/* Shared chrome for /cost/, /cost/news.html — 《算优台 UI/产品设计规范 V2.0》 */
@import url("/assets/design-tokens.css");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--dt-font-sans, system-ui, -apple-system, sans-serif);
}

body {
  background: var(--dark-bg);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-glow {
  position: fixed;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    color-mix(in srgb, var(--toket-brand, #635bff) 12%, transparent) 0%,
    transparent 68%
  );
  top: -160px;
  right: -160px;
  z-index: 0;
  pointer-events: none;
}
header {
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--dark-bg) 88%, transparent);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 999;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}
header.scrolled {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
:root[data-theme="light"] header {
  background: color-mix(in srgb, var(--card-bg) 92%, transparent);
  border-bottom-color: var(--line);
}

/* 页面内语义小节（如 Prompt Optimizer 的 Hero）勿继承全站顶栏 sticky，否则会与顶栏 z-index 叠层 */
header.hero {
  position: relative;
  top: auto;
  z-index: 0;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom: none;
  box-shadow: none;
  background: transparent;
}

.mobile-menu {
  display: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--primary);
}
.mobile-cta {
  display: none;
}
.mobile-drawer {
  display: none;
}
@media (max-width: 768px) {
  .nav-wrap {
    position: relative;
    min-height: 64px;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu {
    display: block;
    z-index: 999;
    padding: 6px;
    line-height: 1;
  }
  .mobile-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    margin-right: 10px;
    padding: 8px 14px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff !important;
    border: none;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
  }
  .mobile-cta:hover {
    opacity: 0.92;
  }
  .mobile-drawer {
    display: none !important;
  }
  body.mobile-drawer-open {
    overflow: auto !important;
  }
  body.mobile-drawer-open .mobile-drawer {
    display: flex !important;
    position: relative !important;
    z-index: 5 !important;
    background: color-mix(in srgb, var(--dark-bg) 96%, #000) !important;
    border-top: 1px solid var(--line);
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 14px !important;
    padding: 14px 20px 18px !important;
    overflow: visible !important;
  }
  .mobile-drawer a {
    display: inline-flex;
    align-items: center;
    width: 100%;
    font-size: 22px;
    line-height: 1.2;
    font-weight: 600;
    color: var(--text-main) !important;
    text-decoration: none;
  }
  :root[data-theme="light"] body.mobile-drawer-open .mobile-drawer {
    background: #ffffff !important;
    border-top: 1px solid var(--line);
  }
  :root[data-theme="light"] .mobile-drawer a {
    color: var(--text-main) !important;
  }
  @media (prefers-color-scheme: light) {
    :root:not([data-theme]) body.mobile-drawer-open .mobile-drawer {
      background: #ffffff !important;
      border-top: 1px solid var(--line);
    }
    :root:not([data-theme]) .mobile-drawer a {
      color: var(--text-main) !important;
    }
  }
}