/* ===== 水管特工局 样式表 ===== */
:root{
  --water:#1E88E5;       /* 水管蓝 */
  --elec:#00E5FF;        /* 电学青 */
  --pos:#E53935;         /* 正极红 */
  --neg:#1565C0;         /* 负极蓝 */
  --warn:#FB8C00;        /* 警示橙 */
  --bg1:#0D1B2A;         /* 背景深 */
  --bg2:#1B3A5B;         /* 背景浅 */
  --good:#43C678;        /* 正确绿 */
  --bad:#FF5252;         /* 错误红 */
  --card:#13294A;        /* 卡片 */
  --line:#2C4A6E;        /* 描边 */
  --txt:#E8F1FA;         /* 主文字 */
  --txt2:#9FB6D1;        /* 次文字 */
  --gold:#FFD54F;
}
*{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","PingFang SC","Microsoft YaHei",sans-serif;
  background:linear-gradient(160deg,var(--bg1),var(--bg2));
  color:var(--txt);
  font-size:16px;line-height:1.5;
  overflow:hidden;
}
#app{max-width:480px;margin:0 auto;height:100%;position:relative;}

/* ===== 屏幕切换 ===== */
.screen{display:none;height:100%;flex-direction:column;overflow-y:auto;-webkit-overflow-scrolling:touch;}
.screen.active{display:flex;}
.screen.overlay{position:absolute;inset:0;z-index:50;background:rgba(5,12,24,.92);backdrop-filter:blur(4px);}

/* ===== 开始/通关页 ===== */
.hero{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:32px 24px;}
.logo-emoji{font-size:56px;margin-bottom:12px;animation:float 3s ease-in-out infinite;}
h1{margin:0 0 6px;font-size:30px;letter-spacing:2px;color:#fff;text-shadow:0 2px 12px rgba(0,229,255,.4);}
.subtitle{margin:0 0 20px;color:var(--txt2);font-size:15px;}
.badge{background:linear-gradient(135deg,var(--pos),var(--warn));color:#fff;padding:6px 16px;border-radius:20px;font-size:14px;font-weight:600;margin-bottom:18px;box-shadow:0 4px 14px rgba(229,57,53,.35);}
.progress-home{width:100%;max-width:300px;margin-bottom:22px;}
.progress-bar{height:10px;background:var(--card);border-radius:6px;overflow:hidden;border:1px solid var(--line);}
.progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--elec),var(--good));border-radius:6px;transition:width .5s;}
.progress-text{margin-top:8px;font-size:13px;color:var(--txt2);}
.hint{margin-top:18px;font-size:12px;color:var(--txt2);opacity:.8;}

/* ===== 按钮 ===== */
.btn{display:block;width:100%;padding:14px 18px;border:none;border-radius:14px;font-size:17px;font-weight:600;font-family:inherit;cursor:pointer;transition:transform .12s,box-shadow .12s;margin-bottom:10px;}
.btn:active{transform:scale(.97);}
.btn-primary{background:linear-gradient(135deg,var(--water),var(--elec));color:#04121F;box-shadow:0 6px 18px rgba(0,229,255,.3);}
.btn-ghost{background:transparent;color:var(--txt2);border:1px solid var(--line);}
#btn-next,#btn-reading-next{margin-top:8px;}

/* ===== 关卡页头部 ===== */
.level-header{display:flex;align-items:center;gap:10px;padding:12px 14px;background:rgba(13,27,42,.7);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;}
.icon-btn{flex:0 0 auto;width:38px;height:38px;border-radius:10px;background:var(--card);color:var(--txt);border:1px solid var(--line);font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;}
.level-meta{flex:1;}
.phase-tag{display:inline-block;font-size:11px;color:var(--elec);background:rgba(0,229,255,.12);padding:2px 8px;border-radius:8px;letter-spacing:1px;}
.rank-line{font-size:13px;color:var(--gold);margin-top:2px;}
.level-num{font-size:22px;font-weight:800;color:#fff;font-family:"Courier New",monospace;}

.briefing-bar{display:flex;align-items:center;gap:8px;padding:10px 14px;background:rgba(251,140,0,.12);border-bottom:1px solid rgba(251,140,0,.3);}
.briefing-icon{font-size:18px;}
#briefing-text{font-size:14px;color:var(--txt);font-weight:500;}

.progress-thin{height:4px;background:var(--card);}
.progress-thin .progress-fill{background:linear-gradient(90deg,var(--pos),var(--gold),var(--good));}

/* ===== SVG 舞台 ===== */
.svg-stage{padding:14px;display:flex;align-items:center;justify-content:center;min-height:200px;}
.svg-stage svg{width:100%;max-width:360px;height:auto;max-height:260px;}
.svg-stage.empty{min-height:20px;}

.question-text{padding:6px 16px 10px;font-size:16px;line-height:1.55;color:var(--txt);font-weight:500;}

/* ===== 选项 ===== */
.options{padding:4px 14px 8px;display:flex;flex-direction:column;gap:10px;}
.opt-btn{
  position:relative;text-align:left;padding:14px 44px 14px 16px;border-radius:14px;
  background:var(--card);color:var(--txt);border:2px solid var(--line);
  font-size:16px;font-family:inherit;cursor:pointer;line-height:1.4;transition:all .15s;
}
.opt-btn .opt-key{position:absolute;right:12px;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:var(--bg2);color:var(--txt2);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;}
.opt-btn:hover{border-color:var(--elec);}
.opt-btn.chosen{border-color:var(--elec);background:#163756;}
.opt-btn.correct{border-color:var(--good);background:rgba(67,198,120,.18);}
.opt-btn.correct .opt-key{background:var(--good);color:#04121F;}
.opt-btn.wrong{border-color:var(--bad);background:rgba(255,82,82,.16);animation:shake .4s;}
.opt-btn.wrong .opt-key{background:var(--bad);color:#fff;}
.opt-btn.disabled{opacity:.55;cursor:not-allowed;}

/* ===== 反馈 ===== */
.feedback{margin:4px 14px 12px;border-radius:12px;padding:0 14px;max-height:0;overflow:hidden;transition:max-height .35s ease,padding .25s ease;}
.feedback.show{max-height:600px;padding:12px 14px;overflow-y:auto;-webkit-overflow-scrolling:touch;}
.feedback.correct-fb{background:rgba(67,198,120,.14);border:1px solid rgba(67,198,120,.4);}
.feedback.wrong-fb{background:rgba(255,82,82,.12);border:1px solid rgba(255,82,82,.4);}
.feedback-title{font-weight:700;font-size:15px;margin-bottom:6px;display:flex;align-items:center;gap:6px;}
.feedback.correct-fb .feedback-title{color:var(--good);}
.feedback.wrong-fb .feedback-title{color:var(--bad);}
.feedback-body{font-size:14px;line-height:1.65;color:var(--txt);word-break:break-word;}

/* ===== 自定义确认弹窗（替代原生confirm，兼容微信） ===== */
#cf-mask{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:9999;display:flex;align-items:center;justify-content:center;padding:24px;}
.cf-box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 18px 14px;max-width:320px;width:100%;box-shadow:0 12px 40px rgba(0,0,0,.5);}
.cf-msg{font-size:15px;line-height:1.6;color:var(--txt);margin-bottom:16px;text-align:center;}
.cf-btns{display:flex;gap:10px;}
.cf-btn{flex:1;padding:11px;border:none;border-radius:10px;font-size:15px;font-weight:600;font-family:inherit;cursor:pointer;}
.cf-no{background:var(--bg2);color:var(--txt2);}
.cf-yes{background:linear-gradient(135deg,var(--bad),var(--warn));color:#fff;}

.next-bar{padding:0 14px 18px;}
.next-bar.hidden{display:none;}

/* ===== 阅读卡 ===== */
.reading-card{margin:auto;width:100%;max-width:480px;padding:24px 22px;overflow-y:auto;}
.reading-head{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.reading-emoji{font-size:32px;}
.reading-head h2{margin:0;color:#fff;font-size:22px;}
.reading-body{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 16px;margin-bottom:18px;line-height:1.75;font-size:15px;color:var(--txt);}
.reading-body h3{color:var(--elec);font-size:16px;margin:14px 0 6px;border-left:3px solid var(--elec);padding-left:10px;}
.reading-body h3:first-child{margin-top:0;}
.reading-body p{margin:8px 0;}
.reading-body .key{color:var(--gold);font-weight:600;}
.reading-body .pos{color:var(--pos);font-weight:600;}
.reading-body .neg{color:var(--neg);font-weight:600;}
.reading-body .water{color:var(--water);font-weight:600;}
.reading-body ul{margin:6px 0;padding-left:22px;}
.reading-body li{margin:4px 0;}
.reading-body .analogy-table{width:100%;border-collapse:collapse;margin:10px 0;font-size:14px;}
.reading-body .analogy-table th,.reading-body .analogy-table td{border:1px solid var(--line);padding:6px 8px;text-align:center;}
.reading-body .analogy-table th{background:var(--bg2);color:var(--elec);}

/* ===== 动画 ===== */
@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-8px);}}
@keyframes shake{0%,100%{transform:translateX(0);}20%{transform:translateX(-6px);}40%{transform:translateX(6px);}60%{transform:translateX(-4px);}80%{transform:translateX(4px);}}
@keyframes flow{to{stroke-dashoffset:-40;}}
@keyframes pop{0%{transform:scale(.6);opacity:0;}60%{transform:scale(1.1);}100%{transform:scale(1);opacity:1;}}
@keyframes confetti-fall{0%{transform:translateY(-20px) rotate(0);opacity:1;}100%{transform:translateY(400px) rotate(720deg);opacity:0;}}

.flow-line{stroke-dasharray:8 6;animation:flow 1.2s linear infinite;}
.celebrate{animation:pop .4s ease;}

/* SVG 通用元素 */
.wire{stroke:var(--txt);stroke-width:3;fill:none;stroke-linecap:round;}
.water-pipe{stroke:var(--water);stroke-width:10;fill:none;stroke-linecap:round;}
.water-flow{stroke:var(--elec);stroke-width:4;fill:none;stroke-linecap:round;}
.battery-pos{fill:var(--pos);}
.battery-neg{fill:var(--neg);}
.label-text{fill:var(--txt);font-size:13px;font-family:inherit;font-weight:600;}
.label-small{fill:var(--txt2);font-size:11px;font-family:inherit;}
.red-pen{stroke:var(--pos);stroke-width:5;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:400;stroke-dashoffset:400;animation:draw 1.2s ease forwards;}
.blue-pen{stroke:var(--neg);stroke-width:5;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:400;stroke-dashoffset:400;animation:draw 1.2s ease forwards;}
@keyframes draw{to{stroke-dashoffset:0;}}

@media (max-width:360px){
  h1{font-size:26px;}
  .opt-btn{font-size:15px;padding:12px 40px 12px 14px;}
  .question-text{font-size:15px;}
}