/* ===== 布局样式 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 80px 0;
}

/* ===== 加载屏 ===== */
.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: 24px;
  color: var(--md-primary);
  font: 600 24px/32px 'Inter',sans-serif;
}
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--md-outline-variant);
  border-top-color: var(--md-primary);
  border-radius: 50%;
}

/* ===== Hero区域 ===== */
.hero {
  position: relative;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, var(--md-primary-container) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 80%, var(--md-tertiary-container) 0%, transparent 50%),
    radial-gradient(ellipse 40% 40% at 20% 60%, var(--md-primary-container) 0%, transparent 50%),
    var(--md-background);
  opacity: .4;
  z-index: 0;
}
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 0;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--md-shape-full);
  background: color-mix(in srgb, var(--md-secondary-container) 70%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--md-on-secondary-container);
  font: 500 14px/20px 'Inter',sans-serif;
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--md-primary);
}
.hero-title {
  font: 800 57px/64px 'Inter',sans-serif;
  margin-bottom: 16px;
  letter-spacing: -2px;
}
.hero-subtitle {
  font: 700 28px/36px 'Inter',sans-serif;
  margin-bottom: 12px;
}
.hero-desc {
  font: 400 16px/24px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  max-width: 480px;
  margin: 0 auto 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 网格布局 ===== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

/* ===== 卡片（玻璃拟态） ===== */
.card {
  position: relative;
  padding: 32px;
  border-radius: var(--md-shape-lg);
  background: color-mix(in srgb, var(--md-surface-container) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid color-mix(in srgb, var(--md-outline-variant) 60%, transparent);
  transition: all .35s cubic-bezier(.4,0,.2,1);
  will-change: transform, box-shadow, border-color;
}
.card:hover {
  border-color: var(--md-primary);
  box-shadow:
    0 8px 32px color-mix(in srgb, var(--md-primary) 15%, transparent),
    var(--md-elevation-2);
  transform: translateY(-4px) scale(1.01);
}
.card-icon {
  width: 48px; height: 48px;
  border-radius: var(--md-shape-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.card h3 {
  font: 600 16px/24px 'Inter',sans-serif;
  margin-bottom: 8px;
}
.card p {
  font: 400 14px/20px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
}

/* ===== 域名展示卡 ===== */
.domain-card {
  position: relative;
  text-align: center;
  padding: 64px 32px;
  border-radius: var(--md-shape-xl);
  background: var(--md-surface-container-high);
  overflow: hidden;
  border: 1px solid var(--md-outline-variant);
  transition: all .3s;
}
.domain-card:hover {
  border-color: var(--md-primary);
  box-shadow: var(--md-elevation-3);
}
.domain-glow {
  position: absolute;
  top: -50%; left: 50%;
  transform: translateX(-50%);
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--md-primary-container) 0%, transparent 70%);
  opacity: .15;
  pointer-events: none;
}
.domain-content { position: relative; z-index: 1; }
.domain-label {
  font: 500 14px/20px 'Inter',sans-serif;
  color: var(--md-primary);
  margin-bottom: 12px;
  display: block;
}
.domain-name {
  font: 800 45px/52px 'Inter',sans-serif;
  background: linear-gradient(135deg, var(--md-primary), var(--md-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  letter-spacing: -1px;
}
.domain-desc {
  font: 400 16px/24px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  margin-bottom: 32px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--md-surface-container) 70%, transparent);
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  border-bottom: 1px solid var(--md-outline-variant);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--md-on-surface);
  cursor: pointer;
}
.nav-logo .material-symbols-outlined {
  font-size: 24px;
  color: var(--md-primary);
}
.nav-logo span:last-child {
  font: 600 22px/28px 'Inter',sans-serif;
  letter-spacing: -.5px;
}
.nav-links { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 16px;
  border-radius: var(--md-shape-full);
  font: 500 14px/20px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  transition: all .2s;
  border: none;
  background: none;
}
.nav-link:hover { background: var(--md-surface-container-high); color: var(--md-on-surface); }
.nav-link.active { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }

/* ===== 关于页 ===== */
.about-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px;
  border-radius: var(--md-shape-xl);
  background: color-mix(in srgb, var(--md-surface-container) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid color-mix(in srgb, var(--md-outline-variant) 60%, transparent);
  text-align: center;
}
.about-card h2 {
  font: 700 28px/36px 'Inter',sans-serif;
  margin-bottom: 24px;
}
.about-text {
  text-align: left;
  font: 400 16px/24px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  line-height: 1.8;
}
.about-text p { margin-bottom: 16px; }
.about-text strong { color: var(--md-on-surface); }
.about-divider {
  height: 1px;
  background: var(--md-outline-variant);
  margin: 32px 0;
}
.about-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  text-align: left;
}
.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.info-label {
  font: 500 11px/16px 'Inter',sans-serif;
  color: var(--md-outline);
  text-transform: uppercase;
  letter-spacing: .5px;
}
.info-value {
  font: 400 14px/20px 'Inter',sans-serif;
  color: var(--md-on-surface);
}
.info-value a { color: var(--md-primary); }

/* ===== 页脚 ===== */
.footer {
  background: var(--md-surface-container);
  border-top: 1px solid var(--md-outline-variant);
  padding: 48px 0 24px;
}
.footer-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  text-align: center;
}
.footer-logo {
  font: 600 22px/28px 'Inter',sans-serif;
  color: var(--md-primary);
}
.footer-desc {
  font: 400 14px/20px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  margin-top: 4px;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
}
.footer-links a {
  font: 500 14px/20px 'Inter',sans-serif;
  color: var(--md-on-surface-variant);
  transition: color .2s;
}
.footer-links a:hover { color: var(--md-primary); }
.footer-copy {
  font: 400 12px/16px 'Inter',sans-serif;
  color: var(--md-outline);
}

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--md-shape-full);
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font: 500 11px/16px 'Inter',sans-serif;
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }

/* ===== 项目页头 ===== */
.page-header {
  text-align: center;
  padding-top: 120px;
  padding-bottom: 40px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .container { padding: 0 16px; }
  .hero-title { font: 800 36px/44px 'Inter',sans-serif; letter-spacing: -1px; }
  .hero-subtitle { font: 700 20px/28px 'Inter',sans-serif; }
  .hero-subtitle .material-symbols-outlined { font-size: 16px !important; }
  .hero-desc { font-size: 14px; max-width: 100%; margin-bottom: 32px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 280px; justify-content: center; }
  .hero-content { padding: 60px 0; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .domain-name { font: 800 28px/36px 'Inter',sans-serif; }
  .domain-card { padding: 40px 20px; }
  .about-card { padding: 28px 20px; }
  .about-info { grid-template-columns: 1fr; gap: 16px; }
  .page-header { padding-top: 100px; }
  .page-header .section-title { font-size: 28px; }
  .page-header .section-desc { font-size: 14px; }
  .card { padding: 24px; }
  .grid-auto { grid-template-columns: 1fr; }
  .footer { padding: 32px 0 20px; }
  .footer-links { flex-direction: column; gap: 12px; }
}

/* 小手机 */
@media (max-width: 480px) {
  .nav-inner { height: 52px; }
  .nav-links { gap: 4px; }
  .nav-link { padding: 6px 10px; font-size: 12px; }
  .nav-logo span:last-child { font: 600 18px/24px 'Inter',sans-serif; }
  .hero-title { font: 800 28px/34px 'Inter',sans-serif; }
  .hero-subtitle { font: 700 17px/24px 'Inter',sans-serif; }
  .hero { min-height: calc(100vh - 52px); }
  .stat-card { padding: 20px 16px; }
  .section-title { font-size: 24px !important; margin-bottom: 8px; }
  .section-desc { font-size: 13px !important; margin-bottom: 32px; }
  .features-section .grid-2 { gap: 16px; }
  .about-text { font-size: 14px; }
  .about-card h2 { font-size: 24px; }
  .info-label { font-size: 10px; }
  .info-value { font-size: 13px; }
  .footer-logo { font-size: 18px; }
}

/* 超大屏优化 */
@media (min-width: 1400px) {
  .container { max-width: 1200px; }
  .hero-title { font-size: 72px; line-height: 80px; }
  .hero-subtitle { font-size: 32px; line-height: 40px; }
}