/* =========================================================
   THE LAB — interactive design-system playground
   Scoped tokens (--lb-*), themeable via [data-theme], density
   via [data-density], motion via [data-motion]. Monochrome base
   + a justified semantic palette (success/warning/danger/info).
   ========================================================= */

/* ---------- Token themes ---------- */
.lab-body[data-theme="light"]{
  --lb-bg:#F5F4F2; --lb-surface:#FFFFFF; --lb-surface-2:#ECEBE7; --lb-inset:#F0EFEC;
  --lb-text:#0F0F0F; --lb-muted:#5C5C5C; --lb-faint:#8C8C8C;
  --lb-border:rgba(15,15,15,.14); --lb-border-strong:rgba(15,15,15,.34); --lb-border-w:1px;
  --lb-accent:#0F0F0F; --lb-on-accent:#F7F6F4;
  --lb-focus:#1F5FBF;
  --lb-success:#146B3E; --lb-success-bg:#E7F1EB;
  --lb-warning:#8A5A00; --lb-warning-bg:#F6EEDC;
  --lb-danger:#BE2A1F;  --lb-danger-bg:#F7E5E3;
  --lb-info:#1F5FBF;    --lb-info-bg:#E5EDFA;
  --lb-shadow-1:0 1px 2px rgba(15,15,15,.06), 0 1px 1px rgba(15,15,15,.04);
  --lb-shadow-2:0 6px 16px -6px rgba(15,15,15,.16), 0 2px 6px -3px rgba(15,15,15,.10);
  --lb-shadow-3:0 24px 48px -18px rgba(15,15,15,.28), 0 8px 20px -12px rgba(15,15,15,.18);
}
.lab-body[data-theme="dark"]{
  --lb-bg:#0E0E10; --lb-surface:#17171A; --lb-surface-2:#202024; --lb-inset:#111114;
  --lb-text:#F3F3F1; --lb-muted:#A6A6AD; --lb-faint:#74747C;
  --lb-border:rgba(255,255,255,.14); --lb-border-strong:rgba(255,255,255,.34); --lb-border-w:1px;
  --lb-accent:#F3F3F1; --lb-on-accent:#0E0E10;
  --lb-focus:#7FB2FF;
  --lb-success:#54D08A; --lb-success-bg:#12291D;
  --lb-warning:#E8B54B; --lb-warning-bg:#2C2411;
  --lb-danger:#F58379;  --lb-danger-bg:#2E1613;
  --lb-info:#7FB2FF;    --lb-info-bg:#12203A;
  --lb-shadow-1:0 1px 2px rgba(0,0,0,.4);
  --lb-shadow-2:0 8px 20px -8px rgba(0,0,0,.6);
  --lb-shadow-3:0 28px 56px -18px rgba(0,0,0,.7);
}
.lab-body[data-theme="contrast"]{
  --lb-bg:#FFFFFF; --lb-surface:#FFFFFF; --lb-surface-2:#FFFFFF; --lb-inset:#FFFFFF;
  --lb-text:#000000; --lb-muted:#000000; --lb-faint:#1A1A1A;
  --lb-border:#000000; --lb-border-strong:#000000; --lb-border-w:2px;
  --lb-accent:#000000; --lb-on-accent:#FFFFFF;
  --lb-focus:#0A2AD6;
  --lb-success:#036D24; --lb-success-bg:#FFFFFF;
  --lb-warning:#7A4B00; --lb-warning-bg:#FFFFFF;
  --lb-danger:#B00000;  --lb-danger-bg:#FFFFFF;
  --lb-info:#0A2AD6;    --lb-info-bg:#FFFFFF;
  --lb-shadow-1:0 0 0 2px #000; --lb-shadow-2:0 0 0 2px #000; --lb-shadow-3:0 0 0 3px #000;
}

/* radius + spacing + motion tokens (density scales spacing) */
.lab-body{
  --lb-r-sm:7px; --lb-r-md:12px; --lb-r-lg:18px; --lb-r-pill:999px;
  --lb-s-1:4px; --lb-s-2:8px; --lb-s-3:12px; --lb-s-4:16px; --lb-s-5:24px; --lb-s-6:32px; --lb-s-7:48px;
  --lb-ctl-h:44px; --lb-ctl-h-sm:36px; --lb-ctl-h-lg:54px;
  --lb-ease:cubic-bezier(.2,.7,.2,1);
  --lb-ease-out:cubic-bezier(0,.62,.34,1);
  --lb-ease-in:cubic-bezier(.4,0,1,.5);
  --lb-spring:cubic-bezier(.34,1.56,.64,1);
  --lb-d1:120ms; --lb-d2:200ms; --lb-d3:320ms;
}
.lab-body[data-density="compact"]{
  --lb-s-3:8px; --lb-s-4:12px; --lb-s-5:16px; --lb-s-6:22px; --lb-s-7:32px;
  --lb-ctl-h:36px; --lb-ctl-h-sm:30px; --lb-ctl-h-lg:44px;
}
/* motion off: kill transitions + animations inside the lab */
.lab-body[data-motion="reduced"] *,
.lab-body[data-motion="reduced"] *::before,
.lab-body[data-motion="reduced"] *::after{
  transition-duration:.001ms !important; animation-duration:.001ms !important; animation-iteration-count:1 !important; scroll-behavior:auto !important;
}

/* ---------- Page base + nav retheme ---------- */
.lab-body{ background:var(--lb-bg); color:var(--lb-text); transition:background .45s var(--lb-ease), color .45s var(--lb-ease) }
.lab-body .nav.scrolled{ background:color-mix(in srgb, var(--lb-bg) 82%, transparent); box-shadow:0 1px 0 var(--lb-border) }
.lab-body .nav__links a{ color:var(--lb-muted) } .lab-body .nav__links a:hover{ color:var(--lb-text) }
.lab-body .nav__cta{ border-color:var(--lb-text); color:var(--lb-text)!important }
.lab-body .nav__cta:hover{ background:var(--lb-text); color:var(--lb-bg)!important }
.lab-body .nav__burger span,.lab-body .nav__burger span::before,.lab-body .nav__burger span::after{ background:var(--lb-text) }
.lab-body .lang-toggle button{ color:var(--lb-faint) } .lab-body .lang-toggle button:hover,.lab-body .lang-toggle button.on{ color:var(--lb-text) }
.lab-body[data-theme="dark"] .nav__logo{ filter:invert(1) brightness(1.9) }
.lab-body .mobile-menu{ background:var(--lb-bg) } .lab-body .mobile-menu a{ color:var(--lb-text) }

/* ---------- Focus system (never removed) ---------- */
.lab-body :focus-visible{ outline:3px solid var(--lb-focus); outline-offset:2px; border-radius:4px }
.lab-body :focus:not(:focus-visible){ outline:none }

/* ---------- Layout ---------- */
.lab-main{ max-width:1220px; margin-inline:auto; padding-inline:clamp(1.1rem,4vw,3rem); padding-top:clamp(6rem,13vh,8rem) }
.lab-hero{ padding-block:clamp(1rem,3vh,2rem) clamp(2rem,5vh,3.5rem) }
.lab-kicker{ font-family:var(--f-mono); font-size:.72rem; letter-spacing:.3em; text-transform:uppercase; color:var(--lb-faint); display:inline-flex; gap:.7rem; align-items:center }
.lab-kicker b{ color:var(--lb-text); font-weight:600 }
.lab-title{ font-family:var(--f-display); font-weight:900; letter-spacing:-.045em; line-height:.9; text-transform:uppercase; font-size:clamp(2.8rem,11vw,7.5rem); margin-top:1rem }
.lab-title .it{ font-family:'Playfair Display',serif; font-weight:600; font-style:italic; text-transform:none; letter-spacing:-.01em }
.lab-sub{ margin-top:1.4rem; max-width:60ch; color:var(--lb-muted); font-size:1.06rem; line-height:1.65 }

.lab-sec{ padding-block:clamp(2.5rem,6vh,4.5rem); border-top:var(--lb-border-w) solid var(--lb-border) }
.lab-sec__head{ display:flex; flex-direction:column; gap:.7rem; margin-bottom:clamp(1.8rem,4vh,2.8rem) }
.lab-sec__n{ font-family:var(--f-mono); font-size:.72rem; letter-spacing:.24em; text-transform:uppercase; color:var(--lb-faint) }
.lab-sec__n b{ color:var(--lb-text); font-weight:600 }
.lab-sec h2{ font-family:var(--f-display); font-weight:900; letter-spacing:-.03em; text-transform:uppercase; line-height:.95; font-size:clamp(1.7rem,5vw,3rem) }
.lab-sec__lead{ max-width:64ch; color:var(--lb-muted); line-height:1.6; margin-top:.2rem }
.lab-grid{ display:grid; gap:clamp(1rem,2vw,1.5rem) }
.lab-panel{ background:var(--lb-surface); border:var(--lb-border-w) solid var(--lb-border); border-radius:var(--lb-r-lg); padding:clamp(1.2rem,2.4vw,1.8rem) }
.lab-panel__label{ font-family:var(--f-mono); font-size:.68rem; letter-spacing:.18em; text-transform:uppercase; color:var(--lb-faint); margin-bottom:1rem; display:block }
.lab-rowlabel{ font-family:var(--f-mono); font-size:.7rem; letter-spacing:.06em; color:var(--lb-faint); text-transform:uppercase }

/* ---------- Sticky control bar (theme / density / motion) ---------- */
.lab-controls{
  position:sticky; top:clamp(4.6rem,10vh,5.4rem); z-index:60; margin-bottom:clamp(1.5rem,4vh,2.5rem);
  display:flex; flex-wrap:wrap; gap:.8rem 1.4rem; align-items:center; justify-content:space-between;
  background:color-mix(in srgb, var(--lb-surface) 86%, transparent); backdrop-filter:blur(14px);
  border:var(--lb-border-w) solid var(--lb-border); border-radius:var(--lb-r-pill); padding:.5rem .6rem .5rem 1.2rem;
  box-shadow:var(--lb-shadow-1);
}
.lab-controls__group{ display:flex; align-items:center; gap:.7rem }
.lab-controls__cap{ font-family:var(--f-mono); font-size:.66rem; letter-spacing:.16em; text-transform:uppercase; color:var(--lb-faint) }

/* segmented control (reused for theme + density) */
.lb-seg{ display:inline-flex; background:var(--lb-inset); border:var(--lb-border-w) solid var(--lb-border); border-radius:var(--lb-r-pill); padding:3px; position:relative }
.lb-seg button{ appearance:none; background:none; border:none; cursor:pointer; font-family:var(--f-mono); font-size:.76rem; letter-spacing:.04em; color:var(--lb-muted); padding:.42rem .85rem; border-radius:var(--lb-r-pill); z-index:1; transition:color var(--lb-d2) var(--lb-ease); display:inline-flex; align-items:center; gap:.4rem; min-height:32px }
.lb-seg button svg{ width:15px; height:15px }
.lb-seg button[aria-checked="true"]{ color:var(--lb-on-accent) }
.lb-seg__thumb{ position:absolute; top:3px; bottom:3px; border-radius:var(--lb-r-pill); background:var(--lb-accent); transition:transform var(--lb-d3) var(--lb-spring), width var(--lb-d3) var(--lb-spring); z-index:0 }

/* switch */
.lb-switch{ display:inline-flex; align-items:center; gap:.6rem; cursor:pointer; font-family:var(--f-mono); font-size:.76rem; color:var(--lb-muted) }
.lb-switch input{ position:absolute; opacity:0; width:0; height:0 }
.lb-switch__track{ width:46px; height:27px; border-radius:999px; background:var(--lb-surface-2); border:var(--lb-border-w) solid var(--lb-border-strong); position:relative; transition:background var(--lb-d2) var(--lb-ease), border-color var(--lb-d2) var(--lb-ease); flex:none }
.lb-switch__track::after{ content:""; position:absolute; top:50%; left:3px; transform:translateY(-50%); width:19px; height:19px; border-radius:50%; background:var(--lb-accent); transition:transform var(--lb-d3) var(--lb-spring) }
.lb-switch input:checked + .lb-switch__track{ background:var(--lb-accent); border-color:var(--lb-accent) }
.lb-switch input:checked + .lb-switch__track::after{ transform:translateY(-50%) translateX(19px); background:var(--lb-on-accent) }
.lb-switch input:focus-visible + .lb-switch__track{ outline:3px solid var(--lb-focus); outline-offset:2px }
.lb-switch input:disabled + .lb-switch__track{ opacity:.4 }

/* ---------- TOKENS: color ---------- */
.swatches-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(120px,1fr)); gap:.7rem }
.sw2{ appearance:none; text-align:left; border:var(--lb-border-w) solid var(--lb-border); background:var(--lb-surface); border-radius:var(--lb-r-md); overflow:hidden; cursor:copy; transition:transform var(--lb-d2) var(--lb-ease), box-shadow var(--lb-d2) var(--lb-ease); font:inherit; color:inherit }
.sw2:hover{ transform:translateY(-3px); box-shadow:var(--lb-shadow-2) }
.sw2__chip{ height:64px; border-bottom:var(--lb-border-w) solid var(--lb-border) }
.sw2__meta{ padding:.6rem .7rem }
.sw2__name{ font-family:var(--f-display); font-weight:700; font-size:.9rem; letter-spacing:-.01em }
.sw2__val{ font-family:var(--f-mono); font-size:.68rem; color:var(--lb-faint); text-transform:uppercase; margin-top:.15rem; display:flex; align-items:center; gap:.35rem }
.sw2__val svg{ width:12px; height:12px; opacity:0; transition:opacity var(--lb-d2) }
.sw2:hover .sw2__val svg{ opacity:.7 }

/* type scale */
.typerows{ display:flex; flex-direction:column; gap:1rem }
.typerow{ display:grid; grid-template-columns:110px 1fr; gap:1.2rem; align-items:baseline; border-bottom:var(--lb-border-w) solid var(--lb-border); padding-bottom:.9rem }
.typerow:last-child{ border-bottom:none }
.typerow .spec{ font-family:var(--f-mono); font-size:.68rem; color:var(--lb-faint); text-transform:uppercase; letter-spacing:.06em }
.typerow .samp{ color:var(--lb-text); overflow:hidden; text-overflow:ellipsis; white-space:nowrap }
.ts-display{ font-family:var(--f-display); font-weight:900; font-size:2.4rem; letter-spacing:-.03em }
.ts-title{ font-family:var(--f-display); font-weight:800; font-size:1.5rem; letter-spacing:-.02em }
.ts-body{ font-size:1rem } .ts-label{ font-family:var(--f-mono); font-size:.8rem; letter-spacing:.14em; text-transform:uppercase; color:var(--lb-muted) }
.ts-serif{ font-family:'Playfair Display',serif; font-style:italic; font-size:1.6rem }

/* spacing + radius + elevation */
.spacebars{ display:flex; align-items:flex-end; gap:.7rem; height:120px }
.spacebar{ display:flex; flex-direction:column; align-items:center; gap:.5rem; color:var(--lb-faint); font-family:var(--f-mono); font-size:.66rem }
.spacebar i{ display:block; width:26px; background:var(--lb-accent); border-radius:5px 5px 0 0 }
.radchips{ display:flex; flex-wrap:wrap; gap:.8rem }
.radchip{ display:flex; flex-direction:column; align-items:center; gap:.5rem; font-family:var(--f-mono); font-size:.66rem; color:var(--lb-faint) }
.radchip i{ width:64px; height:44px; background:var(--lb-surface-2); border:var(--lb-border-w) solid var(--lb-border-strong) }
.elevrow{ display:grid; grid-template-columns:repeat(auto-fit,minmax(120px,1fr)); gap:1rem }
.elevcard{ height:84px; border-radius:var(--lb-r-md); background:var(--lb-surface); border:var(--lb-border-w) solid var(--lb-border); display:flex; align-items:flex-end; padding:.6rem; font-family:var(--f-mono); font-size:.66rem; color:var(--lb-faint) }

/* motion curves */
.motion-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:1rem }
.curvecard{ border:var(--lb-border-w) solid var(--lb-border); border-radius:var(--lb-r-md); padding:1rem; background:var(--lb-surface) }
.curvecard svg{ width:100%; height:70px; display:block }
.curvecard .cv-path{ fill:none; stroke:var(--lb-border-strong); stroke-width:2 }
.curvecard .cv-line{ stroke:var(--lb-accent); stroke-width:2.5; fill:none }
.curvecard .cv-dot{ fill:var(--lb-accent) }
.curvecard .name{ font-family:var(--f-display); font-weight:700; font-size:.92rem; margin-top:.5rem }
.curvecard .dur{ font-family:var(--f-mono); font-size:.68rem; color:var(--lb-faint) }
.curve-demo{ height:8px; margin-top:.7rem; position:relative }
.curve-demo i{ position:absolute; top:0; left:0; width:14px; height:8px; border-radius:4px; background:var(--lb-accent) }

/* ---------- BUTTONS ---------- */
.lb-btn{
  --_bg:var(--lb-accent); --_fg:var(--lb-on-accent); --_bd:var(--lb-accent);
  appearance:none; cursor:pointer; font-family:var(--f-mono); font-weight:500; font-size:.85rem; letter-spacing:.02em;
  display:inline-flex; align-items:center; justify-content:center; gap:.5rem; position:relative;
  height:var(--lb-ctl-h); padding:0 1.3rem; border-radius:var(--lb-r-pill);
  background:var(--_bg); color:var(--_fg); border:var(--lb-border-w) solid var(--_bd);
  transition:transform var(--lb-d1) var(--lb-ease), box-shadow var(--lb-d2) var(--lb-ease), background var(--lb-d2) var(--lb-ease), color var(--lb-d2) var(--lb-ease), opacity var(--lb-d2);
  -webkit-tap-highlight-color:transparent; touch-action:manipulation; white-space:nowrap;
}
.lb-btn svg{ width:17px; height:17px; flex:none }
.lb-btn:hover{ box-shadow:var(--lb-shadow-2) }
.lb-btn:active{ transform:scale(.965) }
.lb-btn--secondary{ --_bg:transparent; --_fg:var(--lb-text); --_bd:var(--lb-border-strong) }
.lb-btn--secondary:hover{ --_bg:var(--lb-surface-2) }
.lb-btn--ghost{ --_bg:transparent; --_fg:var(--lb-text); --_bd:transparent }
.lb-btn--ghost:hover{ --_bg:var(--lb-surface-2) }
.lb-btn--danger{ --_bg:var(--lb-danger); --_fg:#fff; --_bd:var(--lb-danger) }
.lb-btn--success{ --_bg:var(--lb-success); --_fg:#fff; --_bd:var(--lb-success) }
.lb-btn--sm{ height:var(--lb-ctl-h-sm); padding:0 .95rem; font-size:.78rem }
.lb-btn--lg{ height:var(--lb-ctl-h-lg); padding:0 1.7rem; font-size:.94rem }
.lb-btn--icon{ width:var(--lb-ctl-h); padding:0 } .lb-btn--icon.lb-btn--sm{ width:var(--lb-ctl-h-sm) }
.lb-btn:disabled, .lb-btn[aria-disabled="true"]{ opacity:.42; cursor:not-allowed; box-shadow:none; transform:none; pointer-events:none }
.lb-btn.is-loading{ color:transparent; pointer-events:none }
.lb-btn.is-loading .lb-btn__label{ visibility:hidden }
.lb-btn__spin{ position:absolute; inset:0; margin:auto; width:18px; height:18px; border-radius:50%; border:2px solid currentColor; border-top-color:transparent; color:var(--_fg); opacity:0; animation:lb-spin .7s linear infinite }
.lb-btn.is-loading .lb-btn__spin{ opacity:1 }
.lb-btn.is-done{ --_bg:var(--lb-success); --_fg:#fff; --_bd:var(--lb-success) }
@keyframes lb-spin{ to{ transform:rotate(360deg) } }
.btn-row{ display:flex; flex-wrap:wrap; gap:.7rem; align-items:center }
.btn-state-grid{ display:grid; grid-template-columns:auto 1fr; gap:.9rem 1.4rem; align-items:center }
.btn-state-grid > .lab-rowlabel{ justify-self:start }

/* ---------- FORMS ---------- */
.form-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:clamp(1.2rem,3vw,2rem) }
.lb-field{ position:relative; display:flex; flex-direction:column; gap:.45rem }
.lb-field__box{ position:relative }
.lb-input, .lb-textarea, .lb-select{
  width:100%; height:var(--lb-ctl-h); padding:0 .9rem; font:inherit; font-size:.95rem; color:var(--lb-text);
  background:var(--lb-surface); border:var(--lb-border-w) solid var(--lb-border-strong); border-radius:var(--lb-r-md);
  transition:border-color var(--lb-d2) var(--lb-ease), box-shadow var(--lb-d2) var(--lb-ease), background var(--lb-d2);
}
.lb-textarea{ height:auto; min-height:96px; padding:.7rem .9rem; resize:vertical; line-height:1.5 }
.lb-input::placeholder,.lb-textarea::placeholder{ color:var(--lb-faint) }
.lb-input:hover,.lb-textarea:hover,.lb-select:hover{ border-color:var(--lb-text) }
.lb-input:focus,.lb-textarea:focus,.lb-select:focus{ outline:none; border-color:var(--lb-focus); box-shadow:0 0 0 3px color-mix(in srgb, var(--lb-focus) 26%, transparent) }
.lb-field label{ font-family:var(--f-mono); font-size:.72rem; letter-spacing:.08em; text-transform:uppercase; color:var(--lb-muted) }
.lb-field label .req{ color:var(--lb-danger) }
.lb-help{ font-size:.78rem; color:var(--lb-faint); display:flex; align-items:center; gap:.4rem; min-height:1.1em }
.lb-help svg{ width:13px; height:13px; flex:none }
.lb-field.is-error .lb-input,.lb-field.is-error .lb-textarea{ border-color:var(--lb-danger); box-shadow:0 0 0 3px color-mix(in srgb, var(--lb-danger) 22%, transparent) }
.lb-field.is-error .lb-help{ color:var(--lb-danger) }
.lb-field.is-success .lb-input{ border-color:var(--lb-success) }
.lb-field.is-success .lb-help{ color:var(--lb-success) }
.lb-input:disabled,.lb-textarea:disabled{ opacity:.5; cursor:not-allowed; background:var(--lb-surface-2) }
.lb-input.has-icon-r{ padding-right:2.6rem }
.lb-field__iconbtn{ position:absolute; right:.35rem; top:50%; transform:translateY(-50%); width:34px; height:34px; display:inline-flex; align-items:center; justify-content:center; border:none; background:none; color:var(--lb-muted); cursor:pointer; border-radius:8px }
.lb-field__iconbtn:hover{ color:var(--lb-text); background:var(--lb-surface-2) }
.lb-field__iconbtn svg{ width:18px; height:18px }
.lb-select{ appearance:none; padding-right:2.4rem; background-image:none; cursor:pointer }
.lb-select-wrap{ position:relative }
.lb-select-wrap .chev{ position:absolute; right:.9rem; top:50%; transform:translateY(-50%); width:16px; height:16px; pointer-events:none; color:var(--lb-muted) }
.lb-counter{ font-family:var(--f-mono); font-size:.7rem; color:var(--lb-faint); align-self:flex-end }

/* checkbox + radio */
.lb-choice{ display:flex; flex-direction:column; gap:.7rem }
.lb-check{ display:flex; align-items:center; gap:.7rem; cursor:pointer; font-size:.95rem; min-height:28px }
.lb-check input{ position:absolute; opacity:0; width:0; height:0 }
.lb-check__box{ width:22px; height:22px; border-radius:6px; border:2px solid var(--lb-border-strong); display:inline-flex; align-items:center; justify-content:center; flex:none; transition:background var(--lb-d2) var(--lb-ease), border-color var(--lb-d2) var(--lb-ease) }
.lb-check__box svg{ width:14px; height:14px; color:var(--lb-on-accent); stroke-dasharray:20; stroke-dashoffset:20; transition:stroke-dashoffset var(--lb-d3) var(--lb-ease) }
.lb-check input:checked + .lb-check__box{ background:var(--lb-accent); border-color:var(--lb-accent) }
.lb-check input:checked + .lb-check__box svg{ stroke-dashoffset:0 }
.lb-check--radio .lb-check__box{ border-radius:50% }
.lb-check--radio .lb-check__box::after{ content:""; width:10px; height:10px; border-radius:50%; background:var(--lb-on-accent); transform:scale(0); transition:transform var(--lb-d2) var(--lb-spring) }
.lb-check--radio input:checked + .lb-check__box::after{ transform:scale(1) }
.lb-check input:focus-visible + .lb-check__box{ outline:3px solid var(--lb-focus); outline-offset:2px }
.lb-check input:disabled + .lb-check__box{ opacity:.4 } .lb-check:has(input:disabled){ opacity:.6; cursor:not-allowed }

/* slider */
.lb-slider{ display:flex; flex-direction:column; gap:.7rem }
.lb-range{ -webkit-appearance:none; appearance:none; width:100%; height:6px; border-radius:999px; background:var(--lb-surface-2); border:var(--lb-border-w) solid var(--lb-border); outline-offset:6px }
.lb-range::-webkit-slider-thumb{ -webkit-appearance:none; width:22px; height:22px; border-radius:50%; background:var(--lb-accent); border:2px solid var(--lb-bg); box-shadow:var(--lb-shadow-1); cursor:grab; transition:transform var(--lb-d1) }
.lb-range::-webkit-slider-thumb:active{ transform:scale(1.12); cursor:grabbing }
.lb-range::-moz-range-thumb{ width:20px; height:20px; border-radius:50%; background:var(--lb-accent); border:2px solid var(--lb-bg); cursor:grab }
.lb-range-val{ font-family:var(--f-mono); font-size:.8rem; color:var(--lb-text) }

/* search */
.lb-search{ position:relative }
.lb-search .mag{ position:absolute; left:.85rem; top:50%; transform:translateY(-50%); width:17px; height:17px; color:var(--lb-faint); pointer-events:none }
.lb-search input{ padding-left:2.5rem }
.lb-search .clr{ opacity:0; pointer-events:none } .lb-search.has-val .clr{ opacity:1; pointer-events:auto }

/* ---------- OVERLAYS ---------- */
/* tabs */
.lb-tabs__list{ display:inline-flex; gap:.2rem; position:relative; border-bottom:var(--lb-border-w) solid var(--lb-border); margin-bottom:1.3rem }
.lb-tab{ appearance:none; background:none; border:none; cursor:pointer; font-family:var(--f-mono); font-size:.82rem; letter-spacing:.03em; color:var(--lb-muted); padding:.7rem 1rem; position:relative; transition:color var(--lb-d2) }
.lb-tab[aria-selected="true"]{ color:var(--lb-text) }
.lb-tabs__ink{ position:absolute; bottom:-1px; height:2px; background:var(--lb-accent); transition:transform var(--lb-d3) var(--lb-spring), width var(--lb-d3) var(--lb-spring) }
.lb-tabpanel{ animation:lb-fade var(--lb-d3) var(--lb-ease-out) }
.lb-tabpanel[hidden]{ display:none }
@keyframes lb-fade{ from{ opacity:0; transform:translateY(6px) } to{ opacity:1; transform:none } }

/* accordion */
.lb-acc__item{ border-bottom:var(--lb-border-w) solid var(--lb-border) }
.lb-acc__btn{ width:100%; appearance:none; background:none; border:none; cursor:pointer; font:inherit; color:var(--lb-text); text-align:left; display:flex; align-items:center; justify-content:space-between; gap:1rem; padding:1.1rem 0; font-family:var(--f-display); font-weight:700; font-size:1.05rem; letter-spacing:-.01em }
.lb-acc__btn .ico{ width:22px; height:22px; flex:none; color:var(--lb-muted); transition:transform var(--lb-d3) var(--lb-spring) }
.lb-acc__btn[aria-expanded="true"] .ico{ transform:rotate(45deg) }
.lb-acc__panel{ overflow:hidden; height:0; transition:height var(--lb-d3) var(--lb-ease) }
.lb-acc__inner{ padding-bottom:1.1rem; color:var(--lb-muted); line-height:1.6; max-width:64ch }

/* tooltip */
.lb-tip{ position:relative; display:inline-flex }
.lb-tip__bubble{ position:absolute; bottom:calc(100% + 10px); left:50%; transform:translateX(-50%) translateY(4px); background:var(--lb-accent); color:var(--lb-on-accent); font-family:var(--f-mono); font-size:.72rem; padding:.45rem .7rem; border-radius:8px; white-space:nowrap; opacity:0; pointer-events:none; transition:opacity var(--lb-d2) var(--lb-ease), transform var(--lb-d2) var(--lb-ease); z-index:5 }
.lb-tip__bubble::after{ content:""; position:absolute; top:100%; left:50%; transform:translateX(-50%); border:5px solid transparent; border-top-color:var(--lb-accent) }
.lb-tip:hover .lb-tip__bubble,.lb-tip:focus-within .lb-tip__bubble{ opacity:1; transform:translateX(-50%) translateY(0) }

/* progress + skeleton */
.lb-prog{ height:8px; border-radius:999px; background:var(--lb-surface-2); overflow:hidden; border:var(--lb-border-w) solid var(--lb-border) }
.lb-prog i{ display:block; height:100%; background:var(--lb-accent); border-radius:999px; transition:width var(--lb-d3) var(--lb-ease) }
.lb-prog--indet i{ width:40%; animation:lb-indet 1.3s var(--lb-ease) infinite }
@keyframes lb-indet{ 0%{ transform:translateX(-120%) } 100%{ transform:translateX(320%) } }
.lb-skel{ border-radius:8px; background:linear-gradient(100deg,var(--lb-surface-2) 30%, color-mix(in srgb,var(--lb-surface-2) 60%, var(--lb-bg)) 50%, var(--lb-surface-2) 70%); background-size:200% 100%; animation:lb-shim 1.4s linear infinite }
@keyframes lb-shim{ to{ background-position:-200% 0 } }

/* chips + badges + avatars */
.chip-row{ display:flex; flex-wrap:wrap; gap:.5rem; align-items:center }
.lb-chip{ display:inline-flex; align-items:center; gap:.4rem; font-family:var(--f-mono); font-size:.76rem; padding:.4rem .5rem .4rem .8rem; border:var(--lb-border-w) solid var(--lb-border-strong); border-radius:var(--lb-r-pill); color:var(--lb-text); background:var(--lb-surface) }
.lb-chip button{ appearance:none; border:none; background:none; cursor:pointer; color:var(--lb-muted); width:18px; height:18px; display:inline-flex; align-items:center; justify-content:center; border-radius:50%; transition:background var(--lb-d2), color var(--lb-d2) }
.lb-chip button:hover{ background:var(--lb-danger); color:#fff }
.lb-chip svg{ width:12px; height:12px }
.lb-chip.is-removing{ animation:lb-chipout var(--lb-d3) var(--lb-ease-in) forwards }
@keyframes lb-chipout{ to{ opacity:0; transform:scale(.7); margin-right:calc(-1 * var(--_w,60px)); } }
.lb-badge{ display:inline-flex; align-items:center; gap:.35rem; font-family:var(--f-mono); font-size:.68rem; letter-spacing:.06em; text-transform:uppercase; padding:.3rem .6rem; border-radius:var(--lb-r-pill); font-weight:500 }
.lb-badge svg{ width:12px; height:12px }
.lb-badge--success{ color:var(--lb-success); background:var(--lb-success-bg); border:var(--lb-border-w) solid color-mix(in srgb,var(--lb-success) 30%, transparent) }
.lb-badge--warning{ color:var(--lb-warning); background:var(--lb-warning-bg); border:var(--lb-border-w) solid color-mix(in srgb,var(--lb-warning) 30%, transparent) }
.lb-badge--danger{ color:var(--lb-danger); background:var(--lb-danger-bg); border:var(--lb-border-w) solid color-mix(in srgb,var(--lb-danger) 30%, transparent) }
.lb-badge--info{ color:var(--lb-info); background:var(--lb-info-bg); border:var(--lb-border-w) solid color-mix(in srgb,var(--lb-info) 30%, transparent) }
.lb-badge--neutral{ color:var(--lb-muted); background:var(--lb-surface-2); border:var(--lb-border-w) solid var(--lb-border) }
.avatars{ display:flex } .avatars .av{ width:38px; height:38px; border-radius:50%; border:2px solid var(--lb-bg); background:var(--lb-surface-2); display:flex; align-items:center; justify-content:center; font-family:var(--f-display); font-weight:800; font-size:.85rem; color:var(--lb-muted); margin-left:-10px } .avatars .av:first-child{ margin-left:0 }

/* modal */
.lb-modal{ position:fixed; inset:0; z-index:200; display:flex; align-items:center; justify-content:center; padding:clamp(1rem,4vw,2rem); opacity:0; visibility:hidden; transition:opacity var(--lb-d3) var(--lb-ease), visibility 0s linear var(--lb-d3) }
.lb-modal.open{ opacity:1; visibility:visible; transition:opacity var(--lb-d3) var(--lb-ease), visibility 0s }
.lb-modal__scrim{ position:absolute; inset:0; background:rgba(8,8,8,.55); backdrop-filter:blur(4px) }
.lb-modal__card{ position:relative; z-index:1; width:min(460px,100%); background:var(--lb-surface); color:var(--lb-text); border:var(--lb-border-w) solid var(--lb-border); border-radius:var(--lb-r-lg); padding:clamp(1.4rem,3vw,2rem); box-shadow:var(--lb-shadow-3); transform:scale(.94) translateY(8px); transition:transform var(--lb-d3) var(--lb-spring) }
.lb-modal.open .lb-modal__card{ transform:none }
.lb-modal__title{ font-family:var(--f-display); font-weight:800; font-size:1.4rem; letter-spacing:-.02em; margin-bottom:.6rem }
.lb-modal__body{ color:var(--lb-muted); line-height:1.6 }
.lb-modal__actions{ display:flex; gap:.7rem; justify-content:flex-end; margin-top:1.6rem; flex-wrap:wrap }

/* toasts */
.lb-toasts{ position:fixed; z-index:210; right:clamp(1rem,3vw,1.6rem); bottom:clamp(1rem,3vw,1.6rem); display:flex; flex-direction:column; gap:.6rem; width:min(340px,90vw) }
.lb-toast{ display:flex; align-items:flex-start; gap:.7rem; background:var(--lb-surface); color:var(--lb-text); border:var(--lb-border-w) solid var(--lb-border); border-left:3px solid var(--lb-info); border-radius:var(--lb-r-md); padding:.85rem 1rem; box-shadow:var(--lb-shadow-3); animation:lb-toastin var(--lb-d3) var(--lb-spring); }
.lb-toast.out{ animation:lb-toastout var(--lb-d2) var(--lb-ease-in) forwards }
.lb-toast--success{ border-left-color:var(--lb-success) } .lb-toast--success .lb-toast__ico{ color:var(--lb-success) }
.lb-toast--danger{ border-left-color:var(--lb-danger) } .lb-toast--danger .lb-toast__ico{ color:var(--lb-danger) }
.lb-toast--info{ border-left-color:var(--lb-info) } .lb-toast--info .lb-toast__ico{ color:var(--lb-info) }
.lb-toast__ico{ width:20px; height:20px; flex:none; margin-top:1px } .lb-toast__ico svg{ width:20px; height:20px }
.lb-toast__body{ flex:1; font-size:.9rem; line-height:1.4 } .lb-toast__body b{ font-weight:600 }
.lb-toast__undo{ appearance:none; background:none; border:none; cursor:pointer; font-family:var(--f-mono); font-size:.76rem; color:var(--lb-info); padding:.2rem .2rem; margin-top:.3rem }
.lb-toast__x{ appearance:none; background:none; border:none; cursor:pointer; color:var(--lb-faint); width:22px; height:22px; flex:none } .lb-toast__x svg{ width:16px; height:16px }
@keyframes lb-toastin{ from{ opacity:0; transform:translateX(30px) scale(.96) } to{ opacity:1; transform:none } }
@keyframes lb-toastout{ to{ opacity:0; transform:translateX(30px); height:0; margin:0; padding-block:0 } }

/* ---------- ACCESSIBILITY: contrast checker ---------- */
.cc{ display:grid; grid-template-columns:1fr 1fr; gap:1.2rem 1.6rem; align-items:start }
.cc__inputs{ display:flex; flex-direction:column; gap:1rem }
.cc__pick{ display:flex; align-items:center; gap:.8rem }
.cc__pick label{ font-family:var(--f-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; color:var(--lb-muted); width:64px }
.cc__pick input[type="color"]{ width:44px; height:44px; padding:0; border:var(--lb-border-w) solid var(--lb-border-strong); border-radius:var(--lb-r-md); background:none; cursor:pointer }
.cc__pick input[type="text"]{ flex:1; height:40px }
.cc__preview{ border:var(--lb-border-w) solid var(--lb-border); border-radius:var(--lb-r-md); padding:1.4rem; display:flex; flex-direction:column; gap:.5rem; min-height:150px; justify-content:center }
.cc__preview .big{ font-family:var(--f-display); font-weight:800; font-size:1.6rem; letter-spacing:-.02em }
.cc__preview .small{ font-size:.85rem }
.cc__ratio{ display:flex; align-items:baseline; gap:.6rem; margin-top:.4rem }
.cc__ratio b{ font-family:var(--f-display); font-weight:900; font-size:2.4rem; letter-spacing:-.03em; font-variant-numeric:tabular-nums }
.cc__ratio span{ font-family:var(--f-mono); font-size:.72rem; color:var(--lb-faint) }
.cc__badges{ display:flex; flex-wrap:wrap; gap:.5rem; margin-top:.9rem }

/* touch targets demo */
.tt-row{ display:flex; align-items:center; gap:1.4rem; flex-wrap:wrap }
.tt{ display:flex; flex-direction:column; align-items:center; gap:.5rem; font-family:var(--f-mono); font-size:.66rem; color:var(--lb-faint) }
.tt i{ position:relative; display:flex; align-items:center; justify-content:center; color:var(--lb-text) }
.tt i svg{ width:20px; height:20px }
.tt--ok i{ width:44px; height:44px; border:1px dashed var(--lb-success); border-radius:10px }
.tt--bad i{ width:26px; height:26px; border:1px dashed var(--lb-danger); border-radius:8px }

/* keyboard keys */
.kbd-list{ display:flex; flex-direction:column; gap:.7rem }
.kbd-list li{ display:flex; align-items:center; gap:.9rem; list-style:none; color:var(--lb-muted); font-size:.9rem }
kbd{ font-family:var(--f-mono); font-size:.74rem; background:var(--lb-surface-2); border:var(--lb-border-w) solid var(--lb-border-strong); border-bottom-width:2px; border-radius:6px; padding:.2rem .5rem; color:var(--lb-text); min-width:26px; text-align:center }

/* focus playground */
.focus-demo{ display:flex; flex-wrap:wrap; gap:.7rem; align-items:center }

/* ---------- VARIANTS MATRIX ---------- */
.matrix{ overflow-x:auto; padding-bottom:.5rem }
.matrix table{ border-collapse:collapse; min-width:520px; width:100% }
.matrix th,.matrix td{ padding:.9rem 1rem; text-align:left; border-bottom:var(--lb-border-w) solid var(--lb-border) }
.matrix thead th{ font-family:var(--f-mono); font-size:.68rem; letter-spacing:.14em; text-transform:uppercase; color:var(--lb-faint); font-weight:500 }
.matrix tbody th{ font-family:var(--f-mono); font-size:.74rem; color:var(--lb-muted); font-weight:500; white-space:nowrap }

/* ---------- utility ---------- */
.lab-stack{ display:flex; flex-direction:column; gap:1.4rem }
.lab-2col{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(1rem,2.5vw,1.8rem) }
.lab-back{ display:inline-flex; align-items:center; gap:.5rem; font-family:var(--f-mono); font-size:.8rem; letter-spacing:.06em; text-transform:uppercase; color:var(--lb-muted) }
.lab-back svg{ width:16px; height:16px } .lab-back:hover{ color:var(--lb-text) }
.lab-foot{ border-top:var(--lb-border-w) solid var(--lb-border); margin-top:clamp(2rem,5vh,4rem); padding-block:2.4rem; display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap; font-family:var(--f-mono); font-size:.74rem; color:var(--lb-faint) }
.sr-only{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0 }

@media (max-width:820px){
  .lab-2col,.cc{ grid-template-columns:1fr }
  .lab-controls{ border-radius:var(--lb-r-lg); flex-direction:column; align-items:flex-start; padding:1rem 1.1rem }
}
@media (prefers-reduced-motion: reduce){
  .lab-body *{ animation-duration:.001ms !important; transition-duration:.001ms !important }
}