/* 全局样式文件 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500&family=Inter:wght@300;400;500&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --white: #FFFFFF;
  --light-gray: #F5F5F7;
  --dark-gray: #1D1D1F;
  --transition-speed: 0.3s;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Sans SC', 'Inter', sans-serif;
  background-color: var(--white);
  color: var(--dark-gray);
  line-height: 1.8;
  overflow-x: hidden;
}

.fade-in {
  animation: fadeIn var(--transition-speed) ease-in;
}

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

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

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

.scale-up {
  transition: transform var(--transition-speed) ease;
}

.scale-up:hover {
  transform: scale(1.05);
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-speed) ease;
}

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

.container-custom {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-spacing {
  padding: 4rem 0;
}

@media (max-width: 768px) {
  .container-custom {
    padding: 0 1rem;
  }
  
  .section-spacing {
    padding: 2rem 0;
  }
}

.lazy-load {
  opacity: 0;
  transition: opacity 0.5s ease-in;
}

.lazy-load.loaded {
  opacity: 1;
}

.skeleton {
  background: linear-gradient(90deg, var(--light-gray) 25%, #E8E8E8 50%, var(--light-gray) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

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

.parallax {
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

:focus-visible {
  outline: 2px solid var(--dark-gray);
  outline-offset: 4px;
}

::selection {
  background-color: var(--dark-gray);
  color: var(--white);
}