:root{
  --blue:#1a2b4a;          /* 深海军蓝（工具栏） */
  --blue-d:#132037;
  --blue-l:#eaf0fa;
  --accent:#2f5496;        /* 中伦蓝（强调/按钮） */
  --green:#2e9e5b;
  --green-l:#e7f6ec;
  --red:#d6453d;
  --red-l:#fbeaea;
  --ink:#1f2733;
  --muted:#7a8699;
  --line:#e4e8ef;
  --bg:#f3f5f9;
  --card:#ffffff;
  --radius:14px;
  --shadow:0 2px 10px rgba(31,39,51,.06);
  --base-font:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;height:100%;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:var(--base-font);line-height:1.55;
  overscroll-behavior:none;
  overflow:hidden;
}
.screen{display:none;height:100vh;height:100dvh;flex-direction:column;}
.screen.active{display:flex;}

/* ---------- app bar (home) ---------- */
.app-bar{flex:none;background:var(--blue);color:#fff;padding:calc(env(safe-area-inset-top) + 18px) 18px 18px;}
.app-bar-title{font-size:22px;font-weight:700;letter-spacing:.3px;}
.app-bar-sub{font-size:13px;opacity:.8;margin-top:2px;}

/* ---------- container (scrollable body) ---------- */
.container{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;max-width:760px;width:100%;margin:0 auto;padding:18px 16px calc(env(safe-area-inset-bottom) + 24px);}

/* ---------- home launch ---------- */
.home-container{display:flex;flex-direction:column;gap:14px;justify-content:center;padding-top:8px;padding-bottom:40px;}
.home-action{display:flex;align-items:center;gap:14px;width:100%;padding:18px 16px;border:none;border-radius:16px;background:var(--card);box-shadow:var(--shadow);cursor:pointer;text-align:left;position:relative;}
.home-action.primary{background:var(--accent);color:#fff;}
.home-action .ha-icon{font-size:24px;width:34px;text-align:center;}
.home-action .ha-text{display:flex;flex-direction:column;}
.home-action .ha-text b{font-size:17px;}
.home-action .ha-text small{font-size:12px;opacity:.7;}
.home-action .ha-badge{margin-left:auto;background:var(--line);color:var(--muted);font-size:13px;font-weight:700;padding:3px 10px;border-radius:999px;}
.home-action.primary .ha-badge{background:rgba(255,255,255,.22);color:#fff;}
.home-foot{text-align:center;font-size:12px;color:var(--muted);margin-top:8px;}

/* ---------- card ---------- */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:14px;}
.card-title{font-weight:700;font-size:15px;margin-bottom:12px;color:var(--blue);}

/* ---------- wizard ---------- */
.wiz-bar{flex:none;display:flex;align-items:center;background:var(--blue);color:#fff;padding:calc(env(safe-area-inset-top) + 12px) 14px 12px;gap:10px;}
.wiz-back{background:transparent;border:none;color:#fff;font-size:15px;cursor:pointer;padding:6px 4px;}
.wiz-title{flex:1;text-align:center;font-size:16px;font-weight:700;}
.wiz-next{background:transparent;border:1.5px solid rgba(255,255,255,.5);color:#fff;font-size:14px;font-weight:600;padding:7px 16px;border-radius:999px;cursor:pointer;}
.wiz-next:disabled{opacity:.4;}
.wiz-progress{flex:none;display:flex;gap:6px;justify-content:center;padding:10px;background:var(--blue);}
.wiz-dot{width:30px;height:5px;border-radius:999px;background:rgba(255,255,255,.3);}
.wiz-dot.active{background:#fff;}
.wiz-container{padding-top:20px;}
.wiz-h{font-size:18px;font-weight:700;margin-bottom:14px;color:var(--ink);}
.wiz-step[hidden]{display:none;}
.hint{font-size:13px;color:var(--muted);margin-top:10px;min-height:18px;}

/* subject list (wizard step1) */
.subj-list{display:flex;flex-direction:column;gap:10px;}
.subj-item{display:flex;align-items:center;gap:12px;padding:14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;}
.subj-item.active{border-color:var(--accent);background:var(--blue-l);}
.subj-badge{flex:none;width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;}
.subj-name{flex:1;font-size:15.5px;font-weight:600;}
.subj-check{flex:none;width:22px;height:22px;border-radius:50%;border:2px solid var(--line);display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;}
.subj-item.active .subj-check{background:var(--accent);border-color:var(--accent);}

/* mode cards (wizard step2) */
.mode-row{display:flex;gap:10px;}
.mode-card{flex:1;padding:14px 12px;border:1.5px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;text-align:left;}
.mode-card b{display:block;font-size:15px;}
.mode-card small{font-size:12px;color:var(--muted);}
.mode-card.active{border-color:var(--accent);background:var(--blue-l);}
.src-list{display:flex;flex-direction:column;gap:10px;}
.src-item{display:flex;align-items:center;gap:12px;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;}
.src-item.active{border-color:var(--accent);background:var(--blue-l);}
.src-item .src-name{flex:1;font-size:15px;font-weight:600;}
.src-item .src-count{font-size:13px;color:var(--muted);}
.src-item .src-radio{flex:none;width:20px;height:20px;border-radius:50%;border:2px solid var(--line);}
.src-item.active .src-radio{background:var(--accent);border-color:var(--accent);}

/* count step */
.count-show{text-align:center;font-size:34px;font-weight:800;color:var(--accent);margin:10px 0 16px;}
.count-show span{font-variant-numeric:tabular-nums;}
#countRange{width:100%;accent-color:var(--accent);}
.count-custom{display:flex;align-items:center;gap:10px;margin-top:14px;}
.count-custom label{font-size:14px;color:var(--muted);}
.count-custom input{width:90px;padding:9px 10px;border:1.5px solid var(--line);border-radius:10px;font-size:15px;}

/* ---------- exam bar (UWorld navy toolbar) ---------- */
.exam-bar{flex:none;display:flex;align-items:center;gap:8px;background:var(--blue);color:#fff;padding:calc(env(safe-area-inset-top) + 9px) 12px 9px;}
.exam-bar.plain{justify-content:space-between;}
.tb-icon{background:transparent;border:none;color:#fff;font-size:19px;cursor:pointer;padding:5px 7px;line-height:1;position:relative;opacity:.92;}
.tb-icon:active{opacity:.6;}
.tb-badge{position:absolute;top:-2px;right:-2px;background:var(--red);color:#fff;font-size:10px;font-weight:700;min-width:15px;height:15px;border-radius:999px;display:flex;align-items:center;justify-content:center;padding:0 3px;}
.exam-progress{font-size:14px;font-weight:600;margin:0 2px;}
.timer{margin-left:auto;font-variant-numeric:tabular-nums;font-weight:700;background:rgba(255,255,255,.18);padding:5px 12px;border-radius:999px;font-size:15px;}
.timer.hidden{display:none;}

/* ---------- exam content ---------- */
.exam-container{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;max-width:760px;width:100%;margin:0 auto;padding:18px 16px 24px;}
.q-meta{font-size:13px;color:var(--muted);margin-bottom:10px;}
.q-stem{font-size:17px;line-height:1.7;white-space:pre-wrap;margin-bottom:20px;}

/* ---------- options ---------- */
.options{display:flex;flex-direction:column;gap:12px;}
.opt{display:flex;align-items:flex-start;gap:12px;padding:14px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;transition:.12s;}
.opt:active{transform:scale(.99);}
.opt .badge{flex:none;width:28px;height:28px;border-radius:50%;border:1.5px solid var(--line);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--muted);font-size:14px;}
.opt .txt{flex:1;font-size:15.5px;line-height:1.55;}
.opt.selected{border-color:var(--accent);background:var(--blue-l);}
.opt.selected .badge{background:var(--accent);border-color:var(--accent);color:#fff;}
.opt.correct{border-color:var(--green);background:var(--green-l);}
.opt.correct .badge{background:var(--green);border-color:var(--green);color:#fff;}
.opt.wrong{border-color:var(--red);background:var(--red-l);}
.opt.wrong .badge{background:var(--red);border-color:var(--red);color:#fff;}
.opt.dim{opacity:.55;}
.opt.locked{cursor:default;}

/* explanation */
.explain{margin-top:18px;padding:14px 16px;background:var(--blue-l);border-left:4px solid var(--accent);border-radius:8px;font-size:14.5px;line-height:1.7;white-space:pre-wrap;}
.explain .ex-label{display:block;font-weight:700;color:var(--accent);margin-bottom:8px;font-size:13px;}

/* ---------- exam nav (bottom icon bar) ---------- */
.exam-nav{flex:none;display:flex;gap:8px;justify-content:space-between;padding:10px 20px calc(env(safe-area-inset-bottom) + 12px);background:var(--blue);max-width:760px;margin:0 auto;width:100%;}
.exam-nav .tb-icon{font-size:20px;padding:8px 14px;}
.nav-next{color:#fff;}
.nav-stop{color:#ff9a8f;}

/* ---------- results ---------- */
.result-score{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 16px;text-align:center;margin-bottom:14px;}
.score-num{font-size:40px;font-weight:800;color:var(--accent);}
.score-pct{font-size:18px;color:var(--muted);margin-top:4px;}
.stat-row{display:flex;gap:10px;margin-bottom:14px;}
.stat{flex:1;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 8px;text-align:center;}
.stat-val{font-size:22px;font-weight:800;}
.stat-lbl{font-size:12px;color:var(--muted);margin-top:4px;}
.breakdown{display:flex;flex-direction:column;gap:9px;}
.bd-row{display:flex;align-items:center;gap:10px;font-size:14px;}
.bd-name{flex:none;width:140px;color:var(--ink);}
.bd-track{flex:1;height:9px;background:var(--line);border-radius:999px;overflow:hidden;}
.bd-fill{height:100%;background:var(--accent);border-radius:999px;}
.bd-pct{flex:none;width:52px;text-align:right;color:var(--muted);font-variant-numeric:tabular-nums;}

/* ---------- buttons ---------- */
.btn-primary{display:block;width:100%;padding:15px;border:none;border-radius:12px;background:var(--accent);color:#fff;font-size:17px;font-weight:700;cursor:pointer;box-shadow:var(--shadow);}
.btn-primary:active{background:var(--blue-d);}
.btn-ghost{display:block;width:100%;padding:13px;border:1.5px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-size:15px;cursor:pointer;}
.btn-ghost:active{background:#f0f2f6;}
.btn-ghost.wide{margin-top:10px;}

/* ---------- previous tests ---------- */
.prev-summary{font-size:14px;color:var(--muted);margin-bottom:12px;}
.prev-list{display:flex;flex-direction:column;gap:10px;}
.prev-item{display:flex;align-items:center;gap:12px;padding:13px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;}
.prev-item .pv-main{flex:1;}
.prev-item .pv-title{font-size:15px;font-weight:600;}
.prev-item .pv-sub{font-size:12px;color:var(--muted);margin-top:2px;}
.prev-item .pv-score{font-weight:800;font-size:17px;color:var(--accent);white-space:nowrap;}
.prev-item .pv-arrow{color:var(--muted);font-size:18px;}
.prev-empty{text-align:center;color:var(--muted);font-size:14px;padding:40px 0;}

/* ---------- settings ---------- */
.seg{display:flex;gap:8px;}
.seg button{flex:1;padding:10px 8px;border:1.5px solid var(--line);background:#fff;color:var(--ink);border-radius:10px;font-size:14px;cursor:pointer;}
.seg button.active{background:var(--accent);border-color:var(--accent);color:#fff;}
.seg.small button{border-radius:0;border-right-width:0;}
.seg.small button:first-child{border-top-left-radius:10px;border-bottom-left-radius:10px;}
.seg.small button:last-child{border-top-right-radius:10px;border-bottom-right-radius:10px;border-right-width:1.5px;}
.theme-row{display:flex;gap:14px;}
.theme-dot{width:38px;height:38px;border-radius:50%;border:3px solid transparent;cursor:pointer;}
.theme-dot.active{border-color:var(--ink);}
.toggle-row{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--line);font-size:15px;}
.toggle-row:last-child{border-bottom:none;}
.toggle{width:46px;height:26px;border-radius:999px;background:var(--line);position:relative;cursor:pointer;border:none;transition:.2s;}
.toggle::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;transition:.2s;}
.toggle[aria-pressed="true"]{background:var(--green);}
.toggle[aria-pressed="true"]::after{left:23px;}

/* ---------- sync settings ---------- */
.sync-status{font-size:13px;font-weight:600;margin-bottom:10px;padding:4px 10px;border-radius:999px;display:inline-block;}
.sync-status[data-status="未配对"]{background:var(--line);color:var(--muted);}
.sync-status[data-status="已配对"]{background:var(--green-l);color:var(--green);}
.sync-status[data-status="同步中…"]{background:var(--blue-l);color:var(--accent);}
.sync-status[data-status="已同步"]{background:var(--green-l);color:var(--green);}
.sync-status[data-status="同步失败"]{background:var(--red-l);color:var(--red);}
.sync-row{display:flex;gap:8px;align-items:center;}
.sync-row input{flex:1;padding:9px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:14px;}
.sync-row input:focus{border-color:var(--accent);outline:none;}
.sync-last{font-size:12px;color:var(--muted);margin-top:8px;}

/* ---------- dialog ---------- */
.dlg-mask{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:10000;padding:24px;}
.dlg-mask[hidden]{display:none;}
.dlg{background:#fff;border-radius:16px;padding:22px 20px;max-width:340px;width:100%;box-shadow:0 10px 40px rgba(0,0,0,.2);}
.dlg-title{font-size:18px;font-weight:700;text-align:center;margin-bottom:8px;}
.dlg-sub{font-size:13.5px;color:var(--muted);text-align:center;margin-bottom:18px;line-height:1.5;}
.dlg-btns{display:flex;flex-direction:column;gap:10px;}