:root {
  --bg: #f5f3ea;
  --panel: #fffef9;
  --ink: #102e2a;
  --muted: #697570;
  --line: #d9ddd4;
  --lime: #dff56b;
  --mint: #d9eee6;
  --peach: #ffd8c8;
  --violet: #e4defe;
  --danger: #a43b2b;
  --shadow: 0 18px 50px rgba(16, 46, 42, 0.08);
  font-family: "DM Sans", sans-serif;
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #0d1817;
  --panel: #142522;
  --ink: #edf7f1;
  --muted: #9dafaa;
  --line: #2c413d;
  --lime: #cbe954;
  --mint: #1e3a34;
  --peach: #472d27;
  --violet: #2e2b45;
  --danger: #ff9a87;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.25);
  color-scheme: dark;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}
button,
input,
select {
  font: inherit;
}
button {
  color: inherit;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 13px clamp(16px, 4vw, 54px);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(15px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  background: 0;
  border: 0;
  text-align: left;
  cursor: pointer;
}
.brand > b {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--ink);
  color: var(--lime);
}
.brand span {
  font-weight: 800;
  line-height: 1.05;
}
.brand small {
  display: block;
  color: var(--muted);
  font-size: 10px;
  margin-top: 4px;
}
.topbar nav {
  display: flex;
  justify-content: center;
  gap: 4px;
}
.nav,
.icon-btn,
.timer-pill {
  border: 0;
  background: transparent;
  border-radius: 99px;
  padding: 9px 13px;
  font-weight: 700;
  cursor: pointer;
}
.nav.active {
  background: var(--ink);
  color: var(--panel);
}
.header-tools {
  display: flex;
  gap: 7px;
}
.timer-pill {
  background: var(--lime);
  color: #102e2a;
}
.icon-btn {
  border: 1px solid var(--line);
}
main {
  width: min(1220px, calc(100% - 32px));
  margin: auto;
  padding: 40px 0 80px;
}
.view {
  display: none;
}
.view.active {
  display: block;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.13em;
  font-weight: 800;
  color: var(--muted);
}
h1,
h2 {
  font-family: Fraunces, serif;
}
h1 {
  font-size: clamp(38px, 7vw, 76px);
  line-height: 0.98;
  margin: 12px 0 18px;
  letter-spacing: -0.045em;
}
h1 em {
  font-style: normal;
  color: #5c7241;
}
h2 {
  font-size: clamp(25px, 4vw, 40px);
  margin: 7px 0;
}
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: end;
  padding: 40px 0 54px;
}
.hero p {
  max-width: 620px;
  color: var(--muted);
  font-size: 18px;
}
.hero-score {
  width: 180px;
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  text-align: center;
  border-radius: 50%;
  border: 18px solid var(--mint);
  background: var(--panel);
}
.hero-score strong {
  font: 750 42px Fraunces;
}
.hero-score span {
  font-size: 11px;
  color: var(--muted);
}
.section-title,
.page-head {
  display: flex;
  justify-content: space-between;
  gap: 25px;
  align-items: end;
  margin: 25px 0;
}
.section-title p,
.page-head p {
  color: var(--muted);
  max-width: 460px;
}
.page-head h1 {
  font-size: clamp(38px, 6vw, 62px);
}
select,
input {
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px;
}
.subject-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}
.subject-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 18px;
  padding: 20px;
  text-align: left;
  cursor: pointer;
  transition: 0.2s;
  box-shadow: var(--shadow);
}
.subject-card:hover {
  transform: translateY(-3px);
}
.subject-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.subject-icon {
  font-size: 24px;
  background: var(--mint);
  padding: 10px;
  border-radius: 12px;
}
.subject-card h3 {
  font-size: 21px;
  margin: 17px 0 6px;
}
.subject-card p {
  color: var(--muted);
  min-height: 44px;
}
.progress {
  height: 7px;
  background: var(--bg);
  border-radius: 10px;
  overflow: hidden;
}
.progress i {
  display: block;
  height: 100%;
  background: var(--lime);
}
.subject-foot {
  display: flex;
  justify-content: space-between;
  margin-top: 9px;
  font-size: 12px;
  color: var(--muted);
}
.integrity-note {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 20px;
  margin: 28px 0;
  background: var(--ink);
  color: var(--panel);
  padding: 22px;
  border-radius: 17px;
}
.integrity-note p {
  margin: 0;
  line-height: 1.6;
}
.integrity-note strong {
  color: var(--lime);
}
.study-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  align-items: start;
}
.lesson-nav {
  max-height: 73vh;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 17px;
  padding: 9px;
  position: sticky;
  top: 85px;
}
.lesson-link {
  display: block;
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  padding: 13px;
  border-radius: 9px;
  cursor: pointer;
}
.lesson-link.active {
  background: var(--mint);
}
.lesson-link small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}
.lesson-stage,
.tool-stage {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(20px, 4vw, 42px);
  box-shadow: var(--shadow);
  min-height: 360px;
}
.lesson-stage.empty {
  display: grid;
  place-content: center;
  text-align: center;
}
.lesson-stage h1 {
  font-size: clamp(36px, 5vw, 58px);
}
.source-badge {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  background: var(--mint);
  padding: 7px 10px;
  border-radius: 9px;
  font-size: 11px;
  font-weight: 800;
}
.lesson-block {
  border-top: 1px solid var(--line);
  padding: 22px 0;
}
.lesson-block h3 {
  margin: 0 0 12px;
}
.fact-list {
  display: grid;
  gap: 9px;
  padding: 0;
  list-style: none;
}
.fact-list li {
  padding: 12px 14px;
  background: var(--bg);
  border-radius: 10px;
  line-height: 1.55;
}
.fact-list strong {
  color: #527032;
  text-decoration: underline;
  text-decoration-color: var(--lime);
  text-decoration-thickness: 4px;
}
.memory-box {
  background: var(--violet);
  padding: 18px;
  border-radius: 14px;
}
.memory-box span,
.trap-box span {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
.memory-box b {
  display: block;
  margin-top: 7px;
  font-size: 18px;
}
.trap-box {
  background: var(--peach);
  padding: 18px;
  border-radius: 14px;
  margin-top: 12px;
}
.practice-block {
  display: grid;
  gap: 12px;
}
.practice-block > h3 {
  margin-bottom: 0;
}
.example-card,
.scenario-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}
.example-card {
  background: color-mix(in srgb, var(--lime) 18%, var(--panel));
}
.scenario-card {
  background: color-mix(in srgb, var(--violet) 12%, var(--panel));
}
.example-card > span,
.scenario-card > span {
  display: block;
  margin-bottom: 8px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
.example-card p,
.scenario-card p {
  margin: 0;
  line-height: 1.65;
}
.scenario-card h4 {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.5;
}
.scenario-explanation {
  margin-top: 16px;
  border-left: 4px solid var(--lime);
  border-radius: 0 10px 10px 0;
  background: color-mix(in srgb, var(--lime) 10%, transparent);
  padding: 12px 14px;
}
.scenario-explanation b {
  display: block;
  margin-bottom: 5px;
}
.scenario-card details {
  margin-top: 14px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.scenario-card summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 800;
}
.scenario-card details div {
  margin-top: 12px;
  border-left: 4px solid var(--lime);
  padding: 4px 0 4px 12px;
}
.scenario-card details div p {
  margin-top: 5px;
}
.source-list {
  font-size: 12px;
  color: var(--muted);
}
.lesson-actions {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin-top: 22px;
}
.primary,
.secondary {
  border: 0;
  border-radius: 11px;
  padding: 12px 17px;
  font-weight: 800;
  cursor: pointer;
}
.primary {
  background: var(--ink);
  color: var(--panel);
}
.secondary {
  background: var(--lime);
  color: #102e2a;
}
.module-launches {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 12px 0;
}
.module-launches button {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 10px;
  padding: 9px 11px;
  cursor: pointer;
}
.mode-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.mode-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  text-align: left;
  cursor: pointer;
}
.mode-card > b {
  color: #66813d;
}
.mode-card h3 {
  margin: 20px 0 6px;
}
.mode-card p {
  color: var(--muted);
  margin: 0;
}
.tool-stage {
  margin-top: 18px;
}
.flashcard {
  min-height: 250px;
  display: grid;
  place-content: center;
  text-align: center;
  background: var(--ink);
  color: var(--panel);
  border-radius: 18px;
  padding: 30px;
  cursor: pointer;
}
.flashcard small {
  color: var(--lime);
}
.flashcard h2 {
  font-size: 32px;
}
.rating {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 15px;
}
.rating button {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 10px;
  padding: 10px;
}
.choice-grid {
  display: grid;
  gap: 9px;
}
.choice {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 11px;
  padding: 13px;
  text-align: left;
}
.choice.correct {
  background: #dff1d4;
}
.choice.wrong {
  background: #f8d3ca;
}
.quiz-top {
  display: flex;
  justify-content: space-between;
  font-weight: 800;
}
.mistake-list {
  display: grid;
  gap: 12px;
}
.mistake {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 6px solid var(--danger);
  border-radius: 14px;
  padding: 18px;
}
.mistake small {
  color: var(--muted);
}
.planner {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 18px;
}
.plan-form,
.plan-summary {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 17px;
  padding: 22px;
}
.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.check-grid label {
  background: var(--bg);
  padding: 10px;
  border-radius: 9px;
}
.plan-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.plan-summary strong {
  display: block;
  font: 700 28px Fraunces;
  margin-top: 12px;
}
.week-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
}
.week-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 17px;
}
.week-card > b {
  font-size: 12px;
  color: var(--muted);
}
.week-card ul {
  padding-left: 18px;
  color: var(--muted);
}
dialog {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  color: var(--ink);
  padding: 26px;
  width: min(430px, calc(100% - 30px));
  box-shadow: 0 30px 100px #0006;
}
dialog::backdrop {
  background: #07110fbb;
}
.dialog-close {
  float: right;
  border: 0;
  background: transparent;
  font-size: 25px;
}
.timer-display {
  font: 750 72px Fraunces;
  text-align: center;
  margin: 28px 0 5px;
}
.timer-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.timeline {
  display: grid;
  gap: 8px;
}
.timeline-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 13px;
  border-left: 4px solid var(--lime);
  padding: 10px;
}
.schema {
  display: flex;
  gap: 7px;
  overflow: auto;
  padding-bottom: 10px;
}
.stage-chip {
  min-width: 150px;
  background: var(--mint);
  padding: 14px;
  border-radius: 12px;
}
.match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
}
.match-item {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  cursor: grab;
}
.match-item.selected {
  outline: 3px solid var(--lime);
}
@media (max-width: 850px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }
  .topbar nav {
    position: fixed;
    z-index: 30;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--panel);
    border-top: 1px solid var(--line);
    padding: 8px;
    justify-content: space-around;
  }
  .nav {
    font-size: 11px;
    padding: 8px;
  }
  .brand small {
    display: none;
  }
  .hero {
    grid-template-columns: 1fr;
  }
  .hero-score {
    width: 130px;
  }
  .subject-grid,
  .planner {
    grid-template-columns: 1fr;
  }
  .study-layout {
    grid-template-columns: 1fr;
  }
  .lesson-nav {
    position: static;
    max-height: 260px;
  }
  .mode-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .week-grid {
    grid-template-columns: 1fr 1fr;
  }
  main {
    padding-bottom: 110px;
  }
  .integrity-note {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 520px) {
  main {
    width: min(100% - 20px, 1220px);
    padding-top: 18px;
  }
  .topbar {
    padding: 10px;
  }
  .header-tools {
    gap: 3px;
  }
  .timer-pill {
    padding: 8px;
  }
  .subject-grid,
  .week-grid,
  .check-grid {
    grid-template-columns: 1fr;
  }
  .page-head,
  .section-title {
    align-items: flex-start;
    flex-direction: column;
  }
  .page-head select {
    width: 100%;
  }
  .mode-grid {
    grid-template-columns: 1fr;
  }
  .lesson-stage,
  .tool-stage {
    padding: 18px;
  }
  .match-grid {
    grid-template-columns: 1fr;
  }
}