:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-soft: #f1f5f9;
  --ink: #111827;
  --muted: #5b6472;
  --line: #d9dee7;
  --blue: #2563eb;
  --violet: #7c3aed;
  --green: #0f9f6e;
  --amber: #b7791f;
  --shadow: 0 18px 55px rgba(17, 24, 39, 0.08);
  --radius: 8px;
  --sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(247, 248, 250, 0.92)),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

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

button {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 5vw, 64px);
  background: rgba(255, 255, 255, 0.84);
  border-bottom: 1px solid rgba(217, 222, 231, 0.8);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 650;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  transition: color 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--blue);
  outline: none;
}

.nav-links .nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: var(--radius);
  background: var(--blue);
  color: #ffffff;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.22);
  transition:
    background 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.nav-links .nav-cta:hover,
.nav-links .nav-cta:focus-visible {
  background: #1d4ed8;
  color: #ffffff;
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.28);
  transform: translateY(-1px);
}

main {
  overflow: hidden;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  gap: 32px;
  min-height: min(760px, calc(100vh - 190px));
  padding: clamp(34px, 5vw, 58px) clamp(18px, 5vw, 64px) 34px;
  align-items: center;
}

.intro-panel {
  max-width: 690px;
}

.eyebrow,
.small-label {
  margin: 0 0 12px;
  color: var(--blue);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  max-width: 660px;
  font-family: var(--serif);
  font-size: clamp(42px, 6.5vw, 88px);
  font-weight: 500;
  line-height: 1.03;
  letter-spacing: 0;
}

.lede {
  max-width: 580px;
  color: var(--muted);
  font-size: 18px;
}

.quick-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.quick-stats span {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  min-height: 42px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
}

.quick-stats strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
}

.map-panel {
  min-width: 0;
  padding: clamp(12px, 2vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.map-panel img,
.branch-layout img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.control-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 0 clamp(18px, 5vw, 64px);
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 10px 35px rgba(17, 24, 39, 0.05);
}

.track-tabs,
.pace-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pace-control {
  color: var(--muted);
  font-size: 14px;
}

.track-tab,
.pace-button {
  min-height: 38px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition:
    border-color 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.track-tab {
  padding: 0 18px;
}

.pace-button {
  min-width: 46px;
  padding: 0 10px;
}

.track-tab:hover,
.pace-button:hover,
.track-tab:focus-visible,
.pace-button:focus-visible {
  border-color: var(--line);
  color: var(--ink);
  outline: none;
}

.track-tab.active,
.pace-button.active {
  border-color: rgba(37, 99, 235, 0.26);
  background: #eaf1ff;
  color: var(--blue);
}

.roadmap-section,
.branches-section,
.resource-section {
  padding: 86px clamp(18px, 5vw, 64px);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(220px, 0.75fr) minmax(280px, 1.25fr);
  gap: 30px;
  margin-bottom: 30px;
  align-items: end;
}

.section-heading.compact {
  align-items: start;
}

.section-heading h2 {
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 58px);
  font-weight: 500;
  line-height: 1.05;
}

.section-heading p:last-child {
  margin-bottom: 6px;
  color: var(--muted);
}

.roadmap-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 22px;
}

.progress-panel {
  position: sticky;
  top: 94px;
  align-self: start;
  display: grid;
  gap: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.progress-panel strong {
  display: block;
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 500;
  line-height: 1.2;
}

.progress-panel p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.progress-ring {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto;
}

.progress-ring svg {
  display: block;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg,
.ring-value {
  fill: none;
  stroke-width: 10;
}

.ring-bg {
  stroke: var(--surface-soft);
}

.ring-value {
  stroke: var(--blue);
  stroke-linecap: round;
  stroke-dasharray: 301.59;
  stroke-dashoffset: 301.59;
  transition: stroke-dashoffset 260ms ease;
}

.progress-ring span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 30px;
}

.stage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-items: start;
}

.stage-card,
.branch-card,
.resource-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.stage-card {
  display: grid;
  grid-template-rows: auto auto auto auto;
  gap: 18px;
  min-height: 300px;
  padding: 22px;
  transition:
    border-color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.stage-card:hover {
  border-color: rgba(37, 99, 235, 0.36);
  box-shadow: 0 14px 38px rgba(17, 24, 39, 0.07);
  transform: translateY(-2px);
}

.stage-card.done {
  border-color: rgba(15, 159, 110, 0.42);
  background: linear-gradient(180deg, #ffffff, #f5fffb);
}

.stage-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.stage-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.pill.builder {
  border-color: rgba(124, 58, 237, 0.25);
  color: var(--violet);
}

.pill.cli {
  border-color: rgba(37, 99, 235, 0.26);
  color: var(--blue);
}

.pill.shared {
  border-color: rgba(15, 159, 110, 0.24);
  color: var(--green);
}

.stage-card h3 {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 520;
  line-height: 1.18;
}

.stage-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.check-button {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: transparent;
  cursor: pointer;
  transition:
    background 180ms ease,
    border-color 180ms ease,
    color 180ms ease;
}

.check-button::before {
  content: "";
  display: block;
  width: 12px;
  height: 7px;
  margin: 11px auto 0;
  border-left: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
}

.stage-card.done .check-button {
  border-color: var(--green);
  background: var(--green);
  color: #ffffff;
}

.focus-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.focus-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.focus-list li::before {
  content: "";
  flex: 0 0 5px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
}

.detail-block {
  margin-top: 15px;
}

.detail-block h4 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 750;
}

.detail-block ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 14px;
}

.detail-block p {
  color: var(--muted);
  font-size: 14px;
}

.resource-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.resource-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 12px;
}

.stage-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.stage-actions a {
  color: var(--blue);
  font-size: 14px;
  font-weight: 650;
}

.stage-actions span {
  color: var(--muted);
  font-size: 13px;
}

.branch-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: 22px;
  align-items: start;
}

.branch-layout > img {
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.branch-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.branch-card,
.resource-card {
  padding: 20px;
}

.branch-card span,
.resource-card span {
  display: block;
  margin-bottom: 16px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.branch-card h3,
.resource-card h3 {
  margin-bottom: 8px;
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 520;
  line-height: 1.2;
}

.branch-card p,
.resource-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

a.branch-card {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

a.branch-card:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
  box-shadow: 0 8px 24px -12px rgba(0, 0, 0, 0.15);
}

.branch-card-cta {
  display: block !important;
  margin-top: 14px;
  margin-bottom: 0 !important;
  color: var(--blue) !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  letter-spacing: 0 !important;
  text-transform: none !important;
}

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

.site-footer {
  padding: 30px clamp(18px, 5vw, 64px) 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer a {
  color: var(--blue);
  font-weight: 650;
}

.site-footer .source-link {
  color: var(--muted);
  font-weight: 400;
  font-size: 12px;
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.site-footer .source-link:hover {
  opacity: 1;
  text-decoration: underline;
}

.detail-page {
  padding: 64px clamp(18px, 5vw, 64px) 90px;
}

.doc-shell {
  max-width: 980px;
}

.detail-hero {
  max-width: 920px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 650;
}

.detail-hero .stage-kicker {
  margin-bottom: 18px;
}

.detail-hero h1 {
  margin-bottom: 18px;
  max-width: 780px;
}

.detail-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 22px;
  align-items: start;
  margin-top: 40px;
}

.detail-main,
.detail-side {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.detail-main {
  padding: clamp(22px, 4vw, 38px);
}

.detail-side {
  position: sticky;
  top: 94px;
  display: grid;
  gap: 26px;
  padding: 22px;
}

.detail-main .detail-block:first-child,
.detail-side > div:first-child {
  margin-top: 0;
}

.detail-main .detail-block + .detail-block {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.detail-block h2,
.detail-side h2 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 520;
  line-height: 1.18;
}

.detail-side h2 {
  font-size: 21px;
}

.detail-main .detail-block ul {
  gap: 10px;
  padding-left: 22px;
  font-size: 16px;
}

.detail-main .detail-block p {
  font-size: 16px;
}

.markdown-body {
  max-width: 980px;
  color: var(--ink);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-family: var(--serif);
  font-weight: 520;
  line-height: 1.18;
}

.markdown-body h1 {
  margin: 10px 0 18px;
  font-size: clamp(38px, 5vw, 70px);
}

.markdown-body h2 {
  margin: 44px 0 16px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-size: clamp(28px, 3.2vw, 42px);
}

.markdown-body h3 {
  margin: 32px 0 12px;
  font-size: 25px;
}

.markdown-body h4 {
  margin: 26px 0 10px;
  font-size: 20px;
}

.markdown-body p,
.markdown-body li {
  color: var(--muted);
  font-size: 16px;
}

.markdown-body p {
  margin-bottom: 16px;
}

.markdown-body ul,
.markdown-body ol {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
  padding-left: 24px;
}

.markdown-body a {
  color: var(--blue);
  font-weight: 650;
}

.disabled-link {
  color: var(--muted);
  font-weight: 650;
}

.markdown-body blockquote {
  margin: 18px 0;
  padding: 16px 18px;
  border-left: 4px solid rgba(37, 99, 235, 0.28);
  background: var(--surface);
  color: var(--muted);
}

.markdown-body blockquote > :last-child {
  margin-bottom: 0;
}

.markdown-body pre {
  overflow-x: auto;
  margin: 18px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0f172a;
  color: #e5edf7;
  font-size: 14px;
  line-height: 1.6;
}

.markdown-body code {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--surface-soft);
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92em;
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: inherit;
}

.markdown-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 18px 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.table-wrap {
  overflow-x: auto;
  margin: 18px 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

.markdown-body th,
.markdown-body td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.markdown-body th {
  color: var(--ink);
  font-weight: 750;
  background: var(--surface-soft);
}

.markdown-body td {
  color: var(--muted);
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.task-item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

@media (max-width: 980px) {
  .workspace,
  .roadmap-layout,
  .branch-layout,
  .section-heading,
  .detail-layout {
    grid-template-columns: 1fr;
  }

  .workspace {
    min-height: auto;
  }

  .progress-panel {
    position: static;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
  }

  .detail-side {
    position: static;
  }
}

@media (max-width: 720px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .workspace {
    padding-top: 28px;
  }

  h1 {
    font-size: 42px;
  }

  .detail-page {
    padding-top: 34px;
  }

  .control-band,
  .progress-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .control-band {
    display: grid;
  }

  .track-tabs,
  .pace-control {
    flex-wrap: wrap;
  }

  .stage-grid,
  .branch-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .progress-panel {
    grid-template-columns: 1fr;
  }

  .progress-ring {
    margin: 0;
  }
}