/* 极简商务风：白底、细线、衬线标题、大留白 */
:root {
  --paper: #fdfdfb;
  --ink: #1a1a18;
  --soft: #6d6d66;
  --hairline: #e4e2da;
  --brand: #14532d;
  --brand-soft: #eef3ee;
  --maxw: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Georgia", "Times New Roman", "Songti SC", "SimSun", serif;
}

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

.wrap {
  width: min(var(--maxw), calc(100% - 40px));
  margin: 0 auto;
}

.eyebrow {
  display: block;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--brand);
}

h1, h2, h3, p {
  margin: 0;
}

/* 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(253, 253, 251, 0.94);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(8px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.wordmark {
  font-size: 19px;
  letter-spacing: 0.12em;
  font-weight: 700;
}

.wordmark small {
  display: block;
  margin-top: 3px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--soft);
}

.menu {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--soft);
}

.menu a:hover {
  color: var(--ink);
}

/* 首屏：居中极简 */
.opening {
  padding: 110px 0 90px;
  text-align: center;
  border-bottom: 1px solid var(--hairline);
}

.opening h1 {
  margin: 26px auto 0;
  max-width: 780px;
  font-size: clamp(34px, 5.2vw, 58px);
  line-height: 1.18;
  font-weight: 600;
}

.opening .intro {
  margin: 24px auto 0;
  max-width: 620px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 2;
  color: var(--soft);
}

.opening-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 34px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  letter-spacing: 0.1em;
  border: 1px solid var(--ink);
  transition: all 0.2s ease;
}

.btn-solid {
  background: var(--ink);
  color: var(--paper);
}

.btn-solid:hover {
  background: var(--brand);
  border-color: var(--brand);
}

.btn-line:hover {
  background: var(--ink);
  color: var(--paper);
}

/* 三列信任条 */
.assurance {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--hairline);
}

.assurance-item {
  padding: 34px 26px;
  text-align: center;
}

.assurance-item + .assurance-item {
  border-left: 1px solid var(--hairline);
}

.assurance-item strong {
  display: block;
  font-size: 18px;
  letter-spacing: 0.06em;
}

.assurance-item p {
  margin-top: 10px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  line-height: 1.9;
  color: var(--soft);
}

/* 章节 */
.chapter {
  padding: 84px 0;
  border-bottom: 1px solid var(--hairline);
}

.chapter-head {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
  margin-bottom: 48px;
  align-items: start;
}

.chapter-head h2 {
  margin-top: 14px;
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 600;
  line-height: 1.3;
}

.chapter-head .note {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 2.05;
  color: var(--soft);
  max-width: 560px;
  padding-top: 34px;
}

/* 编号服务列表 */
.ledger {
  border-top: 1px solid var(--hairline);
}

.ledger-row {
  display: grid;
  grid-template-columns: 90px 260px 1fr;
  gap: 26px;
  padding: 30px 4px;
  border-bottom: 1px solid var(--hairline);
  align-items: baseline;
}

.ledger-row em {
  font-style: normal;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--brand);
}

.ledger-row h3 {
  font-size: 20px;
  font-weight: 600;
}

.ledger-row p {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14.5px;
  line-height: 2;
  color: var(--soft);
}

/* 双栏卡片（无阴影，仅细线） */
.duet {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.plain-card {
  border: 1px solid var(--hairline);
  padding: 36px;
  background: #fff;
}

.plain-card.tinted {
  background: var(--brand-soft);
  border-color: transparent;
}

.plain-card h3 {
  font-size: 20px;
  font-weight: 600;
}

.plain-card p {
  margin-top: 14px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14.5px;
  line-height: 2;
  color: var(--soft);
}

.plain-card a {
  color: var(--brand);
  border-bottom: 1px solid currentColor;
}

/* 页脚 */
.colophon {
  padding: 56px 0 64px;
}

.colophon-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13.5px;
  line-height: 2.1;
  color: var(--soft);
}

.colophon a {
  color: var(--brand);
}

@media (max-width: 900px) {
  .assurance,
  .duet,
  .colophon-grid,
  .chapter-head {
    grid-template-columns: 1fr;
  }

  .assurance-item + .assurance-item {
    border-left: none;
    border-top: 1px solid var(--hairline);
  }

  .ledger-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .opening {
    padding: 72px 0 60px;
  }

  .chapter {
    padding: 56px 0;
  }

  .chapter-head .note {
    padding-top: 0;
  }

  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 0;
  }
}