/* =========================================================================
   UnderKB — hand-written CSS, no framework.
   1. Tokens   2. Reset   3. Layout   4. Components   5. Content   6. Utilities
   ========================================================================= */

/* ---- 1. Tokens ---------------------------------------------------------- */
:root{
  --paper:#EDEEF0;
  --surface:#FFFFFF;
  --ink:#101215;
  --ink-70:#3F454E;
  --ink-45:#5A6169;
  --line:#D9DCE1;
  --mag:#E5007E;
  --mag-ink:#B80065;
  --mag-soft:#FCE9F2;
  --cy-soft:#E3F3FA;
  --dot:#C3CBD2;

  --r-sm:9px;
  --r-md:12px;
  --r-lg:16px;
  --r-pill:999px;

  --wrap:72rem;
  --tap:44px;

  --font-display:"Space Grotesk",system-ui,sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

/* ---- 2. Reset ----------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,p,dl,dd,figure{margin:0}
ul{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit}
button,input,select{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer;text-align:inherit}
[hidden]{display:none !important}

h1,h2,h3{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em;line-height:1.15}

/* ---- 3. Layout ---------------------------------------------------------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:16px}
@media (min-width:640px){.wrap{padding-inline:24px}}

.site-header{
  position:sticky;top:0;z-index:40;
  border-bottom:1px solid var(--line);
  background:rgba(237,238,240,.85);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.site-header__bar{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}

.brand{display:flex;align-items:center;gap:10px;flex:none;text-decoration:none}
.brand__name{font-family:var(--font-display);font-size:17px;font-weight:700;letter-spacing:-.02em}

.tabs{min-width:0;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs ul{display:flex;align-items:center;gap:4px}
.tab{
  display:block;white-space:nowrap;
  padding:8px 14px;border-radius:var(--r-pill);
  font-family:var(--font-display);font-size:13px;font-weight:500;
  color:var(--ink-70);text-decoration:none;
}
.tab[aria-current]{background:var(--ink);color:#fff}
.tab:disabled{color:rgba(90,97,105,.7);cursor:not-allowed}
.tab--soon{display:none}
@media (min-width:640px){.tab--soon{display:block}}

/* ---- 4. Components ------------------------------------------------------ */

/* Hero */
.hero{padding:40px 0 24px}
@media (min-width:640px){.hero{padding-top:56px}}
.eyebrow{
  font-family:var(--font-display);font-size:12px;font-weight:500;
  text-transform:uppercase;letter-spacing:.14em;color:var(--mag-ink);
}
.hero h1{margin-top:8px;font-size:2rem;line-height:1.1}
@media (min-width:640px){.hero h1{font-size:3rem}}
.hero__lead{margin-top:16px;max-width:42rem;font-size:17px;color:var(--ink-70)}
.br-wide{display:none}
@media (min-width:640px){.br-wide{display:inline}}

/* Drop zone */
.drop{
  margin-top:28px;padding:24px;text-align:center;
  border:2px dashed var(--line);border-radius:var(--r-lg);
  background-color:var(--surface);
  background-image:radial-gradient(var(--dot) 1px,transparent 1px);
  background-size:14px 14px;
  transition:border-color .2s ease,background-color .2s ease,transform .2s ease;
}
@media (min-width:640px){.drop{padding:40px}}
.drop.is-over{border-color:var(--mag);background-color:var(--mag-soft);transform:scale(1.005)}
.drop__icon{margin:0 auto}
.drop__title{margin-top:12px;font-family:var(--font-display);font-size:17px;font-weight:500}
.drop__hint{margin-top:4px;font-size:14px;color:var(--ink-45)}
.drop__pick{margin-top:20px}
.drop__compact{display:none;min-width:0;font-family:var(--font-display);font-size:14px;font-weight:500}
.drop__compact span{font-weight:400;color:var(--ink-45)}
/* Once files are loaded the zone gets out of the way of the results. */
.drop.is-compact{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 10px 10px 16px;text-align:left;background-image:none;
}
.drop.is-compact .drop__full{display:none}
.drop.is-compact .drop__compact{display:block}
.drop.is-compact .drop__pick{margin-top:0;min-height:var(--tap);padding:0 18px;font-size:14px}

.notice{margin-top:12px;font-size:14px;color:var(--mag-ink)}

/* Running ledger */
.ledger{
  margin-top:24px;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);
  border-radius:var(--r-md);overflow:hidden;text-align:center;
}
.ledger > div{background:var(--surface);padding:16px 12px}
.ledger dt{font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-45)}
.ledger dd{margin-top:4px;font-size:19px;font-weight:700}
@media (min-width:640px){.ledger dd{font-size:22px}}
.ledger__saved{color:var(--mag-ink)}

/* Settings panel */
.panel{
  margin-top:24px;padding:20px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
}
@media (min-width:640px){.panel{padding:24px}}
.panel__grid{display:grid;gap:24px}
@media (min-width:768px){
  .panel__grid{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:32px}
  .panel__col + .panel__col{border-left:1px solid var(--line);padding-left:32px}
}
.panel__label{margin-bottom:8px;font-family:var(--font-display);font-size:13px;font-weight:500;color:var(--ink-45)}
.panel__note{margin-top:6px;font-size:13px;line-height:1.4;color:var(--ink-45)}
.panel__actions{
  margin-top:20px;padding-top:16px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
}

/* Segmented mode switch */
.seg{
  display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);
}
.seg button{
  min-height:var(--tap);border-radius:var(--r-sm);
  font-family:var(--font-display);font-size:14px;font-weight:500;
  color:var(--ink-45);text-align:center;
  transition:background-color .18s ease,color .18s ease;
}
.seg button:hover{color:var(--ink)}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}

/* Sliders */
.slider + .slider{margin-top:20px}
.slider__head{display:flex;align-items:baseline;justify-content:space-between}
.slider__head label{font-size:14px;font-weight:500}
.slider__head output{font-size:15px;font-weight:700}
input[type=range]{
  -webkit-appearance:none;appearance:none;
  width:100%;height:36px;background:transparent;cursor:pointer;
}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:var(--line)}
input[type=range]::-moz-range-track{height:4px;border-radius:2px;background:var(--line)}
input[type=range]:disabled{opacity:.35;cursor:not-allowed}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:22px;height:22px;margin-top:-9px;
  border-radius:50%;background:var(--ink);border:4px solid #fff;
  box-shadow:0 1px 4px rgba(16,18,21,.28);
}
input[type=range]::-moz-range-thumb{
  width:22px;height:22px;border:4px solid #fff;border-radius:50%;
  background:var(--ink);box-shadow:0 1px 4px rgba(16,18,21,.28);
}

/* Fields */
.field-label{display:block;margin-bottom:6px;font-size:14px;font-weight:500}
.field{
  width:100%;min-height:var(--tap);padding:0 12px;
  border:1px solid var(--line);border-radius:var(--r-sm);
  background:#fff;font-size:15px;color:var(--ink);
}
.field:focus{outline:none;border-color:var(--ink)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field-unit{display:flex;align-items:center;gap:8px}
.field-unit span{font-family:var(--font-display);font-size:15px;color:var(--ink-45)}
.field-group{position:relative;margin-top:16px}
.field-head{display:flex;align-items:center;gap:6px;margin-bottom:6px}
.field-head .field-label{margin-bottom:0}

/* Info tooltip. Anchored to the full field width rather than to the icon, so it can
   never push past the viewport on a narrow screen. */
.tip__btn{
  position:relative;display:grid;place-items:center;
  width:18px;height:18px;border-radius:50%;
  border:1px solid var(--line);background:var(--surface);
  font-family:var(--font-display);font-size:11px;font-weight:700;line-height:1;
  color:var(--ink-45);transition:border-color .18s ease,color .18s ease;
}
.tip__btn::after{content:"";position:absolute;inset:-13px}   /* 44px touch target */
.tip__btn:hover,.tip__btn[aria-expanded="true"]{border-color:var(--ink);color:var(--ink)}
.tip__panel{
  position:absolute;z-index:30;top:100%;left:0;width:100%;max-width:380px;margin-top:8px;
  padding:14px 16px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:0 12px 28px rgba(16,18,21,.16);
}
.tip__title{margin-bottom:8px;font-family:var(--font-display);font-size:13px;font-weight:700}
.tip__panel dl{font-size:13px;line-height:1.5}
.tip__panel dt{font-weight:600;color:var(--ink)}
.tip__panel dd{margin:0 0 8px;color:var(--ink-70)}
.tip__panel dd:last-of-type{margin-bottom:0}
.tip__foot{margin-top:10px;padding-top:10px;border-top:1px solid var(--line);font-size:12px;color:var(--ink-45)}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:var(--tap);padding:0 16px;border-radius:var(--r-md);
  font-family:var(--font-display);font-size:14px;font-weight:500;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .1s ease;
}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn:disabled:active{transform:none}
.btn--primary{background:var(--ink);color:#fff}
.btn--primary:hover:not(:disabled){background:var(--ink-70)}
.btn--accent{background:var(--mag);color:#fff}
.btn--accent:hover:not(:disabled){background:var(--mag-ink)}
.btn--ghost{border:1px solid var(--line);color:var(--ink-45)}
.btn--ghost:hover:not(:disabled){border-color:var(--ink);color:var(--ink)}
.btn--lg{min-height:48px;padding:0 24px;font-size:15px}

.presets{display:flex;flex-wrap:wrap;gap:8px}
.preset{
  min-height:36px;padding:0 14px;
  border:1px solid var(--line);border-radius:var(--r-pill);
  font-family:var(--font-display);font-size:13px;font-weight:500;
  transition:border-color .18s ease;
}
.preset:hover{border-color:var(--ink)}

/* Signature: the weigh bar. Solid magenta is what remains, hatching is what went. */
.weigh{
  position:relative;margin-top:12px;height:10px;border-radius:5px;overflow:hidden;
  background-color:var(--cy-soft);
  background-image:repeating-linear-gradient(135deg,var(--dot) 0 1.5px,transparent 1.5px 6px);
  box-shadow:inset 0 0 0 1px var(--line);
}
.weigh > i{
  position:absolute;inset:0 auto 0 0;display:block;width:0;
  border-radius:5px;background:var(--mag);
  transition:width .45s cubic-bezier(.16,1,.3,1);
}
.weigh--wait{animation:pulse 1.6s cubic-bezier(.4,0,.6,1) infinite}
@keyframes pulse{50%{opacity:.45}}

/* Results */
.results{margin-top:24px;display:grid;gap:12px}
.result{padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg)}
.result__row{display:flex;align-items:flex-start;gap:16px}
.result__thumb{flex:none;border-radius:var(--r-sm)}
.thumb{
  width:64px;height:64px;border-radius:var(--r-sm);object-fit:cover;
  background:var(--paper);box-shadow:inset 0 0 0 1px var(--line);
  cursor:zoom-in;transition:box-shadow .18s ease;
}
.result__thumb:hover .thumb{box-shadow:inset 0 0 0 1px var(--line),0 0 0 3px var(--mag-soft)}
.result__body{min-width:0;flex:1}
.result__name{
  font-family:var(--font-display);font-size:15px;font-weight:500;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.result__stats,.result__wait{margin-top:4px;font-size:13px;color:var(--ink-45)}
.result__err{margin-top:4px;font-size:13px;line-height:1.4;color:var(--mag-ink)}
.result__warn{margin-top:8px;font-size:13px;line-height:1.4;color:var(--mag-ink)}
.result__new{font-weight:700;color:var(--ink)}
.result__pct{margin-left:8px;font-weight:700;color:var(--mag-ink)}
.result__pct.is-flat{color:var(--ink-45)}
.result__meta{margin-top:8px;display:flex;flex-wrap:wrap;gap:6px}
.result__actions{
  margin-top:12px;padding-top:12px;border-top:1px solid var(--line);
  display:flex;align-items:center;gap:8px;
}
.result__actions .btn--primary{flex:1}
@media (min-width:640px){.result__actions .btn--primary{flex:none}}

.chip{
  display:inline-block;padding:2px 8px;border-radius:var(--r-pill);
  font-size:11px;font-weight:500;letter-spacing:.02em;
  background:var(--paper);color:var(--ink-45);border:1px solid var(--line);
}

/* Ad slots. The markup is commented out in index.html until AdSense is approved;
   this rule is kept so uncommenting it is all that's needed. */
.ad-container{
  margin:24px 0;padding:16px;
  border:1px dashed var(--line);border-radius:var(--r-md);
  background:var(--surface);text-align:center;font-size:14px;color:var(--ink-45);
}

/* Dialogs */
dialog{border:0;padding:0;background:transparent;width:100%;max-width:min(46rem,94vw)}
dialog::backdrop{background:rgba(16,18,21,.55)}
.sheet{background:#fff;border-radius:var(--r-lg);max-height:86vh;overflow:auto;padding:24px}
@media (min-width:640px){.sheet{padding:32px}}
.sheet__head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
.sheet__head h2{font-size:1.4rem}
.sheet__close{flex:none;min-width:40px;min-height:40px;border-radius:var(--r-sm);color:var(--ink-45)}
.sheet__close:hover{background:var(--paper)}

#dlg-preview{max-width:min(60rem,94vw)}
.pv__title{min-width:0}
.pv__title h2{font-family:var(--font-display);font-size:15px;font-weight:500;letter-spacing:0;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pv__meta{margin-top:2px;font-size:13px;color:var(--ink-45)}
.pv__frame{margin-top:12px;padding:8px;border:1px solid var(--line);border-radius:var(--r-md)}
.pv__frame img{margin:0 auto;width:auto;max-height:58vh;border-radius:var(--r-sm)}
.pv__actions{margin-top:12px;display:flex;flex-wrap:wrap;gap:8px}
.pv__actions .btn{flex:1}
@media (min-width:640px){.pv__actions .btn{flex:none}}
.checker{
  background-color:#fff;
  background-image:linear-gradient(45deg,#E7E9EC 25%,transparent 25% 75%,#E7E9EC 75%),
                   linear-gradient(45deg,#E7E9EC 25%,transparent 25% 75%,#E7E9EC 75%);
  background-size:18px 18px;background-position:0 0,9px 9px;
}

/* ---- 5. Editorial content ----------------------------------------------- */
.prose{padding:32px 0}
.prose h2{font-size:1.6rem;line-height:1.2}
@media (min-width:640px){.prose h2{font-size:2rem}}
.prose__lead{margin-top:12px;max-width:42rem;font-size:17px;color:var(--ink-70)}
.prose h3{margin:32px 0 8px;font-size:1.0625rem}
.prose p{margin:0 0 16px;max-width:68ch;color:var(--ink-70)}
.prose ul{margin:0 0 16px;padding-left:18px;max-width:68ch;color:var(--ink-70);list-style:disc}
.prose li{margin-bottom:6px}
.prose strong{color:var(--ink);font-weight:600}
.prose code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}
.prose a{color:var(--mag-ink);text-decoration:underline;text-underline-offset:2px}

/* Standalone legal / about documents. Declared after .prose so its headings win. */
.legal{max-width:44rem;padding:40px 0 24px}
.legal h1{margin-bottom:6px;font-size:2rem;line-height:1.15}
.legal__date{margin-bottom:28px;font-size:13px;color:var(--ink-45)}
.legal h2{margin:32px 0 8px;font-family:var(--font-display);font-size:1.125rem;font-weight:700;letter-spacing:-.01em}
.legal p{max-width:none}
.legal ul{max-width:none}
.legal__back{
  display:inline-flex;align-items:center;gap:6px;margin-top:32px;
  font-family:var(--font-display);font-size:14px;font-weight:500;
  color:var(--mag-ink);text-decoration:none;
}
.legal__back:hover{text-decoration:underline;text-underline-offset:3px}
.footer-nav a{
  display:inline-flex;align-items:center;min-height:36px;
  font-family:var(--font-display);font-size:14px;font-weight:500;
  color:var(--ink-70);text-decoration:none;transition:color .18s ease;
}
.footer-nav a:hover{color:var(--mag-ink)}
.footer-nav a[aria-current]{color:var(--mag-ink)}

.faq{padding:24px 0}
.faq h2{font-size:1.5rem}
.faq__list{
  margin-top:20px;overflow:hidden;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
}
.faq__list details + details{border-top:1px solid var(--line)}
.faq summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 20px;cursor:pointer;list-style:none;
  font-family:var(--font-display);font-size:15px;font-weight:500;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--ink-45);transition:transform .18s ease}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{margin:0;padding:0 20px 16px;font-size:15px;color:var(--ink-70)}
.faq strong{font-weight:600;color:var(--ink)}

.site-footer{margin-top:32px;border-top:1px solid var(--line);background:var(--surface)}
.site-footer__inner{display:flex;flex-direction:column;gap:32px;padding:40px 0 0}
@media (min-width:640px){.site-footer__inner{flex-direction:row;align-items:flex-start;justify-content:space-between}}
.site-footer__about{max-width:24rem}
.site-footer__about p{margin-top:12px;font-size:14px;color:var(--ink-45)}
.footer-nav ul{display:grid;grid-template-columns:1fr 1fr;gap:8px 32px}
@media (min-width:640px){.footer-nav ul{grid-template-columns:1fr}}
.footer-nav button{
  min-height:36px;font-family:var(--font-display);font-size:14px;font-weight:500;color:var(--ink-70);
  transition:color .18s ease;
}
.footer-nav button:hover{color:var(--mag-ink)}
.colophon{
  margin-top:32px;padding:24px 0 40px;border-top:1px solid var(--line);
  font-size:13px;color:var(--ink-45);
}
.colophon a{color:var(--mag-ink);font-weight:500;text-decoration:underline;text-underline-offset:2px}

/* ---- 6. Utilities & a11y ------------------------------------------------ */
.num{font-family:var(--font-display);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.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;
}
.skip{position:absolute;left:-9999px;top:0;z-index:60;background:var(--ink);color:#fff;
  padding:12px 16px;border-radius:0 0 var(--r-sm) 0;text-decoration:none}
.skip:focus{left:0}
:where(a,button,input,select,summary,[tabindex]):focus-visible{
  outline:2px solid var(--mag);outline-offset:2px;border-radius:6px;
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}