:root {
  color-scheme: light;
  --ink: #0f0f0f;
  --muted: #606060;
  --subtle: #909090;
  --paper: #ffffff;
  --surface: #f7f7f7;
  --line: rgba(15, 15, 15, 0.12);
  --chip: #f2f2f2;
  --chip-hover: #e6e6e6;
  --accent: #cc0000;
  --accent-hover: #b00000;
  --danger: #c62828;
  font-family: Roboto, Arial, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
}

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

button {
  cursor: pointer;
}

.app-shell {
  width: min(1680px, calc(100% - 48px));
  margin: 0 auto;
  padding: 18px 0 28px;
}

.topbar,
.toolbar,
.card-actions,
.top-actions,
.modal-header,
.modal-actions,
.page-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 58px;
  margin-bottom: 14px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.brand-mark {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0;
}

.top-actions {
  flex: 0 0 auto;
}

.eyebrow,
.source-label {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h2 {
  margin-bottom: 0;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: 0;
  text-wrap: pretty;
}

.library-panel {
  padding: 0;
}

.toolbar {
  margin-bottom: 18px;
}

.player-frame {
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  background: #0f0f0f;
}

.player-frame iframe,
.player-frame video {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-form {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.input-group,
.search-box {
  display: grid;
  gap: 7px;
}

.input-group span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

input,
textarea,
select {
  min-height: 42px;
  width: 100%;
  border: 0;
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
  outline: none;
  padding: 0 12px;
  transition-property: box-shadow, background-color;
  transition-duration: 140ms;
}

textarea {
  min-height: 170px;
  padding: 12px;
  resize: vertical;
  line-height: 1.45;
}

input:focus,
textarea:focus,
select:focus {
  background: #fff;
  box-shadow: inset 0 0 0 2px #1a73e8, 0 0 0 3px rgba(26, 115, 232, 0.14);
}

.primary-button,
.ghost-button,
.icon-button {
  min-width: 40px;
  min-height: 40px;
  border: 0;
  border-radius: 999px;
  transition-property: transform, background-color, box-shadow, color;
  transition-duration: 140ms;
}

.primary-button:active,
.ghost-button:active,
.icon-button:active,
.video-card:active {
  transform: scale(0.96);
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 16px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
}

.primary-button:hover {
  background: #2a2a2a;
}

.ghost-button,
.icon-button {
  background: transparent;
  color: var(--ink);
  font-size: 1.3rem;
}

.ghost-button:hover,
.icon-button:hover {
  background: var(--chip-hover);
}

.status-line {
  min-height: 22px;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  position: relative;
  min-width: min(360px, 48vw);
}

.search-box span {
  position: absolute;
  left: 13px;
  top: 50%;
  color: var(--muted);
  transform: translateY(-50%);
}

.search-box input {
  border-radius: 999px;
  padding-left: 36px;
}

#categoryFilter {
  width: auto;
  min-width: 132px;
  border-radius: 999px;
  background: var(--chip);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 30px 16px;
}

.video-card {
  min-width: 0;
  background: transparent;
  cursor: pointer;
  outline: none;
  transition-property: transform;
  transition-duration: 140ms;
}

.video-card:hover,
.video-card:focus-visible {
  transform: translateY(-1px);
}

.video-card:focus-visible {
  border-radius: 12px;
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.22);
}

.thumbnail-button {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 12px;
  background: #e8e8e8;
}

.thumbnail-button img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  outline: 1px solid rgba(0, 0, 0, 0.1);
  transition-property: transform, filter;
  transition-duration: 180ms;
}

.thumbnail-button:hover img {
  filter: saturate(1.05);
  transform: scale(1.015);
}

.play-mark {
  position: absolute;
  inset: 50% auto auto 50%;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.74);
  color: #fff;
  font-size: 0.95rem;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.25);
  filter: blur(4px);
  transition-property: opacity, transform, filter;
  transition-duration: 160ms;
  transition-timing-function: cubic-bezier(0.2, 0, 0, 1);
}

.video-card:hover .play-mark,
.video-card:focus-visible .play-mark {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  filter: blur(0);
}

.card-body {
  display: grid;
  gap: 8px;
  padding: 10px 0 0;
}

.card-actions {
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
}

.category-pill {
  min-width: 0;
  overflow: hidden;
  border-radius: 999px;
  padding: 4px 8px;
  background: var(--chip);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.edit-button,
.delete-button {
  flex: 0 0 32px;
  min-width: 32px;
  min-height: 32px;
  margin-left: auto;
  color: var(--muted);
  font-size: 1.12rem;
}

.edit-button {
  margin-left: auto;
  font-size: 0.98rem;
}

.delete-button {
  margin-left: 0;
}

.edit-button:hover {
  color: var(--ink);
}

.delete-button:hover {
  color: var(--danger);
}

.empty-state {
  margin: 64px 0;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

.empty-state[hidden] {
  display: none;
}

.page-footer {
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 42px;
  padding: 22px 0 8px;
  color: var(--subtle);
  font-size: 0.82rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(0, 0, 0, 0.52);
  backdrop-filter: blur(6px);
}

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

.modal-panel {
  width: min(720px, 100%);
  max-height: calc(100vh - 44px);
  overflow: auto;
  border-radius: 16px;
  background: var(--paper);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  padding: 20px;
}

.player-modal {
  width: min(1120px, 100%);
}

.player-modal .player-frame {
  margin-top: 16px;
  min-height: 360px;
}

.modal-actions {
  align-items: center;
  gap: 14px;
}

@media (min-width: 1500px) {
  .video-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 1080px) {
  .video-form {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 780px) {
  .app-shell {
    width: min(100% - 28px, 680px);
    padding-top: 12px;
  }

  .topbar,
  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

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

  .controls {
    display: grid;
    width: 100%;
  }

  .search-box {
    min-width: 100%;
  }

  #categoryFilter {
    width: 100%;
  }

  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 12px;
  }

  .modal-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .player-frame,
  .player-modal .player-frame {
    min-height: 220px;
  }
}

@media (max-width: 520px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
}