/* ========== 设计变量 ========== */
:root {
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #4338ca;
  --gradient: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #0f172a;
  --text-sec: #64748b;
  --text-thi: #94a3b8;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.08), 0 3px 10px rgba(0,0,0,0.04);
  --sidebar-w: 240px;
  --transition: 0.2s ease;
}

/* ========== 重置 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }

/* ========== 侧边栏 ========== */
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0; width: var(--sidebar-w);
  background: #fff; border-right: 1px solid var(--border);
  display: flex; flex-direction: column; z-index: 100;
  transition: transform 0.3s ease;
}
.sidebar-header {
  display: flex; align-items: center; gap: 10px;
  padding: 20px 18px; border-bottom: 1px solid var(--border);
}
.logo-icon { width: 34px; height: 34px; flex-shrink: 0; }
.logo-text { font-size: 16px; font-weight: 700; color: var(--text); display: flex; align-items: baseline; gap: 5px; }
.logo-brand { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; letter-spacing: 1px; }
.logo-sub { font-size: 12px; font-weight: 500; color: var(--text-thi); letter-spacing: 0.5px; }
.sidebar-nav { flex: 1; padding: 12px 10px; overflow-y: auto; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  color: var(--text-sec); cursor: pointer; text-decoration: none;
  font-size: 14px; font-weight: 500; transition: var(--transition);
  margin-bottom: 4px;
}
.nav-item svg { width: 20px; height: 20px; flex-shrink: 0; }
.nav-item:hover { background: #f1f5f9; color: var(--text); }
.nav-item.active { background: var(--gradient); color: #fff; }
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); }
.data-status { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-thi); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-thi); }
.status-dot.active { background: var(--success); box-shadow: 0 0 6px rgba(16,185,129,0.4); }

/* ========== 主内容区 ========== */
.main-content { margin-left: var(--sidebar-w); min-height: 100vh; padding: 24px 32px; }

/* ========== 页面 ========== */
.page { display: none; }
.page.active { display: block; }
.page-header { margin-bottom: 24px; }
.page-header h1 { font-size: 22px; font-weight: 700; }
.page-desc { font-size: 14px; color: var(--text-sec); margin-top: 4px; }

/* ========== 空状态 ========== */
.empty-state {
  text-align: center; padding: 60px 20px;
  color: var(--text-thi);
}
.empty-state h3 { font-size: 18px; margin: 16px 0 8px; color: var(--text-sec); }
.empty-state p { font-size: 14px; margin-bottom: 20px; }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: none; transition: var(--transition); text-decoration: none;
}
.btn-primary { background: var(--gradient); color: #fff; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--text-sec); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ========== KPI卡片 ========== */
.kpi-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-bottom: 24px;
}
.kpi-card {
  background: var(--card-bg); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
  border: 1px solid var(--border); position: relative; overflow: hidden;
}
.kpi-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient);
}
.kpi-icon { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; margin-bottom: 12px; }
.kpi-icon svg { width: 20px; height: 20px; }
.kpi-value { font-size: 28px; font-weight: 800; color: var(--text); }
.kpi-label { font-size: 13px; color: var(--text-sec); margin-top: 4px; }
.kpi-trend { font-size: 12px; margin-top: 8px; display: flex; align-items: center; gap: 4px; }
.kpi-trend.up { color: var(--success); }
.kpi-trend.down { color: var(--danger); }

/* ========== 图表卡片 ========== */
.chart-row { display: flex; gap: 16px; margin-bottom: 16px; }
.chart-card {
  background: var(--card-bg); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); border: 1px solid var(--border);
  flex: 1; min-width: 0;
}
.chart-wide { flex: 2; }
.chart-title { font-size: 15px; font-weight: 600; margin-bottom: 16px; color: var(--text); }
.chart-container { width: 100%; height: 220px; }
.chart-container.large { height: 300px; }
.chart-container svg { width: 100%; height: 100%; }

/* ========== 上传区 ========== */
.upload-zone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 48px 20px; text-align: center; cursor: pointer;
  transition: var(--transition); background: var(--card-bg);
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary); background: #f5f3ff;
}
.upload-zone h3 { font-size: 16px; margin: 12px 0 4px; color: var(--text); }
.upload-zone p { font-size: 13px; color: var(--text-thi); }

/* ========== 云端加载区 ========== */
.cloud-load-section { margin-top: 20px; }
.cloud-load-divider { display: flex; align-items: center; margin: 16px 0; color: var(--text-thi); font-size: 13px; }
.cloud-load-divider::before, .cloud-load-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.cloud-load-divider span { padding: 0 12px; }
.cloud-load-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.cloud-load-card input:focus { border-color: var(--primary); }
#cloud-status.success { color: var(--success); }
#cloud-status.error { color: var(--danger); }
#cloud-status.loading { color: var(--primary); }
.batch-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  margin-bottom: 8px; background: #f8fafc; cursor: pointer; transition: var(--transition);
}
.batch-item:hover { border-color: var(--primary); background: #f5f3ff; }
.batch-item-info { font-size: 13px; }
.batch-item-info strong { color: var(--text); }
.batch-item-info span { color: var(--text-thi); margin-left: 8px; }
.batch-item-meta { font-size: 12px; color: var(--text-thi); }

/* ========== 进度条 ========== */
.progress-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin: 20px 0 8px; }
.progress-fill { height: 100%; background: var(--gradient); transition: width 0.3s ease; width: 0%; }
.progress-text { font-size: 13px; color: var(--text-sec); text-align: center; }

/* ========== 导入结果 ========== */
.import-summary {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px; margin: 20px 0;
}
.summary-card {
  background: var(--card-bg); border-radius: var(--radius-sm);
  padding: 16px; border: 1px solid var(--border); text-align: center;
}
.summary-card .num { font-size: 24px; font-weight: 700; color: var(--primary); }
.summary-card .label { font-size: 13px; color: var(--text-sec); margin-top: 4px; }

/* ========== 数据表格 ========== */
.data-table-wrapper { background: var(--card-bg); border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); margin-top: 16px; }
.data-table-wrapper h3 { font-size: 15px; font-weight: 600; margin-bottom: 12px; }
.table-filters { display: flex; gap: 12px; margin-bottom: 12px; }
.table-filters select, .table-filters input {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: 13px; outline: none; transition: var(--transition);
}
.table-filters select:focus, .table-filters input:focus { border-color: var(--primary); }
.data-table-scroll { overflow-x: auto; max-height: 400px; overflow-y: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { background: #f8fafc; padding: 10px 12px; text-align: left; font-weight: 600; color: var(--text-sec); border-bottom: 1px solid var(--border); white-space: nowrap; position: sticky; top: 0; }
.data-table td { padding: 8px 12px; border-bottom: 1px solid var(--border); color: var(--text); max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.data-table tr:hover { background: #f8fafc; }
.import-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 20px; }

/* ========== 情感样本 ========== */
.sentiment-samples { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.sample-card { padding: 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); font-size: 13px; }
.sample-card.positive { border-left: 3px solid var(--success); background: #f0fdf4; }
.sample-card.negative { border-left: 3px solid var(--danger); background: #fef2f2; }
.sample-card.neutral { border-left: 3px solid var(--text-thi); background: #f8fafc; }
.sample-card .tag { font-size: 12px; font-weight: 600; margin-bottom: 6px; }
.sample-card.positive .tag { color: var(--success); }
.sample-card.negative .tag { color: var(--danger); }
.sample-card.neutral .tag { color: var(--text-thi); }
.sample-card .content { color: var(--text-sec); line-height: 1.5; }
.tag-mini { display: inline-block; padding: 1px 6px; border-radius: 4px; font-size: 11px; font-weight: 500; margin-left: 4px; }

/* ========== 登录/注册遮罩 ========== */
.auth-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.auth-card {
  background: #fff; border-radius: 16px; padding: 32px;
  max-width: 400px; width: 100%;
  box-shadow: 0 20px 60px rgba(79, 70, 229, 0.15), 0 0 0 1px rgba(0,0,0,0.04);
}
.auth-header { text-align: center; margin-bottom: 24px; }
.auth-logo { width: 48px; height: 48px; margin-bottom: 12px; }
.auth-header h2 {
  margin: 0; font-size: 20px; font-weight: 700; color: #0f172a;
}
.auth-tabs {
  display: flex; gap: 4px; background: #f1f5f9; border-radius: 10px;
  padding: 4px; margin-bottom: 20px;
}
.auth-tab {
  flex: 1; padding: 8px 12px; border: none; background: transparent;
  border-radius: 8px; font-size: 14px; font-weight: 500; color: #64748b;
  cursor: pointer; transition: all 0.2s;
}
.auth-tab.active { background: #fff; color: #4f46e5; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-form .form-group { display: flex; flex-direction: column; gap: 6px; }
.auth-form .form-group label { font-size: 13px; font-weight: 600; color: #334155; }
.auth-form .form-group input {
  padding: 10px 14px; border: 1.5px solid #e2e8f0; border-radius: 10px;
  font-size: 14px; outline: none; transition: border-color 0.2s;
}
.auth-form .form-group input:focus { border-color: #4f46e5; box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.auth-submit {
  margin-top: 4px; padding: 11px; font-size: 15px; font-weight: 600;
  background: linear-gradient(135deg, #4f46e5, #9333ea); color: #fff;
  border: none; border-radius: 10px; cursor: pointer; transition: opacity 0.2s;
}
.auth-submit:hover { opacity: 0.92; }
.auth-submit:disabled { opacity: 0.6; cursor: not-allowed; }
.auth-message {
  margin-top: 12px; padding: 10px 14px; border-radius: 8px;
  font-size: 13px; text-align: center;
}
.auth-message-error { background: #fef2f2; color: #dc2626; }
.auth-message-success { background: #f0fdf4; color: #16a34a; }
.auth-hint { margin-top: 16px; text-align: center; font-size: 12px; color: #94a3b8; }

/* ========== 侧边栏用户信息 ========== */
.user-info {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; margin-top: 8px;
  background: #f8fafc; border-radius: 10px;
}
.user-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, #4f46e5, #9333ea);
  color: #fff; font-size: 14px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.user-detail { flex: 1; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.user-account {
  font-size: 13px; font-weight: 600; color: #0f172a;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.user-license { font-size: 11px; color: #64748b; }
.btn-logout {
  width: 28px; height: 28px; border: none; background: transparent;
  color: #94a3b8; border-radius: 6px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.btn-logout:hover { background: #fee2e2; color: #dc2626; }
.btn-logout svg { width: 16px; height: 16px; }

/* ========== 词云 ========== */
.word-cloud-item { display: inline-block; margin: 4px 8px; transition: var(--transition); cursor: default; }
.word-cloud-item:hover { transform: scale(1.1); }

/* ========== 移动端 ========== */
.mobile-menu-btn { display: none; position: fixed; top: 16px; left: 16px; z-index: 101; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm); width: 40px; height: 40px; align-items: center; justify-content: center; cursor: pointer; color: var(--text-sec); }
.mobile-menu-btn svg { width: 22px; height: 22px; }
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; padding: 16px; padding-top: 64px; }
  .mobile-menu-btn { display: flex; }
  .chart-row { flex-direction: column; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .sentiment-samples { grid-template-columns: 1fr; }
}