/* ============================================
   宇のMusic - 现代玻璃主题样式
   支持深色/浅色模式切换
   适用于登录页和管理后台
   ============================================ */

/* ---------- CSS 变量定义 ---------- */
:root {
  /* 浅色模式（默认） */
  --bg-gradient-start: #a8c0ff;
  --bg-gradient-end: #c4b5fd;
  --glass-bg: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(200, 200, 220, 0.5);
  --glass-shadow: rgba(0, 0, 0, 0.08);
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-placeholder: #94a3b8;
  --input-bg: #ffffff;
  --input-border: #e2e8f0;
  --input-focus-border: rgba(99, 102, 241, 0.5);
  --btn-bg: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
  --btn-hover-bg: linear-gradient(135deg, #a78bfa 0%, #818cf8 100%);
  --btn-text: #ffffff;
  --sidebar-bg: rgba(255, 255, 255, 0.95);
  --card-bg: #ffffff;
  --navbar-bg: #ffffff;
  --body-bg: #f1f5f9;
  --blur-amount: 20px;
  --border-radius: 20px;
  --border-radius-sm: 12px;
  --border-radius-xs: 8px;
  --transition: all 0.3s ease;
}

/* 深色模式 */
[data-theme="dark"] {
  --bg-gradient-start: #1e1b4b;
  --bg-gradient-end: #312e81;
  --glass-bg: rgba(30, 41, 59, 0.98);
  --glass-border: rgba(71, 85, 105, 0.5);
  --glass-shadow: rgba(0, 0, 0, 0.4);
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-placeholder: #64748b;
  --input-bg: #334155;
  --input-border: #475569;
  --input-focus-border: rgba(129, 140, 248, 0.5);
  --btn-bg: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --btn-hover-bg: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
  --btn-text: #ffffff;
  --sidebar-bg: rgba(30, 41, 59, 0.98);
  --card-bg: #1e293b;
  --navbar-bg: #1e293b;
  --body-bg: #0f172a;
}

/* ---------- 基础样式重置 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  background: var(--body-bg);
  color: var(--text-primary);
  transition: var(--transition);
  overflow-x: hidden;
}

/* 登录页背景 */
body.login-page {
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  background-attachment: fixed;
}

/* ---------- 动态背景装饰 ---------- */
.bg-decoration {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-decoration::before,
.bg-decoration::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: float 15s infinite ease-in-out;
}

.bg-decoration::before {
  width: 400px;
  height: 400px;
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.bg-decoration::after {
  width: 300px;
  height: 300px;
  bottom: -50px;
  left: -50px;
  animation-delay: -7s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(30px, 30px) rotate(5deg); }
  50% { transform: translate(0, 50px) rotate(0deg); }
  75% { transform: translate(-30px, 30px) rotate(-5deg); }
}

/* ---------- 玻璃卡片效果 ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border-radius: var(--border-radius);
  border: 1px solid var(--glass-border);
  box-shadow: 
    0 8px 32px var(--glass-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: var(--transition);
}

.glass-card:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 12px 40px var(--glass-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  transition: var(--transition);
  z-index: 1000;
  color: var(--text-primary);
}

.theme-toggle:hover {
  transform: scale(1.1) rotate(15deg);
  background: var(--input-bg);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: var(--transition);
}

.theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg);
}

.theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg);
}

/* ============================================
   登录页面专用样式
   ============================================ */

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  z-index: 1;
}

.login-box {
  width: 100%;
  max-width: 420px;
  padding: 50px 40px;
  text-align: center;
}

.login-logo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--glass-border);
  margin-bottom: 20px;
  box-shadow: 0 4px 15px var(--glass-shadow);
}

.login-title {
  font-size: 26px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.login-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

/* ---------- 输入框样式 ---------- */
.input-group {
  position: relative;
  margin-bottom: 20px;
}

.input-group .input-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 18px;
  transition: var(--transition);
  z-index: 1;
}

.glass-input {
  width: 100%;
  height: 55px;
  padding: 0 20px 0 50px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  transition: var(--transition);
  outline: none;
}

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

.glass-input:focus {
  border-color: var(--input-focus-border);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.glass-input:focus + .input-icon,
.input-group:focus-within .input-icon {
  color: var(--text-primary);
}

/* 验证码区域 */
.captcha-group {
  display: flex;
  gap: 12px;
}

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

.captcha-img {
  height: 55px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--input-border);
}

.captcha-img:hover {
  transform: scale(1.02);
  opacity: 0.9;
}

/* ---------- 按钮样式 ---------- */
.glass-btn {
  width: 100%;
  height: 55px;
  margin-top: 30px;
  background: var(--btn-bg);
  border: none;
  border-radius: var(--border-radius-sm);
  color: var(--btn-text);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 2px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.glass-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left 0.5s ease;
}

.glass-btn:hover {
  background: var(--btn-hover-bg);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.glass-btn:hover::before {
  left: 100%;
}

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

/* ============================================
   管理后台布局样式 - 顶部导航版
   ============================================ */

.admin-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 顶部导航栏 */
.admin-navbar {
  background: var(--navbar-bg);
  border-bottom: 1px solid var(--glass-border);
  padding: 0 30px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 3px var(--glass-shadow);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.navbar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

/* 顶部菜单 */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: 5px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-menu .nav-item {
  position: relative;
}

.navbar-menu .nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius-xs);
  transition: var(--transition);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.navbar-menu .nav-link:hover {
  background: var(--glass-bg);
  color: var(--text-primary);
}

.navbar-menu .nav-link.active {
  background: var(--btn-bg);
  color: #fff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.navbar-menu .nav-icon {
  font-size: 18px;
}

/* 下拉菜单 */
.nav-dropdown {
  position: relative;
}

.nav-dropdown .dropdown-toggle::after {
  content: '';
  border: solid var(--text-secondary);
  border-width: 0 2px 2px 0;
  display: inline-block;
  padding: 3px;
  transform: rotate(45deg);
  margin-left: 6px;
  transition: var(--transition);
}

.nav-dropdown:hover .dropdown-toggle::after {
  transform: rotate(-135deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  box-shadow: 0 10px 40px var(--glass-shadow);
  list-style: none;
  margin: 0;
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(5px);
}

.dropdown-menu .dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 15px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius-xs);
  transition: var(--transition);
  font-size: 14px;
  cursor: pointer;
}

.dropdown-menu .dropdown-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.dropdown-menu .dropdown-item i {
  font-size: 16px;
  width: 20px;
}

/* 右侧操作区 */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 15px;
  background: var(--input-bg);
  border-radius: var(--border-radius-xs);
  cursor: pointer;
  transition: var(--transition);
}

.navbar-user:hover {
  background: var(--glass-bg);
}

.navbar-user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--btn-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
}

.navbar-user-name {
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
}

/* 主内容区 */
.admin-main {
  flex: 1;
  margin-top: 60px;
  padding: 20px;
  position: relative;
  z-index: 1;
}

/* 页面标题栏 */
.page-header {
  margin-bottom: 25px;
}

.page-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 5px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 标签页导航 */
.nav-tabs {
  display: flex;
  gap: 5px;
  background: var(--card-bg);
  padding: 10px;
  border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
  border: 1px solid var(--glass-border);
  border-bottom: none;
  flex-wrap: wrap;
}

.nav-tabs .tab-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius-xs);
  transition: var(--transition);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  background: transparent;
}

.nav-tabs .tab-link:hover {
  background: var(--body-bg);
  color: var(--text-primary);
}

.nav-tabs .tab-link.active {
  background: var(--btn-bg);
  color: #fff;
}

.nav-tabs .tab-link i {
  font-size: 16px;
}

/* 内容iframe容器 */
.content-frame {
  background: var(--card-bg);
  border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
  border: 1px solid var(--glass-border);
  border-top: none;
  overflow: hidden;
  height: calc(100vh - 160px);
}

.content-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: var(--card-bg);
}

/* 移动端菜单按钮 */
.navbar-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-xs);
  background: var(--input-bg);
  border: none;
  color: var(--text-primary);
  font-size: 20px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: var(--card-bg);
  border-bottom: 1px solid var(--glass-border);
  padding: 15px;
  z-index: 999;
  max-height: calc(100vh - 60px);
  overflow-y: auto;
  box-shadow: 0 4px 20px var(--glass-shadow);
}

.mobile-menu.show {
  display: block;
}

.mobile-menu .nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 15px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius-xs);
  font-size: 14px;
}

.mobile-menu .nav-link:hover,
.mobile-menu .nav-link.active {
  background: var(--glass-bg);
  color: var(--text-primary);
}

.mobile-menu .menu-group-title {
  font-size: 12px;
  color: var(--text-placeholder);
  padding: 15px 15px 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* 内容卡片 */
.content-card {
  background: var(--card-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border-radius: var(--border-radius);
  border: 1px solid var(--glass-border);
  padding: 30px;
  margin-bottom: 25px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--glass-border);
}

/* ---------- 表格样式 ---------- */
.glass-table {
  width: 100%;
  border-collapse: collapse;
}

.glass-table th,
.glass-table td {
  padding: 15px 20px;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.glass-table th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.glass-table td {
  color: var(--text-primary);
  font-size: 14px;
}

.glass-table tbody tr {
  transition: var(--transition);
}

.glass-table tbody tr:hover {
  background: var(--glass-bg);
}

/* ---------- 小按钮 ---------- */
.btn-sm {
  padding: 8px 16px;
  border-radius: var(--border-radius-xs);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-sm:hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn-sm.btn-primary {
  background: var(--btn-bg);
  border: none;
}

.btn-sm.btn-danger {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
  border: none;
}

/* ---------- 分页样式 ---------- */
.pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 25px;
}

.page-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-xs);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
}

.page-link:hover,
.page-link.active {
  background: rgba(255, 255, 255, 0.25);
}

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 1200px) {
  .nav-tabs .tab-link span {
    display: none;
  }
  
  .nav-tabs .tab-link {
    padding: 10px 14px;
  }
}

@media (max-width: 992px) {
  .navbar-menu {
    display: none;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
  .admin-main {
    padding: 15px;
  }
  
  .content-frame {
    height: calc(100vh - 180px);
  }
  
  .nav-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
  }
}

@media (max-width: 768px) {
  .login-box {
    padding: 40px 25px;
  }
  
  .login-title {
    font-size: 22px;
  }
  
  .admin-navbar {
    padding: 0 15px;
  }
  
  .navbar-title {
    display: none;
  }
  
  .navbar-user-name {
    display: none;
  }
  
  .admin-main {
    padding: 10px;
    margin-top: 60px;
  }
  
  .content-card {
    padding: 20px;
  }
  
  .content-frame {
    height: calc(100vh - 170px);
    border-radius: var(--border-radius-xs);
  }
  
  .nav-tabs {
    border-radius: var(--border-radius-xs) var(--border-radius-xs) 0 0;
  }
}

/* ============================================
   动画效果
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ============================================
   SweetAlert2 主题适配（简洁版）
   ============================================ */

.swal2-popup {
  border-radius: var(--border-radius) !important;
}

[data-theme="dark"] .swal2-popup {
  background: #1e293b !important;
  color: #f1f5f9 !important;
}

[data-theme="dark"] .swal2-title {
  color: #f1f5f9 !important;
}

[data-theme="dark"] .swal2-html-container {
  color: #cbd5e1 !important;
}

[data-theme="dark"] .swal2-input {
  background: #334155 !important;
  border-color: #475569 !important;
  color: #f1f5f9 !important;
}