/* 船舶定位与导航 · 在线练习 —— 样式（移动优先） */
:root{
  --primary:#1E4FA8; --primary2:#2E63C4; --deep:#0E3F8C; --light:#E8EFF8; --light2:#F0F5FC;
  --mid:#3D7BD9; --text:#1A2230; --sub:#4A5568; --muted:#8B97A8; --line:#D6DCE5;
  --bg:#F3F6FB; --card:#FFFFFF; --ok:#0E9F6E; --okbg:#E7F6F0; --bad:#D64545; --badbg:#FBECEC;
  --na:#8B97A8; --nabg:#EFF1F5; --chip:#F7F9FC;
  --radius:14px; --shadow:0 1px 3px rgba(16,42,99,.06),0 4px 14px rgba(16,42,99,.06);
  --shadow2:0 2px 6px rgba(16,42,99,.10),0 10px 26px rgba(16,42,99,.10);
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",sans-serif;
  background:var(--bg); color:var(--text); font-size:15px; line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:760px;margin:0 auto;padding:14px 14px 40px;}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:12px;font-size:15px;font-weight:600;
  background:var(--primary);color:#fff;transition:transform .06s ease,opacity .15s;
  box-shadow:0 2px 6px rgba(30,79,168,.25); user-select:none;
}
.btn:active{transform:scale(.97);}
.btn.block{width:100%;}
.btn.ghost{background:var(--light);color:var(--primary);box-shadow:none;}
.btn.plain{background:transparent;color:var(--sub);box-shadow:none;font-weight:500;}
.btn.sm{padding:7px 13px;font-size:13px;border-radius:10px;}
.btn.danger{background:var(--bad);box-shadow:0 2px 6px rgba(214,69,69,.25);}
.btn[disabled]{opacity:.5;pointer-events:none;}
.btn.big{padding:16px 22px;font-size:17px;border-radius:16px;}

/* ---------- header ---------- */
#topbar{background:linear-gradient(120deg,#0E3F8C,#1E4FA8 55%,#2E63C4);color:#fff;
  box-shadow:0 2px 10px rgba(14,63,140,.25); position:sticky;top:0;z-index:30;}
.tb-inner{max-width:760px;margin:0 auto;padding:10px 14px;display:flex;align-items:center;gap:10px;}
.tb-title{display:flex;align-items:center;gap:10px;min-width:0;flex:1;}
.tb-mark{width:38px;height:38px;border-radius:11px;background:rgba(255,255,255,.16);
  display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800;
  border:1px solid rgba(255,255,255,.25); flex:none;}
.tb-name{font-size:16px;font-weight:700;letter-spacing:.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.tb-sub{font-size:12px;opacity:.82;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.tb-right{flex:none;display:flex;align-items:center;gap:6px;}
.tb-chip{background:rgba(255,255,255,.16);color:#fff;font-size:12px;padding:4px 10px;border-radius:999px;border:1px solid rgba(255,255,255,.22);}
.tb-btn{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.3);
  padding:5px 11px;border-radius:999px;font-size:12.5px;}

/* ---------- 首页 ---------- */
.hero{text-align:center;padding:26px 8px 10px;}
.hero h1{font-size:21px;margin:0 0 6px;color:var(--deep);}
.hero p{margin:0;color:var(--sub);font-size:13.5px;}
.role-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:22px 4px;}
.role-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:24px 16px 18px;text-align:center;border:1.5px solid transparent;transition:border-color .15s,box-shadow .15s;text-decoration:none;color:inherit;display:block;}
.role-card:active{transform:scale(.98);}
.role-card.stu{border-color:#BFD2EE;}
.role-card.tea{border-color:#E3C9B0;}
.role-ico{width:54px;height:54px;border-radius:16px;margin:0 auto 12px;display:flex;align-items:center;justify-content:center;
  font-size:24px;font-weight:800;color:#fff;}
.role-card.stu .role-ico{background:linear-gradient(135deg,#1E4FA8,#3D7BD9);}
.role-card.tea .role-ico{background:linear-gradient(135deg,#8A5A2B,#C08A4E);}
.role-name{font-size:18px;font-weight:700;}
.role-desc{color:var(--muted);font-size:12.5px;margin-top:5px;line-height:1.5;}
.hintbox{background:var(--light2);border:1px solid var(--line);border-radius:12px;padding:10px 13px;
  color:var(--sub);font-size:12.5px;margin:6px 4px 0;display:flex;gap:8px;align-items:flex-start;}
.hintbox b{color:var(--deep);}

/* ---------- 卡片/面板 ---------- */
.panel{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;}
.sect-title{display:flex;align-items:center;gap:8px;margin:20px 2px 10px;font-size:15px;font-weight:700;color:var(--deep);}
.sect-title:first-child{margin-top:4px;}
.sect-title .sbar{width:4px;height:16px;border-radius:3px;background:var(--primary);}
.sect-title .cnt{font-size:12px;color:var(--muted);font-weight:500;margin-left:auto;}
.block-card{display:flex;align-items:center;gap:11px;background:var(--card);border-radius:13px;
  box-shadow:var(--shadow);padding:13px 14px;margin:8px 0;border:1px solid #EDF0F6;cursor:pointer;
  transition:transform .05s,border-color .15s;}
.block-card:active{transform:scale(.985);}
.bc-left{flex:none;width:40px;height:40px;border-radius:12px;background:var(--light);color:var(--deep);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;}
.block-card.done .bc-left{background:var(--okbg);color:var(--ok);}
.bc-main{flex:1;min-width:0;}
.bc-title{font-size:14.5px;font-weight:650;color:var(--text);}
.bc-sub{font-size:12px;color:var(--muted);margin-top:2px;}
.bc-right{flex:none;text-align:right;display:flex;flex-direction:column;align-items:flex-end;gap:5px;}
.bc-arrow{color:#C3CCD8;font-size:18px;line-height:1;}
.badge{font-size:11.5px;padding:2px 9px;border-radius:999px;background:var(--light2);color:var(--sub);border:1px solid var(--line);white-space:nowrap;}
.badge.good{background:var(--okbg);color:var(--ok);border-color:#C4E6D7;}
.badge.first{background:#FDF1E3;color:#B26B1A;border-color:#F2D9B8;}
.gr-title{background:linear-gradient(120deg,#0E3F8C,#2E63C4);color:#fff;border-radius:13px;padding:13px 16px;margin:18px 0 10px;
  box-shadow:0 3px 10px rgba(30,79,168,.18);display:flex;align-items:center;gap:10px;}
.gr-title .gi{width:34px;height:34px;border-radius:10px;background:rgba(255,255,255,.18);display:flex;align-items:center;justify-content:center;font-weight:800;flex:none;}
.gr-title .gt{font-size:15px;font-weight:700;flex:1;min-width:0;}
.gr-title .gc{font-size:12px;opacity:.85;text-align:right;line-height:1.5;}

/* ---------- 输入 ---------- */
.field{margin:14px 0;}
.field label{display:block;font-size:13px;font-weight:600;color:var(--sub);margin-bottom:7px;}
.input{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;font-size:16px;
  background:#fff;color:var(--text);outline:none;transition:border-color .15s,box-shadow .15s;}
.input:focus{border-color:var(--mid);box-shadow:0 0 0 3px rgba(61,123,217,.14);}
.input.err{border-color:var(--bad);box-shadow:0 0 0 3px rgba(214,69,69,.12);}
.errtxt{color:var(--bad);font-size:12.5px;margin-top:6px;display:none;}
.errtxt.show{display:block;}

/* ---------- 答题 ---------- */
.quiz-top{position:sticky;top:56px;z-index:20;background:var(--bg);padding:8px 0 6px;}
.q-prog{display:flex;align-items:center;gap:10px;}
.q-prog .bar{flex:1;height:7px;border-radius:6px;background:#DCE3EE;overflow:hidden;}
.q-prog .bar i{display:block;height:100%;background:linear-gradient(90deg,#1E4FA8,#3D7BD9);border-radius:6px;transition:width .2s;}
.q-num{font-size:13px;color:var(--deep);font-weight:700;white-space:nowrap;}
.q-grid{display:flex;gap:5px;overflow-x:auto;padding:9px 1px 3px;scrollbar-width:none;}
.q-grid::-webkit-scrollbar{display:none;}
.q-grid .cell{flex:none;width:27px;height:27px;border-radius:8px;background:#fff;border:1.5px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--sub);}
.q-grid .cell.cur{border-color:var(--primary);color:var(--primary);font-weight:700;background:var(--light);}
.q-grid .cell.answered{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:700;}
.q-grid .cell.clicked{background:var(--primary2);border-color:var(--primary2);color:#fff;}
.q-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 16px 12px;margin-top:8px;}
.q-meta{display:flex;align-items:center;gap:8px;margin-bottom:10px;}
.q-no{background:var(--light);color:var(--deep);font-weight:700;font-size:12.5px;padding:3px 11px;border-radius:999px;}
.q-type{background:var(--light2);color:var(--sub);font-size:12px;padding:3px 10px;border-radius:999px;border:1px solid var(--line);}
.q-stem{font-size:16.5px;font-weight:650;color:var(--text);line-height:1.65;}
.opt-list{margin:12px 0 6px;display:flex;flex-direction:column;gap:8px;}
.opt{display:flex;align-items:flex-start;gap:10px;border:1.5px solid var(--line);border-radius:12px;
  padding:11px 13px;background:#fff;cursor:pointer;transition:border-color .12s,background .12s;user-select:none;}
.opt:active{background:var(--light2);}
.opt .okey{flex:none;width:25px;height:25px;border-radius:8px;background:var(--chip);border:1.5px solid #C6D0DE;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;color:var(--sub);margin-top:1px;}
.opt .otxt{flex:1;font-size:15px;color:var(--text);line-height:1.55;word-break:break-word;}
.opt.sel{border-color:var(--primary);background:var(--light2);}
.opt.sel .okey{background:var(--primary);border-color:var(--primary);color:#fff;}
.quiz-nav{display:flex;gap:10px;margin:16px 0 6px;}
.quiz-nav .btn{flex:1;}
.quiz-nav .btn.submit{flex:1.4;}
.q-legend{display:flex;gap:14px;justify-content:flex-end;padding:6px 2px 2px;font-size:11.5px;color:var(--muted);}
.q-legend span{display:inline-flex;align-items:center;gap:5px;}
.dot{width:9px;height:9px;border-radius:3px;display:inline-block;}
.dot.a{background:var(--primary);} .dot.b{background:#fff;border:1.5px solid var(--line);}

/* ---------- 结果 ---------- */
.res-hero{text-align:center;padding:6px 6px 14px;}
.res-emoji{font-size:44px;}
.res-h1{font-size:19px;font-weight:800;margin:4px 0 2px;color:var(--deep);}
.res-sub{color:var(--sub);font-size:13.5px;}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:6px 0 14px;}
.stat{background:var(--card);border-radius:13px;box-shadow:var(--shadow);padding:13px 6px;text-align:center;}
.stat .sv{font-size:26px;font-weight:800;line-height:1.2;}
.stat .sl{font-size:12px;color:var(--muted);margin-top:3px;}
.stat.ok .sv{color:var(--ok);} .stat.bad .sv{color:var(--bad);} .stat.na .sv{color:var(--na);}
.rate-line{height:9px;border-radius:6px;background:#E3E9F2;overflow:hidden;margin:8px 6px 4px;}
.rate-line i{display:block;height:100%;background:linear-gradient(90deg,#0E9F6E,#34C48D);border-radius:6px;}

/* 逐题回看 */
.rv-list{display:flex;flex-direction:column;gap:8px;}
.rv-item{background:var(--card);border-radius:12px;box-shadow:var(--shadow);border-left:5px solid var(--line);overflow:hidden;}
.rv-item.ok{border-left-color:var(--ok);} .rv-item.bad{border-left-color:var(--bad);} .rv-item.na{border-left-color:var(--na);}
.rv-head{display:flex;align-items:center;gap:10px;padding:11px 13px;cursor:pointer;}
.rv-flag{flex:none;width:30px;height:30px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:800;}
.rv-item.ok .rv-flag{background:var(--okbg);color:var(--ok);}
.rv-item.bad .rv-flag{background:var(--badbg);color:var(--bad);}
.rv-item.na .rv-flag{background:var(--nabg);color:var(--na);}
.rv-no{flex:none;font-weight:700;color:var(--deep);font-size:13px;background:var(--light);padding:2px 8px;border-radius:6px;}
.rv-what{flex:1;min-width:0;font-size:13px;color:var(--sub);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.rv-open{color:#B9C3D1;flex:none;}
.rv-body{display:none;border-top:1px dashed var(--line);padding:11px 13px 13px;}
.rv-item.open .rv-body{display:block;}
.rv-stem{font-size:14.5px;font-weight:600;line-height:1.6;margin-bottom:9px;}
.rv-opts{display:flex;flex-direction:column;gap:5px;}
.rv-opt{font-size:13.5px;padding:7px 10px;border-radius:9px;background:var(--light2);display:flex;gap:8px;}
.rv-opt .k{font-weight:700;color:var(--deep);}
.rv-opt.your-ok{background:var(--okbg);} .rv-opt.your-bad{background:var(--badbg);} .rv-opt.ans-right{background:var(--okbg);}
.rv-opt .tag{margin-left:auto;flex:none;font-size:11px;font-weight:700;border-radius:6px;padding:1px 7px;align-self:center;}
.rv-opt.your-bad .tag{background:#fff;color:var(--bad);}
.rv-opt.your-ok .tag{background:#fff;color:var(--ok);}
.rv-opt.ans-right .tag{background:#fff;color:var(--ok);}
.rv-note{font-size:11.5px;color:var(--na);margin-top:8px;}
.mini-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:2px;}

/* ---------- 教师 ---------- */
.tea-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:4px 0 6px;}
.tea-head .tt{font-size:16px;font-weight:800;color:var(--deep);}
.tea-head .sp{flex:1;}
.stu-card{display:flex;align-items:center;gap:12px;background:var(--card);border-radius:13px;box-shadow:var(--shadow);
  padding:13px 14px;margin:9px 0;cursor:pointer;border:1px solid #EDF0F6;}
.stu-card:active{transform:scale(.987);}
.avatar{flex:none;width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#1E4FA8,#3D7BD9);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;}
.stu-main{flex:1;min-width:0;}
.stu-name{font-size:15.5px;font-weight:700;}
.stu-meta{font-size:12px;color:var(--muted);margin-top:2px;}
.stu-right{flex:none;text-align:right;}
.rate-pill{font-size:12.5px;font-weight:700;padding:4px 10px;border-radius:999px;background:var(--light);color:var(--deep);}
.rate-pill.good{background:var(--okbg);color:var(--ok);}
.rate-pill.low{background:var(--badbg);color:var(--bad);}

.att-item{background:var(--card);border-radius:13px;box-shadow:var(--shadow);margin:10px 0;overflow:hidden;}
.att-head{display:flex;align-items:center;gap:10px;padding:12px 14px;cursor:pointer;}
.att-block{flex:1;min-width:0;}
.att-block .ab1{font-size:14.5px;font-weight:700;color:var(--text);}
.att-block .ab2{font-size:12px;color:var(--muted);margin-top:2px;}
.att-stats{display:flex;gap:8px;flex:none;font-size:11.5px;}
.att-stats .n{text-align:center;background:var(--light2);border-radius:8px;padding:4px 8px;min-width:34px;}
.att-stats .n b{display:block;font-size:14px;}
.att-stats .n.ok b{color:var(--ok);} .att-stats .n.bad b{color:var(--bad);} .att-stats .n.na b{color:var(--na);}
.att-stats .n span{color:var(--muted);font-size:10px;}
.att-open{color:#B9C3D1;flex:none;}
.att-body{display:none;border-top:1px dashed var(--line);padding:10px 12px;}
.att-item.open .att-body{display:block;}

.empty{text-align:center;color:var(--muted);padding:36px 12px;font-size:14px;line-height:2;}
.empty .big{font-size:38px;display:block;}

/* ---------- 弹窗 / toast ---------- */
.dlg-mask{position:fixed;inset:0;background:rgba(12,26,54,.45);z-index:80;display:flex;align-items:center;justify-content:center;padding:22px;}
.dlg-mask[hidden]{display:none;}
.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%);background:rgba(18,28,45,.92);color:#fff;
  padding:10px 20px;border-radius:999px;font-size:13.5px;z-index:99;box-shadow:var(--shadow2);max-width:84vw;text-align:center;}
.toast[hidden]{display:none;}
.dlg{background:#fff;border-radius:16px;box-shadow:var(--shadow2);width:100%;max-width:420px;padding:20px;max-height:80vh;overflow:auto;}
.dlg-title{font-size:16.5px;font-weight:800;color:var(--deep);margin-bottom:10px;}
.dlg-body{font-size:14.5px;color:var(--text);line-height:1.7;}
.dlg-actions{display:flex;gap:10px;margin-top:18px;}
.dlg-actions .btn{flex:1;}
.foot{text-align:center;color:#B4BECC;font-size:11.5px;padding:14px 10px 30px;}

/* ---------- 双模式（顺序练习/乱序测试） ---------- */
.tt{font-size:16px;font-weight:800;color:var(--deep);}
.bk-title{font-size:19px;font-weight:800;color:var(--text);line-height:1.4;}
.bk-sub{font-size:12.5px;color:var(--muted);margin-top:3px;}
.mtag{display:inline-flex;align-items:center;font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;white-space:nowrap;}
.mtag.seq{background:var(--light);color:var(--deep);}
.mtag.shuf{background:#FDF1E3;color:#B26B1A;border:1px solid #F2D9B8;}
.mtag.exam{background:#EAF3FD;color:#1F67FE;border:1px solid #C7DEF8;}
.mtag.err{background:var(--badbg);color:var(--bad);}
.mtag.none{background:var(--light2);color:var(--muted);border:1px solid var(--line);}
.mt-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 2px 6px;}
.mtile{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 16px 14px;
  cursor:pointer;border:1.5px solid #C9D8EF;text-align:center;display:flex;flex-direction:column;align-items:center;
  transition:transform .06s,border-color .15s,box-shadow .15s;}
.mtile.warm{border-color:#EFD5B4;}
.mtile:active{transform:scale(.975);}
.mt-ico{width:46px;height:46px;border-radius:15px;font-size:21px;font-weight:800;color:#fff;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#1E4FA8,#3D7BD9);box-shadow:0 4px 10px rgba(30,79,168,.25);}
.mtile.warm .mt-ico{background:linear-gradient(135deg,#B26B1A,#E09A3E);box-shadow:0 4px 10px rgba(178,107,26,.25);}
.mt-name{font-size:16.5px;font-weight:800;color:var(--text);margin-top:10px;}
.mt-desc{font-size:11.5px;color:var(--muted);line-height:1.55;margin-top:5px;min-height:34px;}
.mt-foot{width:100%;margin-top:12px;display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap;}
.mt-go{margin-left:auto;color:var(--primary);font-weight:700;font-size:13px;}
.mtile.warm .mt-go{color:#B26B1A;}

/* ---------- 教师：分段 & 章节块 Tab ---------- */
.seg{display:flex;background:#E4EAF3;border-radius:12px;padding:4px;margin:6px 0 12px;gap:4px;}
.seg-btn{flex:1;border:none;background:transparent;color:var(--sub);font-weight:600;font-size:14px;
  padding:9px 10px;border-radius:9px;cursor:pointer;}
.seg-btn.on{background:var(--primary);color:#fff;box-shadow:0 2px 6px rgba(30,79,168,.3);}
.tabbar{display:flex;gap:8px;margin:14px 2px 12px;overflow-x:auto;scrollbar-width:none;}
.tabbar::-webkit-scrollbar{display:none;}
.tb-tab{flex:none;display:inline-flex;align-items:center;gap:7px;background:var(--card);border:1.5px solid var(--line);
  color:var(--sub);font-size:13.5px;font-weight:700;padding:9px 14px;border-radius:999px;cursor:pointer;box-shadow:var(--shadow);}
.tb-tab.on{background:var(--deep);border-color:var(--deep);color:#fff;}
.tb-tab .tab-c{background:var(--light2);color:var(--sub);font-size:11px;border-radius:999px;padding:1px 8px;font-weight:700;}
.tb-tab.on .tab-c{background:rgba(255,255,255,.22);color:#fff;}
.tb-tab .tab-c.err{background:var(--badbg);color:var(--bad);}
.tb-tab.on .tab-c.err{background:rgba(214,69,69,.85);color:#fff;}

/* 错题榜排名徽标 */
.rk-rank{flex:none;width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#D64545,#EF7A5A);
  color:#fff;font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center;}

@media (min-width:520px){ .block-card,.stu-card{padding:14px 16px;} .tb-inner{padding:12px 18px;} .wrap{padding-top:18px;} }