/* FitMyFace — an optician's fitting room: optician navy, tortoiseshell amber, lens white.
   One typeface (Archivo): the wide cut for headlines, like eye-chart and shop signage; normal cut for text.
   The millimetre ruler is the one recurring device, and it always marks a real measurement. */
:root{
  color-scheme:light;
  --page:#F4F6F8; --card:#FFFFFF; --ink:#1B2340; --ink-2:#2B3663; --steel:#5B6478; --line:#DCE1E9;
  --amber:#C9822F; --amber-tint:#F7EBDD; --good:#1F7A55; --warn:#9A5B12;
  --font:'Archivo',system-ui,-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  --ruler:repeating-linear-gradient(90deg,var(--amber) 0 1px,transparent 1px 6px);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--page);color:var(--ink);font:400 17px/1.55 var(--font);-webkit-tap-highlight-color:transparent}
button,select,input{font:inherit;color:inherit}
a{color:var(--ink)}
img{display:block;max-width:100%}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- header / footer ---------- */
.top,main,footer{width:100%;max-width:1120px;margin:0 auto;padding-left:20px;padding-right:20px}
.top{display:flex;align-items:center;justify-content:space-between;padding-top:max(14px,env(safe-area-inset-top));padding-bottom:6px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-stretch:125%;font-size:19px;letter-spacing:-.01em}
.mark{width:38px;height:22px;fill:none;stroke:var(--ink);stroke-width:2.6;stroke-linecap:round}
.mark .lens2{stroke:var(--amber)}
.top-actions{display:flex;gap:8px}
.chip-btn{border:1px solid var(--line);background:var(--card);border-radius:999px;padding:7px 14px;font-size:14px;cursor:pointer}
footer{padding-top:40px;padding-bottom:calc(32px + env(safe-area-inset-bottom));color:var(--steel);font-size:14px}
footer p{margin:4px 0}

/* ---------- type ---------- */
h1,h2,h3{margin:0;letter-spacing:-.02em;line-height:1.05}
h1{font-size:clamp(36px,6.4vw,62px);font-weight:800;font-stretch:125%}
h2{font-size:clamp(24px,3.4vw,32px);font-weight:800;font-stretch:118%;margin:6px 0 14px}
.lead{font-size:clamp(17px,2vw,19px);color:var(--steel);max-width:34em;margin:16px 0 0}
.note{font-size:14px;color:var(--steel);max-width:40em}

/* ---------- buttons ---------- */
button.primary,button.secondary,a.buy,.ghost{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 20px;border-radius:12px;font-weight:700;font-size:16px;cursor:pointer;text-decoration:none;border:1.5px solid transparent;transition:background .15s,color .15s}
button.primary,a.buy{background:var(--ink);color:#fff}
button.primary:hover,a.buy:hover{background:var(--ink-2)}
button.primary:disabled{opacity:.35;cursor:default}
button.secondary{background:var(--card);color:var(--ink);border-color:var(--ink)}
button.secondary:hover{background:#E9EDF3}
.ghost{background:none;color:var(--ink);padding:0 12px}
.ghost:hover{background:#E6EAF0}
.link{background:none;border:0;padding:12px 0;font-weight:700;color:var(--ink);text-decoration:underline;text-decoration-color:var(--amber);text-decoration-thickness:2px;text-underline-offset:5px;cursor:pointer}
.back{display:inline-flex;align-items:center;gap:6px;background:none;border:0;color:var(--steel);font-size:15px;padding:8px 0;cursor:pointer}
.back::before{content:'';width:8px;height:8px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg)}
.row{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}

/* ---------- home ---------- */
#home{display:grid;gap:24px;padding-top:18px}
.hero-text{max-width:620px}
.fitting{position:relative;margin:0;border-radius:28px;overflow:hidden;background:var(--ink);box-shadow:0 40px 70px -40px rgba(27,35,64,.55)}
.fitting canvas{display:block;width:100%;height:auto;aspect-ratio:5/4;object-fit:cover}
.fitting-pd{position:absolute;top:14px;left:14px;display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.94);border-radius:999px;padding:6px 12px 6px 10px;font-size:14px;font-weight:600;font-variant-numeric:tabular-nums}
.fitting-pd::before{content:'';width:22px;height:9px;background:var(--ruler);border-bottom:1.5px solid var(--amber)}
.fitting-cap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px 16px;color:#fff}
.fitting-cap b{display:block;font-size:15px;line-height:1.25}
.fitting-cap small{color:#AEB6CC;font-size:13px;font-variant-numeric:tabular-nums}
.fitting-cap .price{font-size:24px;font-weight:800;font-stretch:112%;white-space:nowrap;color:#E9A957}

.paths{display:grid;gap:14px}
.path{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:16px;width:100%;text-align:left;padding:18px;border-radius:20px;cursor:pointer;font-size:15px;line-height:1.4}
.path b{display:block;font-size:20px;font-weight:800;font-stretch:115%;margin-bottom:3px}
.path-glasses{position:relative;overflow:hidden;background:var(--ink);color:#DDE3F2;border:0;padding-bottom:26px}
.path-glasses b{color:#fff}
.path-glasses::after{content:'';position:absolute;left:18px;right:18px;bottom:10px;height:8px;background:var(--ruler);opacity:.9}
.path-glasses svg{width:58px;height:34px;fill:none;stroke:var(--amber);stroke-width:2.4;stroke-linecap:round}
.path-hair{background:var(--card);color:var(--steel);border:1.5px solid var(--line)}
.path-hair b{color:var(--ink)}
.path-hair:hover{border-color:var(--ink)}
.path-pics{display:flex;width:84px;height:62px;border-radius:12px;overflow:hidden}
.path-pics img{width:50%;height:100%;object-fit:cover}
.path-pics img+img{border-left:2px solid #fff}
.trust{margin:18px 0 0;font-size:15px;color:var(--steel)}
.steps{list-style:none;counter-reset:step;padding:0;margin:8px 0 0;display:grid;gap:12px}
.steps li{counter-increment:step;display:grid;grid-template-columns:40px 1fr;gap:12px;align-items:baseline;font-size:16px}
.steps li::before{content:counter(step);font-weight:800;font-stretch:125%;font-size:26px;color:var(--amber);line-height:1}
.hook{background:var(--amber-tint);border-radius:16px;padding:16px 18px;margin:0;font-size:16px}
@media (min-width:900px){
  #home{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);column-gap:56px;row-gap:28px;align-items:start;padding-top:36px}
  .hero-text{grid-column:1;grid-row:1}
  .hero-actions{grid-column:1;grid-row:2}
  .fitting{grid-column:2;grid-row:1 / span 2}
  .fitting canvas{aspect-ratio:1/1}
  .home-more{grid-column:1 / -1;display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:start;margin-top:12px}
}

/* ---------- scan ---------- */
#scan,.narrow{max-width:560px;margin:0 auto}
.stage{position:relative;border-radius:24px;overflow:hidden;background:var(--ink);aspect-ratio:3/4;width:100%}
.stage video{display:none}
.stage canvas{display:block;width:100%;height:100%;object-fit:cover}

canvas.mirror{transform:scaleX(-1)}
.guide{position:absolute;inset:13% 21% 19%;border:2px dashed rgba(255,255,255,.5);border-radius:50% 50% 46% 46%;pointer-events:none;transition:border-color .2s}
.stage.has-face .guide{border-style:solid;border-color:var(--amber)}
.status{position:absolute;left:0;right:0;bottom:0;margin:0;padding:12px 16px;background:linear-gradient(transparent,rgba(16,20,38,.78));color:#fff;font-weight:600;min-height:46px}
.status:empty{display:none}
.tips{font-size:15px;color:var(--steel);margin:12px 0 0}
.check{display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:12px 0;cursor:pointer;font-size:15px}
.check input{width:20px;height:20px;margin:2px 0 0;flex:none;accent-color:var(--ink)}

/* ---------- results layout ---------- */
.results{display:grid;grid-template-columns:minmax(0,1fr);gap:22px}
.col-stage,.col-list{min-width:0}
@media (min-width:900px){
  .results{grid-template-columns:minmax(0,1fr) minmax(0,1fr);column-gap:40px;align-items:start}
  .col-stage{position:sticky;top:16px}
}
.stage.result{aspect-ratio:3/4}
.nav{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;border:0;background:rgba(255,255,255,.92);cursor:pointer;display:grid;place-items:center}
.nav::before{content:'';width:10px;height:10px;border-left:2.5px solid var(--ink);border-bottom:2.5px solid var(--ink);transform:translateX(2px) rotate(45deg)}
.nav.next::before{transform:translateX(-2px) rotate(-135deg)}
.nav.prev{left:10px}.nav.next{right:10px}
.now{position:absolute;left:12px;right:12px;bottom:12px;margin:0;padding:10px 14px;border-radius:14px;background:rgba(255,255,255,.95);font-size:15px;font-weight:600}
.now:empty{display:none}
.seg{display:inline-flex;background:#E4E8EF;border-radius:12px;padding:3px}
.seg button{border:0;background:none;padding:8px 14px;border-radius:9px;cursor:pointer;font-size:15px;font-weight:600;color:var(--steel)}
.seg button[aria-pressed=true]{background:var(--ink);color:#fff}
.live-toggle{position:absolute;top:12px;right:12px;background:rgba(255,255,255,.92)}

/* measurement slip */
.slip{position:relative;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px 18px 16px;margin:16px 0}
.slip::before{content:'';position:absolute;left:18px;right:18px;top:0;height:9px;background:var(--ruler);border-top:1.5px solid var(--amber)}
.slip h3{font-size:15px;font-weight:700;color:var(--steel);letter-spacing:0;margin-bottom:8px}
.shapes{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 6px}
.shapes button{border:1.5px solid var(--line);background:var(--card);border-radius:999px;padding:6px 13px;cursor:pointer;font-size:15px}
.shapes button[aria-pressed=true]{border-color:var(--ink);background:var(--ink);color:#fff}
.shapes button small{opacity:.7;margin-left:5px;font-variant-numeric:tabular-nums}
.hint{font-size:13px;color:var(--steel);margin:2px 0 0}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px;border-top:1px solid var(--line);padding-top:12px}
.stats b{display:block;font-size:22px;font-weight:800;font-stretch:115%;font-variant-numeric:tabular-nums;line-height:1.15}
.stats span{font-size:13px;color:var(--steel)}
.warn{color:var(--warn);font-size:14px}
.filters{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:12px 0}
.filters label{display:flex;align-items:center;gap:8px;font-size:15px;color:var(--steel)}
.filters select{padding:9px 12px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-weight:600}
.goal{border-left:3px solid var(--amber);padding:2px 0 2px 14px;margin:6px 0 14px;font-size:16px}

/* ---------- cards ---------- */
.cards{list-style:none;padding:0;margin:14px 0;display:grid;gap:12px}
.card{background:var(--card);border:1.5px solid var(--line);border-radius:18px;padding:16px}
.card.on{border-color:var(--ink)}
.card .head{display:grid;grid-template-columns:118px minmax(0,1fr);gap:14px;align-items:center}
.card canvas{width:118px;height:52px;background:var(--page);border-radius:12px}
.card h4{margin:0;font-size:17px;line-height:1.25}
.card .sub{margin:2px 0 0;font-size:14px;color:var(--steel)}
.card .row-price{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-top:12px}
.card .price{font-size:24px;font-weight:800;font-stretch:112%;font-variant-numeric:tabular-nums}
.match{font-size:13px;font-weight:700;background:var(--amber-tint);color:var(--warn);border-radius:999px;padding:3px 10px;white-space:nowrap}
.card .size{margin:2px 0 0;font-size:14px;font-variant-numeric:tabular-nums}
.card .pnote{margin:2px 0 0;font-size:13px;color:var(--steel)}
.fit{list-style:none;padding:0;margin:10px 0 0;display:grid;gap:3px;font-size:14px}
.fit li{display:grid;grid-template-columns:16px 1fr;gap:6px}
.fit li::before{content:'✓';font-weight:800;color:var(--good)}
.fit li.warn::before{content:'!';color:var(--warn);text-align:center}
.card .actions{display:grid;grid-template-columns:1fr 1.3fr;gap:8px;margin-top:14px}
.card .actions > *{min-height:44px;font-size:15px;padding:0 12px}
.hair-card .actions{grid-template-columns:1fr 1fr}
.hair-card .actions .ghost{grid-column:1 / -1;min-height:36px}
.zh{color:var(--steel);font-size:14px;margin:2px 0 0}
.badges{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 0}
.badge{font-size:13px;padding:3px 10px;border-radius:999px;background:#E9EDF4;color:var(--ink-2);font-weight:600}
.badge.good{background:#E3F2EA;color:var(--good)}

/* ---------- hair studio ---------- */
.studio{position:relative;border-radius:24px;overflow:hidden;background:var(--ink);user-select:none;-webkit-user-select:none}
.studio canvas{display:block;width:100%;height:auto;cursor:grab;touch-action:none}
.studio canvas:active{cursor:grabbing}
.studio .live-toggle{top:auto;bottom:62px}
.drag-hint{position:absolute;top:12px;left:50%;transform:translateX(-50%);margin:0;padding:7px 14px;border-radius:999px;background:rgba(16,20,38,.72);color:#fff;font-size:14px;white-space:nowrap;pointer-events:none;transition:opacity .4s}
.drag-hint.gone{opacity:0}
.swatches{display:flex;gap:10px;overflow-x:auto;padding:14px 2px 6px;scrollbar-width:none}
.swatches button{flex:none;display:flex;flex-direction:column;align-items:center;gap:4px;border:0;background:none;cursor:pointer;font-size:12px;color:var(--steel)}
.swatches i{width:38px;height:38px;border-radius:50%;border:3px solid var(--card);box-shadow:0 0 0 1px var(--line)}
.swatches button[aria-checked=true] i{box-shadow:0 0 0 2.5px var(--ink)}
.swatches button[aria-checked=true]{color:var(--ink);font-weight:700}
.sliders{display:grid;gap:8px;margin:8px 0}
.sliders label{display:grid;grid-template-columns:64px 1fr;align-items:center;gap:12px;font-size:15px;color:var(--steel)}
.sliders input{width:100%;accent-color:var(--amber)}

/* ---------- dialogs ---------- */
dialog{border:0;border-radius:22px;padding:20px;width:min(520px,calc(100vw - 24px));max-height:calc(100vh - 24px);overflow:auto;color:var(--ink)}
dialog::backdrop{background:rgba(16,20,38,.55)}
dialog h3{font-size:22px;font-stretch:115%;margin-bottom:12px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pair figure{margin:0}
.pair img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:14px;background:#E9EDF3}
.pair figcaption{text-align:center;font-size:14px;color:var(--steel);margin-top:4px}
dialog .status{position:static;background:none;color:var(--ink);padding:8px 0;min-height:0}
.spinner{width:100%;aspect-ratio:1;border-radius:14px;background:linear-gradient(90deg,#E9EDF3,#F7F8FA,#E9EDF3);background-size:200% 100%;animation:sh 1.2s infinite}
@keyframes sh{to{background-position:-200% 0}}
#cardCanvas{width:100%;height:auto;border-radius:14px;border:1px solid var(--line)}