/* ========================================
   全局变量与基础重置
   ======================================== */
:root {
  /* 主色调 - 品红/紫色渐变系 */
  --color-primary: #e040fb;
  --color-primary-dark: #ab47bc;
  --color-secondary: #7c4dff;
  --color-accent: #ea80fc;

  /* 背景色 */
  --bg-body: #0a0a12;
  --bg-card: #13131f;
  --bg-card-hover: #1a1a2e;
  --bg-changelog: #1a1a2e;

  /* 边框 */
  --border-card: rgba(128, 90, 213, 0.2);
  --border-card-hover: rgba(224, 64, 251, 0.4);

  /* 文字色 */
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;

  /* 间距 */
  --section-padding: 60px 0;
  --container-max-width: 900px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* NOTE: 全局重置，确保一致的盒模型计算 */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========================================
   容器
   ======================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 18, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(128, 90, 213, 0.1);
  transition: background var(--transition-normal);
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-text {
  font-size: 18px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 400;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 1px;
  transition: width var(--transition-normal);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

/* ========================================
   Hero 区域
   ======================================== */
.hero-section {
  padding: 100px 24px 40px;
  display: flex;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* NOTE: 背景光晕效果，为 Hero 区域增加视觉层次 */
.hero-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(224, 64, 251, 0.15), transparent 70%);
  pointer-events: none;
  animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.hero-card {
  width: 100%;
  max-width: var(--container-max-width);
  border-radius: var(--radius-xl);
  padding: 3px;
  /* NOTE: 多层渐变实现边框发光效果 */
  background: linear-gradient(135deg, #e040fb, #ab47bc, #7c4dff, #4a148c);
  position: relative;
  z-index: 1;
  animation: heroFloat 6s ease-in-out infinite;
}

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

.hero-card-inner {
  background: linear-gradient(135deg, #d81b60, #ab47bc, #7c4dff);
  border-radius: calc(var(--radius-xl) - 2px);
  padding: 48px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* NOTE: 叠加噪点纹理，增强质感 */
.hero-card-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.08) 0%, transparent 50%, rgba(0,0,0,0.15) 100%);
  pointer-events: none;
}

.hero-text {
  font-size: 15px;
  line-height: 2;
  color: rgba(255, 255, 255, 0.92);
  font-weight: 400;
  letter-spacing: 0.3px;
  position: relative;
  z-index: 1;
}

/* ========================================
   通用 Section
   ======================================== */
.section {
  padding: var(--section-padding);
}

/* NOTE: section-title 使用左侧色条作为视觉标记，与截图一致 */
.section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.title-bar {
  display: inline-block;
  width: 4px;
  height: 22px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  border-radius: 2px;
  flex-shrink: 0;
}

/* ========================================
   客户端下载
   ======================================== */
.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  transition: border-color var(--transition-normal);
}

.download-card:hover {
  border-color: var(--border-card-hover);
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  background: rgba(128, 90, 213, 0.1);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.version-icon {
  opacity: 0.7;
}

.download-buttons {
  display: flex;
  gap: 14px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

/* 按钮基础样式 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: 0 4px 20px rgba(224, 64, 251, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(224, 64, 251, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-card);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(224, 64, 251, 0.05);
  transform: translateY(-2px);
}

/* 更新日志 */
.changelog {
  background: var(--bg-changelog);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.changelog-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.changelog-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.changelog-list {
  list-style: none;
  padding: 0;
}

.changelog-list li {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.8;
}

.changelog-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* ========================================
   产品简介
   ======================================== */
.intro-text {
  font-size: 14px;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 780px;
}

.platform-tags {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.platform-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  cursor: default;
  transition: all var(--transition-normal);
}

.platform-tag:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(224, 64, 251, 0.06);
  transform: translateY(-2px);
}

/* ========================================
   核心能力
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

/* NOTE: hover 时顶部显示渐变光条 */
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--border-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(224, 64, 251, 0.1);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(224, 64, 251, 0.08);
  border-radius: var(--radius-md);
  margin-bottom: 18px;
  color: var(--color-primary);
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
  background: rgba(224, 64, 251, 0.15);
  transform: scale(1.05);
}

.feature-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 13px;
  line-height: 1.9;
  color: var(--text-secondary);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid rgba(128, 90, 213, 0.1);
  margin-top: 20px;
}

.footer-content {
  text-align: center;
}

.footer-text {
  font-size: 13px;
  color: var(--text-muted);
}

/* ========================================
   滚动显现动画
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero-card-inner {
    padding: 32px 24px;
  }

  .hero-text {
    font-size: 13px;
  }

  .hero-text br {
    display: none;
  }

  .download-card {
    padding: 28px 20px;
  }

  .download-buttons {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .section-title {
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding: 40px 0;
  }

  .hero-section {
    padding: 80px 16px 30px;
  }

  .container {
    padding: 0 16px;
  }
}