/**
 * 官网内页共用顶栏（login / apply / features）
 */

:root {
  --blue: #2e86de;
  --cyan: #0abde3;
  --text: #1e293b;
  --text-soft: #64748b;
  --text-muted: #94a3b8;
  --bg: #eef4fb;
  --surface: #ffffff;
  --border-soft: rgba(46, 134, 222, 0.18);
}

.page-login,
.page-apply,
.page-features {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 42%, #e8f2fc 100%);
  color: var(--text);
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
}

.page-index,
.page-about {
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
}

.page-index .hero {
  padding-top: 4rem;
}

.page-about .about-hero {
  padding-top: 4rem;
}

/* 顶栏 */
.site-topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: 0 4px 20px rgba(30, 41, 59, 0.06);
  backdrop-filter: blur(8px);
}

.site-topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem 1.25rem;
  flex-wrap: wrap;
}

.site-brand-mark {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
  min-width: 0;
}

.site-brand-mark:hover {
  opacity: 0.92;
}

.site-brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  line-height: 1.2;
  min-width: 0;
}

.site-brand-zh {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.site-brand-en {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}

.site-topbar .site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.site-topbar .nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.35rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-topbar .nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-soft);
  text-decoration: none;
  border-radius: 999px;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}

.site-topbar .nav-link:hover {
  color: var(--blue);
  background: rgba(46, 134, 222, 0.08);
}

.site-topbar .nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #1a6bb5);
  box-shadow: 0 2px 8px rgba(46, 134, 222, 0.35);
}

.site-topbar .topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-left: auto;
}

.site-topbar .lang-switch {
  position: static;
  top: auto;
  right: auto;
  flex-shrink: 0;
  padding: 0.2rem;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: #f8fafc;
  box-shadow: none;
}

.site-topbar .lang-btn {
  min-width: 2.25rem;
  padding: 0.35rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 999px;
  color: var(--text-soft);
}

.site-topbar .lang-btn.is-active {
  background: var(--blue);
  color: #fff;
}

.site-topbar .lang-divider {
  color: var(--text-muted);
  font-size: 0.75rem;
  user-select: none;
}

/* 页脚 */
.page-login .site-footer,
.page-apply .site-footer,
.page-features .site-footer {
  margin-top: auto;
  padding: 1.25rem 1rem 1.5rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 隐藏旧版散落结构（仅遗留 DOM，勿影响顶栏内导航） */
.page-login .logo-top,
.page-apply .logo-top,
.page-features .logo-top {
  display: none;
}

@media (max-width: 720px) {
  .site-topbar-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand lang"
      "nav nav";
    align-items: center;
  }

  .site-brand-mark {
    grid-area: brand;
  }

  .site-topbar .topbar-actions {
    grid-area: lang;
    margin-left: 0;
  }

  .site-topbar .site-nav {
    grid-area: nav;
    width: 100%;
  }

  .site-topbar .nav-list {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.15rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .site-brand-en {
    max-width: 140px;
  }
}

@media (max-width: 520px) {
  .site-brand-en {
    max-width: 140px;
  }
}

/* 网页端隐藏「功能介绍」顶栏与页脚入口 */
li.nav-item-features,
li.footer-item-features {
  display: none !important;
}