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

:root {
    --bg: #0a0d12;
    --surface: #111520;
    --card: #151b27;
    --card-hover: #1a2235;
    --border: #1e2840;
    --border-light: #263350;
    --accent: #3affc0;
    --accent2: #4f9dff;
    --accent3: #ff6b6b;
    --accent4: #ffb347;
    --text: #e8edf5;
    --muted: #7a8ba6;
    --font-head: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'Courier New', monospace;
}

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.7;
    overflow-x: hidden;
}

/* ── NAV ── */
nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 4rem;
    background: rgba(10, 13, 18, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-logo {
    font-family: var(--font-head);
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
    color: var(--text);
    text-decoration: none;
}

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

.nav-links { display: flex; gap: 2rem; list-style: none; }

.nav-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 400;
    letter-spacing: 0.5px;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* ── PAGE HEADER ── */
.page-header {
    padding: 9rem 4rem 4rem;
    position: relative;
    overflow: hidden;
}

.page-header::after {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 50%; height: 100%;
    background: radial-gradient(ellipse at right, rgba(79,157,255,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.header-eyebrow {
    font-family: var(--font-head);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 1rem;
    opacity: 0;
    animation: fadeUp 0.6s 0.1s ease forwards;
}

.header-title {
    font-family: var(--font-head);
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -2.5px;
    line-height: 1;
    max-width: 700px;
    opacity: 0;
    animation: fadeUp 0.6s 0.25s ease forwards;
}

.header-title span { color: var(--accent2); }

.header-sub {
    font-size: 1.05rem;
    color: var(--muted);
    max-width: 500px;
    margin-top: 1.5rem;
    line-height: 1.8;
    opacity: 0;
    animation: fadeUp 0.6s 0.4s ease forwards;
}

/* ── SECTION ── */
.section {
    padding: 5rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-label {
    font-family: var(--font-head);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.8rem;
}

.section-title {
    font-family: var(--font-head);
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.1;
    margin-bottom: 0.75rem;
}

.section-sub {
    font-size: 0.92rem;
    color: var(--muted);
    max-width: 520px;
    margin-bottom: 3.5rem;
    line-height: 1.75;
}

/* ── HARDWARE GRID ── */
.hw-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5px;
    border: 1.5px solid var(--border);
    margin-bottom: 1.5px;
}

.hw-grid-bottom {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5px;
    border: 1.5px solid var(--border);
    border-top: none;
}

.hw-card {
    background: var(--card);
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    transition: background 0.3s;
    cursor: default;
}

.hw-card:hover { background: var(--card-hover); }

.hw-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: transparent;
    transition: background 0.3s;
}

.hw-card:nth-child(1)::before { background: var(--accent); }
.hw-card:nth-child(2)::before { background: var(--accent2); }
.hw-card:nth-child(3)::before { background: var(--accent3); }

.hw-card-bottom:nth-child(1)::before { background: var(--accent4); }
.hw-card-bottom:nth-child(2)::before { background: var(--accent); }

.component-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 1px;
    padding: 0.3rem 0.7rem;
    border-radius: 3px;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
}

.tag-green { background: rgba(58,255,192,0.1); color: var(--accent); border: 1px solid rgba(58,255,192,0.2); }
.tag-blue  { background: rgba(79,157,255,0.1); color: var(--accent2); border: 1px solid rgba(79,157,255,0.2); }
.tag-red   { background: rgba(255,107,107,0.1); color: var(--accent3); border: 1px solid rgba(255,107,107,0.2); }
.tag-orange{ background: rgba(255,179,71,0.1); color: var(--accent4); border: 1px solid rgba(255,179,71,0.2); }

.hw-card-title {
    font-family: var(--font-head);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    margin-bottom: 0.5rem;
}

.hw-card-subtitle {
    font-size: 0.78rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
}

.hw-card-desc {
    font-size: 0.9rem;
    color: var(--muted);
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.spec-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.spec-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.83rem;
    color: var(--muted);
}

.spec-list li::before {
    content: '—';
    color: var(--accent);
    flex-shrink: 0;
    font-size: 0.75rem;
    margin-top: 0.1rem;
}

/* ── SOFTWARE STACK ── */
.sw-stack {
    display: flex;
    flex-direction: column;
    gap: 1px;
    border: 1.5px solid var(--border);
}

.sw-row {
    display: grid;
    grid-template-columns: 240px 1fr auto;
    align-items: center;
    gap: 2rem;
    background: var(--card);
    padding: 1.8rem 2.5rem;
    transition: background 0.2s;
}

.sw-row:hover { background: var(--card-hover); }

.sw-name {
    font-family: var(--font-head);
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.sw-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.sw-desc {
    font-size: 0.88rem;
    color: var(--muted);
    line-height: 1.6;
}

.sw-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    white-space: nowrap;
}

/* ── WIRING TABLE ── */
.wiring-block {
    border: 1.5px solid var(--border);
    overflow: hidden;
}

.wiring-header {
    background: var(--surface);
    padding: 1.2rem 2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    border-bottom: 1px solid var(--border);
}

.wiring-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
}

.wiring-title {
    font-family: var(--font-head);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.wiring-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.83rem;
}

.wiring-table th {
    background: rgba(255,255,255,0.03);
    color: var(--muted);
    font-weight: 400;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    font-size: 0.68rem;
    padding: 0.8rem 2rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.wiring-table td {
    padding: 0.85rem 2rem;
    border-bottom: 1px solid rgba(30,40,64,0.6);
    color: var(--text);
}

.wiring-table tr:last-child td { border-bottom: none; }
.wiring-table tr:hover td { background: rgba(255,255,255,0.02); }

.pin-from {
    background: rgba(58,255,192,0.08);
    color: var(--accent);
    padding: 0.15rem 0.6rem;
    border-radius: 3px;
    border: 1px solid rgba(58,255,192,0.15);
}

.pin-to {
    background: rgba(79,157,255,0.08);
    color: var(--accent2);
    padding: 0.15rem 0.6rem;
    border-radius: 3px;
    border: 1px solid rgba(79,157,255,0.15);
}

.arrow {
    color: var(--border-light);
    font-size: 0.9rem;
}

.wiring-grids {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* ── DATA FLOW ── */
.flow-row {
    display: flex;
    align-items: center;
    gap: 0;
    margin-top: 3rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.flow-node {
    flex-shrink: 0;
    padding: 1.2rem 1.5rem;
    background: var(--card);
    border: 1px solid var(--border);
    text-align: center;
    min-width: 130px;
}

.flow-node-icon {
    font-size: 1.5rem;
    margin-bottom: 0.4rem;
}

.flow-node-name {
    font-family: var(--font-head);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: -0.2px;
}

.flow-node-sub {
    font-size: 0.68rem;
    color: var(--muted);
    font-family: var(--font-mono);
}

.flow-arrow {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 0.4rem;
}

.flow-arrow-line {
    width: 40px;
    height: 1.5px;
    background: linear-gradient(to right, var(--accent), var(--accent2));
}

.flow-arrow-label {
    font-size: 0.6rem;
    color: var(--muted);
    font-family: var(--font-mono);
    white-space: nowrap;
    margin-top: 0.3rem;
}

/* ── FOOTER ── */
footer {
    border-top: 1px solid var(--border);
    padding: 2rem 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

footer span { font-size: 0.82rem; color: var(--muted); }

.footer-links { display: flex; gap: 1.5rem; }

.footer-links a {
    font-size: 0.82rem;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* ── REVEAL ── */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    nav { padding: 1rem 1.5rem; }
    .nav-links { display: none; }
    .page-header { padding: 7rem 1.5rem 3rem; }
    .section { padding: 3.5rem 1.5rem; }
    .hw-grid { grid-template-columns: 1fr; }
    .hw-grid-bottom { grid-template-columns: 1fr; }
    .wiring-grids { grid-template-columns: 1fr; }
    .sw-row { grid-template-columns: 1fr; gap: 0.5rem; }
    footer { padding: 1.5rem; flex-direction: column; gap: 1rem; text-align: center; }
}