/* ============================================
   视频推广答题系统 - 自定义样式 v2.0
   基于Tailwind CSS扩展
   ============================================ */

:root {
    --primary: #007AFF; --primary-dark: #0051D5; --primary-light: #4DA3FF;
    --primary-50: #E6F2FF; --primary-100: #CCE5FF;
    --success: #34C759; --success-dark: #28A745; --success-50: #E8F9ED;
    --warning: #FF9500; --warning-dark: #E08600; --warning-50: #FFF4E6;
    --danger: #FF3B30; --danger-dark: #D63029; --danger-50: #FFEBEA;
    --info: #5AC8FA; --info-dark: #4A9FD9; --info-50: #EBF7FD;
    --gray-50: #f2f2f7; --gray-100: #e5e5ea; --gray-200: #d1d1d6;
    --gray-300: #c7c7cc; --gray-400: #aeaeb2; --gray-500: #8e8e93;
    --gray-600: #636366; --gray-700: #48484a; --gray-800: #3a3a3c;
    --gray-900: #1c1c1e;
}
*{box-sizing:border-box}
html,body{overflow-x:hidden;width:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--gray-50);color:var(--gray-800);margin:0;line-height:1.6}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:rgba(255,255,255,0.1)}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.3);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,0.5)}

/* ===== 布局 ===== */
.app-layout{display:flex;min-height:100vh}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:99}
.sidebar-overlay.active{display:block}
.sidebar{width:260px;height:100vh;position:fixed;left:0;top:0;z-index:100;transition:transform .3s cubic-bezier(.4,0,.2,1);overflow:hidden;background:#1c1c1e;border-right:1px solid #2c2c2e;display:flex;flex-direction:column}
.sidebar.collapsed{transform:translateX(-260px)}
.sidebar.mobile-open{transform:translateX(0)}
.menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px;border-radius:8px;transition:background .15s}
.menu-btn:hover{background:var(--gray-100)}
@media(max-width:768px){.menu-btn{display:flex}}
.main-content{flex:1;margin-left:260px;transition:margin-left .3s ease;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}
.main-content.expanded{margin-left:0}
.content-area{padding:28px;max-width:1440px;margin:0 auto;width:100%;overflow-x:hidden}
@media(max-width:768px){
    .sidebar{transform:translateX(-260px)}
    .main-content{margin-left:0}
    .content-area{padding:16px}
}

/* ===== 侧边栏 ===== */
.sidebar-brand{padding:22px 24px;font-size:17px;font-weight:700;color:#fff;display:flex;align-items:center;gap:12px;border-bottom:1px solid #2c2c2e;flex-shrink:0}
.sidebar-brand .brand-icon{width:36px;height:36px;border-radius:10px;background:var(--primary);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.sidebar-nav{flex:1;overflow-y:auto;overflow-x:hidden;padding:16px 0;min-height:0}
.sidebar-nav .nav-section-title{padding:20px 24px 8px;font-size:11px;color:rgba(255,255,255,.35);text-transform:uppercase;letter-spacing:1.5px;font-weight:600}
.sidebar-nav .nav-item{display:flex;align-items:center;gap:12px;padding:11px 16px 11px 24px;color:rgba(255,255,255,.7);text-decoration:none;transition:all .15s;border-radius:10px;margin:2px 12px;font-size:14px;font-weight:500}
.sidebar-nav .nav-item:hover{color:#fff;background:rgba(255,255,255,.08)}
.sidebar-nav .nav-item.active{color:#fff;background:var(--primary);box-shadow:0 2px 8px rgba(0,122,255,.35)}
.sidebar-nav .nav-item .nav-icon{width:20px;height:20px;text-align:center;flex-shrink:0;display:flex;align-items:center;justify-content:center}

/* ===== 顶部栏 ===== */
.topbar{background:#fff;padding:0 28px;height:64px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 1px 3px rgba(0,0,0,.06);position:sticky;top:0;z-index:50;border-bottom:1px solid var(--gray-100)}
.topbar .page-title{font-size:18px;font-weight:700;color:var(--gray-900)}
.topbar .user-info{display:flex;align-items:center;gap:14px}
.topbar .user-avatar{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:600;flex-shrink:0}
.topbar .user-name{font-size:14px;font-weight:600;color:var(--gray-800)}
.topbar .user-role{font-size:12px;color:var(--gray-400)}

/* ===== 卡片 ===== */
.card{background:#fff;border-radius:16px;box-shadow:0 1px 2px rgba(0,0,0,.04);border:1px solid var(--gray-100);overflow:hidden}
.card-header{padding:18px 24px;border-bottom:1px solid var(--gray-100);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;background:#fafafc}
.card-header h3{font-size:15px;font-weight:700;margin:0;color:var(--gray-900);letter-spacing:-.01em}
.card-body{padding:24px}

/* ===== 统计卡片 ===== */
.stat-card{background:#fff;border-radius:16px;padding:20px;box-shadow:0 1px 2px rgba(0,0,0,.04);border:1px solid var(--gray-100);transition:all .15s ease;position:relative;overflow:hidden;display:flex;align-items:center;gap:16px}
.stat-card:hover{box-shadow:0 4px 12px rgba(0,0,0,.06)}
.stat-card .stat-icon{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;flex-shrink:0;background:var(--primary-50);color:var(--primary)}
.stat-card .stat-icon svg{width:24px;height:24px}
.stat-card .stat-content{flex:1;min-width:0}
.stat-card .stat-label{font-size:13px;color:var(--gray-500);margin-bottom:4px;font-weight:500}
.stat-card .stat-value{font-size:26px;font-weight:700;color:var(--gray-900);letter-spacing:-.02em}

/* ===== 表格 ===== */
.card{overflow:hidden}
.table-container{width:100%;overflow-x:auto;overflow-y:hidden;max-width:100%}
.table-container::-webkit-scrollbar{height:6px}
.table-container::-webkit-scrollbar-track{background:transparent}
.table-container::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:3px}
table.data-table{width:100%;min-width:1000px;border-collapse:separate;border-spacing:0}
table.data-table th{padding:12px 16px;text-align:left;font-size:12px;font-weight:600;color:var(--gray-500);letter-spacing:.5px;background:#fafafc;border-bottom:1px solid var(--gray-200);white-space:nowrap}
table.data-table td{padding:13px 16px;font-size:14px;color:var(--gray-700);border-bottom:1px solid var(--gray-100);vertical-align:middle;white-space:nowrap}
table.data-table tr:hover td{background:#f8f9ff}
table.data-table tr:last-child td{border-bottom:none}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;border:none;transition:all .15s;text-decoration:none;white-space:nowrap;line-height:1.4}
.btn:active{opacity:0.75;transform:scale(0.98)}
.btn svg{width:14px;height:14px;flex-shrink:0}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-success{background:var(--success);color:#fff}
.btn-success:hover{background:var(--success-dark)}
.btn-danger{background:var(--danger);color:#fff}
.btn-danger:hover{background:var(--danger-dark)}
.btn-warning{background:var(--warning);color:#fff}
.btn-warning:hover{background:var(--warning-dark)}
.btn-info{background:var(--info);color:#fff}
.btn-info:hover{background:var(--info-dark)}
.btn-outline{background:#fff;border:1px solid var(--gray-300);color:var(--gray-700)}
.btn-outline:hover{background:var(--gray-50);border-color:var(--gray-400)}
.btn-outline-primary{background:#fff;border:1px solid var(--primary);color:var(--primary)}
.btn-outline-primary:hover{background:var(--primary-50)}
.btn-sm{padding:6px 12px;font-size:12px;border-radius:8px}
.btn-sm svg{width:13px;height:13px}
.btn-lg{padding:14px 24px;font-size:16px;border-radius:12px}

/* ===== 表单 ===== */
.form-group{margin-bottom:20px}
.form-label{display:block;font-size:14px;font-weight:600;color:var(--gray-700);margin-bottom:6px}
.form-input,.form-select,.form-textarea{width:100%;padding:10px 14px;border:1.5px solid var(--gray-300);border-radius:10px;font-size:14px;color:var(--gray-800);background:#fff;transition:border-color .2s,box-shadow .2s;outline:none;font-family:inherit}
.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,122,255,.1)}
.form-textarea{min-height:100px;resize:vertical;line-height:1.6}
.form-hint{font-size:12px;color:var(--gray-400);margin-top:5px}
.form-error{font-size:12px;color:var(--danger);margin-top:5px}

/* ===== 徽章 ===== */
.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:6px;font-size:12px;font-weight:600}
.badge-success{background:var(--success-50);color:var(--success-dark)}
.badge-danger{background:var(--danger-50);color:var(--danger-dark)}
.badge-warning{background:var(--warning-50);color:var(--warning-dark)}
.badge-info{background:var(--info-50);color:var(--info-dark)}
.badge-gray{background:var(--gray-100);color:var(--gray-600)}
.badge-primary{background:var(--primary-50);color:var(--primary-dark)}

/* ===== 搜索栏 ===== */
.search-bar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.search-bar .form-input,.search-bar .form-select{width:auto;min-width:160px}

/* ===== 分页 ===== */
.pagination-nav{display:flex;align-items:center;justify-content:space-between;margin-top:20px;flex-wrap:wrap;gap:12px}
.pagination{display:flex;list-style:none;padding:0;margin:0;gap:4px}
.pagination li a,.pagination li span{display:inline-flex;align-items:center;justify-content:center;min-width:36px;height:36px;padding:0 8px;border-radius:8px;font-size:14px;text-decoration:none;border:1px solid var(--gray-200);color:var(--gray-600);cursor:pointer;transition:all .2s}
.pagination li a:hover{background:var(--gray-50)}
.pagination li.active span{background:var(--primary);color:#fff;border-color:var(--primary)}
.pagination li.disabled span{color:var(--gray-300);cursor:not-allowed}

/* ===== 空状态 ===== */
.empty-state{text-align:center;padding:60px 20px;color:var(--gray-400)}
.empty-state .empty-icon{font-size:48px;margin-bottom:16px}
.empty-state .empty-text{font-size:15px}

/* ===== 弹窗 ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:1000;backdrop-filter:blur(4px);animation:fadeInOverlay .2s ease}
@keyframes fadeInOverlay{from{opacity:0}to{opacity:1}}
.modal{background:#fff;border-radius:14px;max-width:600px;width:90%;max-height:90vh;overflow:auto;animation:slideUp .3s cubic-bezier(.4,0,.2,1);box-shadow:0 10px 30px rgba(0,0,0,.15)}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-header{padding:20px 24px;border-bottom:1px solid var(--gray-100);display:flex;align-items:center;justify-content:space-between}
.modal-header h3{font-size:18px;font-weight:700;margin:0}
.modal-body{padding:24px}
.modal-footer{padding:16px 24px;border-top:1px solid var(--gray-100);display:flex;justify-content:flex-end;gap:8px}
.modal-close{background:none;border:none;font-size:20px;cursor:pointer;color:var(--gray-400);padding:4px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:6px;transition:all .2s}
.modal-close:hover{background:var(--gray-100);color:var(--gray-600)}

/* ===== Toast ===== */
.toast{position:fixed;top:24px;right:24px;padding:14px 22px;border-radius:10px;color:#fff;font-size:14px;font-weight:500;z-index:2000;display:flex;align-items:center;gap:8px;animation:slideInRight .3s cubic-bezier(.4,0,.2,1);box-shadow:0 8px 20px rgba(0,0,0,.15);max-width:360px}
.toast-success{background:var(--success)}
.toast-error{background:var(--danger)}
.toast-info{background:var(--info)}
.toast-warning{background:var(--warning)}
@keyframes slideInRight{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}

/* ===== 进度条 ===== */
.progress-bar-container{background:var(--gray-200);border-radius:12px;height:8px;overflow:hidden}
.progress-bar-fill{height:100%;border-radius:12px;transition:width .5s cubic-bezier(.4,0,.2,1)}
.progress-bar-fill.progress-success{background:linear-gradient(90deg,#34d399,#10b981)}
.progress-bar-fill.progress-warning{background:linear-gradient(90deg,#fbbf24,#f59e0b)}
.progress-bar-fill.progress-danger{background:linear-gradient(90deg,#f87171,#ef4444)}
.progress-bar-fill.progress-info{background:linear-gradient(90deg,#60a5fa,#3b82f6)}

/* ===== 登录页 ===== */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2)}
.login-card{background:#fff;border-radius:20px;box-shadow:0 25px 60px rgba(0,0,0,.2);padding:48px 40px;width:420px;max-width:92%;animation:loginSlideUp .5s cubic-bezier(.4,0,.2,1)}
@keyframes loginSlideUp{from{transform:translateY(30px);opacity:0}to{transform:translateY(0);opacity:1}}
.login-logo{text-align:center;margin-bottom:36px}
.login-logo .logo-icon{width:68px;height:68px;border-radius:18px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));display:inline-flex;align-items:center;justify-content:center;font-size:34px;color:#fff;margin-bottom:18px;box-shadow:0 8px 20px rgba(99,102,241,.3)}
.login-logo h1{font-size:24px;font-weight:800;color:var(--gray-900);margin:0 0 6px;letter-spacing:-.02em}
.login-logo p{font-size:14px;color:var(--gray-400);margin:0}

/* ===== 学员端 ===== */
.student-page{min-height:100vh;background:linear-gradient(180deg,#0f0b2e,#1a1640)}
.student-video-container{max-width:960px;margin:0 auto;padding:20px}
.student-video-wrapper{background:#000;border-radius:14px;overflow:hidden;position:relative;box-shadow:0 8px 30px rgba(0,0,0,.4)}
.student-video-wrapper video{width:100%;display:block}
.student-progress-overlay{position:absolute;top:12px;right:12px;background:rgba(0,0,0,.7);color:#fff;padding:6px 14px;border-radius:20px;font-size:13px;font-weight:500;backdrop-filter:blur(4px)}
.student-quiz-section{margin-top:24px}
.student-question-card{background:#fff;border-radius:14px;padding:24px;margin-bottom:16px;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.student-question-card .q-title{font-size:16px;font-weight:700;color:var(--gray-900);margin-bottom:16px;line-height:1.5}
.student-question-card .q-option{display:flex;align-items:center;gap:12px;padding:13px 16px;border:2px solid var(--gray-200);border-radius:10px;margin-bottom:8px;cursor:pointer;transition:all .2s;font-size:14px}
.student-question-card .q-option:hover{border-color:var(--primary-light);background:var(--primary-50)}
.student-question-card .q-option.selected{border-color:var(--primary);background:var(--primary-50)}
.student-question-card .q-option .q-option-label{width:30px;height:30px;border-radius:8px;background:var(--gray-100);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--gray-600);flex-shrink:0;transition:all .2s}
.student-question-card .q-option.selected .q-option-label{background:var(--primary);color:#fff}
.student-question-card .q-option.correct{border-color:var(--success);background:var(--success-50)}
.student-question-card .q-option.correct .q-option-label{background:var(--success);color:#fff}
.student-question-card .q-option.wrong{border-color:var(--danger);background:var(--danger-50)}
.student-question-card .q-option.wrong .q-option-label{background:var(--danger);color:#fff}

/* ===== 响应式 ===== */
@media(max-width:768px){
    .content-area{padding:16px}
    .stat-card{padding:16px}
    .stat-card .stat-value{font-size:22px}
    .topbar{padding:0 16px}
    .login-card{padding:32px 24px}
    table.data-table th,table.data-table td{padding:10px 12px;font-size:13px}
    .btn{padding:8px 14px;font-size:13px}
}
@media(max-width:480px){
    .stat-card .stat-value{font-size:20px}
    .stat-card .stat-icon{width:40px;height:40px;font-size:18px}
}

/* ===== 过渡动画 ===== */
.fade-in{animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* ===== 标签页 ===== */
.tabs{display:flex;gap:4px;border-bottom:2px solid var(--gray-200);margin-bottom:24px}
.tab-item{padding:10px 20px;font-size:14px;font-weight:500;color:var(--gray-500);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:all .2s}
.tab-item:hover{color:var(--gray-700)}
.tab-item.active{color:var(--primary);border-bottom-color:var(--primary)}

/* ===== 选项编辑器 ===== */
.option-editor-item{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.option-editor-item .option-letter{width:32px;height:32px;border-radius:8px;background:var(--gray-100);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--gray-600);flex-shrink:0;transition:all .2s}
.option-editor-item.is-correct .option-letter{background:var(--success);color:#fff}

/* ===== 信息提示框 ===== */
.info-box{padding:16px 20px;border-radius:10px;font-size:14px;line-height:1.7;display:flex;align-items:flex-start;gap:12px}
.info-box-primary{background:var(--primary-50);color:var(--primary-dark);border:1px solid var(--primary-100)}
.info-box-success{background:var(--success-50);color:var(--success-dark);border:1px solid #a7f3d0}
.info-box-warning{background:var(--warning-50);color:var(--warning-dark);border:1px solid #fde68a}
.info-box-danger{background:var(--danger-50);color:var(--danger-dark);border:1px solid #fecaca}

/* ===== 数据网格 ===== */
.data-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.data-grid-item .label{font-size:13px;color:var(--gray-400);margin-bottom:4px;font-weight:500}
.data-grid-item .value{font-size:15px;font-weight:600;color:var(--gray-800);word-break:break-all}

/* ===== 面包屑 ===== */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--gray-400);margin-bottom:20px}
.breadcrumb a{color:var(--gray-500);text-decoration:none;transition:all .2s}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .separator{color:var(--gray-300)}

/* ===== 复选框美化 ===== */
input[type="checkbox"],input[type="radio"]{accent-color:var(--primary);width:16px;height:16px}