:root{--navy:#101e2b;--navy2:#172b3b;--lime:#d2f16d;--ink:#1a2c3b;--muted:#71808a;--line:#e3e8e9;--bg:#f5f7f6;--white:#fff;--radius:16px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:14px;line-height:1.55}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:4px}button{cursor:pointer}button:disabled{cursor:default}h1,h2,h3,p{margin:0}h1{font-size:32px;line-height:1.2;letter-spacing:-1.15px;font-weight:730}h2{font-size:21px;letter-spacing:-.5px}h3{font-size:17px;letter-spacing:-.3px}p{color:var(--muted)}.sidebar{width:248px;position:fixed;inset:0 auto 0 0;background:var(--navy);color:#d5dfe6;padding:32px 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/* Persistent vertical rail: body paints the same dark background below a long page. */
:root{--sidebar-width:248px;--rail-width:72px}
body{background:var(--navy)}
html .sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar-width);height:100vh;height:100dvh;min-height:100vh;display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;overflow:hidden;padding:28px 20px;background:var(--navy);transition:width .22s ease,padding .22s ease}
html .app{margin-left:var(--sidebar-width);background:var(--bg);min-height:100vh;transition:margin-left .22s ease}
.sidebar-head{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-shrink:0}
.sidebar-head .brand{min-width:0;gap:8px;font-size:14px;letter-spacing:.7px}
.sidebar-head .brand-mark{width:36px;height:38px;font-size:15px}
.sidebar-head .brand small{font-size:6px;letter-spacing:1.5px}
.sidebar-toggle{flex-shrink:0;display:grid;place-items:center;width:30px;height:32px;border:1px solid #354957;border-radius:7px;background:#1c303f;color:#c7d8e0;padding:0}
.sidebar-toggle:hover{background:#2d4655;color:var(--lime)}
.sidebar-toggle:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.sidebar-toggle svg{transition:transform .22s ease}
html .sidebar .outline{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;scrollbar-color:#405563 transparent;margin-top:0}
html:not(.sidebar-collapsed) .sidebar .workspace-label{display:block;flex-shrink:0}
html:not(.sidebar-collapsed) .sidebar .outline{display:block}
html:not(.sidebar-collapsed) .sidebar-bottom{display:block;flex-shrink:0;padding-top:20px}
html .side-link{flex-shrink:0}
html .side-link>.side-label{font-size:13px}
html.sidebar-collapsed{--sidebar-width:var(--rail-width)}
html.sidebar-collapsed .sidebar{padding:23px 10px}
.sidebar-collapsed .sidebar-head{flex-direction:column;gap:18px}
.sidebar-collapsed .brand-text,.sidebar-collapsed .workspace-label,.sidebar-collapsed .side-label,.sidebar-collapsed .tree-title,.sidebar-collapsed .sidebar-bottom,.sidebar-collapsed .side-note{display:none!important}
.sidebar-collapsed .sidebar-toggle svg{transform:rotate(180deg)}
html.sidebar-collapsed .side-link{margin-top:25px;justify-content:center;padding:10px 0}
html.sidebar-collapsed .side-link>span{font-size:23px}
html.sidebar-collapsed .outline{margin-top:18px;border-top:1px solid #2b3e4b;padding-top:12px}
.sidebar-collapsed .tree-children{padding-left:0;margin-left:0;border-left:0}
.sidebar-collapsed .tree-link{justify-content:center;padding:10px 0;margin-bottom:3px;min-height:37px}
.sidebar-collapsed .tree-symbol{font-size:20px;line-height:1;opacity:.85}
.sidebar-collapsed .tree-link.selected{box-shadow:inset 2px 0 var(--lime)}
html.sidebar-collapsed main{max-width:none}
@media(max-width:1150px){:root{--sidebar-width:210px}.sidebar-head .brand{font-size:11px}.sidebar-head .brand small{font-size:5px;letter-spacing:1px}html .sidebar{padding-left:13px;padding-right:13px}}
@media(max-width:850px){:root{--sidebar-width:190px}.sidebar-head .brand{font-size:10px}.sidebar-head .brand-mark{width:31px;height:34px}.sidebar-head .brand small{letter-spacing:.5px}.sidebar-head{gap:4px}}
@media(max-width:600px){:root{--sidebar-width:205px;--rail-width:58px}html .sidebar{padding:20px 12px}.sidebar-head .brand{font-size:12px}.sidebar-head .brand small{font-size:6px}.sidebar-collapsed .sidebar-head .brand-mark{width:32px;height:34px}html.sidebar-collapsed .sidebar{padding-left:8px;padding-right:8px}html .app main{padding-left:16px;padding-right:16px}html .topbar{padding-left:16px;padding-right:16px}.sidebar-collapsed .tree-symbol{font-size:18px}html .side-link{font-size:12px}.sidebar-collapsed .sidebar-head{gap:14px}}
@media(prefers-reduced-motion:reduce){html .sidebar,html .app,.sidebar-toggle svg{transition:none}}
.language-switch{display:flex;gap:6px;margin:0 0 22px;padding:5px;background:#eef2ec;border:1px solid var(--line);border-radius:10px;width:max-content}.language-switch a{display:block;padding:8px 15px;border-radius:7px;font-size:11px;font-weight:650;color:#687a6d}.language-switch a.selected{background:#fff;color:var(--navy);box-shadow:0 1px 4px #1730441a}.language-switch a:focus-visible,.seek-to-video:focus-visible{outline:3px solid #a6c66c;outline-offset:2px}.seek-to-video{display:inline-flex;align-items:center;gap:7px;margin:7px 0 4px;padding:7px 10px;background:#f1f6e9;border:1px solid #dbe8cb;border-radius:7px;color:#556e48;font-size:10px;font-weight:650;cursor:pointer}.seek-to-video:hover{background:#e6f0d8}.quiz-question .quiz-option{margin-top:9px}@media(max-width:600px){.language-switch{margin-bottom:18px}.language-switch a{padding:8px 12px}.seek-to-video{font-size:9px}}

.originals-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,.8fr);gap:20px;align-items:start}.original-player-panel{position:sticky;top:18px}.original-player-panel h2{font-size:20px;margin:8px 0}.original-filename{font-size:11px;color:#728275;margin:0 0 18px;overflow-wrap:anywhere}.original-player-panel video{display:block;width:100%;max-height:70vh;background:#0c1d2c;border-radius:10px}.original-source-note{border-top:1px solid var(--line);padding-top:14px;margin-top:16px;font-size:10px;color:#788779}.original-playlist{list-style:none;padding:0;margin:12px 0 0;max-height:68vh;overflow:auto}.original-playlist li{margin:0}.original-item{display:flex;width:100%;align-items:center;gap:11px;text-align:left;padding:10px 8px;border:0;border-bottom:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer}.original-item:hover,.original-item.selected{background:#f1f6e9}.original-item>span:last-child{margin-left:auto;color:#71885e}.original-item-text{display:flex;min-width:0;flex-direction:column;gap:4px}.original-item-text strong{font-size:11px;overflow-wrap:anywhere}.original-item-text small{font-size:9px;color:#7c8a7c}.original-resource{display:flex;flex-direction:column;gap:10px;border-top:1px solid var(--line);margin-top:18px;padding-top:16px;font-size:10px}.original-resource>a{display:flex;justify-content:space-between;padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:#fbfcf9;font-weight:650}.original-resource>a:hover{border-color:#b8caa5}.original-resource .message{margin:0}@media(max-width:850px){.originals-layout{grid-template-columns:1fr}.original-player-panel{position:static}.original-playlist{max-height:none}}@media(max-width:600px){.originals-layout{gap:13px}.original-player-panel h2{font-size:17px}.original-item{padding:9px 5px;gap:8px}.original-item-text strong{font-size:10px}}