:root {
  --bg: #f5efe3;
  --panel: rgba(255, 250, 242, 0.92);
  --ink: #1f1a17;
  --muted: #64584f;
  --line: rgba(76, 59, 45, 0.16);
  --burnt: #b6512f;
  --burnt-deep: #7f2d18;
  --olive: #7d8b48;
  --sea: #1f6f78;
  --shadow: 0 24px 60px rgba(88, 60, 34, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(182, 81, 47, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(31, 111, 120, 0.14), transparent 26%),
    linear-gradient(180deg, #fbf6ee 0%, var(--bg) 52%, #efe6d4 100%);
}

.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.hero,
.section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero {
  padding: 42px 40px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -80px -90px auto;
  width: 260px;
  height: 260px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(125, 139, 72, 0.18), transparent 68%);
}

.eyebrow,
.section-kicker,
.proof-tag {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  font-weight: 700;
}

.eyebrow,
.section-kicker {
  color: var(--burnt-deep);
  margin: 0 0 14px;
}

h1,
h2 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  font-weight: 700;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(42px, 7vw, 76px);
  line-height: 0.95;
  max-width: 760px;
}

h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.02;
}

.hero-copy,
.section-note,
.proof-copy,
.compare-outcome span,
.flow-card span {
  color: var(--muted);
}

.hero-copy {
  max-width: 760px;
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.hero-actions a,
.link-list a {
  text-decoration: none;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--burnt-deep);
  text-decoration: none;
  font-weight: 700;
}

.primary,
.secondary {
  border-radius: 999px;
  padding: 13px 18px;
  font-weight: 700;
}

.primary {
  background: var(--burnt);
  color: #fff9f3;
}

.secondary {
  background: rgba(255, 255, 255, 0.68);
  color: var(--ink);
  border: 1px solid var(--line);
}

main {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.section {
  padding: 30px 28px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  margin-bottom: 20px;
}

.signal-grid,
.proof-grid,
.command-grid,
.link-list,
.guide-nav,
.detail-grid {
  display: grid;
  gap: 16px;
}

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

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

.signal-card,
.proof-card,
.command-card,
.compare-card,
.flow-card,
.guide-card,
.detail-card {
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.62);
}

.signal-card {
  padding: 20px;
}

.guide-card,
.detail-card {
  padding: 20px;
}

.guide-card {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.guide-card:hover {
  border-color: rgba(182, 81, 47, 0.42);
  transform: translateY(-1px);
}

.static-card {
  cursor: default;
}

.static-card span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-weight: 500;
  line-height: 1.6;
}

.signal-card.hot {
  background: linear-gradient(180deg, rgba(182, 81, 47, 0.14), rgba(255, 255, 255, 0.78));
}

.signal-label,
.compare-title,
.command-title,
.detail-card h3 {
  display: block;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--burnt-deep);
  margin-bottom: 12px;
  font-weight: 700;
}

.signal-card p,
.compare-card li,
.proof-card p,
.command-card code,
.detail-card p,
.detail-card li {
  margin: 0;
}

.detail-card h3 {
  margin-top: 0;
}

.detail-card p {
  color: var(--muted);
  line-height: 1.7;
}

.detail-card ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: var(--muted);
}

.detail-card pre {
  margin: 0;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(31, 26, 23, 0.06);
  overflow: auto;
}

.detail-card code,
.mono {
  font-family: "SFMono-Regular", "Menlo", monospace;
  font-size: 14px;
}

.mono {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  overflow-wrap: anywhere;
  word-break: break-all;
}

.demo-triptych,
.protocol-grid,
.result-grid {
  display: grid;
  gap: 16px;
}

.demo-triptych {
  grid-template-columns: 1.5fr 1fr 1fr;
}

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

.result-grid {
  grid-template-columns: 1.3fr 1fr 1fr;
}

.chat-panel,
.summary-panel,
.step-card,
.result-panel {
  border-radius: 24px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.64);
  padding: 22px;
}

.summary-panel.accent,
.hero-result {
  background: linear-gradient(180deg, rgba(182, 81, 47, 0.12), rgba(255, 255, 255, 0.82));
}

.chat-thread {
  display: grid;
  gap: 14px;
}

.message {
  display: grid;
  gap: 8px;
}

.message.buyer {
  justify-items: start;
}

.message.guard {
  justify-items: end;
}

.message-meta,
.summary-label,
.metric-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--burnt-deep);
  font-weight: 700;
}

.bubble {
  max-width: 86%;
  padding: 14px 16px;
  border-radius: 18px;
  line-height: 1.7;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
}

.message.guard .bubble {
  background: rgba(182, 81, 47, 0.1);
}

.summary-panel h3,
.step-card h3,
.result-panel h3 {
  margin: 0 0 10px;
  font-family: "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  font-size: 26px;
  line-height: 1.08;
}

.summary-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: var(--muted);
}

.summary-copy,
.inline-note {
  margin-top: 16px;
  color: var(--muted);
  line-height: 1.7;
}

.step-number {
  display: inline-flex;
  width: 36px;
  height: 36px;
  border-radius: 999px;
  align-items: center;
  justify-content: center;
  background: rgba(182, 81, 47, 0.12);
  color: var(--burnt-deep);
  font-weight: 800;
  margin-bottom: 12px;
}

.step-card p,
.result-panel p {
  color: var(--muted);
  line-height: 1.7;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.metric-card {
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  padding: 14px;
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 22px;
}

.code-strip {
  margin-top: 16px;
  border-radius: 16px;
  background: rgba(31, 26, 23, 0.06);
  padding: 14px 16px;
  font-family: "SFMono-Regular", "Menlo", monospace;
  font-size: 14px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.flow-rail {
  display: grid;
  grid-template-columns: 1.2fr 0.75fr 1.35fr 0.9fr 1.1fr 0.75fr 1.2fr;
  gap: 12px;
  align-items: stretch;
}

.flow-card {
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 130px;
}

.flow-card strong {
  font-size: 20px;
  margin-bottom: 8px;
}

.flow-card.emphasis {
  background: linear-gradient(180deg, rgba(182, 81, 47, 0.18), rgba(255, 255, 255, 0.78));
}

.flow-card.compact {
  min-height: 58px;
}

.flow-card.dark {
  background: rgba(31, 111, 120, 0.1);
}

.flow-stack {
  display: grid;
  gap: 12px;
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--burnt-deep);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  position: relative;
  padding: 0 6px;
}

.flow-arrow::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, rgba(182, 81, 47, 0.35), rgba(182, 81, 47, 0.9));
}

.flow-arrow::after {
  content: "";
  position: absolute;
  right: 10%;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--burnt);
  border-right: 2px solid var(--burnt);
  transform: rotate(45deg);
}

.flow-arrow span {
  background: var(--panel);
  padding: 0 8px;
  z-index: 1;
}

.flow-arrow.dual::before {
  background: linear-gradient(90deg, rgba(31, 111, 120, 0.35), rgba(125, 139, 72, 0.88));
}

.compare-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.compare-card {
  padding: 22px;
}

.compare-card.accent {
  background: linear-gradient(180deg, rgba(125, 139, 72, 0.16), rgba(255, 255, 255, 0.8));
}

.compare-card ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
}

.compare-outcome {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 6px;
}

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

.proof-card {
  padding: 20px;
}

.proof-tag {
  color: var(--sea);
}

.proof-value {
  margin-top: 12px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  word-break: break-all;
}

.proof-copy {
  margin-top: 10px;
  line-height: 1.6;
}

.proof-meta {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.mono-link a {
  color: var(--sea);
  text-decoration: none;
}

.mono-link a:hover {
  text-decoration: underline;
}

.full-proof-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.proof-card-large {
  padding: 22px;
}

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

.command-card {
  padding: 18px 20px;
}

.command-card code {
  display: block;
  font-size: 16px;
  line-height: 1.55;
  white-space: pre-wrap;
  color: var(--ink);
}

.links-section .link-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.link-list a {
  display: block;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.64);
  color: var(--ink);
  font-weight: 700;
}

@media (max-width: 1040px) {
  .signal-grid,
  .proof-grid,
  .command-grid,
  .links-section .link-list,
  .compare-grid,
  .guide-nav,
  .detail-grid,
  .demo-triptych,
  .protocol-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .flow-rail {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    min-height: 46px;
  }

  .flow-arrow::before {
    left: 50%;
    right: auto;
    top: 12%;
    bottom: 12%;
    width: 2px;
    height: auto;
  }

  .flow-arrow::after {
    top: auto;
    right: auto;
    bottom: 12%;
    left: calc(50% - 5px);
    transform: rotate(135deg);
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 20px, 100%);
    padding: 18px 0 34px;
  }

  .hero,
  .section {
    padding: 22px 18px;
    border-radius: 22px;
  }

  .hero-copy {
    font-size: 16px;
  }

  .section-head {
    display: block;
  }
}