:root{
  --ink:#121C3B; --ink2:#3F4A68; --muted:#58627D;
  --page:#EEF1F5; --sheet:#FFFFFF; --rule:#D8DEE8; --rule2:#E6EAF0;
  --pen:#2446C7; --pen-deep:#1A3597; --pen-soft:#E7ECFB;
  --amber:#F5C84C; --amber-soft:#FCF1CF;
  --alarm:#C23A30; --alarm-soft:#FAE3E0;
  --night:#0E1631; --night2:#18234A; --night-rule:#26325C; --night-text:#C9D1EC;
  --display:'Bricolage Grotesque','Arial Narrow',system-ui,sans-serif;
  --ui:'Instrument Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --nav-h:68px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{background:var(--page);color:var(--ink);font-family:var(--ui);font-size:16px;line-height:1.5;
  padding-bottom:calc(var(--nav-h) + env(safe-area-inset-bottom) + 12px);transition:background .3s}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;padding:0}
a{color:var(--pen)}
:focus-visible{outline:2.5px solid var(--pen);outline-offset:2px;border-radius:6px}

/* ---------------- header ---------------- */
header{position:sticky;top:0;z-index:20;background:var(--page);display:flex;align-items:center;
  padding:calc(12px + env(safe-area-inset-top)) 20px 12px;transition:background .3s,color .3s}
.mark{display:flex;align-items:center;gap:9px;font-family:var(--display);font-weight:700;font-size:19px;
  letter-spacing:-.02em;font-variation-settings:"wdth" 90}
.mark svg{width:22px;height:22px}
.mark img{width:26px;height:26px;border-radius:6px}
.hdr-day{margin-left:auto;font-size:13.5px;color:var(--muted)}
.hdr-day b{color:var(--ink);font-weight:600}
body.night{background:var(--night);color:#fff}
body.night header{background:var(--night);color:#fff}
body.night .hdr-day{color:var(--night-text)}
body.night .hdr-day b{color:#fff}

main{padding:4px 20px 20px;max-width:760px;margin:0 auto}
.view{display:none}
.view.on{display:block}

/* ---------------- shared type ---------------- */
.h-display{font-family:var(--display);font-weight:700;letter-spacing:-.025em;line-height:1.02;
  font-variation-settings:"wdth" 88,"opsz" 72;margin:0}
.h-sec{font-family:var(--display);font-weight:650;font-size:19px;letter-spacing:-.015em;margin:0 0 10px;
  font-variation-settings:"wdth" 92}
.muted{color:var(--muted)}
.small{font-size:13.5px}

/* ---------------- buttons ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;
  padding:14px 20px;font-weight:600;font-size:15px;background:var(--pen);color:#fff;transition:background .15s}
.btn:hover{background:var(--pen-deep)}
.btn.block{width:100%}
.btn.quiet{background:var(--sheet);color:var(--ink);box-shadow:inset 0 0 0 1px var(--rule)}
.btn.quiet:hover{background:var(--rule2)}
.btn.sm{padding:10px 16px;font-size:14.5px;border-radius:11px;min-height:44px}
.btn[disabled]{opacity:.45;pointer-events:none}

/* ================= TODAY ================= */
.wk-head{padding:14px 0 18px}
.wk-head .wk{font-size:14px;color:var(--muted);margin-bottom:6px}
.wk-head h1{font-size:clamp(34px,9vw,48px)}
.wk-head p{margin:10px 0 0;color:var(--ink2);font-size:15px;max-width:52ch}

/* study chart: 26 weeks x 7 days, like a medication chart */
.chart{background:var(--sheet);border-radius:18px;padding:18px 16px 14px;box-shadow:0 1px 0 var(--rule)}
.chart-grid{display:flex;gap:3px}
.chart-grid .col{display:grid;grid-template-rows:repeat(7,1fr);gap:3px;flex:1;min-width:0}
.chart-grid .col.gap{margin-left:7px}
.chart-grid .col.cur{outline:1.5px solid var(--pen);outline-offset:3px;border-radius:4px}
.c{aspect-ratio:1;border-radius:3px;background:var(--rule2);position:relative}
.c.past{background:#DCE1EA}
.c.on{background:var(--pen)}
.c.today{background:var(--sheet);box-shadow:inset 0 0 0 2px var(--ink)}
.c.today.on{background:var(--pen);box-shadow:inset 0 0 0 2px var(--ink)}
.c.mock::after{content:"";position:absolute;right:0;top:0;width:0;height:0;
  border-top:6px solid var(--alarm);border-left:6px solid transparent;border-top-right-radius:3px}
.chart-foot{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 16px;margin-top:14px}
.chart-foot .day{font-family:var(--display);font-weight:700;font-size:22px;letter-spacing:-.02em;
  font-variation-settings:"wdth" 90;margin-right:auto}
.chart-foot .day span{font-family:var(--ui);font-weight:400;font-size:14px;color:var(--muted);letter-spacing:0}
.key{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted)}
.key i{width:10px;height:10px;border-radius:2px;display:inline-block;background:var(--pen)}
.key i.t{background:var(--sheet);box-shadow:inset 0 0 0 1.5px var(--ink)}
.key i.m{background:var(--rule2);position:relative;overflow:hidden}
.key i.m::after{content:"";position:absolute;right:0;top:0;border-top:6px solid var(--alarm);border-left:6px solid transparent}
.phases{display:flex;gap:3px;margin-top:8px;font-size:12px;color:var(--muted)}
.phases span{border-top:1.5px solid var(--rule);padding-top:4px}
@keyframes ink{from{transform:scale(.3);opacity:0}to{transform:scale(1);opacity:1}}
.chart.animate .c.on{animation:ink .35s cubic-bezier(.2,.8,.3,1.2) both}

/* today's orders */
.orders{margin-top:30px}
.order{display:flex;align-items:center;gap:14px;padding:15px 2px;border-top:1px solid var(--rule)}
.order:last-child{border-bottom:1px solid var(--rule)}
.tick{width:26px;height:26px;flex:none}
.order .what{flex:1;min-width:0}
.order .what b{display:block;font-weight:600;font-size:15.5px}
.order .what span{font-size:13.5px;color:var(--muted)}
.order.done .what b{color:var(--muted)}
.order.mockday .what b{color:var(--alarm)}

/* accordions */
.accs{margin-top:30px}
details.acc{border-top:1px solid var(--rule)}
details.acc:last-child{border-bottom:1px solid var(--rule)}
details.acc>summary{list-style:none;display:flex;align-items:center;gap:12px;padding:17px 2px;cursor:pointer}
details.acc>summary::-webkit-details-marker{display:none}
details.acc>summary b{font-weight:600;font-size:15.5px}
details.acc>summary span{color:var(--muted);font-size:13.5px;margin-left:auto;text-align:right}
details.acc>summary svg{width:16px;height:16px;flex:none;color:var(--muted);transition:transform .2s}
details.acc[open]>summary svg{transform:rotate(180deg)}
details.acc .inner{padding:0 2px 22px}

.phase-h{font-family:var(--display);font-weight:650;font-size:16.5px;margin:18px 0 2px;
  font-variation-settings:"wdth" 92;letter-spacing:-.01em}
.phase-h:first-child{margin-top:4px}
.phase-n{font-size:13px;color:var(--muted);margin-bottom:6px}
.wrow{display:grid;grid-template-columns:30px 1fr;gap:4px 10px;padding:10px 0;border-top:1px solid var(--rule2)}
.wrow .n{font-family:var(--display);font-weight:600;font-size:15px;color:var(--muted);padding-top:1px;
  font-variation-settings:"wdth" 85}
.wrow b{font-weight:600;font-size:14.5px}
.wrow p{margin:1px 0 0;font-size:13px;color:var(--muted);line-height:1.45}
.wrow.now{background:var(--pen-soft);margin:0 -10px;padding:10px;border-radius:10px;border-top-color:transparent}
.wrow.now .n,.wrow.now b{color:var(--pen)}
.wrow.past b{color:var(--muted);font-weight:500}
.wrow .mock{color:var(--alarm);font-size:12.5px;font-weight:500}

.field{display:flex;align-items:center;gap:12px;margin:12px 0}
.field label{font-size:14px;color:var(--ink2);width:100px;flex:none}
.field input{flex:1;font:inherit;font-size:14.5px;padding:10px 12px;border:1px solid var(--rule);border-radius:10px;
  background:var(--sheet);color:var(--ink);min-width:0}
.set-p{font-size:14px;color:var(--ink2);margin:20px 0 0}
.set-p:first-child{margin-top:0}
.row-btns{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}

/* ================= CARDS (focus mode) ================= */
.cards-top{display:flex;align-items:center;gap:14px;padding:6px 0 18px}
.cards-top .count{font-size:14px;color:var(--night-text);white-space:nowrap}
.cards-top .count b{color:#fff;font-weight:600}
.meter{flex:1;height:5px;background:var(--night-rule);border-radius:99px;overflow:hidden}
.meter i{display:block;height:100%;background:#7F97FF;border-radius:99px;transition:width .4s}

.stage{perspective:1600px}
.flip{position:relative;min-height:min(62vh,440px);transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.2,.75,.25,1);cursor:pointer}
.flip.turned{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:20px;padding:24px 24px 22px;display:flex;flex-direction:column;background:var(--sheet);color:var(--ink);
  box-shadow:0 30px 60px -30px rgba(0,0,0,.6)}

.face.front::before{content:"";position:absolute;left:0;right:0;top:58px;height:1.5px;background:#EBB5AF}
.face.front::after{content:"";position:absolute;left:0;right:0;top:61px;height:1px;background:#F3D6D2}
.face.back{transform:rotateY(180deg);background:var(--pen-soft)}
.face .top{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted);min-height:26px}
.face .q{font-family:var(--display);font-weight:600;font-size:clamp(23px,5.6vw,29px);line-height:1.22;
  letter-spacing:-.015em;font-variation-settings:"wdth" 94,"opsz" 36;margin:auto 0;padding:22px 0}
.face .a{font-family:var(--display);font-weight:500;font-size:clamp(21px,5vw,25px);line-height:1.35;letter-spacing:-.01em;margin:auto 0;padding:22px 0;color:var(--ink);font-variation-settings:"wdth" 96,"opsz" 30}
.face .foot{font-size:13px;color:var(--muted)}
.face.back .foot{color:var(--pen)}
.hint{text-align:center;font-size:13.5px;color:var(--night-text);margin:16px 0 14px;min-height:20px}
.rate{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.rate button{border-radius:14px;padding:14px 6px 12px;font-weight:600;font-size:15.5px;line-height:1.2;transition:transform .1s}
.rate button:active{transform:scale(.97)}
.rate button small{display:block;font-weight:400;font-size:12px;margin-top:3px;opacity:.85}
.rate .missed{background:var(--alarm);color:#fff}
.rate .shaky{background:var(--amber);color:var(--ink)}
.rate .solid{background:#fff;color:var(--pen)}
.rate[hidden]{display:none}
.undo{display:block;margin:-6px auto 12px;color:var(--night-text);font-size:13.5px;text-decoration:underline;min-height:44px;padding:0 12px}

.night-empty{padding:40px 6px 10px}
.night-empty h2{font-size:clamp(28px,7vw,38px);color:#fff}
.night-empty p{color:var(--night-text);font-size:15.5px;margin:12px 0 26px;max-width:40ch}
.night-empty .btn.quiet{background:transparent;color:#fff;box-shadow:inset 0 0 0 1px var(--night-rule)}
.loading{display:flex;align-items:center;gap:12px;color:var(--night-text);padding:40px 0}
.spin{width:18px;height:18px;border:2px solid var(--night-rule);border-top-color:#7F97FF;border-radius:50%;animation:sp .8s linear infinite;flex:none}
.view:not(#v-cards) .spin{border-color:var(--rule);border-top-color:var(--pen)}
.view:not(#v-cards) .loading{color:var(--ink2)}
@keyframes sp{to{transform:rotate(360deg)}}
.note{border-radius:12px;padding:12px 14px;font-size:14px;margin-bottom:16px;background:var(--alarm-soft);color:#8E2A22}
#v-cards .note{background:rgba(217,65,54,.16);color:#FFC7C1}

/* ================= QUIZ ================= */
.quiz-home h1{font-size:clamp(32px,8vw,44px);margin:14px 0 10px}
.quiz-home>p{color:var(--ink2);margin:0 0 26px;max-width:50ch}
.paper{display:flex;align-items:center;gap:16px;background:var(--sheet);border-radius:16px;padding:18px;
  margin-bottom:10px;width:100%;text-align:left;box-shadow:0 1px 0 var(--rule);transition:box-shadow .15s}
.paper:hover{box-shadow:0 0 0 1.5px var(--pen)}
.paper .num{font-family:var(--display);font-weight:700;font-size:34px;line-height:1;width:52px;flex:none;
  color:var(--pen);font-variation-settings:"wdth" 85;letter-spacing:-.03em}
.paper.mock .num{color:var(--alarm)}
.paper b{display:block;font-size:16px;font-weight:600}
.paper span{font-size:13.5px;color:var(--muted)}
.next-mock{margin-top:22px;padding:16px 0;border-top:1px solid var(--rule);font-size:14.5px;color:var(--ink2)}
.next-mock b{color:var(--alarm);font-weight:600}

.qmeta{display:flex;justify-content:space-between;font-size:13.5px;color:var(--muted);padding:12px 0 6px}
.endq{color:var(--muted);font-size:13.5px;text-decoration:underline;min-height:44px;margin:-12px -6px -12px 0;padding:0 6px}
.qmeta{align-items:center}
.qbar{height:4px;background:var(--rule);border-radius:99px;overflow:hidden;margin-bottom:22px}
.qbar i{display:block;height:100%;background:var(--pen)}
.stem{font-size:18px;line-height:1.55;margin:0 0 22px;max-width:62ch}
.opt{display:flex;gap:13px;align-items:flex-start;width:100%;text-align:left;background:var(--sheet);border-radius:13px;
  padding:14px 15px;margin-bottom:9px;font-size:15.5px;line-height:1.45;box-shadow:inset 0 0 0 1px var(--rule)}
.opt .l{width:26px;height:26px;border-radius:50%;flex:none;display:grid;place-items:center;font-weight:600;font-size:13px;
  background:var(--rule2);color:var(--ink2);margin-top:-1px}
.opt:hover:not([disabled]){box-shadow:inset 0 0 0 1.5px var(--pen)}
.opt.right{background:var(--pen-soft);box-shadow:inset 0 0 0 1.5px var(--pen)}
.opt.right .l{background:var(--pen);color:#fff}
.opt.wrong{background:var(--alarm-soft);box-shadow:inset 0 0 0 1.5px var(--alarm)}
.opt.wrong .l{background:var(--alarm);color:#fff}
.opt[disabled]{cursor:default}
.why{border-left:3px solid var(--pen);padding:4px 0 4px 16px;margin:18px 0 22px;font-size:15px;color:var(--ink2);line-height:1.55}
.why b{color:var(--ink)}

.result h1{font-size:clamp(64px,18vw,96px);margin:10px 0 0;color:var(--pen)}
.result h1 small{font-size:.38em;color:var(--muted);font-weight:500;letter-spacing:0}
.result .verdict{font-size:16px;color:var(--ink2);margin:10px 0 26px;max-width:46ch}

/* ================= PROGRESS (observation chart) ================= */
.stats{display:grid;grid-template-columns:repeat(3,1fr);margin:14px 0 30px;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.stat{padding:16px 12px 14px;border-left:1px solid var(--rule)}
.stat:first-child{border-left:none;padding-left:2px}
.stat b{display:block;font-family:var(--display);font-weight:700;font-size:clamp(28px,7vw,38px);line-height:1;
  letter-spacing:-.03em;font-variation-settings:"wdth" 88}
.stat span{display:block;font-size:12.5px;color:var(--muted);margin-top:6px}

.obs{background:var(--sheet);border-radius:18px;padding:18px 16px 8px;margin-bottom:26px;box-shadow:0 1px 0 var(--rule)}
.obs-scale{display:flex;font-size:12px;color:var(--muted);margin:0 0 6px}
.orow{padding:11px 0 12px;border-top:1px solid var(--rule2)}
.orow .lab{display:flex;justify-content:space-between;gap:10px;font-size:14px;margin-bottom:7px}
.orow .lab span{color:var(--muted);font-size:13px;white-space:nowrap}
.band{position:relative;height:14px;border-radius:4px;display:flex;overflow:visible}
.band i{height:100%}
.band .r{background:var(--alarm-soft);border-radius:4px 0 0 4px;width:50%}
.band .y{background:var(--amber-soft);width:25%}
.band .w{background:#F6F8FB;border-radius:0 4px 4px 0;width:25%;box-shadow:inset 0 0 0 1px var(--rule2)}
.band .dot{position:absolute;top:50%;width:16px;height:16px;margin:-8px 0 0 -8px;border-radius:50%;
  background:var(--pen);box-shadow:0 0 0 3px #fff}
.band.none .dot{display:none}
.trend{width:100%;height:auto;display:block}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--muted);margin:10px 0 12px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:6px;vertical-align:-1px}
.log{display:flex;justify-content:space-between;padding:13px 2px;border-top:1px solid var(--rule);font-size:14.5px}
.log:last-child{border-bottom:1px solid var(--rule)}
.log b{font-weight:600}
.log .mk{color:var(--alarm);font-weight:500}
.log span{color:var(--muted);font-size:13.5px}

/* ================= LIBRARY ================= */
.lib-g{font-family:var(--display);font-weight:650;font-size:17px;margin:30px 0 4px;font-variation-settings:"wdth" 92}
.lib-g:first-of-type{margin-top:16px}
.res{display:block;padding:14px 2px;border-top:1px solid var(--rule);text-decoration:none;color:var(--ink)}
.res b{font-weight:600;font-size:15.5px;color:var(--pen)}
.res p{margin:3px 0 0;font-size:14px;color:var(--ink2);line-height:1.5}

/* ================= sheets ================= */
.scrim{position:fixed;inset:0;background:rgba(14,22,49,.55);z-index:60;display:flex;align-items:flex-end;justify-content:center;
  animation:fade .2s ease}
.sheet{background:var(--sheet);width:100%;max-width:720px;border-radius:22px 22px 0 0;max-height:90vh;overflow:auto;
  padding:10px 22px calc(26px + env(safe-area-inset-bottom));animation:up .32s cubic-bezier(.2,.8,.25,1)}
.grab{width:40px;height:4px;border-radius:99px;background:var(--rule);margin:4px auto 18px}
.sheet-foot{position:sticky;bottom:calc(-26px - env(safe-area-inset-bottom));background:var(--sheet);margin:0 -22px calc(-26px - env(safe-area-inset-bottom));padding:14px 22px calc(18px + env(safe-area-inset-bottom));box-shadow:0 -1px 0 var(--rule2);display:flex;gap:10px}
.sheet-foot .btn{flex:1}
.sheet h2{font-size:clamp(28px,7vw,36px);margin:0 0 6px}
.sheet .lead{color:var(--muted);font-size:14.5px;margin:0 0 22px}
.sheet dl{margin:0 0 24px}
.sheet dt{font-weight:600;font-size:15.5px;margin-top:18px}
.sheet dd{margin:4px 0 0;color:var(--ink2);font-size:14.5px;line-height:1.6}
.lesson h3{font-family:var(--display);font-weight:650;font-size:19px;margin:28px 0 8px;letter-spacing:-.01em;
  font-variation-settings:"wdth" 92}
.lesson h3:first-child{margin-top:4px}
.lesson p{margin:0 0 12px;font-size:16px;line-height:1.68;color:var(--ink2);max-width:64ch}
.lesson h3.aus{color:var(--pen)}
.lesson h3.trap{color:var(--alarm)}
@keyframes up{from{transform:translateY(40px);opacity:.4}to{transform:none;opacity:1}}
@keyframes fade{from{opacity:0}to{opacity:1}}

/* ================= nav ================= */
nav{position:fixed;left:0;right:0;bottom:0;z-index:40;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);border-top:1px solid var(--rule);display:flex;
  padding:6px 6px calc(6px + env(safe-area-inset-bottom))}
nav button{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;padding:7px 2px;border-radius:12px;
  font-size:12px;color:var(--muted);font-weight:500}
nav button svg{width:23px;height:23px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
nav button.on{color:var(--pen)}
nav button.on svg{stroke-width:2.1}
nav .brand{display:none}


.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.tags span{font-size:13px;color:var(--ink2);background:var(--sheet);border-radius:8px;padding:5px 10px;box-shadow:inset 0 0 0 1px var(--rule)}
.chart-grid .col.daylab{flex:0 0 11px;margin-right:3px;font-size:10px;color:var(--muted)}
.daylab span{display:flex;align-items:center;justify-content:center;line-height:1}
.chart-keys{display:flex;gap:14px;margin-top:8px}
.order.na .what b{color:var(--muted);font-weight:500}
.help-row{display:grid;grid-template-columns:38px 1fr;gap:4px 14px;padding:13px 0;border-top:1px solid var(--rule2);align-items:start}
.help-row:first-child{border-top:none;padding-top:4px}
.help-row .ic{width:38px;height:38px;border-radius:11px;background:var(--pen-soft);display:grid;place-items:center;grid-row:span 2}
.help-row .ic svg{width:21px;height:21px;fill:none;stroke:var(--pen);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.help-row b{font-weight:600;font-size:15.5px}
.help-row p{margin:0;font-size:14px;color:var(--ink2);line-height:1.5}
.ratekey{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin:8px 0 2px}
.ratekey span{border-radius:10px;padding:8px 6px;text-align:center;font-size:13px;font-weight:600;line-height:1.25}
.ratekey small{display:block;font-weight:400;font-size:12px;opacity:.9}
.ratekey .m{background:var(--alarm);color:#fff}
.ratekey .s{background:var(--amber);color:var(--ink)}
.ratekey .g{background:var(--pen-soft);color:var(--pen);box-shadow:inset 0 0 0 1px #C8D3F5}
.band.none{background:repeating-linear-gradient(90deg,var(--rule2) 0 6px,transparent 6px 10px);height:6px;margin:4px 0}
.band.none i{display:none}
body.night nav{background:rgba(24,35,74,.96);border-top-color:var(--night-rule)}
body.night nav button{color:#8A95BD}
body.night nav button.on{color:#9CB0FF}

.res .look{color:var(--ink);font-size:13.5px;font-weight:500;margin:4px 0 0;padding-left:10px;border-left:2px solid var(--pen)}
.tagpdf{font-size:11px;font-weight:600;color:var(--muted);background:var(--rule2);border-radius:5px;padding:1px 6px;margin-left:4px;vertical-align:2px}
.tgnote{background:var(--pen-soft);border-radius:16px;padding:16px 18px}
.tgnote b{font-weight:600;font-size:15.5px}
.tgnote p{margin:4px 0 0;font-size:14px;color:var(--ink2);line-height:1.5}
.res.paid .price{display:block;font-size:13px;color:var(--alarm);font-weight:500;margin-top:2px}
.res.paid b{color:var(--ink)}

.tags.lessons button{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--ink);background:var(--sheet);border-radius:11px;padding:9px 13px 9px 10px;box-shadow:inset 0 0 0 1px var(--rule);min-height:44px;text-align:left}
.tags.lessons button:hover{box-shadow:inset 0 0 0 1.5px var(--pen)}
.tags.lessons button i{font-style:normal;width:21px;height:21px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:600;background:var(--rule2);color:var(--ink2);flex:none}
.tags.lessons button.read{color:var(--ink2)}
.tags.lessons button svg{flex:none}
.nextlesson{display:block;width:100%;text-align:left;padding:14px 0;margin:6px 0 4px;border-top:1px solid var(--rule2);color:var(--pen);font-weight:600;font-size:15px;min-height:44px}

.setbar{display:flex;gap:8px;overflow-x:auto;margin:0 -20px 16px;padding:2px 20px 4px;scrollbar-width:none}
.setbar::-webkit-scrollbar{display:none}
.setbar button{flex:none;display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;column-gap:9px;align-items:center;text-align:left;
  background:var(--night2);border-radius:13px;padding:9px 14px 9px 10px;min-height:52px;max-width:230px;box-shadow:inset 0 0 0 1px var(--night-rule);color:#fff}
.setbar .sn{grid-row:span 2;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font-size:12.5px;font-weight:600;background:var(--night-rule);color:#fff}
.setbar .st{font-size:13.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.setbar .sc{font-size:12px;color:var(--night-text)}
.setbar button.on{box-shadow:inset 0 0 0 2px #9CB0FF;background:#22306A}
.setbar button.full .sn{background:#7F97FF;color:var(--night)}
.face .rv{font-weight:600;color:var(--pen);background:var(--pen-soft);border-radius:6px;padding:1px 7px;margin-right:4px}
.linkbtn{display:block;margin-top:18px;color:var(--night-text);text-decoration:underline;font-size:14px;min-height:44px}
.night-empty .row-btns{margin-top:4px}
.night-empty .row-btns .btn.quiet{background:transparent;color:#fff;box-shadow:inset 0 0 0 1px var(--night-rule)}
.drillrow{display:flex;justify-content:space-between;align-items:center;width:100%;padding:14px 2px;border-top:1px solid var(--rule2);min-height:52px;text-align:left}
.drillrow b{font-weight:600;font-size:15.5px}
.drillrow span{color:var(--muted);font-size:13.5px}
.readbar{position:sticky;top:-10px;height:3px;background:var(--rule2);margin:-10px -22px 16px;z-index:2}
.readbar i{display:block;height:100%;width:0;background:var(--pen);transition:width .1s}
.lesson ul,.lesson ol{margin:0 0 14px;padding-left:22px;color:var(--ink2)}
.lesson li{font-size:16px;line-height:1.6;margin-bottom:6px;max-width:62ch}
.lesson h3.chk{color:var(--ink)}
.qa{border:1px solid var(--rule);border-radius:12px;margin:0 0 10px;background:var(--page)}
.qa summary{list-style:none;cursor:pointer;padding:13px 15px;font-weight:600;font-size:15px;line-height:1.45;color:var(--ink)}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"Tap to see the answer";display:block;font-weight:400;font-size:12.5px;color:var(--pen);margin-top:4px}
.qa[open] summary::after{content:"Answer"}
.qa p{margin:0;padding:0 15px 14px;font-size:15px;line-height:1.6;color:var(--ink2)}

.c.chk::after{content:"";position:absolute;right:0;top:0;width:0;height:0;border-top:6px solid var(--amber);border-left:6px solid transparent;border-top-right-radius:3px}
.key i.m.k::after{border-top-color:var(--amber)}
.mock.chkc,.mk.chkc{color:#8A6400}
.paper.due{box-shadow:0 0 0 2px var(--alarm);}
.paper.due .num{color:var(--alarm)}
.paper[disabled]{opacity:.55;cursor:default}
.examline{display:flex;justify-content:space-between;font-size:14px;font-weight:600;margin:-2px 0 8px}
.examline .pace{font-weight:500;color:var(--pen)}
.examline .pace.behind{color:var(--alarm)}
.qa.rv summary{font-weight:500;font-size:14.5px}
.qa.rv summary::after{content:"Tap to see the answer"}
@media (min-width:900px){
  body.night nav{background:var(--night2);border-right-color:var(--night-rule)}
  body.night nav button:hover{background:var(--night)}
  main{max-width:880px}
}
@media (min-width:900px){
  body{padding-bottom:30px;padding-left:108px}
  nav{top:0;bottom:0;right:auto;width:108px;flex-direction:column;justify-content:flex-start;gap:4px;
    border-top:none;border-right:1px solid var(--rule);padding:22px 10px;background:var(--sheet)}
  nav button{flex:none;padding:12px 4px;font-size:12.5px}
  nav button:hover{background:var(--page)}
  nav .brand{display:flex;justify-content:center;margin-bottom:22px}
  nav .brand svg{width:30px;height:30px}
  nav .brand img{border-radius:8px}
  header .mark{display:none}
  header{padding-left:32px;padding-right:32px}
  main{padding:4px 32px 40px}
  .scrim{align-items:center}
  .sheet{border-radius:22px;max-height:84vh}
  .grab{display:none}
  .sheet{padding-top:30px}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}