:root {
  color-scheme: dark;
  --bg: #2d2c66;
  --panel: #37357A;
  --panel-strong: #252454;
  --border: #5e57a6;
  --text: #f4f7fb;
  --muted: #c9c3eb;
  --accent: #664df0;
  --accent-2: #13dfb2;
  --danger: #ff9fb2;
  --success-bg: #173d36;
  --success-text: #13dfb2;
  --draft-bg: #433e87;
  --draft-text: #c7bbff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(19, 223, 178, 0.15), transparent 25%),
    radial-gradient(circle at bottom left, rgba(102, 77, 240, 0.22), transparent 28%),
    var(--bg);
  color: var(--text);
}

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

.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  background: rgba(45, 44, 102, 0.9);
}

.sidebar h1,
.content h2,
.content h3 {
  margin: 0;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav a,
.ghost-button,
.secondary-link,
.primary-link,
.danger-button,
.primary-button {
  border-radius: 14px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font: inherit;
}

.nav a.active,
.nav a:hover,
.secondary-link:hover,
.ghost-button:hover {
  background: var(--panel);
}

.primary-button,
.primary-link {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 700;
}

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

.legacy-brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  object-fit: cover;
  box-shadow: 0 16px 28px rgba(20, 20, 50, 0.24);
}

.auth-brand-lockup {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

.auth-brand-logo {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 16px 28px rgba(20, 20, 50, 0.28);
}

.danger-button {
  border-color: rgba(255, 125, 125, 0.35);
  color: var(--danger);
}

.content {
  padding: 32px;
}

.content--centered {
  display: grid;
  place-items: center;
}

.auth-panel {
  max-width: 520px;
  width: 100%;
}

.panel,
.metric-card,
.list-card,
.lesson-row {
  background: rgba(18, 32, 51, 0.96);
  border: 1px solid var(--border);
  border-radius: 24px;
}

.panel,
.list-card {
  padding: 24px;
}

.stack {
  display: grid;
  gap: 16px;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.metric-card {
  padding: 20px;
  display: grid;
  gap: 6px;
}

.metric-card span,
.muted,
.eyebrow {
  color: var(--muted);
}

.metric-card strong {
  font-size: 32px;
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  font-weight: 700;
}

.field {
  display: grid;
  gap: 8px;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel-strong);
  border-radius: 14px;
  padding: 12px 14px;
  color: var(--text);
  font: inherit;
}

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

.notice,
.alert {
  border-radius: 16px;
  padding: 14px 16px;
  background: rgba(124, 226, 255, 0.1);
  border: 1px solid rgba(124, 226, 255, 0.18);
}

.alert {
  background: rgba(255, 125, 125, 0.12);
  border-color: rgba(255, 125, 125, 0.2);
}

.list-card {
  display: grid;
  gap: 16px;
}

.lesson-row {
  display: grid;
  grid-template-columns: 12px 1fr auto;
  gap: 18px;
  padding: 18px;
  align-items: center;
}

.lesson-swatch {
  border-radius: 999px;
  min-height: 100%;
}

.lesson-main {
  display: grid;
  gap: 8px;
}

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

.pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.pill--published {
  background: var(--success-bg);
  color: var(--success-text);
}

.pill--draft {
  background: var(--draft-bg);
  color: var(--draft-text);
}

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.editor-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
}

.editor-grid--full {
  grid-column: 1 / -1;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.question-block {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px;
  display: grid;
  gap: 16px;
  background: var(--panel-strong);
}

@media (max-width: 960px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .metrics,
  .editor-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

  .lesson-row {
    grid-template-columns: 1fr;
  }
}