:root {
  --ink: #1f2937;
  --muted: #64748b;
  --line: #d8dee9;
  --panel: #ffffff;
  --page: #f4f7f9;
  --green: #0f8a61;
  --blue: #2563eb;
  --red: #b42318;
  --amber: #b7791f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--page);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: var(--blue);
  text-decoration: none;
}

button,
.button {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 14px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.secondary {
  color: var(--ink);
  background: white;
  border-color: var(--line);
}

.danger {
  color: white;
  background: var(--red);
}

.topbar {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: white;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  font-weight: 800;
}

.topbar nav {
  display: flex;
  gap: 18px;
}

.page {
  max-width: 1220px;
  margin: 0 auto;
  padding: 28px;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  margin-bottom: 24px;
}

.toolbar.compact {
  margin-bottom: 18px;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 4px;
  font-size: 32px;
}

h2 {
  font-size: 18px;
}

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

.actions,
.link-row,
.card-row,
.status-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lesson-grid,
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.compact-grid {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.metric-card strong,
.metric-card span {
  display: block;
}

.lesson-card,
.metric-card,
.panel,
.caption-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

dl {
  display: grid;
  grid-template-columns: minmax(110px, 0.45fr) 1fr;
  gap: 8px 12px;
  margin: 0 0 14px;
}

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

dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.status,
.mode {
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 800;
  background: #eef2f7;
}

.status.running {
  color: white;
  background: var(--green);
}

.status.stopped {
  color: white;
  background: var(--red);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.log {
  min-height: 260px;
  max-height: 420px;
  overflow: auto;
  background: #101828;
  color: #d1fadf;
  border-radius: 8px;
  padding: 14px;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
}

.student-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(320px, 0.8fr);
  gap: 18px;
  align-items: start;
}

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

.video-area {
  min-height: 520px;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(17, 24, 39, 0.9), rgba(12, 74, 110, 0.85)),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 44px);
  color: white;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.video-topline,
.latency-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
}

.video-center {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  text-align: left;
}

.play-mark {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  position: relative;
}

.play-mark::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 16px;
  border-left: 18px solid white;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
}

.caption-overlay {
  margin: 16px;
  padding: 14px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.62);
  white-space: pre-line;
  line-height: 1.45;
}

.meeting-sdk-element {
  min-height: 520px;
  width: 100%;
  background: #111827;
}

.caption-below {
  margin: 0;
}

.caption-below pre {
  margin: 0;
  white-space: pre-wrap;
  font: inherit;
  line-height: 1.45;
}

.latency-strip {
  background: white;
  border: 1px solid var(--line);
  border-radius: 8px;
}

meter {
  width: 100%;
  min-width: 120px;
}

.caption-panel {
  position: sticky;
  top: 84px;
}

.field {
  display: grid;
  gap: 6px;
  margin: 16px 0;
}

select,
input[type="text"],
input[type="file"] {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: white;
}

input[type="file"] {
  padding: 8px 10px;
}

.partial-box {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  margin: 16px 0;
}

.zoom-note {
  display: grid;
  gap: 8px;
  margin: 14px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.rtms-panel {
  margin-top: 16px;
}

.caption-list {
  display: grid;
  gap: 10px;
}

.caption-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fbfdff;
}

.caption-item pre {
  margin: 8px 0 0;
  white-space: pre-wrap;
  font: inherit;
}

.compare-checks {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.compare-checks label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-right: 12px;
}

.table-wrap {
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.results-table th,
.results-table td {
  border-bottom: 1px solid var(--line);
  padding: 8px;
  text-align: left;
  vertical-align: top;
  min-width: 90px;
}

.ok {
  color: var(--green);
}

.late {
  color: var(--amber);
}

.empty,
.toast {
  background: white;
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 24px;
  color: var(--muted);
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  color: var(--ink);
  border-style: solid;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.14);
}

@media (max-width: 820px) {
  .toolbar,
  .split,
  .student-layout {
    grid-template-columns: 1fr;
    display: grid;
  }

  .topbar {
    padding: 0 16px;
  }

  .page {
    padding: 18px;
  }

  .video-area {
    min-height: 420px;
  }

  .caption-panel {
    position: static;
  }
}