/* ============================================================
   数智 Math Game · 样式（css/game.css）
   规范：无第三方字体/图片/图标库（零外部素材）；移动端优先；无横向滚动；
        尊重 prefers-reduced-motion；不以颜色单独传递信息。
   ============================================================ */

:root {
  --g-ink: #22303f;
  --g-ink-2: #55697e;
  --g-accent: #2b6cb0;
  --g-accent-2: #63a4e8;
  --g-ok: #2f855a;
  --g-bad: #c53030;
  --g-warn: #b7791f;
  --g-bg: #f4f8fd;
  --g-card: #ffffff;
  --g-line: #dbe6f3;
  --g-gold: #c8a24a;
  --g-huaxia-bg: #fbf3e4;
  --g-huaxia-ink: #2b2b2b;
  --g-huaxia-red: #b23a2f;
  --g-radius: 14px;
  --g-shadow: 0 2px 10px rgba(34, 48, 63, .07);
  --g-maxw: 1080px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body { margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--g-ink);
  background: var(--g-bg);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--g-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.mini { font-size: 14px; color: var(--g-ink-2); }
.ghost { color: #9fb0c2; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 10px; font-size: 12px;
  background: #e8f1fb; color: var(--g-accent); vertical-align: middle; }
.tag.ghost { background: #f1f4f8; color: var(--g-ink-2); }

/* ---------------- 顶栏 ---------------- */
.gm-top {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; background: #fff; border-bottom: 1px solid var(--g-line);
}
.gm-brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; color: var(--g-ink); }
.gm-brand .logo { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--g-accent), var(--g-accent-2)); color: #fff; font-size: 16px; }
.gm-top-mid { flex: 1; min-width: 0; display: flex; align-items: baseline; gap: 8px; overflow: hidden; }
.gm-gname { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gm-lname, .gm-bal { font-size: 14px; color: var(--g-ink-2); white-space: nowrap; }
.gm-top-right { display: flex; align-items: center; gap: 8px; }
.gm-back { font-size: 14px; white-space: nowrap; }

/* ---------------- 按钮 ---------------- */
.gm-btn {
  display: inline-block; border: 1px solid var(--g-line); background: #fff; color: var(--g-ink);
  border-radius: 10px; padding: 9px 16px; font-size: 15px; cursor: pointer; min-height: 40px;
  transition: transform .08s ease, box-shadow .12s ease;
}
.gm-btn:hover { box-shadow: var(--g-shadow); }
.gm-btn:active { transform: translateY(1px); }
.gm-btn.primary { background: var(--g-accent); border-color: var(--g-accent); color: #fff; font-weight: 600; }
.gm-btn.ghost { background: transparent; }
.gm-btn[disabled] { opacity: .55; cursor: not-allowed; }

/* ---------------- 首页 ---------------- */
.gm-hero { max-width: var(--g-maxw); margin: 0 auto; padding: 20px 14px 4px; }
.gm-hero h1 { font-size: 25px; margin: 0 0 6px; letter-spacing: .5px; }
.gm-hero .sub { font-size: 15px; color: var(--g-ink-2); margin: 0 0 12px; }
.gm-hero .pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.gm-pill { font-size: 13px; padding: 4px 10px; background: #fff; border: 1px solid var(--g-line); border-radius: 999px; color: var(--g-ink-2); }
.gm-pill b { color: var(--g-accent); }

.gm-wrap { max-width: var(--g-maxw); margin: 0 auto; padding: 8px 14px 40px; }

.gm-sec { margin: 18px 0 6px; }
.gm-sec h2 { font-size: 18px; margin: 0 0 4px; }
.gm-sec .sec-sub { font-size: 14px; color: var(--g-ink-2); margin: 0 0 10px; }

/* 栏目切换 */
.gm-cats { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 14px; }
.gm-cat {
  display: flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 999px;
  background: #fff; border: 1px solid var(--g-line); cursor: pointer; font-size: 15px; color: var(--g-ink);
}
.gm-cat.on { background: var(--g-accent); border-color: var(--g-accent); color: #fff; font-weight: 600; }
.gm-cat .n { font-size: 12px; opacity: .8; }

/* 游戏卡片 */
.gm-games { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.gm-game {
  background: var(--g-card); border: 1px solid var(--g-line); border-radius: var(--g-radius);
  padding: 14px; box-shadow: var(--g-shadow); display: flex; flex-direction: column; gap: 8px;
}
.gm-game.huaxia { background: var(--g-huaxia-bg); border-color: #e7d5ac; }
.gm-game.huaxia .g-name { color: var(--g-huaxia-red); }
.gm-game .g-head { display: flex; align-items: center; gap: 8px; }
.gm-game .g-emoji { font-size: 24px; }
.gm-game .g-name { font-weight: 700; font-size: 16px; }
.gm-game .g-meta { font-size: 13px; color: var(--g-ink-2); }
.gm-game .g-desc { font-size: 14px; color: var(--g-ink); min-height: 44px; }
.gm-game .g-prog { font-size: 13px; color: var(--g-ink-2); }
.gm-levels { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 2px; }
.gm-lv {
  border: 1px solid var(--g-line); background: #fff; border-radius: 10px; padding: 7px 11px;
  font-size: 14px; cursor: pointer; color: var(--g-ink); min-height: 40px;
}
.gm-lv .st { color: var(--g-gold); font-size: 13px; letter-spacing: -1px; }
.gm-lv .st.zero { color: #cdd8e4; }
.gm-lv:hover { border-color: var(--g-accent-2); }

/* 通用块 */
.gm-block { background: var(--g-card); border: 1px solid var(--g-line); border-radius: var(--g-radius); padding: 14px; box-shadow: var(--g-shadow); }
.gm-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.gm-rank-list { list-style: none; margin: 6px 0 0; padding: 0; }
.gm-rank-list li { display: flex; align-items: center; gap: 8px; padding: 6px 0; border-bottom: 1px dashed var(--g-line); font-size: 14px; }
.gm-rank-list li:last-child { border-bottom: 0; }
.gm-rank-list .r { width: 26px; color: var(--g-ink-2); }
.gm-rank-list .nm { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gm-rank-list .sc { color: var(--g-gold); font-weight: 600; }

.gm-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.gm-step-card { background: #fff; border: 1px solid var(--g-line); border-radius: 12px; padding: 12px; }
.gm-step-card .i { font-size: 20px; }
.gm-step-card b { display: block; margin: 4px 0 2px; }

.gm-tabs { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.gm-empty { padding: 28px 10px; text-align: center; color: var(--g-ink-2); font-size: 15px; }

/* ---------------- 闯关页 ---------------- */
.gm-play .gm-stage-wrap { max-width: var(--g-maxw); margin: 0 auto; padding: 10px 14px 30px; }
.gm-hud { margin-bottom: 8px; }
.gm-hud-line { font-size: 15px; color: var(--g-ink); font-weight: 600; }
.gm-play-grid { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 14px; align-items: start; }
.gm-stage { background: #fff; border: 1px solid var(--g-line); border-radius: var(--g-radius); padding: 14px; min-height: 380px; box-shadow: var(--g-shadow); }
.gm-panel { background: #fff; border: 1px solid var(--g-line); border-radius: var(--g-radius); padding: 12px; font-size: 14px; box-shadow: var(--g-shadow); }
.gm-panel-title { font-weight: 700; margin-bottom: 6px; }
.gm-panel-row { margin: 6px 0; color: var(--g-ink); }
.gm-panel-note { margin-top: 8px; padding: 6px 8px; background: #f0f7ff; border-radius: 8px; font-size: 13px; color: var(--g-accent); }

/* 口算过山车 */
.kousuan { display: flex; flex-direction: column; gap: 10px; }
.kousuan-track { position: relative; height: 34px; }
.kousuan-rail { position: absolute; left: 0; right: 6%; top: 22px; height: 4px; border-radius: 2px;
  background: repeating-linear-gradient(90deg, #cfe0f2 0 10px, #eaf2fb 10px 20px); }
.kousuan-cart { position: absolute; top: 0; left: 0; font-size: 22px; transition: left .28s ease; }
.kousuan-cart.go { transform: translateY(-4px) scale(1.1); }
.kousuan-card { text-align: center; padding: 14px 8px; background: #f8fbff; border-radius: 12px; }
.kousuan-expr { font-size: 34px; font-weight: 700; letter-spacing: 1px; }
.kousuan-ans { font-size: 26px; color: var(--g-accent); min-height: 40px; font-weight: 700; }
.kousuan-fb { min-height: 22px; font-size: 15px; }
.kousuan-fb.ok { color: var(--g-ok); }
.kousuan-fb.bad { color: var(--g-bad); }
.kousuan-pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 420px; margin: 0 auto; width: 100%; }
.kousuan-key {
  border: 1px solid var(--g-line); background: #fff; border-radius: 12px; font-size: 20px;
  padding: 12px 0; cursor: pointer; min-height: 52px; color: var(--g-ink);
}
.kousuan-key:active { background: #eef5fd; }
.kousuan-key.primary { background: var(--g-accent); border-color: var(--g-accent); color: #fff; font-weight: 700; }
.kousuan-key.ghost { background: #f6f8fb; }
.kousuan-tip { text-align: center; font-size: 14px; color: var(--g-warn); min-height: 22px; }

/* ---------------- 结算 / 登录浮层 ---------------- */
.gm-overlay { position: fixed; inset: 0; background: rgba(20, 32, 45, .45); display: grid; place-items: center; z-index: 50; padding: 14px; }
.gm-overlay[hidden] { display: none; }
.gm-result-card, .gm-login-card {
  background: #fff; border-radius: 16px; padding: 20px; width: 100%; max-width: 460px;
  max-height: 88vh; overflow: auto; box-shadow: 0 12px 40px rgba(20, 32, 45, .25);
}
.gm-result-stars { text-align: center; font-size: 40px; color: var(--g-gold); letter-spacing: 4px; line-height: 1.1; }
.gm-result-title { text-align: center; font-size: 19px; margin: 4px 0 12px; }
.gm-result-body { font-size: 15px; }
.gm-res-line { margin: 6px 0; }
.gm-res-line.big { font-size: 17px; color: var(--g-ok); }
.gm-res-line.warn { color: var(--g-warn); }
.gm-res-line.mini { font-size: 13px; color: var(--g-ink-2); }
.gm-result-btns { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 14px; }
.gm-explain-title { font-weight: 700; margin: 12px 0 6px; }
.gm-explain { border-top: 1px dashed var(--g-line); padding-top: 8px; margin-top: 8px; }
.gm-explain-h { font-size: 14px; font-weight: 600; }
.gm-step { font-size: 13px; color: var(--g-ink-2); margin-left: 4px; }
.gm-input { width: 100%; padding: 11px 12px; border: 1px solid var(--g-line); border-radius: 10px; font-size: 16px; margin-top: 8px; }
.gm-login-msg { min-height: 22px; font-size: 14px; color: var(--g-bad); margin-top: 6px; }
.gm-login-card h2 { font-size: 18px; margin: 0 0 4px; }
.gm-note { margin-top: 10px; }

/* ---------------- 提示条 ---------------- */
.gm-toast-box { position: fixed; left: 50%; bottom: 76px; transform: translateX(-50%); z-index: 90;
  display: flex; flex-direction: column; gap: 6px; align-items: center; pointer-events: none; }
.gm-toast { background: rgba(34, 48, 63, .92); color: #fff; padding: 8px 14px; border-radius: 999px;
  font-size: 14px; opacity: 0; transform: translateY(8px); transition: opacity .2s ease, transform .2s ease; max-width: 84vw; }
.gm-toast.on { opacity: 1; transform: translateY(0); }

/* ---------------- 页脚 ---------------- */
.gm-foot { max-width: var(--g-maxw); margin: 0 auto; padding: 16px 14px 40px; font-size: 13px; color: var(--g-ink-2);
  display: flex; flex-wrap: wrap; gap: 6px 16px; border-top: 1px solid var(--g-line); }
.gm-aigc { color: var(--g-ink-2); }
.gm-side { position: fixed; right: 12px; bottom: 12px; z-index: 40; display: flex; gap: 6px; }
.gm-side .gm-btn { padding: 8px 12px; font-size: 14px; box-shadow: var(--g-shadow); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 860px) {
  .gm-play-grid { grid-template-columns: 1fr; }
  .gm-cols { grid-template-columns: 1fr; }
  .gm-steps { grid-template-columns: 1fr; }
  .gm-hero h1 { font-size: 21px; }
  .gm-game .g-desc { min-height: 0; }
  .kousuan-expr { font-size: 28px; }
}
@media (max-width: 380px) {
  .gm-games { grid-template-columns: 1fr; }
  .kousuan-pad { gap: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}