/* 多邮箱管理系统 - 优化版 CSS */
:root {
  color-scheme: light dark;
  
  /* 主色调 - 增强对比度 */
  --primary: #7c3aed;
  --primary-dark: #6d28d9;
  --primary-darker: #5b21b6;
  --primary-light: #f0ebfd;
  --primary-lighter: #f9f7fe;
  --accent-pink: #ec4899;
  --accent-pink-light: #fdf2f8;
  
  /* 背景色 */
  --bg: #f5f6fa;
  --bg-alt: #ecedf3;
  --card-bg: #ffffff;
  --card-hover: #fafafc;
  
  /* 边框 */
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --border-focus: var(--primary);
  
  /* 文本 */
  --text: #1e2028;
  --text-secondary: #6b7280;
  --text-muted: #8a8d9c;
  --text-faint: #b5b8c5;
  
  /* 状态色 */
  --success: #10b981;
  --success-bg: #d1fae5;
  --success-text: #065f46;
  --warning: #f59e0b;
  --warning-bg: #fef3c7;
  --warning-text: #92400e;
  --danger: #ef4444;
  --danger-bg: #fee2e2;
  --danger-text: #991b1b;
  --info: #0ea5e9;
  --info-bg: #e0f2fe;
  --info-text: #075985;
  
  /* 圆角 */
  --radius-xl: 20px;
  --radius-lg: 16px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  
  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-primary: 0 8px 20px -4px rgba(124, 58, 237, 0.25);
  
  /* 动画 */
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-alt: #1e293b;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --border: #334155;
    --border-light: #475569;
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-faint: #64748b;
    --primary-light: rgba(124, 58, 237, 0.15);
    --primary-lighter: rgba(124, 58, 237, 0.08);
    --accent-pink-light: rgba(236, 72, 153, 0.1);
    --success-bg: rgba(16, 185, 129, 0.15);
    --warning-bg: rgba(245, 158, 11, 0.15);
    --danger-bg: rgba(239, 68, 68, 0.15);
    --info-bg: rgba(14, 165, 233, 0.15);
  }
}

/* 全局样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", "PingFang SC", "Microsoft YaHei";
  background: var(--bg);
  color: var(--text);
  font-size: 0.875rem;
  line-height: 1.6;
  transition: background-color var(--transition-slow);
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-alt); border-radius: var(--radius-sm); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--radius-sm); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* 登录页面 */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 1rem;
  position: relative;
  overflow: hidden;
}

.login-body::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3), transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.3), transparent 50%);
  animation: pulseGradient 15s ease-in-out infinite;
}

@keyframes pulseGradient {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-xl);
  text-align: center;
  position: relative;
  z-index: 1;
  animation: slideUp 0.4s ease-out;
  backdrop-filter: blur(10px);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.login-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent-pink));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 1.25rem;
  box-shadow: var(--shadow-primary);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.login-card h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.login-sub {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.75rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: left;
}

.login-form label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.login-form input {
  padding: 0.75rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  background: var(--card-hover);
  color: var(--text);
  transition: all var(--transition);
  font-family: inherit;
}

.login-form input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--card-bg);
  box-shadow: 0 0 0 4px var(--primary-light);
  transform: translateY(-1px);
}

.btn-primary.full {
  width: 100%;
  justify-content: center;
  margin-top: 0.5rem;
}

/* 主布局 */
.shell {
  display: flex;
  min-height: 100vh;
  background: var(--bg);
}

/* 侧边栏 */
.sidebar {
  width: 240px;
  background: var(--card-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  margin-bottom: 1.5rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--accent-pink));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-primary);
}

.brand-text {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav-group-label {
  font-size: 0.6875rem;
  color: var(--text-faint);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0 0.75rem 0.625rem;
  margin-top: 0.5rem;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  text-align: left;
  width: 100%;
  transition: all var(--transition);
  position: relative;
}

.nav-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--primary);
  border-radius: 0 99px 99px 0;
  transition: height var(--transition);
}

.nav-item:hover {
  background: var(--primary-lighter);
  color: var(--primary);
  transform: translateX(2px);
}

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}

.nav-item.active::before {
  height: 70%;
}

.nav-icon {
  font-size: 1.125rem;
  width: 20px;
  text-align: center;
  transition: transform var(--transition);
}

.nav-item:hover .nav-icon {
  transform: scale(1.1);
}

.sidebar-spacer { flex: 1; }

.logout-form {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.logout-form .nav-item {
  color: var(--danger-text);
}

.logout-form .nav-item:hover {
  background: var(--danger-bg);
}

/* 主内容区 */
.content {
  flex: 1;
  padding: 1.75rem 2rem;
  background: var(--bg);
  overflow-y: auto;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 顶部栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-light);
}

.topbar-greeting {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.topbar-actions {
  display: flex;
  gap: 0.75rem;
}

.btn-outline {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 99px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-xs);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-outline:active {
  transform: translateY(0);
}

/* 标签页 */
.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.tab-panel.active {
  display: block;
}

/* 统计卡片 */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.25rem;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent-pink));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-icon {
  font-size: 1.5rem;
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.stat-icon.c1 { background: linear-gradient(135deg, #7c3aed, #a78bfa); }
.stat-icon.c2 { background: linear-gradient(135deg, #10b981, #34d399); }
.stat-icon.c3 { background: linear-gradient(135deg, #0ea5e9, #38bdf8); }
.stat-icon.c4 { background: linear-gradient(135deg, #ef4444, #f87171); }

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.375rem;
  font-weight: 600;
}

/* 网格布局 */
.grid-3col {
  display: grid;
  grid-template-columns: 360px 1fr 340px;
  gap: 1.25rem;
  align-items: start;
}

.grid-2col-send {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 1.25rem;
  align-items: start;
}

/* 卡片 */
.card {
  background: var(--card-bg);
  color: var(--text);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow);
}

.card-title-row {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border-light);
}

.card-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.card h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* 工具栏卡片 */
.toolbar-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.875rem;
  box-shadow: var(--shadow-sm);
}

.toolbar-select {
  flex: 1;
  max-width: 380px;
}

.mail-count-tip {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-left: auto;
  font-weight: 600;
  padding: 0.375rem 0.75rem;
  background: var(--primary-lighter);
  border-radius: 99px;
}

/* 提示卡片 */
.tips-card {
  background: linear-gradient(135deg, var(--primary-lighter), var(--accent-pink-light));
  border: 1.5px dashed var(--primary);
  border-opacity: 0.3;
}

.tips-list {
  margin: 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.tips-list code {
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* 表单 */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-grid.compact {
  grid-template-columns: 1fr;
  gap: 0.875rem;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  font-size: 0.75rem;
  color: var(--text-secondary);
  gap: 0.5rem;
  font-weight: 700;
}

.form-grid label.full-width {
  grid-column: 1 / -1;
}

.form-grid input,
.form-grid textarea {
  padding: 0.625rem 0.875rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-family: inherit;
  background: var(--card-hover);
  color: var(--text);
  width: 100%;
  transition: all var(--transition);
}

.form-grid input:focus,
.form-grid textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--card-bg);
  box-shadow: 0 0 0 4px var(--primary-light);
  transform: translateY(-1px);
}

.form-grid input::placeholder,
.form-grid textarea::placeholder {
  color: var(--text-faint);
}

.form-grid textarea {
  resize: vertical;
  min-height: 120px;
}

.custom-fields {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
  padding: 1rem;
  background: var(--card-hover);
  border-radius: var(--radius);
  border: 1.5px dashed var(--border);
}

.custom-fields.hidden,
.hidden {
  display: none !important;
}

.checkbox-label {
  flex-direction: row !important;
  align-items: center;
  gap: 0.5rem !important;
}

.checkbox-label input[type="checkbox"] {
  width: auto;
  cursor: pointer;
  accent-color: var(--primary);
}

/* 下拉选择 */
.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: "▾";
  position: absolute;
  right: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary);
  font-size: 0.875rem;
  pointer-events: none;
  transition: transform var(--transition);
}

.select-wrap:hover::after {
  transform: translateY(-50%) scaleY(1.2);
}

.select-wrap select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  width: 100%;
  padding: 0.625rem 2.25rem 0.625rem 0.875rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background: var(--card-hover);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
}

.select-wrap select:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--card-bg);
  box-shadow: 0 0 0 4px var(--primary-light);
}

/* 按钮 */
.btn-primary,
.btn-secondary {
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: 99px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: inherit;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent-pink));
  color: #fff;
  box-shadow: var(--shadow-primary);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-darker), var(--primary));
  opacity: 0;
  transition: opacity var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -6px rgba(124, 58, 237, 0.4);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary > * {
  position: relative;
  z-index: 1;
}

.form-grid .btn-primary {
  grid-column: 1 / -1;
  justify-self: start;
  margin-top: 0.5rem;
}

.btn-secondary {
  background: var(--primary-light);
  color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: #fff;
}

/* 消息提示 */
.msg {
  font-size: 0.8125rem;
  margin-top: 0.75rem;
  min-height: 20px;
  font-weight: 600;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius);
  display: inline-block;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.msg.success {
  color: var(--success-text);
  background: var(--success-bg);
}

.msg.error {
  color: var(--danger-text);
  background: var(--danger-bg);
}

/* 账户列表 */
.account-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 500px;
  overflow-y: auto;
  padding: 0.25rem;
}

.account-row {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  flex-wrap: wrap;
  transition: all var(--transition);
  background: var(--card-bg);
}

.account-row:hover {
  background: var(--card-hover);
  border-color: var(--primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.account-main {
  flex: 1;
  min-width: 140px;
}

.account-email {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.25rem;
}

.account-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.account-badges {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.account-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
  width: 100%;
  justify-content: flex-end;
  margin-top: 0.5rem;
}

/* 空状态提示 */
.empty-tip {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-faint);
  font-size: 0.875rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.empty-tip .empty-icon {
  font-size: 2.5rem;
  opacity: 0.4;
  filter: grayscale(0.5);
}

/* 药丸按钮 */
.pill-btn {
  border: 1.5px solid transparent;
  background: transparent;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.375rem 0.875rem;
  border-radius: 99px;
  font-family: inherit;
  transition: all var(--transition);
}

.pill-btn.sync {
  background: var(--info-bg);
  color: var(--info-text);
}

.pill-btn.sync:hover {
  background: var(--info);
  color: #fff;
  transform: translateY(-1px);
}

.pill-btn.toggle {
  border-color: var(--border);
  color: var(--text-secondary);
}

.pill-btn.toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-lighter);
}

.pill-btn.delete {
  color: var(--danger-text);
}

.pill-btn.delete:hover {
  background: var(--danger-bg);
  transform: translateY(-1px);
}

/* 邮件列表 */
.mail-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 600px;
  overflow-y: auto;
  padding: 0.25rem;
}

.mail-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition);
  background: var(--card-bg);
}

.mail-row:hover {
  background: var(--card-hover);
  border-color: var(--border);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.mail-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
  box-shadow: 0 0 0 3px var(--primary-light);
}

.mail-subject {
  flex: 1;
  min-width: 0;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-from {
  width: 220px;
  flex-shrink: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-date {
  width: 140px;
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--text-faint);
  text-align: right;
  font-weight: 600;
}

/* 活动动态 */
.activity-feed {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  max-height: 500px;
  overflow-y: auto;
  padding: 0.25rem;
}

.activity-item {
  display: flex;
  gap: 0.875rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition);
}

.activity-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.activity-item:hover {
  transform: translateX(4px);
}

.activity-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 0.375rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-xs);
}

.activity-dot.success {
  background: var(--success);
  box-shadow: 0 0 0 3px var(--success-bg);
}

.activity-dot.failed {
  background: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-bg);
}

.activity-main {
  flex: 1;
  min-width: 0;
}

.activity-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.25rem;
}

.activity-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  line-height: 1.5;
}

.activity-time {
  font-size: 0.6875rem;
  color: var(--text-faint);
  font-weight: 600;
}

/* 徽章 */
.badge {
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: all var(--transition);
}

.badge.on {
  background: var(--success-bg);
  color: var(--success-text);
}

.badge.off {
  background: var(--bg-alt);
  color: var(--text-muted);
}

.badge.success {
  background: var(--success-bg);
  color: var(--success-text);
}

.badge.failed {
  background: var(--danger-bg);
  color: var(--danger-text);
}

.badge.unknown {
  background: var(--bg-alt);
  color: var(--text-muted);
}

/* 模态框 */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s ease-out;
  padding: 1rem;
}

.modal-content {
  background: var(--card-bg);
  color: var(--text);
  border-radius: var(--radius-xl);
  padding: 2rem;
  width: 100%;
  max-width: 700px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.3s ease-out;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: none;
  background: var(--primary-light);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--primary);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.modal-close:hover {
  background: var(--primary);
  color: #fff;
  transform: rotate(90deg);
}

.modal-content h3 {
  margin: 0 2rem 0.75rem 0;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.modal-content .meta {
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin: 0 0 1.25rem;
  line-height: 1.7;
  padding: 0.75rem 1rem;
  background: var(--card-hover);
  border-radius: var(--radius);
  border-left: 3px solid var(--primary);
}

.mail-body {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text);
}

.mail-body iframe {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 300px;
  background: var(--card-bg);
}

.mail-body pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  margin: 0;
  color: var(--text);
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 1rem;
  background: var(--card-hover);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.mail-body .no-content-tip {
  text-align: center;
  padding: 2.5rem;
  color: var(--text-faint);
  font-size: 0.875rem;
  background: var(--card-hover);
  border-radius: var(--radius);
  border: 1.5px dashed var(--border);
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .grid-3col,
  .grid-2col-send {
    grid-template-columns: 1fr;
  }
  
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .shell {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    align-items: center;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 0.875rem 1rem;
  }
  
  .brand {
    margin-bottom: 0;
  }
  
  .brand-text {
    font-size: 1rem;
  }
  
  .nav {
    flex-direction: row;
    gap: 0.5rem;
  }
  
  .nav-item {
    white-space: nowrap;
  }
  
  .nav-group-label,
  .sidebar-spacer {
    display: none;
  }
  
  .content {
    padding: 1rem;
  }
  
  .topbar {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  
  .topbar-greeting {
    font-size: 1.25rem;
  }
  
  .stats-row {
    grid-template-columns: 1fr;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .toolbar-card {
    flex-wrap: wrap;
  }
  
  .mail-row {
    flex-wrap: wrap;
  }
  
  .mail-from,
  .mail-date {
    width: auto;
  }
  
  .account-actions {
    width: 100%;
    justify-content: flex-start;
  }
  
  .modal-content {
    padding: 1.5rem;
  }
  
  .login-card {
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .sidebar {
    padding: 0.75rem;
  }
  
  .nav-item {
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
  }
  
  .topbar {
    margin-bottom: 1rem;
  }
  
  .card {
    padding: 1rem;
  }
  
  .btn-primary,
  .btn-secondary,
  .btn-outline {
    font-size: 0.8125rem;
    padding: 0.5rem 1rem;
  }
}

/* 打印样式 */
@media print {
  .sidebar,
  .topbar-actions,
  .account-actions,
  .nav,
  .logout-form {
    display: none;
  }
  
  .content {
    padding: 0;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}