/* =================================
   CSS Variables & Theme System
   ================================= */

:root {
    /* Colors - Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #1a1a1a;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --accent-primary: #2563eb;
    --accent-secondary: #3b82f6;
    --accent-hover: #1d4ed8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --code-bg: #f1f5f9;
    --success: #10b981;
    --warning: #f59e0b;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-secondary: #60a5fa;
    --accent-hover: #2563eb;
    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --code-bg: #1e293b;
}

/* =================================
   Reset & Base Styles
   ================================= */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 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;
    }
}

/* =================================
   Typography
   ================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

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

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

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

/* =================================
   Container & Layout
   ================================= */

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

main {
    min-height: calc(100vh - 80px);
}

/* =================================
   Navigation
   ================================= */

.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    height: 80px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-favicon {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 0.25rem;
    flex-shrink: 0;
    transition: filter var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), padding var(--transition-fast);
}

:root:not([data-theme]) .logo-favicon,
[data-theme="light"] .logo-favicon {
    filter: none;
}

[data-theme="dark"] .logo-favicon {
    filter: none;
    background-color: #ffffff;
    padding: 2px;
    border: 1px solid rgba(148, 163, 184, 0.45);
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.25);
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

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

.nav-link.active {
    color: var(--accent-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--accent-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    position: relative;
    transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.menu-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.menu-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
}

.sun-icon,
.moon-icon {
    color: var(--text-primary);
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon,
:root:not([data-theme]) .moon-icon {
    display: none;
}

/* =================================
   Hero Section
   ================================= */

.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.name-highlight {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

.hero-bio {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

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




/* =================================
   Experience Logo Column (Hero)
   ================================= */

.hero-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: center;
    gap: var(--spacing-xl);
}

.hero-content {
    max-width: 760px;
}

.hero-logo-column {
    justify-self: end;
    width: min(220px, 100%);
}

.hero-logo-heading {
    display: none;
    margin-bottom: 0.45rem;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--text-tertiary);
}

.logo-carousel {
    width: 100%;
}

.logo-strip-track {
    width: 100%;
}

.logo-strip {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.55rem;
}

.logo-item {
    --logo-motion-x: 0px;
    --logo-motion-y: 0px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0.2rem 0.35rem;
    border-radius: var(--radius-sm);
    background: transparent;
    transform: translate3d(var(--logo-motion-x), var(--logo-motion-y), 0) scale(1);
    transition: transform 140ms ease-out, filter 220ms ease, opacity 180ms ease;
    opacity: 0.8;
    will-change: transform;
    backface-visibility: hidden;
}

.logo-item img {
    width: 100%;
    max-width: 180px;
    max-height: 38px;
    object-fit: contain;
    object-position: center;
    filter: saturate(0.9) contrast(1.02);
}

.logo-meta {
    position: absolute;
    left: calc(100% - 1.3rem);
    top: 50%;
    transform: translate3d(-4px, -50%, 0);
    min-width: 132px;
    max-width: 178px;
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease, transform 240ms cubic-bezier(0.22, 1, 0.36, 1);
    text-align: left;
    will-change: transform, opacity;
}

.logo-company {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

.logo-role {
    display: block;
    margin-top: 0.12rem;
    font-size: 0.66rem;
    font-weight: 500;
    line-height: 1.2;
    color: var(--text-secondary);
}

.logo-item:hover,
.logo-item:focus-visible {
    opacity: 1;
    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.15));
    transform: translate3d(calc(var(--logo-motion-x) + 4px), calc(var(--logo-motion-y) - 6px), 0) scale(1.08);
}

.logo-item:hover .logo-meta,
.logo-item:focus-visible .logo-meta {
    opacity: 1;
    transform: translate3d(0, -50%, 0);
}

[data-theme="dark"] .logo-item:hover,
[data-theme="dark"] .logo-item:focus-visible {
    filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.45));
}

@media (prefers-reduced-motion: reduce) {
    .logo-item,
    .logo-item:hover,
    .logo-item:focus-visible {
        transform: none;
    }

    .logo-strip-track.is-looping {
        animation: none !important;
    }
}

.recruiter-cta {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color);
}

.recruiter-cta-content {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    align-items: center;
    flex-wrap: wrap;
}

.recruiter-cta h2 {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-xs);
}

.recruiter-cta p {
    margin-bottom: 0;
}

.glance-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
}

.glance-list li {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
}

.current-research {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.current-research h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

/* =================================
   Buttons
   ================================= */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* =================================
   Sections
   ================================= */

section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.view-all {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.875rem;
    transition: gap var(--transition-fast);
}

.view-all:hover {
    gap: var(--spacing-md);
}

.page-header {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* =================================
   Focus Areas Grid
   ================================= */

.focus-areas {
    background-color: var(--bg-secondary);
}

.focus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.focus-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.focus-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.focus-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.focus-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.focus-card p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* =================================
   Projects Grid
   ================================= */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* =================================
   Glow Card Effect (Reusable)
   ================================= */

/*
   Two background layers keep content untouched:
   - layer 1 (padding-box): solid card background
   - layer 2 (border-box): animated conic gradient border
*/
.glow-card {
    --start: 220deg;
    --glow-opacity: 0.16;
    --glow-border-size: 1px;
    --glow-color-1: rgba(59, 130, 246, 0.95);
    --glow-color-2: rgba(34, 211, 238, 0.9);
    --glow-color-3: rgba(168, 85, 247, 0.85);
    position: relative;
    isolation: isolate;
    border: var(--glow-border-size) solid transparent;
    background:
        linear-gradient(var(--bg-primary), var(--bg-primary)) padding-box,
        conic-gradient(
            from var(--start),
            var(--glow-color-1),
            var(--glow-color-2),
            var(--glow-color-3),
            var(--glow-color-1)
        ) border-box;
}

/* Soft bloom rendered behind the card so interior colors do not shift */
.glow-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    pointer-events: none;
    z-index: -1;
    background: conic-gradient(
        from var(--start),
        var(--glow-color-1),
        var(--glow-color-2),
        var(--glow-color-3),
        var(--glow-color-1)
    );
    filter: blur(16px);
    opacity: calc(var(--glow-opacity) * 0.75);
    transition: opacity var(--transition-base);
}

.glow-card:hover,
.glow-card:focus-within {
    --glow-opacity: 0.3;
}

.project-card.glow-card:hover,
.focus-card.glow-card:hover {
    border-color: transparent;
}

[data-theme="dark"] .glow-card {
    --glow-opacity: 0.24;
}

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

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    flex: 1;
}

.project-card h3 a {
    color: var(--text-primary);
}

.project-card h3 a:hover {
    color: var(--accent-primary);
}

.project-badges {
    display: flex;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-featured {
    background-color: #dbeafe;
    color: #1e40af;
}

[data-theme="dark"] .badge-featured {
    background-color: #1e3a8a;
    color: #93c5fd;
}

.badge-fork {
    background-color: #fef3c7;
    color: #92400e;
}

[data-theme="dark"] .badge-fork {
    background-color: #78350f;
    color: #fde68a;
}

.project-summary {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.9375rem;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 500;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.875rem;
    margin-top: auto;
}

.project-link:hover {
    gap: var(--spacing-md);
}

/* =================================
   Projects Page Controls
   ================================= */

.projects-controls {
    margin-bottom: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.search-box {
    position: relative;
    width: 100%;
    max-width: 400px;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.filter-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.filter-btn.active {
    background-color: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.no-results {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-secondary);
}

/* =================================
   Project Detail Page
   ================================= */

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb span:last-child {
    color: var(--text-primary);
    font-weight: 500;
}

.project-detail {
    padding: var(--spacing-2xl) 0;
}

.project-header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.project-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.project-title-row h1 {
    flex: 1;
}

.fork-notice {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.fork-notice svg {
    flex-shrink: 0;
}

.project-summary {
    font-size: 1.125rem;
    line-height: 1.7;
}

.project-section {
    margin-bottom: var(--spacing-2xl);
}

.project-section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.highlight-list,
.bullet-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.highlight-list li {
    padding-left: var(--spacing-xl);
    position: relative;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.bullet-list li {
    padding-left: var(--spacing-xl);
    position: relative;
    color: var(--text-secondary);
    line-height: 1.7;
}

.bullet-list li::before {
    content: '•';
    position: absolute;
    left: var(--spacing-sm);
    color: var(--accent-primary);
    font-weight: 700;
}

.project-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

/* =================================
   About Page
   ================================= */

.about-content {
    padding-bottom: var(--spacing-3xl);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.about-story h2 {
    margin-bottom: var(--spacing-lg);
}

.narrative-text p {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.info-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.info-card-clickable {
    display: block;
    color: inherit;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.info-card-clickable:hover h3 {
    color: var(--accent-primary);
}

.info-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.info-card-link {
    color: inherit;
    text-decoration: none;
}

.info-card-link:hover {
    color: var(--accent-primary);
}

.info-item {
    margin-bottom: var(--spacing-lg);
}

.info-item:last-child {
    margin-bottom: 0;
}

.info-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.info-org {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

.info-period {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.info-coursework {
    margin-top: 0.45rem;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.info-coursework-toggle {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--accent-primary);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0;
    cursor: pointer;
}

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

.info-coursework-toggle:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

.language-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.language-item:last-child {
    border-bottom: none;
}

.language-name {
    font-weight: 500;
    color: var(--text-primary);
}

.language-prof {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.skills-section {
    margin-bottom: var(--spacing-3xl);
}

.skills-section h2 {
    margin-bottom: var(--spacing-xl);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.skill-group h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.skill-group--full {
    grid-column: 1 / -1;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

.about-cta {
    text-align: center;
    padding: var(--spacing-3xl);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
}

.about-cta h2 {
    margin-bottom: var(--spacing-md);
}

.about-cta p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* =================================
   Timeline Page
   ================================= */

.timeline-page {
    padding-top: var(--spacing-lg);
}

.timeline-main-centered {
    position: relative;
    max-width: 860px;
    margin: 0 auto;
}

.timeline-progress {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 120;
    background: rgba(148, 163, 184, 0.16);
    pointer-events: none;
}

.timeline-progress-bar {
    width: 100%;
    height: 100%;
    transform-origin: 0 50%;
    transform: scaleX(0);
    background: linear-gradient(90deg, #0ea5a4, #3b82f6, #14b8a6);
    box-shadow: 0 0 14px rgba(37, 99, 235, 0.35);
}

.timeline-ambient {
    position: absolute;
    inset: -70px -30px auto;
    height: 280px;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.timeline-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.34;
    transform: translate3d(0, 0, 0);
}

.timeline-orb-a {
    width: 210px;
    height: 210px;
    left: 8%;
    top: 20px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.38), transparent 68%);
    animation: orbDriftA 10s ease-in-out infinite alternate;
}

.timeline-orb-b {
    width: 190px;
    height: 190px;
    right: 12%;
    top: 32px;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.34), transparent 68%);
    animation: orbDriftB 12s ease-in-out infinite alternate;
}

.timeline-mini-heading {
    font-size: clamp(1.35rem, 3.2vw, 2.15rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--text-primary);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
}

.timeline-mini-heading::before {
    content: '';
    width: 30px;
    height: 4px;
    border-radius: 999px;
    background: linear-gradient(90deg, #0ea5a4, #3b82f6);
    box-shadow: 0 0 14px rgba(37, 99, 235, 0.35);
}

.timeline-scroll-cue {
    appearance: none;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: 999px;
    padding: 0.42rem 0.78rem;
    font-size: 0.78rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.42rem;
    margin-bottom: var(--spacing-xl);
    cursor: pointer;
    transition: opacity var(--transition-base), transform var(--transition-base), border-color var(--transition-fast);
    animation: cueFloat 1.5s ease-in-out infinite;
}

.timeline-scroll-cue:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.timeline-scroll-arrow {
    font-size: 0.9rem;
}

.timeline-scroll-cue.is-hidden {
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
}

.timeline-track {
    position: relative;
    display: grid;
    gap: var(--spacing-lg);
    padding-left: 2rem;
}

.timeline-track::before {
    content: '';
    position: absolute;
    left: 0.8rem;
    top: 0.3rem;
    bottom: 0.3rem;
    width: 2px;
    background: linear-gradient(to bottom, rgba(37, 99, 235, 0.3), rgba(37, 99, 235, 0.05));
    transform-origin: top;
    animation: lineGrow 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-entry {
    --tilt-x: 0deg;
    --tilt-y: 0deg;
    --lift: translateY(0);
    --entry-shift-x: 0px;
    --entry-shift-y: 18px;
    position: relative;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    opacity: 0;
    transform: perspective(980px) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) var(--lift) translate3d(var(--entry-shift-x), var(--entry-shift-y), 0);
    scroll-margin-top: 112px;
    transition:
        opacity 450ms ease var(--timeline-stagger),
        transform 420ms ease var(--timeline-stagger),
        box-shadow var(--transition-base),
        border-color var(--transition-base);
    will-change: transform;
}

.timeline-entry.is-visible {
    opacity: 1;
    transform: perspective(980px) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) var(--lift) translate3d(0, 0, 0);
}

.timeline-entry--from-left {
    --entry-shift-x: -24px;
    --entry-shift-y: 14px;
}

.timeline-entry--from-right {
    --entry-shift-x: 24px;
    --entry-shift-y: 14px;
}

.timeline-entry--from-center {
    --entry-shift-x: 0px;
    --entry-shift-y: 24px;
}

.timeline-entry:hover,
.timeline-entry.is-hovered {
    box-shadow: var(--shadow-lg);
    border-color: var(--timeline-accent);
}

.timeline-marker {
    position: absolute;
    left: -1.62rem;
    top: 1.48rem;
    width: 0.88rem;
    height: 0.88rem;
    border-radius: 50%;
    background: var(--timeline-accent);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.18);
}

.timeline-entry.is-targeted .timeline-marker {
    animation: markerPulse 1.15s ease;
}

@keyframes markerPulse {
    0% { transform: scale(1); }
    45% { transform: scale(1.35); }
    100% { transform: scale(1); }
}

@keyframes cueFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

@keyframes lineGrow {
    from { transform: scaleY(0.12); opacity: 0.3; }
    to { transform: scaleY(1); opacity: 1; }
}

@keyframes orbDriftA {
    from { transform: translate3d(-10px, -6px, 0) scale(1); }
    to { transform: translate3d(18px, 10px, 0) scale(1.08); }
}

@keyframes orbDriftB {
    from { transform: translate3d(8px, -8px, 0) scale(1); }
    to { transform: translate3d(-16px, 12px, 0) scale(1.1); }
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-1.5px) scale(1.01); }
}

@keyframes logoShimmer {
    from { transform: translateX(-130%) rotate(8deg); }
    to { transform: translateX(130%) rotate(8deg); }
}

.timeline-entry-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.timeline-logo-wrap {
    width: 3.25rem;
    height: 3.25rem;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: grid;
    place-items: center;
    flex-shrink: 0;
    overflow: hidden;
    position: relative;
}

.timeline-logo-wrap::after {
    content: '';
    position: absolute;
    inset: -45%;
    background: linear-gradient(115deg, transparent 35%, rgba(255, 255, 255, 0.32) 50%, transparent 65%);
    transform: translateX(-130%) rotate(8deg);
    opacity: 0;
}

.timeline-logo-wrap img {
    width: 92%;
    height: 92%;
    object-fit: contain;
    transform: translateY(0) scale(1);
    transition: transform 260ms ease, filter 240ms ease;
    animation: logoFloat 3.6s ease-in-out infinite;
}

.timeline-entry:hover .timeline-logo-wrap img,
.timeline-entry.is-hovered .timeline-logo-wrap img {
    transform: translateY(-2px) scale(1.06) rotate(-1.2deg);
    filter: saturate(1.07) contrast(1.04);
}

.timeline-entry:hover .timeline-logo-wrap::after,
.timeline-entry.is-hovered .timeline-logo-wrap::after {
    opacity: 1;
    animation: logoShimmer 900ms ease forwards;
}

.timeline-period {
    margin: 0 0 0.16rem;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--timeline-accent);
}

.timeline-entry h3 {
    font-size: 1.1rem;
    margin-bottom: 0.15rem;
}

.timeline-meta {
    margin-bottom: 0;
    color: var(--text-tertiary);
    font-size: 0.88rem;
}

.timeline-summary {
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.timeline-highlights {
    margin: 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 0.42rem;
}

.timeline-highlights li {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.timeline-empty {
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    text-align: center;
}

/* =================================
   404 Error
   ================================= */

.project-404 {
    padding: var(--spacing-3xl) 0;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.error-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.error-content h1 {
    font-size: 6rem;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
}

.error-content h2 {
    margin-bottom: var(--spacing-md);
}

.error-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.error-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* =================================
   Footer
   ================================= */

.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-content p {
    margin: 0;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.footer-logo-note {
    display: block;
    margin-top: 0.35rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

/* =================================
   Animations
   ================================= */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes logoStripLoop {
    from {
        transform: translateX(0);
    }
    to {
        transform: translateX(-50%);
    }
}

/* =================================
   Responsive Design
   ================================= */

@media (max-width: 768px) {
    html,
    body {
        overflow-x: clip;
    }

    :root {
        --container-padding: 1rem;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .hero-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .hero-layout > * {
        min-width: 0;
    }

    .hero-logo-column {
        justify-self: start;
        width: 100%;
        min-width: 0;
        overflow: hidden;
    }

    .hero-logo-heading {
        display: block;
        margin-bottom: 0.6rem;
        font-size: 0.74rem;
    }

    .logo-carousel {
        --mobile-logo-gap: 0.58rem;
        overflow: hidden;
        width: 100%;
        max-width: 100%;
        padding: 0.15rem 0;
        position: relative;
    }

    .logo-strip-track {
        display: flex;
        width: max-content;
    }

    .logo-strip-track.is-looping {
        animation: logoStripLoop 24s linear infinite;
    }

    .logo-strip {
        display: flex;
        flex-wrap: nowrap;
        width: max-content;
        gap: var(--mobile-logo-gap);
        padding-right: var(--mobile-logo-gap);
    }

    .logo-strip > li {
        flex: 0 0 auto;
        width: var(--logo-slot, 22%);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .logo-strip.is-clone .logo-item {
        pointer-events: none;
    }

    .logo-strip > li .logo-item {
        transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1), opacity 220ms ease;
    }

    .logo-strip > li.is-center .logo-item {
        transform: scale(1.26);
        opacity: 1;
    }

    .logo-item {
        min-height: 44px;
        width: 100%;
        border: none;
        background: transparent;
        padding: 0.1rem 0.2rem;
        opacity: 0.84;
    }

    .logo-item img {
        width: 100%;
        height: auto;
        max-width: 168px;
        max-height: 42px;
        object-fit: contain;
    }

    .logo-meta {
        display: none;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

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

    .recruiter-cta-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

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

    /* Mobile-only override for homepage featured projects section. */
    .featured-projects .projects-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--spacing-md);
    }

    .featured-projects .section-title {
        display: none;
    }

    .featured-projects .project-card {
        padding: var(--spacing-md);
    }

    .featured-projects .project-card h3 {
        font-size: 1rem;
    }

    .featured-projects .project-summary {
        font-size: 0.875rem;
    }

    .featured-projects .badge-featured {
        display: none;
    }

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

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

    .projects-controls {
        gap: var(--spacing-md);
    }

    .search-box {
        max-width: 100%;
    }

    .project-title-row {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .timeline-main-centered {
        max-width: 100%;
    }

    .timeline-ambient {
        inset: -40px -10px auto;
        height: 220px;
    }

    .timeline-scroll-cue {
        margin-bottom: var(--spacing-lg);
    }

    .timeline-mini-heading {
        gap: 0.55rem;
    }

    .timeline-mini-heading::before {
        width: 24px;
    }
}

@media (max-width: 480px) {
    .logo-item {
        min-height: 40px;
        padding: 0.08rem 0.15rem;
    }

    .logo-item img {
        max-width: 140px;
        max-height: 36px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .filter-group {
        width: 100%;
    }

    .filter-btn {
        flex: 1;
        text-align: center;
    }

    .timeline-track {
        padding-left: 1.65rem;
    }

    .timeline-marker {
        left: -1.35rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .timeline-orb,
    .timeline-scroll-cue,
    .timeline-track::before,
    .timeline-logo-wrap img,
    .timeline-logo-wrap::after {
        animation: none !important;
    }

    .timeline-entry,
    .timeline-entry.is-visible {
        transform: translateY(0) !important;
    }
}


.badge:not(.badge-featured):not(.badge-fork) {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.projects-hybrid-note {
    margin-top: calc(-1 * var(--spacing-sm));
    margin-bottom: var(--spacing-xl);
    color: var(--text-tertiary);
    font-size: 0.95rem;
}