/* ─── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --c-bg:         #0a0e1a;
    --c-surface:    #111827;
    --c-surface2:   #1a2235;
    --c-border:     #1e2d45;
    --c-primary:    #3b82f6;
    --c-primary-h:  #2563eb;
    --c-accent:     #06b6d4;
    --c-text:       #e2e8f0;
    --c-muted:      #64748b;
    --c-success:    #10b981;
    --c-warning:    #f59e0b;
    --c-danger:     #ef4444;
    --c-code-bg:    #0d1117;

    --radius:       8px;
    --radius-lg:    12px;
    --shadow:       0 4px 24px rgba(0,0,0,.4);
    --transition:   .2s ease;
    --font:         'Inter', system-ui, -apple-system, sans-serif;
    --font-mono:    'JetBrains Mono', 'Fira Code', monospace;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    font-size: 16px;
}

a { color: var(--c-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-accent); }
img { max-width: 100%; display: block; }

/* ─── Container ─────────────────────────────────────────────────────────────── */
.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ─── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; border-radius: var(--radius);
    font-size: 14px; font-weight: 600; cursor: pointer;
    border: none; transition: all var(--transition); white-space: nowrap;
    font-family: var(--font);
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-h); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(59,130,246,.4); }
.btn-outline { background: transparent; color: var(--c-text); border: 1px solid var(--c-border); }
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* ─── Navbar ────────────────────────────────────────────────────────────────── */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(10,14,26,.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--c-border);
}
.navbar .container { display: flex; align-items: center; gap: 32px; height: 64px; }

.brand { font-size: 20px; font-weight: 700; color: var(--c-text); letter-spacing: -.5px; }
.brand strong { color: var(--c-primary); }

.nav-links { display: flex; align-items: center; gap: 8px; list-style: none; margin-left: auto; }
.nav-links a {
    color: var(--c-muted); font-size: 14px; font-weight: 500;
    padding: 6px 12px; border-radius: var(--radius); transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--c-text); background: var(--c-surface2); }
.nav-links .btn { color: #fff; }
.nav-links .btn-outline { color: var(--c-text); }

.lang-switch { display: flex; gap: 4px; margin-left: 16px; }
.lang-switch a {
    font-size: 12px; font-weight: 600; color: var(--c-muted);
    padding: 4px 8px; border-radius: 4px; transition: all var(--transition);
}
.lang-switch a:hover, .lang-switch a.active { color: var(--c-primary); background: rgba(59,130,246,.1); }

/* ─── Hero ──────────────────────────────────────────────────────────────────── */
.hero {
    padding: 96px 0 80px; text-align: center;
    position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -200px; left: 50%;
    transform: translateX(-50%); width: 800px; height: 600px;
    background: radial-gradient(ellipse, rgba(59,130,246,.15) 0%, transparent 70%);
    pointer-events: none;
}
.hero h1 {
    font-size: clamp(32px,5vw,56px); font-weight: 800; letter-spacing: -1.5px;
    line-height: 1.1; margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, var(--c-accent) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero .lead { font-size: 18px; color: var(--c-muted); max-width: 560px; margin: 0 auto 36px; line-height: 1.7; }
.hero-cta { display: flex; justify-content: center; gap: 12px; margin-bottom: 48px; flex-wrap: wrap; }

/* ─── Code preview ──────────────────────────────────────────────────────────── */
.code-preview {
    background: var(--c-code-bg); border: 1px solid var(--c-border);
    border-radius: var(--radius-lg); padding: 24px;
    max-width: 640px; margin: 0 auto; text-align: left; box-shadow: var(--shadow);
}
.code-preview pre { overflow-x: auto; }
.code-preview code { font-family: var(--font-mono); font-size: 13px; color: #a5f3fc; line-height: 1.7; white-space: pre; }

/* ─── Categories section ────────────────────────────────────────────────────── */
.categories {
    padding: 80px 0;
    background: var(--c-surface);
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
}
.categories h2 { text-align: center; font-size: 28px; font-weight: 700; margin-bottom: 40px; letter-spacing: -.5px; }
.categories-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 16px; }
.cat-card {
    background: var(--c-surface2); border: 1px solid var(--c-border);
    border-radius: var(--radius-lg); padding: 24px 20px; text-align: center;
    transition: all var(--transition);
}
.cat-card:hover { border-color: var(--c-primary); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(59,130,246,.15); }
.cat-icon { font-size: 32px; margin-bottom: 12px; }
.cat-label { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.cat-price { font-size: 13px; color: var(--c-muted); font-family: var(--font-mono); }
.cat-kb-badge {
    display: inline-block; margin-top: 8px; font-size: 11px; font-weight: 600;
    color: var(--c-accent); background: rgba(6,182,212,.1);
    border: 1px solid rgba(6,182,212,.3); border-radius: 20px; padding: 2px 10px;
}

/* ─── Footer ────────────────────────────────────────────────────────────────── */
.footer { padding: 40px 0; text-align: center; color: var(--c-muted); font-size: 14px; border-top: 1px solid var(--c-border); }
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 16px; flex-wrap: wrap; }
.footer-links a, .footer a { color: var(--c-muted); }
.footer-links a:hover, .footer a:hover { color: var(--c-text); }

/* ─── Alert ─────────────────────────────────────────────────────────────────── */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 20px; font-size: 14px; }
.alert-danger { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); color: var(--c-danger); }

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero { padding: 60px 0 48px; }
    .categories-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 480px) {
    .categories-grid { grid-template-columns: 1fr; }
    .hero-cta { flex-direction: column; align-items: center; }
}