/* ============================================================
   市场序列大带宽 · 刷题系统  —  视觉样式
   ============================================================ */
:root{
  --bg:#f4f6fb;
  --card:#ffffff;
  --ink:#131a2b;
  --ink-2:#3d4761;
  --sub:#6b7690;
  --line:#e6eaf2;
  --line-2:#eef1f7;

  --brand:#2f6bff;
  --brand-2:#6b5bff;
  --brand-ink:#1b48c4;
  --brand-weak:#eef3ff;

  --ok:#12a150; --ok-weak:#e9f9ef;
  --no:#e5484d; --no-weak:#fdeeee;
  --warn:#d97706; --warn-weak:#fff5e6;

  --r-sm:10px; --r:14px; --r-lg:18px; --r-xl:24px;
  --sh-1:0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);
  --sh-2:0 4px 16px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.04);
  --sh-3:0 12px 32px rgba(16,24,40,.10);
  --maxw:780px; --pad:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;padding:0}
body{
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(900px 420px at 8% -10%, rgba(47,107,255,.10), transparent 62%),
    radial-gradient(760px 400px at 105% -6%, rgba(107,91,255,.10), transparent 60%),
    var(--bg);
  background-attachment:fixed;
  min-height:100vh; padding-bottom:72px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
.hidden{display:none!important}
.sprite{position:absolute;width:0;height:0;overflow:hidden}

/* 图标 */
.ic{width:20px;height:20px;flex:0 0 auto;
  fill:none;stroke:currentColor;stroke-width:1.7;
  stroke-linecap:round;stroke-linejoin:round}
.ic.sm{width:16px;height:16px}

/* ===== 顶栏 ===== */
.top{position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid rgba(230,234,242,.9);
  display:flex;align-items:center;gap:12px;padding:9px 16px;min-height:56px}
.brand{display:flex;align-items:center;gap:10px;min-width:0;flex:1}
.logo{width:34px;height:34px;border-radius:11px;flex:0 0 auto;
  display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 4px 12px rgba(47,107,255,.28)}
.logo .ic{stroke-width:2.2;width:19px;height:19px}
.logo.lg{width:56px;height:56px;border-radius:17px}
.logo.lg .ic{width:30px;height:30px}
.titles{min-width:0}
.top h1{font-size:16px;margin:0;font-weight:650;letter-spacing:-.01em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top .sub{display:block;font-size:11px;color:var(--sub);letter-spacing:.06em;margin-top:-1px}
.who{font-size:12.5px;color:var(--sub);white-space:nowrap;max-width:34vw;
  overflow:hidden;text-overflow:ellipsis}
.top button{font-size:12.5px;padding:6px 12px;min-height:32px;border-radius:9px}

/* 顶栏导航（桌面） */
.topnav{display:none;gap:2px;margin-right:6px}
.topnav a{display:flex;align-items:center;gap:6px;padding:8px 13px;border-radius:10px;
  color:var(--sub);font-size:13.5px;font-weight:500;transition:.16s var(--ease)}
.topnav a .ic{width:17px;height:17px}
.topnav a:hover{background:#f2f5fb;color:var(--ink)}
.topnav a.on{background:var(--brand-weak);color:var(--brand);font-weight:600}

/* ===== 布局 ===== */
.wrap{max-width:var(--maxw);margin:0 auto;padding:var(--pad)}
.view{animation:viewIn .26s var(--ease)}
@keyframes viewIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

.card{background:var(--card);border-radius:var(--r-lg);border:1px solid var(--line-2);
  box-shadow:var(--sh-2);padding:16px;margin-bottom:12px}
.card.slim{padding:12px 16px}
.card h2{font-size:15px;margin:0 0 12px;font-weight:650;letter-spacing:-.01em;
  display:flex;align-items:center;gap:8px}
.muted{color:var(--sub);font-size:13px}
.hint{color:var(--sub);font-size:12.5px;margin:10px 0 0;line-height:1.6}

/* ===== 按钮 ===== */
button,.btn{font:inherit;border:1px solid var(--line);background:#fff;color:var(--ink);
  padding:10px 16px;border-radius:11px;cursor:pointer;min-height:40px;
  transition:.16s var(--ease);font-weight:500}
button:hover{border-color:#cfd8e8;background:#fbfcfe}
button:active{transform:scale(.985)}
button:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-p{background:linear-gradient(135deg,var(--brand),#4f63ff);border-color:transparent;color:#fff;
  font-weight:600;box-shadow:0 6px 16px rgba(47,107,255,.26)}
.btn-p:hover{background:linear-gradient(135deg,#2a61ef,#4657f0);box-shadow:0 8px 20px rgba(47,107,255,.32)}
.btn-sm{padding:5px 11px;font-size:13px;border-radius:9px;min-height:32px}
.btn-ghost{background:transparent;border-color:transparent;color:var(--sub)}
.btn-ghost:hover{background:#f2f5fb;color:var(--ink)}
.btn-block{display:block;width:100%;margin-top:10px}

/* ===== 表单 ===== */
input[type=text],input[type=password],input[type=number],select{
  font:inherit;width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:12px;
  background:#fff;outline:none;min-height:46px;color:var(--ink);transition:.16s var(--ease)}
input::placeholder{color:#a5aec3}
input:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(47,107,255,.12)}
label.field{display:block;margin-bottom:12px}
label.field>span{display:block;font-size:12.5px;color:var(--sub);margin-bottom:6px;font-weight:500}
.input-wrap{position:relative}
.input-wrap>.ic{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:#9aa5bd;width:18px;height:18px}
.input-wrap input{padding-left:40px}
.fillbox{display:flex;gap:8px}
.fillbox input{flex:1}
.btn-ghost-code{white-space:nowrap;border-radius:12px;font-size:13.5px;color:var(--brand);
  border-color:#d7e2ff;background:#f5f8ff;font-weight:600;padding:0 14px}
.btn-ghost-code:hover{background:#eaf1ff;border-color:#c3d5ff}

/* ===== 启动占位 ===== */
#view-boot{padding-top:64px}
.bootbox{text-align:center;color:var(--sub)}
.bootbox .logo{margin:0 auto 14px;animation:bootPulse 1.5s var(--ease) infinite}
.bootbox p{margin:0;font-size:13px;letter-spacing:.04em}
@keyframes bootPulse{0%,100%{transform:scale(1);opacity:.85}50%{transform:scale(1.06);opacity:1}}

/* ===== 登录 ===== */
#view-login{padding-top:28px}
.login-hero{text-align:center;margin:0 0 18px}
.login-hero .logo{margin:0 auto 12px}
.login-hero h2{margin:0;font-size:19px;font-weight:700;letter-spacing:-.015em}
.login-hero p{margin:6px 0 0;color:var(--sub);font-size:13px;letter-spacing:.04em}
.namebox{margin-top:16px;padding-top:16px;border-top:1px dashed var(--line)}
.adminlink{margin:12px 0 0}
.adminlink a{font-size:12.5px;color:#9aa5bd}
.adminlink a:hover{color:var(--brand)}

/* ===== 首页 hero ===== */
.hero{position:relative;overflow:hidden;border-radius:var(--r-xl);padding:20px;
  background:linear-gradient(135deg,#2f6bff 0%,#4f5cff 46%,#7a5cff 100%);
  color:#fff;box-shadow:0 14px 34px rgba(47,107,255,.28);margin-bottom:14px;
  display:flex;align-items:center;gap:16px}
.hero:before{content:"";position:absolute;inset:0;
  background:radial-gradient(220px 160px at 88% 8%, rgba(255,255,255,.22), transparent 70%),
             radial-gradient(180px 140px at 6% 100%, rgba(255,255,255,.14), transparent 70%);
  pointer-events:none}
.hero-main{flex:1;min-width:0;position:relative}
.hero-hi{margin:0;font-size:15px;opacity:.92}
.hero-hi b{font-weight:700}
.hero-sub{margin:2px 0 14px;font-size:12.5px;opacity:.78}
.hero-stats{display:flex;gap:18px}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.15}
.hero-stats span{font-size:11.5px;opacity:.8;margin-top:1px}
.hero-progress{position:relative;width:86px;height:86px;flex:0 0 auto}
.hero-progress svg{transform:rotate(-90deg)}
.hero-progress .ring-bg{stroke:rgba(255,255,255,.24)}
.hero-progress .ring-fg{stroke:#fff;stroke-linecap:round;transition:stroke-dashoffset .8s var(--ease)}
.hero-progress .pc{position:absolute;inset:0;display:grid;place-items:center;
  font-size:19px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.hero-progress .pc span{display:inline-block;line-height:1}
.hero-progress .pc i{font-style:normal;font-size:10px;font-weight:600;opacity:.85;margin-left:1px}

/* ===== 模式卡片 ===== */
.modes{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}
.mode{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line-2);
  border-radius:var(--r);padding:13px;box-shadow:var(--sh-1);cursor:pointer;
  transition:.18s var(--ease);position:relative;overflow:hidden}
.mode:hover{transform:translateY(-2px);box-shadow:var(--sh-3);border-color:#dbe4ff}
.mode .mi{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;flex:0 0 auto}
.mode .mi .ic{width:21px;height:21px;stroke-width:1.9}
.mi-blue{background:var(--brand-weak);color:var(--brand)}
.mi-indigo{background:#f0eeff;color:#6b5bff}
.mi-amber{background:#fff5e6;color:#d97706}
.mi-rose{background:#fdeeee;color:#e5484d}
.mi-teal{background:#e6f8f4;color:#0d9488}
.mode .mtxt{min-width:0;flex:1}
.mode b{display:block;font-size:14.5px;font-weight:650;letter-spacing:-.01em}
.mode small{color:var(--sub);font-size:12px;display:-webkit-box;margin-top:1px;
  -webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.45}
.mode .chev{color:#c3cbdd;width:18px;height:18px;transition:.18s var(--ease)}
.mode:hover .chev{color:var(--brand);transform:translateX(2px)}

/* ===== 提示列表 ===== */
.tips ul{list-style:none;margin:0;padding:0}
.tips li{display:flex;gap:9px;align-items:flex-start;color:var(--sub);font-size:12.8px;
  padding:7px 0;line-height:1.55}
.tips li .ic{width:16px;height:16px;margin-top:2px;color:#9aa5bd}

/* ===== 章节 ===== */
.sec{border:1px solid var(--line-2);border-radius:var(--r);margin-bottom:9px;
  overflow:hidden;background:#fff;box-shadow:var(--sh-1);transition:.18s var(--ease)}
.sec:hover{border-color:#dbe4ff}
.sec .hd{display:flex;align-items:center;gap:10px;padding:12px 14px;cursor:pointer}
.sec .hd b{flex:1;font-size:13.8px;font-weight:600;letter-spacing:-.01em}
.sec .hd .n{font-size:12px;color:var(--sub);font-variant-numeric:tabular-nums}
.sec .hd .chev{width:16px;height:16px;color:#b9c2d6;transition:.2s var(--ease)}
.sec.open .hd .chev{transform:rotate(90deg);color:var(--brand)}
.sec .bd{display:none;border-top:1px solid var(--line-2);background:#fcfdff}
.sec.open .bd{display:block}
.jie{display:flex;align-items:center;gap:12px;padding:11px 14px;border-top:1px solid #f3f5fa}
.jie:first-child{border-top:none}
.jie .t{flex:1;min-width:0;font-size:13.6px}
.jie .t i{font-style:normal;color:var(--sub);font-size:11.5px;display:block;margin-top:2px;
  font-variant-numeric:tabular-nums}
.jie .bar{width:64px;height:5px;border-radius:4px;background:#edf1f8;overflow:hidden;flex:0 0 auto}
.jie .bar i{display:block;height:100%;border-radius:4px;
  background:linear-gradient(90deg,var(--brand),#5b78ff)}
.jie button{flex:0 0 auto}

/* 考试目标标签 / 占比徽章 */
.wchip{display:inline-block;font-size:11.5px;font-weight:600;padding:2px 9px;border-radius:20px;
  background:rgba(255,255,255,.22);color:#fff;margin-left:6px;vertical-align:1px;
  border:1px solid rgba(255,255,255,.3)}
.wbadge{display:inline-block;font-size:11px;font-weight:700;padding:1px 7px;border-radius:7px;
  background:var(--brand-weak);color:var(--brand);margin:0 2px;font-variant-numeric:tabular-nums}
.wbadge.off{background:#f1f3f8;color:#98a2b8}
.dianrow.dim{opacity:.55}
.dianrow.dim:hover{opacity:.85}

/* 节块（章内） */
.jieblock{border-top:1px solid #f3f5fa}
.jieblock:first-child{border-top:none}
.jiehd{display:flex;align-items:center;gap:10px;padding:12px 14px 8px}
.jiehd .jt{flex:1;min-width:0}
.jiehd .jt b{display:block;font-size:13.6px;font-weight:600}
.jiehd .jt i{font-style:normal;color:var(--sub);font-size:11.5px;display:block;margin-top:2px;
  font-variant-numeric:tabular-nums}
.jiehd .bar{width:56px}
.jiehd button{flex:0 0 auto;font-size:12px;padding:4px 10px;min-height:28px;border-radius:8px}

/* 考点列表 */
.dianlist{padding:0 14px 12px}
.dianrow{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;
  background:#f8fafd;border:1px solid #eef2f8;margin-bottom:6px;transition:.15s var(--ease)}
.dianrow:hover{background:#fff;border-color:#d9e3fb;box-shadow:0 2px 8px rgba(47,107,255,.07)}
.dianrow:last-child{margin-bottom:0}
.dianrow .dt{flex:1;min-width:0;font-size:13px;color:var(--ink-2);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dianrow .dn{font-size:11.5px;color:var(--sub);white-space:nowrap;font-variant-numeric:tabular-nums}
.dianrow button{flex:0 0 auto;min-height:28px;padding:4px 12px;border-radius:8px;font-size:12px}

/* 邮箱固定后缀 */
.emailwrap{position:relative;display:flex;align-items:center}
.emailwrap input{padding-right:132px}
.emailwrap .domfix{position:absolute;right:14px;font-size:13px;color:var(--sub);
  pointer-events:none;white-space:nowrap;user-select:none}

/* 多选题：与单选区分的视觉语言 */
.tag.multi{background:#f3f0ff;color:#6b5bff}
.qhint{margin:-6px 0 14px;font-size:12.5px;color:#6b5bff;background:#f7f5ff;
  border:1px dashed #d8d0ff;border-radius:10px;padding:7px 11px}
.qhint b{font-weight:700}

.opt.multi .k{border-radius:7px;background:#f4f2ff;color:#6b5bff}
.opt.multi .tick{flex:0 0 20px;text-align:center;color:#fff;font-size:13px;font-weight:700;
  opacity:0;transform:scale(.6);transition:.15s var(--ease)}
.opt.multi.sel{border-color:#6b5bff;background:#f7f5ff;box-shadow:0 3px 12px rgba(107,91,255,.14)}
.opt.multi.sel .k{background:#6b5bff;color:#fff}
.opt.multi.sel .tick{opacity:1;transform:scale(1);color:#6b5bff}
.opt.multi.right{border-color:var(--ok);background:var(--ok-weak)}
.opt.multi.right .k{background:var(--ok);color:#fff}
.opt.multi.right .tick{opacity:0}
.opt.multi.wrong{border-color:var(--no);background:var(--no-weak)}
.opt.multi.wrong .k{background:var(--no);color:#fff}
.opt.multi.wrong .tick{opacity:0}

/* ===== 答题 ===== */
.qhead{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:2px 0 12px}
.qhead .prog{font-size:13px;font-weight:700;color:var(--ink-2);font-variant-numeric:tabular-nums;
  background:#fff;border:1px solid var(--line-2);border-radius:9px;padding:4px 10px;box-shadow:var(--sh-1)}
.tag{font-size:11px;padding:3px 9px;border-radius:20px;background:var(--brand-weak);color:var(--brand);
  font-weight:600;letter-spacing:.02em}
.tag.gz{background:var(--warn-weak);color:var(--warn)}
.qjie{font-size:11.5px;color:var(--sub);margin-left:auto;text-align:right;
  max-width:60%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.qcard{padding:18px}
.stem{font-size:16.5px;line-height:1.78;margin:2px 0 18px;white-space:pre-wrap;word-break:break-word;
  letter-spacing:.005em;font-weight:500}
.opt{display:flex;gap:11px;align-items:flex-start;border:1.5px solid var(--line);border-radius:13px;
  padding:12px 13px;margin-bottom:10px;cursor:pointer;background:#fff;min-height:50px;
  transition:.16s var(--ease)}
.opt:hover{border-color:#c9d6f5;background:#fbfcff;box-shadow:0 2px 8px rgba(47,107,255,.06)}
.opt .k{flex:0 0 26px;height:26px;border-radius:9px;background:#f3f6fc;color:#5b6780;
  display:grid;place-items:center;font-weight:700;font-size:13px;margin-top:1px;
  transition:.16s var(--ease)}
.opt .v{flex:1;font-size:14.6px;line-height:1.65;word-break:break-word;padding-top:1px}
.opt.sel{border-color:var(--brand);background:var(--brand-weak);box-shadow:0 3px 12px rgba(47,107,255,.14)}
.opt.sel .k{background:var(--brand);color:#fff;transform:scale(1.04)}
.opt.right{border-color:var(--ok);background:var(--ok-weak)}
.opt.right .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--no);background:var(--no-weak)}
.opt.wrong .k{background:var(--no);color:#fff}
.opt.dis{cursor:default;box-shadow:none}
.opt.dis:hover{transform:none}

.fb{margin-top:16px;border-radius:14px;padding:14px;font-size:13.8px;
  animation:fbIn .24s var(--ease)}
@keyframes fbIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.fb.ok{background:var(--ok-weak);border:1px solid #c9f0d8}
.fb.no{background:var(--no-weak);border:1px solid #f8d3d4}
.fb .h{font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:7px;font-size:14.5px}
.fb .h .ic{width:18px;height:18px;stroke-width:2.4}
.fb .h.ok{color:var(--ok)} .fb .h.no{color:var(--no)}
.fb .row{margin:5px 0;word-break:break-word;line-height:1.65}
.fb .k{color:var(--sub);font-size:12.5px}
.fb .row b{font-weight:650}
.fb .src .k{display:block;font-size:11.5px;letter-spacing:.05em;color:#8b96ad;margin-bottom:4px}
.fb .src{background:#fff;border-radius:10px;padding:10px 12px;margin-top:9px;font-size:12.8px;
  color:var(--ink-2);border-left:3px solid #b9cdfb;max-height:300px;overflow:auto;line-height:1.75;
  white-space:pre-wrap}
.fb .ctxp{margin:6px 0;line-height:1.75;color:var(--sub);font-size:12.8px}
.fb .ctxp:first-of-type{margin-top:4px}
.fb .ctxp.hit{color:var(--ink);background:#f2f7ff;border-left:3px solid var(--brand);
  border-radius:0 8px 8px 0;padding:6px 10px;margin:8px -2px 8px -6px}
.fb .acts{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap;justify-content:flex-end}
.fb .acts button{flex:0 1 auto;min-width:98px;min-height:38px;font-size:13.5px}

.fillbox input{min-height:46px}
.pnav{margin:2px 0 0;display:flex}
.pnav button{display:flex;align-items:center;gap:6px}
.kbhint{display:none;text-align:center;margin:10px 0 0;color:#9aa5bd;font-size:12px}
.kbhint b{color:var(--ink-2)}

/* ===== 报错与反馈 ===== */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:6px 12px;border-radius:20px;border:1px solid var(--line);background:#fff;
  font-size:12.5px;color:var(--sub);cursor:pointer;transition:.15s var(--ease)}
.chip:hover{border-color:#c9d6f5}
.chip.on{background:var(--brand-weak);border-color:var(--brand);color:var(--brand);font-weight:600}

.repcard .reptop{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.repstem{font-size:14.5px;line-height:1.7;margin-bottom:8px}
.repans{font-size:13px;color:var(--sub);margin-bottom:6px}
.repcard .rn{font-size:13px;color:var(--ink-2);background:#f8fafd;border-left:3px solid #ffd08a;
  border-radius:0 8px 8px 0;padding:6px 10px;margin:6px 0}
.repedit{margin-top:10px;padding-top:10px;border-top:1px dashed var(--line);font-size:13px;color:var(--sub)}
.optpick{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.pick{padding:7px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;
  font-size:13px;cursor:pointer;text-align:left;max-width:100%}
.pick.on{background:var(--ok-weak);border-color:var(--ok);color:#0f7a3d;font-weight:600}
.fillans{width:100%;margin:8px 0}
.dianpick{max-width:100%;margin:8px 0;min-height:38px;font-size:13px}

/* ===== KPI ===== */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-bottom:0}
.kpi{background:#fff;border:1px solid var(--line-2);border-radius:var(--r);padding:14px 8px;
  text-align:center;box-shadow:var(--sh-1)}
.kpi b{display:block;font-size:20px;line-height:1.2;font-weight:700;
  font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.kpi small{color:var(--sub);font-size:11.5px;display:block;margin-top:2px}

/* ===== 表格 ===== */
table.list{width:100%;border-collapse:collapse;font-size:13px}
table.list th,table.list td{padding:9px 6px;border-bottom:1px solid var(--line-2);text-align:left;
  vertical-align:top}
table.list th{color:var(--sub);font-weight:500;font-size:11.5px;letter-spacing:.02em}
table.list tr:last-child td{border-bottom:none}
table.list td.n{text-align:right;color:var(--sub);font-variant-numeric:tabular-nums;white-space:nowrap}
.pill{font-size:11px;padding:2px 8px;border-radius:20px;background:var(--brand-weak);color:var(--brand);
  font-weight:600}

/* ===== 底部导航 ===== */
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;
  background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);
  border-top:1px solid rgba(230,234,242,.9);padding-bottom:env(safe-area-inset-bottom)}
.tabbar a{flex:1;text-align:center;padding:7px 0 6px;color:#95a0b8;font-size:10.5px;
  display:flex;flex-direction:column;align-items:center;gap:2px;transition:.16s var(--ease)}
.tabbar a i{display:block;width:38px;height:26px;border-radius:9px;display:grid;place-items:center;
  transition:.18s var(--ease);font-style:normal}
.tabbar a .ic{width:20px;height:20px}
.tabbar a.on{color:var(--brand);font-weight:600}
.tabbar a.on i{background:var(--brand-weak)}

/* ===== 提示条 ===== */
.toast{position:fixed;left:50%;bottom:88px;transform:translate(-50%,8px);
  background:rgba(19,26,43,.94);color:#fff;padding:10px 18px;border-radius:22px;font-size:13px;
  z-index:99;opacity:0;pointer-events:none;transition:.28s var(--ease);max-width:82vw;text-align:center;
  box-shadow:0 10px 26px rgba(16,24,40,.24)}
.toast.show{opacity:1;transform:translate(-50%,0)}

.empty{text-align:center;color:var(--sub);padding:40px 10px;font-size:14px}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width:640px){
  :root{--pad:18px}
  body{font-size:15.5px}
  .modes{grid-template-columns:repeat(3,1fr)}
  .stem{font-size:17px}
  .hero{padding:24px}
}

@media (min-width:960px){
  :root{--maxw:1100px;--pad:22px}
  body{padding-bottom:28px}
  .tabbar{display:none}
  .topnav{display:flex}
  .top{padding:10px 26px;min-height:62px}
  .brand{flex:0 0 auto}
  .top h1{font-size:17px}
  .who{max-width:none}
  .wrap{padding:22px 26px 42px}

  #view-login{max-width:480px;margin-top:40px}
  #view-target{max-width:560px;margin-top:30px}
  .modes{grid-template-columns:repeat(5,1fr);gap:12px}
  .mode{flex-direction:column;align-items:flex-start;gap:10px;padding:16px}
  .mode .chev{position:absolute;right:12px;top:14px}

  .home-bottom{display:grid;grid-template-columns:1.35fr 1fr;gap:14px;align-items:start}
  #secList .card{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-items:start}
  #secList .card>h2{grid-column:1/-1;margin:0 0 4px}
  #secList .sec{margin-bottom:0}
  .sec.open{grid-column:1/-1}

  #view-practice{max-width:880px}
  .kbhint{display:block}
  .qcard{padding:22px}
  .stem{font-size:17px;line-height:1.8}
  .kpi b{font-size:24px}
}

@media (min-width:1600px){
  :root{--maxw:1300px}
  #secList .card{grid-template-columns:1fr 1fr 1fr}
}

/* 手机 */
@media (max-width:639px){
  .modes .mode:last-child{grid-column:1/-1}
  .login-hero{margin-top:10px}
}

@media (max-width:380px){
  .modes{grid-template-columns:1fr}
  .modes .mode:last-child{grid-column:auto}
  .kpis{grid-template-columns:repeat(2,1fr)}
  .stem{font-size:15.8px}
  .hero-stats{gap:14px}
  .hero-stats b{font-size:18px}
}

@media (hover:none){
  .kbhint{display:none!important}
}

/* 可访问性：键盘焦点 */
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}