:root {
  --bg: #edf2f0;
  --surface: #fbfcfa;
  --ink: #13202f;
  --muted: #627184;
  --line: #d8e0de;
  --teal: #0f766e;
  --teal-2: #14b8a6;
  --blue: #2563eb;
  --orange: #f97316;
  --rose: #be123c;
  --amber: #d97706;
  --shadow: 0 22px 60px rgba(30, 45, 62, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(20, 184, 166, 0.18), transparent 34rem),
    linear-gradient(135deg, #f7faf7 0%, var(--bg) 100%);
  color: var(--ink);
  min-height: 100vh;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

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

.sidebar {
  background: #10202a;
  color: #f8fbfa;
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--teal-2), #f59e0b);
  display: grid;
  place-items: center;
  font-weight: 900;
  letter-spacing: 0;
}

.brand h1,
.brand p,
.topbar h2,
.panel h3,
.hero-panel h3 {
  margin: 0;
}

.brand h1 {
  font-size: 18px;
}

.brand p,
.eyeline,
.panel-label {
  color: rgba(255, 255, 255, 0.66);
  margin: 4px 0 0;
  font-size: 13px;
}

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

.nav-item {
  border: 1px solid transparent;
  background: transparent;
  color: rgba(255, 255, 255, 0.78);
  text-align: left;
  padding: 13px 14px;
  border-radius: 8px;
}

.nav-item.active,
.nav-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.exam-card {
  margin-top: auto;
  padding: 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.exam-card label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

.exam-card input {
  width: 100%;
  border: 0;
  border-radius: 6px;
  padding: 10px;
  color: var(--ink);
}

.days-left {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 16px;
}

.days-left strong {
  font-size: 36px;
}

main {
  padding: 30px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-bottom: 26px;
}

.topbar h2 {
  font-size: 34px;
}

.eyeline,
.panel-label {
  color: var(--teal);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.top-actions,
.hint-actions,
.mark-row,
.filter-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button,
.ghost-button,
.text-button,
.filter-button,
.result-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 40px;
  padding: 0 14px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
}

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

.secondary-button {
  background: #eef8f5;
  color: var(--teal);
  border-color: #bfe5df;
}

.ghost-button {
  background: rgba(255, 255, 255, 0.68);
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--teal);
  padding: 0;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 18px;
}

.hero-panel,
.panel,
.practice-card {
  background: rgba(251, 252, 250, 0.88);
  border: 1px solid rgba(216, 224, 222, 0.9);
  box-shadow: var(--shadow);
  border-radius: 8px;
}

.hero-panel {
  grid-column: span 2;
  min-height: 220px;
  padding: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  align-items: center;
  gap: 18px;
  overflow: hidden;
}

.hero-panel h3 {
  font-size: 38px;
  line-height: 1.06;
  max-width: 620px;
}

.hero-panel p:last-child {
  color: var(--muted);
  font-size: 17px;
  max-width: 650px;
  line-height: 1.6;
}

.hero-visual {
  background: #e8f5f1;
  border: 1px solid #cde4df;
  border-radius: 8px;
  padding: 18px;
}

.hero-visual svg {
  width: 100%;
  height: auto;
  display: block;
}

.metric-strip {
  grid-column: span 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.metric-strip article {
  background: #13202f;
  color: white;
  border-radius: 8px;
  padding: 18px;
}

.metric-strip span {
  display: block;
  color: rgba(255, 255, 255, 0.68);
  font-size: 13px;
  margin-bottom: 8px;
}

.metric-strip strong {
  font-size: 30px;
}

.panel,
.practice-card {
  padding: 22px;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-head h3 {
  font-size: 22px;
}

.priority-list,
.task-list,
.mistake-log {
  display: grid;
  gap: 12px;
}

.priority-item,
.task-item,
.mistake-item,
.formula-card,
.topic-card {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 14px;
}

.priority-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}

.priority-item strong,
.task-item strong,
.topic-card strong {
  display: block;
  margin-bottom: 4px;
}

.priority-item p,
.task-item p,
.topic-card p,
.mistake-item p,
.formula-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.score-badge,
.topic-pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  padding: 0 10px;
  font-size: 13px;
  font-weight: 800;
  color: #0f513f;
  background: #dff7ed;
}

.page-head {
  align-items: center;
}

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

.topic-groups {
  display: grid;
  gap: 18px;
}

.topic-group {
  background: rgba(251, 252, 250, 0.9);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.topic-group h3 {
  margin: 0 0 14px;
}

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

.topic-card {
  display: grid;
  gap: 12px;
}

.topic-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.confidence-row {
  display: grid;
  grid-template-columns: 80px 1fr 42px;
  gap: 10px;
  align-items: center;
}

.confidence-row input {
  width: 100%;
  accent-color: var(--teal);
}

.complete-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

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

.question-prompt {
  font-size: 23px;
  line-height: 1.5;
  margin: 18px 0;
}

.answer-box {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.answer-box label {
  font-weight: 800;
}

textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  min-height: 140px;
  background: #fff;
  color: var(--ink);
}

.support-panel {
  margin-top: 14px;
  background: #fff9ec;
  border: 1px solid #f1d69e;
  border-radius: 8px;
  padding: 14px;
  color: #603c08;
  line-height: 1.55;
}

.mark-row {
  margin-top: 18px;
}

.result-button.correct {
  border-color: #9bd7ad;
  background: #ecfdf0;
  color: #166534;
}

.result-button.partial {
  border-color: #f2cf88;
  background: #fffbeb;
  color: #92400e;
}

.result-button.missed {
  border-color: #f2a8b8;
  background: #fff1f2;
  color: #9f1239;
}

.practice-side p {
  color: var(--muted);
  line-height: 1.5;
}

.mini-chart {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.bar-row {
  display: grid;
  grid-template-columns: 96px 1fr 38px;
  gap: 8px;
  align-items: center;
  font-size: 13px;
}

.bar-track {
  height: 9px;
  border-radius: 999px;
  background: #dbe5e2;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--rose), var(--orange), var(--teal));
}

.review-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 18px;
}

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

.formula-card strong {
  display: block;
  margin-bottom: 8px;
}

.formula-card code {
  display: block;
  margin-top: 10px;
  padding: 10px;
  border-radius: 6px;
  background: #eef3f2;
  white-space: pre-wrap;
  line-height: 1.4;
}

.mistake-item button {
  margin-top: 10px;
}

@media (max-width: 980px) {
  .app-shell,
  .dashboard-grid,
  .practice-layout,
  .review-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .hero-panel,
  .metric-strip {
    grid-column: auto;
  }

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

  .metric-strip,
  .topic-list,
  .formula-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  main,
  .sidebar {
    padding: 18px;
  }

  .topbar,
  .section-head {
    flex-direction: column;
    align-items: stretch;
  }

  .topbar h2,
  .hero-panel h3 {
    font-size: 28px;
  }

  .metric-strip,
  .topic-list,
  .formula-grid {
    grid-template-columns: 1fr;
  }

  .confidence-row,
  .bar-row {
    grid-template-columns: 1fr;
  }
}