/* ============================================
   个人邮局 - 公共基础样式
   仅包含：设计变量、Reset、滚动条、以及各页面
   共用的通用组件（页头、卡片、表单、按钮、提示、
   空状态、弹窗、加载、Quill 库覆盖等）。
   各页面专属样式见对应的 *.css 文件。
   ============================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Primary palette - refined indigo */
  --primary: #4361ee;
  --primary-hover: #3a56d4;
  --primary-light: #eef0ff;
  --primary-subtle: #f5f6ff;

  /* Semantic */
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fef2f2;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --info: #3b82f6;
  --info-light: #eff6ff;

  /* Neutrals */
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;

  /* Surfaces */
  --bg: #f8f9fc;
  --bg-white: #ffffff;
  --bg-elevated: #ffffff;
  --bg-subtle: #f1f3f9;

  /* Text */
  --text: #1e1e2e;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;

  /* Borders */
  --border: #e5e7eb;
  --border-light: #f0f1f3;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  /* Radius */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 72px;
  --sidebar-bg: #ffffff;
  --sidebar-border: #f0f1f3;

  /* Typography */
  --font-sans: 'DM Sans', 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  font-size: 14px;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* ============================================
   PAGE HEADER - 页面标题（通用）
   ============================================ */
.page-header {
  margin-bottom: 28px;
}

.page-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.page-header p {
  font-size: 13.5px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* ============================================
   CARD - 卡片（通用）
   ============================================ */
.card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 28px;
  margin-bottom: 24px;
  border: 1px solid var(--border-light);
  transition: box-shadow var(--transition-base);
}

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

/* ============================================
   FORMS - 表单（通用）
   ============================================ */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}

.form-group label .required {
  color: var(--danger);
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  color: var(--text);
  background: var(--bg-white);
  transition: all var(--transition-fast);
  outline: none;
  font-family: var(--font-sans);
  line-height: 1.5;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-control::placeholder {
  color: var(--gray-400);
}

textarea.form-control {
  min-height: 200px;
  resize: vertical;
  line-height: 1.6;
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239ca3af' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-row .form-group {
  flex: 1;
}

.form-hint {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 5px;
}

/* ============================================
   BUTTONS - 按钮（通用）
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: var(--font-sans);
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background: var(--primary);
  color: var(--text-inverse);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 2px 8px rgba(67, 97, 238, 0.3);
  transform: translateY(-1px);
}

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

.btn-danger {
  background: var(--danger);
  color: var(--text-inverse);
}

.btn-danger:hover {
  background: var(--danger-hover);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-subtle);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12.5px;
}

.btn-sm svg {
  width: 14px;
  height: 14px;
}

.btn-block {
  width: 100%;
}

.btn-group {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

/* ============================================
   ALERTS - 提示（通用）
   ============================================ */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  animation: alertSlideIn 0.3s ease-out;
}

@keyframes alertSlideIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.alert-success {
  background: var(--success-light);
  color: #059669;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background: var(--danger-light);
  color: #dc2626;
  border: 1px solid #fecaca;
}

.alert-info {
  background: var(--info-light);
  color: #2563eb;
  border: 1px solid #bfdbfe;
}

/* ============================================
   EMPTY STATE - 空状态（通用）
   ============================================ */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-tertiary);
}

.empty-state svg {
  width: 56px;
  height: 56px;
  color: var(--gray-300);
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.empty-state p {
  font-size: 13px;
  margin-bottom: 20px;
}

/* ============================================
   MODAL - 弹窗（通用）
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-light);
  transform: translateY(16px) scale(0.98);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-lg {
  max-width: 800px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.modal-header h3 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--text);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  margin-bottom: 20px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ============================================
   LOADING SPINNER - 加载动画（通用）
   ============================================ */
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.hidden {
  display: none !important;
}

/* ============================================
   SECTION HEADER - 区块标题（通用）
   ============================================ */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-header .section-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.section-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ============================================
   QUILL EDITOR OVERRIDES - Quill 库样式覆盖（通用）
   ============================================ */
.ql-toolbar.ql-snow {
  border-top-left-radius: var(--radius-sm);
  border-top-right-radius: var(--radius-sm);
  border-color: var(--border);
  background: var(--gray-50);
}

.ql-container.ql-snow {
  border-bottom-left-radius: var(--radius-sm);
  border-bottom-right-radius: var(--radius-sm);
  border-color: var(--border);
  font-size: 14px;
  font-family: var(--font-sans);
}

/* ============================================
   RESPONSIVE - 表单响应式（通用）
   ============================================ */
@media (max-width: 768px) {
  .form-row {
    flex-direction: column;
    gap: 0;
  }
}