/* ── Design Tokens ─────────────────────────────────────────── */
:root {
    --bg: #09090b;
    --surface: #131316;
    --border: #1e1e24;
    --border-hover: #2e2e36;
    --text: #ececf0;
    --text-secondary: #9898a6;
    --text-dim: #5a5a66;
    --accent: #34d399;
    --accent-hover: #6ee7b7;
    --cat-hardware: #f59e0b;
    --cat-native: #a78bfa;
    --cat-ios: #60a5fa;
    --cat-web: #34d399;
    --cat-ai: #f472b6;
    --font: 'Inter', -apple-system, system-ui, sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

/* ── Nav ──────────────────────────────────────────────────── */
.nav {
    position: fixed;
    inset: 0 0 auto;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 56px;
    transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
    border-bottom: 1px solid transparent;
}

.nav.scrolled {
    background: rgba(9, 9, 11, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom-color: var(--border);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--mono);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: -0.02em;
    color: var(--text);
}

.nav-logo {
    height: 28px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.75rem;
}

.nav-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color 0.2s var(--ease);
}

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

.nav-github svg {
    width: 18px;
    height: 18px;
    fill: var(--text-secondary);
    vertical-align: middle;
    transition: fill 0.2s var(--ease);
}

.nav-github:hover svg { fill: var(--text); }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 640px;
}

.hero-logo {
    width: clamp(100px, 20vw, 160px);
    height: auto;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: clamp(3rem, 10vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
}

.hero-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    margin-top: 1.5rem;
    font-size: clamp(1rem, 2.5vw, 1.15rem);
    color: var(--text-secondary);
    font-weight: 400;
}

.hero-author {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-dim);
}

.hero-scroll {
    display: inline-block;
    margin-top: 3.5rem;
    color: var(--text-dim);
    transition: color 0.2s var(--ease);
}

.hero-scroll:hover { color: var(--text-secondary); }

.hero-scroll svg {
    width: 20px;
    height: 20px;
    animation: bob 2.5s ease-in-out infinite;
}

@keyframes bob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(5px); }
}

/* ── Projects ─────────────────────────────────────────────── */
.projects {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem 8rem;
}

.projects-header {
    margin-bottom: 3rem;
}

.projects-header h2 {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-dim);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

/* ── Card ─────────────────────────────────────────────────── */
.card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.75rem;
    transition: border-color 0.3s var(--ease),
                box-shadow 0.3s var(--ease),
                transform 0.3s var(--ease);
    opacity: 0;
    transform: translateY(16px);
}

.card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.5s ease-out,
                transform 0.5s ease-out,
                border-color 0.3s var(--ease),
                box-shadow 0.3s var(--ease);
}

.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.card.visible:hover {
    transform: translateY(-2px);
}

/* Category label */
.card-category {
    font-family: var(--mono);
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-category::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.card-category.hardware { color: var(--cat-hardware); }
.card-category.hardware::before { background: var(--cat-hardware); }

.card-category.native { color: var(--cat-native); }
.card-category.native::before { background: var(--cat-native); }

.card-category.ios { color: var(--cat-ios); }
.card-category.ios::before { background: var(--cat-ios); }

.card-category.web { color: var(--cat-web); }
.card-category.web::before { background: var(--cat-web); }

.card-category.ai { color: var(--cat-ai); }
.card-category.ai::before { background: var(--cat-ai); }

/* Title */
.card-title {
    font-family: var(--mono);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

/* Description */
.card-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

/* Tech tags */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 1.25rem;
}

.card-tags span {
    font-family: var(--mono);
    font-size: 0.65rem;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-dim);
}

/* Actions */
.card-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.4rem 0.85rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    transition: all 0.2s var(--ease);
}

.card-link:hover {
    color: var(--text);
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.03);
}

.card-link svg {
    width: 13px;
    height: 13px;
    fill: currentColor;
    flex-shrink: 0;
}

.card-link.primary {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
    font-weight: 600;
}

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

.card-link.primary svg { fill: var(--bg); }

.card-link.disabled {
    cursor: default;
    opacity: 0.4;
    pointer-events: none;
}

/* Badges */
.card-badge {
    position: absolute;
    top: 1.75rem;
    right: 1.75rem;
    font-family: var(--mono);
    font-size: 0.6rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
}

.badge-coming {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-dim);
}

.badge-live {
    background: rgba(52, 211, 153, 0.1);
    color: var(--accent);
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
    text-align: center;
    padding: 3rem 2rem;
    border-top: 1px solid var(--border);
}

.footer p {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    transition: color 0.2s var(--ease);
}

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

.footer-links svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    vertical-align: middle;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 820px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 500px) {
    .nav { padding: 0 1.25rem; }
    .projects { padding: 0 1.25rem 6rem; }
    .card { padding: 1.25rem; }

    .card-badge {
        top: 1.25rem;
        right: 1.25rem;
    }

    .hero-title {
        font-size: clamp(2.5rem, 12vw, 3.5rem);
    }
}