/* ThunderStudy Study: clay UI kit (blue light, purple dark). Theme is only ever set by the toggle. */
:root{
  color-scheme:light;
  --canvas:#F4F1FC;--canvas-deep:#ECE6FB;--surface:#FAF8FE;
  --ink:#2B2640;--body-c:#5C5575;--muted:#6B6485;
  --hairline:rgba(43,38,64,.08);--hairline-strong:rgba(43,38,64,.16);
  --primary:#2563EB;--primary-active:#1D4ED8;--primary-soft:#DBE8FF;--on-primary:#fff;
  --success:#22c55e;--warning:#f59e0b;--error:#dc2626;
  --clay-light:rgba(255,255,255,.9);--clay-dark:rgba(120,108,180,.5);--scrim:rgba(26,23,48,.55);
  --radius-card:28px;--radius-lg:24px;--radius-md:20px;--radius-sm:16px;--radius-pill:999px;
  --font:'Inter',system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --e-sm:4px 4px 10px var(--clay-dark),-4px -4px 10px var(--clay-light);
  --e-md:6px 6px 14px var(--clay-dark),-6px -6px 14px var(--clay-light);
  --e-lg:10px 10px 24px var(--clay-dark),-10px -10px 24px var(--clay-light);
  --e-pressed:inset 4px 4px 10px var(--clay-dark),inset -4px -4px 10px var(--clay-light);
  --ease-out:cubic-bezier(.2,.8,.2,1);
  --purple:#D9CCFF;--purple-ink:#3E2A9E;--blue:#C7DDFF;--blue-ink:#1F4FA3;--green:#C6F0D3;--green-ink:#1B6B3A;
  --red:#FFCFCF;--red-ink:#A12626;--yellow:#FFF0A8;--yellow-ink:#7A5C00;--pink:#FFCFE6;--pink-ink:#9E2A68;
  --orange:#FFD9B8;--orange-ink:#A34A0B;--teal:#BDF0EA;--teal-ink:#0F6A63;--cyan:#BDEBFF;--cyan-ink:#0B6180;
}
[data-theme="dark"]{
  color-scheme:dark;
  --canvas:#1A1730;--canvas-deep:#15122A;--surface:#221D3C;
  --ink:#F1EEFB;--body-c:#C7C0E0;--muted:#8E86AC;
  --hairline:rgba(255,255,255,.08);--hairline-strong:rgba(255,255,255,.16);
  --primary:#9A7AFB;--primary-active:#B196FB;--primary-soft:#2E2650;--on-primary:#1A1730;
  --clay-light:rgba(255,255,255,.05);--clay-dark:rgba(0,0,0,.55);
  --purple:#3B2F75;--purple-ink:#E3DAFF;--blue:#26427A;--blue-ink:#D6E6FF;--green:#1F5A36;--green-ink:#D3F6DF;
  --red:#7A2A2A;--red-ink:#FFDADA;--yellow:#6B5A1A;--yellow-ink:#FFF2B8;--pink:#7A2F58;--pink-ink:#FFDAEE;
  --orange:#7A4220;--orange-ink:#FFE2CB;--teal:#1D5A56;--teal-ink:#CCF6F1;--cyan:#1C5670;--cyan-ink:#CDF1FF;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:92px;overflow-x:clip}
html,body{margin:0;padding:0;min-height:100%}
body{font-family:var(--font);background:var(--canvas);color:var(--body-c);-webkit-font-smoothing:antialiased;overflow-x:clip;padding-bottom:calc(96px + env(safe-area-inset-bottom,0px));transition:background .3s ease,color .3s ease}
a{text-decoration:none;color:inherit}
button{font-family:var(--font);border:none;background:none;cursor:pointer;color:inherit}
h1,h2,h3,h4,h5,h6,p{margin:0}
svg{flex-shrink:0}
[hidden]{display:none!important}
.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
.narrow{max-width:820px}
@media(max-width:640px){.wrap{padding:0 20px}}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:2px solid var(--primary);outline-offset:3px}
.skip{position:absolute;left:12px;top:-60px;z-index:999;background:var(--primary);color:var(--on-primary);padding:10px 16px;border-radius:12px;font-weight:700}
.skip:focus{top:12px}

/* hero */
.hero{position:relative;overflow:hidden;padding:64px 0 34px;text-align:center}
.blob{position:absolute;border-radius:50%;filter:blur(36px);opacity:.7;pointer-events:none;z-index:0}
.blob-1{width:360px;height:360px;background:radial-gradient(circle at 35% 35%,var(--purple),transparent 70%);top:-140px;left:-120px}
.blob-2{width:300px;height:300px;background:radial-gradient(circle at 60% 40%,var(--blue),transparent 70%);top:20px;right:-100px}
.hero .wrap{position:relative;z-index:1}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:var(--radius-pill);background:var(--c,var(--primary-soft));color:var(--k,var(--primary));font-size:12px;font-weight:700;letter-spacing:1.3px;text-transform:uppercase}
.hero-badge svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.hero h1{margin:20px auto 0;max-width:820px;font-size:clamp(30px,5.4vw,52px);line-height:1.08;font-weight:700;letter-spacing:-.4px;color:var(--ink)}
.accent{color:var(--primary)}
.hero-sub{margin:16px auto 0;max-width:640px;font-size:17.5px;line-height:1.6;color:var(--body-c)}
.powered{display:inline-flex;align-items:center;gap:8px;margin-top:20px;padding:8px 16px;border-radius:99px;background:var(--surface);box-shadow:var(--e-sm);font-size:13px;font-weight:700;color:var(--ink)}
.powered svg{width:18px;height:18px;fill:none;stroke:var(--primary);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
[data-theme="dark"] .powered svg{stroke:var(--primary-active)}

/* sections */
.sec{padding:72px 0}
.sec-alt{background:var(--canvas-deep)}
.sec-tool{padding:20px 0 56px}
.sec-head{max-width:680px;margin:0 auto 36px;text-align:center}
.sec-kicker{display:inline-block;font-size:12px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--primary);background:var(--primary-soft);padding:6px 14px;border-radius:var(--radius-pill);margin-bottom:14px}
[data-theme="dark"] .sec-kicker{color:var(--primary-active)}
.sec-head h2{font-size:clamp(24px,4vw,34px);line-height:1.15;font-weight:700;letter-spacing:-.4px;color:var(--ink)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
@media(max-width:800px){.grid-3{grid-template-columns:minmax(0,1fr)}}
.card{background:var(--surface);border-radius:var(--radius-lg);padding:26px 24px;box-shadow:var(--e-md)}
.card-ico{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:var(--c);color:var(--k);margin-bottom:14px}
.card-ico svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:18px;color:var(--ink);margin-bottom:8px}
.card p{font-size:14.5px;line-height:1.6;color:var(--muted)}
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--surface);border-radius:20px;box-shadow:var(--e-sm);overflow:hidden}
.faq-item summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;font-size:16px;font-weight:700;color:var(--ink)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-chev{flex:none;width:30px;height:30px;border-radius:50%;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;transition:transform .25s ease}
.faq-chev svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.faq-item[open] .faq-chev{transform:rotate(180deg);background:var(--primary);color:var(--on-primary)}
.faq-item p{padding:0 22px 20px;font-size:15px;line-height:1.65;color:var(--muted)}

/* buttons */
.btn{min-height:46px;padding:0 24px;border-radius:var(--radius-pill);display:inline-flex;align-items:center;justify-content:center;gap:9px;font-size:15px;font-weight:600;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease}
.btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn-primary{background:var(--primary);color:var(--on-primary);box-shadow:var(--e-md)}
.btn-primary:hover{background:var(--primary-active);transform:translateY(-3px)}
.btn-primary:active,.btn-secondary:active,.btn-outline:active,.btn-soft:active{transform:scale(.95)}
.btn-secondary{background:var(--surface);color:var(--ink);box-shadow:var(--e-md)}
.btn-secondary:hover{color:var(--primary);transform:translateY(-3px)}
.btn-outline{background:transparent;color:var(--ink);border:1px solid var(--hairline-strong)}
.btn-outline:hover{color:var(--primary);border-color:var(--primary)}
.btn-soft{background:var(--primary-soft);color:var(--primary)}
[data-theme="dark"] .btn-soft{color:var(--primary-active)}
.btn:disabled{background:var(--primary-soft);color:var(--muted);box-shadow:none;transform:none;cursor:not-allowed}
.btn-sm{min-height:44px;padding:0 18px;font-size:14px}
.btn-lg{min-height:56px;padding:0 34px;font-size:16px;font-weight:700}
.btn-block{width:100%}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* panel + inputs */
.panel{background:var(--surface);border-radius:var(--radius-card);padding:34px;box-shadow:var(--e-lg)}
@media(max-width:640px){.panel{padding:24px 18px}}
.field-label{display:block;font-size:12px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.hint{font-size:13.5px;color:var(--muted);margin-top:10px;line-height:1.5}
.hint.err{color:var(--error)}.hint.ok{color:var(--success)}
[data-theme="dark"] .hint.err{color:#f87171}
.input-wrap{position:relative}
.input-wrap>svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:20px;height:20px;stroke:var(--muted);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.text-input{width:100%;font-family:var(--font);font-size:16px;color:var(--ink);background:var(--canvas-deep);border:1.5px solid var(--hairline-strong);border-radius:var(--radius-md);height:58px;padding:0 20px;transition:border-color .2s,box-shadow .2s}
.input-wrap .text-input{padding-left:52px}
.text-input.shadowed{box-shadow:inset 3px 3px 8px var(--clay-dark),inset -3px -3px 8px var(--clay-light)}
[data-theme="dark"] .text-input.shadowed{box-shadow:none}
.text-input::placeholder{color:var(--muted);font-weight:300}
.text-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
textarea.text-input{height:auto;min-height:200px;padding:18px 20px;line-height:1.6;resize:vertical;font-size:15.5px}
.row-inline{display:flex;gap:14px;align-items:center}
.row-inline .text-input{flex:1;min-width:0}
@media(max-width:640px){.row-inline{flex-wrap:wrap}.row-inline .btn{flex:1 1 100%}}
.paste-meta{display:flex;align-items:center;gap:12px;margin-top:12px}
.paste-bar{flex:1;height:6px;border-radius:999px;background:var(--canvas-deep);overflow:hidden;box-shadow:inset 1px 1px 3px var(--clay-dark)}
.paste-bar i{display:block;height:100%;width:0;background:var(--primary);border-radius:999px;transition:width .2s ease}
.paste-count{font-size:12.5px;font-weight:600;color:var(--muted);text-align:right}
.src-wrap{margin-top:22px}
.ctx{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
@media(max-width:640px){.ctx{grid-template-columns:minmax(0,1fr)}}
.ctx .text-input{height:50px;font-size:15px}
.ctx label{display:block;font-size:12px;font-weight:600;color:var(--muted);margin-bottom:6px}
.opt-block{margin-top:26px}

/* file drop */
.file-drop{display:flex;flex-direction:column;align-items:center;gap:6px;padding:34px 20px 28px;text-align:center;border:2px dashed var(--hairline-strong);border-radius:var(--radius-lg);background:var(--canvas);color:var(--muted);box-shadow:var(--e-pressed);transition:border-color .2s,background .2s,transform .2s;cursor:pointer;user-select:none;-webkit-tap-highlight-color:transparent}
[data-theme="dark"] .file-drop{box-shadow:none;background:var(--canvas-deep)}
.file-drop:hover,.file-drop.dragover{border-color:var(--primary);background:var(--primary-soft)}
.file-drop.dragover{transform:scale(1.015)}
.fd-icon{width:60px;height:60px;border-radius:50%;background:var(--c,var(--primary-soft));color:var(--k,var(--primary));display:flex;align-items:center;justify-content:center;margin-bottom:6px;transition:transform .25s ease}
.fd-icon svg{width:28px;height:28px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.file-drop:hover .fd-icon{transform:translateY(-3px)}
.fd-title{font-size:17px;font-weight:700;color:var(--ink)}
.fd-sub{font-size:14px;color:var(--body-c)}
.fd-btn{margin-top:10px;display:inline-flex;align-items:center;padding:10px 22px;border-radius:var(--radius-pill);background:var(--primary);color:var(--on-primary);font-size:14px;font-weight:700;box-shadow:var(--e-sm)}
.fd-meta{font-size:12px;color:var(--muted);margin-top:4px}
.fname{margin-top:10px;padding:7px 14px;border-radius:var(--radius-pill);background:var(--surface);color:var(--ink);font-size:13px;font-weight:600;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;box-shadow:var(--e-sm)}
.fname:empty{display:none}
.file-input{display:none}

/* voice */
.voice-box{display:flex;align-items:center;gap:18px;padding:18px;border-radius:var(--radius-lg);background:var(--canvas);box-shadow:var(--e-pressed)}
[data-theme="dark"] .voice-box{box-shadow:none;background:var(--canvas-deep)}
.rec-btn{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;background:var(--pink);color:var(--pink-ink);box-shadow:var(--e-md);transition:transform .2s,background .2s;position:relative}
.rec-btn svg{width:30px;height:30px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.rec-btn:active{transform:scale(.92)}
.rec-btn[aria-pressed="true"]{background:var(--error);color:#fff;animation:recPulse 1.3s infinite}
@keyframes recPulse{0%{box-shadow:var(--e-md),0 0 0 0 rgba(220,38,38,.45)}100%{box-shadow:var(--e-md),0 0 0 18px transparent}}
.voice-box b{display:block;color:var(--ink);font-size:16px}
.voice-box span.t{font-variant-numeric:tabular-nums;color:var(--muted);font-size:14px}
.or{display:flex;align-items:center;gap:14px;margin:22px 0;color:var(--muted);font-size:12px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--hairline-strong)}

/* tabs, segmented toggle, chips */
.tabs{display:flex;gap:6px;padding:6px;border-radius:99px;background:var(--canvas-deep);box-shadow:var(--e-pressed);margin-bottom:26px}
[data-theme="dark"] .tabs{box-shadow:none}
.tab{flex:1;min-height:44px;padding:0 14px;border-radius:99px;font-size:14px;font-weight:700;color:var(--muted);transition:background .2s,color .2s}
.tab[aria-selected="true"]{background:var(--primary);color:var(--on-primary);box-shadow:var(--e-sm)}
.mode-pane{display:none}.mode-pane.active{display:block;animation:paneIn .3s ease}
@keyframes paneIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.depth-seg{display:flex;align-items:center;gap:4px;width:max-content;max-width:100%;padding:8px;border-radius:999px;background:var(--surface);box-shadow:inset 3px 3px 8px var(--clay-dark),inset -3px -3px 8px var(--clay-light),6px 6px 16px var(--clay-dark),-6px -6px 16px var(--clay-light)}
[data-theme="dark"] .depth-seg{box-shadow:0 8px 22px rgba(0,0,0,.45)}
.depth-chip{display:flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 24px;border-radius:999px;color:var(--muted);font-size:15px;font-weight:700;transition:background .25s,color .25s,box-shadow .25s}
.depth-chip small{font-size:11.5px;font-weight:600;opacity:.85}
.depth-chip svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.depth-chip.active{background:var(--primary);color:var(--on-primary);box-shadow:5px 5px 12px var(--clay-dark),-3px -3px 8px var(--clay-light)}
.depth-chip:active{transform:scale(.97)}
@media(max-width:420px){.depth-chip{padding:0 16px;gap:6px}.depth-chip small{display:none}}
.chip-row{display:flex;flex-wrap:wrap;gap:12px}
.tchip{position:relative;cursor:pointer}
.tchip input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.tchip span{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 18px 0 12px;border-radius:var(--radius-pill);background:var(--surface);color:var(--ink);font-size:14px;font-weight:600;border:1.5px solid transparent;box-shadow:var(--e-sm);transition:transform .2s,background .2s,color .2s}
.tchip i{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--c);color:var(--k)}
.tchip i svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.tchip:hover span{transform:translateY(-2px)}
.tchip input:checked+span{background:var(--primary-soft);border-color:var(--primary);color:var(--primary)}
[data-theme="dark"] .tchip input:checked+span{color:var(--primary-active)}
.tchip input:focus-visible+span{outline:2px solid var(--primary);outline-offset:3px}

/* generate + status */
.panel-foot{display:flex;flex-direction:column;gap:14px;margin-top:30px}
.progress{height:8px;border-radius:999px;background:var(--canvas-deep);overflow:hidden;box-shadow:inset 1px 1px 3px var(--clay-dark)}
.progress i{display:block;height:100%;width:0;background:var(--primary);border-radius:999px;transition:width .3s ease}
#status{margin:0;min-height:20px}
.est{font-size:13px;color:var(--muted);margin-top:8px}
textarea.lines{min-height:160px}

/* result */
.result{margin-top:34px;scroll-margin-top:90px}
.result-head{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.result-head h2{font-size:24px;color:var(--ink)}
.sheet{background:var(--surface);border-radius:var(--radius-card);padding:30px;box-shadow:var(--e-md);color:var(--body-c);font-size:15.5px;line-height:1.65;overflow-wrap:anywhere}
@media(max-width:640px){.sheet{padding:22px 16px}}
.sheet .pack-title{font-size:26px;line-height:1.2;color:var(--ink);margin:30px 0 4px;padding-bottom:10px;border-bottom:2px solid var(--primary-soft)}
.sheet .pack-title:first-child{margin-top:0}
.sheet .type-title{display:inline-block;margin:24px 0 10px;padding:6px 16px;border-radius:99px;background:var(--c,var(--primary-soft));color:var(--k,var(--primary));font-size:13px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;break-after:avoid}
.sheet h4{color:var(--ink);font-size:18px;margin:20px 0 6px;break-after:avoid}
.sheet h5{color:var(--ink);font-size:15.5px;margin:18px 0 6px;padding:6px 12px;background:var(--canvas-deep);border-radius:10px;break-after:avoid}
.sheet h6{color:var(--ink);font-size:15px;margin:14px 0 4px}
.sheet p{margin:8px 0}
.sheet ul,.sheet ol{margin:8px 0;padding-left:22px}
.sheet li{margin:4px 0}
.sheet strong{color:var(--ink)}
.sheet code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13.5px;background:var(--canvas-deep);padding:2px 6px;border-radius:6px}
.sheet blockquote{margin:10px 0;padding:10px 16px;border-left:4px solid var(--primary);background:var(--canvas-deep);border-radius:0 12px 12px 0}
.sheet hr{border:0;height:1px;background:var(--hairline-strong);margin:18px 0}
.sheet table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14.5px}
.sheet th,.sheet td{border:1px solid var(--hairline-strong);padding:8px 10px;text-align:left;vertical-align:top}
.sheet th{background:var(--primary-soft);color:var(--ink)}
.sheet tr{break-inside:avoid}
.sheet .tbl{overflow-x:auto}
.sheet-foot{margin-top:28px;padding-top:14px;border-top:1px solid var(--hairline-strong);font-size:12.5px;color:var(--muted)}
.pdf-doc{--ink:#2B2640;--body-c:#3d3856;--muted:#6B6485;--surface:#fff;--canvas-deep:#F1EEFB;--primary:#2563EB;--primary-soft:#E4DEFF;--hairline-strong:#d9d3ee;--purple:#D9CCFF;--purple-ink:#3E2A9E;--blue:#C7DDFF;--blue-ink:#1F4FA3;--green:#C6F0D3;--green-ink:#1B6B3A;--red:#FFCFCF;--red-ink:#A12626;--orange:#FFD9B8;--orange-ink:#A34A0B;--teal:#BDF0EA;--teal-ink:#0F6A63;--pink:#FFCFE6;--pink-ink:#9E2A68;background:#fff;color:#3d3856;font-family:var(--font);padding:0}
.pdf-doc .sheet{box-shadow:none;border-radius:0;padding:0;font-size:13px;line-height:1.55;background:#fff}
.pdf-doc .pdf-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;padding-bottom:10px;border-bottom:3px solid #573AFC;font-size:12px;color:#6B6485}
.pdf-doc .pdf-top b{font-size:16px;color:#2B2640}

.toast{position:fixed;left:50%;bottom:calc(110px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);z-index:300;padding:10px 18px;border-radius:var(--radius-pill);background:var(--ink);color:var(--canvas);font-size:13px;font-weight:700;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;max-width:calc(100vw - 32px);text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
@media print{
  .nav,.dock,.hero,.panel,.result-head,.sec,footer.wmf,.toast,.mobile-menu,.skip{display:none!important}
  body{background:#fff;padding:0}.sec-tool{padding:0;display:block!important}
  .sheet{--ink:#2B2640;--body-c:#3d3856;--surface:#fff;--canvas-deep:#F1EEFB;--primary-soft:#DBE8FF;--hairline-strong:#d9d3ee;box-shadow:none;background:#fff;padding:0}
}

/* voice orb (from the UI kit) */
.stage{text-align:center;padding:36px 20px}.orb{--lv:0;width:180px;height:180px;margin:44px auto 58px;position:relative;border-radius:50%;background:radial-gradient(circle at 30% 22%,#fff 0,transparent 38%),radial-gradient(circle at 72% 72%,var(--pink) 0,transparent 55%),radial-gradient(circle at 25% 75%,var(--cyan) 0,transparent 55%),radial-gradient(circle at 75% 25%,var(--purple) 0,transparent 55%),var(--blue);background-size:180% 180%;box-shadow:var(--e-lg),0 0 calc(24px + var(--lv)*70px) color-mix(in srgb,var(--blue) 70%,transparent);transform:scale(calc(1 + var(--lv)*.3));transition:transform .08s linear;animation:orbM 7s ease-in-out infinite,orbF 5s ease-in-out infinite,orbS 9s ease-in-out infinite}
.orb.live{animation-duration:3.5s,2.5s,4s}.orb::before,.orb::after{content:"";position:absolute;inset:0;border-radius:inherit;border:2px solid var(--blue-ink);opacity:0;animation:orbR 2.8s ease-out infinite}.orb::after{animation-delay:1.4s}
@keyframes orbM{0%,100%{border-radius:50%}25%{border-radius:58% 42% 46% 54%/48% 56% 44% 52%}50%{border-radius:44% 56% 58% 42%/56% 44% 56% 44%}75%{border-radius:52% 48% 40% 60%/42% 58% 42% 58%}}
@keyframes orbF{50%{translate:0 -14px}}@keyframes orbS{50%{background-position:100% 100%}}@keyframes orbR{from{opacity:.55;transform:scale(1)}to{opacity:0;transform:scale(1.55)}}
.orb-wrap{text-align:center}.orb-wrap .btn{margin-top:4px}.orb-time{display:block;font-variant-numeric:tabular-nums;color:var(--muted);font-size:14px;margin-top:6px}.orb-wrap .stage{padding:8px 20px 4px}.orb-wrap #recLabel{display:block;color:var(--ink);font-weight:700;font-size:16px}
@media(prefers-reduced-motion:reduce){.orb,.orb::before,.orb::after{animation:none!important;transition:none!important}}

/* ===== header, mobile menu, footer: copied from the UI kit ===== */
.nav{ position:sticky; top:0; z-index:50; background:var(--canvas); border-bottom:1px solid var(--hairline); backdrop-filter:blur(16px) saturate(160%); }
.nav .wrap{ display:flex; align-items:center; justify-content:space-between; height:76px; }
.brand{ display:flex; align-items:center; gap:10px; font-weight:700; font-size:16px; color:var(--ink); }
.brand-text{ display:flex; flex-direction:column; line-height:1.15; }
.brand-name{ color:var(--ink); font-size:17px; font-weight:700; letter-spacing:-.2px; }
.brand-accent{ color:var(--primary); }
.brand-by{ color:var(--muted); font-size:11.5px; font-weight:400; letter-spacing:.1px; }
.brand-mark{ width:36px; height:36px; border-radius:12px; background:none; display:flex; align-items:center; justify-content:center; box-shadow:none; }
.brand-mark img{ width:32px; height:32px; }
.nav-right{ display:flex; align-items:center; gap:12px; }
.theme-btn{ width:44px; height:44px; border-radius:14px; background:var(--surface); display:flex; align-items:center; justify-content:center; color:var(--ink); box-shadow: 4px 4px 10px var(--clay-dark), -4px -4px 10px var(--clay-light); transition:transform .2s ease; }
.theme-btn:hover{ transform:translateY(-2px); }
.theme-btn svg{ width:18px; height:18px; }
.nav-cta{ display:inline-flex; align-items:center; justify-content:center; height:44px; padding:0 18px; border-radius:var(--radius-pill); background:var(--primary); color:var(--on-primary); font-size:14px; font-weight:600; box-shadow: 4px 4px 10px var(--clay-dark), -4px -4px 10px var(--clay-light); transition:transform .2s ease,background .2s ease; }
.nav-cta:hover{ background:var(--primary-active); transform:translateY(-2px); }
.nav-request{ display:inline-flex; align-items:center; justify-content:center; gap:8px; width:44px; height:44px; padding:0; border-radius:14px; background:var(--surface); color:var(--ink); font-size:14px; font-weight:600; white-space:nowrap; box-shadow: 4px 4px 10px var(--clay-dark), -4px -4px 10px var(--clay-light); transition:transform .2s ease,color .2s ease; }
.nav-request:hover{ color:var(--primary); transform:translateY(-2px); }
.nav-request svg{ width:17px; height:17px; flex-shrink:0; }
/* header, small screens: Contact shows as an icon */
@media(max-width:640px){.nav .wrap{height:68px}.nav-right{gap:8px}.nav-cta{display:none}.nav-request{width:44px;padding:0;border-radius:14px}.nav-request-text{display:none}}
@media(max-width:400px){.nav .wrap{padding:0 14px}
.nav-right{gap:6px}
.theme-btn,.nav-request{width:44px;height:44px}
}
/* header page links + mobile menu (same tokens as the kit header) */
.nav-icons{display:flex;align-items:center;gap:inherit}
.ham-btn{display:none;width:44px;height:44px;border-radius:14px;background:var(--surface);color:var(--ink);align-items:center;justify-content:center;box-shadow:4px 4px 10px var(--clay-dark),-4px -4px 10px var(--clay-light)}
.mobile-menu{display:none;flex-direction:column;position:fixed;top:76px;left:0;right:0;z-index:49;background:var(--canvas);border-bottom:1px solid var(--hairline);padding:0 20px;max-height:0;overflow:hidden;transition:max-height .25s ease,padding .25s ease}
.mobile-menu.open{max-height:80vh;overflow-y:auto;padding:8px 20px 20px}
.mobile-menu{transition:max-height .25s ease,padding .25s ease,visibility 0s}.mobile-menu:not(.open){border-bottom-width:0;visibility:hidden;transition:max-height .25s ease,padding .25s ease,visibility 0s .25s}
.mobile-menu a{font-size:15px;font-weight:600;color:var(--ink);padding:14px 4px;border-bottom:1px solid var(--hairline)}
.mobile-menu a.active{color:var(--primary)}
.mobile-menu a:last-child{border-bottom:none}
/* header: Home, FAQ and New are icon buttons on the right at every width; the 3-line button holds everything else */
.ham-btn{display:flex}
.mobile-menu{display:flex}
@media(min-width:1100px){.mobile-menu{left:auto;right:20px;width:260px;border:1px solid var(--hairline);border-radius:var(--radius-card);box-shadow:var(--e-lg)}
.mobile-menu:not(.open){border-color:transparent;box-shadow:none}
}
@media(max-width:640px){.mobile-menu{top:68px}
.brand-by{display:none}
.nav-home{display:none}
}
@media(max-width:520px){.brand-text{display:none}
}
@media(max-width:400px){.ham-btn{width:44px;height:44px}
.brand-name{font-size:15px}
.brand-by{font-size:10.5px}

}
/* hamburger -> X */
.ham-icon path{transform-box:fill-box;transform-origin:center;transition:transform .25s ease,opacity .2s ease}
.ham-btn[aria-expanded="true"] .ham-top{transform:translateY(6px) rotate(45deg)}
.ham-btn[aria-expanded="true"] .ham-mid{opacity:0;transform:scaleX(0)}
.ham-btn[aria-expanded="true"] .ham-bot{transform:translateY(-6px) rotate(-45deg)}
.nav{transition:transform .35s var(--ease-out)}.nav.up{transform:translateY(-100%)}
/* theme toggle: icons morph (rotate + scale + fade), page reveals in a circle from the button */
.theme-btn{position:relative;overflow:hidden}
.theme-btn svg{position:absolute;inset:0;margin:auto;transition:transform .55s cubic-bezier(.2,.8,.2,1),opacity .3s ease}
#themeIconSun{opacity:1;transform:rotate(0) scale(1)}
#themeIconMoon{opacity:0;transform:rotate(-90deg) scale(.3)}
[data-theme="dark"] #themeIconSun{opacity:0;transform:rotate(90deg) scale(.3)}
[data-theme="dark"] #themeIconMoon{opacity:1;transform:rotate(0) scale(1)}
.theme-btn:active{transform:translateY(0) scale(.92)}
::view-transition-old(root),::view-transition-new(root){animation:none;mix-blend-mode:normal}
::view-transition-old(root){z-index:1}
::view-transition-new(root){z-index:2}
html.theme-swap *{transition:none!important}
@media(prefers-reduced-motion:reduce){.theme-btn svg{transition:none}
}


/* header v3: glass bar, buttons depend on screen size */
.nav{-webkit-backdrop-filter:blur(16px) saturate(1.5);backdrop-filter:blur(16px) saturate(1.5);background:color-mix(in srgb,var(--canvas) 80%,transparent);border-bottom:1px solid var(--hairline);box-shadow:0 8px 24px -16px var(--clay-dark)}
.nav-right{gap:10px}
.nav-request,.theme-btn,.ham-btn{transition:transform .2s var(--ease-out),color .2s,box-shadow .2s,background .2s}
.nav-request:active,.theme-btn:active,.ham-btn:active{transform:scale(.92)}
.nav-request:focus-visible,.theme-btn:focus-visible,.ham-btn:focus-visible{outline:2px solid var(--primary);outline-offset:3px}
.nav-request[aria-current="page"]{background:var(--primary-soft);color:var(--primary)}
.mm{display:none;align-items:center;gap:12px}
.mm svg{width:20px;height:20px;flex:none;color:var(--primary)}
/* PC, 1024 and up: everything, with labels */
@media(min-width:1024px){
 .nav-request{width:auto;padding:0 16px 0 14px;gap:8px}
 .nav-request::after{content:attr(title);font-size:14px;font-weight:700}
 .nav-request svg{width:18px;height:18px}
}
/* tablet, 640 to 1023: New, Contact, light and dark, menu */
@media(max-width:1023px){.nav-home,.nav-faq{display:none}.mm-home,.mm-faq{display:flex}}
/* phone: three boxes: New, light and dark, menu */
@media(max-width:639px){.nav-contact{display:none}.mm-contact{display:flex}}
/* smallest phones: only light and dark, plus the menu */
@media(max-width:359px){.nav-new{display:none}.mm-new{display:flex}.nav .wrap{padding:0 12px}.nav-right{gap:8px}}

footer.wmf{--f-surface:#FAF8FE;--f-canvas:#F4F1FC;--f-ink:#2B2640;--f-body:#5C5575;--f-muted:#6B6485;--f-hair:rgba(43,38,64,.08);--f-primary:#573AFC;display:block;position:relative;float:none;clear:both;width:auto;max-width:none;margin:0;padding:64px 0 0;text-align:left;background:var(--f-surface);border:0;border-top:1px solid var(--f-hair);border-radius:0;overflow:visible;color:var(--f-muted);font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;font-size:16px;font-weight:400;line-height:1.5;letter-spacing:normal;text-transform:none}
[data-theme="dark"] footer.wmf{--f-surface:#221D3C;--f-canvas:#1A1730;--f-ink:#F1EEFB;--f-body:#C7C0E0;--f-muted:#8E86AC;--f-hair:rgba(255,255,255,.08);--f-primary:#9A7AFB}
footer.wmf,footer.wmf *,footer.wmf *::before,footer.wmf *::after{box-sizing:border-box}
footer.wmf .wmf-wrap{max-width:1240px;margin:0 auto;padding:0 32px}
footer.wmf .wmf-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px 48px;padding:0 0 48px;margin:0}
footer.wmf a{text-decoration:none;background:none;box-shadow:none}
footer.wmf .wmf-brand{display:inline-flex;align-items:center;gap:12px;color:var(--f-ink)}
footer.wmf .wmf-mark{width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:none;box-shadow:none}
footer.wmf .wmf-mark img{width:36px;height:36px;display:block;max-width:none}
footer.wmf .wmf-brand-text{display:flex;flex-direction:column;line-height:1.2}
footer.wmf .wmf-brand-name{color:var(--f-ink);font-size:20px;font-weight:700}
footer.wmf .wmf-accent{color:var(--f-primary)}
footer.wmf .wmf-brand-by{color:var(--f-muted);font-size:13px;font-weight:400}
footer.wmf .wmf-desc{margin:16px 0 0;max-width:300px;color:var(--f-muted);font-size:14px;font-weight:300;line-height:1.55}
footer.wmf .wmf-mascot{display:inline-flex;align-items:center;gap:12px;margin-top:20px;padding:8px 14px 8px 8px;border:1px solid var(--f-hair);border-radius:18px;background:var(--f-canvas);color:var(--f-ink);transition:transform .2s ease,border-color .2s ease}
footer.wmf .wmf-mascot:hover,footer.wmf .wmf-mascot:focus-visible{border-color:var(--f-primary);transform:translateY(-2px)}
footer.wmf .wmf-mascot img{width:72px;height:auto;aspect-ratio:16/9;border-radius:10px;display:block;object-fit:cover;max-width:none}
footer.wmf .wmf-mascot span{display:flex;flex-direction:column;line-height:1.25}
footer.wmf .wmf-mascot b{font-size:14px;font-weight:700;color:var(--f-ink)}
footer.wmf .wmf-mascot small{font-size:12px;color:var(--f-muted)}
footer.wmf .wmf-social{display:flex;flex-direction:column;gap:14px;margin-top:24px}
footer.wmf .wmf-social-label{margin-bottom:6px;color:var(--f-muted);font-size:12px;line-height:1.3}
footer.wmf .wmf-social-row{display:flex;flex-wrap:wrap;gap:8px}
footer.wmf .wmf-social-btn{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;border:1px solid var(--f-hair);background:var(--f-canvas);color:var(--f-ink);transition:transform .2s ease,color .2s ease,border-color .2s ease}
footer.wmf .wmf-social-btn:hover,footer.wmf .wmf-social-btn:focus-visible{color:var(--f-primary);border-color:var(--f-primary);transform:translateY(-2px)}
footer.wmf .wmf-social-btn:active{transform:scale(.95)}
footer.wmf .wmf-social-btn svg{width:24px;height:24px;display:block}
footer.wmf .wmf-title{margin:0 0 12px;padding:0;color:var(--f-ink);font-family:inherit;font-size:18px;font-weight:700;line-height:1.4;letter-spacing:normal;text-transform:none}
footer.wmf .wmf-links{list-style:none;margin:0;padding:0}
footer.wmf .wmf-links li{margin:0;padding:0;list-style:none}
footer.wmf .wmf-links a,footer.wmf .wmf-legal a{display:inline-flex;align-items:center;min-height:44px;color:var(--f-body);font-size:15px;font-weight:400;line-height:1.4;transition:color .2s ease}
footer.wmf .wmf-links a:hover,footer.wmf .wmf-links a:focus-visible,footer.wmf .wmf-legal a:hover,footer.wmf .wmf-legal a:focus-visible{color:var(--f-primary)}
footer.wmf .wmf-bottom{border-top:1px solid var(--f-hair)}
footer.wmf .wmf-bottom-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px 24px;padding-top:14px;padding-bottom:14px}
footer.wmf .wmf-copy{color:var(--f-muted);font-size:14px;line-height:1.43;letter-spacing:-.1px}
footer.wmf .wmf-legal{display:flex;flex-wrap:wrap;gap:0 28px;margin-right:64px}
@media(max-width:900px){footer.wmf .wmf-grid{grid-template-columns:repeat(3,1fr)}
footer.wmf .wmf-brand-col{grid-column:1 / -1}
}
@media(max-width:640px){footer.wmf{padding-top:48px}
footer.wmf .wmf-wrap{padding:0 20px}
footer.wmf .wmf-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px}
footer.wmf .wmf-bottom-inner{flex-direction:column;align-items:flex-start}
footer.wmf .wmf-legal{margin-right:0}
}

/* ===== loader, dock and bottom sheet: from the UI kit ===== */
#loader{position:fixed;inset:0;z-index:9999;background:var(--canvas);display:flex;align-items:center;justify-content:center;transition:opacity .4s ease,visibility .4s ease}
#loader.hide{opacity:0;visibility:hidden}
.loader-blob{width:64px;height:64px;border-radius:28px;background:var(--primary-soft);box-shadow:8px 8px 20px var(--clay-dark),-8px -8px 20px var(--clay-light);animation:pulse 1.1s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(.85)}50%{transform:scale(1.05)}}
.dock{position:fixed;z-index:150;left:50%;bottom:calc(14px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);width:max-content;max-width:calc(100% - 24px);animation:dockIn .7s cubic-bezier(.34,1.56,.64,1) .25s both;transition:transform .45s cubic-bezier(.4,0,.2,1),opacity .3s ease}
.dock.hide{transform:translateX(-50%) translateY(calc(100% + 28px));opacity:0}
@keyframes dockIn{from{transform:translateX(-50%) translateY(140%) scale(.9);opacity:0}to{transform:translateX(-50%) translateY(0) scale(1);opacity:1}}
.dock-bar{position:relative;display:flex;align-items:center;gap:4px;padding:9px;border-radius:var(--radius-pill);background:color-mix(in srgb,var(--surface) 82%,transparent);-webkit-backdrop-filter:blur(18px) saturate(170%);backdrop-filter:blur(18px) saturate(170%);border:1px solid var(--hairline);box-shadow:10px 10px 26px var(--clay-dark),-8px -8px 22px var(--clay-light),inset 0 1px 0 rgba(255,255,255,.35)}
[data-theme="dark"] .dock-bar{box-shadow:0 18px 40px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.06)}
.dock-indicator{position:absolute;top:9px;left:0;width:48px;height:48px;border-radius:50%;z-index:0;background:radial-gradient(circle at 32% 26%,color-mix(in srgb,var(--primary) 70%,#fff),var(--primary) 70%);box-shadow:0 10px 22px color-mix(in srgb,var(--primary) 55%,transparent),inset 0 1px 1px rgba(255,255,255,.45);transform:translateX(var(--dx,0));transition:transform .6s cubic-bezier(.34,1.45,.5,1);pointer-events:none}
.dock-indicator.no-anim{transition:none}
.dock-btn{position:relative;z-index:1;width:48px;height:48px;padding:0;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--muted);-webkit-tap-highlight-color:transparent;outline:none;transition:transform .35s cubic-bezier(.34,1.56,.64,1),color .25s ease}
.dock-btn svg{width:22px;height:22px;transition:transform .35s cubic-bezier(.34,1.56,.64,1)}
@media (hover:hover) and (pointer:fine){.dock-btn:hover{transform:translateY(-6px) scale(1.18);color:var(--primary)}
.dock-btn:hover + .dock-btn,.dock-btn:has(+ .dock-btn:hover){transform:translateY(-2px) scale(1.07)}
.dock-btn[aria-current="page"]:hover{color:var(--on-primary)}

}
.dock-btn:active{transform:scale(.86)}
.dock-btn:focus-visible{box-shadow:0 0 0 3px var(--primary-soft),0 0 0 5px var(--primary)}
.dock-btn[aria-current="page"]{color:var(--on-primary)}
.dock-btn[aria-current="page"] svg{animation:dockPop .6s cubic-bezier(.34,1.56,.64,1) .1s both}
@keyframes dockPop{0%{transform:scale(.6) rotate(-12deg)}100%{transform:scale(1) rotate(0)}}
.dock-btn::after{content:attr(data-label);position:absolute;bottom:calc(100% + 14px);left:50%;transform:translate(-50%,6px) scale(.9);transform-origin:bottom center;padding:6px 12px;border-radius:var(--radius-pill);white-space:nowrap;font-size:12px;font-weight:700;letter-spacing:.2px;color:var(--canvas);background:var(--ink);box-shadow:0 6px 16px rgba(0,0,0,.2);opacity:0;pointer-events:none;transition:opacity .2s ease,transform .3s cubic-bezier(.34,1.56,.64,1)}
[data-theme="dark"] .dock-btn::after{background:var(--primary);color:var(--on-primary)}
@media (hover:hover) and (pointer:fine){.dock-btn:hover::after{opacity:1;transform:translate(-50%,0) scale(1)}
}
.dock-btn:focus-visible::after{opacity:1;transform:translate(-50%,0) scale(1)}
.dock-ripple{position:absolute;inset:0;border-radius:50%;background:var(--primary);opacity:.35;pointer-events:none;transform:scale(0);animation:dockRipple .55s ease-out forwards}
@keyframes dockRipple{to{transform:scale(2.6);opacity:0}}
@media(max-width:400px){.dock-bar{gap:2px;padding:8px}
.dock-indicator{top:8px;width:44px;height:44px}
.dock-btn{width:44px;height:44px}
.dock-btn svg{width:20px;height:20px}

}
a.dock-btn{text-decoration:none}
.dock-btn{color:var(--k,var(--muted))}
.dock-btn[aria-current="page"],.dock-btn[aria-current="page"]:hover{color:var(--on-primary)}
.dock-btn::after{z-index:5}
/* ---------- bottom sheet ---------- */
.bs-back{position:fixed;inset:0;z-index:var(--z-modal);background:var(--scrim);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);opacity:0;visibility:hidden;transition:opacity .3s ease,visibility 0s linear .3s}
.bs-back.open{opacity:1;visibility:visible;transition-delay:0s}
.bs{position:fixed;left:50%;bottom:0;z-index:calc(var(--z-modal) + 1);width:min(520px,100%);max-height:88vh;overflow-y:auto;overscroll-behavior:contain;padding:0 22px calc(22px + env(safe-area-inset-bottom,0px));background:var(--surface);border-radius:var(--radius-card) var(--radius-card) 0 0;box-shadow:0 -10px 40px rgba(26,23,48,.28);transform:translate(-50%,105%);visibility:hidden;transition:transform .4s var(--ease-out),visibility 0s linear .4s;outline:none}
.bs.open{transform:translate(-50%,0);visibility:visible;transition-delay:0s}
.bs-handle{display:grid;place-items:center;height:36px;margin:0 -22px;cursor:grab;touch-action:none}
.bs-handle span{display:block;width:44px;height:5px;border-radius:99px;background:var(--hairline-strong)}
.bs h3{font-size:20px;color:var(--ink);margin-bottom:4px}
.bs-sub{font-size:14.5px;color:var(--muted);margin-bottom:14px}
.bs-list{list-style:none;margin:0 0 16px;padding:0;display:grid;gap:10px}
.bs-row{display:flex;align-items:center;gap:14px;width:100%;min-height:60px;padding:8px 14px 8px 10px;border-radius:var(--radius-md);background:var(--canvas);box-shadow:var(--e-sm);text-align:left;transition:transform .2s var(--ease-out)}
.bs-row:hover,.bs-row:focus-visible{transform:translateY(-2px)}
.bs-row:active{transform:scale(.98)}
.bs-ic{flex:none;width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--c);color:var(--k)}
.bs-ic svg,.ud-ic svg,.nt-i svg,.sg-ic svg,.mi svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.bs-row b{display:block;color:var(--ink);font-size:15px}
.bs-row small{color:var(--muted);font-size:13px}
.bs-row>div{flex:1;min-width:0}
.bs-row>svg{width:18px;height:18px;fill:none;stroke:var(--muted);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}

.bs a.bs-row{text-decoration:none}
body.sheet-open{overflow:hidden}

/* ===== forms: syllabus, options, switch ===== */
.syl{margin-top:26px}
.opt-row{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:26px}
@media(max-width:640px){.opt-row{grid-template-columns:minmax(0,1fr)}}
.tchip.plain span{padding:0 20px}
.sw{display:inline-flex;align-items:center;gap:10px;font-size:14px;font-weight:700;color:var(--ink);cursor:pointer;position:relative;min-height:44px}
.sw input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.sw i{width:48px;height:28px;border-radius:99px;background:var(--canvas-deep);box-shadow:var(--e-pressed);position:relative;transition:background .2s;flex:none}
.sw i::after{content:"";position:absolute;top:4px;left:4px;width:20px;height:20px;border-radius:50%;background:var(--surface);box-shadow:var(--e-sm);transition:transform .25s var(--ease-out)}
.sw input:checked+i{background:var(--primary)}
.sw input:checked+i::after{transform:translateX(20px);background:#fff}
.sw input:focus-visible+i{outline:2px solid var(--primary);outline-offset:3px}

/* ===== error card, skeleton ===== */
.err-card{display:flex;gap:14px;align-items:flex-start;padding:16px 18px;border-radius:var(--radius-md);background:var(--red);color:var(--red-ink);box-shadow:var(--e-sm)}
.err-card .ei{flex:none;width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:var(--surface);color:var(--red-ink)}
.err-card .ei svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.err-card b{display:block;font-size:15.5px}
.err-card span{display:block;font-size:14px;line-height:1.5;margin-top:2px}
.skel{border-radius:12px;height:14px;margin:10px 0;background:linear-gradient(90deg,var(--canvas-deep) 25%,var(--primary-soft) 50%,var(--canvas-deep) 75%);background-size:200% 100%;animation:shim 1.3s linear infinite}
.skel.w1{width:92%}.skel.w2{width:76%}.skel.w3{width:58%}.skel.h{height:26px;width:42%;margin:0 0 14px}
.skel-card{padding:18px 20px;border-radius:20px;background:var(--canvas-deep);margin:14px 0}
@keyframes shim{to{background-position:-200% 0}}

/* ===== question layouts ===== */
.sheet .sec-label{display:block;margin:22px 0 4px;font-size:13px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;color:var(--primary)}
.q-card{background:var(--canvas-deep);border-radius:20px;padding:16px 18px;margin:12px 0;break-inside:avoid;page-break-inside:avoid}
.q-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.q-num{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--c,var(--primary-soft));color:var(--k,var(--primary));font-weight:700;font-size:13px}
.q-card p{margin:6px 0}
.q-q{font-weight:600;color:var(--ink)}
.opts{list-style:none;margin:10px 0 0;padding:0;display:grid;gap:6px}
.opts li{display:flex;gap:10px;margin:0;padding:8px 12px;border-radius:12px;background:var(--surface);border:1px solid var(--hairline-strong);font-size:14.5px;line-height:1.45}
.opts li b{flex:none;min-width:28px;color:var(--primary)}
.sheet:not(.hide-ans) .opts li.ok{background:var(--green);color:var(--green-ink);border-color:transparent}
.sheet:not(.hide-ans) .opts li.ok b{color:var(--green-ink)}
.ans{margin-top:10px;padding:10px 14px;border-radius:12px;background:var(--primary-soft);color:var(--ink);font-size:14.5px;line-height:1.55}
.ans b{color:var(--primary)}
[data-theme="dark"] .ans b{color:var(--primary-active)}
.ans ul,.ans ol{margin:4px 0;padding-left:20px}
.hide-ans .ans{display:none}
.akey{display:none;margin-top:26px;padding-top:6px;border-top:2px solid var(--primary-soft);break-before:page}
.akey-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:10px}
.akey-grid span{padding:8px 10px;border-radius:10px;background:var(--canvas-deep);font-weight:700;color:var(--ink);text-align:center}
.cheat-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start;margin-top:8px}
.cheat-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.blk{background:var(--canvas-deep);border-radius:16px;padding:12px 16px;break-inside:avoid;page-break-inside:avoid}
.blk h5{margin-top:0;background:none;padding:0;font-size:15px;color:var(--primary)}
[data-theme="dark"] .blk h5{color:var(--primary-active)}
.nblk{break-inside:avoid;page-break-inside:avoid}
@media(max-width:640px){.cheat-grid{grid-template-columns:minmax(0,1fr)}.akey-grid{grid-template-columns:repeat(3,1fr)}}
.katex{font-size:1.06em}
.mfb{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.92em;background:var(--canvas-deep);padding:1px 6px;border-radius:6px}

/* ===== PDF cover and print-safe overrides ===== */
.pdf-doc .pdf-cover{height:985px;box-sizing:border-box;display:flex;flex-direction:column;justify-content:space-between;padding:44px 46px;border-radius:0;background:linear-gradient(160deg,#F4F1FC 0%,#E4DEFF 55%,#C7DDFF 100%);color:#2B2640;position:relative;overflow:hidden}
.pdf-doc .pdf-cover::before{content:"";position:absolute;right:-120px;top:-120px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#D9CCFF,rgba(217,204,255,0) 70%)}
.pdf-doc .pdf-cover::after{content:"";position:absolute;left:-140px;bottom:-140px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle at 60% 40%,#BDEBFF,rgba(189,235,255,0) 70%)}
.pdf-doc .pc-top,.pdf-doc .pc-mid,.pdf-doc .pc-foot{position:relative;z-index:1}
.pdf-doc .pc-top{display:flex;justify-content:space-between;font-size:13px;color:#6B6485;font-weight:600}
.pdf-doc .pc-top b{font-size:18px;color:#2B2640}
.pdf-doc .pc-chip{display:inline-block;padding:8px 18px;border-radius:99px;font-size:13px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;background:#2563EB;color:#fff}
.pdf-doc .pc-mid h1{margin:22px 0 14px;font-size:44px;line-height:1.1;color:#2B2640;letter-spacing:-.5px;overflow-wrap:anywhere}
.pdf-doc .pc-meta{font-size:18px;font-weight:600;color:#3d3856}
.pdf-doc .pc-date{margin-top:6px;font-size:15px;color:#6B6485}
.pdf-doc .pc-foot{display:flex;justify-content:space-between;align-items:center;font-size:14px;color:#3d3856}
.pdf-doc .pc-foot b{padding:8px 16px;border-radius:99px;background:#fff;color:#2563EB}
.pdf-doc .akey{display:none;border-top:2px solid #DBE8FF}
.pdf-doc .hide-ans .akey{display:block}
.pdf-doc .cheat-grid{grid-template-columns:1fr 1fr}
.pdf-doc .akey-grid{grid-template-columns:repeat(5,1fr)}
.pdf-doc .opts li.ok{background:#fff}
.pdf-doc .hide-ans .opts li.ok{background:#fff}
@media print{.akey{display:none}.hide-ans .akey{display:block}}

/* ===== home and guide ===== */
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}
@media(max-width:1000px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.grid-4{grid-template-columns:minmax(0,1fr)}}
a.card.tool{display:block;transition:transform .25s var(--ease-out),box-shadow .25s}
a.card.tool:hover{transform:translateY(-4px)}
a.card.tool:active{transform:scale(.97)}
a.card.tool h3{display:flex;align-items:center;justify-content:space-between;gap:8px}
a.card.tool h3 svg{width:18px;height:18px;fill:none;stroke:var(--muted);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .2s}
a.card.tool:hover h3 svg{transform:translateX(4px);stroke:var(--primary)}
.prose{max-width:760px;margin:0 auto}
.prose h3{font-size:22px;color:var(--ink);margin:28px 0 8px}
.prose h3:first-child{margin-top:0}
.prose p{font-size:16px;line-height:1.75;color:var(--body-c);margin:10px 0}
.prose ol,.prose ul{margin:10px 0;padding-left:22px;color:var(--body-c);line-height:1.75}
.prose strong{color:var(--ink)}
.strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:8px}
@media(max-width:720px){.strip{grid-template-columns:minmax(0,1fr)}}
.model-card{display:flex;gap:16px;align-items:flex-start}
.model-card .card-ico{margin:0;flex:none}
.cta{text-align:center;padding:44px 26px;border-radius:var(--radius-card);background:var(--surface);box-shadow:var(--e-lg)}
.cta h2{font-size:clamp(24px,4vw,34px);color:var(--ink);margin-bottom:10px}
.cta p{max-width:560px;margin:0 auto 22px;color:var(--muted);font-size:16px;line-height:1.6}
.faq-group{max-width:760px;margin:0 auto 36px}
.faq-group>h2{font-size:22px;color:var(--ink);margin:0 0 14px}
.faq-group .faq-list{max-width:none}

:root{--z-nav:50;--z-menu:49;--z-side:48;--z-dock:100;--z-drawer:210;--z-toast:300;--z-modal:500;--z-loader:9999}
.dock-btn svg,.bs-ic svg,.hero-badge svg,.powered svg{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.pdf-doc .sheet{padding:0;box-shadow:none;border-radius:0;background:#fff}.pdf-doc .sheet>*:last-child{margin-bottom:0}