/* ===== SpeedTest 网速测试 样式（独立一份；色板与科研导航站、Emoji、ImgCompress 一致） =====
   本页主角是一个表盘：
   ① 空闲态是居中的大 GO 圆按钮，运行态要「原地」变成表盘 + 实时读数，所以 GO 与读数层都绝对定位
      在同一块 .gauge-box 上，用 data-phase 切换显隐与缩放，避免布局跳动；
   ② 速率数字每 100 ms 刷新一次，字号与容器必须固定宽度（tabular-nums + min-width），否则数字一变整块就抖；
   ③ 结果卡在 360px 也要读：网格一律 minmax(0,1fr)，窄屏逐级降列，长单位串靠 overflow-wrap 兜住。 */
:root {
  --bg: #f5f6f8;
  --bg-card: #ffffff;
  --bg-hover: #f0f2f5;
  --text: #2c3e50;
  --text-sub: #7f8c9b;
  --border: #e8ebef;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, .1);
  --accent-text: #fff;
  --danger: #e2544d;
  --ok: #2f9e5f;
  --shadow: 0 2px 8px rgba(30, 40, 60, .06);
  --bar-bg: #f7f8fa;
  --code-bg: #f4f6f9;
  --tag-bg: #eef2f7;
}

html[data-theme="dark"] {
  --bg: #060a17;
  --bg-card: #0d1424;
  --bg-hover: #1a2336;
  --text: #dce3ec;
  --text-sub: #8794a8;
  --border: #1e2a44;
  --accent: #4d94ff;
  --accent-soft: rgba(77, 148, 255, .16);
  --danger: #ff6b64;
  --ok: #4ade80;
  --shadow: 0 2px 10px rgba(0, 0, 0, .5);
  --bar-bg: #0a1120;
  --code-bg: #101a30;
  --tag-bg: #16213a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
  transition: background .25s, color .25s;
}

/* ===== 顶栏 ===== */
.topbar {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 18px; background: var(--bar-bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.topbar .back { color: var(--accent); text-decoration: none; font-size: 14px; white-space: nowrap; }
.topbar .back:hover { text-decoration: underline; }
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { width: 34px; height: 34px; border-radius: 8px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; flex: none; }
.brand-mark img { width: 26px; height: 26px; }
.brand-text h1 { font-size: 17px; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brand-text p { font-size: 12px; color: var(--text-sub); line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.spacer { flex: 1; }
.icon-btn {
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text);
  border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 15px; line-height: 1;
}
.icon-btn:hover { background: var(--bg-hover); }
.lang-switch { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.lang-btn {
  border: none; background: var(--bg-card); color: var(--text-sub);
  padding: 6px 10px; font-size: 13px; cursor: pointer; text-decoration: none;
}
.lang-btn + .lang-btn { border-left: 1px solid var(--border); }
.lang-btn.active { background: var(--accent); color: var(--accent-text); }

/* ===== 通用控件 ===== */
.btn {
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text);
  border-radius: 8px; padding: 7px 12px; font-size: 13px; cursor: pointer;
}
.btn:hover { background: var(--bg-hover); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover { filter: brightness(1.05); }
.btn:disabled, .btn-primary:disabled { opacity: .45; cursor: not-allowed; filter: none; background: var(--bg-card); }
.mini {
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text);
  border-radius: 6px; padding: 3px 8px; font-size: 12px; cursor: pointer; line-height: 1.5;
}
.mini:hover { background: var(--bg-hover); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-size: .92em; }

/* ===== 主体骨架 ===== */
.speedtest { max-width: 1000px; margin: 0 auto; padding: 16px 16px 4px; }
.panel {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow); padding: 14px 16px; margin-bottom: 14px;
}

/* ===== 表盘舞台 ===== */
.stage {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow); padding: 18px 16px 14px; margin-bottom: 14px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.gauge-box { position: relative; width: 100%; max-width: 360px; aspect-ratio: 320 / 240; }
.gauge { width: 100%; height: 100%; display: block; overflow: visible; }
.g-track { fill: none; stroke: var(--border); stroke-width: 12; stroke-linecap: round; }
.g-prog {
  fill: none; stroke: var(--accent); stroke-width: 12; stroke-linecap: round;
  transition: stroke-dashoffset .18s linear;
}
.g-ticks line { stroke: var(--text-sub); stroke-width: 1.6; opacity: .55; }
.g-ticks text { fill: var(--text-sub); font-size: 11px; text-anchor: middle; }
/* 指针是贴着弧带内侧的一小段刻线（绕圆心旋转），不穿过圆心，所以中心的实时大数字不会被它压住 */
.g-needle { transform-box: view-box; transform-origin: 160px 150px; transition: transform .18s linear; }
.g-needle line { stroke: var(--danger); stroke-width: 5; stroke-linecap: round; }
.stage[data-phase="idle"] .g-prog, .stage[data-phase="idle"] .g-needle { opacity: .25; }

/* GO 按钮与实时读数叠在表盘圆心位置，切换只改显隐，不动布局 */
.go-layer, .read-layer {
  position: absolute; left: 50%; top: 62.5%; transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: 2px; text-align: center;
}
.read-layer { gap: 0; }
.go-btn {
  width: 132px; height: 132px; border-radius: 50%; cursor: pointer;
  border: 3px solid var(--accent); background: var(--accent-soft); color: var(--accent);
  font-size: 34px; font-weight: 700; letter-spacing: 1px; font-family: inherit;
  display: flex; align-items: center; justify-content: center;
  transition: transform .18s, background .18s, box-shadow .18s;
}
.go-btn:hover { transform: scale(1.04); background: var(--accent); color: var(--accent-text); box-shadow: 0 6px 22px var(--accent-soft); }
.go-btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.go-word { line-height: 1; }
.go-hint { font-size: 12.5px; color: var(--text-sub); margin-top: 6px; }
.read-val { font-size: 40px; font-weight: 700; line-height: 1.1; min-width: 4ch; }
.read-unit { font-size: 13px; color: var(--text-sub); }
.read-phase { font-size: 12.5px; color: var(--accent); margin-top: 2px; min-height: 1.2em; }

/* 运行态：GO 淡出、表盘亮起；结束态：读数停在最终值 */
.stage[data-phase="latency"] .go-layer, .stage[data-phase="download"] .go-layer,
.stage[data-phase="upload"] .go-layer, .stage[data-phase="error"] .go-layer,
.stage[data-phase="done"] .go-layer { visibility: hidden; opacity: 0; transform: translate(-50%, -50%) scale(.6); }
.stage[data-phase="latency"] .go-layer, .stage[data-phase="download"] .go-layer,
.stage[data-phase="upload"] .go-layer, .stage[data-phase="error"] .go-layer,
.stage[data-phase="done"] .go-layer { transition: opacity .2s, transform .2s; }
.stage[data-phase="idle"] .read-layer { display: none; }

.xfer-note { font-size: 12px; color: var(--text-sub); min-height: 1.2em; text-align: center; overflow-wrap: anywhere; }
.spark { width: 100%; max-width: 640px; height: 96px; display: block; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); }
.spark-cap { font-size: 11.5px; color: var(--text-sub); }

/* 失败状态：明确的文字 + 重试，绝不只留一个转圈的表盘 */
.notice {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px; justify-content: center;
  width: 100%; max-width: 640px; padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--danger); background: rgba(226, 84, 77, .07);
}
.notice[hidden] { display: none; }
.notice-body { flex: 1 1 260px; min-width: 0; }
.notice-title { font-size: 14px; font-weight: 700; color: var(--danger); }
.notice-text { font-size: 13px; color: var(--text); overflow-wrap: anywhere; }

/* ===== 阶段指示 ===== */
.phases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.ph {
  border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px;
  background: var(--bg); display: grid; grid-template-columns: auto 1fr; gap: 4px 8px; align-items: center;
}
.ph-idx {
  width: 20px; height: 20px; border-radius: 50%; background: var(--tag-bg); color: var(--text-sub);
  font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.ph-txt { font-size: 13px; color: var(--text-sub); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ph-bar { grid-column: 1 / -1; height: 4px; border-radius: 3px; background: var(--border); overflow: hidden; }
.ph-bar i { display: block; height: 100%; width: 0; background: var(--border); border-radius: 3px; transition: width .2s linear; }
.ph.on { border-color: var(--accent); background: var(--accent-soft); }
.ph.on .ph-txt { color: var(--accent); font-weight: 600; }
.ph.on .ph-idx { background: var(--accent); color: var(--accent-text); }
.ph.on .ph-bar i { background: var(--accent); }
.ph.done .ph-idx { background: var(--ok); color: #fff; }
.ph.done .ph-bar i { background: var(--ok); }
.ph.done .ph-txt { color: var(--text); }

.ctrls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; }
.unit-switch { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.unit-btn {
  border: none; background: var(--bg-card); color: var(--text-sub);
  padding: 6px 10px; font-size: 13px; cursor: pointer; font-family: inherit;
}
.unit-btn + .unit-btn { border-left: 1px solid var(--border); }
.unit-btn.active { background: var(--accent); color: var(--accent-text); }
.unit-note { font-size: 12px; color: var(--text-sub); margin-top: 8px; }

/* ===== 结果卡片 ===== */
.results { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 14px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow); padding: 12px 14px; min-width: 0;
}
.card-t { font-size: 12.5px; color: var(--text-sub); }
.card-v { display: flex; align-items: baseline; gap: 4px; margin-top: 2px; min-width: 0; }
.card-v span:first-child { font-size: 26px; font-weight: 700; overflow-wrap: anywhere; }
.card-u { font-size: 12px; color: var(--text-sub); white-space: nowrap; }
.card-s { font-size: 11.5px; color: var(--text-sub); margin-top: 4px; min-height: 1.2em; overflow-wrap: anywhere; }
.card[data-k="down"] .card-v span:first-child { color: var(--accent); }
.card[data-k="up"] .card-v span:first-child { color: var(--ok); }

/* ===== 历史 ===== */
.hist-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.hist-head h2 { font-size: 14px; }
.hist { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.hist li {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px;
  border: 1px solid var(--border); border-radius: 10px; padding: 7px 10px;
  background: var(--bg); font-size: 12.5px; color: var(--text); min-width: 0;
}
.hist .h-time { color: var(--text-sub); white-space: nowrap; }
.hist .h-nums { flex: 1 1 180px; min-width: 0; overflow-wrap: anywhere; }
.hist-empty { font-size: 12.5px; color: var(--text-sub); }
.hist li:empty { display: none; }

/* ===== 说明正文 ===== */
.doc {
  max-width: 900px; margin: 24px auto 40px; padding: 0 16px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow); padding: 22px 26px 26px;
}
.doc h2 { font-size: 18px; margin: 22px 0 8px; }
.doc h2:first-child { margin-top: 0; }
.doc p { margin: 8px 0; color: var(--text); }
.doc ul, .doc ol { margin: 8px 0 8px 22px; }
.doc li { margin: 6px 0; }
.doc li b { margin-right: 6px; }
.doc a { color: var(--accent); }
.doc code { background: var(--code-bg); padding: 1px 5px; border-radius: 5px; }
.faq dt { font-weight: 600; margin-top: 14px; }
.faq dd { margin: 4px 0 0; color: var(--text-sub); }
.ver { margin-top: 24px; font-size: 13px; color: var(--text-sub); text-align: center; }
.rel-links { display: flex; flex-wrap: wrap; gap: 8px 16px; list-style: none; margin-left: 0; }
.rel-links li { margin: 0; }
.rel-links a { color: var(--accent); text-decoration: none; }
.rel-links a:hover { text-decoration: underline; }

/* ===== 提示条 ===== */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  background: #1f2937; color: #fff; padding: 10px 18px; border-radius: 10px;
  font-size: 13px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
  z-index: 200; max-width: min(90vw, 560px); word-break: break-all;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ===== 响应式 ===== */
/* 窄屏优先保表盘可读：卡片先 4→2 列，再 2→1 列；阶段条始终三格并排（每格自己会收窄）。 */
@media (max-width: 900px) {
  .results { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc { padding: 18px 16px 20px; }
  .gauge-box { max-width: 320px; }
}
@media (max-width: 560px) {
  .results { grid-template-columns: 1fr; }
  .phases { gap: 6px; }
  .ph { padding: 6px 8px; }
  .ph-txt { font-size: 12px; }
  .brand-text p { display: none; }
  .go-btn { width: 112px; height: 112px; font-size: 28px; }
  .read-val { font-size: 32px; }
  .spark { height: 80px; }
  .ctrls .btn { flex: 1 1 auto; }
}

/* 尊重系统的「减少动效」：表盘指针与进度条的过渡直接关掉，数值仍然更新 */
@media (prefers-reduced-motion: reduce) {
  .g-prog, .g-needle, .ph-bar i, .go-btn, .toast { transition: none; }
}