:root {
  color-scheme: light;
  --bg: #fbf7ef;
  --surface: #ffffff;
  --surface-2: #f1ece3;
  --text: #251f2b;
  --muted: #6d6573;
  --line: #ded7ca;
  --primary: #c2187a;
  --primary-2: #801356;
  --accent: #d9b51c;
  --green: #23866f;
  --blue: #2d669f;
  --danger: #b63c35;
  --shadow: 0 20px 50px rgba(54, 41, 25, 0.12);
  --radius: 8px;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #17131a;
  --surface: #211b26;
  --surface-2: #2a2230;
  --text: #faf4ff;
  --muted: #b9aebf;
  --line: #3e3346;
  --primary: #ff4fab;
  --primary-2: #ff99cc;
  --accent: #f2cf3c;
  --green: #55c7a9;
  --blue: #73a8e8;
  --danger: #ff8179;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns 0.22s ease;
}

.app-shell.sidebar-collapsed {
  grid-template-columns: 86px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 22px;
  background: var(--surface);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 24px;
  z-index: 20;
}

.collapse-button {
  position: absolute;
  top: 22px;
  right: -15px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow);
  font-size: 1.4rem;
  line-height: 1;
}

.sidebar-collapsed .collapse-button span {
  transform: rotate(180deg);
}

.brand {
  display: grid;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.brand img {
  width: min(210px, 100%);
  height: auto;
}

.sidebar-collapsed .brand {
  justify-items: center;
}

.sidebar-collapsed .brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  object-position: left center;
}

.sidebar-collapsed .brand span,
.sidebar-collapsed .nav-text,
.sidebar-collapsed .sidebar-card .eyebrow,
.sidebar-collapsed .sidebar-card strong,
.sidebar-collapsed .sidebar-card small {
  display: none;
}

.nav-list {
  display: grid;
  gap: 8px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--muted);
  text-decoration: none;
  transition: 0.2s ease;
}

.sidebar-collapsed .nav-link {
  justify-content: center;
  padding: 10px;
}

.nav-icon {
  min-width: 22px;
  text-align: center;
}

.nav-link:hover,
.nav-link.active {
  background: var(--surface-2);
  color: var(--text);
}

.sidebar-card,
.panel,
.lesson-panel,
.module-list,
.reading-detail,
.exam-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.sidebar-card {
  margin-top: auto;
  padding: 16px;
}

.sidebar-collapsed .sidebar-card {
  padding: 10px;
}

.mini-progress {
  height: 9px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
  margin: 12px 0 8px;
}

.mini-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.4s ease;
}

.main {
  min-width: 0;
  overflow-x: hidden;
  padding: 24px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0 22px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
}

.topbar h1,
.hero h2,
.section-heading h2,
.panel h2,
.lesson-panel h2,
.reading-detail h2 {
  margin: 0;
  letter-spacing: 0;
}

.topbar h1 {
  font-size: clamp(1.35rem, 2vw, 2rem);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--primary);
  font-size: 0.77rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topbar-actions,
.hero-actions,
.button-row,
.filter-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-row select,
.filter-row input {
  width: min(280px, 100%);
}

.menu-button {
  display: none;
}

.icon-button,
.primary-button,
.secondary-button,
.ghost-button {
  border: 0;
  border-radius: var(--radius);
  min-height: 42px;
  transition:
    transform 0.18s ease,
    background 0.18s ease,
    color 0.18s ease;
}

.icon-button {
  width: 42px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
}

.primary-button,
.secondary-button,
.ghost-button {
  padding: 0 16px;
  font-weight: 800;
}

.primary-button {
  background: var(--primary);
  color: white;
}

.secondary-button {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--line);
}

.ghost-button {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--line);
}

button:hover {
  transform: translateY(-1px);
}

.view {
  display: none;
  animation: rise 0.28s ease both;
}

.active-view {
  display: block;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  min-height: 380px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(220px, 0.65fr);
  align-items: center;
  gap: 24px;
  padding: clamp(28px, 5vw, 56px);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, color-mix(in srgb, var(--primary) 16%, transparent), transparent 54%),
    linear-gradient(35deg, color-mix(in srgb, var(--accent) 22%, transparent), transparent 48%),
    var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero > div,
.topbar > div,
.lesson-block,
.panel,
.reading-detail {
  min-width: 0;
}

.hero h2 {
  font-size: clamp(2.05rem, 5vw, 4.05rem);
  line-height: 1.02;
  max-width: 820px;
  overflow-wrap: anywhere;
}

.hero p:not(.eyebrow) {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.progress-orbit {
  aspect-ratio: 1;
  min-width: 220px;
  display: grid;
  place-items: center;
  text-align: center;
  border: 14px solid color-mix(in srgb, var(--primary) 24%, var(--surface-2));
  border-top-color: var(--accent);
  border-radius: 50%;
}

.progress-orbit strong {
  display: block;
  font-size: clamp(2.4rem, 6vw, 4rem);
}

.progress-orbit span {
  color: var(--muted);
  font-weight: 700;
}

.metric-grid,
.recommendation-grid,
.badge-grid,
.tools-grid,
.writing-grid {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.metric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.metric-card,
.recommendation-card,
.badge-card,
.reading-card,
.question-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.metric-card strong {
  display: block;
  font-size: 1.8rem;
}

.metric-card span,
.recommendation-card p,
.badge-card p,
.reading-card p,
.question-card p,
.lesson-panel p,
.lesson-panel li,
.reading-detail p,
.feedback-panel p {
  color: var(--muted);
  line-height: 1.65;
}

.panel {
  padding: 20px;
  margin-top: 16px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin: 8px 0 16px;
}

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

.badge-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.badge-card.locked {
  opacity: 0.54;
}

.course-layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 18px;
}

.module-list {
  padding: 12px;
  align-self: start;
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  overflow: auto;
}

.module-button {
  width: 100%;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  text-align: left;
  padding: 12px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
}

.module-button.active {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 10%, var(--surface));
}

.module-number {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: white;
  background: var(--primary);
  font-weight: 900;
}

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

.lesson-panel {
  padding: clamp(18px, 3vw, 34px);
}

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

.lesson-block {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.lesson-block.full {
  grid-column: 1 / -1;
}

.checklist {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.checklist label {
  display: flex;
  align-items: start;
  gap: 10px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--surface);
  color: var(--text);
}

label {
  display: block;
  margin: 14px 0 8px;
  font-weight: 800;
}

textarea {
  resize: vertical;
}

.writing-grid {
  grid-template-columns: minmax(300px, 0.75fr) minmax(0, 1.25fr);
}

.reading-layout {
  display: grid;
}

.reading-carousel-wrap {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: stretch;
  gap: 10px;
  margin-bottom: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 82%, var(--surface-2));
}

.reading-list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 300px);
  gap: 12px;
  overflow: auto;
  padding: 4px 2px 12px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.carousel-button {
  align-self: center;
  border-radius: 50%;
  font-size: 1.5rem;
}

.reading-card {
  text-align: left;
  width: 100%;
  min-height: 132px;
  color: var(--text);
  cursor: pointer;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: none;
  transition:
    border-color 0.18s ease,
    transform 0.18s ease,
    background 0.18s ease;
}

.reading-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--primary) 40%, var(--line));
}

.reading-card.active {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 8%, var(--surface));
}

.reading-detail {
  padding: 24px;
  align-self: start;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.question-card {
  margin-top: 12px;
}

.option {
  display: block;
  width: 100%;
  margin: 8px 0;
  padding: 12px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
}

.option.correct {
  border-color: var(--green);
  background: color-mix(in srgb, var(--green) 12%, var(--surface));
}

.option.incorrect {
  border-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
}

.exam-panel {
  padding: 20px;
}

.tools-grid {
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  align-items: stretch;
}

.tool-hero {
  grid-row: span 2;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, color-mix(in srgb, var(--primary) 16%, transparent), transparent 48%),
    linear-gradient(30deg, color-mix(in srgb, var(--accent) 18%, transparent), transparent 60%),
    var(--surface);
  box-shadow: var(--shadow);
}

.tool-hero h2 {
  margin: 0 0 18px;
  font-size: clamp(1.8rem, 4vw, 3.4rem);
  line-height: 1.05;
}

.glossary-panel,
.flashcard-panel {
  margin-top: 0;
}

.glossary-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  max-height: 310px;
  overflow: auto;
}

.glossary-item {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.flashcard {
  min-height: 190px;
  display: grid;
  place-items: center;
  padding: 22px;
  margin: 12px 0;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface-2);
  text-align: center;
  font-weight: 800;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 40;
  max-width: min(420px, calc(100vw - 40px));
  padding: 14px 16px;
  border-radius: var(--radius);
  background: var(--text);
  color: var(--bg);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: 0.22s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.score-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.map {
  display: grid;
  gap: 12px;
}

.map div {
  display: grid;
  gap: 4px;
  padding: 16px;
  border-left: 4px solid var(--primary);
  background: var(--surface);
  border-radius: var(--radius);
}

.map span {
  color: var(--muted);
}

@media (max-width: 1120px) {
  .metric-grid,
  .recommendation-grid,
  .badge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .course-layout,
  .writing-grid {
    grid-template-columns: 1fr;
  }

  .module-list {
    position: static;
    max-height: none;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 780px) {
  .app-shell {
    display: block;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(320px, 86vw);
    transform: translateX(-105%);
    transition: transform 0.22s ease;
  }

  .collapse-button {
    display: none;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main {
    width: 100%;
    max-width: 100vw;
    padding: 16px;
  }

  .menu-button {
    display: inline-grid;
    place-items: center;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .progress-orbit {
    width: min(250px, 80vw);
    justify-self: center;
  }

  .metric-grid,
  .recommendation-grid,
  .badge-grid,
  .tools-grid,
  .lesson-grid {
    grid-template-columns: 1fr;
  }

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

  .topbar {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    justify-content: stretch;
  }

  .topbar > div:not(.topbar-actions) {
    grid-column: 1 / -1;
  }

  .topbar-actions {
    grid-column: 1 / -1;
  }

  .hero {
    padding: 28px;
    overflow: hidden;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .hero-actions button {
    width: 100%;
  }
}