:root {
  --bg: #fff; --surface: #f2f2f2; --surface-2: #e5e5e5; --text: #0f0f0f; --muted: #606060;
  --border: #dcdcdc; --accent: #e5484d; --accent-text: #fff; --shadow: 0 8px 28px rgba(0,0,0,.18);
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f0f0f; --surface: #272727; --surface-2: #3a3a3a; --text: #f1f1f1; --muted: #aaa; --border: #303030; --shadow: 0 8px 28px rgba(0,0,0,.6); }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.45 Roboto, "Segoe UI", system-ui, sans-serif; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; border-radius: 18px; padding: 8px 16px; background: var(--surface); font-weight: 500; }
button:hover { background: var(--surface-2); }
button:disabled { opacity: .55; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-text); }
button.primary:hover { filter: brightness(1.08); }
button.icon { padding: 6px 10px; border-radius: 50%; background: none; }
button.icon:hover { background: var(--surface); }
input[type=text], input[type=email], input[type=password], input[type=search] {
  width: 100%; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); outline: none;
}
input:focus { border-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.topbar { position: sticky; top: 0; z-index: 20; height: 56px; display: flex; align-items: center; gap: 16px; padding: 0 16px; background: var(--bg); }
.brand { display: flex; align-items: center; gap: 8px; font-size: 19px; font-weight: 700; letter-spacing: -.4px; flex: none; }
.brand img { width: 28px; height: 28px; }
.search { flex: 1; max-width: 620px; margin: 0 auto; }
.search input { border-radius: 20px; }
.layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); }
.sidebar { position: sticky; top: 56px; height: calc(100vh - 56px); padding: 8px; display: flex; flex-direction: column; gap: 2px; }
.sidebar a { display: flex; align-items: center; gap: 14px; padding: 9px 12px; border-radius: 10px; }
.sidebar a:hover { background: var(--surface); }
.sidebar a.active { background: var(--surface); font-weight: 600; }
.sidebar .spacer { flex: 1; }
.sidebar button { background: none; text-align: left; border-radius: 10px; color: var(--muted); font-weight: 400; }
main { padding: 8px 24px 40px; min-width: 0; }

.chips { display: flex; gap: 10px; overflow-x: auto; padding: 6px 0 14px; position: sticky; top: 56px; background: var(--bg); z-index: 10; scrollbar-width: none; }
.chip { flex: none; border-radius: 8px; padding: 6px 12px; }
.chip.active { background: var(--text); color: var(--bg); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 28px 16px; }
.card { display: block; min-width: 0; }
.thumb { position: relative; display: block; aspect-ratio: 16/9; border-radius: 12px; overflow: hidden; background: var(--surface); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb .time { position: absolute; right: 6px; bottom: 6px; padding: 1px 5px; border-radius: 4px; background: rgba(0,0,0,.8); color: #fff; font-size: 12px; font-weight: 500; }
.thumb .pending { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); font-size: 13px; text-align: center; padding: 8px; }
.card h3 { margin-top: 10px; font-size: 15px; font-weight: 600; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.meta { color: var(--muted); font-size: 13px; }
.empty { padding: 56px 16px; text-align: center; color: var(--muted); }
.empty p { margin-bottom: 14px; }

.watch { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 24px; max-width: 1720px; margin: 0 auto; padding-top: 8px; }
.player { position: relative; aspect-ratio: 16/9; background: #000; border-radius: 12px; overflow: hidden; }
.player video { width: 100%; height: 100%; display: block; }
.seekbar { display: flex; align-items: center; gap: 10px; padding: 8px 2px 0; color: var(--muted); font-size: 13px; }
.seekbar input { flex: 1; accent-color: var(--accent); }
.notice { margin-top: 10px; padding: 10px 14px; border-radius: 10px; background: var(--surface); color: var(--muted); font-size: 13px; }
.title-row { display: flex; align-items: flex-start; gap: 8px; margin-top: 12px; }
.title-row h1 { font-size: 20px; line-height: 1.3; font-weight: 700; flex: 1; overflow-wrap: anywhere; }
.title-row form { flex: 1; display: flex; gap: 8px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; }
.actions .meta { flex: 1; min-width: 200px; }
.popover-wrap { position: relative; }
.popover { position: absolute; z-index: 30; top: calc(100% + 6px); right: 0; width: 280px; max-height: 340px; overflow: auto; padding: 12px; border-radius: 12px; background: var(--bg); border: 1px solid var(--border); box-shadow: var(--shadow); }
.popover h3 { font-size: 15px; margin-bottom: 8px; }
.popover label { display: flex; gap: 10px; align-items: center; padding: 6px 2px; cursor: pointer; overflow-wrap: anywhere; }
.popover form { display: flex; gap: 6px; margin-top: 8px; }
.side h2 { font-size: 15px; font-weight: 600; margin-bottom: 10px; }
.side-list { display: flex; flex-direction: column; gap: 8px; }
.row { display: grid; grid-template-columns: 168px minmax(0, 1fr); gap: 10px; padding: 4px; border-radius: 10px; }
.row:hover, .row.current { background: var(--surface); }
.row .thumb { border-radius: 8px; }
.row h3 { margin: 0; font-size: 14px; }

.modal-back { position: fixed; inset: 0; z-index: 50; background: rgba(0,0,0,.6); display: grid; place-items: center; padding: 16px; }
.modal { width: min(760px, 100%); max-height: calc(100vh - 32px); overflow: auto; background: var(--bg); border-radius: 14px; padding: 20px; box-shadow: var(--shadow); }
.modal h2 { font-size: 18px; margin-bottom: 4px; }
.frames { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 14px 0; }
.frame { padding: 0; border-radius: 8px; overflow: hidden; aspect-ratio: 16/9; background: var(--surface); border: 3px solid transparent; position: relative; }
.frame img { width: 100%; height: 100%; object-fit: cover; display: block; }
.frame.selected { border-color: var(--accent); }
.frame span { position: absolute; right: 4px; bottom: 4px; padding: 0 4px; border-radius: 3px; background: rgba(0,0,0,.8); color: #fff; font-size: 11px; }
.scrub { display: flex; align-items: center; gap: 12px; }
.scrub input { flex: 1; accent-color: var(--accent); }
.preview { margin-top: 12px; aspect-ratio: 16/9; max-height: 280px; width: 100%; object-fit: contain; background: #000; border-radius: 8px; display: block; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

.page { max-width: 880px; margin: 0 auto; padding-top: 12px; }
.page > h1 { font-size: 24px; margin-bottom: 14px; }
.dropzone { display: grid; place-items: center; gap: 10px; padding: 56px 20px; border: 2px dashed var(--border); border-radius: 14px; text-align: center; color: var(--muted); cursor: pointer; }
.dropzone.over { border-color: var(--accent); color: var(--text); }
.upload-item { margin-top: 12px; padding: 12px 14px; border-radius: 12px; background: var(--surface); }
.upload-item header { display: flex; justify-content: space-between; gap: 12px; }
.upload-item strong { overflow-wrap: anywhere; font-weight: 600; }
progress { width: 100%; height: 6px; margin-top: 8px; accent-color: var(--accent); }
.error { color: var(--accent); }
.pl-head { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.pl-head h1 { font-size: 24px; flex: 1; min-width: 200px; overflow-wrap: anywhere; }
.pl-row { display: grid; grid-template-columns: 28px 168px minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 6px; border-radius: 10px; }
.pl-row:hover { background: var(--surface); }
.pl-row .n { color: var(--muted); text-align: center; }
.pl-row .tools { display: flex; }
.new-playlist { display: flex; gap: 8px; margin-bottom: 20px; max-width: 460px; }

.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login form { width: min(360px, 100%); display: grid; gap: 12px; }
.login .brand { justify-content: center; font-size: 24px; margin-bottom: 8px; }
#toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 60; padding: 10px 16px; border-radius: 8px; background: var(--text); color: var(--bg); box-shadow: var(--shadow); max-width: calc(100vw - 32px); }

@media (max-width: 1100px) { .watch { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 760px) {
  .layout { grid-template-columns: minmax(0, 1fr); padding-bottom: 60px; }
  .sidebar { position: fixed; top: auto; bottom: 0; left: 0; right: 0; height: auto; z-index: 20; flex-direction: row; justify-content: space-around; background: var(--bg); border-top: 1px solid var(--border); }
  .sidebar .spacer, .sidebar button { display: none; }
  .brand span { display: none; }
  main { padding: 4px 12px 24px; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .row { grid-template-columns: 140px minmax(0, 1fr); }
  .pl-row { grid-template-columns: 110px minmax(0, 1fr); }
  .pl-row .n { display: none; }
  .pl-row .tools { grid-column: 1 / -1; justify-content: flex-end; }
  .frames { grid-template-columns: repeat(2, 1fr); }
}

/* Cursos */
textarea { font: inherit; color: inherit; width: 100%; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); outline: none; resize: vertical; }
textarea:focus { border-color: var(--accent); }
.layout.bare { grid-template-columns: minmax(0, 1fr); }
.layout.bare .sidebar { display: none; }
.layout.bare main { padding: 0; }
.spacer { flex: 1; }

.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 28px; }
.course-card { display: flex; flex-direction: column; gap: 14px; padding: 20px; border-radius: 28px; background: var(--surface); text-align: center; min-width: 0; }
.course-card header { position: relative; min-height: 40px; display: flex; justify-content: center; align-items: center; }
.course-card .ring-wrap { position: absolute; left: 0; top: 0; }
.tag { padding: 4px 12px; border: 1px solid var(--text); border-radius: 16px; font-size: 13px; }
.course-card h2 { font-size: 21px; font-weight: 500; line-height: 1.25; overflow-wrap: anywhere; }
.course-card p { flex: 1; font-size: 15px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical; overflow: hidden; }
.course-go button { width: 70%; padding: 11px; background: var(--surface-2); }
.course-cover { display: block; aspect-ratio: 16/10; border-radius: 16px; overflow: hidden; background: var(--surface-2); }
.course-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cover-empty { display: grid; place-items: center; height: 100%; padding: 16px; color: var(--muted); font-size: 19px; font-weight: 600; text-align: center; }
.ring-wrap { position: relative; display: inline-grid; place-items: center; width: 40px; height: 40px; font-size: 11px; font-weight: 500; }
.ring-wrap > span { grid-area: 1 / 1; }
.ring { grid-area: 1 / 1; width: 40px; height: 40px; }
.ring circle { fill: none; stroke-width: 2.5; }
.ring-track { stroke: var(--surface-2); }
.ring-value { stroke: var(--text); stroke-linecap: round; }

.course-page { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 56px; max-width: 1180px; margin: 0 auto; padding-top: 16px; }
.course-side { display: flex; flex-direction: column; gap: 16px; align-self: start; }
.course-box { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.course-box .course-cover { border-radius: 0; }
.course-box h2 { padding: 16px; font-size: 21px; font-weight: 500; text-align: center; overflow-wrap: anywhere; }
.course-progress { display: grid; gap: 6px; }
.course-progress .bar { height: 7px; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.course-progress .bar span { display: block; height: 100%; border-radius: 4px; background: var(--text); }
.course-progress strong { font-size: 12px; font-weight: 800; }
.curriculum-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.curriculum-head h1 { font-size: 24px; font-weight: 500; }
.curriculum-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.curriculum-tools form { flex: 1; min-width: 260px; display: flex; gap: 8px; }
.curriculum { display: flex; flex-direction: column; gap: 14px; }
.curriculum-row { display: flex; align-items: center; gap: 14px; padding: 14px 18px; border: 1px solid var(--border); border-radius: 8px; font-size: 18px; }
.curriculum-row > a { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.curriculum-row .tools { display: flex; font-size: 14px; }
.check { flex: none; width: 26px; height: 26px; padding: 0; border-radius: 50%; border: 2px solid var(--border); background: none; font-size: 15px; font-weight: 700; line-height: 1; color: var(--bg); }
.check.done { background: var(--text); border-color: var(--text); }
.check:hover { border-color: var(--text); background: none; }
.check.done:hover { background: var(--text); }

.lesson-page { display: grid; grid-template-columns: 320px minmax(0, 1fr); align-items: start; }
.lesson-nav { position: sticky; top: 56px; height: calc(100vh - 56px); overflow-y: auto; padding: 18px 24px; border-right: 4px solid var(--border); display: flex; flex-direction: column; gap: 16px; }
.lesson-nav h2 { font-size: 22px; font-weight: 500; text-align: center; overflow-wrap: anywhere; }
.lesson-list { border-top: 3px solid var(--border); }
.lesson-link { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--border); font-size: 15px; }
.lesson-link a { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.lesson-link.current a { font-weight: 700; }
.lesson-page > article { padding: 18px 48px 56px; max-width: 1120px; width: 100%; margin: 0 auto; min-width: 0; }
.breadcrumb { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 10px 16px; border-radius: 6px; background: var(--surface); font-size: 14px; margin-bottom: 20px; overflow-wrap: anywhere; }
.lesson-footer { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); }

.lesson-content { font-size: 17px; line-height: 1.6; overflow-wrap: anywhere; }
.lesson-content > * { margin: 0 0 16px; }
.lesson-content h1, .lesson-content h2, .lesson-content h3 { line-height: 1.3; margin-top: 28px; }
.lesson-content h1 { font-size: 28px; }
.lesson-content h2 { font-size: 24px; }
.lesson-content h3 { font-size: 20px; }
.lesson-content img { max-width: 100%; height: auto; display: block; border-radius: 4px; }
.lesson-content hr { border: 0; border-top: 1px solid var(--muted); margin: 32px 0; }
.lesson-content blockquote { margin-left: 0; padding: 2px 0 2px 20px; border-left: 2px solid var(--text); font-size: 18px; }
.lesson-content blockquote > :last-child { margin-bottom: 0; }
.lesson-content blockquote > :first-child { margin-top: 0; }
.lesson-content a:not(.file-block) { text-decoration: underline; }
.lesson-content code { padding: 1px 5px; border-radius: 4px; background: var(--surface); font-size: .9em; }
.lesson-content pre { padding: 12px 14px; border-radius: 8px; background: var(--surface); overflow-x: auto; }
.lesson-content pre code { padding: 0; }
.lesson-content table { display: block; overflow-x: auto; border-collapse: collapse; }
.lesson-content th, .lesson-content td { padding: 6px 12px; border: 1px solid var(--border); }
.lesson-video { margin-bottom: 18px; }
.lesson-video .player { border-radius: 4px; }
.video-chip { display: flex; align-items: center; gap: 12px; padding: 8px; border-radius: 8px; background: var(--surface); }
.video-chip img { width: 120px; aspect-ratio: 16/9; object-fit: cover; border-radius: 4px; }
.file-block { display: grid; gap: 8px; padding: 12px 14px; background: var(--surface); font-size: 15px; }
.file-block:hover { background: var(--surface-2); }
.file-label { padding-bottom: 8px; border-bottom: 1px solid var(--border); font-size: 14px; }
.timestamp { padding: 0; border-radius: 3px; background: none; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; font-size: inherit; }
.timestamp:hover { background: var(--surface); color: var(--accent); }

.editor-page { max-width: 1500px; margin: 0 auto; padding: 14px 20px 20px; display: flex; flex-direction: column; gap: 10px; min-height: calc(100vh - 56px); }
.editor-page .breadcrumb { margin-bottom: 0; }
.editor-state { display: flex; align-items: center; gap: 12px; }
.lesson-title { font-size: 20px !important; font-weight: 600; }
.editor-toolbar { display: flex; flex-wrap: wrap; gap: 4px; }
.editor-toolbar button { padding: 6px 11px; border-radius: 8px; font-size: 13px; }
.editor-split { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; min-height: 460px; }
.editor-area { height: 100%; min-height: 460px; resize: none; font: 15px/1.6 ui-monospace, Consolas, monospace; }
.editor-preview { height: calc(100vh - 250px); min-height: 460px; overflow-y: auto; padding: 4px 16px; border: 1px solid var(--border); border-radius: 10px; }

.picker-tabs { display: flex; gap: 8px; margin: 12px 0; }
.picker-results { height: 46vh; margin-top: 10px; overflow-y: auto; }
.picker-row { display: grid; grid-template-columns: 20px 96px minmax(0, 1fr); align-items: center; gap: 10px; padding: 6px; border-radius: 8px; cursor: pointer; }
.picker-row:hover { background: var(--surface); }
.picker-row img, .picker-thumb { display: block; width: 96px; aspect-ratio: 16/9; object-fit: cover; border-radius: 4px; background: var(--surface); }
.picker-row strong { display: block; font-weight: 500; overflow-wrap: anywhere; }
.picker-list { width: 100%; display: flex; justify-content: space-between; gap: 12px; margin-bottom: 6px; border-radius: 8px; text-align: left; }
.modal-actions .spacer { flex: 1; }
.course-form { display: grid; gap: 10px; }
.course-form > button { justify-self: start; }
.cover-pick { width: 240px; max-width: 100%; }

@media (max-width: 900px) {
  .course-page { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .lesson-page { grid-template-columns: minmax(0, 1fr); }
  .lesson-page > article { order: -1; padding: 12px 14px 28px; }
  .lesson-nav { position: static; height: auto; border-right: 0; border-top: 4px solid var(--border); }
  .editor-split { grid-template-columns: minmax(0, 1fr); }
  .editor-preview { height: auto; min-height: 240px; }
}

.new-playlist button, .curriculum-tools button { white-space: nowrap; flex: none; }