/* ========================================
   高级UI样式 - 黑白苹果风格
   Premium UI - Black & White Apple Style
   ======================================== */

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

:root {
  /* 主色调 - 黑白配色 */
  --color-black: #000000;
  --color-dark: #111111;
  --color-dark-secondary: #1f1f1f;
  --color-gray: #333333;
  --color-gray-medium: #666666;
  --color-gray-light: #888888;
  --color-gray-lighter: #aaaaaa;
  --color-white: #ffffff;
  --color-off-white: #f5f5f7;
  
  /* 液态玻璃效果 */
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-bg-dark: rgba(0, 0, 0, 0.05);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-blur: 20px;
  
  /* 阴影 */
  --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-heavy: 0 20px 60px rgba(0, 0, 0, 0.18);
  
  /* 过渡动画 */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%);
  color: var(--color-dark);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   液态玻璃按钮
   Liquid Glass Buttons
   ======================================== */

.btn-liquid {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  overflow: hidden;
  transition: all var(--transition-normal);
  transform: translateZ(0);
}

.btn-liquid::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.4) 0%, 
    rgba(255, 255, 255, 0.1) 50%, 
    rgba(255, 255, 255, 0) 100%);
  pointer-events: none;
  transition: all var(--transition-normal);
}

.btn-liquid::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, 
    transparent 30%, 
    rgba(255, 255, 255, 0.3) 50%, 
    transparent 70%);
  transform: rotate(45deg) translateX(-100%);
  transition: transform 0.6s ease;
  pointer-events: none;
}

.btn-liquid:hover::after {
  transform: rotate(45deg) translateX(100%);
}

.btn-liquid:hover {
  transform: translateY(-2px);
}

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

/* 主要按钮 - 黑白渐变 */
.btn-primary {
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-dark) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-black) 100%);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3), 0 2px 6px rgba(0, 0, 0, 0.15);
}

.btn-primary::before {
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.2) 0%, 
    rgba(255, 255, 255, 0.05) 50%, 
    rgba(255, 255, 255, 0) 100%);
}

/* 次要按钮 - 白色液态玻璃 */
.btn-secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--color-dark);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-light);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-medium);
}

/* 危险按钮 */
.btn-danger {
  background: linear-gradient(135deg, #ff3b30 0%, #cc0000 100%);
  color: var(--color-white);
  box-shadow: 0 4px 20px rgba(255, 59, 48, 0.3), 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-danger:hover {
  box-shadow: 0 8px 30px rgba(255, 59, 48, 0.4), 0 2px 6px rgba(0, 0, 0, 0.15);
}

/* 成功按钮 */
.btn-success {
  background: linear-gradient(135deg, #34c759 0%, #28a745 100%);
  color: var(--color-white);
  box-shadow: 0 4px 20px rgba(52, 199, 89, 0.3), 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-success:hover {
  box-shadow: 0 8px 30px rgba(52, 199, 89, 0.4), 0 2px 6px rgba(0, 0, 0, 0.15);
}

/* 小按钮 */
.btn-sm {
  padding: 10px 20px;
  font-size: 14px;
  border-radius: 10px;
}

/* 大按钮 */
.btn-lg {
  padding: 18px 36px;
  font-size: 17px;
  border-radius: 16px;
}

/* 圆形按钮 */
.btn-circle {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
}

.btn-circle.btn-sm {
  width: 36px;
  height: 36px;
}

.btn-circle.btn-lg {
  width: 60px;
  height: 60px;
}

/* ========================================
   玻璃卡片
   Glass Cards
   ======================================== */

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: var(--shadow-light);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.glass-card-dark {
  background: rgba(0, 0, 0, 0.03);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(0, 0, 0, 0.05);
}

/* ========================================
   导航栏
   Navigation
   ======================================== */

.nav-premium {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-premium .nav-link {
  color: var(--color-gray-medium);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: -0.01em;
  padding: 10px 16px;
  border-radius: 10px;
  transition: all var(--transition-fast);
}

.nav-premium .nav-link:hover {
  color: var(--color-black);
  background: rgba(0, 0, 0, 0.03);
}

.nav-premium .nav-link.active {
  color: var(--color-black);
  font-weight: 500;
}

/* ========================================
   输入框
   Inputs
   ======================================== */

.input-premium {
  width: 100%;
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 400;
  letter-spacing: -0.01em;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 14px;
  color: var(--color-dark);
  transition: all var(--transition-fast);
  outline: none;
}

.input-premium:focus {
  background: var(--color-white);
  border-color: var(--color-black);
  box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.05);
}

.input-premium::placeholder {
  color: var(--color-gray-lighter);
}

/* ========================================
   产品卡片
   Product Cards
   ======================================== */

.product-card-premium {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-light);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.product-card-premium:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: var(--shadow-heavy);
}

.product-card-premium .product-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--color-off-white);
  transition: transform var(--transition-slow);
}

.product-card-premium:hover .product-image {
  transform: scale(1.05);
}

.product-card-premium .product-info {
  padding: 20px;
}

.product-card-premium .product-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-black);
  margin-bottom: 8px;
}

.product-card-premium .product-price {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-black);
}

/* ========================================
   徽章
   Badges
   ======================================== */

.badge-premium {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 8px;
  letter-spacing: -0.01em;
}

.badge-success {
  background: rgba(52, 199, 89, 0.12);
  color: #248a3e;
}

.badge-warning {
  background: rgba(255, 149, 0, 0.12);
  color: #b76a00;
}

.badge-danger {
  background: rgba(255, 59, 48, 0.12);
  color: #d62e24;
}

.badge-info {
  background: rgba(0, 122, 255, 0.12);
  color: #006fcc;
}

.badge-gray {
  background: rgba(102, 102, 102, 0.1);
  color: var(--color-gray);
}

/* ========================================
   动画
   Animations
   ======================================== */

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

/* ========================================
   工具类
   Utilities
   ======================================== */

.text-title {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.text-subtitle {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.text-body {
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.6;
}

.text-small {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* 间距 */
.section-padding {
  padding: 80px 0;
}

.container-wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 分割线 */
.divider-premium {
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(0, 0, 0, 0.1) 50%, 
    transparent 100%);
  margin: 40px 0;
}

/* 加载动画 */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(0, 0, 0, 0.08);
  border-top-color: var(--color-black);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ========================================
   移动端适配
   Mobile Responsive
   ======================================== */

/* ========================================
   Select下拉框美化
   Select Dropdown Styling
   ======================================== */

.input-premium.select-premium {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14' fill='none'%3E%3Cpath d='M3.5 5.25L7 8.75L10.5 5.25' stroke='%23666666' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 14px;
  cursor: pointer;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.input-premium.select-premium:focus {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14' fill='none'%3E%3Cpath d='M3.5 5.25L7 8.75L10.5 5.25' stroke='%23000000' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.input-premium.select-premium::-ms-expand {
  display: none;
}

.input-premium.select-premium option {
  font-size: 15px;
  padding: 10px;
  font-weight: 400;
}

@media (max-width: 768px) {
  .text-title {
    font-size: 32px;
  }
  
  .text-subtitle {
    font-size: 20px;
  }
  
  .container-wide {
    padding: 0 16px;
  }
  
  .section-padding {
    padding: 60px 0;
  }
}