/* 思源宋体 SC 系列 */
@font-face {
  font-family: 'SourceHanSerifSC';
  src: url('../assets/fonts/SourceHanSerifSC-Regular.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SourceHanSerifSC';
  src: url('../assets/fonts/SourceHanSerifSC-Light.otf') format('opentype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SourceHanSerifSC';
  src: url('../assets/fonts/SourceHanSerifSC-Medium.otf') format('opentype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SourceHanSerifSC';
  src: url('../assets/fonts/SourceHanSerifSC-SemiBold.otf') format('opentype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SourceHanSerifSC';
  src: url('../assets/fonts/SourceHanSerifSC-Bold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SourceHanSerifSC';
  src: url('../assets/fonts/SourceHanSerifSC-Heavy.otf') format('opentype');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
}

/* Times New Roman 系列（备用英文衬线） */
@font-face {
  font-family: 'TimesNewRoman';
  src: url('../assets/fonts/TimesNewRomanSpecialG1Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --font-serif: 'SourceHanSerifSC', 'TimesNewRoman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  color: #fff;
  font-family: var(--font-serif);
  overflow-x: hidden;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 10% 2%;
}

/* 按钮 */
.btn-container {
  text-align: center;
  margin: 40px auto;
}

.btn {
  display: inline-block;
  padding: 4px 46px;
  margin-bottom: 10px;
  background: #ff2c55;
  border-radius: 30px;
  text-decoration: none;
  font-size: 22px;
  color: #fff;
  /* 阴影 */
  box-shadow: 0 4px 12px rgba(255, 44, 85, 0.4);
  transition: box-shadow 0.3s ease, transform 0.2s ease;
}

.btn-container small {
  display: block;
  font-size: 13px;
  letter-spacing: 2px;
  color: #a0a0a0;
}

/* 动画 */
.fade {
  opacity: 0;
  transform: translateY(40px);
  transition: .8s;
}

.fade.show {
  opacity: 1;
  transform: translateY(0);
}