/* 前端设计美化 - 串丝 AI v2.0 */

/* ========== 全局美化 ========== */
:root {
  /* 渐变背景 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-gold: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-sunset: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --gradient-ocean: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-fire: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  
  /* 现代颜色系统 */
  --primary: #667eea;
  --primary-dark: #5a67d8;
  --secondary: #764ba2;
  --accent: #f093fb;
  --success: #48bb78;
  --danger: #f56565;
  --warning: #ed8936;
  --info: #4299e1;
  
  /* 深色主题 */
  --bg-dark: #0f0f23;
  --bg-card: #1a1a3e;
  --bg-elevated: #252550;
  
  /* 文字颜色 */
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  
  /* 玻璃态效果 */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  
  /* 现代间距 */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  
  /* 现代圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* 现代阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.5);
  
  /* 现代过渡 */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
  background: var(--bg-dark);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* ========== 头部导航美化 ========== */
.header {
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-md) var(--space-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  background: linear-gradient(135deg, #667eea, #f093fb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  transition: transform var(--transition-base);
}

.logo:hover {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.nav-links a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.nav-links a:hover::before {
  width: 100%;
}

/* ========== 英雄区域美化 ========== */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
  animation: rotate 30s linear infinite;
}

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

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  background: linear-gradient(135deg, #667eea 0%, #f093fb 50%, #f5576c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
  text-shadow: 0 0 40px rgba(102, 126, 234, 0.5);
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  position: relative;
  z-index: 1;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* ========== 按钮美化 ========== */
.btn {
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

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

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-3px);
}

/* ========== 卡片美化 ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.card:hover::before {
  opacity: 1;
}

/* ========== 表单美化 ========== */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

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

.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  background: rgba(255, 255, 255, 0.08);
}

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

/* ========== 套餐卡片美化 ========== */
.package-card {
  background: var(--bg-card);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.package-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.package-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-glow);
  border-color: var(--primary);
}

.package-card:hover::after {
  transform: scaleX(1);
}

.package-card.recommended {
  border-color: var(--primary);
  box-shadow: 0 0 30px rgba(102, 126, 234, 0.3);
}

.package-card.recommended::before {
  content: '🔥 热销';
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--gradient-primary);
  color: white;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
}

/* ========== 风格选择美化 ========== */
.style-option {
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}

.style-option:hover {
  border-color: var(--primary);
  background: rgba(102, 126, 234, 0.1);
  transform: translateY(-3px);
}

.style-option.selected {
  border-color: var(--primary);
  background: rgba(102, 126, 234, 0.2);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

.style-icon {
  font-size: 2.5em;
  margin-bottom: var(--space-xs);
  filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.5));
}

/* ========== 模态框美化 ========== */
.modal-overlay {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-xl);
  position: relative;
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-close {
  width: 36px;
  height: 36px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  transition: all var(--transition-base);
}

.modal-close:hover {
  background: var(--danger);
  color: white;
  transform: rotate(90deg);
}

/* ========== 加载动画美化 ========== */
.spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

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

/* ========== 消息提示美化 ========== */
.message-box {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-full);
  margin: var(--space-sm) 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  backdrop-filter: blur(10px);
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.message-box.success {
  background: rgba(72, 187, 120, 0.2);
  border: 1px solid rgba(72, 187, 120, 0.3);
  color: #68d391;
}

.message-box.error {
  background: rgba(245, 101, 101, 0.2);
  border: 1px solid rgba(245, 101, 101, 0.3);
  color: #fc8181;
}

.message-box.warning {
  background: rgba(237, 137, 54, 0.2);
  border: 1px solid rgba(237, 137, 54, 0.3);
  color: #f6ad55;
}

.message-box.info {
  background: rgba(66, 153, 225, 0.2);
  border: 1px solid rgba(66, 153, 225, 0.3);
  color: #90cdf4;
}

/* ========== 底部美化 ========== */
.footer {
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-xl);
  margin-top: var(--space-2xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  text-align: center;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin: var(--space-md) 0;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

/* ========== 响应式优化 ========== */
@media (max-width: 768px) {
  .hero {
    padding: var(--space-lg);
  }
  
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
  
  .generate-grid {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* ========== 动画效果 ========== */
.fade-in {
  animation: fadeIn 0.5s ease;
}

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

.slide-up {
  animation: slideUp 0.5s ease;
}

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

/* ========== 玻璃态卡片 ========== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--glass-shadow);
}

/* ========== 渐变文字 ========== */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== 发光效果 ========== */
.glow {
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
}

.glow-hover:hover {
  box-shadow: 0 0 30px rgba(102, 126, 234, 0.8);
}