:root {
  --paper: #f6f0e5;
  --paper-deep: #eee5d6;
  --surface: rgba(255, 253, 248, 0.82);
  --ink: #153f36;
  --ink-soft: #49685f;
  --muted: #738b83;
  --line: rgba(21, 63, 54, 0.17);
  --coral: #ef6b4b;
  --mint: #45bba5;
  --gold: #efa733;
  --night: #f06b4d;
  --words: #45bba5;
  --aibao: #efa733;
  --shadow: 0 24px 70px rgba(37, 55, 45, 0.1);
  --serif: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  --sans: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 7%, rgba(239, 107, 75, 0.09), transparent 26rem),
    radial-gradient(circle at 93% 15%, rgba(69, 187, 165, 0.1), transparent 28rem),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button { font: inherit; }
.skip-link { position: fixed; top: -80px; left: 20px; z-index: 100; padding: 10px 16px; background: var(--ink); color: white; border-radius: 8px; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  padding: 0 5vw;
  background: rgba(246, 240, 229, 0.88);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.site-header.is-scrolled { border-color: var(--line); box-shadow: 0 8px 30px rgba(21, 63, 54, 0.05); }
.wordmark { display: inline-grid; line-height: 1; gap: 5px; }
.wordmark-cn { font: 30px/1 var(--serif); letter-spacing: 0.12em; }
.wordmark-en { font: 700 9px/1 var(--sans); letter-spacing: 0.32em; color: var(--ink-soft); }
.site-nav { display: flex; align-items: center; gap: clamp(18px, 2.6vw, 38px); font-size: 14px; font-weight: 700; }
.site-nav a { position: relative; }
.site-nav a:not(.studio-link)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -7px; height: 1px; background: var(--coral); transition: right 0.2s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.studio-link { padding: 9px 15px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); }
.menu-button { display: none; color: var(--ink); border: 1px solid var(--line); background: rgba(255,255,255,.46); border-radius: 999px; padding: 8px 14px; }

.hero {
  width: min(1380px, 92vw);
  min-height: calc(100vh - 82px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(430px, .86fr);
  align-items: center;
  gap: clamp(40px, 7vw, 112px);
  padding: 80px 0 110px;
}
.hero-copy { max-width: 720px; }
.eyebrow { margin: 0 0 18px; color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: .24em; }
.hero h1, .section-heading h2, .about-card h2 { margin: 0; font-family: var(--serif); font-weight: 500; letter-spacing: .02em; }
.hero h1 { font-size: clamp(48px, 6vw, 88px); line-height: 1.1; }
.hero h1 em { color: var(--coral); font-style: normal; }
.hero-lead { max-width: 650px; margin: 32px 0 0; color: var(--ink-soft); font-size: clamp(16px, 1.4vw, 20px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 38px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 0 23px; border-radius: 999px; font-size: 14px; font-weight: 800; }
.button-primary { background: var(--ink); color: #fffdf8; box-shadow: 0 12px 30px rgba(21,63,54,.18); }
.button-primary:hover { transform: translateY(-2px); }
.button-quiet { border: 1px solid var(--line); background: rgba(255,255,255,.45); }
.hero-note { display: flex; gap: 10px; align-items: center; margin-top: 34px; color: var(--ink); font-family: var(--serif); font-size: 18px; letter-spacing: .08em; }
.hero-note span { color: var(--coral); }

.hero-orbit {
  position: relative;
  width: min(100%, 590px);
  aspect-ratio: 1;
  margin: auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.72) 0 22%, transparent 23%), repeating-radial-gradient(circle, transparent 0 34%, rgba(21,63,54,.055) 34.2% 34.5%, transparent 34.8% 54%);
}
.hero-orbit::before, .hero-orbit::after { content: ""; position: absolute; inset: 8%; border: 1px dashed rgba(21,63,54,.13); border-radius: 50%; transform: rotate(18deg); }
.hero-orbit::after { inset: 26%; transform: none; }
.orbit-center { position: absolute; inset: 50% auto auto 50%; width: 160px; height: 160px; transform: translate(-50%, -50%); display: grid; place-content: center; text-align: center; border: 1px solid var(--line); border-radius: 50%; background: #fffcf6; box-shadow: var(--shadow); }
.orbit-center strong { font: 33px/1 var(--serif); letter-spacing: .12em; }
.orbit-center span { margin-top: 10px; color: var(--ink-soft); font-size: 9px; letter-spacing: .22em; }
.orbit-card { position: absolute; width: 164px; padding: 14px; display: flex; align-items: center; gap: 12px; background: rgba(255,253,248,.94); border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 17px 48px rgba(21,63,54,.1); transition: transform .22s ease, box-shadow .22s ease; }
.orbit-card:hover { transform: translateY(-5px); box-shadow: 0 24px 55px rgba(21,63,54,.15); }
.orbit-card img { width: 56px; height: 56px; object-fit: contain; border-radius: 14px; }
.orbit-card span { display: grid; gap: 2px; }
.orbit-card strong { font-family: var(--serif); font-size: 18px; }
.orbit-card small { color: var(--muted); font-size: 11px; }
.orbit-night { top: 3%; left: 6%; border-top: 3px solid var(--night); }
.orbit-words { top: 34%; right: -6%; border-top: 3px solid var(--words); }
.orbit-aibao { left: 12%; bottom: 1%; border-top: 3px solid var(--aibao); }

.quick-answer { width: min(1080px, 88vw); margin: -35px auto 0; padding: 19px 24px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,253,248,.58); color: var(--ink-soft); text-align: center; }
.quick-answer p { margin: 0; }
.quick-answer strong { color: var(--ink); }

.section { width: min(1280px, 88vw); margin: 0 auto; padding: 135px 0; }
.section-heading { max-width: 780px; margin-bottom: 58px; }
.section-heading.compact { max-width: 720px; }
.section-heading h2, .about-card h2 { font-size: clamp(38px, 4.8vw, 64px); line-height: 1.18; }
.section-heading > p:last-child { max-width: 670px; margin: 22px 0 0; color: var(--ink-soft); font-size: 17px; }

.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.product-card { position: relative; display: flex; flex-direction: column; min-height: 650px; padding: 28px; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-top: 5px solid var(--card-accent); border-radius: 30px; box-shadow: 0 18px 55px rgba(21,63,54,.07); }
.product-card::after { content: ""; position: absolute; width: 200px; height: 200px; top: 95px; right: -95px; border-radius: 50%; background: var(--card-accent); opacity: .08; }
.product-night { --card-accent: var(--night); }
.product-words { --card-accent: var(--words); }
.product-aibao { --card-accent: var(--aibao); }
.product-topline { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.product-topline span:first-child { color: var(--card-accent); font-size: 14px; }
.product-logo { width: 104px; height: 104px; object-fit: contain; margin-top: 45px; filter: drop-shadow(0 12px 16px rgba(21,63,54,.12)); }
.product-kicker { margin: 27px 0 6px; color: var(--muted); font-size: 9px; letter-spacing: .16em; }
.product-card h3 { margin: 0; font: 500 44px/1.2 var(--serif); }
.product-tagline { margin: 8px 0 0; color: var(--card-accent); font-weight: 800; }
.product-description { margin: 24px 0 0; color: var(--ink-soft); }
.product-card ul { margin: 20px 0 30px; padding-left: 18px; color: var(--ink-soft); font-size: 14px; }
.product-card li + li { margin-top: 7px; }
.product-card li::marker { color: var(--card-accent); }
.product-cta { margin-top: auto; display: flex; justify-content: space-between; align-items: center; min-height: 51px; padding: 0 18px; border-radius: 14px; background: color-mix(in srgb, var(--card-accent) 12%, white); color: var(--ink); font-size: 14px; font-weight: 800; }

.philosophy-section { border-top: 1px solid var(--line); }
.belief-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: 28px; overflow: hidden; background: rgba(255,253,248,.5); }
.belief-grid article { min-height: 300px; padding: clamp(28px, 4vw, 52px); }
.belief-grid article + article { border-left: 1px solid var(--line); }
.belief-number { color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: .15em; }
.belief-grid h3 { margin: 65px 0 14px; font: 500 30px/1.2 var(--serif); }
.belief-grid p { margin: 0; color: var(--ink-soft); }

.chooser-section { padding-top: 30px; }
.chooser-list { border-top: 1px solid var(--line); }
.chooser-list a { display: grid; grid-template-columns: 14px 1fr auto; align-items: center; gap: 20px; min-height: 96px; border-bottom: 1px solid var(--line); transition: padding .2s ease, background .2s ease; }
.chooser-list a:hover { padding: 0 18px; background: rgba(255,255,255,.33); }
.chooser-list strong { font: 500 clamp(20px, 2.5vw, 31px)/1.3 var(--serif); }
.chooser-list em { color: var(--muted); font-style: normal; font-size: 13px; font-weight: 800; }
.chooser-dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-night { background: var(--night); }.dot-words { background: var(--words); }.dot-aibao { background: var(--aibao); }

.about-card { padding: clamp(35px, 6vw, 78px); display: grid; grid-template-columns: 1fr .86fr; gap: 8vw; background: var(--ink); color: #f9f4e9; border-radius: 36px; box-shadow: var(--shadow); }
.about-card .eyebrow { color: #f6a18b; }
.about-copy { align-self: end; color: rgba(249,244,233,.76); }
.about-copy p { margin: 0 0 18px; }
.about-copy a { display: inline-flex; margin-top: 16px; color: #fff; font-weight: 800; border-bottom: 1px solid rgba(255,255,255,.36); }

.social-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.social-grid article { min-height: 250px; padding: 28px; border: 1px solid var(--line); border-radius: 24px; background: rgba(255,253,248,.55); }
.social-grid article > span { display: inline-flex; padding: 5px 10px; background: rgba(21,63,54,.07); border-radius: 999px; color: var(--ink-soft); font-size: 11px; font-weight: 800; }
.social-grid h3 { margin: 45px 0 10px; font: 500 26px/1.2 var(--serif); }
.social-grid p { color: var(--ink-soft); font-size: 14px; }
.social-grid small { color: var(--coral); font-weight: 800; }

.faq-section { padding-top: 40px; }
.faq-list { max-width: 930px; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); padding: 24px 0; }
.faq-list summary { cursor: pointer; list-style: none; font: 500 23px/1.4 var(--serif); }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; float: right; color: var(--coral); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list p { max-width: 700px; margin: 16px 0 0; color: var(--ink-soft); }

.site-footer { margin-top: 60px; padding: 70px 6vw 35px; display: grid; grid-template-columns: 1fr auto; gap: 55px; background: #10372f; color: #f7f1e6; }
.footer-branding { display: grid; width: fit-content; }
.footer-branding strong { font: 500 40px/1 var(--serif); letter-spacing: .13em; }
.footer-branding span { margin-top: 8px; font-size: 10px; letter-spacing: .28em; color: rgba(255,255,255,.65); }
.footer-branding p { margin: 24px 0 0; color: #f3a48d; font-family: var(--serif); letter-spacing: .08em; }
.site-footer nav { display: grid; grid-template-columns: repeat(2, auto); align-content: start; gap: 16px 40px; color: rgba(255,255,255,.74); font-size: 14px; }
.site-footer nav a:hover { color: #fff; }
.copyright { grid-column: 1 / -1; margin: 0; padding-top: 28px; border-top: 1px solid rgba(255,255,255,.13); color: rgba(255,255,255,.48); font-size: 11px; }

@media (max-width: 1050px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy { max-width: 800px; }
  .hero-orbit { width: min(620px, 84vw); }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: auto; }
  .product-logo { margin-top: 35px; }
  .belief-grid, .social-grid { grid-template-columns: 1fr; }
  .belief-grid article { min-height: 230px; }
  .belief-grid article + article { border-left: 0; border-top: 1px solid var(--line); }
  .belief-grid h3 { margin-top: 40px; }
  .about-card { grid-template-columns: 1fr; gap: 45px; }
}

@media (max-width: 760px) {
  .site-header { min-height: 70px; padding: 0 20px; }
  .wordmark-cn { font-size: 25px; }
  .menu-button { display: block; }
  .site-nav { position: absolute; top: 70px; left: 14px; right: 14px; display: none; padding: 20px; flex-direction: column; align-items: stretch; gap: 0; background: #fbf7ef; border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 5px; }
  .site-nav .studio-link { margin-top: 8px; text-align: center; }
  .hero { width: min(90vw, 650px); padding: 65px 0 95px; gap: 68px; }
  .hero h1 { font-size: clamp(42px, 13vw, 64px); }
  .hero-orbit { width: min(440px, 90vw); margin-left: -1vw; }
  .orbit-center { width: 118px; height: 118px; }
  .orbit-center strong { font-size: 25px; }
  .orbit-card { width: 128px; padding: 9px; gap: 7px; border-radius: 18px; }
  .orbit-card img { width: 43px; height: 43px; border-radius: 11px; }
  .orbit-card strong { font-size: 14px; }
  .orbit-card small { font-size: 9px; }
  .orbit-words { right: -3%; }
  .quick-answer { margin-top: 0; text-align: left; }
  .section { width: 90vw; padding: 95px 0; }
  .section-heading { margin-bottom: 40px; }
  .section-heading h2, .about-card h2 { font-size: clamp(34px, 10vw, 48px); }
  .product-card { padding: 23px; border-radius: 24px; }
  .chooser-list a { grid-template-columns: 12px 1fr; gap: 13px; padding: 17px 0; }
  .chooser-list a:hover { padding: 17px 8px; }
  .chooser-list em { grid-column: 2; }
  .site-footer { grid-template-columns: 1fr; padding: 60px 24px 30px; }
  .copyright { grid-column: 1; }
}

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