: color var(--duration-fast), background var(--duration-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 16px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: transform var(--duration-base) var(--ease-out);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    z-index: 1002;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-surface) 100%);
    border: 1px solid var(--border);
    color: var(--text-primary);
    margin-right: var(--space-md);
    transition: all var(--duration-base) var(--ease-out);
    position: relative;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.theme-toggle:hover {
    background: linear-gradient(135deg, var(--bg-hover) 0%, var(--bg-card) 100%);
    border-color: var(--border-hover);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.theme-toggle i {
    font-size: 1.125rem;
    transition: all var(--duration-base) var(--ease-out);
    animation: theme-pulse 2s ease-in-out infinite;
}

@keyframes theme-pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

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

.theme-toggle .fa-moon {
    display: block;
}

[data-theme="light"] .theme-toggle .fa-sun {
    display: block;
}

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

.menu-line {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--text-primary);
    transition: all var(--duration-base) var(--ease-out);
    border-radius: 2px;
}

.menu-toggle.active .menu-line:first-child {
    transform: rotate(45deg) translate(3px, 3px);
}
.menu-toggle.active .menu-line:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
}

.mobile-menu {
    position: fixed;
    inset: 0;
    background: rgba(9,9,11,0.98);
    backdrop-filter: blur(30px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-slow) var(--ease-out);
}

.mobile-menu.active {
    opacity: 1;
    pointer-events: all;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
}

.mobile-nav-link {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--duration-base);
}
.mobile-nav-link:hover { color: var(--text-primary); }

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

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

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 40%, rgba(5,150,105,0.08) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 60%, rgba(5,150,105,0.04) 0%, transparent 50%);
}

/* Light Theme Hero Gradient */
[data-theme="light"] .hero-gradient {
    background:
        radial-gradient(ellipse 80% 60% at 20% 40%, rgba(5,150,105,0.06) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 60%, rgba(5,150,105,0.03) 0%, transparent 50%);
}

.hero-noise {
    position: absolute;
    inset: 0;
    opacity: 0.02;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 128px;
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: var(--space-4xl);
    align-items: center;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
}

.eyebrow-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    margin-bottom: var(--space-lg);
}

.hero-greeting {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.02em;
}

.hero-name {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.hero-headline {
    font-family: var(--font-display);
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 500;
    color: var(--accent);
    margin-bottom: var(--space-lg);
}

.hero-mission {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 480px;
    margin-bottom: var(--space-2xl);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    margin-top: clamp(1rem, 3vw, 2.5rem);
}

.portrait-frame {
    position: relative;
    width: 100%;
    max-width: 460px;
}

.portrait-border {
    position: absolute;
    inset: -2px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--accent), transparent 50%, rgba(5,150,105,0.3));
    opacity: 0.5;
    z-index: 0;
}

.portrait-image-wrapper {
    position: relative;
    z-index: 1;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border);
}

.portrait-image {
    width: 100%;
    height: auto;
    aspect-ratio: 4/5;
    object-fit: cover;
    object-position: center top;
    transition: transform var(--duration-slower) var(--ease-out);
    /* Prevent layout shift */
    min-height: 400px;
}

.portrait-frame:hover .portrait-image {
    transform: scale(1.03);
}

.portrait-glow {
    position: absolute;
    inset: -40px;
    background: radial-gradient(circle at center, var(--accent-glow) 0%, transparent 70%);
    z-index: -1;
    opacity: 0.6;
    pointer-events: none;
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    width: 100%;
    max-width: 460px;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
    transition: border-color var(--duration-base), transform var(--duration-base);
}

.metric-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.metric-value, .metric-suffix {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.metric-suffix { color: var(--accent); }

.metric-label {
    display: block;
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: var(--font-display);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--accent);
    animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
    0% { top: -100%; }
    50% { top: 0%; }
    100% { top: 100%; }
}

/* ─── About / Bento Grid ─── */
.about { background: var(--bg-primary); }

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.bento-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: border-color var(--duration-base), transform var(--duration-base), box-shadow var(--duration-base);
    position: relative;
    overflow: hidden;
}

.bento-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0;
    transition: opacity var(--duration-base);
}

.bento-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

/* Light Theme Card Shadow */
[data-theme="light"] .bento-card:hover {
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

.bento-card:hover::before { opacity: 1; }

.bento-large {
    grid-column: span 2;
    grid-row: span 2;
}

.bento-wide { grid-column: span 2; }
.bento-full { grid-column: span 3; }

.bento-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(5,150,105,0.1) 0%, rgba(5,150,105,0.05) 100%);
    color: var(--accent);
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    margin-bottom: var(--space-lg);
    border: 1px solid rgba(5,150,105,0.15);
    box-shadow: 0 4px 12px rgba(5,150,105,0.08);
}

/* Light Theme Bento Icon */
[data-theme="light"] .bento-icon {
    background: linear-gradient(135deg, rgba(5,150,105,0.08) 0%, rgba(5,150,105,0.03) 100%);
    box-shadow: 0 4px 12px rgba(5,150,105,0.06);
}

.bento-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.bento-text {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.value-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.value-marker {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.expertise-item {
    text-align: left;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
    position: relative;
    overflow: hidden;
    transition: transform var(--duration-base) var(--ease-out),
                border-color var(--duration-base),
                background var(--duration-base),
                box-shadow var(--duration-base);
}

[data-theme="light"] .expertise-item {
    background: rgba(2, 6, 23, 0.025);
}

.expertise-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0;
    transition: opacity var(--duration-base);
}

.expertise-item:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.055);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.18);
}

[data-theme="light"] .expertise-item:hover {
    background: rgba(2, 6, 23, 0.045);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.08);
}

.expertise-item:hover::before { opacity: 1; }

.expertise-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(5,150,105,0.08) 0%, rgba(5,150,105,0.03) 100%);
    color: var(--accent);
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
    margin: 0 0 var(--space-md);
    border: 1px solid rgba(5,150,105,0.12);
    transition: all var(--duration-base) var(--ease-out);
    box-shadow: 0 4px 16px rgba(5,150,105,0.06);
}

/* Light Theme Expertise Icon */
[data-theme="light"] .expertise-icon {
    background: linear-gradient(135deg, rgba(5,150,105,0.06) 0%, rgba(5,150,105,0.02) 100%);
    box-shadow: 0 4px 16px rgba(5,150,105,0.04);
}

.expertise-item:hover .expertise-icon {
    background: linear-gradient(135deg, rgba(5,150,105,0.15) 0%, rgba(5,150,105,0.08) 100%);
    transform: scale(1.08) rotate(5deg);
    box-shadow: 0 8px 24px rgba(5,150,105,0.12);
}

.expertise-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.expertise-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ─── Experience ─── */
.experience { background: var(--bg-surface); }

.experience-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.exp-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: border-color var(--duration-base), transform var(--duration-base);
    position: relative;
    overflow: hidden;
}

.exp-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--accent);
    opacity: 0;
    transition: opacity var(--duration-base);
}

.exp-card:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.exp-card:hover::before { opacity: 1; }

.exp-header { margin-bottom: var(--space-md); }

.exp-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.exp-period {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.exp-badge {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--success);
    background: rgba(16,185,129,0.1);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.exp-role {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.exp-company {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.exp-summary {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.exp-details {
    overflow: hidden;
    transition: max-height var(--duration-slow) var(--ease-out), opacity var(--duration-base);
    max-height: 0;
    opacity: 0;
}

.exp-details.open {
    max-height: 600px;
    opacity: 1;
}

.exp-achievements {
    margin-bottom: var(--space-lg);
}

.exp-achievements li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.exp-achievements li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

.exp-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tech-tag {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-hover);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
}

.exp-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    transition: color var(--duration-fast);
}

.exp-toggle:hover { color: var(--accent-hover); }

.exp-toggle i {
    transition: transform var(--duration-base) var(--ease-spring);
}

.exp-toggle[aria-expanded="true"] i {
    transform: rotate(180deg);
}

/* ─── Projects ─── */
.projects { background: var(--bg-primary); }

.projects-filter {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    transition: all var(--duration-base) var(--ease-out);
}

.filter-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--bg-card);
}

.filter-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 0 16px var(--accent-glow);
}

.projects-showcase {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.showcase-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--duration-base), transform var(--duration-base), box-shadow var(--duration-base);
    display: flex;
    flex-direction: column;
}

.showcase-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-6px);
    box-shadow: 0 24px 48px rgba(0,0,0,0.4);
}

/* Light Theme Card Shadow */
[data-theme="light"] .showcase-card:hover {
    box-shadow: 0 24px 48px rgba(0,0,0,0.12);
}

.showcase-visual {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.showcase-image-wrapper {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-card);
}

.showcase-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slower) var(--ease-out);
    /* Prevent layout shift */
    min-height: 200px;
}

.showcase-card:hover .showcase-image {
    transform: scale(1.08);
}

.showcase-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(9,9,11,0.95) 0%, rgba(9,9,11,0.4) 50%, transparent 100%);
    opacity: 0;
    transition: opacity var(--duration-base);
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    padding: var(--space-lg);
    gap: var(--space-sm);
}

.showcase-card:hover .showcase-overlay {
    opacity: 1;
}

.showcase-actions {
    display: flex;
    gap: var(--space-sm);
    transform: translateY(12px);
    transition: transform var(--duration-base) var(--ease-out);
}

.showcase-card:hover .showcase-actions {
    transform: translateY(0);
}

.showcase-content {
    padding: var(--space-xl);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.showcase-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.showcase-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    background: rgba(59,130,246,0.1);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
}

.showcase-accuracy {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--success);
}

.accuracy-ring {
    width: 28px;
    height: 28px;
    transform: rotate(-90deg);
}

.accuracy-ring .ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 3;
}

.accuracy-ring .ring-progress {
    fill: none;
    stroke: var(--success);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.5s var(--ease-out);
}

.showcase-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.showcase-problem,
.showcase-solution {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
}

.showcase-problem strong,
.showcase-solution strong {
    color: var(--text-primary);
    font-weight: 600;
}

.showcase-metrics {
    display: flex;
    gap: var(--space-lg);
    margin: var(--space-lg) 0;
    padding: var(--space-md) 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.s-metric {
    text-align: center;
}

.s-metric-value {
    display: block;
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.s-metric-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 4px;
}

.showcase-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: auto;
}

.stack-tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg-hover);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
}

/* ─── Research ─── */
.research { background: var(--bg-surface); }

.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.research-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
    transition: border-color var(--duration-base), transform var(--duration-base);
}

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

/* Light Theme Research Card */
[data-theme="light"] .research-number {
    color: rgba(0,0,0,0.03);
}

.research-number {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: rgba(255,255,255,0.03);
    line-height: 1;
    pointer-events: none;
}

.research-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59,130,246,0.1);
    color: var(--accent);
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    margin-bottom: var(--space-lg);
    border: 1px solid rgba(59,130,246,0.15);
}

.research-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.research-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ─── Awards ─── */
.awards { background: var(--bg-primary); }

.awards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.award-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    transition: border-color var(--duration-base), transform var(--duration-base);
}

.award-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
}

.award-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59,130,246,0.1);
    color: var(--accent);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    flex-shrink: 0;
    border: 1px solid rgba(59,130,246,0.15);
}

.award-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.award-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ─── Publications ─── */
.publications { background: var(--bg-surface); }

.pub-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    position: relative;
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
}

.pub-accent {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--success));
}

.pub-journal {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.pub-journal-name {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.pub-year {
    font-size: 0.8125rem;
    color: var(--text-muted);
    font-weight: 500;
}

.pub-title {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.pub-authors {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: var(--space-xl);
}

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

.pub-authors sup {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-left: 2px;
}

.pub-abstract {
    display: grid;
    gap: var(--space-lg);
    max-height: 200px;
    overflow: hidden;
    position: relative;
    transition: max-height var(--duration-slow) var(--ease-out);
}

.pub-abstract.expanded {
    max-height: 2000px;
}

.pub-abstract:not(.expanded)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(to bottom, transparent, var(--glass-bg) 70%);
    pointer-events: none;
}

.abstract-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.abstract-section p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.abstract-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

.pub-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    transition: color var(--duration-fast);
}

.pub-toggle:hover { color: var(--accent-hover); }

.pub-toggle i {
    transition: transform var(--duration-base) var(--ease-spring);
}

.pub-toggle[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.pub-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

.pub-doi {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.doi-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.doi-code {
    font-family: 'SF Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    background: var(--bg-hover);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.pub-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ─── DAS MedHub ─── */
.das { background: var(--bg-primary); }

.das-hero {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
    margin-bottom: var(--space-5xl);
}

.das-visual {
    position: relative;
}

.das-image-wrapper {
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-card);
    box-shadow: 0 32px 64px rgba(0,0,0,0.4);
    /* Prevent layout shift */
    min-height: 300px;
}

.das-image {
    width: 100%;
    height: auto;
    display: block;
}

.das-float-stats {
    position: absolute;
    bottom: -24px;
    right: -24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    gap: var(--space-xl);
    box-shadow: 0 16px 32px rgba(0,0,0,0.3);
    backdrop-filter: blur(10px);
}

.f-stat {
    text-align: center;
}

.f-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.f-stat-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 4px;
}

.das-content {
    padding-left: var(--space-xl);
}

.das-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.das-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.das-lead {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}

.das-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-3xl);
    margin-bottom: var(--space-4xl);
}

.das-feature-row {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-3xl);
    align-items: center;
}

.das-feature-row.reverse {
    direction: rtl;
}

.das-feature-row.reverse > * {
    direction: ltr;
}

.das-feature-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-image-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--accent);
    transition: border-color var(--duration-base), box-shadow var(--duration-base);
}

.feature-image-placeholder:hover {
    border-color: var(--accent);
    box-shadow: 0 0 30px var(--accent-glow);
}

.das-feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.das-feature-text {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.das-cta {
    text-align: center;
    padding: var(--space-4xl);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.das-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.das-cta-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.das-cta-text {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

/* ─── Contact ─── */
.contact { background: var(--bg-surface); }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: var(--space-4xl);
    align-items: start;
}

.contact-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.5rem 1rem;
    background: rgba(16,185,129,0.1);
    border: 1px solid rgba(16,185,129,0.2);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xl);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--success);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
    animation: pulse-dot 2s ease-in-out infinite;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--duration-base), transform var(--duration-base);
}

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

.contact-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59,130,246,0.1);
    color: var(--accent);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    flex-shrink: 0;
    border: 1px solid rgba(59,130,246,0.15);
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.contact-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

.contact-social {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.social-label {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-item {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1.125rem;
    transition: all var(--duration-base) var(--ease-out);
}

.social-item:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--accent-glow);
}

.contact-form-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--text-primary);
    transition: border-color var(--duration-base), box-shadow var(--duration-base);
    outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.btn-submit {
    width: 100%;
}

/* ─── Footer ─── */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: var(--space-4xl) 0 var(--space-xl);
}

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

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-4xl);
    margin-bottom: var(--space-3xl);
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: white;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.footer-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 320px;
}

.footer-title {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    transition: color var(--duration-fast);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all var(--duration-base);
}

.footer-social a:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

/* ─── Back to Top ─── */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: 1rem;
    z-index: 999;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--duration-base) var(--ease-out);
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.back-to-top:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

/* ─── Scroll Reveal Animations ─── */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--duration-slower) var(--ease-out), transform var(--duration-slower) var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ─── Stagger Children ─── */
.stagger-children > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.4s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.5s; opacity: 1; transform: translateY(0); }

/* ─── Responsive ─── */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-3xl);
    }
    .hero-content { order: 2; }
    .hero-visual { order: 1; }
    .hero-mission { margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }
    .hero-metrics { max-width: 100%; }
    .portrait-frame { max-width: 360px; margin: 0 auto; }

    .bento-grid { grid-template-columns: repeat(2, 1fr); }
    .bento-large { grid-column: span 2; grid-row: span 1; }
    .bento-wide { grid-column: span 2; }
    .bento-full { grid-column: span 2; }
    .expertise-grid { grid-template-columns: repeat(2, 1fr); }

    .projects-showcase { grid-template-columns: 1fr; }
    .research-grid { grid-template-columns: 1fr; }
    .awards-grid { grid-template-columns: repeat(2, 1fr); }

    .das-hero { grid-template-columns: 1fr; text-align: center; }
    .das-content { padding-left: 0; }
    .das-float-stats { right: 50%; transform: translateX(50%); }
    .das-feature-row { grid-template-columns: 1fr; gap: var(--space-xl); }
    .das-feature-row.reverse { direction: ltr; }
    .feature-image-placeholder { max-width: 300px; margin: 0 auto; }

    .contact-grid { grid-template-columns: 1fr; }
    
    /* Improved tablet responsiveness */
    .hero-name { font-size: clamp(2rem, 5vw, 3.5rem); }
    .hero-mission { max-width: 100%; }
    .showcase-card { max-width: 100%; }
}

@media (max-width: 768px) {
    :root { --header-height: 64px; }

    .nav { display: none; }
    .menu-toggle { display: flex; }

    .section { padding: var(--space-4xl) 0; }
    .section-header { margin-bottom: var(--space-3xl); }

    .hero-metrics { grid-template-columns: repeat(2, 1fr); }
    .hero-scroll { display: none; }

    .bento-grid { grid-template-columns: 1fr; }
    .bento-large,
    .bento-wide,
    .bento-full { grid-column: span 1; }
    .values-grid { grid-template-columns: 1fr; }
    .expertise-grid { grid-template-columns: 1fr; }

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

    .pub-footer { flex-direction: column; align-items: flex-start; }
    .pub-actions { width: 100%; }
    .pub-actions .btn { flex: 1; justify-content: center; }

    .footer-main { grid-template-columns: 1fr; gap: var(--space-2xl); }
    .footer-bottom { flex-direction: column; text-align: center; }
    
    /* Improved mobile responsiveness */
    .container { padding-left: var(--space-md); padding-right: var(--space-md); }
    .section-container { padding: 0 var(--space-md); }
    .showcase-image-wrapper { width: 100%; }
    .showcase-image { width: 100%; height: auto; }
    .das-image-wrapper { width: 100%; }
    .das-image { width: 100%; height: auto; }
    
    /* Better mobile card spacing */
    .bento-card, .exp-card, .research-card, .award-card {
        padding: var(--space-lg);
    }
    
    /* Optimize font sizes for mobile */
    .section-title { font-size: clamp(1.5rem, 4vw, 2.5rem); }
    .bento-title, .research-title { font-size: 1.125rem; }
}

@media (max-width: 480px) {
    .hero-name { font-size: clamp(1.75rem, 8vw, 2.5rem); }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }

    .projects-filter { gap: var(--space-xs); flex-wrap: wrap; }
    .filter-btn { padding: 0.5rem 1rem; font-size: 0.8125rem; white-space: nowrap; }
    
    .metric-card { padding: var(--space-sm); }
    .metric-value { font-size: 1.25rem; }
    .metric-label { font-size: 0.75rem; }

    .das-float-stats {
        position: relative;
        bottom: auto;
        right: auto;
        transform: none;
        margin-top: var(--space-md);
        flex-direction: column;
        gap: var(--space-md);
    }

    .form-row { grid-template-columns: 1fr; }
    .contact-form-wrapper { padding: var(--space-lg); }
    
    /* Small screen optimizations */
    .section-title { font-size: clamp(1.5rem, 5vw, 2rem); }
    .bento-title { font-size: 1.125rem; }
    .showcase-title { font-size: 1.125rem; }
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal,
    .stagger-children > * {
        opacity: 1 !important;
        transform: none !important;
    }
    .cursor, .cursor-follower { display: none !important; }
}

/* ─── Print ─── */
@media print {
    .header, .hero-scroll, .back-to-top, .cursor, .cursor-follower, .scroll-progress { display: none !important; }
    body { background: white; color: black; }
    .section { padding: 2rem 0; page-break-inside: avoid; }
}

/* ============================================
   ENHANCED GLASSMORPHISM (v2)
   Real frosted-glass surfaces: translucent fill +
   blur/saturate + inner highlight, instead of flat
   solid cards. Same accent/background palette throughout.
   ============================================ */
:root {
    --glass-bg: rgba(24, 24, 27, 0.55);
    --glass-bg-strong: rgba(9, 9, 11, 0.75);
    --glass-border: rgba(255, 255, 255, 0.10);
    --glass-highlight: rgba(255, 255, 255, 0.07);
    --glass-blur: blur(20px) saturate(1.6);
}

[data-theme="light"] {
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-bg-strong: rgba(255, 255, 255, 0.78);
    --glass-border: rgba(2, 6, 23, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.6);
}

.bento-card,
.exp-card,
.showcase-card,
.pub-card,
.award-card,
.research-card,
.metric-card,
.contact-method,
.das-float-stats,
.contact-form-wrapper,
.projects-filter {
    background: var(--glass-bg);
    border-color: var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: inset 0 1px 0 var(--glass-highlight), 0 8px 32px rgba(0, 0, 0, 0.14);
}

.header.scrolled,
.mobile-menu,
.btn-secondary {
    background: var(--glass-bg-strong);
}

.bento-card:hover,
.exp-card:hover,
.showcase-card:hover,
.metric-card:hover {
    box-shadow: inset 0 1px 0 var(--glass-highlight), 0 20px 40px rgba(0, 0, 0, 0.2);
}

/* Graceful fallback for the small number of browsers without backdrop-filter support */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .bento-card, .exp-card, .showcase-card, .pub-card, .award-card,
    .research-card, .metric-card, .contact-method, .das-float-stats,
    .contact-form-wrapper, .projects-filter,
    .header.scrolled, .mobile-menu, .btn-secondary {
        background: var(--bg-card);
    }
}

/* Blur is one of the more GPU-expensive properties on scroll; ease it back on
   small/low-power devices where jank is most noticeable and least affordable. */
@media (max-width: 640px) {
    :root { --glass-blur: blur(10px) saturate(1.4); }
}

/* ============================================
   HEADER LAYOUT FIX
   .header-actions had no layout rules at all, so on
   mobile (once the hamburger button appears next to
   the theme toggle) the two buttons had zero defined
   spacing/alignment between them.
   ============================================ */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ============================================
   MOBILE / TOUCH FIXES
   ============================================ */

/* Project card CTAs ("Live Demo" / "GitHub") were only ever shown on
   :hover, which doesn't exist on touch devices — meaning these buttons
   were effectively unreachable on phones and tablets. Keep them visible
   by default wherever there's no real hover capability. */
@media (hover: none), (pointer: coarse) {
    .showcase-overlay {
        opacity: 1;
        background: linear-gradient(to top, rgba(9,9,11,0.85) 0%, rgba(9,9,11,0.15) 65%, transparent 100%);
    }
    .showcase-actions {
        transform: translateY(0);
    }
    [data-theme="light"] .showcase-overlay {
        background: linear-gradient(to top, rgba(15,23,42,0.75) 0%, rgba(15,23,42,0.1) 65%, transparent 100%);
    }
}

/* Prevent metadata rows from clipping/overlapping on narrow cards */
.exp-meta,
.showcase-meta,
.pub-journal {
    flex-wrap: wrap;
    row-gap: var(--space-xs);
}

/* Small phones: tighten spacing further and protect the header from crowding */
@media (max-width: 380px) {
    .header-container { padding: 0 var(--space-sm); }
    .logo { font-size: 1rem; gap: var(--space-xs); }
    .logo-mark { width: 32px; height: 32px; font-size: 0.8125rem; }
    .logo-text { display: none; }

    .section-container, .hero-container { padding-left: var(--space-sm); padding-right: var(--space-sm); }
    .bento-card, .exp-card, .research-card, .award-card, .expertise-item, .metric-card {
        padding: var(--space-md);
    }
    .hero-metrics { grid-template-columns: repeat(2, 1fr); gap: var(--space-sm); }
    .das-float-stats { padding: var(--space-sm) var(--space-md); gap: var(--space-md); }
    .contact-form-wrapper { padding: var(--space-md); }
}