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

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface-hover: #1a1a25;
  --border: #2a2a3a;
  --text: #e0e0e8;
  --text-dim: #8888a0;
  --accent: #7c6fff;
  --accent-hover: #9488ff;
  --accent-glow: rgba(124, 111, 255, 0.15);
  --green: #4ade80;
  --radius: 8px;
  --container: 960px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ── Header ─────────────────────────────────────────────────── */
header {
  padding: 80px 0 40px;
  text-align: center;
}

header h1 {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent) 0%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 1.25rem;
  color: var(--text-dim);
  margin-top: 8px;
}

/* ── Hero Download ──────────────────────────────────────────── */
.hero-download {
  text-align: center;
  padding: 40px 0;
}

.hero-download h2 {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-weight: 600;
  transition: all 0.15s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 30px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 0 40px var(--accent-glow);
}

.btn-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.btn span { text-align: left; }
.btn small {
  display: block;
  font-weight: 400;
  font-size: 0.8rem;
  opacity: 0.8;
}

.version-info {
  margin-top: 16px;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.loading-text {
  color: var(--text-dim);
  font-size: 1rem;
}

/* ── Download Grid ──────────────────────────────────────────── */
#all-downloads {
  padding: 48px 0;
}

#all-downloads h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.download-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s;
}

.download-card.current-platform {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 20px 12px;
}

.os-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.card-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.card-body {
  padding: 0 12px 12px;
}

.download-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 6px;
  color: var(--text);
  transition: background 0.1s;
}

.download-link:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.download-link.unavailable {
  opacity: 0.4;
  pointer-events: none;
}

.format {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(124, 111, 255, 0.1);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 4px;
  min-width: 64px;
  text-align: center;
}

.detail {
  flex: 1;
  font-size: 0.9rem;
}

.size {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* ── Checksums ──────────────────────────────────────────────── */
#checksums {
  padding: 32px 0;
}

#checksums h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
}

#checksum-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  font-size: 0.75rem;
  line-height: 1.8;
}

#checksum-list code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--text-dim);
}

/* ── Quick Start ────────────────────────────────────────────── */
#quickstart {
  padding: 48px 0;
}

#quickstart h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.quickstart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.qs-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.qs-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.qs-card p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.qs-card pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.7;
}

.qs-card code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--green);
}

/* ── Footer ─────────────────────────────────────────────────── */
footer {
  padding: 48px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}

footer p {
  font-size: 0.875rem;
  color: var(--text-dim);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  header { padding: 48px 0 24px; }
  header h1 { font-size: 2.5rem; }
  .tagline { font-size: 1rem; }
  .download-grid { grid-template-columns: 1fr; }
  .quickstart-grid { grid-template-columns: 1fr; }
}