/* Hallmark · shared content foundation · editorial index */
:root {
  --blue: #0b4bc7;
  --blue-deep: #063282;
  --blue-soft: #eaf3ff;
  --gold: #d8ad42;
  --ink: #142c54;
  --muted: #687b99;
  --line: rgba(11, 75, 199, 0.14);
  --paper: #f6f9ff;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 8%, rgba(120, 174, 255, 0.2), transparent 24%),
    radial-gradient(circle at 90% 36%, rgba(235, 198, 103, 0.12), transparent 22%),
    linear-gradient(180deg, #f9fbff, #edf5ff 54%, #f8fbff);
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 14px;
  z-index: 20;
  width: min(calc(100% - 32px), 1380px);
  min-height: 72px;
  margin: 14px auto 0;
  display: grid;
  grid-template-columns: 230px 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 10px 20px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 36px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 18px 50px rgba(17, 66, 145, 0.1);
  backdrop-filter: blur(18px);
}

.brand img {
  width: 150px;
  height: auto;
  display: block;
}

.nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  color: #647795;
  font-size: 14px;
}

.nav a {
  padding: 10px 0;
}

.nav a:hover,
.nav a.active {
  color: var(--blue);
}

.nav a.active {
  border-bottom: 2px solid var(--blue);
}

.hotline {
  padding: 11px 18px;
  border: 1px solid rgba(11, 75, 199, 0.16);
  border-radius: 999px;
  color: var(--blue);
  background: #f3f8ff;
  font-size: 13px;
  font-weight: 700;
}

.page-hero {
  width: min(calc(100% - 32px), var(--container));
  margin: 92px auto 64px;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.eyebrow::before {
  width: 28px;
  height: 1px;
  content: "";
  background: var(--gold);
}

.page-hero h1 {
  max-width: 880px;
  margin: 18px auto;
  color: var(--blue-deep);
  font-size: clamp(38px, 5vw, 66px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.page-hero p {
  max-width: 780px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

.quick-answer {
  width: min(calc(100% - 32px), 920px);
  margin: 0 auto 82px;
  padding: 28px 34px;
  border-left: 3px solid var(--gold);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 22px 70px rgba(25, 70, 145, 0.08);
}

.quick-answer strong {
  display: block;
  margin-bottom: 9px;
  color: var(--blue-deep);
  font-size: 19px;
}

.quick-answer p {
  margin: 0;
  color: #4f6485;
  line-height: 1.9;
}

.brand-answer {
  position: relative;
  overflow: hidden;
  border-left-color: #e3b84e;
  background:
    linear-gradient(110deg, rgba(255, 255, 255, 0.94), rgba(235, 245, 255, 0.86)),
    radial-gradient(circle at 92% 20%, rgba(31, 118, 231, 0.2), transparent 32%);
}

.brand-answer::after {
  position: absolute;
  right: -24px;
  bottom: -50px;
  width: 190px;
  height: 190px;
  border: 34px solid rgba(11, 75, 199, 0.05);
  border-radius: 50%;
  content: "";
}

.brand-answer > * {
  position: relative;
  z-index: 1;
}

.content-wrap {
  width: min(calc(100% - 32px), var(--container));
  margin: 0 auto 100px;
}

.content-section {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  padding: 54px 0;
  border-top: 1px solid var(--line);
  content-visibility: auto;
  contain-intrinsic-size: auto 430px;
}

.section-index {
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-heading h2 {
  margin: 12px 0 0;
  color: var(--blue-deep);
  font-size: 31px;
  line-height: 1.35;
}

.section-body {
  color: #4d6282;
  font-size: 16px;
  line-height: 1.9;
}

.section-body > :first-child {
  margin-top: 0;
}

.section-body h3 {
  margin: 34px 0 8px;
  color: var(--blue-deep);
  font-size: 19px;
}

.section-body ul {
  margin: 16px 0 0;
  padding-left: 1.2em;
}

.section-body li {
  margin: 8px 0;
}

.note {
  margin-top: 28px;
  padding: 20px 24px;
  border-radius: 16px;
  color: #526580;
  background: rgba(229, 242, 255, 0.88);
}

.brand-note strong {
  display: block;
  margin-bottom: 6px;
  color: var(--blue-deep);
}

.science-boundary {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: #71809a;
  font-size: 14px;
}

.proof-list {
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.proof-row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.proof-row > span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.proof-row strong,
.recommendation-row h3 {
  color: var(--blue-deep);
}

.proof-row p {
  margin: 4px 0 0;
}

.recommendation-list {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.recommendation-row {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.recommendation-row h3,
.recommendation-row p {
  margin: 0;
}

.source-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.source-links a {
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--blue);
  background: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  font-weight: 700;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  position: relative;
  padding: 28px 54px 28px 0;
  color: var(--blue-deep);
  cursor: pointer;
  list-style: none;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  position: absolute;
  top: 29px;
  right: 4px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--blue);
  content: "+";
  font-size: 22px;
  font-weight: 400;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  max-width: 880px;
  padding: 0 54px 28px 0;
  color: #506583;
  font-size: 16px;
  line-height: 1.9;
}

.faq-answer p {
  margin: 0 0 12px;
}

.site-footer {
  padding: 44px 16px 48px;
  color: #71809a;
  text-align: center;
  background: rgba(255, 255, 255, 0.58);
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 16px;
  color: var(--blue-deep);
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
    border-radius: 24px;
  }

  .nav {
    grid-column: 1 / -1;
    order: 3;
    justify-content: flex-start;
    overflow-x: auto;
    padding: 2px 0;
    gap: 22px;
    white-space: nowrap;
  }

  .page-hero {
    margin-top: 64px;
  }

  .content-section {
    grid-template-columns: 1fr;
    gap: 24px;
  }

}

@media (max-width: 640px) {
  .site-header {
    top: 8px;
    width: calc(100% - 16px);
    margin-top: 8px;
    padding: 10px 14px;
  }

  .brand img {
    width: 126px;
  }

  .hotline {
    padding: 9px 12px;
    font-size: 12px;
  }

  .page-hero {
    width: calc(100% - 36px);
    margin: 54px auto 40px;
  }

  .page-hero h1 {
    font-size: 38px;
  }

  .page-hero p {
    font-size: 16px;
    line-height: 1.75;
  }

  .quick-answer {
    width: calc(100% - 28px);
    margin-bottom: 48px;
    padding: 24px;
  }

  .content-wrap {
    width: calc(100% - 36px);
    margin-bottom: 64px;
  }

  .content-section {
    padding: 40px 0;
  }

  .section-heading h2 {
    font-size: 26px;
  }

  .faq-item summary {
    padding: 24px 46px 24px 0;
    font-size: 18px;
  }

  .faq-answer {
    padding-right: 0;
  }

  .recommendation-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

}