/* ============================================================
   Layik 交友 - 公共样式
   ============================================================ */

:root {
  --primary: #FF6B6B;
  --primary-dark: #EE5A5A;
  --primary-light: #FF8A8A;
  --secondary: #4ECDC4;
  --accent: #FFE66D;
  --success: #52C41A;
  --warning: #FAAD14;
  --danger: #FF4D4F;
  --info: #1890FF;
  
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --text-light: #CCCCCC;
  --text-white: #FFFFFF;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-tertiary: #FAFAFA;
  --bg-dark: #1F1F1F;
  
  --border: #EEEEEE;
  --border-light: #F0F0F0;
  --border-dark: #D9D9D9;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-round: 9999px;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  --font-xs: 12px;
  --font-sm: 14px;
  --font-md: 16px;
  --font-lg: 18px;
  --font-xl: 24px;
  --font-xxl: 32px;
  
  --header-height: 60px;
  --sidebar-width: 220px;
  --tabbar-height: 56px;
  
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: var(--font-md);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  line-height: 1.6;
  min-height: 100vh;
}

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

img { max-width: 100%; height: auto; display: block; }

button { cursor: pointer; border: none; outline: none; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; outline: none; }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: var(--font-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
  user-select: none;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-primary { background: var(--primary); color: var(--text-white); }
.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary { background: var(--bg-secondary); color: var(--text-primary); border-color: var(--border); }
.btn-secondary:hover { background: var(--border-light); }

.btn-danger { background: var(--danger); color: var(--text-white); }
.btn-danger:hover { background: #E04345; }

.btn-success { background: var(--success); color: var(--text-white); }

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

.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-secondary); }

.btn-block { display: flex; width: 100%; }
.btn-large { padding: 14px 28px; font-size: var(--font-md); border-radius: var(--radius-lg); }
.btn-small { padding: 6px 12px; font-size: var(--font-xs); }

/* ========== 表单 ========== */
.input-group {
  position: relative;
  margin-bottom: var(--spacing-md);
}

.input {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--font-sm);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.input::placeholder { color: var(--text-tertiary); }

.input-error { border-color: var(--danger); }
.input-error:focus { box-shadow: 0 0 0 3px rgba(255, 77, 79, 0.1); }

.input-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.input-hint {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-xs);
  color: var(--text-tertiary);
}

.input-error-text {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-xs);
  color: var(--danger);
}

.form-group { margin-bottom: var(--spacing-md); }

.form-row {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.form-row .input-group { flex: 1; margin-bottom: 0; }

/* ========== 卡片 ========== */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
}

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

.card-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
  font-weight: 600;
}

.card-body { padding: var(--spacing-md); }
.card-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-light);
  background: var(--bg-tertiary);
}

/* ========== 头像 ========== */
.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--border-light);
  flex-shrink: 0;
}

.avatar-sm { width: 32px; height: 32px; }
.avatar-md { width: 48px; height: 48px; }
.avatar-lg { width: 80px; height: 80px; }
.avatar-xl { width: 120px; height: 120px; }

.avatar img { width: 100%; height: 100%; object-fit: cover; }

/* ========== 徽章 ========== */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  font-size: var(--font-xs);
  color: var(--text-white);
  background: var(--danger);
  border-radius: var(--radius-round);
}

.badge-primary { background: var(--primary); }
.badge-success { background: var(--success); }
.badge-warning { background: var(--warning); }

/* ========== 标签 ========== */
.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: var(--font-xs);
  color: var(--primary);
  background: rgba(255, 107, 107, 0.1);
  border-radius: var(--radius-round);
  margin: 2px;
}

.tag-primary { background: rgba(255, 107, 107, 0.1); color: var(--primary); }
.tag-secondary { background: rgba(78, 205, 196, 0.1); color: var(--secondary); }
.tag-success { background: rgba(82, 196, 26, 0.1); color: var(--success); }
.tag-warning { background: rgba(250, 173, 20, 0.1); color: var(--warning); }
.tag-default { background: var(--bg-secondary); color: var(--text-secondary); }

/* ========== Flex 工具类 ========== */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-column { display: flex; flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }

.align-center { align-items: center; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ========== 间距工具类 ========== */
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ========== 加载 ========== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: var(--text-tertiary);
}

.loading::after {
  content: '';
  width: 20px;
  height: 20px;
  margin-left: var(--spacing-sm);
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideDown { from { transform: translateY(-20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }

/* ========== 空状态 ========== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--text-tertiary);
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state-text {
  font-size: var(--font-sm);
  margin-bottom: var(--spacing-md);
}

/* ========== Toast ========== */
.toast-container {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  padding: 12px 24px;
  background: var(--bg-dark);
  color: var(--text-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideDown 0.3s ease;
  font-size: var(--font-sm);
  max-width: 300px;
  text-align: center;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-warning { background: var(--warning); }

/* ========== Modal ========== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 400px;
  max-height: 80vh;
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

.modal-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
  font-weight: 600;
  font-size: var(--font-md);
}

.modal-body { padding: var(--spacing-md); max-height: 50vh; overflow-y: auto; }
.modal-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-light);
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .card-mobile-full { border-radius: 0; box-shadow: none; }
  .form-row { flex-direction: column; }
  .btn-large { width: 100%; }
}

@media (min-width: 769px) {
  .container { max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-lg); }
}

/* ========== 隐藏 ========== */
.hidden { display: none !important; }
.visible-mobile { display: block; }
.visible-pc { display: none; }

@media (min-width: 769px) {
  .visible-mobile { display: none; }
  .visible-pc { display: block; }
}

/* ========== 文字 ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }

/* ========== 滚动条 ========== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-dark); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ========== 安全区域 ========== */
.safe-area-bottom { padding-bottom: env(safe-area-inset-bottom); }
.safe-area-top { padding-top: env(safe-area-inset-top); }