/* ===================================================================
   科目一刷题 · 站点样式
   设计变量集中在 :root 与 [data-theme]，支持系统/手动明暗
   =================================================================== */
:root{
  --fg:#152238; --dim:#6b7c96; --line:rgba(16,32,64,.10);
  --acc:#2f6bff; --acc2:#5b8dff;
  --ok:#12a45f; --bad:#e8434f; --warn:#c9790c;
  --glass:rgba(255,255,255,.66); --glass2:rgba(255,255,255,.46);
  --card:rgba(255,255,255,.72); --card2:rgba(255,255,255,.5);
  --btn:linear-gradient(180deg,rgba(255,255,255,.95),rgba(255,255,255,.64));
  --sh:0 8px 28px rgba(24,48,92,.10); --sh2:0 2px 8px rgba(24,48,92,.07);
  --bg1:#dbe8ff; --bg2:#ffe7f1; --bg3:#dff6ec; --bg4:#fff3dc;
  --radius:16px;
}
[data-theme="dark"]{
  --fg:#e8eefb; --dim:#8fa0bd; --line:rgba(160,190,240,.16);
  --acc:#5b8dff; --acc2:#7aa6ff;
  --glass:rgba(22,30,48,.72); --glass2:rgba(22,30,48,.5);
  --card:rgba(24,33,52,.8); --card2:rgba(24,33,52,.55);
  --btn:linear-gradient(180deg,rgba(48,62,92,.95),rgba(34,45,70,.85));
  --sh:0 10px 32px rgba(0,0,0,.4); --sh2:0 2px 8px rgba(0,0,0,.3);
  --bg1:#16223c; --bg2:#2a1d33; --bg3:#122c26; --bg4:#2c2618;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
html,body{margin:0;padding:0}
body{
  color:var(--fg);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:
    radial-gradient(900px 620px at 8% -12%, var(--bg1) 0%, transparent 62%),
    radial-gradient(820px 600px at 108% -6%, var(--bg2) 0%, transparent 58%),
    radial-gradient(900px 700px at 52% 112%, var(--bg3) 0%, transparent 60%),
    radial-gradient(700px 520px at -10% 60%, var(--bg4) 0%, transparent 55%),
    linear-gradient(180deg,var(--glass2) 0%, transparent 100%);
  background-color:transparent;
  background-attachment:fixed;background-repeat:no-repeat;
  min-height:100vh;
  padding-bottom:env(safe-area-inset-bottom);
}
[data-theme="dark"] body{background-color:#0e1626}
a{color:var(--acc);text-decoration:none}
code{background:rgba(125,145,180,.16);border-radius:5px;padding:1px 5px;font-size:12.5px}
.dim{color:var(--dim)}
.small{font-size:12.5px}
.grow{flex:1}
.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}

/* ---------------- 顶栏 ---------------- */
#top{position:sticky;top:0;z-index:30;padding:8px 12px 0;
  background:var(--glass);
  -webkit-backdrop-filter:blur(22px) saturate(180%);backdrop-filter:blur(22px) saturate(180%);
  border-bottom:1px solid var(--line);box-shadow:0 6px 22px rgba(24,48,92,.06)}
.brand{font-weight:800;font-size:16px;letter-spacing:.4px;color:var(--fg)}
.badge{font-size:12px;color:var(--dim);border-radius:20px;padding:2px 10px;
  background:var(--card2);border:1px solid var(--line);white-space:nowrap}
#tabs{margin-top:8px;display:flex;gap:6px;overflow-x:auto;padding-bottom:8px;scrollbar-width:none}
#tabs::-webkit-scrollbar{display:none}
#tabs a{white-space:nowrap;font-size:13px;padding:6px 12px;border-radius:11px;
  color:var(--dim);background:var(--card2);border:1px solid var(--line)}
#tabs a.on{color:#fff;border-color:transparent;background:linear-gradient(180deg,var(--acc2),var(--acc));
  box-shadow:0 8px 20px rgba(47,107,255,.32)}

/* ---------------- 按钮 ---------------- */
button{font:inherit;color:var(--fg);cursor:pointer;font-size:13.5px;padding:8px 13px;
  border-radius:12px;border:1px solid var(--line);background:var(--btn);
  box-shadow:0 2px 8px rgba(24,48,92,.08);
  transition:transform .12s,box-shadow .18s,background .18s}
button:hover{box-shadow:0 6px 16px rgba(24,48,92,.14)}
button:active{transform:scale(.97)}
button.on{color:#fff;border-color:transparent;background:linear-gradient(180deg,var(--acc2),var(--acc));
  box-shadow:0 8px 20px rgba(47,107,255,.34)}
button.gh{background:var(--card2)}
button.icon{padding:6px 10px;font-size:15px;line-height:1}
button.danger{color:var(--bad);border-color:rgba(232,67,79,.35)}
button.primary{color:#fff;border-color:transparent;background:linear-gradient(180deg,var(--acc2),var(--acc));
  box-shadow:0 8px 20px rgba(47,107,255,.3);font-weight:600}
button:disabled{opacity:.45;cursor:default}
.link{background:none;border:0;box-shadow:none;padding:0;color:var(--acc);text-decoration:underline;font-size:inherit}

/* ---------------- 布局 ---------------- */
#stage{max-width:900px;margin:0 auto;padding:14px 12px 130px}
.card{background:var(--card);border-radius:var(--radius);padding:14px;margin-bottom:12px;
  border:1px solid rgba(255,255,255,.55);
  -webkit-backdrop-filter:blur(16px) saturate(170%);backdrop-filter:blur(16px) saturate(170%);
  box-shadow:var(--sh)}
[data-theme="dark"] .card{border-color:rgba(120,150,210,.14)}
h3{margin:6px 0 10px;font-size:15px;color:var(--warn);font-weight:700}
.loading{padding:60px 10px;text-align:center;color:var(--dim)}

/* 首页大按钮 */
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.tile{display:flex;flex-direction:column;gap:2px;align-items:flex-start;text-align:left;
  padding:14px;border-radius:14px;background:var(--card);border:1px solid var(--line);box-shadow:var(--sh2)}
.tile b{font-size:15px}
.tile span{font-size:12px;color:var(--dim)}
.tile.accent{background:linear-gradient(140deg,rgba(91,141,255,.18),rgba(47,107,255,.06));
  border-color:rgba(47,107,255,.3)}

/* 进度条 */
.pbar{height:8px;border-radius:6px;background:rgba(125,145,180,.2);overflow:hidden;margin-top:8px}
.pbar i{display:block;height:100%;width:0;border-radius:6px;
  background:linear-gradient(90deg,var(--acc2),var(--acc));transition:width .3s}
.pbar.ok i{background:linear-gradient(90deg,#3fd08a,var(--ok))}
.pbar.bad i{background:linear-gradient(90deg,#ff8b7a,var(--bad))}

/* 统计块 */
.stat{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--dim)}
.stat b{color:var(--fg);font-size:18px;display:block;line-height:1.3}
.big{font-size:34px;font-weight:800;letter-spacing:1px}

/* ---------------- 题目 ---------------- */
.meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:12.5px;color:var(--dim);margin-bottom:10px}
.meta .tag{border:1px solid var(--line);border-radius:20px;padding:1px 9px;background:var(--card2)}
.qtext{font-size:17px;line-height:1.7;font-weight:600;margin-bottom:14px;white-space:pre-wrap;word-break:break-word}
.opt{display:flex;gap:10px;align-items:flex-start;padding:11px 13px;margin:9px 0;border-radius:13px;
  border:1.5px solid var(--line);background:var(--card2);cursor:pointer;
  transition:border-color .15s,background .15s,transform .1s;font-size:15px;line-height:1.55}
.opt:hover{border-color:rgba(47,107,255,.45)}
.opt:active{transform:scale(.995)}
.opt .k{flex:0 0 24px;height:24px;border-radius:8px;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:12.5px;background:rgba(125,145,180,.18);color:var(--dim)}
.opt.sel{border-color:var(--acc);background:rgba(47,107,255,.10)}
.opt.sel .k{background:var(--acc);color:#fff}
.opt.right{border-color:rgba(18,164,95,.7);background:rgba(18,164,95,.12)}
.opt.right .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:rgba(232,67,79,.7);background:rgba(232,67,79,.10)}
.opt.wrong .k{background:var(--bad);color:#fff}
.opt.dim0{opacity:.55}

.res{margin-top:12px;padding:11px 13px;border-radius:12px;font-size:14px;line-height:1.7;font-weight:600}
.res.ok{color:#0d7d49;background:rgba(18,164,95,.12);border-left:3px solid var(--ok)}
.res.no{color:#b32b36;background:rgba(232,67,79,.11);border-left:3px solid var(--bad)}
.res.tip{color:var(--warn);background:rgba(201,121,12,.12);border-left:3px solid var(--warn);font-weight:500}
[data-theme="dark"] .res.ok{color:#5fe0a4}
[data-theme="dark"] .res.no{color:#ff8f9a}
.hint{margin-top:10px;padding:11px 13px;border-radius:12px;background:var(--card2);
  border:1px solid var(--line);font-size:13.5px;line-height:1.75;white-space:pre-wrap;color:var(--fg)}
.hint b{color:var(--warn);display:block;margin-bottom:4px}
.thumb{margin:12px 0;text-align:center;padding:10px;border-radius:12px;
  background:var(--card2);border:1px dashed var(--line)}
.thumb img{max-width:100%;border-radius:10px;cursor:zoom-in;box-shadow:0 4px 16px rgba(24,48,92,.14)}

/* ---------------- 底栏 ---------------- */
.bar{position:fixed;left:0;right:0;bottom:0;z-index:25;padding:9px 12px;
  padding-bottom:calc(9px + env(safe-area-inset-bottom));
  background:var(--glass);
  -webkit-backdrop-filter:blur(22px) saturate(180%);backdrop-filter:blur(22px) saturate(180%);
  border-top:1px solid var(--line);box-shadow:0 -6px 22px rgba(24,48,92,.07)}
.bar .inner{max-width:900px;margin:0 auto;display:flex;align-items:center;gap:8px}
.bar .grow{text-align:center;font-size:13px;color:var(--dim);min-width:0;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------------- 答题卡 ---------------- */
.grid-wrap{position:fixed;left:0;right:0;bottom:0;z-index:40;max-height:62vh;overflow:auto;
  padding:14px 12px calc(14px + env(safe-area-inset-bottom));
  background:var(--glass);border-top:1px solid var(--line);
  -webkit-backdrop-filter:blur(24px) saturate(180%);backdrop-filter:blur(24px) saturate(180%);
  box-shadow:0 -12px 40px rgba(24,48,92,.16);border-radius:18px 18px 0 0}
.grid-wrap .ghead{display:flex;align-items:center;gap:10px;margin-bottom:10px;font-size:13px;color:var(--dim)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:7px}
.grid b{display:flex;align-items:center;justify-content:center;height:36px;border-radius:10px;
  font-weight:500;font-size:13px;cursor:pointer;user-select:none;
  background:var(--card2);border:1px solid var(--line)}
.grid b.g{background:rgba(18,164,95,.16);border-color:rgba(18,164,95,.42)}
.grid b.r{background:rgba(232,67,79,.14);border-color:rgba(232,67,79,.42)}
.grid b.cur{outline:2px solid var(--acc);outline-offset:1px}

/* ---------------- 图片放大 ---------------- */
.zoom{display:none;position:fixed;inset:0;z-index:99;padding:14px;
  align-items:center;justify-content:center;background:var(--glass);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.zoom.on{display:flex}
.zoom img{max-width:100%;max-height:100%;border-radius:12px;box-shadow:0 14px 44px rgba(0,0,0,.35)}

/* ---------------- 设置面板 ---------------- */
.sheet{position:fixed;inset:0;z-index:80;display:flex;align-items:flex-end;justify-content:center}
.sheet-mask{position:absolute;inset:0;background:rgba(10,18,32,.42);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}
.sheet-body{position:relative;width:100%;max-width:640px;max-height:88vh;overflow:auto;
  background:var(--glass);border-radius:20px 20px 0 0;padding:16px 16px calc(20px + env(safe-area-inset-bottom));
  border-top:1px solid var(--line);box-shadow:0 -16px 50px rgba(10,20,40,.3);
  -webkit-backdrop-filter:blur(24px) saturate(180%);backdrop-filter:blur(24px) saturate(180%)}
.sheet-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;font-size:16px}
.grp{margin-bottom:18px}
.grp-t{font-size:12.5px;color:var(--warn);font-weight:700;margin-bottom:8px;letter-spacing:.4px}
.kv{display:flex;justify-content:space-between;font-size:13px;padding:5px 0;border-bottom:1px dashed var(--line)}
.kv b{font-weight:600}
.drop{border:1.5px dashed var(--line);border-radius:14px;padding:16px;text-align:center;
  font-size:13.5px;background:var(--card2);transition:border-color .15s,background .15s}
.drop.over{border-color:var(--acc);background:rgba(47,107,255,.10)}
.drop .dim{margin-top:6px;font-size:12px}

/* 开关 */
.sw{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:9px 0;font-size:14px;cursor:pointer;border-bottom:1px dashed var(--line)}
.sw input{display:none}
.sw i{flex:0 0 42px;height:24px;border-radius:20px;background:rgba(125,145,180,.32);
  position:relative;transition:background .18s}
.sw i::after{content:'';position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;
  background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.25);transition:transform .18s}
.sw input:checked + i{background:var(--acc)}
.sw input:checked + i::after{transform:translateX(18px)}

/* 技巧手册折叠 */
.acc{margin-bottom:8px;border-radius:13px;overflow:hidden;background:var(--card2);border:1px solid var(--line)}
.acc>.h{padding:11px 13px;cursor:pointer;font-weight:600;display:flex;justify-content:space-between;gap:10px;font-size:14px}
.acc>.b{display:none;padding:0 13px 13px;color:var(--dim);font-size:13.5px;white-space:pre-wrap;line-height:1.75}
.acc.open>.b{display:block}

/* 列表项 */
.li{display:flex;gap:10px;align-items:center;justify-content:space-between;
  padding:11px 13px;margin-bottom:8px;border-radius:12px;background:var(--card2);
  border:1px solid var(--line);font-size:14px}
.li .n{font-weight:700;font-size:14px}

/* 空状态 */
.empty{padding:40px 12px;text-align:center;color:var(--dim)}
.empty b{display:block;font-size:16px;color:var(--fg);margin-bottom:6px}

/* 搜索框 */
input[type=search],input[type=text]{width:100%;font:inherit;font-size:14px;padding:9px 12px;
  border-radius:12px;border:1px solid var(--line);background:var(--card2);color:var(--fg);outline:none}
input[type=search]:focus,input[type=text]:focus{border-color:var(--acc)}

@media (max-width:520px){
  .hide-sm{display:none!important}
  .qtext{font-size:16px}
  .grid3{grid-template-columns:repeat(2,1fr)}
  #stage{padding:12px 10px 120px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}