:root {
  --bg: #f6f4ee;
  --paper: #fffdf8;
  --paper-strong: #ffffff;
  --ink: #172033;
  --muted: #546178;
  --line: rgba(23, 32, 51, 0.12);
  --green: #16a34a;
  --green-deep: #166534;
  --blue: #2563eb;
  --purple: #5b21b6;
  --gold: #ca8a04;
  --shadow: 0 18px 50px rgba(20, 27, 45, 0.12);
  --code-bg: #0f172a;
  --code-text: #dbeafe;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.09), transparent 24%),
    radial-gradient(circle at top left, rgba(22, 163, 74, 0.08), transparent 20%),
    linear-gradient(180deg, #fbfaf5 0%, var(--bg) 100%);
}

a {
  color: inherit;
}

.sheet-page {
  max-width: 1460px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.sheet-hero {
  border-radius: 28px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 55%, #1d4ed8 100%);
  color: #ffffff;
  padding: 28px;
  box-shadow: var(--shadow);
}

.sheet-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-weight: 700;
  font-size: 0.92rem;
}

.sheet-title {
  margin: 18px 0 10px;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 1;
}

.sheet-lead {
  margin: 0;
  max-width: 920px;
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.9);
}

.sheet-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 0.9rem;
  font-weight: 700;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.summary-grid,
.sheet-grid,
.hub-grid {
  display: grid;
  gap: 16px;
}

.summary-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 18px;
}

.summary-card,
.sheet-card,
.hub-card,
.sheet-footer,
.section-block {
  background: var(--paper-strong);
  border-radius: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.summary-card {
  padding: 18px;
}

.summary-card h2 {
  margin: 0 0 6px;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-deep);
}

.summary-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.6;
}

.sheet-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 20px;
}

.sheet-card {
  overflow: hidden;
}

.sheet-card h2 {
  margin: 0;
  padding: 14px 18px;
  font-size: 1.08rem;
  background: linear-gradient(180deg, #dcfce7 0%, #bbf7d0 100%);
  border-bottom: 1px solid var(--line);
}

.sheet-card p {
  margin: 0;
  padding: 16px 18px 0;
  color: var(--muted);
  line-height: 1.6;
}

.sheet-card pre {
  margin: 14px 18px 18px;
  padding: 16px;
  border-radius: 18px;
  background: var(--code-bg);
  color: var(--code-text);
  font: 600 0.88rem/1.58 "SFMono-Regular", Consolas, Menlo, monospace;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.sheet-footer {
  margin-top: 20px;
  padding: 22px;
}

.sheet-footer h2,
.section-block h2,
.hub-section-title {
  margin: 0 0 10px;
  font-size: 1.25rem;
}

.sheet-footer ul,
.section-block ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.sheet-footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.footer-box {
  padding: 16px;
  border-radius: 18px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.footer-box h3 {
  margin: 0 0 8px;
  color: var(--purple);
}

.hub-intro {
  margin-top: 18px;
  padding: 20px 22px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
}

.hub-intro p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.hub-section {
  margin-top: 22px;
}

.hub-section-title {
  margin-bottom: 12px;
}

.hub-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hub-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
}

.hub-card h3 {
  margin: 0 0 10px;
  font-size: 1.18rem;
}

.hub-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.hub-card .pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.hub-card .mini-pill {
  display: inline-flex;
  padding: 7px 10px;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--purple);
  font-size: 0.82rem;
  font-weight: 700;
}

.hub-card .card-link {
  margin-top: auto;
  padding-top: 18px;
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.section-block {
  margin-top: 22px;
  padding: 22px;
}

.section-block p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.7;
}

@media (max-width: 1120px) {
  .summary-grid,
  .sheet-grid,
  .hub-grid,
  .sheet-footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .sheet-page {
    padding: 16px 10px 28px;
  }

  .summary-grid,
  .sheet-grid,
  .hub-grid,
  .sheet-footer-grid {
    grid-template-columns: 1fr;
  }

  .sheet-hero {
    padding: 22px 18px;
  }
}

@media print {
  body {
    background: #ffffff;
  }

  .sheet-page {
    max-width: none;
    padding: 0;
  }

  .sheet-hero,
  .summary-card,
  .sheet-card,
  .sheet-footer,
  .hub-card,
  .section-block {
    box-shadow: none;
    break-inside: avoid;
  }
}