:root {
    --bg: #0c0f14;
    --bg-elevated: #121820;
    --bg-card: #161d28;
    --border: #2a3544;
    --text: #e8edf5;
    --text-muted: #9aa8bc;
    --accent: #5b9cff;
    --accent-soft: rgba(91, 156, 255, 0.12);
    --accent-2: #7ee0c2;
    --unity: #ffffff;
    --code-bg: #0a0e13;
    --radius: 12px;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
    --font-sans: "IBM Plex Sans", system-ui, sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, monospace;
    --container: min(1120px, calc(100% - 2.5rem));
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

[id] {
    scroll-margin-top: 5rem;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 156, 255, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 100% 0%, rgba(126, 224, 194, 0.06), transparent);
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: var(--container);
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 1000;
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: #000;
}

.skip-link:focus {
    left: 1rem;
    top: 1rem;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid transparent;
    background: rgba(12, 15, 20, 0.72);
    backdrop-filter: blur(12px);
    transition: border-color 0.2s, background 0.2s;
}

.site-header.is-scrolled {
    border-color: var(--border);
    background: rgba(12, 15, 20, 0.92);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text);
    text-decoration: none;
}

.brand:hover {
    text-decoration: none;
}

.brand-mark {
    width: 2rem;
    height: 2rem;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 0 24px rgba(91, 156, 255, 0.35);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.brand-text strong {
    color: var(--text);
    font-size: 0.95rem;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem 1.1rem;
    font-size: 0.9rem;
}

.site-nav a:not(.btn) {
    color: var(--text-muted);
    text-decoration: none;
}

.site-nav a:not(.btn):hover {
    color: var(--text);
    text-decoration: none;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1.25rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform 0.15s, background 0.15s, border-color 0.15s;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-primary {
    background: linear-gradient(135deg, #4a8ef5, #3d7ae8);
    color: #fff;
    box-shadow: 0 8px 24px rgba(74, 142, 245, 0.35);
}

.btn-secondary {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-sm {
    padding: 0.45rem 0.9rem;
    font-size: 0.85rem;
}

/* Hero */
.hero {
    padding: 4.5rem 0 3.5rem;
}

.hero-grid {
    display: grid;
    gap: 2.5rem;
    align-items: start;
}

@media (min-width: 900px) {
    .hero-grid {
        grid-template-columns: 1.15fr 0.85fr;
    }
}

.eyebrow {
    display: inline-block;
    margin-bottom: 1rem;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent-2);
    background: rgba(126, 224, 194, 0.1);
    border: 1px solid rgba(126, 224, 194, 0.25);
}

.hero h1 {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 4.5vw, 2.85rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.hero-lead {
    margin: 0 0 1.5rem;
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 42rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.75rem;
}

.hero-bullets {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.45rem;
}

.hero-bullets li {
    position: relative;
    padding-left: 1.35rem;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.hero-bullets li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

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

.hero-panel h2 {
    margin: 0 0 0.75rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.code-block {
    margin: 0;
    padding: 1rem 1.1rem;
    border-radius: 8px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.55;
    color: #c5d4e8;
}

.code-block .kw { color: #c792ea; }
.code-block .type { color: #82aaff; }
.code-block .fn { color: #ffcb6b; }
.code-block .num { color: #f78c6c; }
.code-block .cm { color: #637792; }

/* Stats */
.stats {
    padding: 2rem 0 3rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.stat-value {
    display: block;
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    color: var(--accent);
    line-height: 1.1;
}

.stat-label {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* Sections */
.section {
    padding: 3.5rem 0;
    border-top: 1px solid var(--border);
}

.section-header {
    max-width: 44rem;
    margin-bottom: 2rem;
}

.section-header h2 {
    margin: 0 0 0.65rem;
    font-size: clamp(1.5rem, 3vw, 1.9rem);
    letter-spacing: -0.02em;
}

.section-header p {
    margin: 0;
    color: var(--text-muted);
}

/* Cards */
.card-grid {
    display: grid;
    gap: 1rem;
}

@media (min-width: 700px) {
    .card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
    .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
    padding: 1.35rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.card h3 {
    margin: 0 0 0.5rem;
    font-size: 1.05rem;
}

.card p,
.card ul {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.card ul {
    padding-left: 1.1rem;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
    padding: 0;
    list-style: none;
}

.tag-list li {
    padding: 0.25rem 0.55rem;
    border-radius: 6px;
    font-size: 0.75rem;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid rgba(91, 156, 255, 0.2);
}

/* API tabs */
.api-cards {
    display: grid;
    gap: 1.25rem;
}

@media (min-width: 960px) {
    .api-cards {
        grid-template-columns: repeat(3, 1fr);
    }
}

.api-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.api-card .code-block {
    flex: 1;
    font-size: 0.72rem;
}

/* Architecture flow */
.flow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.flow span.arrow {
    color: var(--accent);
}

/* Inspector tabs */
.inspector-tabs {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.inspector-tab-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    padding: 0.5rem 0.5rem 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.inspector-tab {
    appearance: none;
    border: 1px solid transparent;
    border-bottom: none;
    margin: 0 0.15rem;
    padding: 0.55rem 0.85rem;
    border-radius: 8px 8px 0 0;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s, background 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.inspector-tab:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.04);
}

.inspector-tab.is-active {
    color: var(--text);
    background: var(--bg-card);
    border-color: var(--border);
    border-bottom: 1px solid var(--bg-card);
    margin-bottom: -1px;
    position: relative;
    z-index: 1;
}

.inspector-tab:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.tab-badge {
    display: inline-block;
    margin-left: 0.35rem;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--accent-2);
    background: rgba(126, 224, 194, 0.12);
    vertical-align: middle;
}

.inspector-panels {
    padding: 1.25rem;
}

.inspector-panel {
    animation: inspector-fade 0.2s ease;
}

@keyframes inspector-fade {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.unity-inspector-title {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    font-weight: 600;
}

.unity-tag {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--accent-2);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    background: rgba(126, 224, 194, 0.1);
    border: 1px solid rgba(126, 224, 194, 0.25);
}

.inspector-compare {
    display: grid;
    gap: 1rem;
}

@media (min-width: 800px) {
    .inspector-compare {
        grid-template-columns: 1fr 1fr;
    }
}

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

.inspector-card-display {
    border-color: rgba(126, 224, 194, 0.25);
    box-shadow: inset 0 0 0 1px rgba(126, 224, 194, 0.08);
}

.inspector-card h4 {
    margin: 0 0 0.75rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.inspector-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

.inspector-row:last-child {
    border-bottom: none;
}

.inspector-row .label {
    color: var(--text-muted);
}

.inspector-row .value {
    font-family: var(--font-mono);
    color: var(--accent-2);
}

.inspector-row .value.native {
    color: var(--text);
}

.inspector-panel-note {
    margin: 1rem 0 0;
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.inspector-footer-note {
    margin: 1.25rem 0 0;
    font-size: 0.92rem;
    color: var(--text-muted);
}

/* Feature list */
.feature-columns {
    columns: 1;
    gap: 2rem;
}

@media (min-width: 700px) {
    .feature-columns {
        columns: 2;
    }
}

.feature-columns ul {
    margin: 0;
    padding-left: 1.1rem;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.feature-columns li {
    margin-bottom: 0.35rem;
    break-inside: avoid;
}

/* Docs topics */
.docs-grid {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

.docs-grid span {
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-size: 0.88rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

/* CTA */
.cta {
    text-align: center;
    padding: 4rem 0 5rem;
    background: linear-gradient(180deg, transparent, rgba(91, 156, 255, 0.06));
}

.cta h2 {
    margin: 0 0 0.75rem;
    font-size: clamp(1.5rem, 3vw, 2rem);
}

.cta p {
    margin: 0 auto 1.5rem;
    max-width: 36rem;
    color: var(--text-muted);
}

.cta-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    background: var(--bg-elevated);
}

.footer-inner {
    text-align: center;
}

.footer-inner p {
    margin: 0 0 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-tagline {
    font-style: italic;
    max-width: 40rem;
    margin-inline: auto !important;
}

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

/* Privacy */
.legal-page {
    padding: 3rem 0 4rem;
    max-width: 42rem;
}

.legal-page h1 {
    margin-top: 0;
}

.legal-page p {
    color: var(--text-muted);
}

@media (max-width: 720px) {
    .site-nav a:not(.btn-primary) {
        display: none;
    }
}