/* =============================================================================
   无畏契约灵敏度测试工具 — 样式表
   -----------------------------------------------------------------------------
   设计原则：
   1. 零第三方依赖：不引入 Tailwind / Bootstrap / 字体 CDN，全部手写，可完全离线。
   2. 配色取自无畏契约（VALORANT）主视觉：深藏青底 + 高饱和红 + 米白文字。
   3. 电脑端为主（>=1024px 三栏式布局），兼容平板（768~1024px），
      手机端（<768px）显示提示条并降级为单列。
   4. 单位使用 rem，保证用户缩放浏览器字号时的可访问性。
   ============================================================================= */

/* ----------------------------- 1. 设计变量 ----------------------------- */
:root {
  /* 主色板 */
  --v-red:        #FF4655;   /* 无畏契约红 */
  --v-red-soft:   #FF6B77;
  --v-red-dim:    #B3262F;
  --v-red-glow:   rgba(255, 70, 85, .35);

  --bg:           #0F1923;   /* 主背景（藏青黑） */
  --bg-deep:      #0A1219;   /* 更深背景，用于交替区块 */
  --panel:        #16222E;   /* 卡片背景 */
  --panel-2:      #1C2B39;   /* 卡片内层/输入框背景 */
  --panel-3:      #223345;

  --line:         #2A3B4C;   /* 描边 */
  --line-soft:    #223140;

  --text:         #ECE8E1;   /* 主文字（米白） */
  --text-dim:     #A9B6C0;   /* 次要文字 */
  --text-muted:   #7C8B98;   /* 弱化文字 */

  --ok:           #48C78E;
  --warn:         #F0B429;

  /* 尺寸与节奏 */
  --wrap:         1220px;
  --radius:       4px;       /* 无畏契约风格偏直角 */
  --radius-lg:    6px;
  --gap:          1.25rem;
  --pad:          1.35rem;

  --shadow:       0 10px 30px rgba(0, 0, 0, .35);
  --shadow-sm:    0 3px 10px rgba(0, 0, 0, .28);

  --font: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
          "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "Cascadia Mono", "Consolas", "SFMono-Regular", "DejaVu Sans Mono",
               "Courier New", monospace;
}

/* ----------------------------- 2. 基础重置 ----------------------------- */
*, *::before, *::after { box-sizing: border-box; }

/* hidden 属性必须永远生效（重要，别删）
 * -----------------------------------------------------------------------------
 * 浏览器默认样式里的 [hidden]{display:none} 属于「UA 样式」，
 * 优先级低于任何作者样式 —— 也就是说只要某个元素在作者样式里写了 display，
 * 它的 hidden 属性就会被无视。
 * 本项目为此踩过三个真实的坑：
 *   · .error{display:flex}      → 没有错误时仍然显示出红色 ▲ 标记
 *   · .btn{display:inline-flex} → 「套用换算」「恢复上次保存」按钮无法隐藏
 *   · 全屏规则 .canvas-wrap:fullscreen .flow-panel{display:grid}
 *     （特异性 0,3,0 压过 .flow-panel[hidden] 的 0,2,0）
 *     → 全屏后结果/暂停面板永远显示：整块屏幕被 90% 不透明的遮罩盖住、
 *       面板不退出、并且吞掉所有点击（表现为"全屏后屏幕变暗 + 点不了靶"）
 * 因此这里用 !important 把 hidden 钉死。新增 CSS 时无需再操心这件事。
 * 回归测试：tools/check-site.js 会检查这条规则存在；端到端测试会逐个元素
 * 校验「带 hidden 的元素计算样式必须是 display:none」。
 * -------------------------------------------------------------------------- */
[hidden] { display: none !important; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* 顶部 sticky 导航高度补偿，避免锚点跳转被导航遮挡 */
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  background-color: var(--bg);
  /* 背景纹理：纯 CSS 渐变，无图片文件 */
  background-image:
    radial-gradient(900px 400px at 12% -8%, rgba(255, 70, 85, .10), transparent 62%),
    radial-gradient(700px 380px at 92% 4%, rgba(58, 122, 180, .08), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.25; font-weight: 700; }
p  { margin: 0 0 .65rem; }
ul, ol { margin: 0 0 .6rem; padding-left: 1.15rem; }
li { margin-bottom: .35rem; }
a  { color: var(--v-red-soft); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: var(--font-mono);
  font-size: .9em;
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  padding: .05em .35em;
  color: var(--text);
}
b, strong { color: #fff; font-weight: 700; }

:focus-visible {
  outline: 2px solid var(--v-red);
  outline-offset: 2px;
}

/* 仅供屏幕阅读器 */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--v-red); color: #fff; padding: .6rem 1rem;
  border-radius: 0 0 var(--radius) 0; font-weight: 700;
}
.skip-link:focus { left: 0; }

/* ----------------------------- 3. 布局容器 ----------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 3.2rem 0; border-top: 1px solid var(--line-soft); }
.section-alt { background: rgba(0, 0, 0, .22); }
.section:first-of-type { border-top: 0; }

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.6rem;
}
.section-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--v-red);
  line-height: 1.2;
  padding-top: .1rem;
  letter-spacing: .05em;
}
.section-head h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  letter-spacing: .04em;
  position: relative;
  padding-bottom: .5rem;
}
/* 标题下的红色短下划线：无畏契约式装饰 */
.section-head h2::after {
  content: "";
  position: absolute; left: 0; bottom: 0;
  width: 3.25rem; height: 3px;
  background: var(--v-red);
}
.section-desc {
  margin: .55rem 0 0;
  color: var(--text-dim);
  max-width: 78ch;
  font-size: .95rem;
}

.grid { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* ----------------------------- 4. 顶部导航 ----------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 19, 27, .88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 64px;
}
.brand { display: flex; align-items: center; gap: .7rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center;
  width: 36px; height: 36px;
  background: var(--v-red);
  color: #fff; font-weight: 800; font-size: 1.15rem;
  border-radius: var(--radius);
  /* 右上角切角，呼应无畏契约 UI 的斜切风格 */
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 1rem; letter-spacing: .02em; }
.brand-text small {
  font-family: var(--font-mono);
  font-size: .62rem; letter-spacing: .18em; color: var(--text-muted);
}
.site-nav { display: flex; gap: .35rem; flex-wrap: wrap; }
.site-nav a {
  color: var(--text-dim);
  font-size: .9rem;
  padding: .4rem .7rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: color .15s, border-color .15s, background .15s;
}
.site-nav a:hover {
  color: #fff; text-decoration: none;
  background: var(--panel);
  border-color: var(--line);
}

/* ----------------------------- 5. 小屏提示条 ----------------------------- */
.mobile-notice {
  display: none;                  /* 仅在小屏由媒体查询打开 */
  background: linear-gradient(90deg, var(--v-red-dim), var(--v-red));
  color: #fff;
}
.mobile-notice .wrap { padding-top: .8rem; padding-bottom: .8rem; }
.mobile-notice strong { display: block; font-size: .95rem; }
.mobile-notice p { margin: .25rem 0 .55rem; font-size: .85rem; opacity: .95; }
body.notice-dismissed .mobile-notice { display: none !important; }

/* ----------------------------- 6. 卡片 ----------------------------- */
.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--pad);
  box-shadow: var(--shadow-sm);
}
/* 卡片左上角的红色角标：用渐变模拟斜切高亮 */
.card::before {
  content: "";
  position: absolute; left: 0; top: 0;
  width: 38px; height: 2px;
  background: var(--v-red);
}
.card-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: .75rem; margin-bottom: 1rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--line-soft);
}
.card-head h3 { font-size: 1.05rem; letter-spacing: .03em; }

.tag {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--v-red-soft);
  background: rgba(255, 70, 85, .10);
  border: 1px solid rgba(255, 70, 85, .35);
  border-radius: 999px;
  padding: .15rem .55rem;
  white-space: nowrap;
}

/* ----------------------------- 7. 表单控件 ----------------------------- */
.field { margin-bottom: .8rem; }
.field label {
  display: block;
  font-size: .82rem;
  color: var(--text-dim);
  margin-bottom: .35rem;
  letter-spacing: .03em;
}
input[type="text"] {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .7rem .85rem;
  font-size: 1.05rem;
  font-family: var(--font-mono);
  letter-spacing: .02em;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
input[type="text"]::placeholder { color: #5C6B78; }
input[type="text"]:hover { border-color: #38516A; }
input[type="text"]:focus {
  outline: none;
  border-color: var(--v-red);
  background: #1A2836;
  box-shadow: 0 0 0 3px var(--v-red-glow);
}
input[type="text"].is-invalid {
  border-color: var(--v-red);
  box-shadow: 0 0 0 3px rgba(255, 70, 85, .18);
}
input[type="text"].is-valid { border-color: #2F4A3D; }

.help { font-size: .8rem; color: var(--text-muted); margin: .45rem 0 0; }
.error {
  font-size: .8rem; color: var(--v-red-soft); margin: .4rem 0 0;
  display: flex; align-items: center; gap: .3rem;
}
.error::before { content: "▲"; font-size: .6rem; }
/* 黄色变体：输入合法但超出常见范围时的「提示」，不阻止计算 */
.error.is-warn { color: var(--warn); }

/* 快捷按钮组 */
.chip-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: .4rem;
  margin-top: .55rem;
}
.chip-label { font-size: .78rem; color: var(--text-muted); margin-right: .1rem; }
.chip {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-dim);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .3rem .7rem;
  cursor: pointer;
  transition: all .15s;
}
.chip:hover { color: #fff; border-color: var(--v-red); background: var(--panel-3); }
.chip.is-active {
  color: #fff;
  background: var(--v-red);
  border-color: var(--v-red);
  font-weight: 700;
}

/* 灵敏度滑块 */
.slider-row {
  display: flex; align-items: center; gap: .6rem;
  margin-top: .7rem;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1 1 auto;
  min-width: 0;
  height: 22px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--line) 0%, var(--v-red-dim) 100%);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px; margin-top: -6px;
  border-radius: 50%;
  background: var(--v-red);
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px rgba(255, 70, 85, .25);
}
input[type="range"]::-moz-range-track {
  height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--line) 0%, var(--v-red-dim) 100%);
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--v-red); border: 2px solid #fff;
}

/* ----------------------------- 8. 按钮 ----------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  font-family: var(--font);
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .03em;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .58rem 1.05rem;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, transform .08s;
  white-space: nowrap;
}
.btn:hover { background: var(--panel-3); border-color: #3C5568; }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--v-red);
  border-color: var(--v-red);
  color: #fff;
}
.btn-primary:hover { background: var(--v-red-soft); border-color: var(--v-red-soft); }
.btn-small { font-size: .8rem; padding: .42rem .8rem; }
.btn-step {
  font-family: var(--font-mono);
  font-size: .8rem;
  padding: .35rem .55rem;
  min-width: 54px;
}
.btn[disabled] { opacity: .45; cursor: not-allowed; }

.action-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: .6rem;
  margin-top: 1.15rem;
}
.save-hint { font-size: .8rem; color: var(--text-muted); }

/* ----------------------------- 9. 结果区 ----------------------------- */
.result-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: var(--gap);
  align-items: stretch;
  margin-bottom: var(--gap);
}
.card-primary {
  background:
    linear-gradient(160deg, rgba(255, 70, 85, .14), transparent 55%),
    var(--panel);
  border-color: #3A2A33;
  display: flex; flex-direction: column;
}
.card-primary::before { width: 64px; height: 3px; }
.card-label {
  font-size: .78rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--text-muted);
}
.big-number {
  display: flex; align-items: baseline; gap: .5rem;
  margin: .4rem 0 .1rem;
}
.big-number #out-edpi {
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 6vw, 3.9rem);
  font-weight: 700;
  line-height: 1.05;
  color: #fff;
  letter-spacing: -.02em;
  word-break: break-all;
}
.big-number .unit { font-size: 1.05rem; color: var(--v-red-soft); font-weight: 700; }
.formula {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-muted);
  margin: 0 0 .7rem;
}
.band-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: .84rem;
  font-weight: 600;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--v-red);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: .4rem .7rem;
  margin: 0 0 1rem;
}

/* eDPI 刻度条 */
.meter { margin-top: auto; }
.meter-track {
  position: relative;
  display: flex;
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel-2);
}
.meter-zone { height: 100%; }
.zone-low  { flex: 25; background: #33414E; }   /* 0~200 */
.zone-pro  { flex: 25; background: var(--v-red); } /* 200~400 */
.zone-high { flex: 50; background: #4A3B44; }    /* 400~800+ */
.meter-marker {
  position: absolute; top: -4px; bottom: -4px;
  width: 3px;
  background: #fff;
  box-shadow: 0 0 8px rgba(255, 255, 255, .8);
  transform: translateX(-1.5px);
  transition: left .12s linear;
}
.meter-scale {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: .68rem; color: var(--text-muted);
  margin-top: .3rem;
}
.meter-note { font-size: .76rem; color: var(--text-muted); margin: .5rem 0 0; }
.c-pro { color: var(--v-red-soft); }

/* 统计小卡 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
}
.stat { display: flex; flex-direction: column; padding: 1.05rem 1.1rem; }
.stat-label {
  font-size: .74rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-muted);
}
.stat-value {
  display: flex; align-items: baseline; gap: .25rem;
  font-family: var(--font-mono);
  font-size: 1.7rem; font-weight: 700; color: #fff;
  margin: .3rem 0 .35rem;
  line-height: 1.1;
}
.stat-value small { font-size: .8rem; color: var(--text-dim); font-weight: 500; }
.stat-desc { font-size: .76rem; color: var(--text-muted); line-height: 1.5; margin: 0; }

/* 数据表 */
.table-scroll { overflow-x: auto; margin: .3rem 0 .5rem; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
.data-table th, .data-table td {
  text-align: left;
  padding: .5rem .6rem;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.data-table thead th {
  color: var(--text-dim);
  font-size: .76rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.data-table tbody th { color: #fff; font-weight: 600; white-space: nowrap; }
.data-table td[data-cell] { font-family: var(--font-mono); color: #fff; white-space: nowrap; }
.data-table tr.is-current { background: rgba(255, 70, 85, .12); }
.data-table tr.is-current th { color: var(--v-red-soft); }
.data-table td.mono { font-family: var(--font-mono); }
/* 可点击的参考行：点击即可把该配置套用到输入框 */
.data-table tbody tr.is-clickable { cursor: pointer; transition: background .15s; }
.data-table tbody tr.is-clickable:hover { background: rgba(255, 70, 85, .10); }
.data-table tbody tr.is-clickable:hover th { color: var(--v-red-soft); }
.data-table tbody tr.is-clickable:active { background: rgba(255, 70, 85, .18); }

/* 换算结果 */
.conv-result {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin: 1rem 0 .4rem;
}
.conv-item {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--v-red);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: .6rem .8rem;
}
.conv-label { display: block; font-size: .74rem; color: var(--text-muted); letter-spacing: .04em; }
.conv-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem; font-weight: 700; color: #fff;
  word-break: break-all;
}

/* ----------------------------- 10. 测试画布区 ----------------------------- */
.test-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: .75rem; margin-bottom: .9rem;
}
.mode-group {
  display: inline-flex; gap: .3rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .22rem;
}
.mode-btn {
  font-family: var(--font);
  font-size: .85rem; font-weight: 600;
  color: var(--text-dim);
  background: transparent;
  border: 0; border-radius: 3px;
  padding: .45rem .85rem;
  cursor: pointer;
  transition: all .15s;
}
.mode-btn:hover { color: #fff; background: var(--panel-3); }
.mode-btn.is-active { color: #fff; background: var(--v-red); }
.toolbar-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }

.canvas-wrap {
  position: relative;
  background: #070C11;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
#range-canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 620;   /* 与 canvas 内部坐标系比例一致 */
  cursor: grab;
  touch-action: none;         /* 触屏拖动时不滚动页面 */
  background: #070C11;
}
#range-canvas.is-locked { cursor: none; }
#range-canvas.is-dragging { cursor: grabbing; }
#range-canvas:focus-visible { outline: 2px solid var(--v-red); outline-offset: -2px; }

.canvas-overlay {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: rgba(7, 12, 17, .76);
  backdrop-filter: blur(2px);
  padding: 1rem;
  text-align: center;
}
.canvas-overlay[hidden] { display: none; }
.overlay-box { max-width: 30rem; }
.overlay-box strong { display: block; font-size: 1.05rem; color: var(--v-red-soft); margin-bottom: .35rem; }
.overlay-box p { font-size: .85rem; color: var(--text-dim); margin: 0; }

.canvas-hud {
  position: absolute; left: 0; right: 0;
  /* 画布顶部 0~30px 是程序化绘制的方位罗盘，HUD 必须让开，否则文字压在刻度上 */
  top: 32px;
  display: flex; flex-wrap: wrap; gap: .15rem 1.1rem;
  padding: .4rem .8rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--text-dim);
  background: linear-gradient(180deg, rgba(7, 12, 17, .55), transparent);
  pointer-events: none;
}
.canvas-hud b { color: #fff; font-weight: 700; }
.hud-item[hidden] { display: none; }

.canvas-tip {
  position: absolute; left: 0; right: 0; bottom: 0;
  margin: 0;
  padding: .5rem .8rem;
  font-size: .76rem;
  color: var(--text-muted);
  background: linear-gradient(0deg, rgba(7, 12, 17, .9), transparent);
  pointer-events: none;
}
.canvas-tip.is-warn { color: var(--v-red-soft); }

/* 画布下方读数 */
.readout-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: var(--gap);
}
.readout {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--v-red);
  border-radius: var(--radius);
  padding: .85rem 1rem;
}
.readout-label {
  display: block;
  font-size: .74rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-muted);
}
.readout-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.55rem; font-weight: 700; color: #fff;
  margin: .25rem 0 .2rem;
  line-height: 1.15;
}
.readout-value small { font-size: .78rem; color: var(--text-dim); margin-left: .15rem; }
.readout-sub { display: block; font-size: .74rem; color: var(--text-muted); line-height: 1.45; }

/* =============================================================================
   11. 灵敏度测试流程（全屏引导式测试）
   -----------------------------------------------------------------------------
   页面上的结构：
     .flow-launcher   测试入口卡片（强度 / 鼠标垫宽度 / 开始按钮）——页面上唯一需要操作的地方
     .manual-modes    手动模式（折叠，可选）
     画布内：倒计时浮层、实时读数条、暂停/结果报告面板（全屏内显示）
   ============================================================================= */

/* ---- 测试入口卡片：设置项与开始按钮集中在这里 ---- */
.flow-launcher {
  display: flex; flex-direction: column; gap: 1rem;
  background:
    linear-gradient(120deg, rgba(255, 70, 85, .13), transparent 58%),
    var(--panel);
  border: 1px solid #3A2A33;
  border-left: 4px solid var(--v-red);
  border-radius: var(--radius);
  padding: 1.3rem 1.45rem;
  margin-bottom: 1.15rem;
}
.flow-launcher-head h3 {
  font-size: 1.2rem; letter-spacing: .03em;
  display: flex; align-items: center; gap: .5rem;
}
.flow-launcher-head p {
  margin: .5rem 0 0; font-size: .9rem; color: var(--text-dim); max-width: 78ch;
}
.tag-hot { color: #fff; background: var(--v-red); border-color: var(--v-red); }
.btn-large { font-size: .95rem; padding: .72rem 1.55rem; }

/* 设置区：强度（三档）+ 鼠标垫宽度 */
.flow-launcher-config {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(0, 1fr);
  gap: 1.2rem 1.6rem;
  align-items: start;
}
.flow-config-label {
  display: block;
  font-size: .78rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: .5rem;
}
.flow-optional {
  text-transform: none; letter-spacing: 0;
  font-size: .72rem; color: var(--v-red-soft);
  margin-left: .4rem;
}
.flow-pad-row { display: flex; align-items: center; gap: .5rem; max-width: 12rem; }
.flow-pad-row input[type="text"] { flex: 1 1 auto; }

/* 强度选择：三个胶囊按钮 */
.flow-pills { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .6rem; }
.flow-pill {
  position: relative;
  display: block; cursor: pointer;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .7rem .85rem;
  transition: border-color .15s, background .15s, transform .1s;
}
.flow-pill:hover { border-color: #3C5568; }
.flow-pill:active { transform: translateY(1px); }
.flow-pill input { position: absolute; opacity: 0; pointer-events: none; }
.flow-pill.is-active {
  border-color: var(--v-red);
  background: rgba(255, 70, 85, .12);
  box-shadow: inset 0 0 0 1px rgba(255, 70, 85, .35);
}
.flow-pill-title {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: .5rem; font-weight: 700; color: #fff; font-size: .95rem;
}
.flow-pill.is-active .flow-pill-title { color: #fff; }
.flow-pill-title em {
  font-style: normal; font-family: var(--font-mono);
  font-size: .72rem; color: var(--v-red-soft);
}
.flow-pill-desc { display: block; margin-top: .28rem; font-size: .74rem; color: var(--text-muted); }
/* 键盘可达性：焦点落在隐藏的 radio 上时，给可见胶囊加轮廓 */
.flow-pill:focus-within { outline: 2px solid var(--v-red); outline-offset: 2px; }

/* 底部：要点 + 开始按钮 */
.flow-launcher-foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: .9rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
}
.flow-launcher-facts {
  display: flex; flex-direction: column; gap: .2rem;
  font-size: .78rem; color: var(--text-muted);
}
.flow-launcher-facts b { color: #fff; font-family: var(--font-mono); }
.flow-launcher-note {
  margin: 0; font-size: .78rem; color: var(--warn);
}
.flow-launcher-note[hidden] { display: none; }

/* ---- 手动模式（折叠）：不参与评分 ---- */
.manual-modes {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 1.15rem;
}
.manual-modes > summary {
  cursor: pointer; list-style: none;
  padding: .85rem 1.1rem;
  font-size: .88rem; font-weight: 600; color: var(--text-dim);
  display: flex; align-items: center; gap: .55rem;
}
.manual-modes > summary::-webkit-details-marker { display: none; }
.manual-modes > summary::before {
  content: "+"; font-family: var(--font-mono); color: var(--v-red);
  width: 1rem; text-align: center;
}
.manual-modes[open] > summary::before { content: "−"; }
.manual-modes > summary:hover { color: #fff; }
.manual-body { padding: 0 1.1rem 1.1rem; border-top: 1px solid var(--line-soft); padding-top: 1rem; }

/* ---- 测试进行中的实时读数条 ---- */
.drill-strip {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; flex-wrap: wrap; gap: .3rem 1.2rem;
  align-items: center;
  padding: .55rem .9rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text-dim);
  background: linear-gradient(0deg, rgba(7, 12, 17, .94), rgba(7, 12, 17, .55));
  border-top: 1px solid rgba(255, 70, 85, .35);
  pointer-events: none;
}
.drill-strip[hidden] { display: none; }
.drill-item b { color: #fff; }
.drill-progress { color: var(--v-red-soft); }

/* 流程进行中：隐藏操作提示与常规 HUD，避免干扰 */
body.flow-running .canvas-tip { display: none; }
body.flow-running .canvas-hud { opacity: .35; }
body.flow-active .mode-group { opacity: .45; pointer-events: none; }

/* ---- 倒计时浮层 ----
   早期版本用 0.82 的整屏黑色遮罩，每次档位/子测试前都要黑一次屏，
   全屏下观感就是「屏幕一阵阵发暗」。现在改成中心透明的柔和压暗：
   既保证倒计时数字可读，也不遮住靶区。 */
.flow-countdown {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: radial-gradient(circle at 50% 42%,
              rgba(7, 12, 17, .18) 0%,
              rgba(7, 12, 17, .52) 55%,
              rgba(7, 12, 17, .74) 100%);
  text-align: center;
  padding: 1rem;
  /* 纯提示层：绝不能拦截鼠标事件（否则拖拽模式下的转向会被它吞掉） */
  pointer-events: none;
}
.flow-countdown[hidden] { display: none; }
/* 内容整体上移，避免数字正好压住准星与靶心 */
.flow-cd-inner { transform: translateY(-14%); }
.flow-cd-sens { font-size: .85rem; color: var(--text-dim); font-family: var(--font-mono); }
.flow-cd-num {
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 11vw, 7rem);
  font-weight: 800;
  line-height: 1;
  color: #fff;
  margin: .5rem 0 .7rem;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .9), 0 0 34px var(--v-red-glow);
}
.flow-cd-num.is-pop { animation: cd-pop .42s ease-out; }
@keyframes cd-pop {
  from { transform: scale(1.42); opacity: .25; }
  to   { transform: scale(1);    opacity: 1; }
}
.flow-cd-label { font-size: 1rem; color: var(--text); }

/* ---- 准备 / 暂停 / 报告 面板 ---- */
.flow-panel {
  position: absolute; inset: 0;
  background: rgba(7, 12, 17, .9);
  overflow-y: auto;
  padding: 1.1rem;
  -webkit-overflow-scrolling: touch;
}
.flow-panel[hidden] { display: none; }
.flow-card {
  max-width: 60rem;
  margin: 0 auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--v-red);
  border-radius: var(--radius);
  padding: 1.35rem 1.5rem 1.5rem;
  box-shadow: var(--shadow);
}
.flow-head { margin-bottom: 1.1rem; }
.flow-head h3 { font-size: 1.3rem; letter-spacing: .03em; }
.flow-head p { margin: .45rem 0 0; font-size: .88rem; color: var(--text-dim); max-width: 76ch; }
.flow-block {
  border-top: 1px solid var(--line-soft);
  padding-top: .95rem;
  margin-top: .95rem;
}
.flow-block h4 {
  font-size: .92rem; color: #fff; margin-bottom: .5rem;
  letter-spacing: .04em;
}
.flow-steps { margin: 0; padding-left: 1.15rem; font-size: .87rem; color: var(--text-dim); }
.flow-steps li { margin-bottom: .4rem; }
.flow-list { margin: 0; padding-left: 1.15rem; font-size: .86rem; color: var(--text-dim); }
.flow-list li { margin-bottom: .4rem; }
.flow-note { font-size: .78rem; color: var(--text-muted); margin: .5rem 0 0; }
.flow-tip { font-size: .76rem; color: var(--text-muted); margin: 1rem 0 0; }
.flow-warn { color: var(--warn); }
kbd {
  font-family: var(--font-mono); font-size: .78em;
  background: var(--bg-deep); border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 3px;
  padding: .05em .35em; color: var(--text);
}

/* 单位后缀（鼠标垫宽度） */
.flow-unit { font-family: var(--font-mono); font-size: .85rem; color: var(--text-muted); }

/* 元信息 */
.flow-meta {
  display: flex; flex-wrap: wrap; gap: .4rem 1.6rem;
  font-size: .84rem; color: var(--text-dim);
}
.flow-meta b { color: #fff; }

/* 动作按钮组 */
.flow-actions {
  display: flex; flex-wrap: wrap; gap: .6rem;
  margin-top: 1.3rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { color: #fff; }

/* 推荐结论框 */
.flow-reco-box {
  border: 1px solid var(--line);
  border-left: 4px solid var(--v-red);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--panel-2);
  padding: 1.05rem 1.15rem;
}
.flow-reco-box.is-ok { border-left-color: var(--ok); }
.flow-reco-box.is-warn { border-left-color: var(--warn); }
.flow-reco-value { display: flex; flex-wrap: wrap; align-items: baseline; gap: .7rem; }
.flow-reco-label {
  font-size: .74rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--text-muted); width: 100%;
}
.flow-reco-value strong {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.9rem);
  font-weight: 800; color: #fff; line-height: 1;
}
.flow-reco-sub { font-family: var(--font-mono); font-size: .84rem; color: var(--text-dim); }
.flow-verdict { font-size: .9rem; color: var(--text); margin: .8rem 0 .35rem; }
.flow-confidence { font-size: .78rem; color: var(--text-muted); margin: 0; }

/* 成绩表 */
.flow-table th, .flow-table td { white-space: nowrap; }
.flow-table tr.is-reco { background: rgba(255, 70, 85, .12); }
.flow-table tr.is-reco th { color: var(--v-red-soft); }
.flow-score { font-weight: 700; color: #fff; }
.flow-badge-cur {
  font-style: normal; font-size: .64rem; font-family: var(--font-mono);
  background: var(--line); color: var(--text);
  border-radius: 999px; padding: .05rem .4rem; margin-left: .35rem;
}

/* ---- 全屏模式：这是测试流程真正的舞台 ---- */
.canvas-wrap:fullscreen,
.canvas-wrap:-webkit-full-screen {
  width: 100vw; height: 100vh;
  border: 0; border-radius: 0;
  background: #070C11;
}
.canvas-wrap:fullscreen #range-canvas,
.canvas-wrap:-webkit-full-screen #range-canvas {
  width: 100%; height: 100%;
  aspect-ratio: auto;         /* 全屏时铺满整屏，不再锁定 1200:620 */
}
/* 全屏下把读数条做得更醒目（这是测试中唯一需要盯的数据） */
.canvas-wrap:fullscreen .drill-strip,
.canvas-wrap:-webkit-full-screen .drill-strip {
  font-size: .95rem;
  padding: .85rem 1.4rem;
  gap: .4rem 1.8rem;
  justify-content: center;
  border-top-width: 2px;
}
.canvas-wrap:fullscreen .drill-progress,
.canvas-wrap:-webkit-full-screen .drill-progress { font-weight: 700; }
/* 全屏下 HUD 淡化，避免和读数条抢注意力 */
.canvas-wrap:fullscreen .canvas-hud,
.canvas-wrap:-webkit-full-screen .canvas-hud { opacity: .5; }
/* 全屏下的暂停/结果面板：居中 + 留出上下呼吸空间。
   注意用 :not([hidden]) —— 面板在测试进行中必须是隐藏的，
   否则它会盖住整个画面并吞掉点击（这个坑踩过一次了）。 */
.canvas-wrap:fullscreen .flow-panel:not([hidden]),
.canvas-wrap:-webkit-full-screen .flow-panel:not([hidden]) {
  display: grid; place-items: start center;
  padding: 3vh 1.2rem;
}
.canvas-wrap:fullscreen .flow-card,
.canvas-wrap:-webkit-full-screen .flow-card {
  max-width: 72rem;
  width: 100%;
}
.canvas-wrap:fullscreen .flow-head h3,
.canvas-wrap:-webkit-full-screen .flow-head h3 { font-size: 1.5rem; }
.canvas-wrap:fullscreen .flow-reco-value strong,
.canvas-wrap:-webkit-full-screen .flow-reco-value strong { font-size: 3.2rem; }
/* 全屏下倒计时更大 */
.canvas-wrap:fullscreen .flow-cd-num,
.canvas-wrap:-webkit-full-screen .flow-cd-num { font-size: clamp(4.5rem, 16vw, 11rem); }
.canvas-wrap:fullscreen .flow-cd-label,
.canvas-wrap:-webkit-full-screen .flow-cd-label { font-size: 1.15rem; }
/* 全屏下提示上移，别压住底部读数条 */
.canvas-wrap:fullscreen .toast-region,
.canvas-wrap:-webkit-full-screen .toast-region { bottom: 5.5rem; }

/* ----------------------------- 12. 折叠区块（指引/知识） ----------------------------- */
.guide, .knowledge details {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-top: var(--gap);
  padding: 0;
}
.guide > summary, .knowledge details > summary {
  cursor: pointer;
  list-style: none;
  padding: .9rem 1.1rem;
  font-weight: 700;
  font-size: .95rem;
  color: var(--text);
  display: flex; align-items: center; gap: .6rem;
  transition: color .15s, background .15s;
}
.guide > summary::-webkit-details-marker,
.knowledge details > summary::-webkit-details-marker { display: none; }
.guide > summary::before, .knowledge details > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--v-red);
  width: 1rem; text-align: center;
  flex: 0 0 auto;
}
.guide[open] > summary::before, .knowledge details[open] > summary::before { content: "−"; }
.guide > summary:hover, .knowledge details > summary:hover { background: var(--panel-2); }
.guide-body, .knowledge-body {
  padding: 0 1.1rem 1.05rem;
  border-top: 1px solid var(--line-soft);
  margin-top: 0;
  padding-top: .9rem;
  font-size: .9rem;
  color: var(--text-dim);
}
.guide-list { padding-left: 1.1rem; }
.guide-list > li { margin-bottom: .75rem; }
.guide-note {
  font-size: .8rem; color: var(--text-muted);
  border-left: 3px solid var(--line);
  padding-left: .7rem;
  margin: .8rem 0 0;
}
/* 指引顶部的引导框：把用户引向流程测试 */
.guide-callout {
  background: rgba(255, 70, 85, .09);
  border-left: 3px solid var(--v-red);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: .65rem .85rem;
  margin-bottom: .9rem;
  font-size: .86rem;
  color: var(--text);
}
.knowledge { margin-top: var(--gap); }
.knowledge details {
  margin-top: .55rem;
  background: var(--panel-2);
}
.knowledge details > summary { font-size: .92rem; }
.example {
  background: rgba(255, 70, 85, .08);
  border-left: 3px solid var(--v-red);
  padding: .55rem .8rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
  font-size: .86rem;
}
.note {
  font-size: .84rem; color: var(--text-muted);
  border-top: 1px dashed var(--line); padding-top: .6rem;
}
.formula-block {
  font-family: var(--font-mono);
  font-size: .84rem;
  color: var(--text);
  background: var(--bg-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .7rem .85rem;
  line-height: 1.9;
}
.faq dt { font-weight: 700; color: #fff; margin-top: .8rem; }
.faq dt:first-child { margin-top: 0; }
.faq dd { margin: .25rem 0 0; padding-left: 0; }

/* ----------------------------- 13. 页脚 ----------------------------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-deep);
  padding: 2rem 0;
  margin-top: 1rem;
}
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 1.2rem;
  justify-content: space-between; align-items: flex-start;
}
.footer-title { font-weight: 700; color: #fff; margin: 0; }
.footer-desc { font-size: .8rem; color: var(--text-muted); margin: .2rem 0 0; }
.footer-meta { max-width: 52ch; font-size: .76rem; color: var(--text-muted); }
.footer-meta p { margin: 0 0 .3rem; }

/* ----------------------------- 14. 轻提示 Toast ----------------------------- */
.toast-region {
  position: fixed; right: 1.2rem; bottom: 1.2rem; z-index: 999;
  display: flex; flex-direction: column; gap: .5rem;
  pointer-events: none;
}
.toast {
  background: var(--panel-3);
  border: 1px solid var(--line);
  border-left: 3px solid var(--v-red);
  border-radius: var(--radius);
  padding: .6rem .9rem;
  font-size: .85rem;
  color: var(--text);
  box-shadow: var(--shadow);
  animation: toast-in .18s ease-out;
}
.toast.is-ok { border-left-color: var(--ok); }
.toast.is-warn { border-left-color: var(--warn); }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

/* ----------------------------- 15. 响应式 ----------------------------- */
/* 平板 / 小笔记本 */
@media (max-width: 1080px) {
  .result-top { grid-template-columns: minmax(0, 1fr); }
  .readout-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .section { padding: 2.4rem 0; }
  .site-nav { display: none; }          /* 小屏隐藏导航，锚点仍可用 */
  .header-inner { min-height: 58px; }
  .flow-pills { grid-template-columns: minmax(0, 1fr); }     /* 强度选择改单列 */
  .flow-launcher-config { grid-template-columns: minmax(0, 1fr); }
  .flow-launcher-foot { flex-direction: column; align-items: stretch; }
  .flow-launcher-foot .btn { width: 100%; }
}

/* 手机：显示提示条 */
@media (max-width: 760px) {
  body { font-size: 15px; }
  .mobile-notice { display: block; }
  .wrap { padding: 0 1rem; }
  .stat-grid { grid-template-columns: minmax(0, 1fr); }
  .readout-grid { grid-template-columns: minmax(0, 1fr); }
  .conv-result { grid-template-columns: minmax(0, 1fr); }
  .section-head { gap: .7rem; }
  .section-index { font-size: 1.15rem; }
  .test-toolbar { flex-direction: column; align-items: stretch; }
  .mode-group { width: 100%; }
  .mode-btn { flex: 1 1 0; }
  .toast-region { left: 1rem; right: 1rem; bottom: 1rem; }
  .mobile-notice-hide { display: none; }
  /* 测试流程：面板内边距收紧，倒计时字号跟随屏幕 */
  .flow-card { padding: 1rem 1rem 1.15rem; }
  .flow-panel { padding: .6rem; }
  .flow-actions .btn { flex: 1 1 100%; }
  .drill-strip { font-size: .72rem; gap: .2rem .8rem; }
}

/* 超大屏：略微放宽留白 */
@media (min-width: 1500px) {
  :root { --wrap: 1320px; }
}

/* 打印：去掉装饰，节省墨水 */
@media print {
  .site-header, .mobile-notice, .test-toolbar, .canvas-wrap, .toast-region { display: none !important; }
  body { background: #fff; color: #000; }
  .card { border-color: #ccc; box-shadow: none; }
}

/* 尊重系统的「减少动态效果」设置 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}