/* 编辑型排版：两套色系共用。颜色全走 CSS 变量，由 theme-a / theme-b 提供。 */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
}
a { color: inherit; }
.wrap { width: min(1080px, calc(100% - 48px)); margin: 0 auto; }
.wrap-wide { width: min(1200px, calc(100% - 32px)); margin: 0 auto; }

.pick-bar {
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  padding: 10px 16px;
  text-align: center;
}
.pick-bar a { color: #fff; margin: 0 8px; text-underline-offset: 3px; }
.pick-bar .is-here { font-weight: 700; text-decoration: none; }
.trial-bar {
  background: var(--note-bg);
  color: var(--note-ink);
  text-align: center;
  font-size: 12px;
  padding: 7px 16px;
}

.site-header {
  background: var(--nav-bg);
  color: var(--nav-ink);
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
  color: var(--nav-ink);
}
.logo img {
  display: block;
  height: 36px;
  width: 36px;
  object-fit: contain;
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-text strong {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .04em;
}
.logo-text em {
  font-style: normal;
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--mute);
  font-weight: 500;
}
.nav-links { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.nav-links a { color: var(--mute); text-decoration: none; font-size: 14px; }
.nav-links a:hover, .nav-links a.is-on { color: var(--nav-ink); }
.menu-btn { display: none; background: none; border: 1px solid var(--line); color: var(--nav-ink); padding: 6px 10px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 2px;
  text-decoration: none;
  font-size: 14px;
  border: 1px solid transparent;
  font-weight: 600;
}
.btn-main { background: var(--btn); color: var(--btn-ink); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }

.hero {
  padding: 72px 0 0;
}
.hero-grid {
  display: block;
}
.kicker {
  color: var(--mute);
  letter-spacing: .12em;
  font-size: 12px;
  margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(34px, 4.6vw, 52px);
  line-height: 1.18;
  margin: 0 0 22px;
  letter-spacing: -.02em;
  font-weight: 700;
  text-wrap: balance;
}
.hero .lead {
  color: var(--ink);
  max-width: 36em;
  margin: 0;
  font-size: 18px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-photo {
  margin: 36px 0 0;
  overflow: hidden;
}
.hero-photo img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center 38%;
}

.who {
  padding: 8px 0 72px;
}
.who .answer {
  max-width: 40em;
  margin: 0;
  font-size: 20px;
  line-height: 1.7;
  border-left: 2px solid var(--accent);
  padding-left: 20px;
}

.section { padding: 72px 0; }
.section h2 {
  font-size: clamp(26px, 3vw, 36px);
  margin: 0 0 12px;
  line-height: 1.25;
  letter-spacing: -.015em;
  font-weight: 700;
}
.section .sub { color: var(--mute); margin: 0 0 40px; max-width: 36em; }

.steps {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.steps li { margin: 0; }
.steps .n {
  display: block;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: 10px;
  font-weight: 600;
}
.steps h3 { margin: 0 0 8px; font-size: 20px; font-weight: 650; }
.steps p { margin: 0; color: var(--mute); }
.more { margin: 36px 0 0; font-size: 14px; }
.more a { color: var(--ink); }

.bleed {
  padding: 0 0 72px;
}
.bleed figure { margin: 0; }
.bleed img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 2.2 / 1;
  object-fit: cover;
  object-position: center 28%;
}
.bleed figcaption {
  width: min(1080px, calc(100% - 48px));
  margin: 14px auto 0;
  font-size: 13px;
  color: var(--mute);
}

.photos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.photos figure { margin: 0; }
.photos img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  object-position: center 40%;
}
.photos figcaption { padding-top: 10px; font-size: 13px; color: var(--mute); }

.industries {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.industries figure { margin: 0; }
.industries img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
}
.industries figcaption {
  padding: 12px 2px 0;
  font-size: 16px;
  font-weight: 650;
  color: var(--ink);
}
.industries figcaption span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 400;
  color: var(--mute);
}

.case-cards {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 22px;
}
.case-cards article {
  margin: 0;
}
.case-cards a {
  display: block;
  text-decoration: none;
  color: inherit;
}
.case-cards img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}
.case-cards .tag {
  display: block;
  margin: 12px 0 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}
.case-cards h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 650;
}
.case-cards p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

.facts { max-width: 760px; }
.facts dl {
  margin: 0;
}
.facts .row {
  display: grid;
  grid-template-columns: 7em 1fr;
  gap: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.facts .row:last-child { border-bottom: 1px solid var(--line); }
.facts dt { margin: 0; color: var(--mute); font-size: 14px; }
.facts dd { margin: 0; }

.faq { max-width: 760px; }
.faq details {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq p { margin: 10px 0 0; color: var(--mute); }

.close {
  padding: 80px 0 88px;
}
.close h2 { margin: 0 0 12px; font-size: clamp(26px, 3vw, 36px); }
.close p { color: var(--mute); margin: 0 0 24px; max-width: 28em; }

.site-footer {
  background: var(--foot-bg);
  color: var(--foot-ink);
  padding: 40px 0 24px;
  font-size: 13px;
}
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.site-footer a { color: var(--foot-link); text-decoration: none; }
.site-footer h4 { color: var(--foot-title); margin: 0 0 10px; font-weight: 600; }

.page-hero { padding: 56px 0 8px; }
.page-hero h1 {
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1.2;
  letter-spacing: -.015em;
  margin: 0 0 16px;
  font-weight: 700;
}
.page-hero .lead { color: var(--mute); max-width: 38em; margin: 0 0 18px; font-size: 17px; }
.crumb { font-size: 13px; color: var(--mute); margin: 0 0 16px; }
.crumb a { color: var(--ink); text-decoration: none; }
.article { max-width: 720px; }
.article h2 { font-size: 22px; margin: 32px 0 10px; }
.article p { margin: 0 0 14px; }
.answer-box {
  max-width: 40em;
  margin: 0 0 28px;
  font-size: 18px;
  line-height: 1.7;
  border-left: 2px solid var(--accent);
  padding-left: 18px;
}
.stack { max-width: 760px; }
.stack .row {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.stack .row:last-child { border-bottom: 1px solid var(--line); }
.stack .n {
  display: block;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: 6px;
  font-weight: 600;
}
.stack h3 { margin: 0 0 6px; font-size: 18px; }
.stack p { margin: 0; color: var(--mute); }
.stack a { color: var(--ink); }
.split {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 48px;
  align-items: center;
}
.split img { width: 100%; height: auto; display: block; }
.btn-gold { background: var(--btn); color: var(--btn-ink); }
form label { display: block; font-size: 13px; margin: 14px 0 6px; }
form input, form select, form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font: inherit;
  background: #fff;
}
.note { color: var(--mute); font-size: 13px; }
.contact-box {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.contact-box img {
  width: 140px;
  height: 140px;
  display: block;
  border: 1px solid var(--line);
}
.contact-box h3 { margin: 0 0 8px; font-size: 17px; }
.contact-box p { margin: 0 0 6px; color: var(--mute); font-size: 14px; }

@media (max-width: 900px) {
  .hero { padding: 40px 0 8px; }
  .hero-grid, .steps, .photos, .industries, .case-cards, .facts .row, .foot-grid, .split, .contact-box { grid-template-columns: 1fr; }
  .hero-photo img { aspect-ratio: 4 / 3; }
  .industries, .case-cards { grid-template-columns: 1fr 1fr; }
  .logo img { height: 32px; width: 32px; }
  .bleed img { aspect-ratio: 16 / 9; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    left: 0; right: 0; top: 68px;
    background: var(--nav-bg);
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--line);
  }
  .menu-btn { display: inline-flex; }
  .section, .who, .close { padding-top: 48px; padding-bottom: 48px; }
}