/**
 * 纤伴益生菌 AI 官网 - 全局公共样式
 * 包含: CSS变量、reset、布局工具、响应式断点
 */

/* ==================== CSS 变量 ==================== */
:root {
  /* 品牌色系 */
  --qianban-color-primary: #E84C88;        /* 品牌粉（炫酷升级） */
  --qianban-color-primary-light: #E892B4;  /* 浅粉 */
  --qianban-color-primary-dark: #D63B6E;   /* 深粉 */
  --qianban-color-white: #FFFFFF;          /* 纯净白 */
  --qianban-color-gold: #C9A96E;           /* 轻奢金 */
  --qianban-color-blue: #4A90D9;          /* 科技蓝 */
  --qianban-color-blue-light: #6BAEE8;     /* 浅科技蓝 */

  /* 文字色 */
  --qianban-color-text: #2D2D2D;          /* 文字主色 */
  --qianban-color-text-secondary: #888888;/* 文字辅色 */
  --qianban-color-text-light: #BFBFBF;    /* 文字浅色 */

  /* 背景色 */
  --qianban-color-bg: #FFF5F8;            /* 背景浅粉 */
  --qianban-color-bg-white: #FFFFFF;      /* 背景白 */
  --qianban-color-bg-gray: #F5F5F7;       /* 背景灰 */

  /* 状态色 */
  --qianban-color-success: #52C41A;       /* 成功绿 */
  --qianban-color-warning: #FA8C16;       /* 警示橙 */
  --qianban-color-danger: #FF4D4F;        /* 危险红 */

  /* 渐变 */
  --qianban-gradient-primary: linear-gradient(135deg, #E84C88 0%, #E892B4 100%);
  --qianban-gradient-gold: linear-gradient(135deg, #C9A96E 0%, #E5C9A0 100%);
  --qianban-gradient-blue: linear-gradient(135deg, #4A90D9 0%, #6BAEE8 100%);
  --qianban-gradient-hero: linear-gradient(135deg, #FFF5F8 0%, #FFE4EC 50%, #FFD1DD 100%);
  --qianban-gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,245,248,0.8) 100%);

  /* 圆角 */
  --qianban-radius-sm: 6px;
  --qianban-radius-md: 12px;
  --qianban-radius-lg: 20px;
  --qianban-radius-full: 9999px;

  /* 阴影 */
  --qianban-shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --qianban-shadow-md: 0 2px 8px rgba(0,0,0,0.08);
  --qianban-shadow-lg: 0 8px 24px rgba(232,76,136,0.12);
  --qianban-shadow-xl: 0 12px 40px rgba(232,76,136,0.18);
  --qianban-shadow-gold: 0 4px 16px rgba(201,169,110,0.25);

  /* 间距（8px基准） */
  --qianban-space-xs: 4px;
  --qianban-space-sm: 8px;
  --qianban-space-md: 16px;
  --qianban-space-lg: 24px;
  --qianban-space-xl: 32px;
  --qianban-space-2xl: 48px;
  --qianban-space-3xl: 64px;

  /* 字号 */
  --qianban-font-h1: 36px;
  --qianban-font-h2: 28px;
  --qianban-font-h3: 22px;
  --qianban-font-body: 16px;
  --qianban-font-small: 14px;
  --qianban-font-tiny: 12px;

  /* 过渡 */
  --qianban-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --qianban-transition-fast: all 0.15s ease;

  /* 布局 */
  --qianban-max-width: 1200px;
  --qianban-header-height: 64px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: var(--qianban-font-body);
  line-height: 1.6;
  color: var(--qianban-color-text);
  background-color: var(--qianban-color-bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ==================== 布局工具 ==================== */
.qianban-container {
  max-width: var(--qianban-max-width);
  margin: 0 auto;
  padding: 0 var(--qianban-space-lg);
}

.qianban-container--narrow {
  max-width: 800px;
}

.qianban-section {
  padding: var(--qianban-space-3xl) 0;
}

.qianban-section--tight {
  padding: var(--qianban-space-2xl) 0;
}

.qianban-text-center { text-align: center; }
.qianban-text-left { text-align: left; }
.qianban-text-right { text-align: right; }

.qianban-hidden { display: none !important; }
.qianban-block { display: block; }
.qianban-inline-block { display: inline-block; }
.qianban-flex { display: flex; }
.qianban-flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.qianban-flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.qianban-mt-sm { margin-top: var(--qianban-space-sm); }
.qianban-mt-md { margin-top: var(--qianban-space-md); }
.qianban-mt-lg { margin-top: var(--qianban-space-lg); }
.qianban-mt-xl { margin-top: var(--qianban-space-xl); }

/* ==================== 响应式断点 ==================== */
/* 移动端优先：默认样式为移动端 */
/* 平板 ≥ 768px */
@media (min-width: 768px) {
  :root {
    --qianban-font-h1: 42px;
    --qianban-font-h2: 32px;
    --qianban-font-h3: 24px;
  }
}

/* 桌面端 ≥ 1024px */
@media (min-width: 1024px) {
  :root {
    --qianban-font-h1: 48px;
    --qianban-font-h2: 36px;
  }
}

/* ==================== 通用标题样式 ==================== */
.qianban-section-title {
  font-size: var(--qianban-font-h2);
  color: var(--qianban-color-text);
  text-align: center;
  margin-bottom: var(--qianban-space-md);
  position: relative;
}

.qianban-section-subtitle {
  font-size: var(--qianban-font-body);
  color: var(--qianban-color-text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--qianban-space-xl);
}

.qianban-section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--qianban-gradient-primary);
  border-radius: var(--qianban-radius-full);
  margin: var(--qianban-space-sm) auto 0;
}

/* ==================== 动画 ==================== */
@keyframes qianban-fade-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes qianban-fade-in-up {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes qianban-scale-in {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes qianban-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes qianban-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.9; }
}

@keyframes qianban-shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

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

@keyframes qianban-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

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

.qianban-animate-fade-in-up {
  animation: qianban-fade-in-up 0.8s ease forwards;
}

.qianban-animate-scale-in {
  animation: qianban-scale-in 0.5s ease forwards;
}

.qianban-animate-float {
  animation: qianban-float 3s ease-in-out infinite;
}

/* ==================== 加载动画 ==================== */
.qianban-loading {
  display: inline-block;
  width: 36px;
  height: 36px;
  border: 3px solid var(--qianban-color-primary-light);
  border-top-color: var(--qianban-color-primary);
  border-radius: 50%;
  animation: qianban-spin 0.8s linear infinite;
}

.qianban-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  gap: var(--qianban-space-md);
}

.qianban-loading-overlay .qianban-loading-text {
  font-size: var(--qianban-font-body);
  color: var(--qianban-color-text-secondary);
}

/* ==================== 骨架屏 ==================== */
.qianban-skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: qianban-shimmer 1.5s infinite;
  border-radius: var(--qianban-radius-sm);
}

/* ==================== 图片懒加载 ==================== */
.qianban-lazy-img {
  opacity: 0;
  transition: opacity 0.3s ease;
}

.qianban-lazy-img.qianban-loaded {
  opacity: 1;
}

/* ==================== 粒子/光晕背景 ==================== */
.qianban-glow-bg {
  position: relative;
  overflow: hidden;
}

.qianban-glow-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(232,76,136,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.qianban-glow-bg::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(74,144,217,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* ==================== 滚动条美化 ==================== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

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

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

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

.qianban-text-gradient-gold {
  background: var(--qianban-gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==================== 合规声明 ==================== */
.qianban-disclaimer {
  text-align: center;
  padding: var(--qianban-space-lg) var(--qianban-space-md);
  font-size: var(--qianban-font-tiny);
  color: var(--qianban-color-text-secondary);
  background: var(--qianban-color-bg-gray);
  border-top: 1px solid rgba(0,0,0,0.05);
}

/* ==================== 页脚 ==================== */
.qianban-footer {
  background: linear-gradient(135deg, #2D2D2D 0%, #1a1a1a 100%);
  color: rgba(255,255,255,0.7);
  padding: var(--qianban-space-2xl) var(--qianban-space-lg) var(--qianban-space-lg);
}

.qianban-footer__content {
  max-width: var(--qianban-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--qianban-space-lg);
}

.qianban-footer__brand {
  font-size: var(--qianban-font-h3);
  font-weight: 700;
  color: var(--qianban-color-primary-light);
  margin-bottom: var(--qianban-space-sm);
}

.qianban-footer__desc {
  font-size: var(--qianban-font-small);
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
}

.qianban-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--qianban-space-md);
  margin-top: var(--qianban-space-md);
}

.qianban-footer__links a {
  color: rgba(255,255,255,0.6);
  font-size: var(--qianban-font-small);
}

.qianban-footer__links a:hover {
  color: var(--qianban-color-primary-light);
}

.qianban-footer__copyright {
  text-align: center;
  margin-top: var(--qianban-space-xl);
  padding-top: var(--qianban-space-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: var(--qianban-font-tiny);
  color: rgba(255,255,255,0.4);
}

@media (min-width: 768px) {
  .qianban-footer__content {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* ==================== 移动端底部安全区 ==================== */
.qianban-safe-bottom {
  padding-bottom: env(safe-area-inset-bottom, 0);
}