:root {
    /* Color Palette - Light Theme */
    --bg: #FAFAFA;
    --surface: #FFFFFF;
    --text-primary: #111111;
    --text-secondary: #666666;
    --text-tertiary: #A3A3A3;
    --border: #E5E5E5;
    --accent: #000000;
    --accent-glow: rgba(0, 0, 0, 0.04);

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

    /* Animation & Layout */
    --transition-fast: 0.2s ease;
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --max-width: 900px;
}

[data-theme="dark"] {
    /* Color Palette - Dark Theme */
    --bg: #0A0A0A;
    --surface: #121212;
    --text-primary: #EDEDED;
    --text-secondary: #A1A1AA;
    --text-tertiary: #52525B;
    --border: #27272A;
    --accent: #FFFFFF;
    --accent-glow: rgba(255, 255, 255, 0.05);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Texture */
.noise-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.04;
    background-image: url('data:image/svg+xml;utf8,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noiseFilter)"/%3E%3C/svg%3E');
}

[data-theme="dark"] .noise-bg {
    opacity: 0.02;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.italic-serif {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 400;
    letter-spacing: 0;
}

::selection {
    background: var(--text-primary);
    color: var(--bg);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.0);
    transition: border-bottom var(--transition-fast), background var(--transition-fast), padding var(--transition-fast);
}

.navbar.scrolled {
    background: rgba(250, 250, 250, 0.85);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(10, 10, 10, 0.85);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-weight: 600;
    font-size: 1.1rem;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.brand img {
    filter: brightness(0);
    transition: filter var(--transition-fast);
}

[data-theme="dark"] .brand img {
    filter: brightness(0) invert(1);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0;
    transition: color var(--transition-fast);
}

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

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: color var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--text-primary);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

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

/* Layout container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 8rem 1.5rem 4rem;
}

/* Hero Section */
.hero {
    padding-top: 5rem;
    padding-bottom: 7rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    margin-bottom: 1.5rem;
    max-width: 14ch;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 50ch;
    margin-bottom: 3rem;
    line-height: 1.7;
}


/* About Layout */
.about-bottom {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.75rem;
    align-items: stretch;
}

.about-journey {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.about-photo {
    min-height: 0;
}

.about-photo img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center top;
    border-radius: 2px;
    border: 1px solid var(--border);
    opacity: 0.88;
    transition: opacity var(--transition-fast);
}

.about-photo img:hover {
    opacity: 1;
}

/* Grid Sections */
.grid-section {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 3rem;
    padding: 6rem 0;
    border-top: 1px solid var(--border);
    scroll-margin-top: 5rem;
}

.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    position: sticky;
    top: 6rem;
}

.text-content p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    max-width: 55ch;
    line-height: 1.7;
}

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

/* Project List */
.project-list {
    display: flex;
    flex-direction: column;
}

.project-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border);
    text-decoration: none;
    color: inherit;
}

.project-item:first-child {
    padding-top: 0;
}

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

.project-item:hover {
    background: none;
}

.project-info {
    max-width: 80%;
}

.project-title {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
    transition: color var(--transition-fast);
    font-weight: 500;
}

.project-item:hover .project-title {
    color: var(--text-primary);
}

.project-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

.project-meta {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, auto);
    gap: 0 2.25rem;
    margin-bottom: 1.75rem;
    justify-content: start;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-number {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 1;
}

.stat-label {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
}

/* Library Grid */
.library-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.column-title {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.clean-list {
    list-style: none;
}

.clean-list li {
    margin-bottom: 1.25rem;
}

.clean-list a {
    display: block;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    line-height: 1.5;
}

.clean-list a:hover {
    color: var(--text-primary);
}

.list-meta {
    display: block;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: 0.25rem;
}

/* Writing list — link type icons + arrows */
.writing-list a {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
}


.link-body {
    flex: 1;
}

.link-arrow {
    display: inline-block;
    font-size: 0.75em;
    color: var(--text-tertiary);
    margin-left: 0.2em;
    opacity: 0.5;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    transform: translate(0, 0);
}

.writing-list a:hover .link-arrow {
    opacity: 1;
    transform: translate(2px, -2px);
}

/* Connect */
.icon-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.icon-links a {
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    transition: color var(--transition-fast);
}

.icon-links a:hover {
    color: var(--text-primary);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

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

.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding-top: 6rem;
    }

    .grid-section {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 4rem 0;
    }

    .section-title {
        position: static;
        margin-bottom: 0.5rem;
    }

    .about-bottom {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, auto);
        gap: 1.25rem 2rem;
    }

    .project-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1.5rem 0;
    }

    .project-info {
        max-width: 100%;
    }

    .nav-links {
        gap: 1.25rem;
    }

    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-top: 2rem;
    }

    .nav-links a {
        display: none;
    }

    .nav-links .theme-toggle {
        display: flex;
    }
}