/* DanceLab · Apple Human Interface style: system type, one tint, dark glass. Cards, inputs and
 * sheet rows are translucent panes; a yellow glow rises from the lower part of the screen (the top stays plain).
 * Dark by default, light via html[data-theme=light]. */
:root{
  --bg:#000;--grp:rgba(255,255,255,.09);--grp2:rgba(255,255,255,.09);--grp3:rgba(255,255,255,.14);--rim:rgba(255,255,255,.13);--sheet:rgba(24,24,27,.86);--r:12px;--r2:999px;--r-lg:14px;
  --ambient:linear-gradient(#000 0,#000 6%,transparent 22%),radial-gradient(125% 85% at 100% 30%,rgba(255,214,10,.085),transparent 75%),radial-gradient(100% 65% at 0% 100%,rgba(255,214,10,.055),transparent 72%);
  --label:#fff;--label2:rgba(235,235,245,.6);--label3:rgba(235,235,245,.3);
  --sep:rgba(84,84,88,.6);--fill:rgba(120,120,128,.24);--fill2:rgba(120,120,128,.32);
  --tint:#ffd60a;--tint-fill:#ffd60a;--tint-soft:rgba(255,214,10,.16);--on-tint:#1a1400;
  --red:#ff453a;--green:#30d158;--glass:rgba(44,44,48,.6);--glass-rim:rgba(255,255,255,.16);--glass-hi:rgba(255,255,255,.1);--elev:rgba(44,44,46,.97);--seg-on:#3a3a3c;
  --sat:env(safe-area-inset-top,0px);--sab:env(safe-area-inset-bottom,0px);--bar-gap:max(10px,calc(var(--sab) - 14px));
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","Helvetica Neue",Arial,sans-serif
}
html[data-theme=light]{
  --bg:#f2f2f7;--grp:rgba(255,255,255,.66);--grp2:rgba(255,255,255,.66);--grp3:rgba(0,0,0,.06);--rim:rgba(255,255,255,.95);--sheet:rgba(242,242,247,.9);
  --ambient:linear-gradient(#f2f2f7 0,#f2f2f7 6%,transparent 22%),radial-gradient(125% 85% at 100% 30%,rgba(255,204,0,.12),transparent 75%),radial-gradient(100% 65% at 0% 100%,rgba(255,204,0,.07),transparent 72%);
  --label:#000;--label2:rgba(60,60,67,.6);--label3:rgba(60,60,67,.3);
  --sep:rgba(60,60,67,.29);--fill:rgba(118,118,128,.12);--fill2:rgba(118,118,128,.2);
  --tint:#b58a00;--tint-fill:#ffcc00;--tint-soft:rgba(255,204,0,.2);--on-tint:#1a1400;
  --red:#ff3b30;--green:#34c759;--glass:rgba(255,255,255,.6);--glass-rim:rgba(255,255,255,.9);--glass-hi:rgba(255,255,255,.9);--elev:#fff;--seg-on:#fff
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--label);font-family:var(--font);-webkit-text-size-adjust:100%;overscroll-behavior:none;color-scheme:dark;-webkit-font-smoothing:antialiased}
html[data-theme=light]{color-scheme:light}
body{position:fixed;inset:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;-webkit-tap-highlight-color:transparent}
input,select,textarea{font:inherit;font-size:17px;color:var(--label)}
a{color:var(--tint)}
svg.i{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;display:block;flex:none}
.app{position:absolute;inset:0;max-width:560px;margin:0 auto;background:var(--ambient),var(--bg);overflow:hidden}
.screen{position:absolute;inset:0;display:none;flex-direction:column}
.screen.active{display:flex}

/* ---- navigation area ---- */
.top{padding:max(14px,calc(var(--sat) + 4px)) 16px 0;flex:none}
.top.row,.brand{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
h1{font-size:34px;font-weight:700;margin:0;letter-spacing:.37px;line-height:41px;word-break:break-word}
.top.row h1{font-size:28px;line-height:34px;letter-spacing:.36px}
.top.row.compact{justify-content:flex-end}
.top.row.compact .ib.round{margin-top:0}
.sub{font-size:15px;color:var(--label2);margin-top:0;line-height:1.35}
.ib{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;position:relative;flex:none;color:var(--tint)}
.ib.round{background:var(--fill);color:var(--label2);width:36px;height:36px;margin-top:3px}
.ib .bd{position:absolute;top:-2px;inset-inline-end:-2px;font-size:9px;font-weight:800;padding:0 4px;border-radius:6px;background:var(--label);color:var(--bg);line-height:1.5}
.ib.danger{background:var(--fill);color:var(--red)}
.ib.danger.armed,.ib.armed{background:var(--red)!important;color:#fff!important}
.searchwrap{padding:12px 16px 10px;flex:none;display:flex;gap:8px;align-items:center}
#s-library .searchwrap{padding-top:max(14px,calc(var(--sat) + 8px))}
#btn-add .i{stroke-width:2.3}
.search{flex:1;min-width:0;display:flex;gap:6px;align-items:center;background:var(--grp);border-radius:var(--r-lg);padding:7px 10px;color:var(--label2);min-height:40px}
.search .i{width:18px;height:18px;stroke-width:2.2}
.search input{border:0;outline:0;background:transparent;flex:1;min-width:0;-webkit-appearance:none;appearance:none;padding:0;margin:0}
.search input::-webkit-search-cancel-button{-webkit-appearance:none}
.fbtn{width:40px;height:40px;border-radius:var(--r-lg);background:var(--grp);color:var(--label2);display:grid;place-items:center;flex:none}
.fbtn.on{background:var(--tint-fill);color:var(--on-tint);box-shadow:none}
.fbtn .i{width:20px;height:20px;stroke-width:2}
.actf{display:flex;gap:6px;flex-wrap:wrap;padding:0 16px 10px;flex:none}
.actf button{display:flex;align-items:center;gap:4px;padding-block:5px;padding-inline:10px 8px;border-radius:var(--r2);background:var(--tint-soft);color:var(--tint);font-size:13px;font-weight:600;max-width:70%}
.actf button span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.actf .i{width:14px;height:14px;stroke-width:2.6}
.chip{flex:none;padding:6px 14px;border-radius:var(--r2);background:var(--fill);font-size:15px;font-weight:500;color:var(--label);white-space:nowrap;display:flex;align-items:center;gap:6px;border:0}
.chip.on{background:var(--tint-fill);color:var(--on-tint)}
.chip.priv:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--tint)}
.chip.priv.on:before{background:var(--on-tint)}
.chip.warn{background:var(--tint-soft);color:var(--tint)}
.chip.warn.on{background:var(--tint-fill);color:var(--on-tint)}
.scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:0 16px calc(var(--bar-gap) + 82px);overscroll-behavior:contain}
.scroll.plain{padding-bottom:calc(48px + var(--sab))}

/* ---- library list: one glass card per lesson ---- */
.month{font-size:20px;font-weight:700;color:var(--label);margin:20px 0 2px;letter-spacing:-.45px}
.scroll>.month:first-child{margin-top:4px}
.card{display:flex;gap:12px;background:var(--grp);border-radius:var(--r-lg);padding:10px;margin-top:8px;cursor:pointer;text-align:start;width:100%;color:var(--label);position:relative;border:0}
.card .chev{width:16px;height:16px;color:var(--label3);stroke-width:2.2;align-self:center;margin-inline-start:-2px}
[dir=rtl] .card .chev{transform:scaleX(-1)}
.card.untagged .thumb{outline:1.5px dashed rgba(255,214,10,.6);outline-offset:-1.5px}
.thumb{width:86px;height:86px;border-radius:8px;flex:none;position:relative;overflow:hidden;background:linear-gradient(135deg,#3a3a3c,#2c2c2e)}
.thumb.t2{background:linear-gradient(135deg,#2c3440,#1f2733)}
.thumb.t3{background:linear-gradient(135deg,#3d3629,#2b2620)}
.thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .25s}
.thumb img.ok{opacity:1}
.thumb .dur{position:absolute;inset-inline-end:5px;bottom:5px;background:rgba(0,0,0,.6);color:#fff;font-size:11px;font-weight:600;padding:2px 5px;border-radius:5px;direction:ltr;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.thumb .play{display:none}
.meta{flex:1;min-width:0;display:flex;flex-direction:column;justify-content:center;gap:3px}
.title{font-weight:500;font-size:17px;line-height:1.25;letter-spacing:-.4px;word-break:break-word;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.who{font-size:15px;color:var(--label2)}
.when{font-size:13px;color:var(--label3)}
.badges{display:flex;gap:6px;flex-wrap:wrap;margin-top:auto;align-items:center}
.tag{font-size:12px;padding:2px 8px;border-radius:6px;background:var(--fill);color:var(--label2)}
.type{font-size:12px;padding:2px 8px;border-radius:6px;font-weight:600}
.type.private{background:var(--tint-fill);color:var(--on-tint)}.type.group{background:var(--fill);color:var(--label)}
.empty{color:var(--label2);font-size:15px;line-height:1.5;padding:44px 10px;text-align:center}
.empty b{color:var(--label)}
.empty.small{padding:10px 16px;font-size:13px;text-align:start}

/* ---- tab bar: floating glass capsule (iOS 26 style) ---- */
.tabbar{position:absolute;inset-inline:16px;bottom:var(--bar-gap);height:64px;border-radius:999px;padding:0 6px;background:var(--glass);backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);box-shadow:0 10px 30px rgba(0,0,0,.3),inset 0 0 0 .5px var(--glass-rim),inset 0 1px 0 var(--glass-hi);display:flex;justify-content:space-around;align-items:center}
.tab{display:flex;flex-direction:column;align-items:center;gap:2px;font-size:10px;font-weight:500;color:var(--label2);width:96px;letter-spacing:.1px;height:100%;justify-content:center;border-radius:999px}
.tab.on{color:var(--tint)}
.tab .i{width:26px;height:26px;stroke-width:1.7}

/* ---- player (always dark: it sits on the video) ---- */
.back{position:absolute;inset-inline-start:10px;top:max(8px,calc(var(--sat) + 2px));z-index:3;width:36px;height:36px;border-radius:50%;background:rgba(0,0,0,.45);color:#fff;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
[dir=ltr] .back .i{transform:scaleX(-1)}
.topctl{position:absolute;right:8px;top:max(8px,calc(var(--sat) + 2px));z-index:3;display:flex;gap:2px;direction:ltr;transition:opacity .25s}
[dir=rtl] .topctl{right:auto;left:8px}
.tb2{position:relative;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#fff;background:rgba(0,0,0,.35);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.tb2 .i{width:19px;height:19px}
.tb2.on{background:#ffd60a;color:#1a1400}
.tb2 .bd{position:absolute;top:-2px;right:-2px;font-size:9px;font-weight:800;padding:0 4px;border-radius:6px;background:#fff;color:#000;line-height:1.5}
.tb2.on .bd{background:#1a1400;color:#ffd60a}
.tb2.speed{width:auto;min-width:40px;padding:0 8px;font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}
.speedwrap{position:relative}
.menu{position:absolute;left:50%;transform:translateX(-50%);top:calc(100% + 8px);background:rgba(44,44,46,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-radius:12px;padding:4px;display:flex;flex-direction:column;min-width:96px;box-shadow:0 12px 30px rgba(0,0,0,.45);z-index:5}
.menu button{padding:9px 14px;border-radius:8px;text-align:left;font-size:15px;font-weight:500;color:#fff;font-variant-numeric:tabular-nums}
.menu button.on{background:#ffd60a;color:#1a1400}
#s-detail.hidectl .topctl,#s-detail.hidectl .center,#s-detail.hidectl .pctl{opacity:0;pointer-events:none}
.player{position:relative;background:#000;padding-top:var(--sat);flex:none;direction:ltr}
.player:before{content:"";position:absolute;left:0;right:0;top:0;height:calc(var(--sat) + 80px);background:linear-gradient(rgba(0,0,0,.55),transparent);pointer-events:none;z-index:1}
.player video{display:block;width:100%;height:min(48vh,470px);object-fit:contain;background:#000;transition:transform .2s}
.player video.mirror{transform:scaleX(-1)}
.center{position:absolute;left:50%;top:calc(50% + var(--sat)/2);transform:translate(-50%,-50%);display:flex;align-items:center;gap:30px;transition:opacity .25s;z-index:2}
.bigplay{width:66px;height:66px;border-radius:50%;background:rgba(255,255,255,.22);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);color:#fff;display:grid;place-items:center}
.bigplay .i{width:30px;height:30px}
.skip{position:relative;width:44px;height:44px;border-radius:50%;background:rgba(0,0,0,.35);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#fff;display:grid;place-items:center}
.skip .i{width:28px;height:28px;stroke-width:1.8}
.skip b{position:absolute;left:50%;top:50%;transform:translate(-50%,-40%);font-size:9px;font-weight:700}
.vload{position:absolute;left:50%;bottom:60px;transform:translateX(-50%);background:rgba(0,0,0,.55);color:#fff;font-size:12px;font-weight:500;padding:4px 10px;border-radius:999px;z-index:2;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);white-space:nowrap;pointer-events:none}
.pctl{position:absolute;left:0;right:0;bottom:0;padding:22px 14px 8px;background:linear-gradient(transparent,rgba(0,0,0,.6));color:#fff;transition:opacity .25s;z-index:2}
.time{display:block;font-size:12px;font-weight:500;font-variant-numeric:tabular-nums;opacity:.85;margin-bottom:2px}
.scrub{position:relative;height:24px;display:flex;align-items:center;cursor:pointer;touch-action:none}
.scrub .track{position:absolute;left:0;right:0;height:4px;border-radius:2px;background:rgba(255,255,255,.3)}
.scrub .fill{position:absolute;left:0;height:4px;border-radius:2px;background:#fff;width:0}
.scrub .knob{position:absolute;width:12px;height:12px;border-radius:50%;background:#fff;margin-left:-6px;left:0;box-shadow:0 1px 3px rgba(0,0,0,.4)}
.scrub .mk{position:absolute;top:3px;width:2px;height:18px;background:#ffd60a;margin-left:-1px}
.scrub .mk:after{content:attr(data-l);position:absolute;top:-15px;left:-4px;font-size:10px;font-weight:700;color:#ffd60a}
.scrub .ab{position:absolute;height:4px;background:rgba(255,214,10,.55)}

/* ---- lesson page ---- */
.actrow{display:flex;gap:2px;padding:6px 0 0;margin:0 -6px}
.actrow .ib{color:var(--tint)}
.actrow #detail-delete{color:var(--red)}
.ib.aibtn{color:var(--tint)}
.ib.aibtn.busy{opacity:.5;pointer-events:none;animation:pulse 1.2s ease-in-out infinite}
@keyframes pulse{50%{opacity:1}}
.airow{display:flex;align-items:center;gap:10px;margin-top:12px}
.airow .ib{background:var(--tint-soft);width:36px;height:36px;flex:none}
.airow .hint{padding:0;flex:1;color:var(--tint);font-size:15px}
.hint{color:var(--label2);font-size:13px;line-height:1.45;padding:8px 16px 0}
.ttl2{font-size:22px;font-weight:700;line-height:1.25;letter-spacing:-.26px;margin:8px 0 4px;word-break:break-word}
.meta2{display:flex;gap:6px;align-items:center;flex-wrap:wrap;color:var(--label2);font-size:15px}
.dim{color:var(--label3)}
.tagrow{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.tagpick{display:flex;gap:8px;flex-wrap:wrap}
.tagpick .chip{font-size:14px;padding:6px 12px}
.desc{font-size:17px;line-height:1.45;margin-top:12px;letter-spacing:-.4px;word-break:break-word}
.desc p{margin:0 0 12px}
.desc p:last-child{margin-bottom:0}
.desc b{display:block;font-weight:600;margin-bottom:2px}
h3{font-size:13px;font-weight:400;color:var(--label2);margin:22px 16px 6px}
.chapters-empty{font-size:15px;color:var(--label2);line-height:1.45;background:var(--grp);border-radius:var(--r) var(--r) 0 0;padding:12px 14px}
.fig{display:flex;align-items:center;gap:10px;padding:11px 14px;font-size:17px;width:100%;text-align:start;color:var(--label);background:var(--grp);position:relative;cursor:pointer;letter-spacing:-.4px}
.fig+.fig:before,.chapters-empty+.fig:before{content:"";position:absolute;top:0;inset-inline-start:14px;inset-inline-end:0;height:.5px;background:var(--sep)}
h3+.fig,#f-chapters .fig:first-child{border-radius:var(--r) var(--r) 0 0}
.fig.add,#f-chapters .fig:last-child{border-radius:0 0 var(--r) var(--r)}
#f-chapters .fig:only-child{border-radius:var(--r)}
.fig .fname{flex:1;min-width:0;word-break:break-word}
.fig .tm{font-variant-numeric:tabular-nums;color:var(--tint);font-weight:500;direction:ltr;font-size:15px;flex:none}
.fig .x{width:28px;height:28px;color:var(--label3);flex:none;margin-inline-end:-6px}
.fig .x .i{width:18px;height:18px}
.fig.add{color:var(--tint);justify-content:flex-start;padding:10px 14px}
.fig.add .i{width:22px;height:22px}
.markwrap{margin:8px 0 0}
.note{font-size:17px;line-height:1.45;background:var(--grp);border-radius:var(--r);padding:12px 14px;letter-spacing:-.4px;word-break:break-word}
.note.dim{color:var(--label2)}

/* ---- forms ---- */
.form{padding:0}
.field{margin-top:14px}
.field>label,.lbl{display:block;font-size:13px;color:var(--label2);margin:0 16px 7px}
.input{background:var(--grp);border-radius:var(--r);padding:0 14px;display:flex;justify-content:space-between;align-items:center;gap:8px;min-height:44px}
.input+.input{margin-top:8px}
.input select,.input input,.input textarea{border:0;outline:0;background:transparent;flex:1;min-width:0;-webkit-appearance:none;appearance:none;padding:11px 0;margin:0;color:var(--label)}
.pickbtn{width:100%;cursor:pointer;text-align:start;padding:11px 14px;color:var(--label)}
.pickbtn .v{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pickbtn .i{width:16px;height:16px;color:var(--label3);stroke-width:2.4}
.input textarea{resize:none;height:92px;line-height:1.4}
.input input[type=date]{min-height:22px;text-align:start}
.input input[type=date]::-webkit-date-and-time-value{text-align:start}
.mini{width:30px;height:30px;border-radius:50%;background:var(--tint-fill);color:var(--on-tint);display:grid;place-items:center;flex:none}
.mini .i{width:18px;height:18px;stroke-width:2.2}
.seg{display:flex;background:var(--fill);border-radius:9px;padding:2px;gap:2px}
.seg.wrap{flex-wrap:wrap}
.seg button{flex:1 0 auto;text-align:center;padding:7px 12px;border-radius:7px;font-size:13px;font-weight:600;color:var(--label);white-space:nowrap;transition:background .15s}
.seg button.on{background:var(--seg-on);box-shadow:0 3px 8px rgba(0,0,0,.12),0 3px 1px rgba(0,0,0,.04)}
.pick{position:relative;margin-top:14px;height:120px;border-radius:var(--r);display:grid;place-items:center;color:var(--label2);font-size:15px;background:var(--grp);cursor:pointer;text-align:center;padding:0 20px;overflow:hidden}
.pick.locked{cursor:default}
.pick img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.35}
.pick .txt{position:relative;display:flex;flex-direction:column;gap:2px;align-items:center;word-break:break-all}
.pick b{color:var(--tint);font-size:17px;font-weight:600}
.pick.picked b{color:var(--label)}
.vh{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden;pointer-events:none}
.primary{margin:22px 0 0;background:var(--tint-fill);color:var(--on-tint);border-radius:var(--r);padding:14px;font-size:17px;font-weight:600;width:100%}
.primary:disabled{opacity:.55}
.progress{margin:12px 0 0;height:4px;background:var(--fill);border-radius:2px;overflow:hidden;display:none}
.progress i{display:block;height:100%;width:0;background:var(--tint);transition:width .3s}
.dangerrow{display:flex;align-items:center;gap:12px;margin-top:28px}
.dangerrow .hint{padding:0}

/* ---- schools + settings ---- */
#schools .month,#settings-body .month{font-size:13px;font-weight:400;color:var(--label2);margin:20px 16px 7px;letter-spacing:-.08px}
#schools>.month:first-child,#settings-body>.month:first-child{margin-top:10px}
.trow{display:flex;justify-content:space-between;align-items:center;background:var(--grp);padding:10px 14px;gap:10px;width:100%;text-align:start;color:var(--label);position:relative;min-height:58px}
.trow+.trow:before{content:"";position:absolute;top:0;inset-inline-start:14px;inset-inline-end:0;height:.5px;background:var(--sep)}
.month+.trow{border-radius:var(--r) var(--r) 0 0}
.trow:last-child,.trow:has(+.month){border-radius:0 0 var(--r) var(--r)}
.month+.trow:last-child,.month+.trow:has(+.month){border-radius:var(--r)}
.trow .n{font-size:17px;letter-spacing:-.4px;word-break:break-word}
.trow .s{font-size:13px;color:var(--label2);margin-top:2px}
.trow .count{font-size:13px;color:var(--label2);text-align:end;flex:none;line-height:1.4}
.trow .ib{background:transparent;color:var(--label3);width:32px;height:32px}
.srow{display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--grp);border-radius:var(--r);padding:10px 14px;min-height:44px;position:relative}
.srow .lbl2{font-size:17px;letter-spacing:-.4px}
.srow .sm{font-size:13px;color:var(--label2);margin-top:2px;overflow-wrap:break-word;line-height:1.4}
.srow .ib{color:var(--tint);width:32px;height:32px}
.srow:has(+.input){border-radius:var(--r) var(--r) 0 0}
.srow+.input{border-radius:0 0 var(--r) var(--r);position:relative;box-shadow:none}
.srow+.input:before{content:"";position:absolute;top:0;inset-inline-start:14px;inset-inline-end:0;height:.5px;background:var(--sep)}
.help{background:var(--grp);border-radius:var(--r);padding:0 14px}
.help div{display:flex;gap:12px;align-items:flex-start;padding:11px 0;border-bottom:.5px solid var(--sep);font-size:15px;line-height:1.45;color:var(--label2)}
.help div:last-child{border-bottom:0}
.help .i{width:22px;height:22px;color:var(--tint);margin-top:2px}
.help b{display:block;color:var(--label);font-weight:600;font-size:17px;letter-spacing:-.4px}
/* ---- bottom sheet (filters) ---- */
.sheetwrap{position:absolute;inset:0;z-index:20}
.sheetwrap .dim{position:absolute;inset:0;background:rgba(0,0,0,.45);opacity:0;transition:opacity .25s}
.sheetwrap.open .dim{opacity:1}
.sheet{position:absolute;inset-inline:0;bottom:0;max-height:78%;overflow-y:auto;-webkit-overflow-scrolling:touch;background:var(--sheet);backdrop-filter:blur(30px) saturate(160%);-webkit-backdrop-filter:blur(30px) saturate(160%);border-radius:22px 22px 0 0;padding:8px 16px calc(22px + var(--sab));box-shadow:0 -10px 40px rgba(0,0,0,.45);transform:translateY(100%);transition:transform .3s cubic-bezier(.2,.8,.2,1)}
.sheetwrap.open .sheet{transform:none}
.grab{width:36px;height:5px;border-radius:3px;background:var(--label3);margin:0 auto 10px}
.sheet h4{font-size:17px;font-weight:600;margin:4px 0 10px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px;text-align:center}
.sheet h4 button{font-size:15px;font-weight:600;padding:4px 0}
#sheet-reset{justify-self:start;color:var(--label2);font-weight:500}
#sheet-done{justify-self:end;color:var(--tint)}
.shead{font-size:13px;color:var(--label2);margin:14px 12px 6px}
.orows{background:var(--grp2);border-radius:var(--r);overflow:hidden}
.orow{display:flex;align-items:center;gap:10px;padding:12px;font-size:17px;width:100%;text-align:start;color:var(--label);position:relative;letter-spacing:-.4px}
.orow+.orow:before{content:"";position:absolute;top:0;inset-inline-start:12px;inset-inline-end:0;height:.5px;background:var(--sep)}
.orow .n{flex:1;min-width:0;word-break:break-word}
.orow .c{font-size:13px;color:var(--label2);font-variant-numeric:tabular-nums}
.orow .ck{width:18px;height:18px;color:var(--tint);stroke-width:2.4}
.orow .dot{width:6px;height:6px;border-radius:50%;background:var(--tint);flex:none}
.toast{position:absolute;inset-inline:20px;bottom:calc(var(--bar-gap) + 76px);background:var(--elev);color:var(--label);padding:12px 14px;border-radius:14px;font-size:15px;line-height:1.45;box-shadow:0 10px 30px rgba(0,0,0,.35);opacity:0;transform:translateY(10px);transition:all .25s;pointer-events:none;z-index:9}
.toast.show{opacity:1;transform:none}

/* ---- sign in ---- */
.auth{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:calc(var(--sat) + 24px) 32px calc(var(--sab) + 32px);overflow-y:auto}
.auth .logo{width:100px;height:100px;border-radius:23px;margin-bottom:22px;box-shadow:0 12px 32px rgba(0,0,0,.4);flex:none}
.auth h1{font-size:32px;letter-spacing:-.4px}
.auth .sub{margin-top:8px;font-size:17px;line-height:1.45}
.auth .primary{margin-top:28px}
.auth .hint{padding:16px 0 0}
.setup{margin-top:24px;background:var(--grp);border-radius:var(--r);padding:16px;font-size:15px;line-height:1.5;text-align:start;width:100%}
.setup h3{margin:0 0 6px;font-size:17px;color:var(--label);font-weight:600}
.setup p{margin:0 0 8px}
.setup ol{padding-inline-start:18px;margin:8px 0}
.setup li{margin-bottom:6px}
.setup code{background:var(--fill);padding:1px 6px;border-radius:6px;font-size:12px;word-break:break-all;direction:ltr;display:inline-block}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* audio-only lessons: waveform in place of a frame, shorter player, no mirror/fullscreen/pip */
.thumb.audio{display:grid;place-items:center}
.thumb.audio .aud{width:34px;height:34px;color:#ffd60a;stroke-width:1.9;opacity:.9}
.pick .aud{width:30px;height:30px;color:var(--tint);margin-bottom:2px}
.audioart{position:absolute;inset:var(--sat) 0 0 0;display:none;place-items:center;background:radial-gradient(circle at 50% 45%,#2c2c2e,#000 75%);z-index:0}
.audioart .i{width:72px;height:72px;color:#ffd60a;opacity:.85;stroke-width:1.6}
#s-detail.audio .audioart{display:grid}
#s-detail.audio .player video{height:min(30vh,250px)}
#s-detail.audio #btn-mirror,#s-detail.audio #btn-pip,#s-detail.audio #btn-fs{display:none}

/* attachments: strip of tiles under the notes */
h3 .cnt{color:var(--label3);margin-inline-start:4px}
.strip{display:flex;gap:8px;overflow-x:auto;padding:2px 0 6px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.strip::-webkit-scrollbar{display:none}
.tile{width:92px;height:92px;border-radius:var(--r);flex:none;position:relative;overflow:hidden;background:var(--grp);display:grid;place-items:center;color:var(--label2);font-size:11px;text-align:center;letter-spacing:-.2px}
.tile img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .25s}
.tile img.ok{opacity:1}
.tile .cap{position:absolute;inset-inline:0;bottom:0;padding:16px 6px 5px;font-size:10px;line-height:1.2;background:linear-gradient(transparent,rgba(0,0,0,.75));color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:start;opacity:0;transition:opacity .25s}
.tile img.ok+.cap{opacity:1}
.tile.doc,.tile.link{grid-template-rows:1fr auto}
.tile.doc .i,.tile.link .i{width:30px;height:30px;color:var(--tint);align-self:end;margin-bottom:6px;stroke-width:1.8}
.tile.doc span,.tile.link span{align-self:start;padding:0 6px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:92px}
.tile.add{border:1.5px dashed var(--label3);background:none;box-shadow:none;color:var(--tint)}
.tile.add .i{width:26px;height:26px;stroke-width:2.4}
.tile.busy{font-size:12px;font-weight:600;color:var(--label2);font-variant-numeric:tabular-nums;animation:pulse 1.2s ease-in-out infinite}
.orow .li{width:22px;height:22px;color:var(--tint);stroke-width:1.9;flex:none}
.orow .hint{font-size:12px;color:var(--label2);flex:none}
.orow.danger,.orow.danger .li{color:var(--red)}
.linkrow{margin:2px 0 6px}
/* collapsed how-to (Gemini key): closed by default, one tap opens the steps */
.steps{background:var(--grp);border-radius:var(--r);margin-top:8px;font-size:15px;line-height:1.45}
.steps summary{list-style:none;display:flex;align-items:center;justify-content:space-between;padding:11px 14px;cursor:pointer;color:var(--tint);font-weight:500}
.steps summary::-webkit-details-marker{display:none}
.steps summary .i{width:16px;height:16px;color:var(--label3);stroke-width:2.4;transition:transform .2s}
.steps[open] summary .i{transform:rotate(180deg)}
.steps ol{margin:0;padding:0 14px 6px;padding-inline-start:32px;color:var(--label)}
.steps li{margin-bottom:6px}
.steps p{margin:0;padding:0 14px 12px;color:var(--label2);font-size:13px}
/* full-screen image viewer */
.viewer{position:absolute;inset:0;z-index:30;background:#000;display:flex;flex-direction:column;color:#fff}
.viewer .vtop{display:flex;justify-content:space-between;align-items:center;padding:calc(var(--sat) + 6px) 10px 0}
.viewer .vbot{display:flex;justify-content:space-between;align-items:center;padding:0 10px calc(var(--sab) + 12px)}
.viewer .ib{color:#fff}
.viewer .ib.danger{background:none;color:#ff453a}
.viewer .ib.danger.armed{background:var(--red)!important;color:#fff!important}
.viewer .vn{font-size:13px;color:rgba(235,235,245,.6);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 8px;flex:1;text-align:center}
.viewer .vimg{flex:1;min-height:0;position:relative;display:grid;place-items:center;overflow:hidden;touch-action:pan-y;margin:8px 0}
.viewer .vimg img{max-width:100%;max-height:100%;object-fit:contain;display:block;transition:opacity .2s}
.viewer .vload{bottom:16px}

/* one icon tile to pick a video or a recording (the accept list names extensions too: iOS Files greys out audio otherwise) */
.pick2{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;height:104px;margin-top:14px;border-radius:var(--r);background:var(--grp);color:var(--label2);font-size:13px;font-weight:500;cursor:pointer}
.pick2 .icons{display:flex;gap:14px}
.pick2 .i{width:32px;height:32px;stroke-width:1.6;color:var(--tint)}