* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

:root {
  --primary: #4361ee;
  --primary-light: #4895ef;
  --secondary: #06d6a0;
  --danger: #ef476f;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --border-radius: 16px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;

  /* 新增深色模式变量 */
  --bg-gradient-start: #f0f4ff;
  --bg-gradient-end: #e6f7ff;
  --card-bg: white;
  --card-header-bg: linear-gradient(to right, #f8f9fa, #e9ecef);
  --text-color: #212529;
  --subtitle-color: #6c757d;
  --content-bg: #f8f9fa;
  --agreement-bg: #f8f9fa;
  --agreement-border: rgba(0, 0, 0, 0.1);
  --agreement-color: #6c757d;
}

body {
  background: linear-gradient(
    135deg,
    var(--bg-gradient-start) 0%,
    var(--bg-gradient-end) 100%
  );
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 800px;
  position: relative;
}

/* 语言切换按钮 */
.lang-switch {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
  background: var(--card-bg);
  border-radius: 50px;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  font-size: 1rem;
}

.lang-switch:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  background: var(--primary);
  color: white;
}

.lang-emoji {
  font-size: 1.3rem;
}

/* 头部样式 */
.header {
  text-align: center;
  margin-bottom: 30px;
  position: relative;
  padding-top: 20px;
}

.logo-container {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.logo {
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  animation: float 3s ease-in-out infinite;
  font-size: 3.5rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 10px;
  background: linear-gradient(to right, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 1.2rem;
  color: var(--subtitle-color);
  font-weight: 500;
  max-width: 600px;
  margin: 0 auto;
}

/* 卡片样式 */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 30px;
  transform: translateY(0);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.card-header {
  padding: 20px;
  background: var(--card-header-bg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-title .emoji {
  font-size: 1.5rem;
}

.card-body {
  padding: 25px;
}

.policy-section {
  margin-top: 30px;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title .emoji {
  font-size: 1.3rem;
}

.content-box {
  background-color: var(--content-bg);
  border-radius: 12px;
  padding: 20px;
  margin-top: 10px;
  border: 1px solid rgba(0, 0, 0, 0.05);
  line-height: 1.7;
  display: flex;
  justify-content: center;
}

.content-box a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  position: relative;
  font-size: 1.1rem;
  padding: 10px 20px;
  border-radius: 30px;
  background-color: rgba(67, 97, 238, 0.1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.content-box a:hover {
  background-color: rgba(67, 97, 238, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(67, 97, 238, 0.2);
}

.content-box a .emoji {
  font-size: 1.2rem;
}

.content-box p {
  font-size: 1rem;
}

.agreement {
  text-align: center;
  padding: 20px;
  background-color: var(--agreement-bg);
  border-radius: var(--border-radius);
  margin: 25px 0;
  font-style: italic;
  color: var(--agreement-color);
  border: 1px dashed var(--agreement-border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.agreement .emoji {
  font-size: 1.5rem;
}

.buttons {
  display: flex;
  gap: 20px;
  margin-top: 30px;
}

.btn {
  flex: 1;
  padding: 16px 20px;
  border: none;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn-primary {
  background: linear-gradient(to right, var(--primary), var(--primary-light));
  color: white;
  box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(67, 97, 238, 0.4);
  background: linear-gradient(to right, var(--primary-light), var(--primary));
}

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

.btn-outline:hover {
  background-color: rgba(239, 71, 111, 0.05);
  transform: translateY(-3px);
}

/* 多语言内容控制 */
.lang-zh,
.lang-en {
  display: none;
}

.lang-zh.active,
.lang-en.active {
  display: block;
}

/* 动画效果 */
@keyframes float {
  0% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-10px);
  }

  100% {
    transform: translateY(0px);
  }
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  .buttons {
    flex-direction: column;
    gap: 12px;
  }

  .card-body {
    padding: 20px;
  }

  .subtitle {
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.8rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .logo {
    width: 90px;
    height: 90px;
    font-size: 2.8rem;
  }

  .lang-switch {
    top: 10px;
    right: 10px;
    padding: 8px 14px;
    font-size: 0.9rem;
  }

  .content-box a {
    font-size: 0.95rem;
    padding: 8px 15px;
  }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;
    --card-bg: #1e293b;
    --card-header-bg: linear-gradient(to right, #334155, #1e293b);
    --text-color: #e2e8f0;
    --subtitle-color: #94a3b8;
    --content-bg: #334155;
    --agreement-bg: #334155;
    --agreement-border: rgba(255, 255, 255, 0.1);
    --agreement-color: #cbd5e1;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

  .lang-switch {
    background: #334155;
    color: #e2e8f0;
  }

  .content-box a {
    background-color: rgba(67, 97, 238, 0.15);
    color: #93c5fd;
  }

  .content-box a:hover {
    background-color: rgba(67, 97, 238, 0.25);
    box-shadow: 0 4px 10px rgba(67, 97, 238, 0.2);
  }

  .btn-outline:hover {
    background-color: rgba(239, 71, 111, 0.15);
  }
}