:root {
  --ink: #111827;
  --muted: #667085;
  --paper: #f7f8fa;
  --white: #fff;
  --line: #e7e9ef;
  --orange: #ff552f;
  --orange-deep: #df321f;
  --gold: #e5a42e;
  --navy: #131b35;
  --lime: #dff56a;
  --violet: #6b5cff;
  --shadow: 0 20px 60px rgba(20, 28, 55, .1);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site { overflow: hidden; }
.container { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.topbar { border-bottom: 1px solid rgba(231,233,239,.8); font: 12px/1.4 Consolas, "SFMono-Regular", monospace; color: var(--muted); padding: 10px 0; }
.topbar .container { display: flex; justify-content: space-between; gap: 16px; }
.nav { height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 28px; position: relative; z-index: 10; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: -.04em; }
.brand img { width: 40px; height: 40px; object-fit: contain; }
.brand small { display: block; color: var(--muted); font-size: 10px; letter-spacing: .04em; font-weight: 600; margin-top: -3px; }
.nav-links { display: flex; align-items: center; gap: 25px; font-size: 13px; font-weight: 700; color: #5f6674; }
.nav-links a:hover { color: var(--orange); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; border-radius: 999px; padding: 12px 18px; font-size: 13px; font-weight: 800; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 9px 22px rgba(255,85,47,.2); }
.button.primary, .nav-cta { background: var(--orange); color: white; }
.button.ghost { border: 1px solid rgba(255,255,255,.25); color: white; }
.button.light { background: white; color: var(--ink); }
.menu-btn { display: none; border: 0; background: none; font-size: 24px; }
.hero { padding: 70px 0 90px; position: relative; }
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 70px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font: 12px/1.2 Consolas, "SFMono-Regular", monospace; letter-spacing: .08em; text-transform: uppercase; color: var(--orange); font-weight: 500; }
.eyebrow::before { content: ''; width: 28px; height: 1px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-family: "STSong", "Songti SC", "SimSun", serif; letter-spacing: -.08em; line-height: 1.1; font-size: clamp(42px, 6vw, 78px); margin: 22px 0; font-weight: 900; }
h2 { font-family: "STSong", "Songti SC", "SimSun", serif; font-size: clamp(30px, 4vw, 50px); line-height: 1.17; letter-spacing: -.06em; margin-bottom: 18px; }
h3 { letter-spacing: -.04em; line-height: 1.25; }
.lede { color: var(--muted); font-size: 17px; max-width: 580px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-note { display: flex; gap: 18px; margin-top: 30px; color: var(--muted); font-size: 12px; }
.hero-note strong { color: var(--ink); display: block; font-size: 18px; letter-spacing: -.04em; }
.hero-art { position: relative; min-height: 440px; display: flex; align-items: center; justify-content: center; }
.hero-art::before { content: ''; width: 420px; height: 420px; border-radius: 50%; background: linear-gradient(145deg, #ffe1b1, #ff7352); position: absolute; filter: blur(2px); }
.art-card { width: min(420px, 100%); border: 1px solid rgba(255,255,255,.7); border-radius: 28px; overflow: hidden; position: relative; transform: rotate(4deg); box-shadow: var(--shadow); background: #fff; }
.art-card img { width: 100%; height: 470px; object-fit: cover; object-position: top; }
.art-sticker { position: absolute; right: 18px; top: 18px; background: var(--navy); color: var(--lime); font: 11px 'DM Mono', monospace; padding: 9px 11px; border-radius: 8px; transform: rotate(-5deg); }
.section { padding: 100px 0; }
.section.tint { background: #fff; }
.section.dark { background: var(--navy); color: #fff; }
.section.orange { background: var(--orange); color: white; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 42px; }
.section-head p { max-width: 430px; color: var(--muted); margin-bottom: 0; }
.dark .section-head p { color: #a6acc0; }
.orange .section-head p { color: rgba(255,255,255,.78); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card { background: white; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: 0 10px 30px rgba(20,28,55,.035); }
.dark .card { background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.12); box-shadow: none; }
.orange .card { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.22); box-shadow: none; }
.card-kicker { font: 12px 'DM Mono', monospace; color: var(--orange); }
.dark .card-kicker, .orange .card-kicker { color: var(--lime); }
.card h3 { font-size: 22px; margin: 12px 0 10px; }
.card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
.dark .card p, .orange .card p { color: #c5c9d5; }
.number { font: 40px 'DM Mono', monospace; color: var(--orange); line-height: 1; }
.dark .number { color: var(--lime); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; }
.step { border-top: 2px solid var(--orange); padding-top: 18px; position: relative; }
.step::before { counter-increment: step; content: '0' counter(step); font: 12px 'DM Mono', monospace; color: var(--orange); }
.step h3 { font-size: 17px; margin: 18px 0 8px; }
.step p { color: var(--muted); font-size: 13px; margin: 0; }
.quote { border-left: 3px solid var(--orange); padding-left: 24px; font-family: "STSong", "Songti SC", "SimSun", serif; font-size: 24px; letter-spacing: -.04em; }
.quote small { display: block; font: 12px 'DM Mono', monospace; color: var(--muted); margin-top: 14px; }
.metrics { display: flex; flex-wrap: wrap; gap: 50px; margin-top: 35px; }
.metric strong { display: block; font: 38px 'DM Mono', monospace; color: var(--orange); letter-spacing: -.08em; }
.metric span { color: var(--muted); font-size: 12px; }
.visual { border-radius: 30px; overflow: hidden; box-shadow: var(--shadow); background: #eceef3; }
.visual img { width: 100%; height: 520px; object-fit: cover; object-position: top; }
.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: center; }
.pill-row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.pill { background: #f0f1f4; color: #596173; padding: 8px 12px; border-radius: 999px; font-size: 12px; }
.dark .pill { background: rgba(255,255,255,.1); color: #dbe0ed; }
.footer { padding: 30px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer .container { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 18px; }
.legal { padding: 34px 0 80px; }
.legal h1 { font-size: 44px; }
.legal p, .legal li { color: var(--muted); font-size: 14px; }
.legal h2 { font-size: 28px; margin-top: 35px; }
.notice { background: #fff8ee; color: #8a5a10; padding: 15px 18px; border-radius: 14px; font-size: 13px; }
.tag { display: inline-block; padding: 6px 9px; border-radius: 5px; background: #fff0e8; color: var(--orange); font: 11px 'DM Mono', monospace; }
.hero.dark-hero { color: #fff; background: var(--navy); }
.hero.dark-hero .lede, .dark-hero .hero-note { color: #aab0c0; }
.hero.dark-hero h1 { color: #fff; }
.hero.dark-hero .hero-art::before { background: radial-gradient(circle at 35% 30%, #6b5cff, #1d2652 70%); }
.hero.ai-hero { background: linear-gradient(135deg, #f4f1ff, #fff8e9); }
.hero.ai-hero .hero-art::before { background: radial-gradient(circle at 35% 30%, #b3a8ff, #6755ff 72%); }
.hero.opc-hero { background: #e9f0dc; }
.hero.opc-hero .hero-art::before { background: radial-gradient(circle at 35% 30%, #efff93, #78a23b 72%); }
.hero.studio-hero { background: #f9e8df; }
.hero.studio-hero .hero-art::before { background: radial-gradient(circle at 35% 30%, #ffab84, #f2472e 72%); }
.orb-card { width: 350px; height: 350px; border-radius: 50%; background: var(--navy); color: #fff; position: relative; padding: 56px 46px; transform: rotate(-8deg); box-shadow: var(--shadow); }
.orb-card::after { content: 'AI'; position: absolute; right: 25px; bottom: 8px; font: 150px/1 'DM Mono', monospace; color: rgba(255,255,255,.08); }
.orb-card h3 { font-size: 30px; max-width: 200px; position: relative; z-index: 1; }
.orb-card p { color: #b7bed4; position: relative; z-index: 1; font-size: 13px; }
.system-map { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-top: 34px; }
.system-node { padding: 18px 14px; text-align: center; border: 1px solid var(--line); border-radius: 16px; font-size: 12px; background: #fff; }
.system-node strong { display: block; font-size: 17px; margin-bottom: 5px; }
.system-node.active { border-color: var(--orange); background: #fff5ef; color: var(--orange-deep); }
.faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 800; }
.faq p { color: var(--muted); font-size: 13px; padding-top: 10px; margin-bottom: 0; }
@media (max-width: 820px) {
  .container { width: min(100% - 32px, 600px); }
  .topbar { display: none; }
  .nav { height: 68px; }
  .nav-links { display: none; position: absolute; top: 62px; left: 0; right: 0; background: #fff; padding: 18px; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); flex-direction: column; align-items: flex-start; }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; }
  .nav-cta { display: none; }
  .hero { padding: 40px 0 60px; }
  .hero-grid, .split { grid-template-columns: 1fr; gap: 35px; }
  h1 { font-size: clamp(40px, 12vw, 65px); }
  .hero-art { min-height: 340px; }
  .hero-art::before { width: 300px; height: 300px; }
  .art-card { width: min(330px, 90%); }
  .art-card img { height: 390px; }
  .section { padding: 70px 0; }
  .section-head { display: block; margin-bottom: 28px; }
  .section-head p { margin-top: 12px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .visual img { height: 400px; }
  .system-map { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 460px) {
  .steps { grid-template-columns: 1fr; }
  .hero-note { gap: 12px; }
  .orb-card { width: 280px; height: 280px; padding: 44px 34px; }
  .orb-card h3 { font-size: 24px; }
}