:root {
  --ink: #12324f;
  --ink-2: #1b4064;
  --ink-soft: #5b6875;
  --paper: #fbf9f5;
  --paper-2: #f3eee6;
  --line: #e4dccf;
  --accent: #b23a2e;
  --gold: #c9a227;
  --white: #ffffff;
  --radius: 14px;
  --wrap: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3 { margin: 0; line-height: 1.25; font-weight: 700; text-wrap: balance; }
p { margin: 0; }

.wrap { width: min(100% - 48px, var(--wrap)); margin-inline: auto; }

.skip {
  position: absolute; left: -999px; top: 0; padding: 10px 16px;
  background: var(--ink); color: #fff; z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

/* ---------- 占位样式：待填信息 ---------- */
.ph {
  color: #9a6b2f;
  border-bottom: 1px dashed #d8b579;
  font-weight: 600;
  padding-bottom: 1px;
}

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--ink);
  color: rgba(255, 255, 255, .78);
  font-size: 13px;
  letter-spacing: .02em;
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 40px;
}
.topbar-org { color: rgba(255, 255, 255, .92); }
.topbar-links { display: flex; align-items: center; gap: 10px; }
.topbar-item b { color: #fff; font-weight: 600; }
.topbar-link {
  color: #fff; font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, .3);
  padding-bottom: 1px;
  transition: border-color .2s ease;
}
.topbar-link:hover, .topbar-link:focus-visible { border-bottom-color: #fff; }
.topbar-sep { color: rgba(255, 255, 255, .3); }
.topbar .ph { color: #f1d9a8; border-bottom-color: rgba(241, 217, 168, .5); }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 249, 245, .92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 28px;
  min-height: 76px;
}
.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark { width: 40px; height: 40px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 20px; letter-spacing: .08em; }
.brand-text small { font-size: 11px; color: var(--ink-soft); letter-spacing: .18em; }

.nav { display: flex; align-items: center; gap: 26px; margin-left: auto; font-size: 15px; }
.nav a { color: #2c3b4b; padding: 6px 0; position: relative; }
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform .25s ease;
}
.nav a:hover::after, .nav a:focus-visible::after { transform: scaleX(1); }

.nav-toggle {
  display: none; width: 42px; height: 42px; margin-left: auto;
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
  padding: 11px 10px; cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); border-radius: 2px; }
.nav-toggle span + span { margin-top: 5px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; transition: transform .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--ink-2); transform: translateY(-1px); }
.btn-ghost { border-color: #cdc3b3; color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); background: #fff; }
.btn-lg { padding: 15px 30px; font-size: 16px; }
.btn-block { width: 100%; margin-top: 6px; }
.header-cta { flex: none; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(60% 70% at 82% 18%, rgba(201, 162, 39, .13), transparent 62%),
    radial-gradient(55% 60% at 8% 6%, rgba(18, 50, 79, .07), transparent 60%),
    linear-gradient(180deg, #fdfbf7 0%, var(--paper) 100%);
  z-index: -1;
}
.hero-inner {
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 48px; align-items: center;
  padding: 84px 0 92px;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: .22em; color: var(--accent);
  font-weight: 600; margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 26px; height: 1.5px; background: var(--accent); }

.hero h1 {
  font-family: var(--font);
  font-weight: 800;
  font-size: clamp(36px, 4.3vw, 58px);
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--ink);
}
.hero-lead {
  margin-top: 24px; font-size: 17px; color: var(--ink-soft);
  max-width: 34em;
}
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-points {
  display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 34px;
  font-size: 14px; color: #3b4a59;
}
.hero-points li { position: relative; padding-left: 20px; }
.hero-points li::before {
  content: ""; position: absolute; left: 0; top: 50%; width: 8px; height: 8px;
  margin-top: -4px; border-radius: 50%; background: var(--gold);
}

/* Hero 书脊插画 */
.hero-art { position: relative; padding: 10px 0 0; }
.books {
  display: flex; align-items: flex-end; justify-content: center;
  gap: 11px; height: 340px;
}
.book {
  width: 56px; border-radius: 4px 4px 2px 2px;
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 20px; box-shadow: 0 14px 26px -16px rgba(18, 50, 79, .5);
  transform-origin: bottom center;
  transition: transform .3s ease;
}
.book span {
  writing-mode: vertical-rl; text-orientation: upright;
  font-family: var(--serif); font-size: 16px; letter-spacing: .3em;
}
.books:hover .book { transform: translateY(-4px); }
.book:nth-child(2n) { transform: translateY(-10px); }
.b1 { height: 306px; background: var(--ink); } .b1 span { color: #f2e9d8; }
.b2 { height: 262px; background: var(--accent); } .b2 span { color: #ffeee9; }
.b3 { height: 322px; background: var(--gold); } .b3 span { color: #2b2410; }
.b4 { height: 236px; background: #2f5d50; } .b4 span { color: #eaf3ea; }
.b5 { height: 288px; background: #ded3c0; } .b5 span { color: #3a3126; }
.b6 { height: 212px; background: #6b4f3a; } .b6 span { color: #f7ece0; }

.shelf-line {
  height: 10px; border-radius: 3px;
  background: linear-gradient(90deg, rgba(18,50,79,0) 0%, rgba(18,50,79,.16) 12%, rgba(18,50,79,.16) 88%, rgba(18,50,79,0) 100%);
  margin-top: 4px;
}
.art-tag {
  position: absolute; padding: 9px 16px; font-size: 13px; font-weight: 600;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  box-shadow: 0 14px 30px -18px rgba(18, 50, 79, .55); color: #33465a;
}
.art-tag-1 { left: -10px; bottom: 104px; }
.art-tag-2 { right: -8px; bottom: 22px; }
.art-tag::before {
  content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%;
  background: var(--gold); margin-right: 9px; vertical-align: 1px;
}

/* ---------- 信任条 ---------- */
.trust { background: var(--paper-2); border-block: 1px solid var(--line); }
.trust-inner {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 28px; padding: 30px 0;
}
.trust-item { display: flex; gap: 14px; align-items: flex-start; }
.trust-num {
  font-family: var(--serif); font-size: 15px; color: var(--accent);
  letter-spacing: .06em; padding-top: 2px;
}
.trust-item p { font-size: 14px; color: var(--ink-soft); line-height: 1.55; }
.trust-item strong { color: var(--ink); font-size: 15px; }

/* ---------- 通用 section ---------- */
.section { padding: 96px 0; }
.section-head { max-width: 720px; margin-bottom: 52px; }
.section h2 {
  font-family: var(--font);
  font-weight: 800;
  font-size: clamp(26px, 2.8vw, 38px);
  letter-spacing: .01em;
}
.section-lead { margin-top: 16px; color: var(--ink-soft); font-size: 16px; }

/* ---------- 业务范围 ---------- */
.business { background: #fff; }
.cards {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 32px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: #cfc3ae;
  box-shadow: 0 26px 50px -34px rgba(18, 50, 79, .45);
}
.card-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 12px;
  background: var(--ink); margin-bottom: 22px;
}
.card-icon svg {
  width: 24px; height: 24px; fill: none; stroke: #f0e3cb;
  stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
}
.card h3 { font-size: 20px; margin-bottom: 12px; }
.card p { color: var(--ink-soft); font-size: 15px; }
.card-list { margin-top: 18px; display: grid; gap: 8px; }
.card-list li {
  position: relative; padding-left: 18px; font-size: 14px; color: #40505f;
}
.card-list li::before {
  content: ""; position: absolute; left: 2px; top: 12px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--gold);
}

/* ---------- 流程 ---------- */
.process { background: var(--ink); color: #e9e2d5; }
.process .eyebrow { color: #e2b45c; }
.process .eyebrow::before { background: #e2b45c; }
.process h2 { color: #fff; }
.process .section-lead { color: rgba(255, 255, 255, .66); }
.steps {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px;
  counter-reset: step;
}
.steps li {
  position: relative; padding: 26px 22px 24px;
  background: rgba(255, 255, 255, .045);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius);
}
.steps li::after {
  content: ""; position: absolute; top: 34px; right: -10px;
  width: 12px; height: 1px; background: rgba(255, 255, 255, .35);
}
.steps li:last-child::after { display: none; }
.step-no {
  font-family: var(--serif); font-size: 13px; letter-spacing: .16em;
  color: #e2b45c;
}
.steps h3 { font-size: 17px; color: #fff; margin: 10px 0 8px; }
.steps p { font-size: 13.5px; color: rgba(255, 255, 255, .62); line-height: 1.65; }

/* ---------- 服务能力 ---------- */
.why { background: #fff; }
.why-inner { display: grid; grid-template-columns: .85fr 1.15fr; gap: 56px; }
.why-copy h2 { margin-top: 0; }
.why-quote {
  margin: 30px 0 0; padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--paper); border-radius: 0 8px 8px 0;
  font-size: 15px; color: #3c4b59;
}
.why-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.why-tags span {
  font-size: 13px; color: #40505f; background: #fff;
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px;
}
.why-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px 34px;
  padding-top: 6px;
}
.why-item { border-top: 1px solid var(--line); padding-top: 18px; }
.why-item h3 { font-size: 17px; margin-bottom: 8px; }
.why-item p { color: var(--ink-soft); font-size: 14.5px; }

/* ---------- 关于 ---------- */
.about { background: var(--paper-2); }
.about-inner { display: grid; grid-template-columns: 1.25fr .75fr; gap: 56px; }
.about-copy h2 { margin-bottom: 20px; }
.about-copy p + p { margin-top: 14px; }
.about-copy p { color: #3c4b59; font-size: 15.5px; }
.about-facts {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px;
  margin-top: 34px; padding-top: 26px; border-top: 1px solid #ded4c4;
}
.about-facts span { display: block; font-size: 12.5px; color: #8a7860; letter-spacing: .08em; }
.about-facts strong { display: block; margin-top: 6px; font-size: 14.5px; color: var(--ink); word-break: break-all; }
.about-side {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; align-self: start;
}
.about-side h3 { font-size: 17px; margin-bottom: 16px; }
.about-side ul { display: grid; gap: 10px; margin-bottom: 22px; }
.about-side li { position: relative; padding-left: 18px; font-size: 14.5px; color: #40505f; }
.about-side li::before {
  content: ""; position: absolute; left: 2px; top: 11px; width: 6px; height: 6px;
  border-radius: 50%; background: var(--accent);
}

/* ---------- 联系 ---------- */
.contact { background: #fff; }
.contact-inner { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.contact-item {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px;
}
.contact-item span { display: block; font-size: 12.5px; letter-spacing: .12em; color: #8a7860; margin-bottom: 8px; }
.contact-item strong { font-size: 16px; font-weight: 600; }
.contact-item strong a {
  color: inherit; border-bottom: 1px solid rgba(18, 50, 79, .2);
  transition: border-color .2s ease;
}
.contact-item strong a:hover, .contact-item strong a:focus-visible { border-bottom-color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--ink); color: rgba(255, 255, 255, .72); padding: 42px 0 36px; }
.footer-inner { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-brand strong { color: #fff; font-size: 16px; letter-spacing: .04em; }
.footer-brand p { margin-top: 8px; font-size: 13.5px; color: rgba(255, 255, 255, .55); }
.footer-legal { text-align: right; font-size: 13px; }
.footer-legal p + p { margin-top: 8px; }
.footer-legal a { color: rgba(255, 255, 255, .78); border-bottom: 1px solid rgba(255, 255, 255, .25); }
.footer-legal a:hover { color: #fff; }
.footer-sep { margin: 0 8px; color: rgba(255, 255, 255, .3); }
.footer-legal .ph { color: #f1d9a8; border-bottom-color: rgba(241, 217, 168, .45); }

/* ---------- 404 ---------- */
.error-page { padding: 110px 0 130px; background: #fff; }
.error-page h1 { font-size: clamp(28px, 3.4vw, 44px); margin: 8px 0 18px; }
.error-page .section-lead { max-width: 34em; }
.error-page .hero-actions { margin-top: 30px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: 1fr; padding: 60px 0 64px; }
  .hero-art { order: -1; }
  .books { height: 260px; }
  .book { width: 46px; }
  .b1 { height: 233px; } .b2 { height: 199px; } .b3 { height: 245px; }
  .b4 { height: 179px; } .b5 { height: 219px; } .b6 { height: 161px; }
  .art-tag-1 { bottom: 78px; } .art-tag-2 { bottom: 10px; }
  .trust-inner { grid-template-columns: repeat(2, 1fr); }
  .why-inner, .about-inner, .contact-inner { grid-template-columns: 1fr; gap: 36px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps li::after { display: none; }
}

@media (max-width: 820px) {
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 14px 24px 20px; box-shadow: 0 24px 40px -30px rgba(18, 50, 79, .5);
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 10px 0; width: 100%; }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .site-header { position: relative; }
  .cards { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
  .footer-legal { text-align: left; }
  .section { padding: 68px 0; }
}

@media (max-width: 520px) {
  .wrap { width: min(100% - 32px, var(--wrap)); }
  .topbar-inner { flex-direction: column; align-items: flex-start; gap: 2px; padding: 8px 0; }
  .topbar-links { flex-wrap: wrap; }
  .hero h1 { font-size: clamp(32px, 10vw, 40px); }
  .hero-actions .btn { width: 100%; }
  .trust-inner { grid-template-columns: 1fr; gap: 18px; }
  .steps { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .books { gap: 7px; }
  .book { width: 40px; }
  .book span { font-size: 13px; letter-spacing: .18em; }
  .art-tag { font-size: 12px; padding: 7px 12px; }
  .art-tag-1 { left: 0; } .art-tag-2 { right: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}