deployment/activity_web/backend/static/styles.css

:root {
  color-scheme: light;
  --bg: #f6f0e8;
  --bg-accent: #e8f1ff;
  --panel: rgba(255, 255, 255, 0.82);
  --text: #1f232b;
  --muted: #5d6675;
  --border: rgba(31, 35, 43, 0.12);
  --accent: #0d6efd;
  --accent-strong: #0b5ed7;
  --shadow: 0 22px 60px rgba(31, 35, 43, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(13, 110, 253, 0.18), transparent 32%),
    radial-gradient(circle at top right, rgba(16, 124, 65, 0.14), transparent 28%),
    linear-gradient(135deg, var(--bg), var(--bg-accent));
}

.shell {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  max-width: 720px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  color: var(--accent-strong);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.6rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 60ch;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 16px 0 0;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.tabs-shell {
  display: grid;
  gap: 16px;
}

.tabs-bar {
  display: inline-flex;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  width: fit-content;
}

.tab-button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  box-shadow: none;
}

.tab-button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: white;
}

.tab-panel.hidden {
  display: none;
}

.attendance-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.attendance-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
}

.attendance-card-wide {
  grid-column: 1 / -1;
}

.attendance-card-header h2 {
  margin: 0;
  font-size: 1.35rem;
}

.attendance-card-header p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.stack-form {
  display: grid;
  gap: 14px;
}

.field-label {
  display: grid;
  gap: 8px;
  font-weight: 700;
  color: var(--text);
}

.field-label input {
  width: 100%;
  border: 1px solid rgba(31, 35, 43, 0.16);
  border-radius: 16px;
  padding: 14px 16px;
  font: inherit;
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
}

.file-drop-compact {
  min-height: 74px;
}

.attendance-result,
.result-list,
.roster-list {
  display: grid;
  gap: 10px;
}

.result-summary {
  font-weight: 800;
}

.result-detail,
.result-item,
.roster-item {
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(31, 35, 43, 0.08);
  background: rgba(255, 255, 255, 0.84);
}

.result-item,
.roster-item {
  display: grid;
  gap: 4px;
}

.roster-item {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.roster-item-main {
  display: grid;
  gap: 4px;
}

.delete-student-button {
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(220, 53, 69, 0.12);
  color: #b42318;
  box-shadow: none;
}

.delete-student-button:hover {
  background: rgba(220, 53, 69, 0.18);
}

.result-item span,
.roster-item span,
.muted {
  color: var(--muted);
}

.marked-photo-preview {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: 18px;
  border: 1px solid rgba(31, 35, 43, 0.1);
  background: #000;
  cursor: zoom-in;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox.hidden { display: none; }

.lightbox-img {
  max-width: 95vw;
  max-height: 95vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
}

.lightbox-close {
  position: fixed;
  top: 18px;
  right: 24px;
  background: none;
  border: none;
  color: #fff;
  font-size: 2.2rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.8;
  z-index: 10000;
}
.lightbox-close:hover { opacity: 1; }

.upload-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
}

.file-drop {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 84px;
  padding: 18px 20px;
  border: 1.5px dashed rgba(31, 35, 43, 0.2);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-weight: 600;
  cursor: pointer;
}

.file-drop input {
  display: none;
}

button {
  border: 0;
  border-radius: 16px;
  padding: 16px 22px;
  font: inherit;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(13, 110, 253, 0.24);
}

button:disabled {
  opacity: 0.7;
  cursor: wait;
}

.status {
  margin-top: 16px;
  color: var(--muted);
  font-weight: 600;
}

.results {
  margin-top: 22px;
  display: grid;
  gap: 18px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.metric {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border);
}

.metric .label {
  display: block;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 8px;
}

.metric .value {
  font-size: 1.2rem;
  font-weight: 800;
}

.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.downloads a {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(13, 110, 253, 0.08);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
}

.student-groups {
  display: grid;
  gap: 16px;
}

.clip-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  padding: 16px 16px 0;
}

.clip-card {
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid rgba(31, 35, 43, 0.1);
  background: rgba(255, 255, 255, 0.88);
}

.clip-player {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.clip-card-body {
  padding: 12px 14px 14px;
}

.clip-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.clip-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(13, 110, 253, 0.08);
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.clip-badge-phone {
  background: rgba(220, 53, 69, 0.1);
  color: #b42318;
}

.clip-badge-cnn {
  background: rgba(16, 124, 65, 0.1);
  color: var(--success);
}

.clip-summary,
.clip-detail {
  margin: 0;
  line-height: 1.45;
}

.clip-summary {
  font-weight: 800;
}

.clip-detail {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.92rem;
}

.clip-link {
  display: inline-flex;
  margin-top: 12px;
  font-weight: 700;
  color: var(--accent-strong);
  text-decoration: none;
}

.student-card {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  overflow: hidden;
}

.student-card-header {
  padding: 16px 18px 10px;
  border-bottom: 1px solid rgba(31, 35, 43, 0.08);
}

.student-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
}

.student-meta {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.empty-state {
  padding: 18px 20px;
  border-radius: 18px;
  border: 1px dashed var(--border);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.7);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(31, 35, 43, 0.08);
}

th {
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

tbody tr:hover {
  background: rgba(13, 110, 253, 0.04);
}

.hidden {
  display: none;
}

.error {
  color: #b42318;
}

@media (max-width: 720px) {
  .shell {
    width: min(100% - 20px, 1100px);
    padding-top: 18px;
  }

  .panel {
    padding: 18px;
    border-radius: 22px;
  }

  .upload-form {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }

  .tabs-bar {
    width: 100%;
    flex-direction: column;
    border-radius: 24px;
  }

  .tab-button {
    width: 100%;
  }

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

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

/* ── Cognitive tab ─────────────────────────────────────────────────────────── */

.cognitive-charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 24px 0;
}

.cognitive-chart-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}

.chart-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  margin: 0 0 14px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cognitive-table-wrap {
  overflow-x: auto;
  margin-top: 24px;
}

.cognitive-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.cognitive-table th {
  background: var(--bg-accent);
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

.cognitive-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.cognitive-table tr:last-child td {
  border-bottom: none;
}

.cognitive-table tr:hover td {
  background: var(--bg-accent);
}

.attn-badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
}

.attn-high   { background: #d4edda; color: #1a5e2a; }
.attn-medium { background: #fff3cd; color: #7a5000; }
.attn-low    { background: #f8d7da; color: #721c24; }

.attend-present { color: #1a5e2a; font-weight: 600; }
.attend-absent  { color: #721c24; font-weight: 600; }

.cog-clip-thumb {
  width: 160px;
  height: 90px;
  object-fit: cover;
  border-radius: 8px;
  cursor: pointer;
}

.conc-bar-bg {
  background: var(--border);
  border-radius: 4px;
  height: 8px;
  width: 100px;
  display: inline-block;
  vertical-align: middle;
  overflow: hidden;
}

.conc-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, #4caf50, #2196f3);
}

/* ── Classroom tab ─────────────────────────────────────────────────────────── */

.cls-attention-bar {
  margin: 1.5rem 0 1rem;
}

.cls-bar-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cls-bar {
  display: flex;
  height: 36px;
  border-radius: 6px;
  overflow: hidden;
  gap: 2px;
}

.cls-bar-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  transition: flex 0.3s;
  overflow: hidden;
}

.cls-bar-seg span {
  font-size: 0.7rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  text-shadow: 0 1px 2px rgba(0,0,0,0.4);
  padding: 0 6px;
}

.cls-students {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.cls-student-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
}

.cls-student-summary {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.1rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
  flex-wrap: wrap;
  background: var(--bg);
}

.cls-student-summary::-webkit-details-marker { display: none; }

.cls-student-id {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  min-width: 90px;
}

.cls-student-dominant {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--border);
  padding: 2px 8px;
  border-radius: 20px;
}

.cls-student-attn {
  font-size: 0.85rem;
  font-weight: 700;
}

.cls-student-windows {
  font-size: 0.78rem;
  color: var(--muted);
  margin-left: auto;
}

.cls-mini-bar {
  display: flex;
  height: 10px;
  border-radius: 3px;
  overflow: hidden;
  width: 140px;
  flex-shrink: 0;
  gap: 1px;
}

.cls-mini-seg {
  min-width: 3px;
}

.cls-timeline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 1.1rem;
  border-top: 1px solid var(--border);
}

.cls-win {
  border: 2px solid #ccc;
  border-radius: 8px;
  overflow: hidden;
  width: 180px;
  flex-shrink: 0;
  background: var(--bg);
}

.cls-win-header {
  padding: 5px 8px;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.cls-win-time {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.cls-win-action {
  font-size: 0.8rem;
  font-weight: 700;
}

.cls-win-meta {
  font-size: 0.68rem;
  color: var(--muted);
}

.cls-win-clip {
  width: 100%;
  display: block;
  background: #000;
}

.cls-win-no-clip {
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--muted);
  background: var(--border);
}

.tab-btn {
  padding: 4px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--muted);
}
.tab-btn.tab-active {
  background: var(--accent, #3b82f6);
  color: #fff;
  border-color: var(--accent, #3b82f6);
}