:root {
  --paper: #efe6d3;
  --paper-2: #f6eedf;
  --card: #fbf6ea;
  --ink: #22201b;
  --ink-soft: #5b554a;
  --ink-faint: #887f6f;
  --orange: #d9663a;
  --orange-deep: #b84a23;
  --teal: #2f6f68;
  --gold: #e7b13d;
  --line: rgba(34, 32, 27, 0.18);
  --shadow: 5px 5px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.03) 0.5px, transparent 0.5px);
  background-size: 4px 4px;
  mix-blend-mode: multiply;
  opacity: 0.55;
}

button,
input {
  font: inherit;
}

a {
  color: var(--orange-deep);
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

main,
.top {
  position: relative;
  z-index: 1;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 2px solid var(--ink);
  background: rgba(239, 230, 211, 0.9);
  backdrop-filter: blur(8px);
}

.top .row {
  display: flex;
  max-width: 1180px;
  margin: 0 auto;
  align-items: center;
  gap: 18px;
  padding: 10px 28px;
  flex-wrap: wrap;
}

.brand {
  margin-right: auto;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  font-weight: 900;
}

.brand b,
.nl.active {
  color: var(--orange);
}

.nl {
  padding: 3px 2px;
  border-bottom: 2px solid transparent;
  color: var(--ink-soft);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 700;
}

.nl:hover {
  border-color: var(--orange);
  color: var(--ink);
}

.version {
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  padding: 4px 10px;
  background: var(--card);
  color: var(--ink-soft);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 12px;
}

.hero {
  padding: 72px 28px 42px;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  color: var(--orange-deep);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.6px;
  text-transform: uppercase;
}

.kicker::before {
  width: 42px;
  height: 2px;
  background: var(--orange);
  content: "";
}

.title {
  max-width: 850px;
  margin: 0;
  font-family: "Noto Serif SC", Georgia, "Times New Roman", serif;
  font-size: clamp(42px, 8vw, 86px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.04;
}

.subtitle {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: clamp(16px, 2vw, 20px);
}

.subtitle b,
.sec-lead b {
  color: var(--ink);
  background: linear-gradient(transparent 58%, rgba(231, 177, 61, 0.55) 58%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 20px;
  margin-top: 34px;
}

.brief-card,
.media-card,
.method-card,
.tool,
.route,
.prompt-box,
.code-grid pre {
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.brief-card {
  padding: 22px;
}

.brief-card h2,
.method-card h3,
.route h3 {
  margin: 0 0 12px;
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 21px;
  font-weight: 900;
}

dl {
  display: grid;
  gap: 9px;
  margin: 0;
}

dl div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
}

dt {
  color: var(--ink-faint);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 12px;
  text-transform: uppercase;
}

dd {
  margin: 0;
  font-weight: 700;
}

.purpose ul {
  margin: 0;
  padding-left: 18px;
}

.sec {
  padding: 58px 28px;
  border-top: 2px solid var(--ink);
}

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.sec-num {
  color: var(--orange);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 900;
  line-height: 1;
}

.sec-title {
  margin: 0;
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: clamp(25px, 4vw, 42px);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.sec-lead {
  max-width: 800px;
  margin: 12px 0 30px;
  color: var(--ink-soft);
  font-size: 16.5px;
}

.media-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 0.64fr;
  gap: 18px;
  align-items: start;
}

.media-card {
  overflow: hidden;
}

.media-card img {
  width: 100%;
  border-bottom: 2px solid var(--ink);
  background: #fff;
}

.media-card.cover img {
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

figcaption {
  padding: 14px 16px 16px;
}

figcaption b,
figcaption span {
  display: block;
}

figcaption span {
  color: var(--ink-soft);
  font-size: 13.5px;
}

.pipe-hint {
  margin: 0 0 18px;
  color: var(--ink-faint);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 12px;
}

.rail {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 9px;
}

.node {
  position: relative;
  min-height: 116px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: var(--card);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  text-align: center;
  transition: transform 0.15s ease, background 0.15s ease;
}

.node:hover {
  transform: translateY(-3px);
}

.node.active {
  background: var(--ink);
}

.node.active .n,
.node.active .nm {
  color: var(--paper-2);
}

.node .n {
  display: block;
  color: var(--orange);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
}

.node .nm {
  display: block;
  margin-top: 10px;
  color: var(--ink);
  font-weight: 900;
  line-height: 1.25;
}

.node.gate .star {
  position: absolute;
  top: -10px;
  right: -8px;
  width: 22px;
  height: 22px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-size: 12px;
  line-height: 18px;
}

.drawer {
  overflow: hidden;
  margin-top: 18px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.drawer .inner {
  padding: 25px 28px;
}

.dnum {
  float: left;
  margin: -8px 18px 0 0;
  color: var(--orange);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 54px;
  font-weight: 900;
  line-height: 1;
}

.drawer h3 {
  margin: 0 0 6px;
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 24px;
  font-weight: 900;
}

.ddesc {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.meta-row {
  display: flex;
  gap: 24px;
  padding-top: 14px;
  border-top: 1.5px dashed var(--line);
  flex-wrap: wrap;
}

.lab {
  color: var(--ink-faint);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.val {
  font-weight: 800;
}

code,
pre {
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
}

.method-grid,
.tool-grid,
.route-grid,
.code-grid,
.data-model-grid,
.qa-grid {
  display: grid;
  gap: 16px;
}

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

.method-card,
.tool,
.route {
  padding: 20px;
}

.method-card p,
.tool p {
  color: var(--ink-soft);
  font-size: 14px;
}

.tag {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 2px 8px;
  border-radius: 2px;
  color: #fff;
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 11px;
  font-weight: 800;
}

.tag.auto {
  background: var(--teal);
}

.tag.semi {
  background: var(--orange);
}

.tag.review {
  background: var(--ink);
}

pre {
  overflow-x: auto;
  margin: 14px 0 0;
  padding: 12px 13px;
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper-2);
  font-size: 12px;
  line-height: 1.55;
}

.callout {
  margin-top: 18px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  padding: 16px 18px;
  background: rgba(47, 111, 104, 0.13);
}

.review-surface {
  display: grid;
  grid-template-columns: 1fr 1.18fr 0.78fr;
  gap: 16px;
  align-items: stretch;
}

.player-card,
.transcript-card,
.detail-card {
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: var(--card);
  box-shadow: var(--shadow-sm);
  padding: 16px;
}

.fake-player {
  position: relative;
  display: grid;
  min-height: 230px;
  place-items: center;
  overflow: hidden;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background:
    linear-gradient(135deg, rgba(47, 111, 104, 0.18), transparent 45%),
    linear-gradient(45deg, rgba(217, 102, 58, 0.18), transparent 48%),
    var(--paper-2);
}

.fake-player::before {
  position: absolute;
  inset: 18px;
  border: 1.5px dashed rgba(34, 32, 27, 0.28);
  content: "";
}

.play-triangle {
  z-index: 1;
  width: 0;
  height: 0;
  border-top: 28px solid transparent;
  border-bottom: 28px solid transparent;
  border-left: 44px solid var(--orange);
  filter: drop-shadow(3px 3px 0 var(--ink));
}

.player-caption {
  position: absolute;
  right: 16px;
  bottom: 14px;
  z-index: 1;
  border: 1.5px solid var(--ink);
  border-radius: 2px;
  padding: 4px 8px;
  background: var(--ink);
  color: var(--paper-2);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 11px;
}

.action-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.action-row button {
  min-height: 36px;
  border: 2px solid var(--ink);
  border-radius: 3px;
  background: var(--paper-2);
  box-shadow: 2px 2px 0 var(--ink);
  color: var(--ink);
  cursor: pointer;
  font-weight: 900;
}

.action-row .danger {
  background: var(--orange);
  color: #fff;
}

.transcript-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.row-chip {
  display: flex;
  min-height: 42px;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.row-no {
  display: inline-grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  background: var(--paper-2);
  font-family: Georgia, serif;
  font-weight: 900;
}

.chip {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1.5px solid rgba(34, 32, 27, 0.28);
  border-radius: 3px;
  padding: 3px 8px;
  background: #fffaf0;
  font-weight: 800;
}

.chip.candidate {
  border-color: var(--ink);
  background: var(--gold);
}

.chip.selected {
  background: var(--orange);
  color: #fff;
}

.chip.muted {
  border-style: dashed;
  color: var(--ink-faint);
  text-decoration: line-through;
  text-decoration-color: var(--orange);
}

.time,
.decision {
  color: var(--ink-faint);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 11px;
}

.decision {
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 2px 6px;
  background: var(--paper-2);
  color: var(--orange-deep);
}

.timeline-strip {
  position: relative;
  height: 44px;
  margin-top: auto;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background:
    repeating-linear-gradient(90deg, rgba(34, 32, 27, 0.12) 0 1px, transparent 1px 28px),
    var(--paper-2);
}

.timeline-strip span {
  position: absolute;
  top: 9px;
  bottom: 9px;
  border: 2px solid var(--ink);
  border-radius: 2px;
  background: var(--orange);
  box-shadow: 2px 2px 0 var(--ink);
}

.detail-card h3 {
  margin: 0 0 12px;
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 20px;
  font-weight: 900;
}

.detail-card dl {
  gap: 11px;
}

.detail-card dl div {
  grid-template-columns: 64px 1fr;
}

.data-model-grid {
  grid-template-columns: repeat(2, 1fr);
  margin-top: 16px;
}

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

.tool.recommended {
  background: linear-gradient(90deg, rgba(217, 102, 58, 0.15), var(--card) 38%);
}

.tname {
  color: var(--orange-deep);
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, monospace;
  font-size: 15px;
  font-weight: 900;
}

.ttag {
  margin: 3px 0 10px;
  color: var(--ink-faint);
  font-size: 12px;
}

.route-grid,
.code-grid {
  grid-template-columns: repeat(2, 1fr);
}

.code-grid pre,
.data-model-grid pre,
.prompt-box {
  background: var(--ink);
  color: var(--paper-2);
}

.route ol {
  margin: 0;
  padding-left: 22px;
}

.prompt-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.prompt-tab {
  border: 2px solid var(--ink);
  border-radius: 3px;
  padding: 8px 13px;
  background: var(--card);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  font-weight: 900;
}

.prompt-tab.active {
  background: var(--ink);
  color: var(--paper-2);
}

.prompt-box {
  min-height: 300px;
  margin: 0;
  white-space: pre-wrap;
}

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

.qa-grid label {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: start;
  border: 2px solid var(--ink);
  border-radius: 4px;
  padding: 13px 14px;
  background: var(--card);
  box-shadow: var(--shadow-sm);
  font-weight: 700;
}

.qa-grid input {
  width: 16px;
  height: 16px;
  accent-color: var(--teal);
  transform: translateY(5px);
}

.ok-stamp {
  width: fit-content;
  margin: 28px auto 0;
  transform: rotate(-5deg);
  border: 4px solid var(--teal);
  border-radius: 5px;
  padding: 6px 22px;
  color: var(--teal);
  font-family: Georgia, serif;
  font-size: 28px;
  font-weight: 900;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .hero-grid,
  .media-grid,
  .method-grid,
  .review-surface,
  .tool-grid,
  .route-grid,
  .code-grid,
  .data-model-grid,
  .qa-grid {
    grid-template-columns: 1fr;
  }

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

  .top .nl {
    display: none;
  }
}

@media (max-width: 560px) {
  .wrap,
  .hero,
  .sec {
    padding-right: 18px;
    padding-left: 18px;
  }

  .title {
    font-size: 40px;
  }

  dl div {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}