/* ============================================================
   BikeFit v2 · main.css
   设计令牌 + 四屏组件样式（借鉴旧版 Apple Health 风，重排信息层级）
   ============================================================ */
:root {
  --bg: #f5f5f7; --card: #ffffff;
  --ink: #1c1c1e; --sub: #6e6e73; --faint: #8e8e93; --line: #e5e5ea;
  --pink: #FF2D55; --green: #34C759; --orange: #FF9500; --purple: #BF5AF2;
  --indigo: #5E5CE6; --blue: #0A84FF; --red: #FF453A; --teal: #30B0C7;
  --radius: 18px;
  --shadow: 0 4px 18px rgba(0,0,0,0.05);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.55;
  min-height: 100vh;
}
.hidden { display: none !important; }
button { font-family: inherit; cursor: pointer; }
h3 { font-size: 16px; font-weight: 800; }
.card-sub { font-size: 12.5px; color: var(--sub); margin-top: 4px; }
.card-sub b { color: var(--ink); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--line); box-shadow: var(--shadow); padding: 20px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 14px; font-weight: 700; border-radius: 12px; padding: 10px 18px;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--pink); border-color: var(--pink); color: #fff;
  box-shadow: 0 6px 16px rgba(255,45,85,0.28); }
.btn-primary:hover { background: #ff3d63; }
.btn-ghost { background: #fff; color: var(--sub); }
.btn-ghost:hover { color: var(--ink); background: #f7f7fa; }
.btn-xl { font-size: 16.5px; padding: 15px 34px; border-radius: 16px; }
.btn.blocked { opacity: 0.45; pointer-events: auto; }

/* ---------- 顶栏 ---------- */
#app-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 12px 22px; background: rgba(255,255,255,0.86); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: transform 0.25s ease;
}
/* 报告页下滑自动隐藏（JS 加类，仅报告页启用） */
#app-header.header-hidden { transform: translateY(-100%); pointer-events: none; }
.logo { display: flex; align-items: center; gap: 9px; cursor: pointer; }
.logo-mark { width: 30px; height: 30px; border-radius: 9px; background: var(--pink);
  display: flex; align-items: center; justify-content: center; }
.logo-mark svg { width: 19px; height: 19px; }
.logo-name { font-size: 17px; font-weight: 800; letter-spacing: 0.3px; }
.logo-name em { font-style: normal; color: var(--pink); }
.steps { display: flex; gap: 6px; }
.step { display: flex; align-items: center; gap: 7px; font-size: 12.5px; font-weight: 700;
  color: var(--faint); padding: 6px 12px; border-radius: 999px; }
.step .num { width: 20px; height: 20px; border-radius: 50%; background: #e9e9ee;
  color: var(--faint); font-size: 11px; font-weight: 800;
  display: flex; align-items: center; justify-content: center; }
.step.active { color: var(--ink); background: #f2f2f7; }
.step.active .num { background: var(--pink); color: #fff; }
.step.done { color: var(--sub); }
.step.done .num { background: var(--green); color: #fff; }
.header-nav { display: flex; gap: 8px; }

/* ---------- 屏切换 ---------- */
.screen { display: none; max-width: 1180px; margin: 0 auto; padding: 22px 22px 60px; }
.screen.active { display: block; animation: fadeUp 0.28s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
#screen-welcome.active { display: flex; }

/* ---------- 欢迎屏 ---------- */
#screen-welcome { min-height: 100vh; align-items: center; justify-content: center; padding: 30px 22px; }
.welcome-hero { max-width: 620px; text-align: center; }
.welcome-badge { display: inline-block; font-size: 11.5px; font-weight: 700; letter-spacing: 1px;
  color: var(--pink); background: #fff0f3; border: 1px solid #ffd6e0;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px; }
.welcome-hero h1 { font-size: 44px; font-weight: 800; line-height: 1.18; letter-spacing: 0.5px; }
.welcome-sub { font-size: 14.5px; color: var(--sub); margin: 18px 0 26px; }
.welcome-sub b { color: var(--pink); }
.welcome-feats { display: flex; justify-content: center; gap: 14px; margin-bottom: 30px; }
.wfeat { background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 12px 22px; font-size: 12px; color: var(--sub); font-weight: 600;
  display: flex; flex-direction: column; gap: 2px; box-shadow: var(--shadow); }
.wfeat-num { font-size: 24px; font-weight: 800; color: var(--ink); font-family: var(--mono); }
.welcome-note { margin-top: 16px; font-size: 12px; color: var(--faint); }
.fit-disclaimer { max-width: 540px; margin: 18px auto 4px; font-size: 12px; color: var(--faint);
  text-align: center; line-height: 1.7; }

/* ---------- 测量屏 ---------- */
.measure-layout { display: grid; grid-template-columns: 440px minmax(0,1fr); gap: 18px; align-items: start; }
.figure-card { position: sticky; top: 0; z-index: 30; padding: 14px; }
.figure-caption { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--faint); font-weight: 600; }
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--pink); animation: pulse 1.8s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }
.figure-tabs { position: absolute; top: 14px; right: 14px; display: flex; background: #f2f2f7; border-radius: 9px; padding: 3px; z-index: 2; }
.fig-tab { border: none; background: transparent; font-size: 12px; font-weight: 700; color: var(--sub);
  padding: 5px 13px; border-radius: 7px; }
.fig-tab.active { background: #fff; color: var(--pink); box-shadow: 0 2px 6px rgba(0,0,0,0.1); }
#figure-wrap svg { width: 100%; height: auto; display: block; }

/* 人体图标注 */
.dim-focus { transition: opacity 0.25s ease; }
.dim-focus.dimmed { opacity: 0.15; }
.dim-focus.highlighted { opacity: 1; filter: drop-shadow(0 0 8px rgba(0,0,0,0.22)); }
.hotspot { cursor: pointer; }
.hotspot .hit { fill: transparent; }
.hotspot .ring { fill: #fff; stroke-width: 5; opacity: 0.92; }
.hotspot .core { stroke: #fff; stroke-width: 5; }
.hotspot:hover .ring { opacity: 1; stroke-width: 7; }

/* 测量字段卡 */
.fields-col { display: flex; flex-direction: column; gap: 14px; }
/* 卡片级 grid-areas：桌面 标题行 / stepper左+滑杆右 / 说明行；移动端可重排不依赖 DOM 顺序 */
.field-card { padding: 16px 20px; border: 1.5px solid var(--line); transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  display: grid; grid-template-columns: auto minmax(0,1fr); gap: 10px 14px; align-items: center;
  grid-template-areas: "head head" "num range" "tip tip"; }
/* 选中卡用自身主题色（--acc）淡填充 + 同色描边，与色块/滑杆/人体图高亮同一色彩语言 */
.field-card.active { border-color: var(--acc); background: color-mix(in srgb, var(--acc) 32%, transparent); }
.field-card.invalid { border-color: var(--red); }
.field-head { grid-area: head; display: flex; align-items: center; gap: 9px; }
.field-head .swatch { width: 24px; height: 24px; border-radius: 8px; background: var(--acc); color: #fff;
  font-size: 12px; font-weight: 800; display: flex; align-items: center; justify-content: center; }
.field-head label { font-size: 15px; font-weight: 800; }
.field-head .en { font-size: 11px; color: var(--faint); font-weight: 700; letter-spacing: 1px; margin-left: 6px; }
.field-err { margin-left: auto; font-size: 11px; font-weight: 700; color: var(--red);
  background: #fff0ef; padding: 3px 9px; border-radius: 999px; display: none; }
.field-err.show { display: inline-block; }
.num-wrap { grid-area: num; display: flex; align-items: center; gap: 6px; }
.num-ctrl { display: flex; align-items: center; border: 1.5px solid var(--line); border-radius: 12px; overflow: hidden; }
.num-ctrl button { width: 34px; height: 40px; border: none; background: #f7f7fa; font-size: 17px; font-weight: 700; color: var(--acc); }
.num-ctrl button:hover { background: #efeff4; }
.num-ctrl input { width: 68px; border: none; text-align: center; font-family: var(--mono);
  font-size: 17px; font-weight: 800; color: var(--ink); outline: none; }
.num-ctrl input::-webkit-outer-spin-button, .num-ctrl input::-webkit-inner-spin-button { -webkit-appearance: none; }
.num-unit { font-size: 12px; color: var(--faint); font-weight: 700; margin-left: -8px; }
.range-wrap { grid-area: range; display: flex; flex-direction: column; gap: 3px; }
.range-marks { display: flex; justify-content: space-between; font-size: 10.5px; color: var(--faint); font-weight: 600; }
.range-marks .ref { letter-spacing: 0; }
.field-tip { grid-area: tip; display: flex; gap: 7px; padding: 8px 12px; background: #f7f7fa;
  border-radius: 10px; font-size: 12px; color: var(--sub); }
.field-tip svg { flex-shrink: 0; margin-top: 2px; opacity: 0.55; }

/* 滑杆 */
/* touch-action: pan-y —— 触屏上垂直滑动交还页面滚动，只有水平拖动才改值，防误触跳值 */
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 26px; background: transparent;
  touch-action: pan-y; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { height: 6px; border-radius: 3px;
  background: linear-gradient(to right, var(--acc, var(--pink)) 0%, var(--acc, var(--pink)) var(--pct, 50%), #e9e9ee var(--pct, 50%), #e9e9ee 100%); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: #fff; border: 2.5px solid var(--acc, var(--pink)); margin-top: -8px;
  box-shadow: 0 2px 7px rgba(0,0,0,0.16); }
input[type=range]::-moz-range-track { height: 6px; border-radius: 3px; background: #e9e9ee; }
input[type=range]::-moz-range-progress { height: 6px; border-radius: 3px; background: var(--acc, var(--pink)); }
input[type=range]::-moz-range-thumb { width: 17px; height: 17px; border-radius: 50%;
  background: #fff; border: 2.5px solid var(--acc, var(--pink)); box-shadow: 0 2px 7px rgba(0,0,0,0.16); }

.measure-footer { margin-top: 16px; display: flex; align-items: center; gap: 34px; flex-wrap: wrap; }
.mstat-label { display: block; font-size: 11px; color: var(--faint); font-weight: 700; letter-spacing: 1px; }
.mstat-val { font-family: var(--mono); font-size: 22px; font-weight: 800; }
.mstat-val small { font-size: 12px; color: var(--faint); margin-left: 2px; }
.mstat-tip { font-size: 12px; color: var(--sub); flex: 1; min-width: 220px; }

/* ---------- 骑姿屏 ---------- */
.pos-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 16px; }
.pos-card { padding: 0; overflow: hidden; cursor: pointer; border: 2px solid var(--line);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s; }
.pos-card:hover { transform: translateY(-3px); }
.pos-card.active { border-color: var(--pink); box-shadow: 0 10px 26px rgba(255,45,85,0.18); }
.pos-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; background: #f2f2f7; }
.pos-body { padding: 13px 16px 15px; }
.pos-body h4 { font-size: 15.5px; font-weight: 800; display: flex; align-items: center; gap: 8px; }
.pos-body h4 .coef { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--faint); }
.pos-body p { font-size: 12px; color: var(--sub); margin-top: 5px; }
.pos-badge { font-size: 10px; font-weight: 800; color: var(--pink); background: #fff0f3;
  padding: 2px 8px; border-radius: 999px; }

.test-card { margin-bottom: 16px; }
.test-rows { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; }
.test-row { display: grid; grid-template-columns: 190px 1fr; gap: 12px; align-items: center; }
.test-q { font-size: 13px; font-weight: 700; color: var(--sub); }
.test-options { display: flex; gap: 7px; }
.test-options button { flex: 1; border: 1.5px solid var(--line); background: #f9f9fb; border-radius: 10px;
  padding: 9px 6px; font-size: 12.5px; font-weight: 700; color: var(--sub); transition: all 0.15s; }
.test-options button:hover { border-color: var(--pink); color: var(--pink); }
.test-options button.active { background: var(--pink); color: #fff; border-color: var(--pink);
  box-shadow: 0 3px 10px rgba(255,45,85,0.3); }
.test-rec { margin-top: 14px; padding: 12px 16px; border-radius: 12px; background: #f0f7ff;
  border: 1px solid #cfe4ff; font-size: 13px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.test-rec b { color: var(--blue); }
.test-rec button { border: none; background: var(--blue); color: #fff; font-size: 12.5px; font-weight: 700;
  padding: 7px 14px; border-radius: 9px; }

/* 落差策略 */
.seg4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-top: 12px; }
.seg4 button { border: 1.5px solid var(--line); background: #f9f9fb; border-radius: 12px;
  padding: 10px 6px; font-size: 13.5px; font-weight: 800; color: var(--sub);
  display: flex; flex-direction: column; gap: 2px; align-items: center; transition: all 0.15s; }
.seg4 button small { font-size: 10.5px; font-weight: 600; color: var(--faint); }
.seg4 button:hover { border-color: var(--red); color: var(--red); }
.seg4 button.active { background: var(--red); border-color: var(--red); color: #fff; }
.seg4 button.active small { color: rgba(255,255,255,0.8); }
.drop-hint { margin-top: 12px; font-size: 12.5px; color: var(--sub); font-family: var(--mono);
  background: #fbfbfd; border: 1px dashed var(--line); border-radius: 10px; padding: 9px 13px; }
.drop-hint b { color: var(--red); }
.drop-manual { margin-top: 10px; display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--sub); }
.drop-manual input { width: 84px; font-family: var(--mono); font-size: 14px; font-weight: 700;
  border: 1.5px solid var(--line); border-radius: 10px; padding: 8px 10px; text-align: center; outline: none; }
.drop-manual input:focus { border-color: var(--red); }

/* ---------- 结果屏 ---------- */
#result-warn { display: flex; gap: 10px; background: #fff8e6; border: 1px solid #ffe9a8;
  border-radius: 14px; padding: 13px 16px; font-size: 12.5px; color: #8a6d00; margin-bottom: 16px; }
.result-main { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
.big-card { position: relative; padding: 20px 24px; border-top: 4px solid var(--indigo); cursor: default; }
.big-card[data-group=framereach] { border-top-color: var(--purple); }
.big-card label { font-size: 12px; font-weight: 800; letter-spacing: 1.5px; color: var(--faint); display: block; }
.big-card label small { display: block; letter-spacing: 0; font-weight: 600; color: var(--faint); margin-top: 3px; text-transform: none; }
.big-val b { font-family: var(--mono); font-size: 46px; font-weight: 800; }
.big-card[data-group=framestack] .big-val b { color: var(--indigo); }
.big-card[data-group=framereach] .big-val b { color: var(--purple); }
.big-val small { font-family: var(--mono); font-size: 15px; color: var(--faint); margin-left: 5px; }
.range-pill { position: absolute; top: 20px; right: 22px; font-size: 11px; font-weight: 800;
  padding: 4px 11px; border-radius: 999px; }
.range-pill.ok { background: #e6f9ec; color: #1d8a3e; }
.range-pill.warn { background: #fff0ef; color: #c0392b; }

.result-sub { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
.mini-card { padding: 13px 16px; border-left: 3.5px solid var(--line); }
.mini-card[data-group=saddle] { border-left-color: var(--green); }
.mini-card[data-group=drop] { border-left-color: var(--red); }
.mini-card[data-group=stackplus] { border-left-color: var(--indigo); opacity: 0.92; }
.mini-card[data-group=reachplus] { border-left-color: var(--purple); opacity: 0.92; }
.mini-card label { font-size: 11px; font-weight: 800; letter-spacing: 1px; color: var(--faint); display: block; }
.mini-card label small { display: block; letter-spacing: 0; font-weight: 600; margin-top: 2px; }
.mini-card b { font-family: var(--mono); font-size: 23px; font-weight: 800; }
.mini-card small { font-family: var(--mono); font-size: 11.5px; color: var(--faint); margin-left: 3px; }

/* 报告页：桌面左右分栏（图示左栏吸顶随行，内容右栏，互不遮挡）；移动端单栏吸顶见响应式 */
#screen-result { max-width: 1120px; }
.result-layout { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(0,1fr); gap: 18px; align-items: start; }
.result-body { min-width: 0; }
.bike-card { position: sticky; top: 0; z-index: 30; padding: 14px; }
#bike-wrap svg { width: 100%; height: auto; display: block; }
/* 右栏宽度有限，4 张小卡改 2×2，避免标签挤压换行 */
.result-body .result-sub { grid-template-columns: 1fr 1fr; }

.cockpit-card h3 { margin-bottom: 2px; }
.cock-row { display: grid; grid-template-columns: 84px 1fr 74px; gap: 10px; align-items: center; padding: 7px 0;
  border-bottom: 1px dashed #f0f0f4; }
.cock-row:last-child { border-bottom: none; }
.cock-row label { font-size: 12.5px; font-weight: 700; color: var(--sub); }
.cock-row output { font-family: var(--mono); font-size: 12.5px; font-weight: 800; text-align: right; }

.adv-toggle { margin-top: 14px; display: flex; align-items: center; gap: 9px; padding: 11px 14px;
  background: #f7f7fa; border-radius: 12px; cursor: pointer; user-select: none; }
.adv-toggle span { font-size: 13px; font-weight: 800; }
.adv-toggle small { font-size: 11px; color: var(--faint); flex: 1; }
.adv-toggle .chev { transition: transform 0.2s; color: var(--faint); }
.adv-toggle.open .chev { transform: rotate(180deg); }
#adv-body { margin-top: 10px; padding-top: 6px; border-top: 1px dashed var(--line); }
.adv-note { font-size: 11.5px; color: var(--faint); margin-top: 8px; }
.adv-enable { display: flex; align-items: center; gap: 7px; font-size: 12.5px; font-weight: 700;
  color: var(--sub); padding: 6px 0; }

.result-actions { margin-top: 18px; display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }

/* ---------- M5：分享图弹层 ---------- */
.share-overlay {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(20,20,25,0.55); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center; padding: 18px;
}
.share-sheet {
  background: var(--card); border-radius: 22px; padding: 14px;
  width: 100%; max-width: 380px; max-height: 92vh; overflow: auto;
  box-shadow: 0 24px 70px rgba(0,0,0,0.35);
}
.share-sheet img { width: 100%; display: block; border-radius: 14px; border: 1px solid var(--line); }
.share-hint { text-align: center; font-size: 12.5px; color: var(--sub); margin: 11px 0 12px; }
.share-btns { display: flex; gap: 10px; }
.share-btns .btn { flex: 1; justify-content: center; }

/* 车辆图标注 */
#bike-wrap .dim-focus { transition: opacity 0.22s ease; }
/* 滑杆联动高亮（仅 .slider-hl 期间生效，避免与图解聚焦样式冲突） */
#bike-wrap.slider-hl .dim-focus.dimmed { opacity: 0.12; }
#bike-wrap.slider-hl .dim-focus.highlighted { opacity: 1; filter: drop-shadow(0 0 9px rgba(0,0,0,0.25)); }
/* 图解聚焦模式：目标组脉冲高亮、其余淡出、起止端点显现 */
#bike-wrap .dim-focus.focus-dim { opacity: 0.15; }
#bike-wrap .dim-focus.focus-hot { opacity: 1; animation: focusGlow 1.6s ease-in-out infinite; }
@keyframes focusGlow {
  0%,100% { filter: drop-shadow(0 0 4px rgba(255,45,85,0.28)); }
  50%      { filter: drop-shadow(0 0 15px rgba(255,45,85,0.60)); }
}
#bike-wrap .dim-end { opacity: 0; transition: opacity 0.2s ease; }
#bike-wrap .dim-focus.focus-hot .dim-end { opacity: 1; animation: endPulse 1.6s ease-in-out infinite; }
@keyframes endPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.45; } }

/* 抖动动画（非法提交） */
@keyframes shake { 0%,100% { transform: none; } 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
.shake { animation: shake 0.28s ease 2; border-color: var(--red) !important; }

/* ---------- M4：卡片透明展开 ---------- */
.big-card, .mini-card { cursor: pointer; position: relative; transition: box-shadow 0.18s ease, transform 0.18s ease, background 0.18s ease, border-color 0.18s ease; }
.big-card::after, .mini-card::after {
  content: '点击图解'; position: absolute; bottom: 10px; right: 14px;
  font-size: 10px; font-weight: 800; color: var(--faint); letter-spacing: 1px;
  opacity: 0.75; transition: color 0.15s;
}
.big-card:hover::after, .mini-card:hover::after { color: var(--pink); }
.big-card.open::after, .mini-card.open::after { content: '收起'; color: var(--pink); }
/* 图解聚焦选中态：淡品牌粉填充 + 同色描边（取代旧粉色外发光），与聚焦光晕/气泡同一色彩语言 */
.big-card.focus-active, .mini-card.focus-active {
  background: color-mix(in srgb, var(--pink) 32%, transparent);
  border-color: var(--pink);
}
.big-card.focus-active::after, .mini-card.focus-active::after { content: '再点收起'; color: var(--pink); }
.exp-body { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); cursor: default; }
.exp-formula { font-family: var(--mono); font-size: 12.5px; font-weight: 700;
  background: #f7f7fa; border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 12px; margin-bottom: 7px; overflow-x: auto; }
.exp-subst { font-family: var(--mono); font-size: 12px; color: var(--sub); line-height: 1.7;
  background: #fbfbfd; border: 1px dashed var(--line); border-radius: 10px;
  padding: 8px 12px; margin-bottom: 9px; overflow-x: auto; }
.exp-subst b { color: var(--ink); }
.exp-why { font-size: 12.5px; color: var(--sub); line-height: 1.65; }
.exp-why b { color: var(--ink); }
.exp-link { margin-top: 8px; border: none; background: none; color: var(--blue);
  font-size: 12.5px; font-weight: 700; padding: 0; }
.exp-link:hover { text-decoration: underline; }
.seg2 { display: flex; gap: 6px; margin-top: 8px; }
.seg2 button { flex: 1; border: 1.5px solid var(--line); background: #f9f9fb; border-radius: 10px;
  padding: 7px 6px; font-size: 12px; font-weight: 700; color: var(--sub); transition: all 0.15s; }
.seg2 button.active { background: var(--green); border-color: var(--green); color: #fff; }

/* ---------- M4：完整推导视图 ---------- */
.explain-wrap { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.ex-params { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.ex-params span { font-size: 11.5px; font-weight: 600; color: var(--sub);
  background: #f2f2f7; border-radius: 999px; padding: 4px 11px; }
.ex-params b { color: var(--ink); font-family: var(--mono); }
.ex-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.ex-head h4 { font-size: 15.5px; font-weight: 800; }
.ex-no { width: 26px; height: 26px; border-radius: 50%; background: var(--ink); color: #fff;
  font-size: 13px; font-weight: 800; display: flex; align-items: center; justify-content: center; flex: none; }
.ex-no.skip { background: var(--faint); }
.ex-ref { margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: var(--faint);
  background: #f2f2f7; padding: 3px 8px; border-radius: 6px; }
.ex-diagram { background: #fcfcfd; border: 1px solid var(--line); border-radius: 14px;
  margin: 10px 0; overflow: hidden; }
.ex-diagram svg { width: 100%; height: auto; display: block; }
.ex-tbl { width: 100%; border-collapse: collapse; font-size: 12.5px; margin: 8px 0 12px; }
.ex-tbl th, .ex-tbl td { border: 1px solid var(--line); padding: 7px 10px; text-align: center; }
.ex-tbl th { background: #f7f7fa; font-size: 11.5px; color: var(--sub); }
.ex-tbl td { font-family: var(--mono); }
.ex-tbl td.l { text-align: left; font-family: inherit; font-weight: 600; }
.ex-tbl td.ok { color: #1d8a3e; font-weight: 800; }
.ex-tbl tr.hit td { background: #fff8e6; font-weight: 800; }
.ex-tbl td.hit { background: #ffe9a8; outline: 2px solid var(--orange); outline-offset: -2px; }
.ex-tbl td.hit b { color: #c47b00; }

/* ---------- 新手简化：气泡 / 引导 / 重置 ---------- */
/* 图解气泡（全端：图示下方通栏紧贴，不遮挡图示） */
.bubble {
  position: static; width: auto; margin-top: 12px; z-index: 6;
  background: rgba(255,255,255,0.97); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: 0 12px 34px rgba(0,0,0,0.16); padding: 14px 16px 13px;
  animation: bubbleIn 0.22s ease;
}
@keyframes bubbleIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.bubble-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.bubble-head b { font-size: 14.5px; font-weight: 800; }
.bubble-x { flex: none; width: 24px; height: 24px; border: none; border-radius: 50%;
  background: #f2f2f7; color: var(--sub); font-size: 15px; line-height: 1; }
.bubble-x:hover { background: #e9e9ee; color: var(--ink); }
.bubble-fromto { margin: 9px 0 8px; font-size: 12px; font-weight: 700; line-height: 1.55;
  color: var(--pink); background: #fff0f3; border-radius: 9px; padding: 7px 10px; }
.bubble p { font-size: 12.5px; color: var(--sub); line-height: 1.65; }
.bubble .bubble-rel { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); color: var(--ink); }
.bubble-derive { margin-top: 10px; border: none; background: none; padding: 0;
  color: var(--blue); font-size: 12.5px; font-weight: 700; }
.bubble-derive:hover { text-decoration: underline; }

/* 配件微调 · 快捷区引导文案 */
.cock-guide { margin-top: 12px; font-size: 12px; line-height: 1.65; color: var(--sub);
  background: #f0f7ff; border: 1px solid #cfe4ff; border-radius: 10px; padding: 9px 12px; }
.cock-guide b { color: var(--blue); margin-right: 4px; }

/* 恢复默认小字入口（报告页 + 欢迎页共用） */
.reset-link { display: inline-block; margin-top: 14px; border: none; background: none; padding: 0;
  font-size: 12px; color: var(--faint); text-decoration: underline; text-underline-offset: 3px; }
.reset-link:hover { color: var(--red); }
#screen-welcome .reset-link { margin-top: 10px; }

/* 恢复默认确认弹层 */
#confirm-overlay { position: fixed; inset: 0; z-index: 95;
  background: rgba(20,20,25,0.5); backdrop-filter: blur(5px);
  display: flex; align-items: center; justify-content: center; padding: 20px; }
.confirm-box { background: var(--card); border-radius: 18px; padding: 22px;
  max-width: 340px; width: 100%; box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: bubbleIn 0.2s ease; }
.confirm-box p { font-size: 13.5px; line-height: 1.65; }
.confirm-actions { margin-top: 16px; display: flex; gap: 9px; }
.confirm-actions .btn { flex: 1; justify-content: center; }

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .measure-layout { grid-template-columns: 380px minmax(0,1fr); }
}
@media (max-width: 860px) {
  .steps { display: none; }
  /* 单列块级流：图示卡吸顶，字段卡从其下方穿过（grid 区域只有卡高，吸顶无效故改 block） */
  .measure-layout { display: block; }
  .figure-card { margin-bottom: 14px; transition: margin-bottom 0.25s ease; }
  /* 数字键盘弹出时临时取消吸顶，避免吸顶图示盖住聚焦的输入框 */
  body.kb-open .figure-card { position: static; }
  #figure-wrap svg { max-height: 62vh; transition: max-height 0.25s ease; }
  /* 上滑离开顶部后图示缩到 2/3（62vh→41vh）；卡片同步补 21vh 外边距保持页面总高不变，
     避免页面变短触发浏览器滚动钳制（假上滑信号会让顶栏误浮现）；回顶自动恢复 */
  .figure-card.figure-mini { margin-bottom: calc(14px + 21vh); }
  .figure-card.figure-mini #figure-wrap svg { max-height: 41vh; }
  .fig-tab { padding: 8px 15px; }
  /* 窄屏隐藏滑杆两端刻度，只留中间参考范围，避免文字碰撞 */
  .range-marks { justify-content: center; }
  .range-marks span:first-child, .range-marks span:last-child { display: none; }
  /* 测量卡重排：stepper 上到标题行右侧，滑杆独占整行（拖拽区翻倍）与加减按钮物理分离防误触 */
  .field-card { grid-template-columns: minmax(0,1fr) auto;
    grid-template-areas: "head num" "range range" "tip tip"; }
  /* 移动端滑杆热区加大：整体高度与拇指都放大，更易拖动 */
  input[type=range] { height: 32px; }
  input[type=range]::-webkit-slider-thumb { width: 26px; height: 26px; margin-top: -10px; }
  input[type=range]::-moz-range-thumb { width: 22px; height: 22px; }
  .pos-grid { grid-template-columns: 1fr; gap: 10px; }
  .pos-card { display: flex; align-items: stretch; }
  .pos-card img { width: 132px; aspect-ratio: 1/1; flex: none; align-self: center; }
  .pos-body { padding: 10px 14px 12px; }
  .result-sub { grid-template-columns: 1fr 1fr; }
  .result-main { grid-template-columns: 1fr; }
  /* 报告页回退单栏：图示卡吸顶，内容从其下方穿过（与改造前一致） */
  .result-layout { display: block; }
  .bike-card { margin-bottom: 14px; }
  .test-row { grid-template-columns: 1fr; }
  .welcome-hero h1 { font-size: 33px; }
  #app-header { padding: 10px 14px; }
  .screen { padding: 16px 14px 50px; }
  /* 推导视图表格：窄屏横向滚动，避免撑破卡片 */
  .ex-tbl-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 -4px; padding: 0 4px; }
  .ex-tbl th, .ex-tbl td { padding: 6px 8px; font-size: 11.5px; white-space: nowrap; }
}