:root {
  --paper: #f4f1e9;
  --ink: #183b33;
  --accent: #d35f45;
  --sage: #aab8aa;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", STSong, "Noto Serif CJK SC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 400 16px/1.8 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1200px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 8px 16px; color: var(--paper); background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  background: var(--paper);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 14%, transparent);
}
.header-inner { min-height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: flex; align-items: center; gap: 16px; }
.brand-logo { width: 44px; height: 44px; flex: 0 0 auto; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.2; }
.brand-copy strong { font: 600 18px/1.2 var(--serif); letter-spacing: .16em; }
.brand-copy small { margin-top: 4px; opacity: .58; font-size: 10px; letter-spacing: .08em; }
nav { display: flex; align-items: center; gap: 32px; font-size: 13px; font-weight: 500; }
nav a { position: relative; padding: 8px 0; }
nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px; background: var(--accent); transform: scaleX(0); transform-origin: right; transition: transform .24s ease; }
nav a:hover::after, nav a[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
.nav-contact { padding: 10px 16px; color: var(--paper); background: var(--ink); }
.nav-contact::after { display: none; }
.nav-contact:hover { background: var(--accent); }

.hero { min-height: calc(100vh - 80px); padding-top: 96px; border-bottom: 1px solid color-mix(in srgb, var(--ink) 14%, transparent); }
.hero-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 96px; align-items: center; min-height: 560px; }
.eyebrow { display: flex; align-items: center; gap: 12px; margin: 0 0 24px; font-size: 12px; font-weight: 600; letter-spacing: .14em; }
.eyebrow span { width: 32px; height: 1px; background: var(--accent); }
.hero h1 { margin: 0; font: 600 clamp(56px, 6vw, 80px)/1.22 var(--serif); letter-spacing: -.04em; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero-lead { max-width: 640px; margin: 32px 0 0; color: color-mix(in srgb, var(--ink) 72%, transparent); font-size: 18px; line-height: 2; }
.hero-actions { display: flex; align-items: center; gap: 32px; margin-top: 40px; }
.button { display: inline-flex; align-items: center; gap: 32px; padding: 12px 24px; color: var(--paper); background: var(--ink); font-size: 14px; font-weight: 600; transition: background .24s ease, transform .24s ease; }
.button:hover { background: var(--accent); transform: translateY(-2px); }
.button span, .quiet-link span, .contact-detail > a span { transition: transform .24s ease; }
.button:hover span, .quiet-link:hover span, .contact-detail > a:hover span { transform: translate(3px, -2px); }
.quiet-link { display: inline-flex; align-items: center; gap: 24px; padding: 8px 0; border-bottom: 1px solid var(--ink); font-size: 14px; font-weight: 600; }
.hero-signature { justify-self: end; width: 304px; padding: 32px; border: 1px solid color-mix(in srgb, var(--ink) 22%, transparent); }
.signature-ring { width: 192px; height: 192px; display: flex; align-items: center; justify-content: center; gap: 16px; margin: 0 auto 32px; border: 1px solid var(--accent); border-radius: 50%; }
.signature-ring span { font: 600 32px/1 var(--serif); }
.signature-ring i { width: 1px; height: 48px; background: var(--sage); transform: rotate(28deg); }
.hero-signature p { margin: 0 0 16px; font: 500 20px/1.7 var(--serif); }
.hero-signature small { opacity: .5; font-size: 10px; letter-spacing: .14em; }
.hero-index { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 64px; border-top: 1px solid color-mix(in srgb, var(--ink) 14%, transparent); }
.hero-index > div { display: grid; grid-template-columns: 40px 1fr; gap: 4px 16px; padding: 24px 32px; border-right: 1px solid color-mix(in srgb, var(--ink) 14%, transparent); }
.hero-index > div:last-child { border-right: 0; }
.hero-index span { grid-row: 1 / 3; color: var(--accent); font-size: 11px; letter-spacing: .12em; }
.hero-index strong { font: 600 16px/1.4 var(--serif); }
.hero-index small { opacity: .55; font-size: 11px; }
.hero-copy > * { animation: rise .6s ease both; }
.hero-copy > :nth-child(2) { animation-delay: .08s; }
.hero-copy > :nth-child(3) { animation-delay: .16s; }
.hero-copy > :nth-child(4) { animation-delay: .24s; }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.section { padding: 128px 0; scroll-margin-top: 80px; }
.statement { color: var(--paper); background: var(--ink); }
.statement-grid { display: grid; grid-template-columns: .62fr 1.38fr; gap: 96px; }
.statement h2, .section-head h2, .team h2, .study h2, .contact h2, .column-hero h1 { margin: 0; font: 600 clamp(40px, 4.3vw, 56px)/1.4 var(--serif); letter-spacing: -.03em; }
.statement-grid > div > p { max-width: 680px; margin: 32px 0 0; color: color-mix(in srgb, var(--paper) 68%, transparent); font-size: 17px; line-height: 2; }
.section-head { display: grid; grid-template-columns: 1fr .7fr; gap: 96px; align-items: end; margin-bottom: 64px; }
.section-head > p { max-width: 420px; margin: 0 0 8px; opacity: .65; line-height: 1.9; }
.services { background: color-mix(in srgb, var(--paper) 92%, var(--sage)); }
.service-row { display: grid; grid-template-columns: 80px .8fr 1.2fr; gap: 48px; padding: 48px 0; border-top: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.service-row:last-child { border-bottom: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.service-no { padding-top: 8px; color: var(--accent); font-size: 12px; letter-spacing: .16em; }
.service-title p, .profile-role { margin: 0 0 12px; opacity: .55; font-size: 10px; font-weight: 600; letter-spacing: .14em; }
.service-title h3, .profile-list h3 { margin: 0; font: 600 28px/1.5 var(--serif); }
.service-detail > p { max-width: 560px; margin: 0 0 24px; opacity: .72; line-height: 1.9; }
.service-detail ul { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 24px; margin: 0; padding: 0; list-style: none; }
.service-detail li { position: relative; padding-left: 16px; font-size: 14px; }
.service-detail li::before { content: ""; position: absolute; top: .85em; left: 0; width: 5px; height: 5px; background: var(--accent); }
.team { background: var(--paper); }
.profile-list { border-top: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.profile-list article { display: grid; grid-template-columns: 64px .9fr 1.1fr; gap: 48px; align-items: start; padding: 48px 0; border-bottom: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.profile-mark { width: 48px; height: 48px; display: grid; place-items: center; border: 1px solid var(--accent); border-radius: 50%; color: var(--accent); font: 600 18px/1 var(--serif); }
.profile-list article > p { margin: 0; opacity: .68; line-height: 2; }
.approach { background: var(--sage); }
.approach-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 96px; }
.approach-intro h2 { margin: 0; font: 600 clamp(40px, 4.3vw, 56px)/1.4 var(--serif); letter-spacing: -.03em; }
.approach-intro > p:not(.eyebrow) { margin: 32px 0 0; color: color-mix(in srgb, var(--ink) 70%, transparent); font-size: 17px; line-height: 2; }
.approach-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.approach-steps li { display: grid; grid-template-columns: 64px 1fr; gap: 24px; padding: 32px 0; border-bottom: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.approach-steps li > span { padding-top: 4px; color: var(--accent); font-size: 11px; font-weight: 600; letter-spacing: .14em; }
.approach-steps h3 { margin: 0 0 8px; font: 600 24px/1.5 var(--serif); }
.approach-steps p { margin: 0; opacity: .66; line-height: 1.9; }
.study { color: var(--paper); background: var(--ink); }
.study-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 96px; align-items: center; }
.study-image { position: relative; overflow: hidden; min-height: 480px; }
.study-image img { width: 100%; height: 100%; min-height: 480px; object-fit: cover; filter: saturate(.68) contrast(1.04); transition: transform .7s ease; }
.study-image:hover img { transform: scale(1.025); }
.study-image span { position: absolute; right: 0; bottom: 0; padding: 12px 16px; color: var(--ink); background: var(--paper); font-size: 12px; }
.study-copy > p:not(.eyebrow) { margin: 32px 0; color: color-mix(in srgb, var(--paper) 68%, transparent); font-size: 17px; line-height: 2; }
.study .quiet-link { border-color: var(--paper); }
.contact { background: var(--sage); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 96px; }
.contact-detail { padding-top: 56px; }
.contact-detail > p { max-width: 500px; margin: 0 0 24px; opacity: .68; }
.contact-detail > a { display: inline-flex; align-items: center; gap: 24px; padding: 8px 0; border-bottom: 1px solid var(--ink); font: 600 20px/1.5 var(--serif); }
.contact-detail dl { margin: 48px 0 0; border-top: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.contact-detail dl div { display: grid; grid-template-columns: 96px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.contact-detail dt { opacity: .55; font-size: 13px; }
.contact-detail dd { margin: 0; font-size: 14px; font-weight: 500; }
.contact-with-qr { grid-template-columns: .78fr 1.22fr; align-items: center; }
.contact-copy > p:not(.eyebrow) { max-width: 520px; margin: 32px 0; color: color-mix(in srgb, var(--ink) 70%, transparent); font-size: 17px; line-height: 2; }
.contact-copy dl { margin: 40px 0 0; border-top: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.contact-copy dl div { display: grid; grid-template-columns: 80px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.contact-copy dt { opacity: .55; font-size: 13px; }
.contact-copy dd { margin: 0; font-size: 14px; font-weight: 500; }
.contact-copy dd a:hover { color: var(--accent); }
.wecom-card { display: grid; grid-template-columns: 320px 1fr; gap: 32px; align-items: center; padding: 32px; background: var(--paper); }
.qr-frame { width: 320px; height: 320px; overflow: hidden; background: var(--paper); }
.qr-frame img { width: 704px; max-width: none; transform: translate(-192px, -436px); }
.wecom-card > div:last-child > p { margin: 0 0 8px; color: var(--accent); font-size: 11px; font-weight: 600; letter-spacing: .14em; }
.wecom-card h3 { margin: 0 0 16px; font: 600 24px/1.6 var(--serif); }
.wecom-card small { display: block; opacity: .58; font-size: 12px; }
.wecom-card a { display: inline-block; margin-top: 32px; padding-bottom: 4px; border-bottom: 1px solid var(--ink); font-size: 12px; font-weight: 600; }
.wecom-card a:hover { color: var(--accent); border-color: var(--accent); }

.site-footer { padding: 64px 0 24px; color: var(--paper); background: var(--ink); }
.footer-inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; }
.footer-brand { display: flex; align-items: center; gap: 16px; }
.footer-brand img { flex: 0 0 auto; }
.footer-inner strong { font: 600 22px/1 var(--serif); letter-spacing: .16em; }
.footer-inner p { margin: 12px 0 0; opacity: .52; font-size: 12px; }
.footer-links { display: flex; gap: 32px; font-size: 12px; }
.footer-links a:hover { color: var(--accent); }
.notice { width: min(1200px, calc(100% - 64px)); margin: 40px auto 0; padding-top: 16px; border-top: 1px solid color-mix(in srgb, var(--paper) 14%, transparent); color: color-mix(in srgb, var(--paper) 44%, transparent); text-align: center; font-size: 10px; }

/* 桐溪书房 */
.column-hero { padding: 112px 0 80px; border-bottom: 1px solid color-mix(in srgb, var(--ink) 16%, transparent); }
.column-hero h1 { margin-bottom: 16px; }
.column-hero > .container > p:last-child { max-width: 560px; margin: 0; opacity: .65; font-size: 17px; }
.article-list { padding-top: 80px; }
.article-card { display: grid; grid-template-columns: 1.1fr .9fr; border-top: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--ink) 18%, transparent); }
.article-cover { min-height: 440px; overflow: hidden; }
.article-cover img { width: 100%; height: 100%; min-height: 440px; object-fit: cover; filter: saturate(.68); transition: transform .7s ease; }
.article-cover:hover img { transform: scale(1.025); }
.article-summary { padding: 64px; }
.article-summary h2 { margin: 0; font: 600 36px/1.55 var(--serif); }
.article-summary h2 a:hover { color: var(--accent); }
.article-summary > p:not(.eyebrow) { margin: 24px 0; opacity: .68; line-height: 1.9; }
.article-meta { padding-top: 16px; border-top: 1px solid color-mix(in srgb, var(--ink) 16%, transparent); font-size: 12px; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 64px; }
  .hero-signature { justify-self: start; }
  .hero-index { margin-top: 80px; }
  .statement-grid, .study-grid { grid-template-columns: 1fr; gap: 64px; }
  .approach-grid, .contact-with-qr { grid-template-columns: 1fr; gap: 64px; }
  .section-head { grid-template-columns: 1fr; gap: 24px; }
  .service-row { grid-template-columns: 56px 1fr; }
  .service-detail { grid-column: 2; }
  .profile-list article { grid-template-columns: 56px 1fr; }
  .profile-list article > p { grid-column: 2; }
  .article-card { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .container, .notice { width: min(100% - 32px, 1200px); }
  .header-inner { min-height: 72px; }
  .brand-copy small { display: none; }
  nav { gap: 16px; }
  nav a:first-child { display: none; }
  .nav-contact { padding: 8px 12px; }
  .hero { min-height: auto; padding-top: 64px; }
  .hero-grid { gap: 56px; min-height: auto; }
  .hero h1 { font-size: 44px; line-height: 1.3; }
  .hero-lead { font-size: 16px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .hero-signature { width: 100%; padding: 24px; }
  .signature-ring { width: 160px; height: 160px; }
  .hero-index { grid-template-columns: 1fr; margin-top: 64px; }
  .hero-index > div { border-right: 0; border-bottom: 1px solid color-mix(in srgb, var(--ink) 14%, transparent); }
  .hero-index > div:last-child { border-bottom: 0; }
  .section { padding: 88px 0; }
  .statement h2, .section-head h2, .team h2, .study h2, .contact h2, .approach-intro h2, .column-hero h1 { font-size: 36px; }
  .service-row { grid-template-columns: 40px 1fr; gap: 24px; padding: 40px 0; }
  .service-title h3, .profile-list h3 { font-size: 23px; }
  .service-detail ul { grid-template-columns: 1fr; }
  .profile-list article { grid-template-columns: 40px 1fr; gap: 24px; padding: 40px 0; }
  .profile-mark { width: 40px; height: 40px; }
  .study-grid { gap: 48px; }
  .study-image, .study-image img { min-height: 280px; }
  .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .contact-detail { padding-top: 0; }
  .contact-detail > a { font-size: 16px; }
  .contact-with-qr { gap: 48px; }
  .wecom-card { grid-template-columns: 1fr; padding: 24px; }
  .qr-frame { width: 280px; height: 280px; margin-inline: auto; }
  .qr-frame img { width: 616px; transform: translate(-168px, -382px); }
  .footer-inner { align-items: flex-start; flex-direction: column; }
  .footer-links { flex-wrap: wrap; gap: 16px 24px; }
  .column-hero { padding: 80px 0 56px; }
  .article-list { padding-top: 56px; }
  .article-cover, .article-cover img { min-height: 240px; }
  .article-summary { padding: 32px 24px; }
  .article-summary h2 { font-size: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}