/* === COHERENCY — Aurora v2 ===
   Style: Northern Lights
   Fonts: Instrument Sans (headings) + DM Sans (body)
   Palette: Deep night sky → aurora greens/teals/violets
   Approach: OKLCH colors, 4pt spacing, Impeccable motion rules
   ============================================ */

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

:root {
    /* Night sky palette — OKLCH, tinted neutrals */
    --sky-deep:     oklch(8% 0.015 260);
    --sky-mid:      oklch(12% 0.012 260);
    --sky-surface:  oklch(16% 0.01 260);
    --sky-elevated: oklch(20% 0.01 260);
    --border:       oklch(24% 0.01 260);
    --border-hover: oklch(32% 0.015 260);

    /* Text */
    --text:         oklch(95% 0.005 260);
    --text-soft:    oklch(70% 0.008 260);
    --text-muted:   oklch(50% 0.008 260);

    /* Aurora colors */
    --aurora-ice:    oklch(85% 0.08 210);
    --aurora-blue:   oklch(70% 0.14 225);
    --aurora-violet: oklch(60% 0.15 260);
    --aurora-white:  oklch(95% 0.02 210);

    /* Accent — aurora ice-blue */
    --accent:       oklch(80% 0.10 215);
    --accent-soft:  oklch(80% 0.10 215 / 0.15);

    /* Typography */
    --font-heading: 'Instrument Sans', system-ui, sans-serif;
    --font-body:    'DM Sans', system-ui, sans-serif;

    /* Motion — Impeccable defaults */
    --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);
    --ease-quart:   cubic-bezier(0.25, 1, 0.5, 1);
    --duration-fast: 150ms;
    --duration-med:  300ms;
    --duration-slow: 500ms;

    /* Spacing — 4pt base */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-12: 48px;
    --space-16: 64px;
    --space-24: 96px;

    --radius: 12px;
    --max-w: 1100px;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--sky-deep);
    color: var(--text);
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ===================== AURORA BACKGROUND ===================== */

.aurora-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    width: 100%;
    height: 100%;
}

.aurora-stars {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        radial-gradient(1px 1px at 10% 15%, oklch(90% 0.005 260 / 0.7), transparent),
        radial-gradient(1.2px 1.2px at 25% 8%, oklch(85% 0.005 260 / 0.5), transparent),
        radial-gradient(1.5px 1.5px at 40% 22%, oklch(95% 0.005 260 / 0.8), transparent),
        radial-gradient(1px 1px at 55% 5%, oklch(80% 0.005 260 / 0.4), transparent),
        radial-gradient(1.3px 1.3px at 70% 18%, oklch(90% 0.005 260 / 0.6), transparent),
        radial-gradient(1.5px 1.5px at 85% 12%, oklch(88% 0.005 260 / 0.5), transparent),
        radial-gradient(1px 1px at 15% 35%, oklch(85% 0.005 260 / 0.4), transparent),
        radial-gradient(1.2px 1.2px at 60% 30%, oklch(90% 0.005 260 / 0.6), transparent),
        radial-gradient(1px 1px at 92% 28%, oklch(80% 0.005 260 / 0.4), transparent),
        radial-gradient(1px 1px at 33% 42%, oklch(85% 0.005 260 / 0.3), transparent),
        radial-gradient(1.3px 1.3px at 78% 38%, oklch(90% 0.005 260 / 0.5), transparent),
        radial-gradient(1.5px 1.5px at 48% 45%, oklch(92% 0.005 260 / 0.4), transparent),
        radial-gradient(1px 1px at 5% 50%, oklch(88% 0.005 260 / 0.3), transparent),
        radial-gradient(1.2px 1.2px at 22% 55%, oklch(85% 0.005 260 / 0.4), transparent),
        radial-gradient(1px 1px at 65% 48%, oklch(90% 0.005 260 / 0.3), transparent),
        radial-gradient(1.5px 1.5px at 88% 42%, oklch(92% 0.005 260 / 0.5), transparent);
}

/* ===================== NAV ===================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6) var(--space-12);
    transition: padding var(--duration-med) var(--ease-quart),
                background var(--duration-med) var(--ease-quart);
}

.nav.scrolled {
    padding: var(--space-4) var(--space-12);
    background: oklch(8% 0.015 260 / 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.01em;
    transition: color var(--duration-fast) var(--ease-quart);
}

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

.nav-links {
    display: flex;
    gap: var(--space-8);
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.04em;
    transition: color var(--duration-fast) var(--ease-quart);
}

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

/* ===================== HERO ===================== */

.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-16) var(--space-12);
}

.hero-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.hero-eyebrow {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    animation: fadeIn 1s var(--ease-out) 0.2s both;
}

.hero-name {
    font-family: var(--font-heading);
    font-size: clamp(48px, 10vw, 140px);
    font-weight: 700;
    line-height: 0.9;
    letter-spacing: -0.03em;
    color: var(--text);
    background: linear-gradient(
        180deg,
        oklch(96% 0.005 220) 0%,
        oklch(78% 0.06 215) 100%
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeIn 1s var(--ease-out) 0.4s both;
}

.hero-desc {
    font-family: var(--font-body);
    font-size: 17px;
    font-weight: 300;
    color: var(--text-soft);
    margin-top: var(--space-2);
    animation: fadeIn 1s var(--ease-out) 0.6s both;
}

.scroll-hint {
    position: absolute;
    bottom: var(--space-12);
    left: 50%;
    transform: translateX(-50%);
    animation: fadeIn 1s var(--ease-out) 1.2s both;
}

.scroll-line {
    display: block;
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    animation: scrollPulse 2.5s var(--ease-quart) infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
    50% { opacity: 0.8; transform: scaleY(1); }
}

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

/* ===================== CONTENT SECTIONS ===================== */

.work,
.about {
    position: relative;
    z-index: 1;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: var(--space-24) var(--space-12);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.section-label {
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    flex-shrink: 0;
}

.section-line {
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* ===================== REPO GRID ===================== */

.repo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-3);
}

.repo-loading {
    grid-column: 1 / -1;
    padding: var(--space-8);
    color: var(--text-muted);
    font-size: 13px;
}

.repo-card {
    background: var(--sky-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-6);
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transition: background var(--duration-fast) var(--ease-quart),
                border-color var(--duration-fast) var(--ease-quart),
                transform var(--duration-med) var(--ease-out);
}

.repo-card:hover {
    background: var(--sky-elevated);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.repo-name {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.repo-desc {
    font-size: 13px;
    color: var(--text-soft);
    line-height: 1.5;
    flex-grow: 1;
}

.repo-meta {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-2);
    font-size: 12px;
    color: var(--text-muted);
}

.repo-lang::before {
    content: '●  ';
    color: var(--accent);
    font-size: 9px;
}

.all-repos-link {
    display: inline-block;
    margin-top: var(--space-6);
    font-size: 13px;
    color: var(--text-muted);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color var(--duration-fast) var(--ease-quart);
}

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

/* ===================== ABOUT ===================== */

.about {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
    border-top: 1px solid var(--border);
}

.about-text {
    font-size: clamp(20px, 3vw, 32px);
    line-height: 1.4;
    font-weight: 400;
    max-width: 700px;
}

.about-muted {
    color: var(--text-muted);
}

.about-bright {
    color: var(--text);
}

/* ===================== FOOTER ===================== */

.footer {
    position: relative;
    z-index: 1;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: var(--space-8) var(--space-12);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border);
}

.footer-copy {
    font-size: 12px;
    color: var(--text-muted);
}

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

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 12px;
    transition: color var(--duration-fast) var(--ease-quart);
}

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

/* ===================== RESPONSIVE ===================== */

@media (max-width: 768px) {
    .nav {
        padding: var(--space-4) var(--space-6);
    }

    .nav.scrolled {
        padding: var(--space-3) var(--space-6);
    }

    .hero {
        padding: var(--space-16) var(--space-6);
    }

    .work,
    .about {
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }

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

    .footer {
        padding: var(--space-6);
        flex-direction: column;
        gap: var(--space-4);
    }

    .aurora-band {
        filter: blur(60px);
    }
}

/* ===================== REDUCED MOTION ===================== */

@media (prefers-reduced-motion: reduce) {
    .aurora-band {
        animation: none;
        opacity: 0.3;
    }

    .scroll-line {
        animation: none;
        opacity: 0.5;
    }

    .hero-name,
    .hero-eyebrow,
    .hero-desc {
        animation: none;
        opacity: 1;
    }

    .scroll-hint {
        animation: none;
        opacity: 1;
    }
}