:root {
  --bg: #f8f9fa;
  --bg-card: #ffffff;
  --bg-alt: #f0f2f5;
  --text: #1d2430;
  --text-dim: #556070;
  --border: #dfe4ea;
  --accent: #1e3c72;
  --accent-light: #2a5298;
  --accent-text: #ffffff;
  --info-bg: #eef3fa;
  --term-bg: #151922;
  --term-text: #e6edf3;
  --term-dim: #8b949e;
  --term-accent: #7ee787;
  --term-blue: #79c0ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

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

/* Top navigation */
nav.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  gap: 16px;
  flex-wrap: wrap;
}
nav.topnav .brand {
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  letter-spacing: -0.01em;
}
nav.topnav .brand:hover {
  text-decoration: none;
}
nav.topnav .links {
  display: flex;
  gap: 20px;
  font-size: 14px;
  font-weight: 500;
  flex-wrap: wrap;
}
nav.topnav .links a {
  color: var(--text-dim);
}
nav.topnav .links a:hover,
nav.topnav .links a.active {
  color: var(--accent);
}
nav.topnav .links a.active {
  font-weight: 600;
}

/* Hero */
header.hero {
  text-align: center;
  padding: 52px 0 32px;
}
header.hero h1 {
  font-size: clamp(32px, 6vw, 48px);
  margin: 0 0 10px;
  letter-spacing: -0.025em;
}
header.hero .subtitle {
  font-size: 16px;
  color: var(--text-dim);
  margin: 6px 0 20px;
  font-weight: 500;
}
header.hero p.tagline {
  font-size: clamp(16px, 3vw, 19px);
  color: var(--text);
  max-width: 680px;
  margin: 0 auto 24px;
  line-height: 1.55;
}
.hero-meta {
  font-size: 14px;
  color: var(--text-dim);
  margin: 14px 0 0;
}

/* Page header (subpages) */
header.page-header {
  padding: 40px 0 20px;
  border-bottom: 1px solid var(--border);
}
header.page-header h1 {
  font-size: clamp(28px, 5vw, 38px);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}
header.page-header p {
  margin: 0;
  color: var(--text-dim);
  font-size: 16px;
}

/* Install box */
.install-box {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--term-bg);
  color: var(--term-text);
  border-radius: 10px;
  padding: 10px 14px 10px 18px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  max-width: 100%;
  overflow-x: auto;
  margin: 8px auto 0;
}
.install-box .prompt {
  color: var(--term-dim);
  user-select: none;
}
.copy-btn {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
}
.copy-btn:hover {
  background: rgba(255, 255, 255, 0.22);
}

/* Buttons */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 22px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid var(--border);
  transition: all 0.15s;
}
.btn.primary {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  color: var(--accent-text);
  border-color: transparent;
}
.btn.primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  text-decoration: none;
}
.btn.secondary {
  background: var(--bg-card);
  color: var(--text);
}
.btn.secondary:hover {
  background: var(--bg-alt);
  text-decoration: none;
}

/* Terminal preview */
.terminal-mock {
  background: var(--term-bg);
  color: var(--term-text);
  border-radius: 12px;
  border: 1px solid #2b3240;
  overflow: hidden;
  margin: 28px 0 40px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
}
.terminal-mock .titlebar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  background: #1d222e;
  border-bottom: 1px solid #2b3240;
  font-size: 12px;
  color: var(--term-dim);
}
.terminal-mock .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.terminal-mock .dot.r { background: #ff5f56; }
.terminal-mock .dot.y { background: #ffbd2e; }
.terminal-mock .dot.g { background: #27c93f; }
.terminal-mock .titlebar span.title {
  margin-left: 6px;
}
.terminal-mock pre {
  margin: 0;
  border: none;
  background: transparent;
  color: var(--term-text);
  padding: 16px 18px;
  font-size: 13px;
  line-height: 1.5;
  overflow-x: auto;
}
.t-dim { color: var(--term-dim); }
.t-green { color: var(--term-accent); }
.t-blue { color: var(--term-blue); }

/* TOC */
.toc {
  background: var(--info-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 32px 0;
}
.toc h2 {
  font-size: 15px;
  margin: 0 0 12px;
  color: var(--text);
}
.toc ol {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 4px 20px;
  margin: 0;
}
.toc li {
  padding: 4px 0;
  font-size: 14px;
}

/* Sections */
section {
  margin: 44px 0;
}
section h2 {
  font-size: 25px;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
section h3 {
  font-size: 18px;
  margin: 28px 0 12px;
  letter-spacing: -0.01em;
}
section h4 {
  font-size: 15px;
  margin: 18px 0 10px;
  font-weight: 600;
}

/* Info box */
.info-box {
  background: var(--info-bg);
  border-left: 4px solid var(--accent-light);
  border-radius: 6px;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: 14px;
}
.info-box strong {
  color: var(--accent);
}

/* Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
}
.feature-card h3,
.feature-card h4 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--accent);
}
.feature-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
  background: var(--bg-card);
}
table th {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 11px 14px;
  text-align: left;
  font-weight: 600;
}
table td {
  border: 1px solid var(--border);
  padding: 11px 14px;
  vertical-align: top;
}

/* Code blocks */
code, pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
}
code.inline {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 6px;
}
pre {
  background: #ebeff5;
  color: #1d2430;
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 14px 0;
  line-height: 1.45;
  border: 1px solid var(--border);
}
.terminal-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 16px 0 6px;
  font-weight: 600;
}

/* Steps */
ol.steps {
  margin: 0;
  padding-left: 0;
  list-style: none;
  counter-reset: list-number;
}
ol.steps > li {
  margin: 18px 0;
  padding-left: 34px;
  position: relative;
}
ol.steps > li::before {
  content: counter(list-number);
  counter-increment: list-number;
  position: absolute;
  left: 0;
  top: 1px;
  background: var(--accent);
  color: #ffffff;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

/* How it works */
.how-it-works {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.phase {
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent-light);
  border-radius: 10px;
  padding: 20px 16px;
  background: var(--bg-card);
  text-align: center;
}
.phase-number {
  background: var(--accent);
  color: #ffffff;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  margin: 0 auto 12px;
}
.phase h3 {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 16px;
}
.phase p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
}

/* Footer */
footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 56px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
}
footer a {
  color: var(--accent);
}

ul, ol {
  margin: 10px 0;
  padding-left: 1.4em;
}
ul li, ol li {
  margin: 6px 0;
}

@media (max-width: 768px) {
  .toc ol { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .how-it-works { grid-template-columns: 1fr; }
}