:root {
  --ink-950: #06121d;
  --ink-900: #081b2b;
  --ink-850: #0c2537;
  --ink-800: #123247;
  --jade-500: #4da49a;
  --jade-300: #91cec3;
  --jade-100: #d8eee9;
  --cloud: #eef7f8;
  --paper: #f8fbfa;
  --gold-500: #b9914e;
  --gold-300: #dcc18b;
  --white: #fff;
  --text: #e9f3f4;
  --text-muted: #adc1c6;
  --dark-text: #122634;
  --dark-muted: #526873;
  --border-light: rgba(190, 225, 224, .18);
  --shadow-lg: 0 28px 80px rgba(0, 12, 22, .26);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --page: min(1180px, calc(100% - 48px));
  --header-height: 80px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--ink-950);
  color: var(--text);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
svg { display: block; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.page-shell { width: var(--page); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 10px 16px; background: var(--white); color: var(--ink-950); border-radius: 0 0 8px 8px; transition: top .2s; }
.skip-link:focus { top: 0; }
:focus-visible { outline: 3px solid var(--gold-300); outline-offset: 4px; }

.scroll-progress { position: fixed; inset: 0 0 auto; height: 2px; z-index: 60; background: rgba(255,255,255,.08); }
.scroll-progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--jade-300), var(--gold-300)); }

.site-header { position: fixed; inset: 0 0 auto; z-index: 50; height: var(--header-height); border-bottom: 1px solid transparent; transition: background .25s var(--ease), border-color .25s var(--ease), backdrop-filter .25s; }
.site-header.is-scrolled { background: rgba(6, 18, 29, .82); border-color: var(--border-light); backdrop-filter: blur(18px); }
.nav-shell { width: var(--page); height: 100%; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 12px; min-height: 48px; }
.brand-seal { display: grid; place-items: center; width: 42px; height: 42px; color: var(--gold-300); border: 1px solid rgba(220,193,139,.7); font-family: "STKaiti", "KaiTi", serif; font-size: 23px; line-height: 1; transform: rotate(45deg); }
.brand-seal b { font-weight: 400; transform: rotate(-45deg); }
.brand-copy { display: grid; line-height: 1.15; }
.brand-copy strong { font-family: "STKaiti", "KaiTi", serif; font-size: 20px; letter-spacing: .18em; }
.brand-copy small { margin-top: 5px; color: var(--text-muted); font-size: 10px; letter-spacing: .4em; text-transform: uppercase; }
.primary-nav { display: flex; align-items: center; gap: 32px; }
.primary-nav a { position: relative; min-height: 44px; display: inline-flex; align-items: center; color: #dbe8ea; font-size: 14px; letter-spacing: .08em; transition: color .2s; }
.primary-nav a:not(.nav-download)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 7px; height: 1px; background: var(--gold-300); transition: right .25s var(--ease); }
.primary-nav a:hover { color: var(--white); }
.primary-nav a:hover::after { right: 0; }
.primary-nav .nav-download { min-height: 42px; padding: 0 18px; border: 1px solid rgba(220,193,139,.55); color: var(--gold-300); }
.primary-nav .nav-download:hover { background: rgba(220,193,139,.12); }
.menu-toggle { display: none; width: 48px; height: 48px; padding: 12px; color: var(--white); border: 0; background: transparent; cursor: pointer; }
.menu-toggle svg { width: 24px; height: 24px; }

.hero { position: relative; min-height: 820px; height: 100svh; max-height: 1020px; overflow: hidden; background: var(--ink-900); }
.hero-image { position: absolute; inset: 0; background: url("assets/hero-qingyun.webp") center center / cover no-repeat; transform: scale(1.02); }
.hero-vignette { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(4,15,26,.93) 0%, rgba(4,15,26,.76) 26%, rgba(4,15,26,.22) 58%, rgba(4,15,26,.1) 100%), linear-gradient(0deg, var(--ink-950) 0%, transparent 22%, rgba(2,10,18,.12) 100%); }
.hero::before { content: ""; position: absolute; inset: 0; z-index: 1; opacity: .18; pointer-events: none; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.14'/%3E%3C/svg%3E"); mix-blend-mode: soft-light; }
.hero-content { position: relative; z-index: 3; height: 100%; display: flex; align-items: center; padding-top: var(--header-height); }
.hero-copy { width: min(610px, 55vw); padding-bottom: 2vh; }
.producer-mark { width: fit-content; display: inline-flex; align-items: center; gap: 16px; margin-bottom: 26px; padding: 11px 16px 11px 18px; color: #f0dfb7; border: 1px solid rgba(220,193,139,.58); background: rgba(7,25,37,.58); box-shadow: inset 0 0 28px rgba(220,193,139,.08), 0 8px 26px rgba(0,0,0,.16); backdrop-filter: blur(8px); font-family: "STKaiti", "KaiTi", serif; letter-spacing: .18em; }
.producer-mark span { color: var(--gold-300); font-size: 26px; font-weight: 700; letter-spacing: .2em; text-shadow: 0 0 18px rgba(220,193,139,.2); }
.producer-mark i { width: 32px; height: 1px; background: linear-gradient(90deg, transparent, var(--gold-300), transparent); }
.producer-mark strong { color: var(--jade-100); font-size: 28px; font-weight: 700; letter-spacing: .2em; text-shadow: 0 0 18px rgba(170,226,210,.2); }
.eyebrow, .section-index { color: var(--gold-300); font-size: 12px; font-weight: 500; letter-spacing: .28em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 12px; }
.eyebrow span { width: 34px; height: 1px; background: var(--gold-300); }
.hero-kicker { margin: 28px 0 0; color: var(--jade-100); font-family: "STKaiti", "KaiTi", serif; font-size: 21px; letter-spacing: .42em; }
.hero h1 { margin: 12px 0 24px; color: var(--white); font-family: "STKaiti", "KaiTi", serif; font-size: clamp(58px, 7vw, 104px); font-weight: 400; line-height: .98; letter-spacing: .04em; text-shadow: 0 10px 40px rgba(0,0,0,.36); }
.hero h1 em { color: var(--gold-300); font-style: normal; }
.hero-lead { max-width: 590px; margin: 0; color: #c5d4d8; font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; gap: 10px; padding: 0 24px; border: 1px solid transparent; font-size: 15px; font-weight: 600; letter-spacing: .06em; cursor: pointer; transition: color .22s, background .22s, border-color .22s, box-shadow .22s, transform .22s var(--ease); }
.button svg { width: 21px; height: 21px; }
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(0); }
.button-primary { color: var(--ink-950); background: linear-gradient(135deg, #e8d4a5, var(--gold-500)); box-shadow: 0 14px 36px rgba(185,145,78,.2); }
.button-primary:hover { box-shadow: 0 18px 44px rgba(185,145,78,.32); }
.button-ghost { color: var(--white); border-color: rgba(255,255,255,.32); background: rgba(5,22,33,.22); backdrop-filter: blur(6px); }
.button-ghost:hover { border-color: var(--jade-300); background: rgba(145,206,195,.1); }
.hero-facts { display: flex; gap: 0; margin: 42px 0 0; }
.hero-facts div { min-width: 132px; padding: 0 24px; border-left: 1px solid rgba(255,255,255,.18); }
.hero-facts div:first-child { padding-left: 0; border-left: 0; }
.hero-facts dt { color: #8fa6ac; font-size: 11px; letter-spacing: .16em; }
.hero-facts dd { margin: 3px 0 0; color: var(--white); font-size: 14px; }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: #73c7a1; box-shadow: 0 0 0 4px rgba(115,199,161,.12); }
.scroll-cue { position: absolute; z-index: 4; left: 50%; bottom: 28px; transform: translateX(-50%); display: grid; place-items: center; min-width: 80px; min-height: 58px; color: rgba(255,255,255,.68); font-size: 10px; letter-spacing: .22em; }
.scroll-cue svg { width: 22px; height: 22px; margin-top: 2px; }
.mist { position: absolute; z-index: 2; width: 55vw; height: 160px; border-radius: 50%; filter: blur(36px); opacity: .12; background: #dff8f6; pointer-events: none; }
.mist-one { left: -20vw; bottom: 6%; }
.mist-two { right: -24vw; bottom: 17%; opacity: .08; }

.section { position: relative; padding: 132px 0; }
.section-heading { max-width: 540px; }
.section-heading h2 { margin: 17px 0 24px; color: inherit; font-family: "STKaiti", "KaiTi", serif; font-size: clamp(42px, 5vw, 68px); font-weight: 400; line-height: 1.14; letter-spacing: .04em; }
.section-heading p { margin: 0; color: inherit; opacity: .7; line-height: 1.9; }
.section-heading.centered { margin: 0 auto 64px; text-align: center; }

.world-section { background: var(--paper); color: var(--dark-text); overflow: hidden; }
.world-section::before { content: "青 云"; position: absolute; left: -10px; top: 8px; color: rgba(10,44,59,.035); font-family: "STKaiti", "KaiTi", serif; font-size: clamp(160px, 23vw, 360px); line-height: 1; white-space: nowrap; pointer-events: none; }
.split-layout { position: relative; display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; align-items: center; }
.world-art { position: relative; min-height: 480px; }
.moon-ring { position: absolute; width: 360px; height: 360px; right: 8%; top: 20px; border: 1px solid rgba(185,145,78,.48); border-radius: 50%; box-shadow: inset 0 0 70px rgba(185,145,78,.08); }
.moon-ring::before { content: ""; position: absolute; inset: 28px; border: 1px solid rgba(77,164,154,.2); border-radius: 50%; }
.mountain-lines { position: absolute; inset: 70px 0 0; width: 100%; height: 410px; color: #3c7d7b; opacity: .48; }
.mountain-lines path { vector-effect: non-scaling-stroke; }
.mountain-lines path:last-child { opacity: .45; }
.world-quote { position: absolute; right: 16%; top: 145px; display: grid; gap: 12px; text-align: center; font-family: "STKaiti", "KaiTi", serif; }
.world-quote span { color: var(--dark-muted); font-size: 14px; letter-spacing: .4em; }
.world-quote strong { font-size: 26px; font-weight: 400; letter-spacing: .2em; writing-mode: vertical-rl; margin-inline: auto; }

.features-section { background: #091b27; color: var(--text); }
.features-section::after { content: ""; position: absolute; inset: 0; opacity: .05; pointer-events: none; background-image: linear-gradient(rgba(255,255,255,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.12) 1px, transparent 1px); background-size: 72px 72px; }
.features-section .page-shell { position: relative; z-index: 1; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { position: relative; min-height: 340px; padding: 40px 34px; overflow: hidden; border: 1px solid var(--border-light); background: linear-gradient(150deg, rgba(255,255,255,.045), rgba(255,255,255,.015)); transition: border-color .25s, background .25s, transform .25s var(--ease); }
.feature-card:hover { transform: translateY(-6px); border-color: rgba(145,206,195,.45); background: linear-gradient(150deg, rgba(145,206,195,.09), rgba(255,255,255,.02)); }
.card-number { position: absolute; right: 24px; top: 15px; color: rgba(255,255,255,.05); font-family: Georgia, serif; font-size: 72px; line-height: 1; }
.feature-icon { display: grid; place-items: center; width: 58px; height: 58px; margin-bottom: 48px; color: var(--gold-300); border: 1px solid rgba(220,193,139,.36); transform: rotate(45deg); }
.feature-icon svg { width: 30px; height: 30px; transform: rotate(-45deg); }
.feature-card h3 { margin: 0 0 14px; font-family: "STKaiti", "KaiTi", serif; font-size: 28px; font-weight: 400; letter-spacing: .1em; }
.feature-card p { margin: 0; color: var(--text-muted); font-size: 15px; }

.guide-section { background: #dfeae7; color: var(--dark-text); }
.guide-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 110px; align-items: start; }
.steps-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(18,50,71,.2); }
.steps-list li { display: grid; grid-template-columns: 84px 1fr; gap: 24px; padding: 32px 0; border-bottom: 1px solid rgba(18,50,71,.2); }
.step-number { color: var(--gold-500); font-family: Georgia, serif; font-size: 14px; letter-spacing: .16em; }
.steps-list h3 { margin: -4px 0 8px; font-family: "STKaiti", "KaiTi", serif; font-size: 25px; font-weight: 400; letter-spacing: .08em; }
.steps-list p { margin: 0; color: var(--dark-muted); }
.steps-list code { padding: 3px 7px; color: #173e4c; background: rgba(77,164,154,.14); border-radius: 4px; font-family: Consolas, monospace; }

.download-section { overflow: hidden; background: radial-gradient(circle at 70% 50%, #164056 0, var(--ink-950) 48%, #040c13 100%); }
.download-glow { position: absolute; width: 600px; height: 600px; right: -180px; top: -180px; border: 1px solid rgba(220,193,139,.12); border-radius: 50%; box-shadow: 0 0 0 80px rgba(220,193,139,.025), 0 0 0 160px rgba(220,193,139,.018); }
.download-panel { position: relative; min-height: 470px; display: grid; grid-template-columns: .72fr 1.28fr; align-items: center; border: 1px solid var(--border-light); background: rgba(7,23,34,.52); backdrop-filter: blur(10px); box-shadow: var(--shadow-lg); }
.download-mark { display: grid; place-items: center; align-self: stretch; color: rgba(220,193,139,.86); border-right: 1px solid var(--border-light); font-family: "STKaiti", "KaiTi", serif; font-size: clamp(130px, 17vw, 240px); text-shadow: 0 0 70px rgba(220,193,139,.16); }
.download-copy { padding: 56px 64px; }
.download-copy h2 { margin: 12px 0 4px; font-family: "STKaiti", "KaiTi", serif; font-size: clamp(40px, 5vw, 64px); font-weight: 400; letter-spacing: .06em; }
.download-copy > p { margin: 0; color: var(--text-muted); }
.download-main { min-width: 250px; }

.site-footer { padding: 48px 0; color: #8fa5ab; background: #030b11; border-top: 1px solid rgba(255,255,255,.06); }
.footer-inner { display: grid; grid-template-columns: auto minmax(0,1fr) auto auto; gap: 36px; align-items: center; }
.footer-brand { color: var(--text); }
.footer-inner p { max-width: 650px; margin: 0; font-size: 12px; line-height: 1.8; }
.footer-inner > a { min-height: 44px; display: inline-flex; align-items: center; color: var(--gold-300); font-size: 13px; }
.footer-signature { display: grid; gap: 2px; padding-left: 20px; border-left: 1px solid rgba(220,193,139,.28); font-family: "STKaiti", "KaiTi", serif; white-space: nowrap; }
.footer-signature strong { color: var(--gold-300); font-size: 20px; font-weight: 600; letter-spacing: .12em; }
.footer-signature span { color: var(--jade-300); font-size: 14px; letter-spacing: .24em; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .65s var(--ease), transform .65s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 960px) {
  :root { --page: min(100% - 40px, 760px); }
  .menu-toggle { display: grid; place-items: center; }
  .primary-nav { position: absolute; left: 20px; right: 20px; top: 72px; display: grid; gap: 0; padding: 10px; background: rgba(6,18,29,.96); border: 1px solid var(--border-light); box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity .2s, transform .2s, visibility .2s; }
  .primary-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .primary-nav a { padding: 0 14px; }
  .primary-nav .nav-download { margin-top: 6px; justify-content: center; }
  .hero { min-height: 760px; }
  .hero-image { background-position: 61% center; }
  .hero-vignette { background: linear-gradient(90deg, rgba(4,15,26,.92), rgba(4,15,26,.54) 70%, rgba(4,15,26,.28)), linear-gradient(0deg, var(--ink-950), transparent 32%); }
  .hero-copy { width: min(620px, 78vw); }
  .split-layout, .guide-layout { grid-template-columns: 1fr; gap: 64px; }
  .world-art { min-height: 390px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: auto; }
  .download-panel { grid-template-columns: .5fr 1.5fr; }
  .download-copy { padding: 48px 38px; }
  .footer-inner { grid-template-columns: 1fr auto auto; }
  .footer-inner p { grid-column: 1 / -1; grid-row: 2; }
}

@media (max-width: 640px) {
  :root { --page: calc(100% - 32px); --header-height: 68px; }
  .brand-seal { width: 36px; height: 36px; font-size: 19px; }
  .brand-copy strong { font-size: 17px; }
  .hero { min-height: 720px; height: 100svh; max-height: 860px; }
  .hero-image { background-position: 66% center; }
  .hero-vignette { background: linear-gradient(90deg, rgba(4,15,26,.88), rgba(4,15,26,.42)), linear-gradient(0deg, var(--ink-950) 0, rgba(4,15,26,.36) 46%, rgba(4,15,26,.18)); }
  .hero-copy { width: 100%; padding-top: 30px; }
  .hero-kicker { margin-top: 20px; font-size: 17px; letter-spacing: .3em; }
  .producer-mark { gap: 10px; margin-bottom: 18px; padding: 9px 12px 9px 14px; letter-spacing: .14em; }
  .producer-mark span { font-size: 21px; letter-spacing: .14em; }
  .producer-mark i { width: 16px; }
  .producer-mark strong { font-size: 22px; letter-spacing: .14em; }
  .hero h1 { margin-top: 10px; font-size: clamp(48px, 16vw, 64px); }
  .hero-lead { max-width: 92%; font-size: 15px; line-height: 1.8; }
  .hero-actions { display: grid; grid-template-columns: 1fr; width: min(100%, 360px); margin-top: 26px; }
  .hero-facts { margin-top: 30px; }
  .hero-facts div { min-width: 0; flex: 1; padding-inline: 12px; }
  .hero-facts dd { font-size: 12px; }
  .scroll-cue { display: none; }
  .section { padding: 88px 0; }
  .section-heading h2 { font-size: 44px; }
  .section-heading.centered { margin-bottom: 42px; text-align: left; }
  .world-art { min-height: 330px; margin-inline: -12px; }
  .moon-ring { width: 280px; height: 280px; right: 2%; }
  .mountain-lines { top: 42px; height: 290px; }
  .world-quote { right: 17%; top: 112px; }
  .feature-card { padding: 34px 28px; }
  .guide-layout { gap: 46px; }
  .steps-list li { grid-template-columns: 52px 1fr; gap: 12px; }
  .download-panel { display: block; }
  .download-mark { min-height: 200px; border-right: 0; border-bottom: 1px solid var(--border-light); font-size: 150px; }
  .download-copy { padding: 36px 22px; }
  .download-copy h2 { font-size: 44px; }
  .download-main { width: 100%; min-width: 0; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .footer-inner p { grid-column: auto; grid-row: auto; }
  .footer-signature { padding-left: 0; border-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}