/* Base */
:root {
  --color-bg: #0f172a;
  --color-bg-elevated: #1e293b;
  --color-border: #334155;
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-accent: #38bdf8;
  --color-accent-text: #0f172a;
  --color-orange: #f59e0b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

/* Sidebar nav */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 16rem;
  height: 100vh;
  background: var(--color-bg-elevated);
  border-right: 1px solid var(--color-border);
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar--open {
  transform: translateX(0);
}

.sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.sidebar__title {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
}

.sidebar__title:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.sidebar__close {
  all: unset;
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--color-text-muted);
  padding: 0.25rem;
}

.sidebar__close:hover {
  color: var(--color-text);
}

.sidebar__links {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 0;
}

.sidebar__links a {
  padding: 0.625rem 1.25rem;
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: background 0.1s;
}

.sidebar__links a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-accent);
  text-decoration: none;
}

.sidebar__backdrop {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.sidebar__backdrop--visible {
  opacity: 1;
  pointer-events: auto;
}

/* Menu button */
.menu-btn {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  background: var(--color-bg-elevated);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.15s;
}

.menu-btn:hover {
  background: var(--color-border);
}

/* Main */
.site-main {
  max-width: 90rem;
  margin: 0 auto;
  padding: 1rem 1.5rem 2rem;
  padding-top: 3.5rem;
}

/* ── Viewer page (desktop: player top + library bottom) ── */

.viewer-page {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Player */
.viewer-player {
  width: 100%;
}

.viewer-player__frame {
  position: relative;
  width: 100%;
  max-width: 64rem;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 0.5rem;
  overflow: hidden;
}

.viewer-player__frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.viewer-player__empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--color-text-muted);
}

.viewer-player__empty-icon {
  font-size: 3rem;
  opacity: 0.3;
}

.viewer-player__empty p {
  margin: 0;
  font-size: 1rem;
}

.viewer-player__info {
  max-width: 64rem;
  margin: 0 auto;
  padding: 0.75rem 0.25rem 0;
}

.viewer-player__title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  min-height: 1.5em;
}

/* Library */
.viewer-library {
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}

.viewer-library__controls {
  margin-bottom: 1.25rem;
}

.viewer-library__search {
  width: 100%;
  max-width: 24rem;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  background: var(--color-bg);
  color: var(--color-text);
}

.viewer-library__masonry {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1rem;
  align-content: start;
}

.viewer-library__empty {
  margin-top: 2rem;
  color: var(--color-text-muted);
}

/* Section */
.viewer-section {
  padding: 1rem;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
}

.viewer-section__title {
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-orange);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--color-border);
}

.viewer-section__grid {
  display: grid;
  gap: 0.75rem;
}

/* Thumbnail button */
.viewer-thumb {
  all: unset;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  border-radius: 0.375rem;
  overflow: hidden;
  border: 2px solid transparent;
  transition: border-color 0.15s, box-shadow 0.15s;
  background: var(--color-bg);
}

.viewer-thumb:hover {
  border-color: var(--color-accent);
}

.viewer-thumb:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.viewer-thumb--active {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.viewer-thumb__img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #111;
}

.viewer-thumb__img-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.15s;
}

.viewer-thumb:hover .viewer-thumb__img-wrap img {
  opacity: 0.8;
}

.viewer-thumb__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
  background: rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: opacity 0.15s;
}

.viewer-thumb:hover .viewer-thumb__play {
  opacity: 1;
}

.viewer-thumb__label {
  padding: 0.375rem 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

.viewer-thumb--active .viewer-thumb__label {
  color: var(--color-accent);
}

@media (max-width: 50rem) {
  .viewer-library__masonry {
    grid-template-columns: 1fr;
  }

  .viewer-section {
    grid-column: span 1 !important;
  }

  .viewer-section__grid {
    grid-template-columns: 1fr !important;
  }
}

/* Home & Tools pages */
.page-content h1 {
  margin: 0 0 1rem;
  font-size: 1.75rem;
}

.page-content p {
  margin: 0 0 1rem;
  color: var(--color-text-muted);
}

.page-content ul {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

/* Edit page */
.edit-page {
  max-width: 64rem;
}

.edit-page__header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.edit-page__title {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

.edit-page__subtitle {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.edit-page__header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.edit-page__btn {
  padding: 0.5rem 1rem;
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  background: var(--color-bg-elevated);
  color: var(--color-text);
  cursor: pointer;
}

.edit-page__btn:hover {
  background: var(--color-border);
}

.edit-page__btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}

.edit-page__btn--primary:hover {
  filter: brightness(1.1);
}

.edit-page__btn--small {
  padding: 0.25rem 0.5rem;
  font-size: 0.8125rem;
}

.edit-page__sections-layout {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
  min-height: 24rem;
}

.edit-page__sections-column {
  flex: 1;
  min-width: 0;
}

.edit-page__sections-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.edit-page__sections-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.edit-page__section-delete {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  padding: 0;
  font-size: 1.25rem;
  line-height: 1;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: pointer;
}

.edit-page__section-delete:hover {
  color: #f87171;
  border-color: #f87171;
}

.edit-page__sections {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.edit-page__section {
  padding: 0.75rem;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
}

.edit-page__section-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.edit-page__section-drag {
  padding: 0.25rem;
  cursor: grab;
  color: var(--color-text-muted);
  font-size: 1rem;
  user-select: none;
}

.edit-page__section-drag:active {
  cursor: grabbing;
}

.edit-page__section-name {
  flex: 1;
  min-width: 0;
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-bg);
  color: var(--color-text);
}

.edit-page__section-cards,
.edit-page__other-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  min-height: 2.5rem;
  padding: 0.5rem;
  border: 1px dashed var(--color-border);
  border-radius: 0.25rem;
  background: rgba(0, 0, 0, 0.15);
}

.edit-page__section-cards.edit-page__drop-zone--active,
.edit-page__other-cards.edit-page__drop-zone--active {
  border-color: var(--color-accent);
  background: rgba(56, 189, 248, 0.08);
}

.edit-page__video-card {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: grab;
  max-width: 10rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.edit-page__video-card:hover {
  border-color: var(--color-accent);
}

.edit-page__video-card:active {
  cursor: grabbing;
}

.edit-page__video-card--dragging {
  opacity: 0.5;
}

.edit-page__video-card-placeholder {
  width: 10rem;
  min-height: 1.75rem;
  border: 2px dashed var(--color-accent);
  border-radius: 0.25rem;
  background: rgba(56, 189, 248, 0.12);
  pointer-events: none;
}

.edit-page__right-column {
  flex: 0 0 26rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.edit-page__sticky-wrapper {
  position: sticky;
  top: 1rem;
  align-self: flex-start;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.edit-page__right-column-header {
  display: flex;
  justify-content: flex-end;
}

.edit-page__unassigned-section .edit-page__section-header {
  margin-bottom: 0.5rem;
}

.edit-page__unassigned-section .edit-page__section-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.edit-page__edit-panel {
  min-height: 12rem;
  padding: 1rem;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
}

.edit-page__edit-panel-empty {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.edit-page__edit-form .edit-page__field {
  margin-bottom: 0.75rem;
}

.edit-page__edit-form .edit-page__field--row {
  margin-bottom: 0.25rem;
}

.edit-page__edit-form .edit-page__field:last-of-type {
  margin-bottom: 1rem;
}

.edit-page__edit-form-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.edit-page__btn--danger {
  color: #f87171;
  border-color: #f87171;
}

.edit-page__btn--danger:hover {
  background: rgba(248, 113, 113, 0.15);
}

.edit-page__video-card--selected {
  border-color: var(--color-accent);
  background: rgba(56, 189, 248, 0.12);
}

@media (max-width: 40rem) {
  .edit-page__sections-layout {
    flex-direction: column;
  }

  .edit-page__right-column {
    flex: 0 0 auto;
  }
}

.edit-page__section--drag-before {
  border-top: 2px solid var(--color-accent);
}

.edit-page__section--drag-after {
  border-bottom: 2px solid var(--color-accent);
}

.edit-page__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.edit-page__status {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.edit-page__status--ok {
  color: var(--color-accent);
}

.edit-page__status--err {
  color: #f87171;
}

.edit-page__field {
  margin-bottom: 1rem;
}

.edit-page__field--row {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.edit-page__field--row .edit-page__field {
  flex: 1;
  margin-bottom: 0;
}

.edit-page__field--row .edit-page__field:last-child {
  flex: 0 0 5rem;
}

.edit-page__field label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.edit-page__field input,
.edit-page__field select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  background: var(--color-bg);
  color: var(--color-text);
}

.edit-page__thumbnail-wrap {
  margin-bottom: 0.75rem;
}

.edit-page__thumbnail-row {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.edit-page__thumbnail {
  display: block;
  flex: 1;
  min-width: 0;
  width: 100%;
  max-width: 20rem;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.375rem;
  border: 1px solid var(--color-border);
}

.edit-page__youtube-link {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  transition: background 0.15s, border-color 0.15s;
}

.edit-page__youtube-link:hover:not(.edit-page__youtube-link--disabled) {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--color-accent);
}

.edit-page__youtube-link--disabled {
  color: var(--color-text-muted);
  cursor: not-allowed;
  pointer-events: none;
}