:root {
  color-scheme: light;
  --ink: #17201d;
  --muted: #64716b;
  --line: #d8ded7;
  --paper: #f8f3e8;
  --surface: #fffdf7;
  --surface-2: #eef4ed;
  --green: #1f6b4a;
  --teal: #1f7a74;
  --blue: #2e5d8f;
  --gold: #ad7b21;
  --rose: #a7473f;
  --shadow: 0 18px 48px rgba(35, 42, 35, .13);
  --radius: 8px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #eef5ed;
  --muted: #b8c5bc;
  --line: #33423a;
  --paper: #121713;
  --surface: #1c241f;
  --surface-2: #233129;
  --green: #58b987;
  --teal: #62c5bc;
  --blue: #85aee3;
  --gold: #d6ad61;
  --rose: #d47971;
  --shadow: 0 18px 48px rgba(0, 0, 0, .32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Inter, system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

body.modal-open {
  overflow: hidden;
}

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

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface-2);
}

.view-enter main {
  animation: viewIn .28s ease both;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px clamp(16px, 4vw, 58px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  background: color-mix(in srgb, var(--paper) 91%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: white;
  background: linear-gradient(135deg, var(--green), var(--blue));
  font-weight: 900;
}

.brand b {
  display: block;
  font-size: 16px;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.topbar nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  max-width: 100%;
  scrollbar-width: none;
}

.topbar nav::-webkit-scrollbar,
.chapter-rail::-webkit-scrollbar {
  display: none;
}

.topbar nav a {
  flex: 0 0 auto;
  padding: 8px 11px;
  border-radius: 7px;
  color: var(--muted);
}

.topbar nav a:hover {
  color: var(--ink);
  background: var(--surface-2);
}

main {
  min-height: calc(100vh - 128px);
}

section {
  padding: 24px clamp(16px, 4vw, 58px);
}

footer {
  padding: 24px clamp(16px, 4vw, 58px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.home-shell {
  padding-top: 18px;
}

.hero-banner {
  min-height: min(74vh, 690px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  border-radius: var(--radius);
  background:
    linear-gradient(90deg, rgba(18, 27, 24, .82), rgba(18, 27, 24, .34)),
    var(--hero-image) center / cover;
  box-shadow: var(--shadow);
}

.hero-copy {
  max-width: 880px;
  padding: clamp(24px, 6vw, 64px);
  color: white;
}

.hero-copy .eyebrow {
  color: #b9f2d3;
}

.hero-copy h1 {
  margin: 8px 0 16px;
  font-size: clamp(48px, 13vw, 112px);
  line-height: .96;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 0 0 22px;
  font-size: clamp(18px, 2.2vw, 24px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.actions,
.card-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.primary,
.secondary,
.card-actions a,
.stage-card a,
.stage-card button,
.book-cta,
.answer-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, opacity .18s ease;
}

.primary,
.book-cta {
  border-color: var(--green);
  color: white;
  background: var(--green);
  box-shadow: 0 10px 22px color-mix(in srgb, var(--green) 28%, transparent);
}

.secondary {
  background: var(--surface-2);
}

.primary:hover,
.secondary:hover,
.card-actions a:hover,
.stage-card a:hover,
.book-cta:hover,
.answer-toggle:hover {
  transform: translateY(-1px);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(92px, 1fr));
  gap: 10px;
  max-width: 680px;
  margin-top: 24px;
}

.stats span {
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, .32);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .14);
  backdrop-filter: blur(10px);
}

.stats b {
  display: block;
  font-size: 28px;
  line-height: 1.1;
}

.section-stack {
  display: grid;
  gap: 14px;
}

.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
}

.section-title h2,
.reading-section h2,
.book-recommendation h2 {
  margin: 0;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.15;
  letter-spacing: 0;
}

.section-title a,
.section-title span {
  color: var(--muted);
  font-size: 14px;
}

.starter-grid,
.domain-grid,
.stage-grid,
.book-grid,
.roadmap,
.concept-grid {
  display: grid;
  gap: 14px;
}

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

.domain-grid,
.book-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

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

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

.chapter-rail {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  padding-bottom: 8px;
}

.chapter-rail.padded {
  padding-top: 0;
}

.chapter-card {
  position: relative;
  flex: 0 0 min(82vw, 300px);
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  padding: 20px;
  border-radius: var(--radius);
  color: white;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, .08), rgba(0, 0, 0, .74)),
    var(--chapter-image) center / cover;
  box-shadow: var(--shadow);
  scroll-snap-align: start;
}

.chapter-card small {
  color: #f1d393;
  font-weight: 900;
}

.chapter-card strong {
  margin-top: 8px;
  font-size: 25px;
  line-height: 1.15;
}

.chapter-card span {
  margin-top: 6px;
  color: rgba(255, 255, 255, .82);
}

.domain-card,
.stage-card,
.book-card,
.roadmap article,
.exercise,
.module,
.store,
.split > div,
.concept-card,
.locked-panel > div,
.admin-login,
.result {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(22, 32, 28, .06);
}

.domain-card,
.stage-card,
.book-card,
.roadmap article,
.exercise,
.module,
.store,
.split > div,
.concept-card,
.locked-panel > div,
.result {
  padding: 18px;
}

.domain-card {
  position: relative;
  min-height: 260px;
  display: flex;
  flex-direction: column;
}

.domain-card.compact {
  min-height: 230px;
}

.domain-card small,
.book-card small,
.exercise small {
  max-width: calc(100% - 42px);
  color: var(--gold);
  font-weight: 800;
}

.domain-card h3,
.book-card h3,
.stage-card h2,
.concept-card h3,
.exercise h3 {
  margin: 8px 0;
  line-height: 1.25;
  letter-spacing: 0;
}

.domain-card h3 {
  font-size: 22px;
}

.domain-card p,
.book-card p,
.stage-card p,
.result p {
  color: var(--muted);
}

.domain-card p {
  flex: 1;
}

.fav {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  color: var(--gold);
  background: var(--surface-2);
  cursor: pointer;
}

.mini-progress {
  height: 7px;
  overflow: hidden;
  margin: 10px 0 14px;
  border-radius: 999px;
  background: var(--surface-2);
}

.mini-progress i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--blue));
}

.page-head,
.reader-head {
  max-width: 980px;
  padding-top: 44px;
}

.page-head h1,
.reader-head h1 {
  margin: 6px 0 12px;
  font-size: clamp(34px, 7vw, 66px);
  line-height: 1.08;
  letter-spacing: 0;
}

.page-head p,
.reader-head p {
  font-size: 18px;
  color: var(--muted);
}

.tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-top: 0;
}

.tools input {
  flex: 1;
  min-width: min(100%, 310px);
  height: 48px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: var(--surface);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tabs a {
  min-width: 40px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  text-align: center;
  background: var(--surface);
}

.tabs .active {
  color: white;
  border-color: var(--ink);
  background: var(--ink);
}

.stage-progress {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}

.stage-progress a {
  position: relative;
  display: grid;
  gap: 2px;
  min-height: 86px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.stage-progress a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 0;
  height: 3px;
  background: var(--line);
}

.stage-progress a.active::after,
.stage-progress a.done::after {
  background: linear-gradient(90deg, var(--green), var(--teal));
}

.stage-progress span {
  font-size: 22px;
}

.stage-progress b {
  font-size: 17px;
}

.stage-progress small {
  color: var(--muted);
}

.stage-progress .locked {
  color: var(--muted);
  background: color-mix(in srgb, var(--surface-2) 68%, var(--surface));
  filter: grayscale(.35);
  opacity: .72;
  pointer-events: none;
}

.stage-card h2 {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 27px;
}

.stage-card.locked {
  opacity: .64;
  filter: grayscale(.45);
}

.stage-card button:disabled,
.book-cta.disabled {
  color: var(--muted);
  border-color: var(--line);
  background: var(--surface-2);
  box-shadow: none;
  cursor: not-allowed;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .78fr);
  gap: 14px;
}

.split h2,
.store h2 {
  margin-top: 0;
}

.store {
  background: color-mix(in srgb, var(--surface) 78%, var(--gold) 9%);
}

.reader-shell {
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-2) 70%, transparent), transparent);
}

.reader-head {
  margin: 0 auto;
}

.reader-head p,
.reading-section,
.reader-meta,
.split {
  font-size: 18px;
}

.reading-section {
  max-width: 1060px;
  margin: 0 auto;
}

.reading-section h2 {
  margin-bottom: 14px;
}

.section-kicker {
  margin-bottom: 6px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.benchmark {
  max-width: 900px;
  padding: 14px 16px;
  border-left: 4px solid var(--green);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink);
  background: color-mix(in srgb, var(--surface-2) 78%, transparent);
  font-weight: 700;
}

.module-list,
.exercise-list,
.results {
  display: grid;
  gap: 12px;
}

.module summary {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 12px;
  align-items: center;
  cursor: pointer;
}

.module summary span,
.roadmap span,
.concept-card span,
.lock-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: white;
  background: var(--green);
  font-weight: 900;
}

.module summary small {
  color: var(--muted);
}

.module li,
.split li {
  margin: 8px 0;
}

.academic-depth,
.common-mistake {
  padding: 12px;
  border-radius: 7px;
  background: var(--surface-2);
}

.common-mistake {
  border-left: 3px solid var(--rose);
}

.checks {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.checks label {
  display: flex;
  gap: 8px;
}

.concept-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.concept-card p {
  color: var(--muted);
}

.wide-grid,
.framework-grid,
.method-list,
.case-grid,
.debate-list,
.glossary-grid,
.capstone-layout {
  display: grid;
  gap: 14px;
}

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

.framework-grid,
.case-grid,
.glossary-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.method-list {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.capstone-layout {
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
}

.wide-grid article,
.framework-card,
.method-card,
.case-card,
.debate-card,
.glossary-grid article,
.capstone article {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(22, 32, 28, .05);
}

.wide-grid h3,
.framework-card h3,
.method-card h3,
.case-card h3,
.debate-card h3,
.glossary-grid strong,
.capstone h3 {
  margin-top: 0;
}

.framework-card small,
.case-card small,
.debate-card small {
  display: block;
  padding-top: 10px;
  color: var(--gold);
  font-weight: 800;
}

.method-card ol,
.capstone ol {
  padding-left: 22px;
}

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

.debate-columns p {
  margin: 0;
  padding: 12px;
  border-radius: 7px;
  background: var(--surface-2);
}

.glossary-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.exercise .options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.exercise .options button {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: var(--surface-2);
}

.answer {
  display: none;
  padding: 12px;
  border-radius: 7px;
  background: var(--surface-2);
}

.answer.show {
  display: block;
  animation: slideFade .22s ease both;
}

textarea {
  width: 100%;
  min-height: 260px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: var(--surface);
  resize: vertical;
}

.locked-panel {
  display: grid;
  min-height: 42vh;
  place-items: center;
}

.locked-panel > div {
  max-width: 560px;
  text-align: center;
}

.lock-icon {
  margin: 0 auto 12px;
  background: var(--muted);
}

.book-recommendation {
  margin-top: 10px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-2) 74%, transparent), transparent);
}

.recommend-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.recommend-head p {
  margin: 4px 0 0;
  color: var(--muted);
}

.store-entry {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 360px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: zoom-in;
  text-align: left;
}

.store-entry img {
  width: 74px;
  height: 74px;
  flex: 0 0 auto;
  border-radius: 7px;
  object-fit: cover;
}

.store-entry span {
  font-weight: 800;
  line-height: 1.35;
}

.book-card {
  display: flex;
  flex-direction: column;
  min-height: 260px;
  transition: transform .18s ease, box-shadow .18s ease;
}

.book-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.book-card .author {
  margin: 0;
  color: var(--gold);
  font-weight: 800;
}

.book-card p:not(.author) {
  flex: 1;
}

.book-cta {
  width: 100%;
  margin-top: auto;
}

.commercial-empty,
.empty {
  padding: 18px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: color-mix(in srgb, var(--surface) 74%, transparent);
}

.roadmap {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.roadmap article h2 {
  margin-bottom: 4px;
}

.dashboard {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 24px;
}

.ring {
  position: relative;
  display: grid;
  place-items: center;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: conic-gradient(var(--green) calc(var(--p) * 1%), var(--surface-2) 0);
}

.ring::before {
  content: "";
  position: absolute;
  inset: 22px;
  border-radius: inherit;
  background: var(--paper);
}

.ring b,
.ring span {
  position: relative;
}

.ring b {
  font-size: 42px;
  line-height: 1;
}

.ring span {
  margin-top: 58px;
  color: var(--muted);
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.badges span {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
}

.result {
  display: block;
}

.result strong {
  display: block;
  font-size: 20px;
}

.admin-login {
  max-width: 460px;
  margin: 7vh auto;
  padding: 26px;
}

.admin-login input {
  width: 100%;
  height: 46px;
  margin-bottom: 12px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: var(--surface);
}

.admin-table {
  overflow: auto;
}

.admin-table table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

.admin-table th,
.admin-table td {
  padding: 11px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.loading-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.loading-screen div {
  text-align: center;
}

.loading-screen span {
  display: inline-block;
  width: 42px;
  height: 42px;
  border: 4px solid var(--line);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(0, 0, 0, .55);
  opacity: 0;
  transition: opacity .18s ease;
}

.modal.show {
  opacity: 1;
}

.modal-panel {
  position: relative;
  width: min(100%, 420px);
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
  box-shadow: var(--shadow);
  transform: translateY(14px) scale(.98);
  transition: transform .2s ease;
}

.modal.show .modal-panel {
  transform: translateY(0) scale(1);
}

.modal-panel h2 {
  margin: 0 0 12px;
  line-height: 1.25;
}

.modal-panel img {
  width: min(300px, 88vw);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.modal-hint {
  color: var(--green);
  font-weight: 900;
  animation: pulseText 1.2s ease-in-out infinite;
}

.icon.close {
  position: absolute;
  top: 8px;
  right: 8px;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  color: var(--ink);
  background: var(--surface-2);
  cursor: pointer;
}

#toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 60;
  padding: 10px 16px;
  border-radius: 7px;
  color: white;
  background: #17201d;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(18px);
  transition: opacity .2s ease, transform .2s ease;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@keyframes viewIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideFade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseText {
  0%, 100% {
    opacity: .72;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(-1px);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 920px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-banner {
    min-height: 620px;
  }

  .starter-grid,
  .stage-grid,
  .split,
  .dashboard,
  .wide-grid,
  .capstone-layout,
  .debate-columns {
    grid-template-columns: 1fr;
  }

  .recommend-head {
    align-items: stretch;
    flex-direction: column;
  }

  .store-entry {
    max-width: none;
  }
}

@media (max-width: 620px) {
  section {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero-banner {
    min-height: 560px;
  }

  .hero-copy {
    padding: 24px;
  }

  .stats,
  .stage-progress {
    grid-template-columns: 1fr;
  }

  .chapter-card {
    flex-basis: 84vw;
    min-height: 320px;
  }

  .module summary {
    grid-template-columns: 42px 1fr;
  }

  .module summary small {
    grid-column: 2;
  }

  .reader-head p,
  .reading-section,
  .reader-meta,
  .split {
    font-size: 17px;
  }
}