/* ============================================================
   走馬機概念展示 — 工業藍圖 × 工程儀表板
   配色：深藍底 / 青藍 / 銅橘
   ============================================================ */

:root {
  --bg-0: #081420;
  --bg-1: #0b1c2c;
  --panel: #0e2436;
  --panel-2: #123049;
  --line: #2f5f82;
  --line-soft: #1e405c;
  --cyan: #4cc9e8;
  --cyan-dim: #7fd4ec;
  --copper: #f2a35e;
  --copper-dim: #d98a3d;
  --ink: #dbe9f5;
  --ink-dim: #8fb3cf;
  --ink-faint: #5f83a3;
  --good: #6fd6a3;
  --warn: #f2c14e;
  --danger: #e86a5f;

  --font-display: "Bahnschrift", "DIN Alternate", "Arial Narrow", "Microsoft JhengHei", sans-serif;
  --font-body: "Segoe UI", "Microsoft JhengHei", "PingFang TC", system-ui, sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "SFMono-Regular", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg-0);
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* 藍圖格線 + 暈影（環境背景） */
body::before {
  content: "";
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(76, 201, 232, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76, 201, 232, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(76, 201, 232, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76, 201, 232, 0.028) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(1200px 700px at 78% -8%, rgba(76, 201, 232, 0.10), transparent 60%),
    radial-gradient(900px 600px at -6% 96%, rgba(242, 163, 94, 0.08), transparent 55%);
  pointer-events: none;
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 22px; }

/* ---------- 通用 ---------- */
h1, h2, h3 { font-family: var(--font-display); letter-spacing: 0.02em; line-height: 1.2; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); color: var(--cyan); }
h3 { font-size: 1.15rem; color: var(--ink); }

.section { padding: 56px 0 20px; }
.section-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 8px; flex-wrap: wrap; }
.section-head .kicker {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.18em;
  color: var(--copper); text-transform: uppercase;
}
.section-sub { color: var(--ink-dim); max-width: 68ch; margin-bottom: 26px; }

.panel {
  background: linear-gradient(160deg, var(--panel) 0%, var(--bg-1) 100%);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 20px;
  position: relative;
}
.panel::before {
  content: ""; position: absolute; inset: 0;
  border-radius: 10px; pointer-events: none;
  box-shadow: inset 0 1px 0 rgba(127, 212, 236, 0.08);
}

.mono { font-family: var(--font-mono); }

/* 捲動浮現 */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* 焦點可見（無障礙） */
:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================
   標頭：工程圖標題欄（非置中 hero）
   ============================================================ */
header.site {
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(14, 36, 54, 0.85), rgba(8, 20, 32, 0.4));
  backdrop-filter: blur(4px);
}
.titleblock {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 26px;
  align-items: stretch;
  padding: 34px 0 26px;
}
.tb-id {
  font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.22em;
  color: var(--copper); text-transform: uppercase;
  display: flex; align-items: center; gap: 10px; margin-bottom: 10px;
}
.tb-id::before { content: ""; width: 34px; height: 1px; background: var(--copper-dim); }
h1.machine {
  font-size: clamp(2.3rem, 5.4vw, 3.7rem);
  color: var(--ink);
  text-shadow: 0 0 26px rgba(76, 201, 232, 0.25);
}
h1.machine .accent { color: var(--copper); }
.tb-sub { color: var(--ink-dim); margin-top: 8px; max-width: 56ch; }
.tb-sub b { color: var(--cyan-dim); font-weight: 600; }

/* 規格側欄（像圖框右上角的標題格） */
.spec-strip {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-width: 250px;
  display: flex; flex-direction: column;
  overflow: hidden;
  background: rgba(10, 26, 40, 0.7);
}
.spec-strip .spec {
  padding: 9px 16px;
  border-bottom: 1px dashed var(--line-soft);
  display: flex; justify-content: space-between; gap: 18px; align-items: baseline;
}
.spec-strip .spec:last-child { border-bottom: none; }
.spec .k { font-size: 0.72rem; letter-spacing: 0.14em; color: var(--ink-faint); text-transform: uppercase; font-family: var(--font-mono); }
.spec .v { font-family: var(--font-mono); color: var(--cyan-dim); font-size: 0.92rem; }
.spec .v.copper { color: var(--copper); }

/* ============================================================
   控制列（sticky）
   ============================================================ */
.controls {
  position: sticky; top: 0; z-index: 40;
  background: rgba(8, 20, 32, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
  padding: 12px 0;
}
.controls .wrap { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.ctl-group { display: flex; align-items: center; gap: 8px; }
.ctl-label { font-size: 0.72rem; letter-spacing: 0.12em; color: var(--ink-faint); text-transform: uppercase; font-family: var(--font-mono); }

button {
  font-family: var(--font-body);
  cursor: pointer;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--panel-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 8px 14px;
  font-size: 0.9rem;
  transition: border-color .2s, transform .15s, box-shadow .2s, background .2s;
}
.btn:hover { border-color: var(--cyan); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(76, 201, 232, 0.18); }
.btn:active { transform: translateY(0); }
.btn.primary { background: linear-gradient(160deg, var(--copper), var(--copper-dim)); color: #14212e; border-color: var(--copper); font-weight: 700; }
.btn.primary:hover { box-shadow: 0 4px 16px rgba(242, 163, 94, 0.35); }
.btn .play-icon { font-size: 0.8rem; }

/* 速度滑桿 */
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 130px; height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--copper));
  outline-offset: 4px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--ink); border: 2px solid var(--copper);
  cursor: pointer; transition: transform .15s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--ink); border: 2px solid var(--copper); cursor: pointer;
}
.speed-val { font-family: var(--font-mono); color: var(--cyan-dim); min-width: 3.2em; }

/* 軌跡開關 */
.switch { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch .track {
  width: 38px; height: 20px; border-radius: 10px;
  background: var(--panel-2); border: 1px solid var(--line);
  position: relative; transition: background .2s, border-color .2s;
}
.switch .track::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--ink-dim); transition: transform .2s, background .2s;
}
.switch input:checked + .track { background: rgba(76, 201, 232, 0.25); border-color: var(--cyan); }
.switch input:checked + .track::after { transform: translateX(18px); background: var(--cyan); }
.switch input:focus-visible + .track { outline: 2px solid var(--copper); outline-offset: 3px; }
.switch .sw-label { font-size: 0.86rem; color: var(--ink-dim); }

/* 配色按鈕 */
#paletteBtn .swatch { width: 12px; height: 12px; border-radius: 3px; border: 1px solid rgba(255,255,255,0.35); display: inline-block; }
#paletteBtn .pal-name { font-size: 0.86rem; }

/* ============================================================
   方案分頁
   ============================================================ */
.scheme-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 26px 0 20px; }
.scheme-tab {
  text-align: left;
  background: linear-gradient(160deg, var(--panel) 0%, var(--bg-1) 100%);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--ink);
  display: flex; flex-direction: column; gap: 3px;
  transition: border-color .2s, transform .18s, box-shadow .2s, background .2s;
}
.scheme-tab:hover { transform: translateY(-2px); border-color: var(--cyan); box-shadow: 0 6px 18px rgba(0,0,0,0.35); }
.scheme-tab .tab-index { font-family: var(--font-mono); font-size: 0.72rem; color: var(--copper); letter-spacing: 0.15em; }
.scheme-tab .tab-name { font-weight: 700; font-size: 1rem; }
.scheme-tab .tab-tag { font-family: var(--font-mono); font-size: 0.68rem; color: var(--ink-faint); letter-spacing: 0.12em; }
.scheme-tab.active {
  border-left-color: var(--copper);
  border-color: var(--copper);
  background: linear-gradient(160deg, rgba(242, 163, 94, 0.12), var(--panel) 60%);
  box-shadow: 0 0 0 1px rgba(242, 163, 94, 0.25), 0 8px 22px rgba(0,0,0,0.4);
}
.scheme-tab.active .tab-name { color: var(--copper); }

/* ============================================================
   走錠設定器（偶數走／單數走）
   ============================================================ */
.carrier-config { margin: 0 0 24px; border-left: 3px solid var(--copper); }
.cc-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.cc-kicker {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.18em;
  color: var(--copper); text-transform: uppercase;
}
.cc-head h3 { font-size: 1.15rem; color: var(--ink); }
.cc-note { font-size: 0.76rem; color: var(--ink-faint); font-family: var(--font-mono); }

.cc-row { display: flex; flex-wrap: wrap; gap: 16px; align-items: stretch; }

/* 奇偶模式（原生 radio，保留鍵盤與 ARIA 語意） */
.cc-parity {
  border: 1px solid var(--line-soft); border-radius: 8px;
  padding: 8px 12px 10px; display: flex; gap: 10px; align-items: center;
  min-inline-size: 0;
}
.cc-parity legend {
  font-size: 0.68rem; color: var(--ink-faint); font-family: var(--font-mono);
  letter-spacing: 0.12em; padding: 0 4px;
}
.cc-opt { position: relative; display: inline-flex; cursor: pointer; }
.cc-opt input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.cc-pill {
  display: flex; flex-direction: column; align-items: center; gap: 1px;
  border: 1px solid var(--line-soft); border-radius: 7px;
  padding: 7px 16px; background: var(--panel-2);
  transition: border-color .2s, background .2s, transform .15s, box-shadow .2s;
}
.cc-pill .cc-name { font-weight: 700; font-size: 0.94rem; color: var(--ink-dim); transition: color .2s; }
.cc-pill small { font-family: var(--font-mono); font-size: 0.64rem; color: var(--ink-faint); letter-spacing: 0.06em; }
.cc-opt:hover .cc-pill { border-color: var(--cyan); transform: translateY(-1px); }
.cc-opt input:checked + .cc-pill {
  border-color: var(--copper);
  background: linear-gradient(160deg, rgba(242, 163, 94, 0.16), var(--panel-2) 70%);
  box-shadow: 0 0 0 1px rgba(242, 163, 94, 0.25);
}
.cc-opt input:checked + .cc-pill .cc-name { color: var(--copper); }
.cc-opt input:focus-visible + .cc-pill { outline: 2px solid var(--copper); outline-offset: 3px; }

/* 錠數步進器 */
.cc-stepper {
  display: flex; align-items: center; gap: 12px;
  border: 1px solid var(--line-soft); border-radius: 8px; padding: 8px 14px;
}
.cc-btn { min-width: 46px; justify-content: center; font-family: var(--font-mono); font-weight: 700; }
.cc-btn:disabled {
  opacity: 0.32; cursor: not-allowed; transform: none;
  box-shadow: none; border-color: var(--line-soft);
}
.cc-count { display: flex; align-items: baseline; gap: 6px; min-width: 66px; justify-content: center; }
.cc-num {
  font-family: var(--font-display); font-size: 2rem; font-weight: 700;
  color: var(--cyan); line-height: 1; text-shadow: 0 0 16px rgba(76, 201, 232, 0.35);
}
.cc-unit { font-size: 0.82rem; color: var(--ink-dim); }

/* 直接選擇 */
.cc-select { display: flex; flex-direction: column; gap: 5px; justify-content: center; }
.cc-select label {
  font-size: 0.68rem; color: var(--ink-faint); font-family: var(--font-mono); letter-spacing: 0.12em;
}
.cc-select select {
  background: var(--panel-2); color: var(--cyan-dim);
  border: 1px solid var(--line); border-radius: 7px;
  padding: 8px 12px; font-size: 0.9rem; font-family: var(--font-mono);
  cursor: pointer; transition: border-color .2s;
}
.cc-select select:hover { border-color: var(--cyan); }

.cc-groups { margin-top: 14px; font-family: var(--font-mono); font-size: 0.9rem; color: var(--cyan-dim); }
.cc-hint { margin-top: 4px; font-size: 0.8rem; color: var(--ink-dim); max-width: 72ch; }

/* ============================================================
   主舞台：軌道動畫 + 織帶/資訊
   ============================================================ */
.stage { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 22px; align-items: start; }
.stage .panel { overflow: hidden; }

.stage-svg-wrap { position: relative; }
#trackSvg { width: 100%; height: auto; display: block; }
.svg-label { fill: var(--cyan-dim); font-size: 15px; font-family: var(--font-body); }
.svg-callout { fill: var(--cyan-dim); font-size: 14px; font-family: var(--font-body); }

.readout {
  margin-top: 12px;
  font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--cyan-dim);
  display: flex; align-items: center; gap: 10px;
}
.readout::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--good); box-shadow: 0 0 8px var(--good); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.legend { display: flex; gap: 18px; margin-top: 10px; font-size: 0.8rem; color: var(--ink-dim); flex-wrap: wrap; }
.legend .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 6px; vertical-align: -1px; }

/* 右欄 */
.right-col { display: flex; flex-direction: column; gap: 18px; }

.pattern-panel h3, .info-panel h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.8rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-faint); font-family: var(--font-mono); font-weight: 600; margin-bottom: 12px;
}
.pattern-panel h3::after, .info-panel h3::after { content: ""; flex: 1; height: 1px; background: var(--line-soft); }

.pattern-frame {
  border: 1px solid var(--line-soft); border-radius: 8px;
  background: #0a1a28; padding: 10px;
  display: flex; justify-content: center;
}
#patternSvg { width: auto; height: 340px; max-width: 100%; display: block; }
.pattern-note { font-size: 0.78rem; color: var(--ink-faint); margin-top: 8px; font-family: var(--font-mono); }
.pattern-disclaimer {
  font-size: 0.74rem; color: var(--ink-faint); margin-top: 8px;
  border-left: 2px solid var(--line-soft); padding-left: 9px; line-height: 1.5;
}
.pattern-disclaimer b { color: var(--copper-dim); font-weight: 600; }

.info-panel .info-title { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 4px; }
.info-panel .info-title .idx { font-family: var(--font-mono); color: var(--copper); font-size: 1.4rem; font-weight: 700; }
.info-panel .info-title h3 { font-family: var(--font-display); font-size: 1.45rem; letter-spacing: 0.02em; text-transform: none; color: var(--ink); }
.info-panel .info-title .tag { font-family: var(--font-mono); font-size: 0.72rem; color: var(--cyan); border: 1px solid var(--line); padding: 2px 8px; border-radius: 4px; letter-spacing: 0.12em; }
.info-panel .subtitle { color: var(--copper-dim); font-size: 0.9rem; margin-bottom: 12px; }
.info-panel p { font-size: 0.92rem; color: var(--ink-dim); margin-bottom: 10px; }
.info-panel p b { color: var(--ink); }
.info-panel .how { border-left: 3px solid var(--cyan); padding-left: 12px; }

dl.params { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; margin-top: 14px; }
dl.params dt { font-size: 0.78rem; color: var(--ink-faint); font-family: var(--font-mono); letter-spacing: 0.08em; padding-top: 2px; }
dl.params dd { font-size: 0.88rem; color: var(--cyan-dim); font-family: var(--font-mono); border-bottom: 1px dashed var(--line-soft); padding-bottom: 5px; }
.repeat-line { margin-top: 12px; font-size: 0.82rem; color: var(--copper-dim); font-family: var(--font-mono); }
.repeat-line b { color: var(--copper); }

/* ============================================================
   機械圖區
   ============================================================ */
.diagram-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.diagram-card { padding: 18px; }
.diagram-card .d-title {
  font-family: var(--font-display); font-size: 1.05rem; color: var(--cyan);
  display: flex; align-items: center; gap: 10px; margin-bottom: 4px;
}
.diagram-card .d-title .no { font-family: var(--font-mono); font-size: 0.72rem; color: var(--copper); border: 1px solid var(--copper-dim); border-radius: 4px; padding: 1px 7px; }
.diagram-card .d-desc { font-size: 0.82rem; color: var(--ink-faint); margin-bottom: 12px; }
.diagram-card svg { width: 100%; height: auto; display: block; }
.diagram-card.wide { grid-column: 1 / -1; }

/* 動力流程 */
.flow { display: flex; flex-wrap: wrap; gap: 0; align-items: stretch; margin-top: 6px; }
.flow-node {
  flex: 1 1 120px; min-width: 120px;
  background: linear-gradient(160deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 12px;
  position: relative;
  transition: transform .18s, border-color .2s, box-shadow .2s;
}
.flow-node:hover { transform: translateY(-3px); border-color: var(--copper); box-shadow: 0 6px 16px rgba(242,163,94,0.15); }
.flow-node .fn-step { font-family: var(--font-mono); font-size: 0.68rem; color: var(--copper); letter-spacing: 0.15em; }
.flow-node .fn-name { font-weight: 700; font-size: 0.95rem; margin: 2px 0; }
.flow-node .fn-note { font-size: 0.74rem; color: var(--ink-faint); }
.flow-arrow { display: flex; align-items: center; color: var(--cyan); font-size: 1.3rem; padding: 0 6px; }

/* ============================================================
   參考照片
   ============================================================ */
.ref-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 22px; align-items: start; }
.ref-photo { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #0a1a28; }
.ref-photo img { width: 100%; height: auto; display: block; }
.ref-photo figcaption {
  padding: 10px 14px; font-size: 0.8rem; color: var(--copper-dim);
  border-top: 1px solid var(--line-soft); font-family: var(--font-mono);
}
.disclaimer {
  border: 1px solid var(--copper-dim);
  border-left: 4px solid var(--copper);
  background: rgba(242, 163, 94, 0.07);
  border-radius: 8px;
  padding: 16px 18px;
}
.disclaimer h3 { color: var(--copper); font-size: 1rem; margin-bottom: 8px; }
.disclaimer p { font-size: 0.9rem; color: var(--ink-dim); }
.disclaimer p + p { margin-top: 8px; }

/* ============================================================
   安全
   ============================================================ */
.safety-list { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.safety-item {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--danger);
  border-radius: 8px;
  padding: 14px 16px;
  background: linear-gradient(160deg, rgba(232, 106, 95, 0.06), var(--panel) 55%);
  transition: transform .18s, border-color .2s;
}
.safety-item:hover { transform: translateY(-2px); border-left-color: var(--warn); }
.safety-item strong { display: block; color: var(--warn); font-size: 0.95rem; margin-bottom: 4px; }
.safety-item span { font-size: 0.84rem; color: var(--ink-dim); }

/* ============================================================
   文件連結
   ============================================================ */
.doc-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.doc-link {
  display: block; text-decoration: none;
  border: 1px solid var(--line-soft); border-radius: 8px;
  padding: 16px;
  background: linear-gradient(160deg, var(--panel), var(--bg-1));
  transition: border-color .2s, transform .18s, box-shadow .2s;
}
.doc-link:hover { border-color: var(--cyan); transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.4); }
.doc-link .dl-ext { font-family: var(--font-mono); font-size: 0.68rem; color: var(--copper); letter-spacing: 0.15em; }
.doc-link .dl-name { font-weight: 700; color: var(--ink); margin: 4px 0 2px; }
.doc-link .dl-desc { font-size: 0.78rem; color: var(--ink-faint); }

/* ============================================================
   頁尾
   ============================================================ */
footer.site { border-top: 1px solid var(--line-soft); margin-top: 60px; padding: 26px 0 40px; }
footer.site .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.site p { font-size: 0.8rem; color: var(--ink-faint); }
footer.site .mono { color: var(--cyan-dim); }

.motion-note {
  background: rgba(76, 201, 232, 0.08);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.84rem;
  color: var(--cyan-dim);
  margin-top: 14px;
}

/* ============================================================
   響應式
   ============================================================ */
@media (max-width: 980px) {
  .stage { grid-template-columns: 1fr; }
  .diagram-grid { grid-template-columns: 1fr; }
  .ref-grid { grid-template-columns: 1fr; }
  .safety-list { grid-template-columns: repeat(2, 1fr); }
  .doc-links { grid-template-columns: repeat(2, 1fr); }
  .scheme-tabs { grid-template-columns: repeat(2, 1fr); }
  .titleblock { grid-template-columns: 1fr; }
  .spec-strip { flex-direction: row; flex-wrap: wrap; min-width: 0; }
  .spec-strip .spec { flex: 1 1 45%; border-bottom: none; border-right: 1px dashed var(--line-soft); }
}
@media (max-width: 620px) {
  .safety-list { grid-template-columns: 1fr; }
  .doc-links { grid-template-columns: 1fr; }
  .scheme-tabs { grid-template-columns: 1fr; }
  .controls .wrap { gap: 10px; }
  input[type="range"] { width: 100px; }
  #patternSvg { height: 280px; }
  /* 走錠設定器：窄版面（含 390px 手機）改縱向堆疊，避免溢出 */
  .cc-row { flex-direction: column; align-items: stretch; gap: 12px; }
  .cc-parity { width: 100%; }
  .cc-parity .cc-opt { flex: 1; }
  .cc-pill { width: 100%; }
  .cc-stepper { width: 100%; justify-content: space-between; }
  .cc-select { width: 100%; }
  .cc-select select { width: 100%; }
}

/* 降低動態（無障礙） */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .readout::before { animation: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}