:root {
  color-scheme: dark;
  --bg: #0a0a0a;
  --surface: #101010;
  --surface-raised: #151515;
  --text: #f2f2f2;
  --muted: #9a9a9a;
  --line: #2a2a2a;
  --line-strong: #3a3a3a;
  --accent: #d0d0d0;
  --accent-soft: #686868;
  --silver: #b8b8b8;
  --danger: #d8d8d8;
  --max: 1180px;
  font-family: Inter, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body { margin: 0; min-width: 320px; min-height: 100vh; background: var(--bg); color: var(--text); }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
::selection { background: var(--accent); color: #0a0a0a; }

.site-shell { overflow: hidden; min-height: 100vh; }
.site-header, footer { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
.site-header { min-height: 88px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 13px; min-height: 44px; }
.brand img { width: 38px; height: 38px; object-fit: contain; }
.brand-name { font-size: 14px; font-weight: 500; letter-spacing: .24em; }
.brand-cn { padding-left: 12px; border-left: 1px solid var(--line-strong); color: var(--muted); font-size: 13px; letter-spacing: .18em; }
nav { display: flex; align-items: center; gap: 32px; color: var(--muted); font-size: 14px; }
nav a { transition: color .2s ease; }
nav a:hover, nav a:focus-visible { color: var(--text); }
.nav-contact { color: var(--accent); }

.hero { position: relative; width: min(calc(100% - 48px), var(--max)); min-height: 690px; margin: 0 auto; padding: 142px 0 96px; }
.hero::before { content: ""; position: absolute; z-index: -1; top: 46px; right: -160px; width: 620px; height: 620px; border: 1px solid #1c1c1c; border-radius: 50%; box-shadow: 0 0 0 86px #0d0d0d, 0 0 0 87px #181818; opacity: .7; }
.axis-mark { position: absolute; right: 112px; top: 150px; width: 270px; height: 270px; opacity: .65; }
.axis-mark::before, .axis-mark::after { content: ""; position: absolute; background: linear-gradient(90deg, transparent, var(--line-strong), transparent); }
.axis-mark::before { left: 0; right: 0; top: 50%; height: 1px; }
.axis-mark::after { top: 0; bottom: 0; left: 50%; width: 1px; background: linear-gradient(180deg, transparent, var(--accent-soft), transparent); }
.axis-mark span { position: absolute; width: 10px; height: 10px; top: calc(50% - 5px); left: calc(50% - 5px); border-radius: 50%; background: var(--accent); box-shadow: 0 0 28px rgba(208,208,208,.38); }
.eyebrow, .section-index, .label { margin: 0 0 24px; color: var(--accent); font-size: 12px; font-weight: 600; letter-spacing: .24em; }
.hero h1 { max-width: 760px; margin: 0; font-size: clamp(52px, 7.3vw, 94px); font-weight: 300; letter-spacing: -.055em; line-height: 1.05; }
.hero h1 span { display: block; color: var(--accent); }
.hero-copy { max-width: 590px; margin: 38px 0 0; color: var(--muted); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; gap: 14px; margin-top: 46px; }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 0 25px; border: 1px solid var(--line-strong); border-radius: 4px; font-size: 14px; letter-spacing: .08em; transition: background .2s ease, border .2s ease, color .2s ease; }
.button-primary { border-color: var(--accent); background: var(--accent); color: #0a0a0a; }
.button-primary:hover { background: #f2f2f2; }
.button-secondary:hover { border-color: var(--silver); background: #141414; }
.signal-line { display: flex; align-items: center; width: 100%; margin-top: 112px; }
.signal-line span { height: 1px; flex: 1; background: var(--line); }
.signal-line i { width: 5px; height: 5px; margin: 0 18px; border: 1px solid var(--accent); border-radius: 50%; }

.product-section, .principles { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 122px 0; border-top: 1px solid var(--line); }
.product-section { --product-accent: #c9b98d; --product-muted: #a8a8a8; }
.product-section .section-heading > p:last-child { color: var(--product-muted); }
.section-heading { display: grid; grid-template-columns: 180px minmax(280px, 1fr) minmax(220px, .7fr); align-items: end; margin-bottom: 54px; }
.section-heading .section-index { align-self: start; }
.section-heading h2 { margin: 0; font-size: clamp(40px, 6vw, 72px); font-weight: 300; letter-spacing: -.045em; }
.section-heading > p:last-child { margin: 0; color: var(--muted); text-align: right; }
.product-panel { display: grid; grid-template-columns: .9fr 1.1fr; min-height: 540px; border: 1px solid #3a3a3a; background: #101010; box-shadow: inset 0 1px rgba(255,255,255,.04); }
.product-visual { position: relative; min-height: 500px; overflow: hidden; border-right: 1px solid #262626; background: radial-gradient(circle at 50% 48%, #292929 0 2%, transparent 2.4%), radial-gradient(circle at 50% 48%, rgba(208,208,208,.055), transparent 42%), #0a0a0a; }
.orbit { position: absolute; inset: 50%; border: 1px solid #292929; border-radius: 50%; transform: translate(-50%, -50%); }
.orbit-one { width: 280px; height: 280px; }
.orbit-two { width: 430px; height: 430px; border-color: #1d1d1d; }
.product-date { position: absolute; inset: 50% auto auto 50%; display: flex; width: 220px; flex-direction: column; align-items: center; transform: translate(-50%, -50%); text-align: center; }
.product-date small { color: var(--muted); letter-spacing: .14em; }
.product-date strong { margin: 14px 0 8px; font-size: 31px; font-weight: 400; }
.product-date span { color: var(--product-accent); font-size: 14px; }
.product-content { padding: clamp(38px, 6vw, 74px); background: linear-gradient(145deg, #101010, #121212); }
.product-content .label { color: var(--product-accent); }
.product-content h3 { max-width: 530px; margin: 0 0 25px; font-size: clamp(30px, 4vw, 48px); font-weight: 300; line-height: 1.35; }
.product-content > p:not(.label) { max-width: 610px; color: var(--product-muted); line-height: 1.9; }
.feature-list { margin: 45px 0 0; padding: 0; list-style: none; }
.feature-list li { display: grid; grid-template-columns: 42px 1fr; gap: 20px; padding: 21px 0; border-top: 1px solid #262626; }
.feature-list li > span { color: var(--product-accent); font: 12px ui-monospace, monospace; }
.feature-list strong { font-size: 15px; font-weight: 500; }
.feature-list p { margin: 7px 0 0; color: var(--product-muted); font-size: 14px; }

.section-heading.compact { grid-template-columns: 180px 1fr; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.principle-grid article { min-height: 250px; padding: 34px; border-right: 1px solid var(--line); background: var(--surface); }
.principle-grid article:last-child { border-right: 0; }
.principle-grid span { color: var(--accent); font: 12px ui-monospace, monospace; }
.principle-grid h3 { margin: 70px 0 14px; font-size: 26px; font-weight: 400; }
.principle-grid p { margin: 0; color: var(--muted); line-height: 1.7; }
.contact-strip { width: min(calc(100% - 48px), var(--max)); margin: 0 auto 120px; padding: 54px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.contact-strip p { margin: 0 0 15px; color: var(--muted); }
.contact-strip a { display: flex; justify-content: space-between; font-size: clamp(25px, 5vw, 56px); font-weight: 300; letter-spacing: -.03em; }
.contact-strip a span { color: var(--accent); }
footer { display: flex; align-items: center; justify-content: space-between; min-height: 130px; border-top: 1px solid var(--line); }
footer > div { display: flex; gap: 28px; color: var(--muted); font-size: 13px; }
footer a:hover { color: var(--text); }

.privacy-page { width: min(calc(100% - 48px), 980px); margin: 0 auto; }
.privacy-header { min-height: 88px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.back-link { color: var(--muted); font-size: 14px; }
.back-link:hover { color: var(--text); }
.privacy-hero { padding: 100px 0 72px; border-bottom: 1px solid var(--line); }
.privacy-hero h1 { margin: 0; font-size: clamp(48px, 8vw, 86px); font-weight: 300; letter-spacing: -.055em; }
.privacy-hero > p:not(.eyebrow) { max-width: 650px; margin: 28px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.policy-meta { display: flex; gap: 28px; margin-top: 34px; color: var(--accent); font: 12px ui-monospace, monospace; letter-spacing: .08em; }
.policy-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 60px; padding: 76px 0 120px; }
.policy-nav { position: sticky; top: 28px; align-self: start; display: flex; flex-direction: column; gap: 15px; color: var(--muted); font-size: 13px; }
.policy-nav a:hover { color: var(--accent); }
.policy-content section { scroll-margin-top: 28px; padding: 0 0 46px; margin: 0 0 46px; border-bottom: 1px solid var(--line); }
.policy-content section:last-child { border-bottom: 0; }
.policy-content h2 { margin: 0 0 20px; font-size: 27px; font-weight: 400; }
.policy-content h3 { margin: 27px 0 10px; font-size: 17px; font-weight: 500; }
.policy-content p, .policy-content li { color: #b1b1b1; line-height: 1.9; }
.policy-content ul { padding-left: 22px; }
.policy-content strong { color: var(--text); font-weight: 500; }
.policy-content a { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
.notice { padding: 24px; border-left: 2px solid var(--accent); background: var(--surface); }
.privacy-footer { display: flex; justify-content: space-between; padding: 34px 0 50px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.noscript { width: min(calc(100% - 48px), 720px); margin: 100px auto; }
.noscript a { color: var(--accent); }

@media (max-width: 820px) {
  .site-header, footer, .hero, .product-section, .principles, .contact-strip, .privacy-page { width: min(calc(100% - 32px), var(--max)); }
  .site-header { min-height: 76px; }
  nav { gap: 18px; }
  nav a:first-child { display: none; }
  .brand-cn { display: none; }
  .hero { min-height: auto; padding: 100px 0 75px; }
  .hero::before { right: -390px; opacity: .45; }
  .axis-mark { display: none; }
  .signal-line { margin-top: 74px; }
  .product-section, .principles { padding: 86px 0; }
  .section-heading, .section-heading.compact { grid-template-columns: 1fr; gap: 16px; }
  .section-heading > p:last-child { text-align: left; }
  .product-panel { grid-template-columns: 1fr; }
  .product-visual { min-height: 390px; border-right: 0; border-bottom: 1px solid var(--line); }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .principle-grid article:last-child { border-bottom: 0; }
  .principle-grid h3 { margin-top: 35px; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 22px; }
  .policy-layout { grid-template-columns: 1fr; gap: 42px; padding-top: 45px; }
  .policy-nav { position: static; display: grid; grid-template-columns: repeat(2, 1fr); padding-bottom: 30px; border-bottom: 1px solid var(--line); }
}

@media (max-width: 520px) {
  .site-header nav a:not(.nav-contact) { display: none; }
  .nav-contact { padding: 9px 12px; border: 1px solid var(--line-strong); }
  .hero { padding-top: 76px; }
  .hero-copy { font-size: 16px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .product-visual { min-height: 330px; }
  .orbit-one { width: 230px; height: 230px; }
  .orbit-two { width: 350px; height: 350px; }
  .product-content { padding: 32px 24px; }
  .contact-strip a { align-items: flex-end; gap: 12px; font-size: 23px; }
  footer > div { align-items: flex-start; flex-direction: column; gap: 10px; }
  .privacy-header .brand-cn { display: none; }
  .policy-meta { flex-direction: column; gap: 8px; }
  .privacy-footer { flex-direction: column; gap: 10px; }
}

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