:root {
  color-scheme: dark;
  --bg: #07100f;
  --panel: #101a18;
  --soft: #172421;
  --line: #2b3a36;
  --ink: #f0f5f2;
  --muted: #91a39d;
  --accent: #50e3a4;
  --accent-dark: #123f31;
  --danger: #ff8d8d;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: radial-gradient(circle at 15% 0, rgba(80, 227, 164, .13), transparent 35rem), var(--bg);
}

button,
input,
select {
  font: inherit;
}

.hidden {
  display: none !important;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  z-index: 10;
  background: var(--panel);
  padding: 10px;
}

.skip-link:focus {
  transform: none;
}

.topbar {
  min-height: 72px;
  padding: 0 clamp(20px, 5vw, 70px);
  display: flex;
  align-items: center;
  gap: 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 16, 15, .9);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand span:last-child,
.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: #062015;
  font-weight: 900;
}

.nav {
  display: flex;
  gap: 4px;
  margin-right: auto;
}

.nav-button,
.entity-tab,
.tab {
  border: 0;
  color: var(--muted);
  background: transparent;
  padding: 10px 13px;
  border-radius: 9px;
  cursor: pointer;
}

.nav-button.active,
.entity-tab.active,
.tab.active {
  color: var(--ink);
  background: var(--soft);
}

.session {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: .82rem;
}

main {
  width: min(1500px, 100%);
  margin: auto;
}

.auth-layout {
  min-height: calc(100vh - 73px);
  display: grid;
  grid-template-columns: 1.2fr minmax(340px, .6fr);
  align-items: center;
  gap: 8vw;
  padding: clamp(30px, 8vw, 100px);
}

h1 {
  font-size: clamp(2.3rem, 5vw, 4.8rem);
  line-height: 1;
  margin: .1em 0;
  letter-spacing: -.045em;
}

.lead {
  max-width: 650px;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.7;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 800;
}

.feature-row {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
}

.feature-row span,
.stat-pill {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: .78rem;
}

.card {
  border: 1px solid var(--line);
  background: rgba(16, 26, 24, .94);
  border-radius: 20px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .2);
}

.auth-card {
  padding: 28px;
  display: grid;
  gap: 18px;
}

.tabs,
.entity-tabs {
  display: flex;
  gap: 5px;
  background: #0a1311;
  border-radius: 11px;
  padding: 5px;
}

label {
  display: grid;
  gap: 7px;
  color: #c9d4d0;
  font-size: .85rem;
}

input,
select {
  width: 100%;
  padding: 12px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #091311;
  color: var(--ink);
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.button {
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 11px 15px;
  cursor: pointer;
  color: var(--ink);
}

.primary {
  background: var(--accent);
  color: #062015;
  border-color: var(--accent);
  font-weight: 800;
}

.secondary {
  background: transparent;
}

.oauth-button {
  text-align: center;
  text-decoration: none;
}

.button:disabled {
  opacity: .4;
  cursor: not-allowed;
}

.message {
  color: var(--danger);
  min-height: 20px;
}

.workspace {
  padding: 32px clamp(18px, 4vw, 60px);
}

.page-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 24px;
}

.page-heading h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
}

.muted {
  color: var(--muted);
}

.filter-bar {
  display: grid;
  grid-template-columns: repeat(5, 1fr) auto auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 18px;
}

.catalog-layout {
  display: grid;
  grid-template-columns: 390px 1fr;
  gap: 18px;
}

.catalog-panel,
.player-panel,
.admin-card,
.import-card {
  padding: 22px;
}

.recording-list {
  display: grid;
  gap: 9px;
  min-height: 550px;
}

.recording-button {
  padding: 14px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #0a1311;
  color: var(--ink);
  cursor: pointer;
}

.recording-button strong,
.recording-button span,
.recording-button small {
  display: block;
}

.recording-button span,
.recording-button small {
  margin-top: 5px;
  color: var(--muted);
}

.recording-button small {
  font-size: .7rem;
}

.recording-button:hover {
  border-color: var(--accent);
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.media-frame {
  display: block;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border: 0;
  border-radius: 13px;
  margin-top: 18px;
}

#youtube-player,
#youtube-player iframe {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 13px;
}

.chapter-timeline {
  height: 14px;
  margin-top: 10px;
  border-radius: 999px;
  background: #091311;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.chapter-segment {
  position: absolute;
  top: 0;
  bottom: 0;
  border: 0;
  border-right: 2px solid var(--bg);
  background: var(--accent);
  opacity: .55;
  cursor: pointer;
  padding: 0;
}

.chapter-segment:hover,
.chapter-segment:focus-visible {
  opacity: 1;
  outline: 2px solid var(--ink);
  outline-offset: -2px;
}

.chapter-section {
  display: grid;
  grid-template-columns: 1fr minmax(260px, .7fr);
  gap: 16px;
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
}

.chapter-list {
  display: grid;
  gap: 7px;
}

.chapter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px;
  border-radius: 9px;
  background: #091311;
}

.chapter-jump {
  flex: 1;
  border: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.chapter-jump span {
  display: block;
  color: var(--muted);
  font-size: .75rem;
  margin-top: 3px;
}

.chapter-actions {
  display: flex;
  gap: 4px;
}

.chapter-form {
  display: grid;
  gap: 10px;
  align-content: start;
}

.checkpoint {
  display: flex;
  justify-content: space-between;
  padding: 13px 3px;
  color: var(--muted);
}

.rating-actions {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
}

.rating-actions span {
  color: var(--muted);
  margin-right: auto;
}

.rating-actions .active {
  color: #062015;
  background: var(--accent);
  border-color: var(--accent);
}

#recording-materials {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

#recording-materials a {
  color: var(--accent);
}

.history-panel {
  border-top: 1px solid var(--line);
  margin-top: 18px;
  padding-top: 12px;
}

.history-panel .recording-list {
  min-height: 0;
  max-height: 260px;
  overflow: auto;
}

.history-item {
  display: grid;
  gap: 3px;
  padding: 9px;
  border-left: 2px solid var(--accent);
}

.history-item small {
  color: var(--muted);
}

.preference-panel {
  border-top: 1px solid var(--line);
  margin-top: 18px;
  padding-top: 12px;
  display: grid;
  gap: 10px;
}

.preference-panel label {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preference-panel input {
  width: auto;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 14px;
}

.metrics div {
  padding: 16px;
  background: #0a1311;
  border: 1px solid var(--line);
  border-radius: 11px;
}

.metrics span,
.metrics strong {
  display: block;
}

.metrics span {
  color: var(--muted);
  font-size: .75rem;
}

.metrics strong {
  margin-top: 8px;
}

.admin-grid {
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 18px;
}

.entity-tabs {
  overflow: auto;
  margin: 18px 0;
}

.entity-tab {
  white-space: nowrap;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

form#entity-form {
  display: grid;
  gap: 13px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.form-actions {
  display: flex;
  gap: 9px;
}

.entity-list {
  display: grid;
  gap: 7px;
  margin-top: 18px;
  max-height: 420px;
  overflow: auto;
}

.entity-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.entity-row strong,
.entity-row span {
  display: block;
}

.entity-row span {
  color: var(--muted);
  font-size: .75rem;
  margin-top: 3px;
}

.entity-row.inactive {
  opacity: .45;
}

.icon-button {
  border: 0;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
}

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

.import-card {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.drop-zone {
  padding: 32px 20px;
  border: 1px dashed var(--accent);
  border-radius: 14px;
  text-align: center;
  cursor: pointer;
  background: var(--accent-dark);
}

.drop-zone span,
.drop-zone strong {
  display: block;
}

.drop-zone span {
  color: var(--muted);
  margin-top: 7px;
}

.drop-zone input {
  display: none;
}

.import-card a {
  color: var(--accent);
}

.import-result {
  padding: 14px;
  background: #0a1311;
  border-radius: 10px;
  min-height: 48px;
}

.csv-downloads {
  display: grid;
  gap: 7px;
  margin: 14px 0;
}

.import-card code {
  display: block;
  white-space: normal;
  color: var(--muted);
  margin-top: 10px;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 50px 10px;
}

.enrollment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.enrollment-card {
  padding: 20px;
  display: grid;
  gap: 9px;
}

.enrollment-card h2 {
  margin: 0;
}

.enrollment-meta {
  color: var(--muted);
}

.status-active {
  color: var(--accent);
}

/* ── Módulo de Material Adjunto ────────────────────────────────────────────── */
.materials-section {
  margin-top: 22px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.materials-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 10px;
  flex-wrap: wrap;
}

.materials-header h3 {
  margin: 0;
  font-size: 1rem;
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 10px;
}

.material-card {
  background: #0a1311;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color .2s;
}

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

.material-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.material-name {
  font-size: .82rem;
  font-weight: 600;
  word-break: break-all;
  color: var(--ink);
}

.material-meta {
  font-size: .72rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.material-badge {
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--soft);
  border: 1px solid var(--line);
  font-size: .68rem;
}

.material-badge.version {
  color: var(--accent);
  border-color: var(--accent-dark);
  background: var(--accent-dark);
}

.material-actions {
  display: flex;
  gap: 6px;
  margin-top: auto;
}

.material-actions .button {
  padding: 6px 10px;
  font-size: .78rem;
  flex: 1;
  text-align: center;
}

.material-download-count {
  font-size: .7rem;
  color: var(--muted);
  text-align: right;
  margin-top: 2px;
}

/* Zona de subida de archivos */
.material-upload-zone {
  border: 1.5px dashed var(--accent);
  border-radius: 13px;
  padding: 22px 16px;
  text-align: center;
  cursor: pointer;
  background: var(--accent-dark);
  transition: background .2s;
}

.material-upload-zone:hover,
.material-upload-zone.drag-over {
  background: rgba(80, 227, 164, .12);
}

.material-upload-zone strong {
  display: block;
  color: var(--ink);
}

.material-upload-zone span {
  display: block;
  color: var(--muted);
  font-size: .78rem;
  margin-top: 6px;
}

.material-upload-zone input {
  display: none;
}

/* Barra de progreso de carga */
.upload-progress {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  margin-top: 10px;
  overflow: hidden;
}

.upload-progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width .3s;
  width: 0%;
}

.upload-status {
  font-size: .78rem;
  color: var(--muted);
  margin-top: 6px;
  min-height: 18px;
}

.upload-status.ok {
  color: var(--accent);
}

.upload-status.err {
  color: var(--danger);
}

/* Modal de versiones */
.versions-panel {
  background: #0a1311;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  margin-top: 8px;
  display: none;
}

.versions-panel.open {
  display: block;
}

.version-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: .8rem;
  color: var(--muted);
}

.version-row:last-child {
  border-bottom: none;
}

.version-row strong {
  color: var(--ink);
}

/* ── Práctica 5: cuaderno Markdown sincronizado ──────────────────────────── */
.learning-workspace {
  display: grid;
  grid-template-columns: minmax(460px, 1.25fr) minmax(330px, .75fr);
  gap: 18px;
  align-items: start;
}

.video-column {
  min-width: 0;
}

.note-panel {
  background: #08110f;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  min-width: 0;
}

.note-header,
.note-actions,
.note-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.note-header {
  justify-content: space-between;
  margin-bottom: 12px;
}

.note-header h3,
.note-header p {
  margin: 0;
}

.note-status {
  color: var(--muted);
  font-size: .72rem;
}

.note-status.saved {
  color: var(--accent);
}

.note-status.error {
  color: var(--danger);
}

.note-toolbar {
  padding: 8px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 10px 10px 0 0;
}

.note-toolbar button {
  border: 1px solid var(--line);
  background: #0d1b18;
  color: var(--ink);
  border-radius: 7px;
  padding: 6px 9px;
  cursor: pointer;
  font: inherit;
  font-size: .72rem;
}

.note-toolbar button:hover,
.note-toolbar button:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

.note-editor-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

#note-editor {
  width: 100%;
  min-height: 280px;
  resize: vertical;
  border-radius: 0 0 10px 10px;
  border: 1px solid var(--line);
  border-top: 0;
  background: #050c0a;
  color: var(--ink);
  padding: 14px;
  font: 500 .84rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

#note-editor:focus {
  outline: 2px solid var(--accent-dark);
  border-color: var(--accent);
}

#note-editor:disabled {
  opacity: .55;
}

.note-actions {
  margin-top: 10px;
}

.note-actions .button {
  padding: 8px 10px;
  font-size: .72rem;
}

.note-hint,
.note-preview-heading {
  color: var(--muted);
  font-size: .72rem;
}

.note-hint {
  margin: 9px 0 14px;
}

.note-preview-heading {
  border-bottom: 1px solid var(--line);
  padding-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.note-preview {
  min-height: 180px;
  max-height: 360px;
  overflow: auto;
  padding: 10px 4px;
  color: #dbe9e4;
  font-size: .84rem;
  line-height: 1.6;
}

.note-preview h1,
.note-preview h2,
.note-preview h3,
.note-preview h4 {
  margin: 12px 0 7px;
  color: var(--ink);
}

.note-preview p,
.note-preview ul,
.note-preview ol,
.note-preview blockquote {
  margin: 7px 0;
}

.note-preview blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 10px;
  color: var(--muted);
}

.note-preview pre {
  overflow-x: auto;
  background: #020706;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 12px;
}

.note-preview code {
  color: #c9f5e4;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.code-keyword {
  color: #ffcb6b;
  font-weight: 700;
}

.note-timestamp {
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent-dark);
  color: var(--accent);
  padding: 2px 7px;
  cursor: pointer;
  font: inherit;
}

.note-formula {
  display: inline-block;
  color: #b9d8ff;
  background: #0a1724;
  border-radius: 5px;
  padding: 1px 5px;
  font-family: Georgia, serif;
}

.note-empty {
  color: var(--muted);
  font-style: italic;
}

.forum-timeline {
  position: relative;
  height: 18px;
  margin: -3px 6px 10px;
  border-top: 2px solid var(--line);
}

.forum-marker {
  position: absolute;
  top: -8px;
  width: 15px;
  height: 15px;
  padding: 0;
  transform: translateX(-50%);
  border: 2px solid #07100f;
  border-radius: 50%;
  background: #ffcb6b;
  cursor: pointer;
  z-index: 2;
}

.forum-marker-preview {
  display: none;
  position: absolute;
  left: 50%;
  bottom: 22px;
  width: 230px;
  max-width: 60vw;
  padding: 8px 10px;
  transform: translateX(-50%);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #050c0a;
  box-shadow: 0 8px 25px rgba(0,0,0,.35);
  font-size: .74rem;
  text-align: left;
  pointer-events: none;
}

.forum-marker:hover .forum-marker-preview,
.forum-marker:focus .forum-marker-preview {
  display: block;
}

.forum-section {
  margin-top: 20px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(16,26,24,.72);
}

.forum-heading,
.forum-meta,
.forum-time-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.forum-heading h3,
.forum-heading p {
  margin: 0 0 4px;
}

.forum-question-form {
  display: grid;
  gap: 10px;
  margin: 14px 0 18px;
}

.forum-question-form textarea,
.forum-answer-form textarea {
  width: 100%;
  min-height: 74px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #07100f;
  color: var(--ink);
  padding: 10px;
  font: inherit;
}

.forum-time-row input {
  flex: 1;
}

.forum-list,
.forum-answers {
  display: grid;
  gap: 10px;
}

.forum-question,
.forum-answer {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0b1412;
}

.forum-answer {
  margin-left: 18px;
  background: #111d1a;
}

.forum-answer.verified {
  border-color: var(--accent);
  box-shadow: inset 3px 0 var(--accent);
}

.forum-jump {
  border: 0;
  padding: 0;
  color: #ffcb6b;
  background: transparent;
  font-weight: 800;
  cursor: pointer;
  text-align: left;
}

.forum-body,
.forum-answer p {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.role-badge,
.verified-badge {
  border-radius: 999px;
  padding: 3px 8px;
  background: var(--soft);
  color: var(--muted);
  font-size: .68rem;
  text-transform: capitalize;
}

.verified-badge {
  background: var(--accent-dark);
  color: var(--accent);
}

.forum-answer-form {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 8px;
  margin-top: 12px;
}

.forum-verify {
  padding: 6px 9px;
  font-size: .7rem;
}

@media (max-width: 1250px) {
  .learning-workspace {
    grid-template-columns: 1fr;
  }
}

.playlist-layout{display:grid;grid-template-columns:minmax(240px,320px) 1fr;gap:20px}.playlist-form-card{align-self:start}.playlist-grid{display:grid;gap:14px}.playlist-card{padding:20px}.playlist-card-head{display:flex;justify-content:space-between;gap:16px;align-items:start}.playlist-actions,.playlist-item-actions{display:flex;gap:8px;flex-wrap:wrap}.playlist-items{display:grid;gap:8px;margin:14px 0}.playlist-item,.shared-item{display:flex;justify-content:space-between;gap:14px;padding:12px;border:1px solid var(--line);border-radius:12px;color:inherit;text-decoration:none}.playlist-item span,.shared-item span{color:var(--muted)}.playlist-add-form{display:grid;grid-template-columns:minmax(180px,2fr) repeat(4,minmax(90px,1fr)) auto;gap:8px;align-items:end}.playlist-share{word-break:break-all;font-size:.78rem}.shared-page{max-width:900px;margin:50px auto;padding:20px}.shared-items{display:grid;gap:10px;margin-top:20px}
@media(max-width:900px){.playlist-layout{grid-template-columns:1fr}.playlist-add-form{grid-template-columns:1fr 1fr}.playlist-add-form button{grid-column:1/-1}}

@media (max-width: 1050px) {
  .filter-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .catalog-layout,
  .admin-grid {
    grid-template-columns: 1fr;
  }

  .recording-list {
    min-height: 0;
  }

  .auth-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 650px) {
  .topbar {
    flex-wrap: wrap;
    padding: 14px;
  }

  .session {
    width: 100%;
    justify-content: space-between;
  }

  .workspace {
    padding: 20px 12px;
  }

  .filter-bar,
  .metrics {
    grid-template-columns: 1fr;
  }

  .page-heading {
    align-items: start;
    gap: 10px;
  }

  .page-heading .stat-pill {
    display: none;
  }
}