:root {
  --bg: #0c1a1a;
  --bg-gradient: linear-gradient(160deg, #0c1a1a 0%, #122828 40%, #0e2420 100%);
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8e0d4;
  --muted: #a09888;
  --accent: #0e6d66;
  --accent-light: #14a89e;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;
  --max-width: 960px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}

a { color: var(--accent-light); }
a:hover { color: #1cc4b8; }

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

/* ---- Header / Nav ---- */
header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
}

.logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
  font-size: 0.88rem;
  color: var(--muted);
  transition: color 150ms;
}

nav a:hover, nav a.active { color: var(--text); }

/* ---- Hero ---- */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 600;
  line-height: 1.1;
  margin: 0 0 16px;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: transform 140ms, box-shadow 140ms;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-light);
  color: #fff;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  color: #fff;
}

/* ---- Screenshot Gallery ---- */
.gallery {
  padding: 40px 0;
}

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

.gallery-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.gallery-item img {
  width: 100%;
  display: block;
}

.gallery-item figcaption {
  padding: 10px 14px;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ---- Feature Cards ---- */
.features {
  padding: 60px 0;
}

.features h2 {
  font-family: var(--serif);
  font-size: 1.8rem;
  text-align: center;
  margin: 0 0 40px;
}

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

.feature-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- Content Pages ---- */
.page-content {
  padding: 48px 0 80px;
}

.page-content h1 {
  font-family: var(--serif);
  font-size: 2rem;
  margin: 0 0 8px;
}

.page-content h2 {
  font-family: var(--serif);
  font-size: 1.4rem;
  margin: 40px 0 12px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.page-content h3 {
  font-size: 1.1rem;
  margin: 28px 0 8px;
}

.page-content p, .page-content li {
  color: var(--muted);
  font-size: 0.95rem;
}

.page-content ul, .page-content ol {
  padding-left: 24px;
}

.page-content code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
}

.page-content pre {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

.page-content pre code {
  background: none;
  padding: 0;
}

/* ---- Tool Table ---- */
.tool-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 16px 0;
}

.tool-table th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 2px solid var(--border);
  color: var(--text);
  font-weight: 600;
}

.tool-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  vertical-align: top;
}

.tool-table tr:hover td {
  background: var(--surface-hover);
}

/* ---- Footer ---- */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ---- Architecture Diagram (ASCII art) ---- */
.diagram {
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.4;
  overflow-x: auto;
  white-space: pre;
  color: var(--accent-light);
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .hero { padding: 48px 0 36px; }
  .hero h1 { font-size: 1.8rem; }
  .features { padding: 36px 0; }
  header .container { justify-content: center; }
}