:root {
    --bg: #07111f;
    --bg-soft: #0d1b2a;
    --panel: rgba(17, 24, 39, 0.88);
    --panel-alt: rgba(15, 23, 42, 0.9);
    --card: #111827;
    --card-alt: #0f172a;
    --muted: #93a4b8;
    --text: #e5eefc;
    --primary: #60a5fa;
    --primary-strong: #2563eb;
    --secondary: #a78bfa;
    --border: rgba(148, 163, 184, 0.2);
    --success: #34d399;
    --shadow: 0 22px 52px rgba(15, 23, 42, 0.48);
    --input-bg: rgba(15, 23, 42, 0.8);
    --input-text: #e2e8f0;
}

body[data-theme='light'] {
    --bg: #edf4ff;
    --bg-soft: #dfe9ff;
    --panel: rgba(255, 255, 255, 0.9);
    --panel-alt: rgba(248, 250, 252, 0.92);
    --card: #ffffff;
    --card-alt: #f8fafc;
    --muted: #52607a;
    --text: #0f172a;
    --primary: #2563eb;
    --primary-strong: #1d4ed8;
    --secondary: #7c3aed;
    --border: rgba(15, 23, 42, 0.12);
    --success: #15803d;
    --shadow: 0 18px 44px rgba(37, 99, 235, 0.14);
    --input-bg: #ffffff;
    --input-text: #0f172a;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background:
        radial-gradient(circle at top left, rgba(96, 165, 250, 0.2), transparent 30%),
        radial-gradient(circle at bottom right, rgba(167, 139, 250, 0.2), transparent 25%),
        var(--bg);
    color: var(--text);
}

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

.page-shell {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 18px 48px;
}

.theme-toggle {
    border: 1px solid var(--border);
    background: rgba(148, 163, 184, 0.08);
    color: var(--text);
    border-radius: 12px;
    padding: 9px 12px;
    cursor: pointer;
    font-weight: 600;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px 22px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
    position: sticky;
    top: 12px;
    z-index: 10;
}

.brand-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-weight: 800;
    font-size: 1.2rem;
    box-shadow: 0 10px 24px rgba(96, 165, 250, 0.4);
}

.eyebrow {
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.68rem;
    color: var(--muted);
}

.topbar h1 {
    margin: 2px 0 0;
    font-size: 1.1rem;
}

.topnav {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--muted);
    font-size: 0.95rem;
}

.topnav a {
    transition: color 0.2s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: 0;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
}

.hero {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 26px;
    padding: 56px 0 30px;
    align-items: center;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(96, 165, 250, 0.12);
    border: 1px solid rgba(96, 165, 250, 0.28);
    color: #dbeafe;
    font-size: 0.76rem;
    font-weight: 600;
    margin-bottom: 18px;
}

.badge.secondary {
    background: rgba(167, 139, 250, 0.12);
    border-color: rgba(167, 139, 250, 0.25);
    color: #e9d5ff;
}

.hero-copy h2 {
    margin: 0;
    font-size: clamp(2.2rem, 3vw, 4rem);
    line-height: 1.05;
    letter-spacing: -0.06em;
}

.hero-copy p {
    margin: 18px 0 0;
    max-width: 640px;
    color: var(--muted);
    line-height: 1.7;
    font-size: 1rem;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 24px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 18px;
    border-radius: 12px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    color: var(--text);
}

.button:hover {
    transform: translateY(-1px);
}

.button.small {
    min-height: 36px;
    padding: 0 12px;
    font-size: 0.82rem;
}

.button.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-strong));
    box-shadow: 0 12px 18px rgba(37, 99, 235, 0.35);
    color: white;
}

.button.secondary {
    background: rgba(148, 163, 184, 0.08);
    border: 1px solid var(--border);
}

.hero-panel {
    background: var(--panel-alt);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.window-bar {
    display: flex;
    gap: 8px;
    padding: 14px 18px;
    background: rgba(148, 163, 184, 0.08);
    border-bottom: 1px solid var(--border);
}

.window-bar span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    background: #f87171;
}

.window-bar span:nth-child(2) {
    background: #fbbf24;
}

.window-bar span:nth-child(3) {
    background: #34d399;
}

.code-preview {
    padding: 20px 18px 24px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.9rem;
    color: #dfeaf9;
    line-height: 1.8;
    background: rgba(2, 6, 23, 0.7);
}

.line {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.token.keyword { color: #c084fc; }
.token.var { color: #7dd3fc; }
.token.string { color: #86efac; }

.stats-grid,
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    margin-top: 20px;
}

.stat-card,
.feature-card,
.architecture-box {
    background: linear-gradient(180deg, var(--card), var(--card-alt));
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.stat-card {
    padding: 18px 18px 20px;
}

.label {
    display: block;
    color: var(--muted);
    margin-bottom: 12px;
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.stat-card strong {
    display: block;
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.stat-card small {
    color: var(--muted);
}

.feature-section,
.architecture {
    margin-top: 52px;
}

.section-heading {
    margin-bottom: 18px;
}

.section-heading h3 {
    margin: 0;
    font-size: clamp(1.6rem, 2vw, 2.4rem);
}

.feature-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card {
    padding: 22px 20px;
}

.feature-card h4 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.feature-card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}

.architecture-box {
    padding: 20px 24px;
}

.architecture-box ul {
    margin: 0;
    padding-left: 18px;
    color: var(--text);
    line-height: 2.1;
}

@media (max-width: 980px) {
    .hero,
    .feature-grid,
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 760px) {
    .topbar {
        flex-wrap: wrap;
        justify-content: space-between;
    }

    .nav-toggle {
        display: flex;
    }

    .topnav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding-top: 8px;
    }

    .topnav.is-open {
        display: flex;
    }

    .hero,
    .feature-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding-top: 30px;
    }
}