/* 知考 C 端 · Design Tokens & 双端布局 */
:root{
  --primary-600:#4F5CF0;
  --primary-500:#6B76F7;
  --primary-50:#EEF0FF;
  --ai-grad:linear-gradient(135deg,#7C3AED,#4F5CF0);
  --ai-purple:#7C3AED;
  --success:#22C55E;
  --error:#F43F5E;
  --warning:#F59E0B;
  --info:#0EA5E9;
  --text-primary:#1E293B;
  --text-secondary:#64748B;
  --text-tertiary:#94A3B8;
  --border:#E2E8F0;
  --bg-page:#F8FAFC;
  --bg-card:#FFFFFF;
  --sidebar-w:240px;
  --sidebar-collapsed:68px;
  --topbar-h:56px;
  --tabbar-h:56px;
  --radius:12px;
  --radius-lg:16px;
  --shadow:0 4px 16px rgba(30,41,59,.08);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Segoe UI","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{height:100%;}
body{
  font-family:var(--font);background:var(--bg-page);color:var(--text-primary);
  font-size:15px;line-height:1.5;
}
a{color:var(--primary-600);text-decoration:none;}
button,input,select,textarea{font-family:inherit;font-size:inherit;}
button{cursor:pointer;}
img{max-width:100%;}
.svg-icon{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;line-height:0;vertical-align:middle;}
.svg-icon svg{display:block;}
/* 图标容器内 SVG 居中 */
.s-ic .svg-icon,
.g-ic .svg-icon,
.mc-ic .svg-icon,
.task-item .ic .svg-icon,
.b-icon .svg-icon,
.a-ic .svg-icon,
.ai-avatar-ic .svg-icon,
.chat-quick .svg-icon,
.c-label .svg-icon,
.ah-badge .svg-icon{display:inline-flex;}
.tabular{font-variant-numeric:tabular-nums;}

/* ========== 通用组件 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 18px;border-radius:10px;border:none;font-weight:600;font-size:14px;
  transition:all .15s;cursor:pointer;
}
.btn-primary{background:var(--primary-600);color:#fff;}
.btn-primary:hover{background:var(--primary-500);}
.btn-primary:disabled{background:var(--border);color:var(--text-tertiary);cursor:not-allowed;}
.btn-secondary{background:var(--bg-card);color:var(--text-secondary);border:1px solid var(--border);}
.btn-secondary:hover{border-color:var(--primary-600);color:var(--primary-600);}
.btn-ai{background:var(--ai-grad);color:#fff;box-shadow:0 6px 16px rgba(124,58,237,.28);}
.btn-block{width:100%;}
.btn-lg{padding:14px 20px;font-size:16px;border-radius:12px;}
.btn-sm{padding:6px 12px;font-size:13px;border-radius:8px;}
.btn-ghost{background:transparent;color:var(--text-secondary);border:none;}
.btn-ghost:hover{color:var(--primary-600);}

.card{
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px;
}
.tag{
  display:inline-flex;align-items:center;font-size:12px;padding:3px 10px;border-radius:6px;
  background:var(--primary-50);color:var(--primary-600);font-weight:600;
}
.tag-success{background:#ECFDF3;color:var(--success);}
.tag-error{background:#FEF1F3;color:var(--error);}
.tag-warning{background:#FEF3C7;color:var(--warning);}
.tag-ai{background:#F3EEFF;color:var(--ai-purple);}

.input,.select{
  width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:10px;
  background:var(--bg-card);outline:none;transition:border .15s;
}
.input:focus,.select:focus{border-color:var(--primary-600);box-shadow:0 0 0 3px rgba(79,92,240,.12);}
.form-group{margin-bottom:14px;}
.form-group label{display:block;font-size:13px;color:var(--text-secondary);margin-bottom:6px;font-weight:500;}

.toast{
  position:fixed;top:20px;left:50%;transform:translateX(-50%) translateY(-20px);
  background:rgba(30,41,59,.92);color:#fff;padding:10px 18px;border-radius:10px;
  font-size:13px;z-index:9999;opacity:0;transition:all .25s;pointer-events:none;max-width:90%;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

.empty{
  text-align:center;padding:48px 20px;color:var(--text-tertiary);
}
.empty .e-title{font-size:15px;color:var(--text-secondary);margin-bottom:6px;}
.empty .e-desc{font-size:13px;}

.section-title{font-size:15px;font-weight:700;margin:20px 0 12px;}
.page-title{font-size:20px;font-weight:700;margin-bottom:16px;}

/* 进度条 */
.progress{height:8px;background:var(--border);border-radius:99px;overflow:hidden;}
.progress > i{display:block;height:100%;background:var(--primary-600);border-radius:99px;transition:width .3s;}
.progress.success > i{background:var(--success);}
.progress.warning > i{background:var(--warning);}
.progress.error > i{background:var(--error);}
.progress.ai > i{background:var(--ai-grad);}

/* ========== 登录页 ========== */
.auth-page{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(160deg,#EEF0FF 0%,#F8FAFC 40%,#F3EEFF 100%);
  padding:24px;
}
.auth-card{
  width:100%;max-width:400px;background:var(--bg-card);border-radius:20px;
  padding:36px 28px;box-shadow:0 20px 60px rgba(79,92,240,.12);border:1px solid var(--border);
}
.auth-logo{
  display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:8px;
}
.auth-logo .mark{
  width:44px;height:44px;border-radius:12px;background:var(--ai-grad);
  display:flex;align-items:center;justify-content:center;color:#fff;
}
.auth-logo .name{font-size:24px;font-weight:700;}
.auth-sub{text-align:center;color:var(--text-secondary);font-size:13px;margin-bottom:28px;}
.auth-tabs{display:flex;gap:8px;margin-bottom:20px;background:var(--bg-page);padding:4px;border-radius:10px;}
.auth-tabs button{
  flex:1;padding:10px;border:none;background:transparent;border-radius:8px;
  color:var(--text-secondary);font-weight:600;font-size:14px;
}
.auth-tabs button.active{background:var(--bg-card);color:var(--primary-600);box-shadow:0 1px 4px rgba(0,0,0,.06);}
.auth-error{background:#FEF1F3;color:var(--error);padding:10px 12px;border-radius:8px;font-size:13px;margin-bottom:12px;display:none;}
.auth-error.show{display:block;}
.auth-hint{text-align:center;margin-top:16px;font-size:12px;color:var(--text-tertiary);}

/* ========== 应用壳（单内容区双端） ========== */
.app-shell{
  min-height:100vh;display:flex;flex-direction:column;background:var(--bg-page);
}
.main-area{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0;}
.page-content{
  flex:1;overflow-y:auto;padding-bottom:calc(var(--tabbar-h) + 12px);
}
.h5-topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;background:var(--bg-page);position:sticky;top:0;z-index:20;
}
.h5-topbar .subject{
  display:flex;align-items:center;gap:4px;font-weight:600;font-size:15px;cursor:pointer;
}
.tabbar{
  position:fixed;bottom:0;left:0;right:0;width:100%;
  display:flex;border-top:1px solid var(--border);background:var(--bg-card);
  height:var(--tabbar-h);z-index:30;padding-bottom:env(safe-area-inset-bottom);
}
.tabbar .tab{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  color:var(--text-tertiary);font-size:11px;text-decoration:none;background:none;border:none;
}
.tabbar .tab.active{color:var(--primary-600);font-weight:600;}
.tabbar .tab .tb-ic{width:24px;height:24px;display:flex;align-items:center;justify-content:center;}
.tabbar .tab.ai-tab .tb-ic{
  width:30px;height:30px;border-radius:50%;background:var(--ai-grad);color:#fff;
  box-shadow:0 3px 8px rgba(124,58,237,.3);
}
.tabbar .tab.ai-tab.active{color:var(--ai-purple);}

.sidebar{display:none;}
.pc-topbar{display:none;}

.sidebar{
  width:var(--sidebar-w);background:#1E293B;color:#fff;flex-direction:column;
  flex-shrink:0;transition:width .25s;overflow:hidden;z-index:10;
}
.sidebar.collapsed{width:var(--sidebar-collapsed);}
.sidebar-logo{
  height:var(--topbar-h);display:flex;align-items:center;gap:10px;padding:0 16px;
  border-bottom:1px solid rgba(255,255,255,.08);flex-shrink:0;
}
.sidebar-logo .logo-mark{
  width:32px;height:32px;border-radius:8px;background:var(--ai-grad);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff;
}
.sidebar-logo .logo-text{font-size:18px;font-weight:700;white-space:nowrap;}
.sidebar-logo .collapse-btn{margin-left:auto;color:rgba(255,255,255,.5);padding:4px;}
.sidebar.collapsed .logo-text,.sidebar.collapsed .nav-label,.sidebar.collapsed .nav-group-label,
.sidebar.collapsed .user-info,.sidebar.collapsed .nav-badge{opacity:0;width:0;overflow:hidden;padding:0;margin:0;display:none;}
.sidebar-nav{flex:1;padding:12px 0;overflow-y:auto;}
.nav-group{margin-bottom:8px;}
.nav-group-label{font-size:11px;color:rgba(255,255,255,.35);padding:8px 20px 4px;letter-spacing:.5px;}
.nav-item{
  display:flex;align-items:center;gap:12px;padding:10px 20px;cursor:pointer;
  color:rgba(255,255,255,.65);transition:all .15s;white-space:nowrap;position:relative;
  text-decoration:none;border:none;background:none;width:100%;font-size:14px;
}
.nav-item:hover{background:rgba(255,255,255,.06);color:#fff;}
.nav-item.active{background:rgba(79,92,240,.15);color:#fff;}
.nav-item.active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:20px;background:var(--primary-600);border-radius:0 3px 3px 0;
}
.nav-item .nav-ic{display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.nav-item.ai-item .nav-ic{
  width:28px;height:28px;border-radius:50%;background:var(--ai-grad);
  display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(124,58,237,.4);
}
.nav-badge{
  margin-left:auto;background:var(--error);color:#fff;font-size:11px;padding:2px 7px;
  border-radius:99px;font-weight:600;
}
.sidebar-footer{
  padding:16px;border-top:1px solid rgba(255,255,255,.08);display:flex;align-items:center;gap:10px;
}
.sidebar-footer .avatar.guest-login-link,
a.guest-login-link.avatar{
  text-decoration:none;color:inherit;display:flex;align-items:center;justify-content:center;
}
body.is-guest .sidebar-footer .name a{color:inherit;}
.sidebar-footer .avatar{
  width:34px;height:34px;border-radius:50%;background:var(--ai-grad);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0;
}
.sidebar-footer .user-info .name{font-size:13px;font-weight:600;}
.sidebar-footer .user-info .sub{font-size:11px;color:rgba(255,255,255,.45);}

.pc-topbar{
  height:var(--topbar-h);background:var(--bg-card);border-bottom:1px solid var(--border);
  align-items:center;padding:0 24px;gap:16px;flex-shrink:0;
}
.exam-switch{
  display:flex;align-items:center;gap:6px;padding:6px 14px;border-radius:8px;
  background:var(--primary-50);color:var(--primary-600);font-size:14px;font-weight:600;cursor:pointer;
  border:1px solid transparent;
}
.exam-switch:hover{border-color:var(--primary-600);}
.search-box{flex:1;max-width:400px;position:relative;}
.search-box input{
  width:100%;padding:8px 16px 8px 36px;border-radius:8px;border:1px solid var(--border);
  background:var(--bg-page);font-size:14px;outline:none;
}
.search-box input:focus{border-color:var(--primary-600);}
.search-box .s-ic{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--text-tertiary);}

/* H5：窄屏 */
@media (max-width:899px){
  .sidebar,.pc-topbar{display:none !important;}
  .app-shell{max-width:480px;margin:0 auto;}
  .tabbar{max-width:480px;left:50%;transform:translateX(-50%);}
}
/* PC：宽屏 */
@media (min-width:900px){
  html,body{height:100%;width:100%;}
  body.has-app-shell{overflow:hidden;margin:0;}
  .app-shell{
    flex-direction:row;height:100vh;width:100%;max-width:none;
    overflow:hidden;margin:0;
  }
  .sidebar{display:flex;height:100vh;}
  .main-area{flex:1;min-width:0;height:100vh;width:auto;}
  .pc-topbar{display:flex;width:100%;}
  .tabbar{display:none !important;}
  .page-content{
    padding:24px 32px 32px;padding-bottom:32px;overflow-y:auto;
    width:100%;max-width:none;box-sizing:border-box;
    flex:1;min-height:0;
  }
  .page-content > .h5-pad,
  .page-content > .list-page,
  .page-content .list-page{
    max-width:none;width:100%;box-sizing:border-box;
  }
  .h5-topbar,.only-h5{display:none !important;}
  .h5-pad{padding-left:0;padding-right:0;}
}

/* ========== 首页 ========== */
.checkin-card{
  background:var(--ai-grad);border-radius:var(--radius-lg);padding:20px;color:#fff;margin-bottom:16px;
  position:relative;overflow:hidden;
}
.checkin-card::after{
  content:"";position:absolute;right:-30px;top:-30px;width:140px;height:140px;
  background:rgba(255,255,255,.12);border-radius:50%;
}
.checkin-card .c-label{font-size:13px;opacity:.9;display:flex;align-items:center;gap:6px;}
.checkin-card .c-title{font-size:22px;font-weight:700;margin:4px 0 12px;position:relative;z-index:1;}
.checkin-card .c-bar{height:8px;background:rgba(255,255,255,.25);border-radius:99px;overflow:hidden;margin-bottom:8px;}
.checkin-card .c-bar i{display:block;height:100%;background:#fff;border-radius:99px;}
.checkin-card .c-sub{font-size:12px;opacity:.85;position:relative;z-index:1;}

.task-card{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);}
.task-item{display:flex;align-items:center;gap:12px;padding:16px;border-bottom:1px solid var(--border);}
.task-item:last-child{border-bottom:none;}
.task-item .ic{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.task-item .ic.blue{background:var(--primary-50);color:var(--primary-600);}
.task-item .ic.purple{background:#F3EEFF;color:var(--ai-purple);}
.task-item .ic.green{background:#ECFDF3;color:var(--success);}
.task-item .t-info{flex:1;min-width:0;}
.task-item .t-name{font-size:14px;font-weight:600;}
.task-item .t-desc{font-size:12px;color:var(--text-secondary);margin-top:2px;}

.grid-entry{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
.grid-entry .g{
  display:flex;flex-direction:column;align-items:center;gap:8px;padding:14px 0;
  cursor:pointer;text-decoration:none;color:inherit;border:none;background:none;
}
.grid-entry .g .g-ic{
  width:48px;height:48px;border-radius:14px;background:var(--bg-card);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;color:var(--primary-600);
}
.grid-entry .g .g-t{font-size:12px;color:var(--text-secondary);}
.grid-entry .g.ai .g-ic{background:var(--ai-grad);border:none;color:#fff;box-shadow:0 6px 16px rgba(124,58,237,.3);}
.grid-entry .g.ai .g-t{color:var(--ai-purple);font-weight:600;}

/* PC 首页网格 */
.home-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:24px;width:100%;}
.home-grid .stat-card{width:100%;min-width:0;}
.stat-card{
  background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:20px;
  display:flex;align-items:center;gap:16px;
}
.stat-card .s-ic{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;}
.stat-card .s-ic.blue{background:var(--primary-50);color:var(--primary-600);}
.stat-card .s-ic.green{background:#ECFDF3;color:var(--success);}
.stat-card .s-ic.orange{background:#FEF3C7;color:var(--warning);}
.stat-card .s-val{font-size:24px;font-weight:700;}
.stat-card .s-label{font-size:13px;color:var(--text-secondary);margin-top:2px;}
.task-row{display:flex;gap:12px;flex-wrap:wrap;}
.task-card-pc{
  flex:1;min-width:200px;background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:18px;
  display:flex;align-items:center;gap:14px;cursor:pointer;transition:all .15s;text-decoration:none;color:inherit;
}
.task-card-pc:hover{border-color:var(--primary-600);box-shadow:0 4px 12px rgba(79,92,240,.1);}
.heatmap-grid{display:flex;gap:3px;flex-wrap:wrap;}
.heatmap-grid .cell{width:12px;height:12px;border-radius:2px;background:var(--border);}
.heatmap-grid .cell.l1{background:#C7D2FE;}
.heatmap-grid .cell.l2{background:#818CF8;}
.heatmap-grid .cell.l3{background:#4F46E5;}
.heatmap-grid .cell.l4{background:#3730A3;}

/* ========== 刷题 ========== */
.quiz-shell{display:flex;flex-direction:column;height:100%;min-height:0;}
.quiz-progress{display:flex;align-items:center;gap:12px;padding:4px 0 14px;}
.quiz-progress .bar{flex:1;height:6px;background:var(--border);border-radius:99px;overflow:hidden;}
.quiz-progress .bar i{display:block;height:100%;background:var(--primary-600);border-radius:99px;transition:width .3s;}
.quiz-progress .count,.quiz-progress .timer{font-size:13px;color:var(--text-secondary);white-space:nowrap;display:flex;align-items:center;gap:4px;}

.quiz-meta{display:flex;align-items:center;gap:8px;margin-bottom:12px;flex-wrap:wrap;}
.question-text{font-size:16px;line-height:1.65;font-weight:500;margin-bottom:18px;}
@media (min-width:900px){.question-text{font-size:17px;line-height:1.7;}}

.options{display:flex;flex-direction:column;gap:10px;margin-bottom:20px;}
.option{
  display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border-radius:12px;
  border:1.5px solid var(--border);background:var(--bg-card);cursor:pointer;transition:all .15s;text-align:left;
  width:100%;font-size:15px;color:var(--text-primary);
}
.option:hover:not(.disabled){border-color:var(--primary-500);}
.option:active:not(.disabled){transform:scale(.99);}
.option .opt-letter{
  width:26px;height:26px;border-radius:8px;background:var(--bg-page);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;
  color:var(--text-secondary);flex-shrink:0;border:1px solid var(--border);transition:all .15s;margin-top:1px;
}
.option .opt-text{flex:1;line-height:1.55;}
.option.selected{border-color:var(--primary-600);background:var(--primary-50);}
.option.selected .opt-letter{background:var(--primary-600);color:#fff;border-color:var(--primary-600);}
.option.correct{border-color:var(--success);background:#ECFDF3;}
.option.correct .opt-letter{background:var(--success);color:#fff;border-color:var(--success);}
.option.wrong{border-color:var(--error);background:#FEF1F3;}
.option.wrong .opt-letter{background:var(--error);color:#fff;border-color:var(--error);}
.option.dim{opacity:.5;}
.option.disabled{cursor:default;}

.quiz-footer{padding:12px 0 8px;flex-shrink:0;}
.quiz-tools{display:flex;justify-content:space-around;margin-top:12px;}
.quiz-tools button{background:none;border:none;color:var(--text-secondary);font-size:13px;display:flex;align-items:center;gap:4px;}

.result-panel{display:none;margin-top:6px;}
.result-panel.show{display:block;}
.result-banner{
  display:flex;align-items:center;gap:10px;padding:14px 16px;border-radius:12px;margin-bottom:14px;
  font-weight:600;font-size:15px;
}
.result-banner.ok{background:#ECFDF3;color:var(--success);}
.result-banner.fail{background:#FEF1F3;color:var(--error);}
.explain-box{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:14px;}
.explain-box .e-title{font-size:14px;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:6px;}
.explain-box .e-text{font-size:14px;line-height:1.7;color:var(--text-secondary);}
.ai-cta{
  display:flex;align-items:center;gap:12px;padding:16px;border-radius:12px;margin-bottom:14px;
  background:var(--ai-grad);color:#fff;cursor:pointer;border:none;width:100%;text-align:left;
  box-shadow:0 8px 20px rgba(124,58,237,.28);
}
.ai-cta .a-ic{
  width:40px;height:40px;border-radius:12px;background:rgba(255,255,255,.2);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff;
}
.ai-cta .a-arrow{opacity:.85;display:flex;align-items:center;}
.ai-cta .a-info{flex:1;}
.ai-cta .a-t{font-size:15px;font-weight:700;}
.ai-cta .a-d{font-size:12px;opacity:.9;margin-top:2px;}

/* PC 刷题双栏 */
.quiz-layout{display:flex;height:calc(100vh - var(--topbar-h));min-height:0;}
.quiz-main{flex:1;display:flex;flex-direction:column;min-width:0;border-right:1px solid var(--border);overflow:hidden;}
.quiz-main-scroll{flex:1;overflow-y:auto;padding:32px 48px;}
.quiz-inner{max-width:720px;margin:0 auto;width:100%;}
.quiz-right{
  width:320px;background:var(--bg-card);display:flex;flex-direction:column;flex-shrink:0;overflow:hidden;
}
.right-tabs{display:flex;border-bottom:1px solid var(--border);}
.right-tabs .rt{
  flex:1;padding:12px 0;text-align:center;font-size:13px;font-weight:500;
  color:var(--text-tertiary);cursor:pointer;border:none;background:none;border-bottom:2px solid transparent;
}
.right-tabs .rt.active{color:var(--primary-600);border-bottom-color:var(--primary-600);font-weight:600;}
.right-panel{flex:1;overflow-y:auto;padding:16px;display:none;}
.right-panel.active{display:block;}
.ac-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;}
.ac-cell{
  aspect-ratio:1;border-radius:8px;border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:500;
  color:var(--text-secondary);cursor:pointer;background:var(--bg-card);
}
.ac-cell:hover{border-color:var(--primary-600);}
.ac-cell.current{border-color:var(--primary-600);background:var(--primary-50);color:var(--primary-600);font-weight:700;}
.ac-cell.answered{background:var(--primary-600);color:#fff;border-color:var(--primary-600);}
.ac-cell.correct-cell{background:var(--success);color:#fff;border-color:var(--success);}
.ac-cell.wrong-cell{background:var(--error);color:#fff;border-color:var(--error);}

/* ========== AI 对话 ========== */
.ai-layout{display:flex;flex-direction:column;height:100%;min-height:calc(100vh - 120px);}
@media (min-width:900px){
  .ai-layout{flex-direction:row;height:calc(100vh - var(--topbar-h));}
}
.ai-main{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0;}
.ai-header{background:var(--ai-grad);padding:16px 20px;color:#fff;flex-shrink:0;}
.ai-header .ah-name{font-size:16px;font-weight:700;}
.ai-header .ah-ctx{font-size:12px;opacity:.85;}
.ai-header .ah-badge{
  display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.2);
  padding:4px 10px;border-radius:99px;font-size:12px;margin-top:8px;
}
.ai-avatar-ic{
  width:40px;height:40px;border-radius:12px;background:rgba(255,255,255,.2);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff;
}
.chat-body{flex:1;overflow-y:auto;padding:18px 16px;display:flex;flex-direction:column;gap:14px;background:#F6F5FB;}
.bubble{max-width:85%;padding:12px 14px;border-radius:14px;font-size:14px;line-height:1.6;word-break:break-word;}
.bubble.ai{background:var(--bg-card);border:1px solid var(--border);border-top-left-radius:4px;align-self:flex-start;box-shadow:0 2px 6px rgba(30,41,59,.04);}
.bubble.user{background:var(--primary-600);color:#fff;border-top-right-radius:4px;align-self:flex-end;}
.bubble .typing{display:inline-flex;gap:3px;}
.bubble .typing i{width:6px;height:6px;border-radius:50%;background:var(--text-tertiary);animation:blink 1.2s infinite;}
.bubble .typing i:nth-child(2){animation-delay:.2s;}
.bubble .typing i:nth-child(3){animation-delay:.4s;}
@keyframes blink{0%,100%{opacity:.3;}50%{opacity:1;}}
.chat-quick{display:flex;gap:8px;flex-wrap:wrap;padding:8px 16px;background:#F6F5FB;flex-shrink:0;}
.chat-quick button{
  background:var(--bg-card);border:1px solid var(--border);border-radius:99px;
  padding:8px 14px;font-size:13px;color:var(--primary-600);font-weight:500;
  display:inline-flex;align-items:center;gap:6px;
}
.chat-quick button:hover{background:var(--primary-50);}
.chat-input{
  display:flex;align-items:center;gap:10px;padding:12px 16px;background:var(--bg-card);
  border-top:1px solid var(--border);flex-shrink:0;
}
.chat-input input{flex:1;border:none;background:var(--bg-page);border-radius:99px;padding:11px 16px;outline:none;}
.chat-input .send{
  width:40px;height:40px;border-radius:50%;background:var(--ai-grad);border:none;color:#fff;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.guest-banner-title{font-weight:700;}
.guest-banner-desc{font-size:12px;color:var(--text-secondary);margin-top:4px;}

/* ========== 列表页通用 ========== */
.list-page{padding:0 16px 24px;}
@media (min-width:900px){
  .list-page{padding:0;width:100%;max-width:none;box-sizing:border-box;}
}
.filter-tabs{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap;}
.filter-tabs button{
  padding:7px 14px;border-radius:99px;border:1px solid var(--border);background:var(--bg-card);
  font-size:13px;color:var(--text-secondary);font-weight:500;
}
.filter-tabs button.active{background:var(--primary-50);border-color:var(--primary-600);color:var(--primary-600);}
.list-item{
  background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:14px 16px;
  margin-bottom:10px;cursor:pointer;transition:all .15s;
}
.list-item:hover{border-color:var(--primary-600);}
.list-item .li-title{font-size:14px;font-weight:600;margin-bottom:6px;}
.list-item .li-meta{font-size:12px;color:var(--text-secondary);display:flex;gap:12px;flex-wrap:wrap;}
.list-item .li-actions{display:flex;gap:8px;margin-top:10px;}

/* 章节树 */
.chapter-item{
  background:var(--bg-card);border:1px solid var(--border);border-radius:12px;
  margin-bottom:8px;overflow:hidden;
}
.chapter-item .ch-head{
  display:flex;align-items:center;justify-content:space-between;padding:14px 16px;cursor:pointer;
}
.chapter-item .ch-name{font-weight:600;font-size:14px;}
.chapter-item .ch-count{font-size:12px;color:var(--text-tertiary);}
.chapter-item .ch-children{border-top:1px solid var(--border);padding:4px 0;}
.chapter-item .ch-child{
  display:flex;align-items:center;justify-content:space-between;padding:10px 16px 10px 28px;
  font-size:13px;cursor:pointer;color:var(--text-secondary);
}
.chapter-item .ch-child:hover{background:var(--primary-50);color:var(--primary-600);}

/* 我的 */
.me-header{display:flex;align-items:center;gap:14px;padding:8px 0 16px;}
.me-avatar{
  width:54px;height:54px;border-radius:50%;background:var(--ai-grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;flex-shrink:0;
}
.me-stats{
  display:flex;background:var(--bg-card);border:1px solid var(--border);border-radius:16px;overflow:hidden;margin-bottom:16px;
}
.me-stats .ms{flex:1;text-align:center;padding:16px 0;}
.me-stats .ms + .ms{border-left:1px solid var(--border);}
.me-stats .ms-val{font-size:20px;font-weight:700;}
.me-stats .ms-label{font-size:12px;color:var(--text-secondary);margin-top:3px;}
.mk-item{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.mk-item .mk-name{width:100px;font-size:13px;flex-shrink:0;color:var(--text-secondary);}
.mk-item .mk-bar{flex:1;}
.mk-item .mk-pct{width:72px;text-align:right;font-size:12px;font-weight:600;flex-shrink:0;}
.menu-list{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;overflow:hidden;}
.menu-list a,.menu-list button{
  display:flex;align-items:center;gap:12px;padding:14px 16px;width:100%;border:none;background:none;
  border-bottom:1px solid var(--border);color:var(--text-primary);font-size:14px;text-align:left;cursor:pointer;
}
.menu-list a:last-child,.menu-list button:last-child{border-bottom:none;}
.menu-list a:hover,.menu-list button:hover{background:var(--primary-50);}
.menu-list .arrow{margin-left:auto;color:var(--text-tertiary);display:inline-flex;}
.menu-list .svg-icon{color:var(--text-secondary);}

.badge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;}
.badge-item{
  background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:14px 8px;text-align:center;
}
.badge-item.locked{opacity:.45;filter:grayscale(1);}
.badge-item .b-icon{margin-bottom:6px;color:var(--warning);display:flex;align-items:center;justify-content:center;}
.badge-item .b-name{font-size:12px;font-weight:600;}
.badge-item .b-desc{font-size:11px;color:var(--text-tertiary);margin-top:2px;}

/* 结果页 */
.result-hero{text-align:center;padding:32px 16px;}
.result-hero .score{font-size:48px;font-weight:700;color:var(--primary-600);}
.result-hero .score-label{font-size:14px;color:var(--text-secondary);margin-top:4px;}
.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0;}
.result-stats .rs{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:14px;text-align:center;}
.result-stats .rs-val{font-size:20px;font-weight:700;}
.result-stats .rs-label{font-size:12px;color:var(--text-secondary);margin-top:2px;}

/* 模态 */
.modal-mask{
  position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:100;display:none;
  align-items:center;justify-content:center;padding:20px;
}
.modal-mask.show{display:flex;}
.modal{
  background:var(--bg-card);border-radius:16px;width:100%;max-width:400px;max-height:80vh;overflow:auto;
  padding:20px;box-shadow:0 20px 50px rgba(0,0,0,.2);
}
.modal h3{font-size:16px;margin-bottom:14px;}
.subject-option{
  display:block;width:100%;text-align:left;padding:12px 14px;border:1px solid var(--border);
  border-radius:10px;background:var(--bg-card);margin-bottom:8px;cursor:pointer;
}
.subject-option:hover,.subject-option.active{border-color:var(--primary-600);background:var(--primary-50);color:var(--primary-600);}

/* H5 内容边距 */
.h5-pad{padding:0 16px 24px;}
.loading{text-align:center;padding:40px;color:var(--text-tertiary);font-size:14px;}
.combo-tip{
  position:fixed;bottom:80px;left:50%;transform:translateX(-50%);
  background:var(--success);color:#fff;padding:6px 14px;border-radius:99px;font-size:13px;font-weight:600;
  opacity:0;transition:opacity .3s;z-index:50;pointer-events:none;
}
.combo-tip.show{opacity:1;}

/* 工具类 */
.hide-h5{display:none;}
@media (min-width:900px){
  .hide-h5{display:block;}
  .only-h5{display:none !important;}
}
@media (max-width:899px){
  .hide-h5{display:none !important;}
}

/* 排行榜 */
.rank-row{
  display:flex;align-items:center;gap:12px;padding:12px 14px;
  background:var(--bg-card);border:1px solid var(--border);border-radius:12px;margin-bottom:8px;
}
.rank-row.me{border-color:var(--primary-600);background:var(--primary-50);}
.rank-num{width:28px;font-weight:700;color:var(--text-tertiary);text-align:center;}
.rank-num.top{color:var(--warning);}
.rank-name{flex:1;font-weight:600;}
.rank-score{font-weight:700;color:var(--primary-600);}

/* 搜索结果在 modal 内可滚动 */
#search-modal .modal{max-height:85vh;}
#search-modal-result{max-height:55vh;overflow-y:auto;}