:root {
  --bg: #f3efe5;
  --paper: #fffdf8;
  --ink: #1e2a2f;
  --muted: #5d6a6f;
  --accent: #0f766e;
  --accent-dark: #0a4f4a;
  --accent-2: #c08457;
  --line: #d8d0c2;
  --soft: #e6f0eb;
  --code-bg: #182126;
  --code-ink: #eaf4f2;
  --nav-bg: rgba(255, 253, 248, 0.82);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(15, 118, 110, 0.12), transparent 26%),
    radial-gradient(circle at left 20%, rgba(192, 132, 87, 0.10), transparent 24%),
    var(--bg);
  line-height: 1.6;
}

a {
  color: var(--accent-dark);
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 20px 56px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  margin-bottom: 24px;
  backdrop-filter: blur(14px);
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--nav-bg);
  box-shadow: 0 10px 30px rgba(30, 42, 47, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 6px rgba(15, 118, 110, 0.10);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  padding: 8px 12px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  color: var(--muted);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav a:hover,
.nav a.active {
  background: var(--soft);
  color: var(--accent-dark);
}

.hero,
.card,
.feature {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(30, 42, 47, 0.06);
}

.hero {
  padding: 36px 32px;
  margin-bottom: 24px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0 0 12px;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.2rem, 4vw, 3.5rem);
}

h2 {
  font-size: 1.55rem;
}

h3 {
  font-size: 1.1rem;
}

p {
  margin: 0 0 14px;
  color: var(--muted);
}

.hero-copy {
  max-width: 720px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.stack {
  display: grid;
  gap: 18px;
}

.card,
.feature {
  padding: 24px;
}

.feature strong {
  color: var(--ink);
}

.kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.kpi {
  padding: 16px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(15, 118, 110, 0.07), rgba(15, 118, 110, 0.02));
  border: 1px solid rgba(15, 118, 110, 0.12);
}

.kpi-value {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
}

.kpi-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
}

.callout {
  padding: 14px 16px;
  border-left: 4px solid var(--accent-2);
  background: rgba(192, 132, 87, 0.07);
  border-radius: 12px;
  color: var(--ink);
}

pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  border-radius: 14px;
  background: var(--code-bg);
  color: var(--code-ink);
  font-size: 14px;
  line-height: 1.5;
}

code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
}

.inline-code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
}

.copy-wrap {
  position: relative;
}

.copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.08);
  color: var(--code-ink);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  cursor: pointer;
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.14);
}

ul,
ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.section-head {
  margin-bottom: 12px;
}

.footer-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--muted);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background: transparent;
  color: var(--accent-dark);
  border-color: var(--line);
}

.interactive-shell {
  display: grid;
  gap: 16px;
}

.step-buttons,
.tab-buttons,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.step-button,
.tab-button,
.chip {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  border-radius: 999px;
  padding: 10px 14px;
  font: inherit;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.step-button:hover,
.tab-button:hover,
.chip:hover,
.step-button.active,
.tab-button.active,
.chip.active {
  background: var(--soft);
  color: var(--accent-dark);
  border-color: rgba(15, 118, 110, 0.22);
  transform: translateY(-1px);
}

.interactive-panel {
  padding: 18px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(15, 118, 110, 0.04), rgba(255, 253, 248, 0.85));
}

.interactive-panel h3 {
  margin-bottom: 8px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.metric-card {
  padding: 14px;
  border-radius: 14px;
  background: rgba(15, 118, 110, 0.06);
  border: 1px solid rgba(15, 118, 110, 0.10);
}

.metric-card strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
}

.metric-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

[hidden] {
  display: none !important;
}

.mini-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.mini-table th,
.mini-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.mini-table th {
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.muted {
  color: var(--muted);
}

@media (max-width: 720px) {
  .page {
    padding: 16px 14px 42px;
  }

  .hero,
  .card,
  .feature {
    padding: 20px;
  }

  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}