/* ═══════════════════════════════════════════════════════════════════════════
   app.css — Presentation Practice
   University of Cambridge ADTIS
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── CSS custom properties (University of Cambridge palette) ────────────── */
:root {
  --cambridge-blue:  #003B71;   /* primary — header, buttons, footer        */
  --cambridge-mid:   #1B5EA7;   /* hover / active state                     */
  --cambridge-light: #6CACE4;   /* accent — drop-zone border, focus rings   */
  --cambridge-pale:  #E8F1FB;   /* very light tint — hover backgrounds      */
  --bg:              #F5F7FA;   /* page background                          */
  --surface:         #FFFFFF;   /* card / input background                  */
  --text:            #1A1A1A;   /* primary body text                        */
  --text-muted:      #5A6472;   /* secondary / hint text                    */
  --error:           #C0392B;   /* validation and server errors             */
  --border:          #C8D8EB;   /* input borders, spinner track             */
  --radius:          6px;
  --shadow:          0 2px 10px rgba(0, 59, 113, 0.10);
  --transition:      0.18s ease;
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Ensure the HTML hidden attribute always wins, even when an element has an
   explicit display value set by a CSS class (e.g. .modal-overlay{display:flex}). */
[hidden] { display: none !important; }

/* ── Skip link (keyboard navigation) ───────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--cambridge-blue);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 var(--radius) var(--radius);
  text-decoration: none;
  z-index: 9999;
  transition: top 0.15s;
}

.skip-link:focus {
  top: 0;
}

/* ── No-JS warning ──────────────────────────────────────────────────────── */
.noscript-warning {
  background: #c0392b;
  color: #fff;
  text-align: center;
  padding: 0.85rem 1rem;
  font-weight: 600;
}

/* ── Base ───────────────────────────────────────────────────────────────── */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ─────────────────────────────────────────────────────────────── */
header {
  background: var(--cambridge-blue);
  color: #fff;
  padding: 1.5rem 1rem;
}

.header-inner {
  max-width: 1000px;
  min-width: 350px;
  margin: 0 auto;
}

header h1 {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(1.35rem, 4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.2;
}

.subtitle {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  opacity: 0.88;
  letter-spacing: 0.01em;
}

/* ── Main / container ───────────────────────────────────────────────────── */
main {
  flex: 1;
  width: 100%;
  max-width: 1000px;
  min-width: 350px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* ── Footer ─────────────────────────────────────────────────────────────── */
footer {
  background: var(--cambridge-blue);
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
  padding: 1rem;
  font-size: 0.85rem;
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.card h2 {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.3rem;
  color: var(--cambridge-blue);
  margin-bottom: 1rem;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h2 {
  margin-bottom: 0.35rem;
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid var(--cambridge-light);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--cambridge-blue);
  color: #fff;
}

.btn-primary:not(:disabled):hover {
  background: var(--cambridge-mid);
}

.btn-secondary {
  background: var(--cambridge-light);
  color: #fff;
}

.btn-secondary:not(:disabled):hover {
  background: var(--cambridge-mid);
}

.btn-outline {
  background: transparent;
  border-color: var(--cambridge-blue);
  color: var(--cambridge-blue);
}

.btn-outline:not(:disabled):hover {
  background: var(--cambridge-pale);
}

.btn-full {
  width: 100%;
}

/* ── Forms ──────────────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 1.1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.form-group input[type="text"],
.form-group input[type="password"] {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--text);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus {
  outline: none;
  border-color: var(--cambridge-blue);
  box-shadow: 0 0 0 3px rgba(108, 172, 228, 0.3);
}

/* ── Top bar ────────────────────────────────────────────────────────────── */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.top-bar-user {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.top-bar-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* ── Drop zone ──────────────────────────────────────────────────────────── */
#drop-zone {
  border: 2px dashed var(--cambridge-light);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  color: var(--text-muted);
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
  margin: 1.25rem 0;
}

#drop-zone:hover,
#drop-zone:focus-visible {
  background: var(--cambridge-pale);
  border-color: var(--cambridge-blue);
  color: var(--cambridge-blue);
  outline: none;
}

#drop-zone.drag-over {
  background: var(--cambridge-pale);
  border-color: var(--cambridge-blue);
  border-style: solid;
  color: var(--cambridge-blue);
}

#drop-zone.drop-zone-disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

#drop-zone svg {
  display: block;
  margin: 0 auto 1rem;
  color: var(--cambridge-light);
  transition: color var(--transition);
}

#drop-zone:hover svg,
#drop-zone:focus-visible svg,
#drop-zone.drag-over svg {
  color: var(--cambridge-blue);
}

.drop-zone-primary {
  font-size: 1rem;
  font-weight: 500;
}

.link-style {
  color: var(--cambridge-blue);
  text-decoration: underline;
  font-weight: 600;
}

.drop-zone-hint {
  font-size: 0.85rem;
  margin-top: 0.4rem;
  opacity: 0.75;
}

/* ── Hidden file input (shown only via the drop zone) ───────────────────── */
#file-input {
  display: none;
}

/* ── File info ──────────────────────────────────────────────────────────── */
.file-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  background: var(--cambridge-pale);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--cambridge-blue);
  font-weight: 500;
  margin-bottom: 0.75rem;
  word-break: break-all;
}

.file-size {
  color: var(--text-muted);
  font-weight: 400;
  white-space: nowrap;
}

/* ── Media player ───────────────────────────────────────────────────────── */
#player-container {
  margin: 1rem 0;
}

#audio-player,
#video-player {
  width: 100%;
  border-radius: var(--radius);
  display: block;
}

#video-player {
  max-height: 360px;
  background: #000;
}

.recording-preview {
  width: 100%;
  max-height: 360px;
  border-radius: var(--radius);
  display: block;
  background: #000;
  margin-bottom: 1rem;
}

.recording-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.recording-status {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.recording-timer {
  color: var(--cambridge-blue);
  font-size: 1.05rem;
  font-weight: 700;
}

.recording-warning {
  color: #8a5b00;
  font-size: 0.92rem;
  margin: 0.9rem 0;
  padding: 0.6rem 0.85rem;
  background: #fff6db;
  border-left: 3px solid #d89b00;
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ── Error messages ─────────────────────────────────────────────────────── */
.error-msg {
  color: var(--error);
  font-size: 0.9rem;
  margin: 0.75rem 0;
  padding: 0.6rem 0.85rem;
  background: #fdf0ef;
  border-left: 3px solid var(--error);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ── Action row ─────────────────────────────────────────────────────────── */
.action-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
  align-items: center;
}

/* ── Progress / spinner ─────────────────────────────────────────────────── */
#progress-area {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
  color: var(--text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--cambridge-blue);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
  margin: 0 auto 0.85rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#progress-msg {
  font-size: 0.95rem;
}

/* ── Feedback body (rendered markdown) ──────────────────────────────────── */
.feedback-body {
  font-size: 0.97rem;
  line-height: 1.75;
}

.feedback-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.history-empty {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.history-item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  text-align: left;
  transition:
    border-color var(--transition),
    background var(--transition),
    box-shadow var(--transition);
}

.history-item:hover,
.history-item:focus-visible {
  background: var(--cambridge-pale);
  border-color: var(--cambridge-light);
  box-shadow: var(--shadow);
  outline: none;
}

.history-item-title {
  color: var(--cambridge-blue);
  font-weight: 600;
  font-size: 0.97rem;
}

.history-item-date {
  color: var(--text-muted);
  font-size: 0.88rem;
  white-space: normal;
}

.admin-history-item {
  align-items: flex-start;
  flex-direction: column;
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.submission-detail {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.submission-detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.submission-detail-header h3,
.submission-detail-grid h4 {
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--cambridge-blue);
}

.submission-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.detail-text {
  min-height: 220px;
  max-height: 420px;
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.feedback-body h1,
.feedback-body h2,
.feedback-body h3 {
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--cambridge-blue);
  margin: 1.25rem 0 0.4rem;
}

.feedback-body h2 { font-size: 1.15rem; }
.feedback-body h3 { font-size: 1rem; }

/* Suppress the top margin on the very first heading */
.feedback-body > :first-child {
  margin-top: 0;
}

.feedback-body p {
  margin-bottom: 0.75rem;
}

.feedback-body ul,
.feedback-body ol {
  margin: 0.4rem 0 0.75rem 1.5rem;
}

.feedback-body li {
  margin-bottom: 0.3rem;
}

.feedback-body strong {
  font-weight: 700;
  color: var(--text);
}

/* ── Login card (narrower, centred) ─────────────────────────────────────── */
.login-card {
  max-width: 420px;
  margin: 2rem auto 1.5rem;
}

.login-card h2 {
  font-size: 1.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.login-card .btn-full {
  margin-top: 0.5rem;
}

/* ── Fallback for when marked.js CDN is unavailable ────────────────────── */
.feedback-raw {
  white-space: pre-wrap;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ── Intro text ─────────────────────────────────────────────────────────── */
.intro-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

/* ── Responsive — breakpoint at 760 px ──────────────────────────────────── */
@media (max-width: 760px) {
  .card {
    padding: 1.5rem 1.25rem;
  }

  .top-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-bar-actions {
    width: 100%;
    justify-content: flex-end;
  }

  #drop-zone {
    padding: 2rem 1rem;
  }

  .action-row {
    flex-direction: column;
  }

  .action-row .btn {
    width: 100%;
  }

  .section-heading,
  .history-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-heading .btn {
    width: 100%;
  }

  .history-item-date {
    white-space: normal;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   ADMIN PAGE STYLES
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Danger button ──────────────────────────────────────────────────────── */
.btn-danger {
  background: #c0392b;
  color: #fff;
  border-color: transparent;
}

.btn-danger:not(:disabled):hover {
  background: #a93226;
}

/* ── Small button variant (used in table rows) ──────────────────────────── */
.btn-sm {
  padding: 0.3rem 0.75rem;
  font-size: 0.85rem;
}

/* ── Success message ────────────────────────────────────────────────────── */
.success-msg {
  color: #1a6b34;
  font-size: 0.9rem;
  margin: 0.75rem 0;
  padding: 0.6rem 0.85rem;
  background: #eaf7ee;
  border-left: 3px solid #27ae60;
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ── Multi-column form row ──────────────────────────────────────────────── */
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0 1.25rem;
  align-items: end;
  margin-bottom: 1rem;
}

.form-row--narrow {
  grid-template-columns: minmax(180px, 320px);
}

/* Vertically centre the checkbox label within the grid */
.form-group--checkbox {
  display: flex;
  align-items: flex-end;
  padding-bottom: 0.1rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--cambridge-blue);
  cursor: pointer;
}

/* ── Users table ────────────────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;          /* Horizontal scroll on narrow screens */
  -webkit-overflow-scrolling: touch;
}

.users-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.users-table th {
  text-align: left;
  padding: 0.6rem 0.85rem;
  background: var(--cambridge-pale);
  color: var(--cambridge-blue);
  font-weight: 700;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

.users-table td {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

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

.users-table tbody tr:hover {
  background: var(--cambridge-pale);
}

/* Truncated UUID — full value shown on hover via title attribute */
.user-id-cell span {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: default;
}

/* ── Role badges ────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.badge-admin {
  background: var(--cambridge-blue);
  color: #fff;
}

.badge-user {
  background: var(--border);
  color: var(--text-muted);
}

/* ── Empty / loading states ─────────────────────────────────────────────── */
.loading-msg,
.no-data-msg {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 0.5rem 0;
}

/* ── Confirmation modal ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  padding: 2rem;
  max-width: 440px;
  width: 100%;
}

.modal h3 {
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--cambridge-blue);
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.modal p {
  color: var(--text);
  font-size: 0.97rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* ── Admin responsive ───────────────────────────────────────────────────── */
@media (max-width: 760px) {
  .form-row {
    grid-template-columns: 1fr;
  }

  .modal-actions {
    flex-direction: column-reverse;
  }

  .modal-actions .btn {
    width: 100%;
  }
}