/* Color Vision Helper — mobile-first UI.
   Selected states are shown by luminance inversion + weight (never by hue alone),
   because the people using this app may not tell hues apart.

   One visual system:
   - shapes: containers are rounded rectangles (sheet 24, panel 18, control 12, tag 8 px);
     choices and toggles are pills; icon buttons are circles. Nothing is square except the
     picture in "fill" framing.
   - type: every text size comes from the scale below and follows the user's text-size setting
     (--fs); the top bar keeps its size so both switches always fit.
   - touch: buttons are at least 40 px tall (44 px for the main ones). */
:root {
  --bg: #0e1116;
  --panel: rgba(20, 24, 32, 0.84);
  --panel-solid: #171c25;
  --raise: rgba(255, 255, 255, 0.07);
  --raise-2: rgba(255, 255, 255, 0.12);
  --line: rgba(255, 255, 255, 0.14);
  --line-2: rgba(255, 255, 255, 0.24);
  --text: #f3f5f8;
  --muted: #b4bcc7;
  --sel-bg: #f3f5f8;
  --sel-text: #0e1116;
  --accent: #ffd54a;
  --accent-text: #1b1500;
  --focus: #ffd54a;
  --r-sheet: 24px; --r-panel: 18px; --r-ctl: 12px; --r-tag: 8px; --r-pill: 999px;
  --fs: 1;
  --t-xs: calc(12px * var(--fs));
  --t-s: calc(13px * var(--fs));
  --t-m: calc(14px * var(--fs));
  --t-b: calc(15px * var(--fs));
  --t-l: calc(17px * var(--fs));
  --t-xl: calc(20px * var(--fs));
  --t-name: calc(24px * var(--fs));
  --blur: blur(16px) saturate(1.15);
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
  color-scheme: dark;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); overflow: hidden; }
body {
  font: 400 var(--t-b)/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Roboto, sans-serif;
  overscroll-behavior: none; touch-action: none; user-select: none; -webkit-user-select: none;
}
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
button:disabled { opacity: 0.35; cursor: default; }
button:focus-visible, input:focus-visible, summary:focus-visible, a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
[hidden] { display: none !important; }
.ic { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.ic-s { width: 15px; height: 15px; vertical-align: -3px; margin-right: 3px; }

/* ---------- picture ---------- */
#app { position: fixed; inset: 0; overflow: hidden; }
#video, #view, #overlay { position: absolute; inset: 0; width: 100%; height: 100%; }
#video { object-fit: cover; z-index: 0; }
#view { z-index: 1; background: var(--bg); }
#overlay { z-index: 2; pointer-events: none; }
/* rounded corners for the picture in "fit" framing: a mask the colour of the background */
#frame { position: absolute; z-index: 2; pointer-events: none; border-radius: var(--r-panel); box-shadow: 0 0 0 100vmax var(--bg); }

/* ---------- reticle ---------- */
#reticle { position: absolute; z-index: 3; width: 0; height: 0; left: 50%; top: 50%; pointer-events: none; }
#reticle .ret-svg { position: absolute; left: 0; top: 0; transform: translate(-50%, -50%); overflow: visible; }
.ret-svg g { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.ret-svg .halo { stroke: rgba(0, 0, 0, 0.6); stroke-width: 3.6px; }
.ret-svg .line { stroke: #fff; stroke-width: 1.6px; }
.ret-svg path, .ret-svg circle { vector-effect: non-scaling-stroke; }
.ret-svg .halo .fill { fill: rgba(0, 0, 0, 0.6); }
.ret-svg .line .fill { fill: #fff; }
#reticle .ring {
  display: none; position: absolute; left: 0; top: 0; width: 34px; height: 34px; margin: -17px 0 0 -17px;
  border-radius: 50%; border: 2.5px solid #fff; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.75), inset 0 0 0 1px rgba(0, 0, 0, 0.75);
}
.mode-correct #reticle, .mode-correct #btnRecenter { display: none !important; }
#reticle .tip {
  display: none; position: absolute; left: 0; bottom: 28px; transform: translateX(-50%); white-space: nowrap;
  padding: 5px 12px; border-radius: var(--r-pill); font-size: var(--t-s); font-weight: 700; background: rgba(0, 0, 0, 0.72); border: 1px solid var(--line);
}

/* white-balance / light panel open: no colour ID, just the target for the white card */
.wb-open #card, .wb-open .range-ctl, .wb-open #correctPanel, .wb-open #btnRecenter, .wb-open #splitLabels, .wb-open #hint { display: none !important; }
.wb-open #reticle { display: block !important; }
.wb-open.wb-manual #reticle .ring { display: block; }
.wb-open.wb-manual #retShape { display: none; }
.wb-open.wb-manual #reticle .tip { display: block; }

/* focusing: a pulsing ring at the focus point */
#afRing {
  position: absolute; z-index: 3; width: 58px; height: 58px; margin: -29px 0 0 -29px; pointer-events: none;
  border-radius: 50%; border: 2.5px solid var(--accent); box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6);
  animation: af-pulse 0.8s ease-in-out infinite;
}
@keyframes af-pulse { 50% { transform: scale(0.78); opacity: 0.55; } }
@media (prefers-reduced-motion: reduce) { #afRing { animation: none; } }

#splitLabels { position: absolute; z-index: 3; top: calc(var(--safe-t) + 64px); left: 0; right: 0; pointer-events: none; }
#splitLabels span { position: absolute; top: 0; padding: 4px 10px; border-radius: var(--r-pill); font-size: var(--t-xs); font-weight: 700; background: rgba(0, 0, 0, 0.62); border: 1px solid var(--line); }
#splitLabels span:first-child { right: calc(100% - var(--split, 50%) + 8px); }
#splitLabels span:last-child { left: calc(var(--split, 50%) + 8px); }

/* ---------- top bar: scene (real / screen) and mode (identify / correct) ---------- */
.topbar {
  position: absolute; z-index: 5; top: 0; left: 0; right: 0;
  padding: calc(var(--safe-t) + 8px) calc(var(--safe-r) + 10px) 8px calc(var(--safe-l) + 10px);
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
}
.top-left { display: flex; gap: 6px; align-items: center; min-width: 0; }
.top-actions { display: flex; gap: 6px; flex: none; }
.seg { display: inline-flex; background: var(--panel); border: 1px solid var(--line); border-radius: var(--r-pill); padding: 3px; backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }
.seg > button { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 14px; border-radius: var(--r-pill); color: var(--muted); font-weight: 650; white-space: nowrap; }
.seg > button[aria-selected="true"], .seg > button.on { background: var(--sel-bg); color: var(--sel-text); font-weight: 750; }
.scene-switch > button, .mode-switch > button { min-height: 38px; padding: 6px 12px; font-size: 14.5px; }
.scene-switch .ic, .mode-switch .ic { width: 18px; height: 18px; }
.scene-switch > button[aria-selected="true"] { background: var(--accent); color: var(--accent-text); }
.icon-btn, .chip-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-width: 44px; height: 44px;
  border-radius: var(--r-pill); background: var(--panel); border: 1px solid var(--line); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
}
.chip-btn { padding: 0 14px; font-weight: 650; white-space: nowrap; font-size: var(--t-m); }
.icon-btn.sm { min-width: 36px; height: 36px; }
.icon-btn.sm .ic { width: 19px; height: 19px; }
.topbar .icon-btn, .topbar .chip-btn { height: 44px; min-width: 44px; font-size: 14px; }
.topbar .ic { width: 20px; height: 20px; }
/* the language switch sits in Settings; on wide screens it is in the top bar too */
@media (max-width: 519px) { .lang-top { display: none !important; } }
@media (max-width: 400px) {
  .topbar { padding-left: calc(var(--safe-l) + 8px); padding-right: calc(var(--safe-r) + 8px); }
  .scene-switch .ic, .mode-switch .ic { display: none; }
  .scene-switch > button, .mode-switch > button { padding: 6px 11px; }
}
@media (max-width: 350px) { .scene-switch > button, .mode-switch > button { padding: 6px 8px; font-size: 13.5px; } }

/* ---------- floating controls on the picture ---------- */
.float-btn {
  position: absolute; z-index: 5; right: calc(var(--safe-r) + 12px); top: calc(var(--safe-t) + 64px);
  display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 0 14px; border-radius: var(--r-pill);
  background: var(--panel); border: 1px solid var(--line); font-size: var(--t-s); font-weight: 650; backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
}
.float-btn .ic { width: 18px; height: 18px; }
#hud { position: absolute; z-index: 6; left: 50%; transform: translateX(-50%); top: calc(var(--safe-t) + 70px); padding: 8px 16px; border-radius: 16px; background: rgba(0, 0, 0, 0.78); border: 1px solid var(--line); font-weight: 700; font-size: var(--t-m); line-height: 1.35; text-align: center; pointer-events: none; width: max-content; max-width: min(92vw, 440px); }
.zoom-chips { position: absolute; z-index: 4; transform: translateY(-50%); display: flex; flex-direction: column; gap: 4px; padding: 4px; border-radius: var(--r-pill); background: rgba(0, 0, 0, 0.45); border: 1px solid var(--line); }
.zoom-chips button { width: 40px; height: 40px; padding: 0; border-radius: 50%; font-size: 13px; font-weight: 800; color: var(--text); background: rgba(255, 255, 255, 0.1); }
.zoom-chips button.on { background: var(--sel-bg); color: var(--sel-text); }
.range-ctl { position: absolute; z-index: 4; transform: translateY(-50%); display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 4px 0; width: 36px; border-radius: var(--r-pill); background: rgba(0, 0, 0, 0.36); }
.rc-btn { width: 36px; min-height: 40px; padding: 2px 0; border-radius: var(--r-pill); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0; }
.rc-btn span { font-size: 11px; font-weight: 800; line-height: 1.1; text-shadow: 0 0 3px rgba(0, 0, 0, 0.8); }
.rc-btn .ic { width: 20px; height: 20px; stroke-width: 1.8; }
.rc-track { position: relative; width: 36px; height: min(20vh, 150px); touch-action: none; cursor: ns-resize; }
.rc-track::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 3px; margin-left: -1.5px; border-radius: 2px; background: rgba(255, 255, 255, 0.3); }
.rc-fill { position: absolute; left: 50%; bottom: 0; width: 3px; margin-left: -1.5px; border-radius: 2px; background: #fff; }
.rc-knob { position: absolute; left: 50%; width: 18px; height: 18px; margin-left: -9px; border-radius: 50%; background: #fff; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.45), 0 1px 3px rgba(0, 0, 0, 0.6); }
.mode-correct .range-ctl { display: none !important; }

/* ---------- bottom stack: hint strip, colour card / correction panel, toolbar ---------- */
.bottom {
  position: absolute; z-index: 5; left: 0; right: 0; bottom: 0;
  padding: 0 calc(var(--safe-r) + 8px) calc(var(--safe-b) + 8px) calc(var(--safe-l) + 8px);
  display: flex; flex-direction: column; gap: 8px; pointer-events: none;
  background: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.5) 36%);
}
.bottom > * { pointer-events: auto; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r-panel); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }

/* hint strip: a hint (closable) or a step that needs the user (no close button) */
/* × sits outside the wrapping part, so it never drops onto a line of its own; the action button
   shares the text's line when both fit and moves under the text when they do not */
.hint {
  display: flex; align-items: flex-start; gap: 2px; min-height: 48px; padding: 4px 4px 4px 2px;
  border-radius: var(--r-panel); background: var(--panel); border: 1px solid var(--line); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
}
.hint.step { border-color: rgba(255, 213, 74, 0.6); box-shadow: inset 3px 0 0 var(--accent); }
.hint-body { flex: 1 1 auto; min-width: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 2px 6px; }
.hint-text { flex: 1 1 120px; min-width: 0; display: flex; align-items: center; gap: 8px; min-height: 40px; padding: 4px 6px 4px 10px; text-align: left; border-radius: var(--r-ctl); font-size: var(--t-m); font-weight: 650; line-height: 1.3; }
.hint.stack .hint-text { flex-basis: 100%; } /* the text needs more than two lines beside the button: button below */
.hint-text .ic { width: 18px; height: 18px; color: var(--muted); }
#hintLine { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.hint-actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; margin-left: auto; max-width: 100%; }
.hint-actions:empty { display: none; }
.hint-close { flex: none; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; color: var(--muted); }
.hint-close .ic { width: 18px; height: 18px; }
.act-btn {
  flex: none; max-width: 100%; overflow: hidden; text-overflow: ellipsis; min-height: 40px; padding: 0 14px; border-radius: var(--r-pill); border: 1px solid var(--line);
  background: var(--raise-2); font-size: var(--t-m); font-weight: 700; white-space: nowrap;
}
.act-btn.primary-sm, .act-btn.on { background: var(--sel-bg); color: var(--sel-text); border-color: var(--sel-bg); }

/* colour card */
#card { display: flex; flex-direction: column; gap: 6px; padding: 10px 10px 8px 12px; }
.card-main { display: flex; align-items: center; gap: 12px; }
#swatch { width: 56px; height: 56px; border-radius: var(--r-ctl); flex: none; border: 2px solid rgba(255, 255, 255, 0.85); box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6); background: #333; }
#card.tc-card #swatch { border-style: double; border-width: 4px; }
.card-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1px; }
/* The card keeps the same height while the reading changes: every line is one line high with a fixed
   line box, a text that is too long is shrunk a little (main.js setFitted) instead of wrapping, and
   the message line is kept even when it is empty. */
.name { --ns: var(--t-name); font-size: var(--ns); font-weight: 800; letter-spacing: 0.01em; line-height: calc(var(--ns) * 1.22); height: calc(var(--ns) * 1.22); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.alt { font-size: var(--t-m); color: var(--muted); font-weight: 600; line-height: calc(var(--t-m) * 1.32); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.alt:empty, .sub:empty { display: none; }
.sub { font-size: var(--t-s); color: var(--muted); font-variant-numeric: tabular-nums; line-height: calc(var(--t-s) * 1.36); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.sub .hex { color: var(--text); font-weight: 650; text-decoration: underline dotted; text-underline-offset: 3px; cursor: pointer; }
#card #btnSpeak { min-width: 44px; height: 44px; align-self: flex-start; }
.msgs { font-size: var(--t-s); line-height: calc(var(--t-s) * 1.4); height: calc(var(--t-s) * 1.4); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.tc-amb { color: var(--accent); font-weight: 750; }
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.status { flex: 1 1 auto; min-width: 0; display: flex; }
.tag-chip {
  display: inline-flex; align-items: center; gap: 6px; max-width: 100%; min-height: 36px; padding: 0 12px 0 9px;
  border-radius: var(--r-pill); background: var(--raise); border: 1px solid var(--line); font-size: var(--t-s); font-weight: 700; text-align: left;
}
.tag-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tag-chip .ic { width: 16px; height: 16px; color: var(--muted); }
/* confidence as filled / hollow dots (shape, not colour) */
.conf { display: inline-flex; gap: 3px; margin-left: 2px; }
.conf i { width: 7px; height: 7px; border-radius: 50%; border: 1.5px solid currentColor; }
.conf i.on { background: currentColor; }
.name-set { flex: none; display: flex; align-items: center; gap: 6px; }
.name-set-lbl { font-size: var(--t-xs); font-weight: 700; color: var(--muted); }
.seg-mini { flex: none; padding: 2px; }
.seg-mini > button { padding: 0 10px; font-size: min(var(--t-s), 15px); min-height: 34px; }

/* toolbar */
.toolbar { display: flex; justify-content: space-between; gap: 6px; }
.toolbar > button {
  position: relative; flex: 1; min-width: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; padding: 6px 4px; min-height: 56px;
  border-radius: 14px; background: var(--panel); border: 1px solid var(--line); font-size: min(calc(12.5px * var(--fs)), 14px); font-weight: 650;
  backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
}
.toolbar > button span { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.toolbar > button.on { background: var(--sel-bg); color: var(--sel-text); }
.badge { position: absolute; top: 4px; right: 5px; font-style: normal; font-size: 10px; font-weight: 800; line-height: 1; padding: 2px 5px; border-radius: 6px; background: rgba(255, 255, 255, 0.92); color: var(--bg); }
.toolbar > button.on .badge { background: var(--bg); color: var(--text); }

/* correction panel (Correct mode) */
#correctPanel { display: none; overflow: hidden; }
.mode-correct #correctPanel { display: block; }
.mode-correct #card { display: none; }
.cp-head { display: flex; align-items: center; gap: 6px; padding: 5px 6px 5px 4px; }
.cp-sum { flex: 1; min-width: 0; display: flex; align-items: center; justify-content: space-between; gap: 6px; min-height: 44px; padding: 0 8px 0 10px; font-weight: 750; font-size: var(--t-b); text-align: left; border-radius: var(--r-ctl); }
#cpSummary { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cp-head .chev { transition: transform 0.2s; }
#correctPanel.collapsed .cp-body { display: none; }
#correctPanel.collapsed .chev { transform: rotate(180deg); }
.cp-body { padding: 2px 12px 12px; display: flex; flex-direction: column; gap: 10px; max-height: min(36vh, 300px); overflow-y: auto; touch-action: pan-y; }
/* a faded bottom edge says "more below" when the panel body scrolls */
.cp-body.more { -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 28px), transparent); mask-image: linear-gradient(to bottom, #000 calc(100% - 28px), transparent); }
/* the method description is long: two lines, tap for all of it */
#methodDesc { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; cursor: pointer; }
#methodDesc.open { display: block; }
.chip-btn.small { height: 38px; padding: 0 12px; font-size: var(--t-s); }
.chip-btn.small .ic { width: 18px; height: 18px; }
#btnTest.attn { border-color: var(--focus); color: var(--focus); }

/* ---------- light panel (white balance / true colour), over the bottom of the picture ---------- */
.pop { padding: 12px 14px 14px; display: flex; flex-direction: column; gap: 10px; }
#wbPop { max-height: 62vh; overflow-y: auto; touch-action: pan-y; }
.pop-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.pop-head b { font-size: var(--t-l); }
.pop .desc { margin: 0; }
.pop-box { display: flex; flex-direction: column; gap: 10px; }
.pop-label { font-size: var(--t-xs); font-weight: 800; color: var(--muted); letter-spacing: 0.02em; }
.pop .chips { margin: 0; padding: 0; flex-wrap: wrap; }
/* the four ways to measure share one row and its width */
.pop .tc-src > button { flex: 1 1 auto; padding: 0 10px; }
.pop-more { border-top: 1px solid var(--line); padding-top: 4px; }
.pop-more > summary { list-style: none; display: flex; align-items: center; justify-content: space-between; min-height: 44px; font-weight: 700; font-size: var(--t-m); color: var(--muted); cursor: pointer; }
.pop-more > summary::-webkit-details-marker { display: none; }
.pop-more > summary::after { content: ""; width: 9px; height: 9px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg); margin: -4px 6px 0 0; transition: transform 0.2s; }
.pop-more[open] > summary::after { transform: rotate(-135deg); margin-top: 4px; }
.cal-btn { min-height: 48px; font-size: var(--t-b); }
.tc-probe { color: var(--text); text-decoration: underline; text-underline-offset: 3px; align-self: flex-start; padding: 6px 0; }

/* ---------- form controls ---------- */
.seg-wide { display: flex; width: 100%; border-radius: var(--r-ctl); }
.seg-wide > button { flex: 1; min-width: 0; border-radius: 9px; flex-direction: column; gap: 0; padding: 8px 4px; min-height: 46px; font-size: var(--t-m); }
.seg-wide > button small { font-weight: 400; font-size: var(--t-xs); opacity: 0.85; }
.seg-tall > button { padding: 10px 8px; text-align: center; white-space: normal; }
.row-inline { display: grid; grid-template-columns: minmax(96px, auto) 1fr; gap: 10px; align-items: center; }
.label, .row-inline .label { font-size: var(--t-s); color: var(--muted); font-weight: 700; }
.row-inline .label { display: flex; flex-direction: column; line-height: 1.25; }
output { color: var(--text); font-weight: 700; }
.chips { display: flex; flex-wrap: nowrap; gap: 6px; overflow-x: auto; touch-action: pan-x; scrollbar-width: none; margin: 0 -12px; padding: 0 12px; }
.chips::-webkit-scrollbar { display: none; }
.chips > button { flex: none; white-space: nowrap; padding: 0 14px; border-radius: var(--r-pill); border: 1px solid var(--line); background: var(--raise); font-weight: 650; font-size: var(--t-m); min-height: 40px; }
.chips > button.on { background: var(--sel-bg); color: var(--sel-text); border-color: var(--sel-bg); }
.desc { margin: 6px 0 0; font-size: var(--t-s); color: var(--muted); line-height: 1.5; user-select: text; -webkit-user-select: text; }
.toggles { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.tog { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: var(--t-m); min-height: 44px; cursor: pointer; line-height: 1.35; }
.tog input { appearance: none; -webkit-appearance: none; width: 44px; height: 28px; border-radius: var(--r-pill); background: rgba(255, 255, 255, 0.18); position: relative; flex: none; margin: 0; transition: background 0.15s; }
.tog input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: #8a929e; transition: transform 0.15s, background 0.15s; }
.tog input:checked { background: var(--sel-bg); }
.tog input:checked::after { transform: translateX(16px); background: var(--bg); }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 36px; background: transparent; touch-action: pan-x; }
input[type="range"]::-webkit-slider-runnable-track { height: 6px; border-radius: 3px; background: rgba(255, 255, 255, 0.25); }
input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: rgba(255, 255, 255, 0.25); }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 26px; height: 26px; border-radius: 50%; background: #fff; margin-top: -10px; box-shadow: 0 0 0 2px var(--bg), 0 1px 4px rgba(0, 0, 0, 0.6); }
input[type="range"]::-moz-range-thumb { width: 26px; height: 26px; border-radius: 50%; background: #fff; border: 2px solid var(--bg); }
.range-ends { display: flex; align-items: center; gap: 10px; }
.range-ends small { color: var(--muted); font-size: var(--t-xs); white-space: nowrap; }

/* ---------- buttons ---------- */
.primary, .secondary, .link { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; border-radius: 14px; font-weight: 700; font-size: var(--t-l); padding: 0 18px; }
.primary { background: var(--sel-bg); color: var(--sel-text); }
.secondary { background: var(--raise); border: 1px solid var(--line); }
.secondary.small { min-height: 44px; font-size: var(--t-m); flex: 1; border-radius: var(--r-ctl); padding: 0 12px; }
.small-btn { min-height: 44px; font-size: var(--t-b); flex: 1; border-radius: var(--r-ctl); }
.link { color: var(--muted); min-height: 44px; }
.wide-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; min-height: 44px; padding: 8px 12px; border-radius: var(--r-ctl); border: 1px solid var(--line); background: var(--raise); font-weight: 700; font-size: var(--t-m); }
.btn-row { display: flex; gap: 10px; margin-top: 4px; flex-wrap: wrap; }
.btn-row > button { flex: 1 1 auto; white-space: nowrap; }

/* ---------- start screen ---------- */
.sheet-full { position: absolute; inset: 0; z-index: 20; background: radial-gradient(120% 80% at 50% 0%, #1d2533 0%, var(--bg) 60%); display: flex; align-items: center; justify-content: center; padding: calc(var(--safe-t) + 20px) 24px calc(var(--safe-b) + 20px); }
.start-inner { width: 100%; max-width: 420px; text-align: center; display: flex; flex-direction: column; align-items: stretch; gap: 12px; }
.logo { align-self: center; border-radius: 22px; box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5); }
.start-inner h1 { margin: 8px 0 0; font-size: calc(28px * var(--fs)); }
.tagline { margin: 0 0 12px; color: var(--muted); font-size: var(--t-l); }
.note { color: var(--muted); font-size: var(--t-s); margin: 6px 0 0; }
.error { background: var(--raise-2); border: 1px solid rgba(255, 255, 255, 0.35); border-left: 4px solid #fff; padding: 10px 12px; border-radius: var(--r-ctl); text-align: left; font-size: var(--t-m); margin: 0; user-select: text; }

/* ---------- bottom sheets (settings, lens, explanation, validation, tuning) ---------- */
.sheet { position: absolute; inset: 0; z-index: 30; background: rgba(0, 0, 0, 0.55); display: flex; align-items: flex-end; justify-content: center; }
.sheet-inner {
  position: relative; width: 100%; max-width: 560px; max-height: 88vh; overflow-y: auto; touch-action: pan-y;
  background: var(--panel-solid); border: 1px solid var(--line); border-bottom: 0; border-radius: var(--r-sheet) var(--r-sheet) 0 0;
  padding: 12px 18px calc(var(--safe-b) + 20px);
}
.sheet-inner::before { content: ""; position: absolute; left: 50%; top: 7px; width: 38px; height: 4px; margin-left: -19px; border-radius: 2px; background: var(--line-2); }
.sheet-head { position: sticky; top: -12px; background: var(--panel-solid); display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0 10px; z-index: 1; }
.sheet-head h2 { margin: 0; font-size: var(--t-xl); line-height: 1.25; }
.srow { padding: 12px 0; border-bottom: 1px solid var(--line); }
.srow .label { margin-bottom: 8px; display: flex; gap: 6px; align-items: baseline; }
.sgroup { margin: 18px 0 2px; font-size: var(--t-xs); font-weight: 800; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; }
.srow-btn { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.srow-btn .desc { margin-top: 2px; }
.srow-title { font-weight: 650; font-size: var(--t-b); }
.srow-btn .chip-btn { flex: none; padding: 0 16px; font-weight: 700; }
.chip-btn.armed { background: var(--sel-bg); color: var(--sel-text); }
.srow.tog { display: flex; }
.fold summary { font-weight: 650; font-size: var(--t-b); cursor: pointer; list-style-position: inside; min-height: 32px; }
.fold[open] summary { margin-bottom: 4px; }
.version a { color: var(--text); }

/* explanation sheet */
.info-line { margin: 0 0 12px; font-size: var(--t-l); font-weight: 750; line-height: 1.35; }
.info-actions { display: flex; flex-direction: column; gap: 10px; margin-bottom: 6px; }
.info-act { padding: 10px 12px; border-radius: var(--r-ctl); background: var(--raise); border: 1px solid var(--line); }
.info-act-label { font-size: var(--t-s); font-weight: 700; color: var(--muted); margin-bottom: 8px; }
.info-act-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.info-body { font-size: var(--t-b); line-height: 1.55; user-select: text; -webkit-user-select: text; }
.info-body h4 { margin: 18px 0 6px; font-size: var(--t-s); font-weight: 800; color: var(--muted); letter-spacing: 0.02em; }
.info-body p { margin: 0 0 8px; }
.info-body ul { margin: 0 0 8px; padding-left: 20px; }
.info-body li { margin: 3px 0; }

/* camera list */
.cam-list { display: flex; flex-direction: column; gap: 8px; }
.cam-item { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; min-height: 52px; padding: 10px 14px; border-radius: var(--r-ctl); border: 1px solid var(--line); background: var(--raise); text-align: left; }
.cam-item[aria-pressed="true"] { background: var(--sel-bg); color: var(--sel-text); }
.cam-item .cam-name { font-weight: 700; font-size: var(--t-b); }
.cam-item em { font-style: normal; font-size: var(--t-xs); font-weight: 800; padding: 1px 6px; border-radius: 6px; border: 1px solid currentColor; margin-left: 4px; }
.cam-item small { font-size: var(--t-xs); opacity: 0.75; word-break: break-all; }
.cam-item.busy { opacity: 0.85; }
.cam-item.failed { border-style: dashed; }
.cam-item .cam-fail { opacity: 1; color: #ffb74d; font-weight: 700; }
.cam-limits { border-left: 3px solid var(--focus); padding-left: 10px; }

/* reticle picker (settings) */
.ret-pick { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.ret-pick button { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 8px 2px 6px; border-radius: var(--r-ctl); border: 1px solid var(--line); background: #39414d; font-size: var(--t-xs); font-weight: 650; color: var(--text); }
.ret-pick button .ret-svg { width: 34px; height: 34px; }
.ret-pick button[aria-selected="true"] { outline: 2px solid var(--sel-bg); outline-offset: 1px; }
.ret-size { margin-top: 8px; }
.ret-size > button { min-height: 40px; }

/* photo prompt */
#photoAsk .sheet-inner { display: flex; flex-direction: column; gap: 12px; }
#photoAsk h2 { margin: 14px 0 0; font-size: var(--t-xl); }
.ask-btn { display: flex; align-items: center; gap: 14px; text-align: left; min-height: 64px; padding: 12px 16px; border-radius: var(--r-panel); }
.ask-btn .ic { width: 26px; height: 26px; flex: none; }
.ask-btn span { display: flex; flex-direction: column; gap: 2px; font-size: var(--t-b); }
.ask-btn small { font-weight: 500; font-size: var(--t-s); opacity: 0.85; }

/* validation */
.val-table { width: 100%; border-collapse: collapse; font-size: var(--t-m); margin: 8px 0 12px; font-variant-numeric: tabular-nums; }
.val-table th, .val-table td { padding: 8px 6px; border-bottom: 1px solid var(--line); text-align: right; }
.val-table th:first-child, .val-table td:first-child { text-align: left; }
.val-table th { color: var(--muted); font-size: var(--t-xs); font-weight: 800; }
.val-table.small { font-size: var(--t-s); }
#valBody h4 { margin: 14px 0 2px; font-size: var(--t-s); color: var(--muted); }

/* tuning test */
.test-inner { text-align: center; }
.test-inner #btnTestStart { width: 100%; margin-top: 12px; }
.progress { color: var(--muted); font-weight: 700; margin: 4px 0 8px; font-size: var(--t-m); }
#testCanvas { width: min(78vw, 46vh, 360px); height: min(78vw, 46vh, 360px); border-radius: 50%; background: #000; }
.dir-pad { display: grid; grid-template-columns: repeat(3, 1fr); grid-template-areas: ". up ." "left none right" ". down ."; gap: 8px; max-width: 320px; margin: 10px auto 0; }
.dir-pad button { min-height: 52px; border-radius: var(--r-ctl); background: var(--raise); border: 1px solid var(--line); font-weight: 700; font-size: var(--t-l); }
.dir-pad .d-up { grid-area: up; } .dir-pad .d-left { grid-area: left; } .dir-pad .d-right { grid-area: right; } .dir-pad .d-down { grid-area: down; }
.dir-pad .d-none { grid-area: none; font-size: var(--t-s); }
.result-text { font-size: calc(18px * var(--fs)); font-weight: 700; }
.verify-note { white-space: pre-line; text-align: left; background: var(--raise); border: 1px solid var(--line); border-radius: var(--r-ctl); padding: 10px 12px; font-size: var(--t-m); line-height: 1.55; margin: 8px 0; }
.verify-note.bad { border-color: rgba(255, 183, 77, 0.7); }
#testBars { display: flex; flex-direction: column; gap: 8px; text-align: left; margin: 10px 0; }
.bar { display: grid; grid-template-columns: 90px 1fr 44px; align-items: center; gap: 8px; font-size: var(--t-s); font-weight: 600; }
.bar .track { display: block; height: 10px; border-radius: 5px; background: rgba(255, 255, 255, 0.15); overflow: hidden; }
.bar .fill { display: block; height: 100%; background: #fff; }
.bar.best { font-weight: 800; }
.bar.best span:first-child::after { content: " ←"; }

/* toast */
#toast {
  position: absolute; z-index: 40; left: 50%; top: calc(var(--safe-t) + 70px); transform: translate(-50%, -10px);
  background: rgba(10, 12, 16, 0.94); border: 1px solid var(--line); padding: 11px 16px; border-radius: 14px;
  font-weight: 600; font-size: var(--t-m); line-height: 1.4; max-width: calc(100% - 32px); text-align: center;
  opacity: 0; transition: opacity 0.2s, transform 0.2s; pointer-events: none;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- screen sizes ---------- */
@media (min-width: 700px) {
  .bottom { left: 50%; right: auto; width: 560px; transform: translateX(-50%); padding-left: 0; padding-right: 0; background: none; }
}
@media (max-height: 680px) {
  .name { --ns: calc(21px * var(--fs)); }
  #swatch { width: 48px; height: 48px; }
  .toolbar > button { min-height: 50px; padding: 4px; }
  .hint { min-height: 44px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
@media (max-width: 400px) { .name-set-lbl { display: none; } }
@media (max-width: 380px) { #swatch { width: 48px; height: 48px; } .card-main { gap: 10px; } }
@media (max-width: 360px) { .tag-chip > .ic { display: none; } .tag-chip { padding-left: 12px; } }