@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+Condensed:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --canvas: #f3eee6;
  --paper: #fffdf9;
  --paper-2: #f8f3ec;
  --line: rgba(83, 87, 90, 0.18);
  --line-strong: rgba(67, 71, 75, 0.34);
  --ink: #1f2226;
  --ink-soft: #313741;
  --ink-muted: #5b636f;
  --blue: #258acb;
  --green: #7dba44;
  --yellow: #f3c333;
  --orange: #f28f28;
  --red: #ec4736;
  --focus: rgba(37, 138, 203, 0.28);
  --shadow: 0 4px 12px rgba(39, 45, 53, 0.08);
  --radius-lg: 10px;
  --radius-md: 8px;
  --max-width: 1280px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'IBM Plex Sans Condensed', sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 12%, rgba(37, 138, 203, 0.1), transparent 22%),
    radial-gradient(circle at 84% 16%, rgba(125, 186, 68, 0.12), transparent 18%),
    radial-gradient(circle at 84% 82%, rgba(242, 143, 40, 0.1), transparent 18%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(243, 238, 230, 0.98)),
    repeating-linear-gradient(180deg, transparent 0 47px, rgba(70, 75, 80, 0.04) 47px 48px);
  background-color: var(--canvas);
}

body::before {
  content: '';
  position: fixed;
  inset: 0 0 auto;
  height: 108px;
  pointer-events: none;
  background:
    linear-gradient(
      180deg,
      transparent 0 22px,
      var(--blue) 22px 31px,
      var(--green) 31px 40px,
      var(--yellow) 40px 49px,
      var(--orange) 49px 58px,
      var(--red) 58px 67px,
      transparent 67px 100%
    );
  opacity: 0.96;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.site-shell {
  position: relative;
  z-index: 1;
  width: min(100% - 36px, var(--max-width));
  margin: 0 auto;
  padding: 78px 0 42px;
}

.site-header,
.panel {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand img {
  width: 56px;
  height: 56px;
  display: block;
}

.brand-copy span {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.brand-copy strong {
  display: block;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.05em;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.top-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  font-size: 1rem;
  font-weight: 600;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.top-nav a.active,
.top-nav a:hover {
  border-color: rgba(37, 138, 203, 0.26);
  background: rgba(243, 238, 230, 0.72);
  color: var(--ink);
}

.layout {
  display: grid;
  gap: 18px;
  margin-top: 20px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.85fr);
  gap: 18px;
}

.panel {
  padding: 24px;
}

.page-marker,
.caption-title,
.step-no {
  font-family: 'IBM Plex Mono', monospace;
}

.page-marker {
  margin: 0 0 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.page-title,
h1,
h2,
h3 {
  margin: 0 0 12px;
  letter-spacing: -0.05em;
}

.page-title,
.hero h1 {
  font-size: clamp(2.9rem, 7vw, 5.4rem);
  line-height: 0.92;
}

.page-intro,
.lead,
.panel p,
.panel li {
  color: var(--ink-muted);
  font-size: 1.03rem;
  line-height: 1.65;
}

.hero-copy .lead {
  max-width: 40rem;
}

.hero-aside {
  background: var(--paper-2);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 600;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.button:hover {
  background: var(--paper);
  border-color: rgba(37, 138, 203, 0.32);
}

.button.primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.button.primary:hover {
  background: #2b3138;
  border-color: #2b3138;
}

.card-grid,
.step-grid {
  display: grid;
  gap: 14px;
}

.card-grid {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.step-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card,
.step-card,
.note-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.92);
  padding: 16px;
}

.card h3,
.step-card h3 {
  font-size: 1.28rem;
}

.note-card {
  border-left: 6px solid var(--orange);
  background:
    linear-gradient(135deg, rgba(242, 143, 40, 0.08), rgba(246, 241, 233, 0.96)),
    var(--paper);
}

.caption-title {
  display: block;
  margin-bottom: 8px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.step-no {
  display: block;
  margin-bottom: 8px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

pre,
code {
  font-family: 'IBM Plex Mono', monospace;
}

pre {
  margin: 0;
  padding: 18px;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: #222932;
  color: var(--paper);
}

code {
  background: rgba(246, 241, 233, 0.92);
  border: 1px solid rgba(31, 34, 38, 0.08);
  border-radius: 4px;
  padding: 0.12rem 0.3rem;
  font-size: 0.92em;
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}

.footer {
  margin-top: 20px;
  padding: 14px 0 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  body::before {
    height: 92px;
  }

  .site-shell {
    width: min(100% - 20px, var(--max-width));
    padding-top: 58px;
  }

  .site-header {
    flex-direction: column;
    align-items: stretch;
    padding: 14px 16px;
  }

  .top-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .top-nav a,
  .button {
    width: 100%;
  }

  .panel {
    padding: 18px;
  }

  .page-title,
  .hero h1 {
    font-size: clamp(2.2rem, 12vw, 3.8rem);
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .card-grid,
  .step-grid {
    grid-template-columns: 1fr;
  }
}