:root {
  --bg-primary: #0a0c10;
  --bg-surface: #12151c;
  --bg-subtle: #1a1e27;
  --border-subtle: #252b37;
  --border-focus: #3b82f6;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: rgba(37, 99, 235, 0.12);
  --success: #10b981;
  --warning: #f59e0b;
  --code-bg: #141820;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: #60a5fa;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
header.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background-color: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background-color: var(--accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #60a5fa;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
  color: #ffffff;
}

.hero-tagline {
  font-size: 1.35rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 32px;
  line-height: 1.45;
}

/* Primary Download Grid */
.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}

.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.download-card.featured {
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.card-header {
  margin-bottom: 20px;
}

.card-badge {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--accent-subtle);
  color: #60a5fa;
  margin-bottom: 8px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.specs-list {
  list-style: none;
  font-size: 0.85rem;
  margin: 16px 0 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.specs-list li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dotted var(--border-subtle);
  padding-bottom: 6px;
}

.specs-list .label {
  color: var(--text-muted);
}

.specs-list .val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-secondary);
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--accent);
  color: #ffffff;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background-color 0.15s ease;
  cursor: pointer;
  border: none;
}

.download-btn:hover {
  background: var(--accent-hover);
  text-decoration: none;
}

.download-btn.secondary {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.download-btn.secondary:hover {
  background: #252b37;
}

/* Checksum box */
.checksum-panel {
  background: var(--code-bg);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 16px 20px;
  margin-top: 32px;
  font-size: 0.82rem;
}

.checksum-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.checksum-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 10px;
}

.checksum-name {
  font-weight: 600;
  color: var(--text-secondary);
}

.checksum-value {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #38bdf8;
  word-break: break-all;
  background: rgba(0, 0, 0, 0.3);
  padding: 6px 10px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
}

/* Sections */
section.content-section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-head {
  margin-bottom: 40px;
}

.section-subtitle {
  font-size: 0.8rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #60a5fa;
  margin-bottom: 6px;
}

.section-head h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 24px;
}

.feature-icon {
  font-size: 1.4rem;
  margin-bottom: 14px;
}

.feature-box h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.feature-box p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Screenshots Showcase */
.screenshot-grid {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.screenshot-figure {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
}

.screenshot-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-bottom: 1px solid var(--border-subtle);
}

.screenshot-caption {
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.screenshot-caption strong {
  color: var(--text-primary);
}

/* Steps / Guides */
.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.guide-step {
  display: flex;
  gap: 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 20px;
}

.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-subtle);
  color: #60a5fa;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.step-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.code-snippet {
  font-family: var(--font-mono);
  background: var(--code-bg);
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: #e2e8f0;
  display: block;
  margin-top: 10px;
}

/* Callout Notice */
.callout {
  padding: 16px 20px;
  border-radius: 8px;
  margin: 20px 0;
  border-left: 4px solid;
  font-size: 0.9rem;
}

.callout.info {
  background: rgba(59, 130, 246, 0.08);
  border-color: #3b82f6;
  color: #93c5fd;
}

.callout.warning {
  background: rgba(245, 158, 11, 0.08);
  border-color: #f59e0b;
  color: #fcd34d;
}

/* Specs Table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 20px;
}

.spec-table th,
.spec-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}

.spec-table th {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.spec-table td {
  color: var(--text-secondary);
}

.spec-table td.strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Footer */
footer.site-footer {
  padding: 48px 0;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .download-grid,
  .features-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
}