:root {
  --ink: #101118;
  --ink-soft: #171821;
  --paper: #f5f5f8;
  --white: #fff;
  --muted: #686a75;
  --line: #d9dae1;
  --dark-line: rgba(255,255,255,.14);
  --purple: #6754f7;
  --purple-light: #aaa0ff;
  --purple-pale: #e5e1ff;
  --shell: 1240px;
  --ease: cubic-bezier(.2,.75,.2,1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei","PingFang SC",Arial,sans-serif; -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { max-width: 100%; height: auto; }
[id] { scroll-margin-top: 88px; }
.shell { width: min(calc(100% - 48px),var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 999; top: 8px; left: 8px; padding: 10px 14px; color: #fff; background: var(--purple); transform: translateY(-140%); }
.skip-link:focus { transform: none; }
.reading-progress { position: fixed; z-index: 200; inset: 0 auto auto 0; width: 0; height: 3px; background: var(--purple); }

/* Header */
.site-header { position: fixed; z-index: 90; inset: 0 0 auto; color: #fff; border-bottom: 1px solid rgba(255,255,255,.13); background: rgba(16,17,24,.12); transition: color .25s,background .25s,box-shadow .25s; }
.site-header.scrolled { color: var(--ink); background: rgba(255,255,255,.95); box-shadow: 0 12px 40px rgba(10,10,25,.08); backdrop-filter: blur(14px); }
.header-inner { height: 80px; display: flex; align-items: center; gap: 54px; }
.brand { width: 112px; display: inline-flex; }
.site-header:not(.scrolled) .brand img { filter: brightness(0) invert(1); }
.desktop-nav { display: flex; gap: 30px; align-items: center; margin-left: auto; }
.desktop-nav a { position: relative; font-size: 11px; }
.desktop-nav a::after { content: ""; position: absolute; inset: auto 0 -9px; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform .25s; }
.desktop-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.header-actions { display: flex; align-items: center; gap: 18px; }
.header-contact { min-height: 38px; display: inline-flex; align-items: center; padding: 0 20px; color: var(--ink); background: #fff; font-size: 11px; font-weight: 700; }
.site-header.scrolled .header-contact { color: #fff; background: var(--purple); }
.menu-toggle { width: 38px; height: 38px; display: none; position: relative; border: 0; color: inherit; background: transparent; cursor: pointer; }
.menu-toggle span { position: absolute; left: 8px; width: 22px; height: 1px; background: currentColor; transition: transform .2s,top .2s; }
.menu-toggle span:first-child { top: 14px; }
.menu-toggle span:last-child { top: 22px; }
.menu-toggle[aria-expanded="true"] span:first-child { top: 18px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { top: 18px; transform: rotate(-45deg); }
.mobile-menu { position: fixed; z-index: 89; inset: 68px 0 0; padding: 30px 24px; color: var(--ink); background: rgba(255,255,255,.98); overflow: auto; }
.mobile-menu a { display: block; padding: 17px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.mobile-menu-contact { margin-top: 24px; padding: 16px !important; color: #fff; border: 0 !important; background: var(--purple); text-align: center; }

/* Common */
.section { padding: 120px 0; }
.section-kicker,.eyebrow { margin: 0; color: var(--purple); font: 8px Arial,sans-serif; letter-spacing: .17em; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 28px; padding: 0 24px; border: 0; font-size: 11px; font-weight: 700; transition: transform .2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--purple); }

/* Hero */
.hero { min-height: 100vh; position: relative; overflow: hidden; padding: 135px 0 0; color: #fff; background: var(--ink); }
.hero::before { content: ""; position: absolute; top: -25%; right: -9%; width: 58vw; height: 58vw; border-radius: 50%; background: radial-gradient(circle,rgba(103,84,247,.4),transparent 67%); }
.hero-grid,.final-grid { position: absolute; inset: 0; opacity: .28; background-image: linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px); background-size: 74px 74px; mask-image: linear-gradient(to bottom,#000,transparent 87%); }
.hero-layout { position: relative; z-index: 1; display: grid; grid-template-columns: 1.02fr .98fr; gap: 76px; align-items: center; }
.breadcrumb { display: flex; gap: 10px; margin-bottom: 46px; color: rgba(255,255,255,.45); font-size: 9px; }
.breadcrumb b { color: rgba(255,255,255,.72); font-weight: 400; }
.eyebrow { display: flex; align-items: center; gap: 12px; color: var(--purple-light); }
.eyebrow i { width: 25px; height: 1px; background: var(--purple-light); }
.hero h1 { margin: 24px 0 0; font-size: clamp(48px,5.2vw,73px); line-height: 1.14; letter-spacing: -.055em; }
.hero h1 em { color: var(--purple-light); font-style: normal; }
.hero-slogan { margin: 27px 0 0; font-size: 23px; font-weight: 700; }
.hero-lead { max-width: 620px; margin: 18px 0 0; color: rgba(255,255,255,.58); font-size: 14px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 34px; }
.text-link { padding-bottom: 6px; border-bottom: 1px solid rgba(255,255,255,.35); font-size: 11px; }
.text-link span { margin-left: 14px; color: var(--purple-light); }
.hero-meta { display: flex; margin: 40px 0 0; }
.hero-meta div { min-width: 130px; padding-left: 17px; border-left: 1px solid rgba(255,255,255,.18); }
.hero-meta dt { color: rgba(255,255,255,.34); font: 7px Arial,sans-serif; letter-spacing: .15em; }
.hero-meta dd { margin: 9px 0 0; color: rgba(255,255,255,.78); font-size: 10px; }
.hero-visual { margin: 0; border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.035); box-shadow: 27px 27px 0 rgba(103,84,247,.14); }
.hero-visual img { width: 100%; display: block; }
.hero-visual figcaption { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 17px 23px; border-top: 1px solid rgba(255,255,255,.15); }
.hero-visual figcaption span { color: var(--purple-light); font: 8px Arial,sans-serif; letter-spacing: .12em; }
.hero-visual figcaption b { font-size: 11px; }
.hero-topics { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(3,1fr); margin-top: 62px; border-top: 1px solid rgba(255,255,255,.12); }
.hero-topics > span { min-height: 82px; display: grid; grid-template-columns: 30px 1fr; align-content: center; gap: 5px 10px; padding: 14px 22px; border-left: 1px solid rgba(255,255,255,.12); }
.hero-topics > span:last-child { border-right: 1px solid rgba(255,255,255,.12); }
.hero-topics small { grid-row: 1 / 3; align-self: center; color: var(--purple-light); font: 8px Arial,sans-serif; }
.hero-topics b { font-size: 12px; }
.hero-topics em { color: rgba(255,255,255,.35); font: 7px Arial,sans-serif; font-style: normal; letter-spacing: .12em; }

/* Library */
.library { background: #fff; }
.section-heading { display: grid; grid-template-columns: 1fr 360px; gap: 90px; align-items: end; margin-bottom: 60px; }
.section-heading h2 { margin: 18px 0 0; font-size: clamp(39px,4.2vw,55px); line-height: 1.3; letter-spacing: -.05em; }
.section-heading > p { margin: 0 0 7px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.library-toolbar { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 30px; margin-bottom: 34px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); }
.filter-group { display: flex; gap: 6px; }
.filter-button { min-height: 38px; padding: 0 16px; border: 1px solid transparent; color: var(--muted); background: transparent; font-size: 11px; cursor: pointer; transition: color .2s,border .2s,background .2s; }
.filter-button span { margin-left: 7px; color: #aaa; font: 8px Arial,sans-serif; }
.filter-button:hover { color: var(--ink); }
.filter-button.active { color: #fff; border-color: var(--purple); background: var(--purple); }
.filter-button.active span { color: rgba(255,255,255,.7); }
.result-count { margin: 0; color: var(--muted); font: 8px Arial,sans-serif; letter-spacing: .13em; }
.result-count b { margin-right: 6px; color: var(--purple); font-size: 12px; }
.resource-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; align-items: stretch; }
.resource-card { min-width: 0; border: 1px solid var(--line); background: var(--paper); transition: opacity .25s,transform .25s,border-color .25s; }
.resource-card[hidden] { display: none; }
.resource-card:hover { z-index: 1; border-color: var(--purple); transform: translateY(-4px); }
.resource-card > a { height: 100%; display: flex; flex-direction: column; }
.resource-cover { aspect-ratio: 1.2 / 1; overflow: hidden; border-bottom: 1px solid var(--line); background: var(--ink); }
.resource-cover img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .4s var(--ease); }
.resource-card:hover .resource-cover img { transform: scale(1.025); }
.resource-copy { flex: 1; display: flex; flex-direction: column; padding: 25px 24px 22px; }
.resource-topline { display: flex; justify-content: space-between; gap: 15px; color: var(--purple); font: 8px Arial,sans-serif; letter-spacing: .12em; }
.resource-topline small { color: #999aa4; font-size: 8px; }
.resource-card h3 { margin: 45px 0 16px; font-size: 23px; line-height: 1.42; letter-spacing: -.03em; }
.resource-card p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.resource-bottom { display: flex; justify-content: space-between; align-items: center; gap: 15px; margin-top: auto; padding-top: 32px; color: #94959e; font-size: 9px; }
.resource-bottom b { color: var(--purple); font-size: 10px; }
.resource-card.featured { grid-column: span 2; }
.resource-card.featured > a { display: grid; grid-template-columns: 1.18fr .82fr; }
.resource-card.featured .resource-cover { min-height: 440px; aspect-ratio: auto; border-right: 1px solid var(--line); border-bottom: 0; }
.resource-card.featured .resource-copy { padding: 32px 30px 27px; }
.resource-card.featured h3 { margin-top: 75px; font-size: 31px; }
.resource-card.featured p { font-size: 13px; }

/* Guide */
.guide { color: #fff; background: var(--ink-soft); }
.guide-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 100px; }
.guide-heading .section-kicker { color: var(--purple-light); }
.guide-heading h2 { margin: 20px 0 0; font-size: clamp(39px,4.1vw,54px); line-height: 1.3; letter-spacing: -.05em; }
.guide-heading > p:last-child { max-width: 500px; margin: 30px 0 0; color: rgba(255,255,255,.5); font-size: 13px; line-height: 1.9; }
.guide-steps { margin: 0; padding: 0; border-top: 1px solid var(--dark-line); list-style: none; }
.guide-steps li { min-height: 185px; display: grid; grid-template-columns: 60px 1fr; padding: 29px 0; border-bottom: 1px solid var(--dark-line); }
.guide-steps li > span { color: var(--purple-light); font: 9px Arial,sans-serif; }
.guide-steps small { color: rgba(255,255,255,.3); font: 8px Arial,sans-serif; letter-spacing: .13em; }
.guide-steps h3 { margin: 14px 0 12px; font-size: 22px; }
.guide-steps p { max-width: 560px; margin: 0; color: rgba(255,255,255,.5); font-size: 12px; line-height: 1.8; }

/* CTA and footer */
.final-cta { position: relative; overflow: hidden; padding: 110px 0; color: #fff; background: var(--purple); }
.final-grid { opacity: .4; mask-image: none; }
.final-layout { position: relative; z-index: 1; display: grid; grid-template-columns: 1.25fr .75fr; gap: 90px; align-items: end; }
.final-layout small { color: rgba(255,255,255,.55); font: 8px Arial,sans-serif; letter-spacing: .15em; }
.final-layout h2 { margin: 19px 0 0; font-size: clamp(41px,4.5vw,59px); line-height: 1.25; letter-spacing: -.05em; }
.final-layout p { margin: 0 0 28px; color: rgba(255,255,255,.72); font-size: 14px; line-height: 1.85; }
.button-white { color: var(--ink); background: #fff; }
.site-footer { padding: 68px 0 0; background: #f0f1f5; }
.footer-main { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; padding-bottom: 55px; }
.footer-brand img { width: 116px; }
.footer-brand p { max-width: 350px; margin: 24px 0 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.footer-nav { display: grid; grid-template-columns: repeat(3,1fr); gap: 35px; }
.footer-nav div { display: flex; flex-direction: column; gap: 12px; font-size: 11px; }
.footer-nav b { margin-bottom: 8px; font-size: 12px; }
.footer-nav a { color: var(--muted); }
.footer-nav a:hover { color: var(--purple); }
.footer-bottom { min-height: 70px; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.footer-bottom span:last-child { display: flex; gap: 20px; }
.mobile-contact { display: none; }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease),transform .7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 1040px) {
  .desktop-nav { gap: 20px; }
  .hero-layout { gap: 42px; }
  .resource-card.featured h3 { font-size: 27px; }
  .guide-layout { gap: 65px; }
}
@media (max-width: 820px) {
  .desktop-nav,.header-contact { display: none; }
  .header-actions { margin-left: auto; }
  .menu-toggle { display: block; }
  .hero { min-height: auto; padding-top: 118px; }
  .hero-layout { grid-template-columns: 1fr; }
  .hero-copy { max-width: 700px; }
  .hero-visual { max-width: 680px; margin-inline: auto; }
  .section-heading { grid-template-columns: 1fr; gap: 28px; }
  .library-toolbar { align-items: flex-start; padding: 17px 0; }
  .filter-group { flex-wrap: wrap; }
  .resource-grid { grid-template-columns: 1fr 1fr; }
  .resource-card.featured { grid-column: 1 / -1; }
  .guide-layout,.final-layout { grid-template-columns: 1fr; }
  .guide-layout { gap: 58px; }
}
@media (max-width: 560px) {
  body { padding-bottom: 62px; }
  [id] { scroll-margin-top: 70px; }
  .shell { width: min(calc(100% - 28px),var(--shell)); }
  .header-inner { height: 68px; }
  .brand { width: 93px; }
  .section { padding: 80px 0; }
  .hero { padding-top: 96px; }
  .breadcrumb { display: none; }
  .hero h1 { font-size: clamp(39px,11.5vw,48px); line-height: 1.16; }
  .hero-slogan { margin-top: 20px; font-size: 18px; line-height: 1.55; }
  .hero-lead { font-size: 14px; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 16px; }
  .hero-actions .button { width: 100%; }
  .text-link { align-self: flex-start; }
  .hero-meta { display: grid; grid-template-columns: repeat(3,1fr); }
  .hero-meta div { min-width: 0; padding-left: 10px; }
  .hero-meta dd { font-size: 9px; line-height: 1.5; }
  .hero-visual { margin-top: 8px; box-shadow: 10px 10px 0 rgba(103,84,247,.14); }
  .hero-visual figcaption { min-height: auto; display: grid; gap: 7px; }
  .hero-topics { grid-template-columns: 1fr; margin-top: 28px; }
  .hero-topics > span { min-height: 66px; border-right: 1px solid rgba(255,255,255,.12); border-bottom: 1px solid rgba(255,255,255,.12); }
  .section-heading { margin-bottom: 45px; }
  .section-heading h2,.guide-heading h2 { font-size: 33px; line-height: 1.4; }
  .library-toolbar { display: block; }
  .filter-group { display: grid; grid-template-columns: 1fr 1fr; }
  .filter-button { width: 100%; padding: 0 10px; border-color: var(--line); }
  .result-count { margin-top: 17px; text-align: right; }
  .resource-grid { grid-template-columns: 1fr; gap: 14px; }
  .resource-card.featured { grid-column: auto; }
  .resource-card.featured > a { display: flex; }
  .resource-card.featured .resource-cover { min-height: auto; aspect-ratio: 1.2 / 1; border-right: 0; border-bottom: 1px solid var(--line); }
  .resource-card.featured .resource-copy { padding: 25px 24px 22px; }
  .resource-card.featured h3,.resource-card h3 { margin-top: 42px; font-size: 23px; }
  .resource-card.featured p { font-size: 12px; }
  .guide-steps li { grid-template-columns: 44px 1fr; min-height: 170px; }
  .final-cta { padding: 76px 0; }
  .final-layout { gap: 42px; }
  .final-layout h2 { font-size: 35px; }
  .footer-main { grid-template-columns: 1fr; gap: 38px; padding-bottom: 42px; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-nav div:first-child { display: none; }
  .footer-bottom { min-height: 90px; flex-direction: column; align-items: flex-start; justify-content: center; gap: 10px; }
  .footer-bottom span:last-child { gap: 13px; }
  .mobile-contact { position: fixed; z-index: 100; inset: auto 0 0; height: 62px; display: grid; grid-template-columns: .78fr 1.22fr; gap: 7px; padding: 7px; border-top: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
  .mobile-contact a { display: grid; place-items: center; border: 1px solid var(--line); background: #fff; font-size: 12px; font-weight: 700; }
  .mobile-contact a:last-child { color: #fff; border-color: var(--purple); background: var(--purple); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}
@media print {
  .site-header,.reading-progress,.mobile-contact,.hero-actions,.filter-group,.final-cta,.site-footer,.skip-link { display: none !important; }
  .hero { min-height: auto; padding: 22mm 0; }
  .hero-layout { grid-template-columns: 1fr 1fr; gap: 12mm; }
  .section { padding: 12mm 0; }
  .resource-grid { grid-template-columns: 1fr 1fr; }
  .resource-card.featured { grid-column: 1 / -1; }
  .resource-card[hidden] { display: block; }
  .reveal { opacity: 1 !important; transform: none !important; }
}