/* ===== 设计变量 ===== */
:root{
  --bg:#f6f6f4;
  --ink:#111111;
  --muted:#585858;
  --line:#d9d9d4;
  --card:#ffffff;
  --danger:#b3261e;
  --success:#1a7f37;
  --radius-sm:12px;
  --radius-md:20px;
  --radius-lg:28px;
  --radius-xl:34px;
  --shadow-card:0 18px 40px rgba(17,17,17,.05);
  --shadow-hover:0 26px 46px rgba(17,17,17,.09);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:linear-gradient(180deg,#fafaf8,#f1f1ee);
  line-height:1.6;
  min-height:100vh;
  -webkit-tap-highlight-color:transparent;
}
svg{vertical-align:middle}
button{font:inherit}
a{color:inherit}

/* ===== 导航栏 ===== */
.site-nav{position:sticky;top:0;z-index:100;background:rgba(250,250,248,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav-inner{width:min(1280px,calc(100vw - 32px));margin:0 auto;padding:12px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:20px;font-weight:800;letter-spacing:-.02em;color:var(--ink);text-decoration:none;background:none;border:0;cursor:pointer;padding:0}
.logo-dot{width:10px;height:10px;border-radius:50%;background:var(--ink);flex:none}
.nav-right{display:flex;align-items:center;gap:8px}
.link-btn{background:none;border:0;color:var(--muted);font-weight:600;font-size:14px;cursor:pointer;padding:8px 12px;border-radius:999px;text-decoration:none;transition:color .2s,background .2s;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.link-btn:hover{color:var(--ink);background:rgba(17,17,17,.05)}

/* 用户菜单 */
.nav-user-menu{position:relative}
.nav-user-btn{display:inline-flex;align-items:center;gap:8px;background:none;border:0;cursor:pointer;padding:6px 10px;border-radius:999px;transition:background .2s;max-width:220px}
.nav-user-btn:hover{background:rgba(17,17,17,.05)}
.nav-user-avatar{width:28px;height:28px;border-radius:50%;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;flex:none}
.nav-user-name{font-size:14px;font-weight:700;color:var(--ink);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:180px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-md);box-shadow:0 18px 40px rgba(17,17,17,.12);padding:6px;opacity:0;visibility:hidden;transform:translateY(-8px) scale(.96);transform-origin:top right;transition:opacity .18s ease,transform .18s ease,visibility .18s;z-index:200}
.nav-dropdown.open{opacity:1;visibility:visible;transform:translateY(0) scale(1)}
.nav-dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;font-size:14px;font-weight:600;color:var(--ink);cursor:pointer;transition:background .15s;white-space:nowrap}
.nav-dropdown-item:hover{background:var(--bg)}
.nav-dropdown-item:active{transform:scale(.98)}
.nav-dropdown-icon{display:inline-flex;color:var(--muted);transition:color .15s}
.nav-dropdown-item:hover .nav-dropdown-icon{color:var(--ink)}
.nav-dropdown-divider{height:1px;background:var(--line);margin:6px 10px}
.nav-dropdown-item[data-action="logout"]{color:var(--danger)}
.nav-dropdown-item[data-action="logout"] .nav-dropdown-icon{color:var(--danger)}
.nav-dropdown-item[data-action="logout"]:hover{background:rgba(179,38,30,.06)}



/* ===== 通用布局 ===== */
.view{min-height:100vh}
.container{width:min(1280px,calc(100vw - 32px));margin:0 auto}
.page-head{padding:56px 0 8px;text-align:center}
.page-head h1{margin:0 0 10px;font-size:clamp(30px,4.5vw,46px);line-height:1.1;letter-spacing:-.02em}
.page-head p{margin:0 auto;max-width:560px;color:var(--muted);font-size:16px}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 22px;background:var(--ink);color:#fff;font:inherit;font-weight:700;font-size:15px;cursor:pointer;text-decoration:none;transition:opacity .2s,transform .15s,background .2s,border-color .2s}
.btn:hover{opacity:.85}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-lg{padding:16px 36px;font-size:17px}
.btn-sm{padding:8px 16px;font-size:13px}
.btn-block{width:100%}
.btn-secondary{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn-secondary:hover{background:var(--bg);opacity:1}
.btn-danger{background:transparent;color:var(--danger);border:1.5px solid rgba(179,38,30,.4)}
.btn-danger:hover{background:rgba(179,38,30,.06);opacity:1}

/* ===== 徽标 ===== */
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;background:#f1f1ee;color:var(--ink);font-size:12px;font-weight:700;white-space:nowrap}
.badge-accent{background:var(--ink);color:#fff}

/* ===== 表单 ===== */
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--muted);margin-bottom:6px}
.field .hint{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.5}
.input{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--radius-sm);font:inherit;font-size:15px;background:#fff;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.input:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 3px rgba(17,17,17,.06)}
textarea.input{resize:vertical;min-height:96px;line-height:1.6}
select.input{appearance:none;-webkit-appearance:none;cursor:pointer;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23585858' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:40px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
.form-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:4px}

/* ===== 面板 ===== */
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-card);margin-bottom:20px}
.panel-title{margin:0 0 6px;font-size:18px;font-weight:800}
.panel-desc{margin:0 0 18px;color:var(--muted);font-size:14px;line-height:1.7}
.panel-toolbar{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}
.panel-toolbar .panel-desc{margin-bottom:0}

/* ===== 表格 ===== */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.table{width:100%;border-collapse:collapse;font-size:14px;min-width:640px}
.table th{text-align:left;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700;padding:10px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
.table td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:middle}
.table tr:last-child td{border-bottom:0}
.table .row-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.table .cell-main{font-weight:700}
.table .cell-sub{color:var(--muted);font-size:12px;margin-top:2px}
.td-ellipsis{max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.stat-inline{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);font-weight:600}

/* ===== 主页题库卡片 ===== */
.bank-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;padding:32px 0 64px}
.bank-card{width:100%;text-align:left;font:inherit;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-card);cursor:pointer;display:flex;flex-direction:column;gap:14px;transition:transform .2s,border-color .2s,box-shadow .2s}
.bank-card:hover{transform:translateY(-4px);border-color:var(--ink);box-shadow:var(--shadow-hover)}
.bank-card:active{transform:translateY(-1px)}
.bank-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
/* 标题与题型徽标：最左对齐、间距拉大 */
.bank-card-top > div{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.bank-card-title{margin:0;font-size:20px;font-weight:800;letter-spacing:-.01em;line-height:1.3;text-align:left}
.bank-card-desc{margin:0;color:var(--muted);font-size:14px;line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.9em}
.bank-card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto}
.bank-card-count{color:var(--muted);font-size:13px;font-weight:600}
.bank-card-cta{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:700}
.progress-track{height:6px;border-radius:999px;background:#ececea;overflow:hidden}
.progress-fill{height:100%;border-radius:999px;background:var(--ink);transition:width .4s ease}

/* ===== 登录页 ===== */
.auth-wrap{min-height:calc(100vh - 80px);display:flex;align-items:center;justify-content:center;padding:48px 16px}
.auth-card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-xl);padding:36px 32px;box-shadow:var(--shadow-card)}
.auth-title{margin:0 0 6px;font-size:24px;font-weight:800;letter-spacing:-.01em}
.auth-sub{margin:0 0 24px;color:var(--muted);font-size:14px}
.auth-error{margin:0 0 14px;padding:10px 14px;border-radius:var(--radius-sm);background:rgba(179,38,30,.08);color:var(--danger);font-size:13px;font-weight:600;display:none}
.auth-error.show{display:block}

/* ===== 空状态 ===== */
.empty{text-align:center;padding:80px 16px;color:var(--muted)}
.empty-icon{width:56px;height:56px;border-radius:18px;background:var(--card);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;margin:0 auto 18px;color:var(--muted)}
.empty h3{margin:0 0 6px;font-size:18px;color:var(--ink)}
.empty p{margin:0 0 22px;font-size:14px}

/* ===== 管理后台 ===== */
.admin-wrap{padding:32px 0 64px}
.admin-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:24px;overflow-x:auto;scrollbar-width:none}
.admin-tabs::-webkit-scrollbar{display:none}
.admin-tab{background:none;border:0;border-bottom:2px solid transparent;padding:12px 18px;font:inherit;font-weight:700;font-size:15px;color:var(--muted);cursor:pointer;white-space:nowrap;transition:color .2s,border-color .2s}
.admin-tab:hover{color:var(--ink)}
.admin-tab.active{color:var(--ink);border-bottom-color:var(--ink)}
.batch-result{margin-top:16px}
.result-line{display:flex;align-items:flex-start;gap:8px;font-size:13px;padding:6px 10px;border-radius:10px;line-height:1.5}
.result-line.success{color:var(--success)}
.result-line.error{color:var(--danger)}

/* ===== 弹窗 ===== */
.modal-mask{position:fixed;inset:0;z-index:200;background:rgba(17,17,17,.5);display:flex;align-items:flex-end;justify-content:center;animation:fade-in .2s ease}
.modal{width:100%;max-width:600px;max-height:92vh;overflow-y:auto;background:#fff;border-radius:28px 28px 0 0;padding:28px;animation:modal-in .25s ease}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px}
.modal-title{margin:0;font-size:20px;font-weight:800}
.modal-close{background:none;border:0;cursor:pointer;color:var(--muted);padding:6px;border-radius:10px;display:inline-flex}
.modal-close:hover{color:var(--ink);background:var(--bg)}
.modal-foot{display:flex;justify-content:flex-end;gap:24px !important;flex-wrap:wrap;margin-top:8px}
@media(min-width:640px){
  .modal{border-radius:var(--radius-xl);margin:24px}
  .modal-mask{align-items:center}
}

/* ===== Toast ===== */
.toast-root{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);z-index:300;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none;width:100%;padding:0 16px}
.toast{display:flex;align-items:center;gap:8px;background:var(--ink);color:#fff;padding:12px 20px;border-radius:999px;font-size:14px;font-weight:600;box-shadow:0 12px 30px rgba(17,17,17,.25);animation:toast-in .25s ease;max-width:100%;transition:opacity .25s ease,transform .25s ease}
.toast svg{flex:none}
.toast.success svg{color:#57d98c}
.toast.error svg{color:#ff8a80}
.toast.info svg{color:#cfcfcf}

/* ===== 答题页 ===== */
.quiz-mode .site-nav{display:none}
.quiz-page{min-height:100vh;display:flex;flex-direction:column}
.quiz-topbar{position:sticky;top:0;z-index:100;background:rgba(250,250,248,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.quiz-topbar-inner{width:min(760px,calc(100vw - 32px));margin:0 auto;padding:10px 0;display:flex;align-items:center;gap:10px;position:relative}
.quiz-exit{display:inline-flex;align-items:center;gap:6px;background:none;border:0;color:var(--muted);font-weight:700;font-size:14px;cursor:pointer;padding:8px 12px;border-radius:999px;transition:color .2s,background .2s}
.quiz-exit:hover{color:var(--ink);background:rgba(17,17,17,.05)}
/* 顶部题库名称：绝对居中 + 放大 */
.quiz-title{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);font-size:17px;font-weight:800;color:var(--ink);text-align:center;max-width:55%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.quiz-stage{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:36px 16px 56px;gap:30px;width:100%}
/* 卡片上方进度 */
.quiz-stage-progress{font-size:13px;font-weight:700;color:var(--muted);letter-spacing:.06em}
.quiz-card{width:min(640px,100%);min-height:280px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);padding:44px 32px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;animation:card-in .25s ease;position:relative}
.quiz-card-label{font-size:12px;font-weight:800;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.quiz-card-text{font-size:clamp(20px,4.5vw,30px);font-weight:700;line-height:1.5;word-break:break-word;white-space:pre-wrap;max-width:100%}
/* 答案区域与「查看答案」小字 */
.quiz-card-answer{width:100%;margin-top:16px;padding:14px 16px;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-sm);font-size:15px;line-height:1.7;color:var(--ink);text-align:left;white-space:pre-wrap;word-break:break-word}
.quiz-answer-toggle{position:absolute;right:16px;bottom:14px;background:none;border:0;color:var(--muted);font-size:12px;font-weight:700;cursor:pointer;padding:6px 10px;border-radius:8px;transition:color .2s,background .2s}
.quiz-answer-toggle:hover{color:var(--ink);background:var(--bg)}
.quiz-actions{display:grid;grid-template-columns:1fr 1fr;gap:14px;width:min(640px,100%)}
.quiz-action{min-height:62px;border-radius:20px;font-size:18px;font-weight:800;border:0;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:transform .15s,opacity .2s,background .2s,border-color .2s}
.quiz-action:disabled{opacity:.5;cursor:wait}
.quiz-action:active{transform:scale(.98)}
.quiz-know{background:var(--ink);color:#fff}
.quiz-know:hover{opacity:.88}
.quiz-dont{background:#fff;color:var(--ink);border:1.5px solid var(--line)}
.quiz-dont:hover{background:var(--bg);border-color:var(--ink)}
.quiz-done{text-align:center;display:flex;flex-direction:column;align-items:center;gap:14px;animation:card-in .3s ease}
.quiz-done-icon{width:72px;height:72px;border-radius:50%;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.quiz-done h2{margin:0;font-size:clamp(26px,5vw,34px);letter-spacing:-.02em}
.quiz-done p{margin:0;color:var(--muted);font-size:15px}

/* ===== 动画 ===== */
@keyframes fade-in{from{opacity:0}to{opacity:1}}
@keyframes modal-in{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes card-in{from{opacity:0;transform:translateY(10px) scale(.98)}to{opacity:1;transform:none}}
@keyframes toast-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* ===== 响应式 ===== */
@media (max-width: 640px){
  .nav-user{max-width:100px}
  .page-head{padding:40px 0 0}
  .panel{padding:20px}
  .table{min-width:560px}
  .quiz-card{min-height:220px;padding:32px 20px}
  .quiz-actions{grid-template-columns:1fr 1fr;gap:10px}
}
@media (prefers-reduced-motion: reduce){
  *{scroll-behavior:auto;transition:none!important;animation:none!important}
}


/* ===== 主页横向菜单 ===== */
.section-tabs{display:flex;gap:8px;justify-content:center;margin:24px auto 0;max-width:400px;padding:0 16px}
.section-tab{flex:1;padding:12px 0;border:1.5px solid var(--line);border-radius:999px;background:var(--card);color:var(--muted);font:inherit;font-weight:700;font-size:15px;cursor:pointer;transition:background .2s,color .2s,border-color .2s;text-align:center}
.section-tab:hover{border-color:var(--ink);color:var(--ink)}
.section-tab.active{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ===== 云剪贴板 ===== */
.clipboard-toolbar{display:flex;justify-content:flex-start;margin-bottom:24px}
.clipboard-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;padding-bottom:64px}
.clipboard-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:12px}
.clipboard-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.clipboard-card-title{margin:0;font-size:18px;font-weight:800}
.clipboard-card-desc{margin:0;color:var(--muted);font-size:13px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.7em}
.clipboard-card-count{font-size:13px;color:var(--muted);font-weight:600}
.clipboard-card-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto}
.clipboard-card-actions .btn{flex:1;min-width:70px}

/* 剪贴板详情 */
.clipboard-detail-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:32px 0 8px}
.clipboard-detail-info{flex:1;min-width:200px}
.clipboard-detail-info h1{margin:0 0 6px;font-size:24px}
.clipboard-detail-info p{margin:0 0 10px;color:var(--muted)}
.clipboard-detail-info .badge{margin-bottom:8px}

/* 剪贴板条目 */
.clipboard-items{display:flex;flex-direction:column;gap:12px;padding-bottom:64px}
.clipboard-item{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-md);padding:18px 20px;box-shadow:var(--shadow-card)}
.clipboard-item-content{flex:1;font-size:15px;line-height:1.7;white-space:pre-wrap;word-break:break-word}
.clipboard-item-delete{flex:none}

/* 分享链接框 */
.share-url-box{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;font-size:13px;word-break:break-all;color:var(--muted);margin-bottom:4px}