:root {
  color-scheme: light;
  --bg: #f6f7f8;
  --panel: #ffffff;
  --panel-2: #eef2f3;
  --text: #1d2527;
  --muted: #617073;
  --border: #dce3e5;
  --accent: #0f766e;
  --accent-2: #155e75;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --ok: #237a3b;
  --ok-bg: #ecf8ef;
  --warn: #a15c00;
  --warn-bg: #fff6e5;
  --shadow: 0 12px 32px rgba(15, 35, 39, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
}

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

button {
  cursor: pointer;
}

#app {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 18px 14px 42px;
}

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

.eyebrow {
  margin: 0 0 2px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(1.7rem, 9vw, 2.6rem);
  line-height: 1;
}

h2 {
  font-size: 1.35rem;
  line-height: 1.2;
}

h3 {
  font-size: 1.02rem;
}

.status,
.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 10px;
  color: var(--muted);
  background: var(--panel);
  font-size: 0.82rem;
  white-space: nowrap;
}

.tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 4px;
  margin: 0 -4px 18px;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tabs button {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 8px;
  min-height: 38px;
  white-space: nowrap;
}

.tabs button.active {
  background: var(--panel);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow);
}

.view-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 14px;
}

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

.grid.cols-2,
.grid.cols-3,
.grid.cols-4 {
  grid-template-columns: 1fr;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 14px;
}

.metric {
  min-height: 94px;
}

.metric .label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
}

.metric .value {
  font-size: 1.7rem;
  font-weight: 760;
  line-height: 1.15;
  margin-top: 5px;
}

.metric .sub {
  color: var(--muted);
  font-size: 0.86rem;
  margin-top: 4px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  min-height: 40px;
  padding: 8px 12px;
  font-weight: 680;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

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

.btn.danger {
  background: var(--danger-bg);
  border-color: #ffd1cc;
  color: var(--danger);
}

.btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.question {
  font-size: 1.08rem;
  line-height: 1.62;
  font-weight: 610;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.option-list {
  display: grid;
  gap: 9px;
  margin-top: 12px;
}

.option {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  padding: 12px;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 9px;
  text-align: left;
  min-height: 54px;
}

.option:hover,
.option.selected {
  border-color: var(--accent);
}

.letter {
  display: inline-flex;
  width: 30px;
  height: 30px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--panel-2);
  font-weight: 760;
}

.progressbar {
  width: 100%;
  height: 9px;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
}

.progressbar > span {
  display: block;
  height: 100%;
  width: var(--pct, 0%);
  background: var(--accent);
}

.timer {
  font-variant-numeric: tabular-nums;
  font-size: 1.25rem;
  font-weight: 760;
  color: var(--accent-2);
}

.timer.low {
  color: var(--danger);
}

.feedback.ok {
  border-color: #b9e7c6;
  background: var(--ok-bg);
}

.feedback.err {
  border-color: #ffd1cc;
  background: var(--danger-bg);
}

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

.notice {
  background: var(--warn-bg);
  border: 1px solid #f5d08a;
  color: #5b3900;
  border-radius: 8px;
  padding: 11px 12px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

th,
td {
  padding: 10px 11px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

tr:last-child td {
  border-bottom: 0;
}

.filters {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr;
}

.field {
  display: grid;
  gap: 5px;
}

.field label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 8px 10px;
}

.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.exam-shell {
  display: grid;
  gap: 12px;
}

.exam-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.exam-dot {
  width: 38px;
  height: 34px;
  padding: 0;
}

.exam-dot.answered {
  border-color: var(--accent);
  background: #e8f7f5;
}

.lesson-row {
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--border);
  padding: 12px 0;
}

.lesson-row:first-child {
  border-top: 0;
}

a {
  color: var(--accent-2);
  font-weight: 700;
}

.empty {
  padding: 22px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

@media (min-width: 720px) {
  #app {
    padding: 28px 22px 56px;
  }

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

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

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

  .filters {
    grid-template-columns: 1.3fr 1fr 1fr auto;
    align-items: end;
  }

  .split {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  }
}