/* ============================================
   SchoolTube – Dark-mode YouTube-style Theme
   ============================================ */

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

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-elevated: #222222;
  --bg-hover: #2a2a2a;
  --bg-card: #181818;
  --surface: #272727;

  --text-primary: #f1f1f1;
  --text-secondary: #aaaaaa;
  --text-muted: #717171;

  --accent: #ff0033;
  --accent-hover: #cc0029;
  --accent-glow: rgba(255, 0, 51, 0.25);

  --border: #333333;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h: 64px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ---------- Header ---------- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 15, 0.88);
  backdrop-filter: blur(18px) saturate(1.6);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.5px;
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.logo:hover {
  opacity: 0.85;
}

.logo-icon {
  width: 30px;
  height: auto;
}

/* Search bar */
.search-bar {
  flex: 1;
  max-width: 620px;
  display: flex;
  margin: 0 auto;
}

.search-bar input {
  flex: 1;
  height: 42px;
  padding: 0 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-bar input::placeholder {
  color: var(--text-muted);
}

.search-bar input:focus {
  border-color: #555;
  box-shadow: inset 0 0 0 1px #555;
}

.search-bar button {
  width: 56px;
  display: grid;
  place-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition);
}

.search-bar button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}

.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ---------- Main ---------- */
#main-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* ---------- Welcome Hero ---------- */
.welcome-hero {
  display: grid;
  place-items: center;
  min-height: calc(70vh - var(--header-h));
  text-align: center;
  animation: fadeUp 0.6s ease-out;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.hero-icon {
  width: 88px;
  height: auto;
  filter: drop-shadow(0 0 30px var(--accent-glow));
  animation: pulse-glow 3s ease-in-out infinite;
}

.welcome-hero h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.welcome-hero p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ---------- Player Section ---------- */
.player-section {
  margin-bottom: 32px;
  animation: fadeUp 0.4s ease-out;
}

.player-wrapper {
  max-width: 960px;
  margin: 0 auto;
}

.player-container {
  position: relative;
  width: 100%;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
  aspect-ratio: 16 / 9;
}

.player-container video {
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
}

/* Loading overlay */
.player-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(0, 0, 0, 0.75);
  z-index: 5;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.player-loading[hidden] {
  display: none;
}

/* Error overlay */
.player-error-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.85);
  z-index: 6;
}

.player-error-overlay[hidden] {
  display: none;
}

.player-error-content {
  text-align: center;
  padding: 20px;
}

.player-error-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: 10px;
}

.player-error-content p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 16px;
  max-width: 340px;
  line-height: 1.5;
}

.player-error-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.82rem;
}

.player-info {
  padding: 18px 4px;
}

.player-info-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.player-info h1 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
  flex: 1;
}

.proxy-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.proxy-badge[hidden] {
  display: none;
}

.player-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 12px;
  font-size: 0.85rem;
}

.channel-name {
  color: var(--text-secondary);
  font-weight: 600;
}

.publish-date {
  color: var(--text-muted);
}

.player-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.65;
  white-space: pre-line;
  max-height: 120px;
  overflow-y: auto;
  padding-right: 8px;
}

.player-desc::-webkit-scrollbar {
  width: 5px;
}

.player-desc::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* ---------- Results ---------- */
.results-section {
  animation: fadeUp 0.4s ease-out;
}

.results-heading {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

/* Card */
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  animation: fadeUp 0.45s ease-out both;
}

.video-card:hover {
  transform: translateY(-4px) scale(1.015);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5);
  background: var(--bg-elevated);
}

.video-card:active {
  transform: scale(0.98);
}

.card-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  background: #111;
}

.card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.video-card:hover .card-thumb img {
  transform: scale(1.06);
}

.card-play-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.35);
  opacity: 0;
  transition: opacity var(--transition);
}

.video-card:hover .card-play-overlay {
  opacity: 1;
}

.card-play-overlay svg {
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.5));
}

.card-body {
  padding: 12px 14px 16px;
}

.card-title {
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
  letter-spacing: -0.2px;
}

.card-channel {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-date {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Staggered fade-in for cards */
.video-card:nth-child(1) { animation-delay: 0.03s; }
.video-card:nth-child(2) { animation-delay: 0.06s; }
.video-card:nth-child(3) { animation-delay: 0.09s; }
.video-card:nth-child(4) { animation-delay: 0.12s; }
.video-card:nth-child(5) { animation-delay: 0.15s; }
.video-card:nth-child(6) { animation-delay: 0.18s; }
.video-card:nth-child(7) { animation-delay: 0.21s; }
.video-card:nth-child(8) { animation-delay: 0.24s; }
.video-card:nth-child(9) { animation-delay: 0.27s; }
.video-card:nth-child(10) { animation-delay: 0.30s; }
.video-card:nth-child(11) { animation-delay: 0.33s; }
.video-card:nth-child(12) { animation-delay: 0.36s; }

/* Load more */
.load-more-wrap {
  display: flex;
  justify-content: center;
  margin-top: 32px;
}

/* ---------- Buttons ---------- */
.btn-primary {
  padding: 10px 28px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 18px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary {
  padding: 10px 28px;
  background: var(--surface);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.btn-secondary:hover {
  background: var(--bg-hover);
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  animation: fadeIn 0.25s ease-out;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: min(440px, 90vw);
  box-shadow: 0 16px 60px rgba(0, 0, 0, 0.6);
  animation: scaleIn 0.3s ease-out;
}

.modal.modal-wide {
  width: min(500px, 92vw);
}

.modal h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.modal p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 18px;
}

.modal p a {
  color: var(--accent);
  text-decoration: underline;
}

.modal input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.92rem;
  outline: none;
  margin-bottom: 20px;
  transition: border-color var(--transition);
}

.modal input:focus {
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* Settings modal extras */
.select-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

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

.btn-outline {
  padding: 8px 18px;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.82rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.btn-outline:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: #555;
}

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

.test-result {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 1.2em;
  margin-bottom: 10px;
  padding: 0 2px;
}

.test-result.testing {
  color: var(--text-secondary);
}

.test-result.success {
  color: #22c55e;
}

.test-result.fail {
  color: var(--accent);
}

.proxy-tip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 18px;
}

.proxy-tip strong {
  color: var(--text-primary);
}

.proxy-tip a {
  color: #60a5fa;
  text-decoration: underline;
}

.proxy-tip code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.78rem;
  color: #e2e8f0;
}

/* ---------- Toast ---------- */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease;
  z-index: 300;
  pointer-events: none;
  white-space: nowrap;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Loader ---------- */
.loader {
  display: grid;
  place-items: center;
  padding: 60px 0;
}

.loader[hidden] {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ---------- Error ---------- */
.error-msg {
  text-align: center;
  padding: 40px 20px;
  color: var(--accent);
  font-weight: 500;
  font-size: 0.95rem;
  animation: fadeIn 0.3s ease-out;
}

.error-msg[hidden] {
  display: none;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes pulse-glow {
  0%, 100% { filter: drop-shadow(0 0 20px var(--accent-glow)); }
  50% { filter: drop-shadow(0 0 40px rgba(255, 0, 51, 0.45)); }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 12px;
    gap: 10px;
  }

  .logo span {
    display: none;
  }

  .search-bar {
    max-width: none;
    margin: 0;
  }

  .search-bar input {
    height: 38px;
    font-size: 0.88rem;
  }

  .search-bar button {
    width: 46px;
  }

  #main-content {
    padding: 16px 12px 40px;
  }

  .results-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
  }

  .player-info h1 {
    font-size: 1.05rem;
  }

  .welcome-hero h2 {
    font-size: 1.35rem;
  }
}

@media (max-width: 480px) {
  .results-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .card-body {
    padding: 10px 12px 14px;
  }
}

/* Chromebook-optimized: comfortable grid at 1366px */
@media (min-width: 1200px) {
  .results-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}