:root {
    --bg-primary: #070b14;
    --bg-secondary: #0f1729;
    --bg-card: #162033;
    --bg-card-hover: #1c2a42;
    --border: #233049;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #00e5a0;
    --accent-blue: #3b82f6;
    --accent-amber: #f59e0b;
    --accent-purple: #a855f7;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 8px;
    --max-w: 1140px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ── Nav ─────────────────────────────────────── */

.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(7, 11, 20, .85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav__inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: .75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__brand {
    display: flex; align-items: center; gap: .5rem;
    text-decoration: none; color: var(--text-primary);
}

.nav__icon { font-size: 1.5rem; color: var(--accent); }
.nav__name { font-weight: 700; font-size: 1.1rem; letter-spacing: -.02em; }

.nav__links {
    display: flex; align-items: center; gap: 1.5rem;
}

.nav__links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: .875rem;
    font-weight: 500;
    transition: color .2s;
}

.nav__links a:hover { color: var(--text-primary); }

.nav__btn {
    background: var(--accent) !important;
    color: var(--bg-primary) !important;
    padding: .45rem 1.1rem;
    border-radius: var(--radius);
    font-weight: 600 !important;
    transition: opacity .2s !important;
}

.nav__btn:hover { opacity: .85; }

/* ── Buttons ─────────────────────────────────── */

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: .75rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: .95rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all .2s;
    font-family: var(--font-sans);
}

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

.btn--primary:hover { opacity: .85; }

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

.btn--outline:hover {
    background: rgba(0, 229, 160, .1);
}

.btn--outline:disabled {
    opacity: .5;
    cursor: not-allowed;
}

.btn--sm { padding: .5rem 1rem; font-size: .85rem; }

/* ── Section common ──────────────────────────── */

.section__inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 5rem 1.5rem;
}

.section__tag {
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .15em;
    margin-bottom: .5rem;
}

.section__title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -.03em;
    margin-bottom: .75rem;
}

.section__sub {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 540px;
    margin-bottom: 3rem;
}

/* ── Hero ────────────────────────────────────── */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 1.5rem 4rem;
    overflow: hidden;
}

.hero__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 229, 160, .04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 160, .04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 30%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 30%, transparent 100%);
    animation: gridPulse 8s ease-in-out infinite;
}

@keyframes gridPulse {
    0%, 100% { opacity: .6; }
    50% { opacity: 1; }
}

.hero__content {
    position: relative;
    text-align: center;
    max-width: 720px;
}

.hero__tag {
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .2em;
    margin-bottom: 1.25rem;
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -.04em;
    margin-bottom: 1.25rem;
}

.hero__accent { color: var(--accent); }

.hero__sub {
    color: var(--text-secondary);
    font-size: 1.15rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.hero__cta {
    display: flex; gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3.5rem;
}

.hero__stats {
    display: flex; gap: 3rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero__stat { text-align: center; }

.hero__stat-val {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    font-family: var(--font-mono);
}

.hero__stat-label {
    font-size: .75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .1em;
}

/* ── Feature Cards ───────────────────────────── */

.features { background: var(--bg-secondary); }

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: border-color .25s, transform .25s;
}

.card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.card__icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: .75rem;
}

.card__title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: .5rem;
}

.card__text {
    color: var(--text-secondary);
    font-size: .92rem;
    line-height: 1.65;
}

.card--wide { grid-column: span 1; }

.card--highlight {
    border-color: var(--accent);
    position: relative;
}

.card__badge {
    position: absolute;
    top: -10px; right: 1.25rem;
    background: var(--accent);
    color: var(--bg-primary);
    font-size: .7rem;
    font-weight: 700;
    padding: .25rem .7rem;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.card__price {
    font-size: 2.5rem;
    font-weight: 800;
    margin: .75rem 0;
    color: var(--accent);
}

.card__price-period {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-muted);
}

.card__list {
    list-style: none;
    margin: 1rem 0 1.5rem;
}

.card__list li {
    padding: .4rem 0;
    font-size: .9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(35, 48, 73, .5);
}

.card__list li::before {
    content: '→ ';
    color: var(--accent);
    font-family: var(--font-mono);
}

/* ── Diagram ─────────────────────────────────── */

.how-it-works { background: var(--bg-primary); }

.diagram {
    overflow-x: auto;
    margin-bottom: 2.5rem;
}

.diagram__pre {
    font-family: var(--font-mono);
    font-size: .78rem;
    line-height: 1.5;
    color: var(--text-primary);
    white-space: pre;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}

.d-muted { color: var(--text-muted); }
.d-green { color: var(--accent); font-weight: 600; }
.d-blue { color: var(--accent-blue); font-weight: 600; }
.d-secondary { color: var(--text-secondary); }
.d-arrow { color: var(--accent); }

.callouts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.callout {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.callout__code {
    font-family: var(--font-mono);
    font-size: .82rem;
    color: var(--accent);
    display: block;
    margin-bottom: .4rem;
}

.callout__text {
    color: var(--text-secondary);
    font-size: .85rem;
    line-height: 1.55;
}

/* ── Hardware ────────────────────────────────── */

.hardware { background: var(--bg-secondary); }

.hardware__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.bom {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.bom td {
    padding: .55rem 0;
    font-size: .9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(35, 48, 73, .5);
}

.bom__price {
    text-align: right;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.bom__total td {
    font-weight: 700;
    color: var(--accent);
    border-bottom: none;
    padding-top: .75rem;
}

/* ── Notify form ─────────────────────────────── */

.card__notify { margin-top: 1.5rem; }

.card__notify-text {
    font-size: .85rem;
    color: var(--text-muted);
    margin-bottom: .5rem;
}

.card__notify-form {
    display: flex;
    gap: .5rem;
}

.input {
    flex: 1;
    padding: .5rem .75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: .85rem;
    outline: none;
    transition: border-color .2s;
}

.input:focus { border-color: var(--accent); }

/* ── Pricing ─────────────────────────────────── */

.pricing { background: var(--bg-primary); }

.pricing__cta {
    text-align: center;
}

/* ── Footer ──────────────────────────────────── */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.footer__inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 3rem 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer__tagline {
    color: var(--text-muted);
    font-size: .85rem;
    margin-top: .5rem;
}

.footer__links {
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
}

.footer__col {
    display: flex;
    flex-direction: column;
    gap: .5rem;
}

.footer__heading {
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: var(--text-muted);
    margin-bottom: .25rem;
}

.footer__col a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: .875rem;
    transition: color .2s;
}

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

.footer__bottom {
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: .8rem;
}

/* ── Mobile ──────────────────────────────────── */

@media (max-width: 768px) {
    .nav__links { display: none; }

    .hero__title { font-size: 2.2rem; }
    .hero__stats { gap: 1.5rem; }

    .section__inner { padding: 3.5rem 1.25rem; }
    .section__title { font-size: 1.75rem; }

    .hardware__grid,
    .pricing__grid { grid-template-columns: 1fr; }

    .diagram__pre { font-size: .65rem; padding: 1rem; }

    .footer__inner { flex-direction: column; }
}