/* ============================================================
   16-bit MIPS (VHDL) — Apple-style Dual Theme (Dark / Light)
   Premium glass-like interface • Emerald–Cyan Accents
   ============================================================ */

/* === DARK THEME (default) === */
:root {
    --bg: #0c0f17;
    --surface: rgba(18, 22, 34, 0.85);
    --elevated: rgba(30, 35, 48, 0.9);
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: rgba(255,255,255,0.12);
    --accent1: #34d399; /* emerald */
    --accent2: #06b6d4; /* cyan */
    --highlight: #10b981;
    --shadow-soft: 0 6px 24px rgba(0,0,0,0.35);
    --shadow-strong: 0 14px 45px rgba(0,0,0,0.45);
    --blur: saturate(160%) blur(12px);
    --ease: cubic-bezier(.25,1,.5,1);
    --t: 0.5s var(--ease);
}

/* === LIGHT THEME === */
body.light {
    --bg: #f7fafc;
    --surface: rgba(255,255,255,0.85);
    --elevated: rgba(255,255,255,0.9);
    --text: #0f172a;
    --muted: #475569;
    --border: rgba(15,23,42,0.1);
    --accent1: #059669;
    --accent2: #0ea5e9;
    --highlight: #14b8a6;
    --shadow-soft: 0 6px 22px rgba(2,6,23,0.08);
    --shadow-strong: 0 18px 50px rgba(2,6,23,0.12);
    --blur: saturate(140%) blur(14px);
}

/* === GLOBAL BASE === */
* { box-sizing: border-box; }
html, body { height: 100%; scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    background-image:
            radial-gradient(1000px 600px at -10% -10%, color-mix(in srgb, var(--accent1) 12%, transparent), transparent),
            radial-gradient(800px 500px at 110% 0%, color-mix(in srgb, var(--accent2) 10%, transparent), transparent);
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.7;
    transition: background .7s var(--ease), color .5s var(--ease);
    -webkit-font-smoothing: antialiased;
}

/* === CONTAINERS & SECTIONS === */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section.soft { background: color-mix(in srgb, var(--surface) 40%, transparent); }
.section-title {
    margin: 0 0 24px;
    font-size: clamp(24px, 2vw + 10px, 36px);
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, var(--accent1), var(--accent2));
    -webkit-background-clip: text;
    color: transparent;
}

/* === HEADER / NAV === */
.site-header {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: var(--blur);
    background-color: color-mix(in srgb, var(--surface) 85%, transparent);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--t), border-color var(--t);
}
.nav {
    display: flex; justify-content: space-between; align-items: center;
    padding: 14px 0;
}
.brand {
    text-decoration: none;
    color: var(--text);
    font-weight: 800;
    letter-spacing: .3px;
    font-size: 1.1rem;
    transition: transform .4s var(--ease), text-shadow .4s var(--ease);
}
.brand:hover {
    transform: translateY(-1px);
    text-shadow: 0 0 20px color-mix(in srgb, var(--accent1) 50%, transparent);
}

/* === BUTTONS === */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: .5rem; padding: 10px 16px; border-radius: 12px;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    text-decoration: none;
    box-shadow: var(--shadow-soft);
    transition: all .45s var(--ease);
}
.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-strong);
    background: linear-gradient(90deg, var(--accent1), var(--accent2));
    color: #fff;
}
.btn.primary {
    background: linear-gradient(90deg, var(--accent1), var(--accent2));
    border: none;
    color: #fff;
}
.btn.primary:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 10px 30px color-mix(in srgb, var(--accent1) 45%, transparent);
}
.btn.ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}
.btn.ghost:hover {
    background: color-mix(in srgb, var(--accent2) 15%, transparent);
}
.btn.link {
    background: none;
    border: none;
    color: var(--accent2);
    text-decoration: underline;
    box-shadow: none;
}
.btn.link:hover { color: var(--accent1); text-decoration: none; }
.btn.subtle {
    background: color-mix(in srgb, var(--accent2) 10%, var(--surface));
    border: none;
    color: var(--text);
}
.btn.sm { padding: 8px 12px; font-size: .9rem; border-radius: 10px; }
.btn.xs { padding: 6px 10px; font-size: .8rem; border-radius: 8px; }

/* === HERO === */
.hero { position: relative; overflow: hidden; }
.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
    text-align: left;
}
.hero-copy h1 {
    margin: 0 0 10px;
    font-size: clamp(28px, 4vw, 46px);
    font-weight: 900;
    background: linear-gradient(90deg, var(--accent1), var(--accent2));
    -webkit-background-clip: text;
    color: transparent;
}
.hero-copy p {
    color: var(--muted);
    margin: 10px 0 24px;
    font-size: 1.05rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* === CARDS === */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 24px 20px;
    box-shadow: var(--shadow-soft);
    transition: all .5s var(--ease);
    position: relative;
    overflow: hidden;
}
.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-strong);
    background: linear-gradient(
            145deg,
            color-mix(in srgb, var(--surface), var(--accent1) 10%),
            color-mix(in srgb, var(--surface), var(--accent2) 8%)
    );
}
.card h3 {
    margin-top: 0;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--highlight);
}
.card p, .card li { color: var(--muted); font-size: 0.95rem; }

/* === ARCHITECTURE GRID === */
.arch {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}
.arch-card {
    background: var(--elevated);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 16px;
    transition: all .45s var(--ease);
    box-shadow: var(--shadow-soft);
}
.arch-card:hover {
    transform: translateY(-6px);
    background: linear-gradient(145deg, var(--accent1), var(--accent2));
    color: #fff;
    box-shadow: var(--shadow-strong);
}
.arch-card h4 { margin: 0 0 6px; font-weight: 700; }
.arch-card p { margin: 0; color: inherit; }

/* === GALLERY (if used) === */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 24px;
}
.gallery-card {
    border-radius: 14px;
    background: var(--surface);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-soft);
    text-align: center;
    padding: 20px;
}
.gallery-card img {
    width: 100%; height: auto;
    border-radius: 10px;
    transition: transform .4s var(--ease);
}
.gallery-card:hover img { transform: scale(1.03); }
.gallery-card figcaption {
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 8px;
}

/* === CODE BLOCKS === */
.code-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: transform .45s var(--ease), box-shadow .45s var(--ease);
}
.code-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-strong);
}
.code-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}
pre {
    margin: 0;
    padding: 18px;
    background: var(--elevated);
    color: var(--text);
    overflow: auto;
    max-height: 580px;
    font-size: 0.9rem;
    border-radius: 0 0 16px 16px;
}

/* === FOOTER === */
.site-footer {
    padding: 48px 0 32px;
    text-align: center;
    color: var(--muted);
    border-top: 1px solid var(--border);
    backdrop-filter: var(--blur);
}
.site-footer a {
    color: var(--accent2);
    text-decoration: none;
    transition: color .35s var(--ease);
}
.site-footer a:hover { color: var(--accent1); }

/* === UTILITIES === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}
.muted { color: var(--muted); }
a { color: var(--accent2); transition: color .3s var(--ease); }
a:hover { color: var(--accent1); }

/* === RESPONSIVE === */
@media (max-width: 960px) {
    .hero-grid { grid-template-columns: 1fr; }
}