:root{--bg: #f5f5f7;--card: #ffffff;--ink: #1d1d1f;--muted: #6e6e73;--line: #d2d2d7;--blue: #0071e3;--blue-soft: rgba(0, 113, 227, .12);--ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;--reading: "Noto Serif SC", "Songti SC", "Source Han Serif SC", serif;--ug: "Noto Naskh Arabic", "Geeza Pro", serif;--shadow: 0 18px 50px rgba(0, 0, 0, .06);--safe-bottom: env(safe-area-inset-bottom);color:var(--ink);background:var(--bg);font-family:var(--ui);font-size:17px;line-height:1.45}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;background:var(--bg)}button,input{font:inherit;color:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}:focus-visible{outline:2px solid var(--ink);outline-offset:3px}::selection{background:var(--blue-soft)}.boot,.login{min-height:100dvh;display:grid;place-items:center;padding:32px 20px}.login-card,.sheet,.panel{background:var(--card);border-radius:28px;box-shadow:var(--shadow)}.login-card{width:min(420px,100%);padding:36px 28px 28px}.mark{width:36px;height:6px;background:var(--ink);border-radius:99px;margin-bottom:22px}h1,h2,h3,p{margin:0}h1{font-size:40px;letter-spacing:-.04em;font-weight:650}h2{font-size:28px;letter-spacing:-.03em;font-weight:640}.lede,.muted{color:var(--muted)}.lede{margin-top:8px}.stack{display:flex;flex-direction:column;gap:12px;margin-top:28px}label{display:grid;gap:6px;font-size:13px;color:var(--muted)}input,textarea{width:100%;border:1px solid transparent;background:var(--bg);border-radius:14px;padding:14px 16px}textarea{min-height:88px;resize:vertical}input:focus,textarea:focus{border-color:var(--ink);outline:none;background:#fff}.btn,.btn-quiet,.btn-line{border:0;border-radius:999px;padding:12px 18px;background:var(--ink);color:#fff}.btn-quiet{background:transparent;color:var(--ink)}.btn-line{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1px var(--line)}.btn:disabled{opacity:.45;cursor:default}.error{color:#9b2c2c;font-size:14px}.shell{min-height:100dvh;display:grid;grid-template-columns:1fr;grid-template-areas:"stage" "tabs"}.nav{display:none;grid-area:nav}.list{display:none;grid-area:list}.stage{grid-area:stage;min-width:0;padding:max(28px,env(safe-area-inset-top)) 20px calc(128px + var(--safe-bottom))}.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:5;display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:8px 12px calc(8px + var(--safe-bottom));background:#f5f5f7eb;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-top:1px solid rgba(210,210,215,.7)}.tabbar a,.nav a,.course-link,.album-link{display:block}.tabbar a{text-align:center;padding:8px 4px 6px;border-radius:12px;color:var(--muted);font-size:12px}.tabbar a.active{color:var(--ink);font-weight:650}.shell[data-pane=album]{grid-template-areas:"list" "tabs"}.shell[data-pane=album] .list{display:block;padding:max(12px,env(safe-area-inset-top)) 12px calc(88px + var(--safe-bottom))}.shell[data-pane=album] .stage{display:none}.nav-label{margin:18px 12px 6px;color:var(--muted);font-size:12px}.wide-hint{display:none}@media(min-width:760px){.shell{grid-template-columns:232px 1fr;grid-template-areas:"nav stage"}.shell[data-pane=album]{grid-template-areas:"nav stage"}.shell[data-pane=album] .stage{display:block}.shell[data-pane=album] .list{display:none}.nav{display:flex;flex-direction:column;gap:4px;padding:max(28px,env(safe-area-inset-top)) 16px 28px;border-right:1px solid var(--line);min-height:100dvh;position:sticky;top:0}.nav a{padding:10px 12px;border-radius:12px;color:var(--ink)}.nav a.active,.nav a:hover{background:#fff}.tabbar,.phone-back{display:none}.stage{padding:max(40px,env(safe-area-inset-top)) 48px 96px}}@media(min-width:1100px){.shell[data-pane=album],.shell[data-pane=lesson]{grid-template-columns:232px 340px 1fr;grid-template-areas:"nav list stage"}.shell[data-pane=album] .list,.shell[data-pane=lesson] .list{display:block;border-right:1px solid var(--line);min-height:100dvh;max-height:100dvh;overflow:auto;padding:20px 12px 32px;position:sticky;top:0}.stage{padding:max(36px,env(safe-area-inset-top)) 56px 96px}.course-list-inline{display:none}.wide-hint{display:block;margin-top:12px}}.hero{max-width:760px}.section{margin-top:36px}.section h2{font-size:22px;margin-bottom:14px}.cards{display:grid;gap:12px}.card{background:var(--card);border-radius:22px;padding:18px 18px 16px;box-shadow:var(--shadow)}.card strong{display:block;font-size:18px;letter-spacing:-.02em}.meta{margin-top:6px;color:var(--muted);font-size:13px}.bar{margin-top:14px;height:3px;background:#e4e4e8;border-radius:99px;overflow:hidden}.bar span{display:block;height:100%;background:var(--blue)}.course-link,.album-link{padding:12px;border-radius:16px}.course-link.active,.album-link.active,.course-link:hover,.album-link:hover{background:#fff}.course-link strong,.album-link strong{font-weight:600}.row-top{display:flex;justify-content:space-between;gap:12px;align-items:baseline}.phone-back{margin-bottom:16px;padding:0;border:0;background:none;color:var(--muted)}.lesson{max-width:740px;margin:0 auto}.lesson-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.lesson-head .btn-line{flex:none;white-space:nowrap}@media(max-width:759px){.lesson-head{flex-direction:column;align-items:flex-start}.lesson h1{font-size:32px}}.segment{display:inline-flex;padding:3px;background:#fff;border-radius:999px;margin:18px 0}.segment button{border:0;background:transparent;border-radius:999px;padding:8px 16px}.segment button.on{background:var(--ink);color:#fff}.article{font-family:var(--reading);font-size:21px;line-height:1.75;font-weight:500}.article.ug{font-family:var(--ug);direction:rtl;text-align:right;font-size:22px;line-height:1.9}.article h3{font-size:28px;margin:8px 0 18px;letter-spacing:-.03em}.article p{margin:0 0 1.15em}.article img{width:100%;border-radius:18px;margin:8px 0 18px}.article mark{background:linear-gradient(transparent 62%,#0071e32e 62%);color:inherit}.cues{display:grid;gap:8px;margin-top:8px}.cue{text-align:left;border:0;background:transparent;border-radius:14px;padding:10px 12px;color:var(--muted)}.cue.on{background:var(--blue-soft);color:var(--ink)}.player{position:sticky;bottom:calc(56px + var(--safe-bottom));z-index:4;margin-top:22px;background:#ffffffeb;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-radius:20px;padding:12px;box-shadow:var(--shadow);display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center}.player video{width:100%;border-radius:16px}.player audio{display:none}.player.video{grid-template-columns:1fr}.play{min-width:64px;height:44px;padding:0 14px;border-radius:999px;border:0;background:var(--ink);color:#fff;white-space:nowrap;line-height:1;flex:none}.media-error{grid-column:1 / -1;margin:0}.scrub{width:100%;accent-color:var(--blue)}.time{color:var(--muted);font-variant-numeric:tabular-nums;font-size:13px}.tools{position:fixed;z-index:40;display:flex;gap:6px;padding:6px;background:var(--ink);color:#fff;border-radius:999px;box-shadow:var(--shadow);transform:translate(-50%);max-width:calc(100vw - 16px)}.tools button{border:0;background:transparent;color:#fff;padding:8px 10px;white-space:nowrap}.sheet-back{position:fixed;inset:0;background:#00000047;display:grid;align-items:end;z-index:50;padding:16px 16px calc(16px + env(safe-area-inset-bottom));overflow:auto;overscroll-behavior:contain}.sheet{width:min(560px,100%);margin:0 auto;padding:22px;max-height:min(70dvh,calc(100dvh - 48px - env(safe-area-inset-bottom)));overflow:auto;overscroll-behavior:contain}.sheet p{margin-top:12px;white-space:pre-wrap;font-family:var(--reading);line-height:1.7}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.install{margin-top:28px;padding:18px;border-radius:22px;background:#fff}.install ol{margin:10px 0 0;padding-left:18px;color:var(--muted)}.admin-grid{display:grid;gap:18px}.checkboxes{display:flex;flex-wrap:wrap;gap:8px}.checkboxes label{display:flex;gap:8px;align-items:center;background:var(--bg);border-radius:999px;padding:8px 12px;color:var(--ink)}.user-row{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:12px 0;border-top:1px solid var(--line)}@media(min-width:760px){.player{bottom:24px}.sheet-back{align-items:center}}.stage:has(.lesson.has-player){height:100dvh;max-height:100dvh;overflow:hidden;display:flex;flex-direction:column;padding-bottom:calc(68px + var(--safe-bottom))}.lesson.has-player{flex:1;min-height:0;display:flex;flex-direction:column;width:100%}.lesson.has-player .lesson-scroll{flex:1;min-height:0;overflow:auto;padding-bottom:16px}.lesson.has-player .player{position:static;bottom:auto;margin:8px 0 0;flex:none}.notice{color:var(--ink);font-size:15px}@media(min-width:760px){.stage:has(.lesson.has-player){padding-bottom:24px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}