/* site styles */
:root{--primary:#6C4FF8;--primary-soft:#9B8AFB;--ink:#252331;--deep:#1E1B2E;--muted:#716E7E;--bg:#F7F6FB;--bg2:#EEEAF8;--accent:#F06A8A;--white:#fff;--border:rgba(37,35,49,.12);--shadow:0 18px 55px rgba(30,27,46,.10);--radius:24px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button{font:inherit}.shell{width:min(1160px,calc(100% - 40px));margin-inline:auto}.narrow{width:min(760px,calc(100% - 40px))}.skip-link{position:fixed;left:16px;top:-80px;z-index:99;background:var(--deep);color:white;padding:10px 16px;border-radius:10px}.skip-link:focus{top:16px}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,246,251,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}.header-inner{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--deep)}.brand img{width:38px;height:38px;object-fit:contain;border-radius:12px}.primary-nav{display:flex;gap:8px;align-items:center}.nav-link{padding:9px 12px;border-radius:12px;color:var(--muted)}.nav-link:hover,.nav-link:focus-visible,.nav-link.is-active{background:var(--bg2);color:var(--deep)}.menu-toggle{display:none;border:1px solid var(--border);background:white;border-radius:12px;padding:8px 12px}.hero{padding:72px 0 56px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}.hero-copy h1,.page-intro h1{font-size:clamp(2.4rem,5vw,5rem);line-height:1.05;letter-spacing:-.04em;margin:.2em 0 .28em;color:var(--deep)}.lead{font-size:1.15rem;color:var(--muted);max-width:760px}.eyebrow{display:inline-block;margin:0 0 10px;font-weight:800;font-size:.78rem;letter-spacing:.15em;text-transform:uppercase;color:var(--primary)}.hero-media img,.portrait-media img,.feature-panel img{border-radius:32px;box-shadow:var(--shadow);aspect-ratio:4/3;object-fit:cover}.action-row{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin-top:28px}.button{background:var(--primary);color:#fff;border-radius:14px;padding:12px 18px;font-weight:700;box-shadow:0 10px 24px rgba(108,79,248,.22)}.button:hover,.button:focus-visible{transform:translateY(-1px)}.text-link{font-weight:800;color:var(--primary)}.section{padding:72px 0}.tone{background:var(--bg2)}.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.split h2,.section-head h2,.prose h2,.device-card h2,.topic-row h2,.side-note h2{color:var(--deep);line-height:1.25}.split h2,.section-head h2{font-size:clamp(1.8rem,3vw,3rem);margin:.15em 0 .45em}.feature-panel{background:white;border:1px solid var(--border);border-radius:30px;padding:18px}.panel-link{display:block;padding:18px 8px 6px;font-weight:800;color:var(--primary)}.link-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:28px}.link-card{background:white;border:1px solid var(--border);border-radius:20px;padding:22px;min-height:160px;display:flex;flex-direction:column;gap:12px;color:var(--muted);transition:.2s}.link-card:hover,.link-card:focus-visible{transform:translateY(-3px);box-shadow:var(--shadow)}.link-card__title{font-weight:800;color:var(--deep);font-size:1.1rem}.reading-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:60px}.note-list{list-style:none;padding:0;margin:0;display:grid;gap:12px}.note-list li{background:white;border:1px solid var(--border);border-radius:16px;padding:16px 18px}.faq-list{display:grid;gap:12px;max-width:880px}.faq-list details{background:white;border:1px solid var(--border);border-radius:16px;padding:6px 18px}.faq-list summary{cursor:pointer;font-weight:800;padding:14px 0}.faq-list p{color:var(--muted);margin:0 0 16px}.page-intro{padding:68px 0 30px}.page-intro h1{font-size:clamp(2.2rem,4.8vw,4.5rem);max-width:930px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:54px;align-items:start}.prose{font-size:1.04rem}.prose section+section{margin-top:52px}.prose h2{font-size:1.65rem;margin-bottom:12px}.prose p{color:#454250}.prose img{border-radius:24px;margin:28px 0;max-height:440px;width:100%;object-fit:cover}.side-note{position:sticky;top:108px;background:white;border:1px solid var(--border);border-radius:22px;padding:22px;display:grid;gap:10px}.side-note h2{margin:0 0 8px;font-size:1.1rem}.side-note a{padding:10px 12px;border-radius:12px;background:var(--bg);color:var(--primary);font-weight:700}.clean-list{padding-left:1.2em}.clean-list li+li{margin-top:8px}.editorial-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}.portrait-media{position:sticky;top:108px}.device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.device-card{background:white;border:1px solid var(--border);border-radius:24px;padding:22px}.device-card img{border-radius:18px;aspect-ratio:16/10;object-fit:cover;margin-bottom:18px}.wide{max-width:920px}.topic-stack{display:grid;gap:24px}.topic-row{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:36px;align-items:center;background:white;border:1px solid var(--border);border-radius:28px;padding:30px}.topic-row:nth-child(even){grid-template-columns:340px minmax(0,1fr)}.topic-row:nth-child(even) img{order:-1}.topic-row img{border-radius:20px;aspect-ratio:4/3;object-fit:cover}.summary{font-weight:700;color:var(--deep)}.site-footer{background:var(--deep);color:#ddd9ec;padding:48px 0 24px;margin-top:70px}.footer-grid{display:grid;grid-template-columns:1fr auto;gap:30px}.footer-grid p{color:#aaa6bb}.footer-grid nav{display:grid;grid-template-columns:repeat(2,auto);gap:10px 22px}.footer-grid a:hover,.footer-grid a:focus-visible{color:white}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;margin-top:30px;color:#918ca2;font-size:.9rem}.error-panel{padding:110px 0}.error-panel h1{font-size:clamp(2rem,6vw,4rem);margin:.2em 0}.error-panel p{color:var(--muted)}
@media (max-width:900px){.hero-grid,.split,.reading-grid,.editorial-grid,.article-layout{grid-template-columns:1fr}.link-grid{grid-template-columns:repeat(2,1fr)}.device-grid{grid-template-columns:1fr}.topic-row,.topic-row:nth-child(even){grid-template-columns:1fr}.topic-row:nth-child(even) img{order:0}.side-note,.portrait-media{position:static}.hero{padding-top:44px}.hero-grid{gap:30px}}
@media (max-width:700px){.shell,.narrow{width:min(100% - 28px,1160px)}.menu-toggle{display:block}.primary-nav{display:none;position:absolute;left:14px;right:14px;top:68px;background:white;border:1px solid var(--border);border-radius:18px;padding:10px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.primary-nav.is-open{display:flex}.nav-link{padding:12px 14px}.hero-copy h1,.page-intro h1{letter-spacing:-.03em}.section{padding:54px 0}.link-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-grid nav{grid-template-columns:1fr 1fr}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.detail-columns{columns:2 360px;column-gap:28px}.detail-item{break-inside:avoid;background:#fff;border:1px solid var(--border);border-radius:18px;padding:18px 20px;margin:0 0 18px}.detail-item h3,.trouble-item h3{margin:0 0 8px;color:var(--deep);font-size:1.05rem}.detail-item p,.trouble-item p{margin:0;color:var(--muted)}.trouble-item{padding:18px 0;border-bottom:1px solid var(--border)}

@media print{
  .site-header,.site-footer,.menu-toggle,.action-row{display:none!important}
  body{background:#fff;color:#000;font-size:11pt}
  .shell,.narrow{width:100%;max-width:none}
  .section,.page-intro,.hero{padding:18px 0}
  a{text-decoration:underline}
  img{max-height:360px;object-fit:contain}
  .link-card,.device-card,.topic-row,.detail-item{box-shadow:none;border:1px solid #bbb;break-inside:avoid}
}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
::selection{background:rgba(108,79,248,.2)}