/* ============================================
   Design System: Editorial Minimalism
   Typography-driven, refined, architectural
   ============================================ */

/* Custom Properties */
:root {
    /* Colors - Dark theme primary */
    --color-bg: #0a0a0b;
    --color-bg-elevated: #111113;
    --color-bg-subtle: #18181b;
    --color-border: #27272a;
    --color-border-subtle: #1f1f23;

    --color-text: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;

    --color-accent: #ea580c;
    --color-accent-hover: #f97316;
    --color-accent-subtle: rgba(234, 88, 12, 0.1);

    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;
    --text-6xl: 4.5rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Layout */
    --max-width: 1200px;
    --content-width: 680px;

    /* Effects */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.6);

    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Light theme override */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg: #fafafa;
        --color-bg-elevated: #ffffff;
        --color-bg-subtle: #f4f4f5;
        --color-border: #e4e4e7;
        --color-border-subtle: #f4f4f5;

        --color-text: #18181b;
        --color-text-secondary: #52525b;
        --color-text-muted: #a1a1aa;

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
        --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    }
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

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

button {
    font-family: inherit;
    cursor: pointer;
}

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

/* Grain overlay */
.grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    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");
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-5) var(--space-8);
    background: linear-gradient(to bottom, var(--color-bg) 0%, transparent 100%);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 400;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--space-6);
}

.nav-link {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

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

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

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

.btn-secondary:hover {
    background-color: var(--color-bg-subtle);
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: var(--space-20) var(--space-8);
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
}

.hero-content {
    max-width: 540px;
}

.hero-title {
    margin-bottom: var(--space-6);
}

.hero-greeting {
    display: block;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-2);
}

.hero-name {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(var(--text-4xl), 8vw, var(--text-6xl));
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-8);
    max-width: 440px;
}

.hero-links {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

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

.hero-shape {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--color-accent) 0%, transparent 70%);
    opacity: 0.15;
    filter: blur(60px);
    animation: float 8s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

/* About Section */
.about {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-12);
    padding: var(--space-24) var(--space-8);
    max-width: var(--max-width);
    margin: 0 auto;
    border-top: 1px solid var(--color-border-subtle);
}

.about-label {
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.about-content {
    max-width: var(--content-width);
}

.about-content p {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-6);
}

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

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-8);
}

.section-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 400;
    letter-spacing: -0.02em;
}

.section-link {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.section-link:hover {
    color: var(--color-accent);
}

/* Utilities Preview */
.utilities-preview {
    padding: var(--space-24) var(--space-8);
    max-width: var(--max-width);
    margin: 0 auto;
}

.utility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-6);
}

.utility-card {
    position: relative;
    display: block;
    padding: var(--space-8);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.utility-card:hover {
    border-color: var(--color-border);
    background-color: var(--color-bg-subtle);
    transform: translateY(-2px);
}

.utility-card:hover .utility-arrow {
    transform: translateX(4px);
    color: var(--color-accent);
}

.utility-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-accent-subtle);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    margin-bottom: var(--space-5);
}

.utility-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 400;
    margin-bottom: var(--space-3);
}

.utility-desc {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.utility-arrow {
    position: absolute;
    top: var(--space-8);
    right: var(--space-8);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border-subtle);
    padding: var(--space-8);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

/* Responsive */
@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: var(--space-24);
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-subtitle {
        max-width: 100%;
    }

    .hero-links {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .about {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
}

@media (max-width: 640px) {
    :root {
        --space-8: 1.5rem;
    }

    .nav {
        padding: var(--space-4) var(--space-5);
    }

    .hero {
        min-height: auto;
        padding-top: var(--space-20);
        padding-bottom: var(--space-16);
    }

    .hero-name {
        font-size: var(--text-4xl);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}