*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#0f172a;line-height:1.82;font-size:16px}
a{color:#1d4ed8;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.site-header{background:#fff;border-bottom:2px solid #e2e8f0;position:sticky;top:0;z-index:300;box-shadow:0 1px 0 rgba(15,23,42,.04)}
.header-inner{max-width:1120px;margin:0 auto;padding:14px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:11px;color:#0f172a;font-weight:600;font-size:.96rem}
.brand em{font-style:normal;color:#1d4ed8;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 20px;list-style:none}
.site-nav a{color:#334155;font-size:.91rem}
.site-nav a.active{color:#1d4ed8;font-weight:600}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:#334155;margin:5px 0;border-radius:1px}

.ads-top-bar{background:#f8fafc;border-bottom:1px solid #e2e8f0;padding:10px 0}
#applist .applist-title{font-size:.84rem;color:#64748b;margin-bottom:8px}
#ads{display:flex;flex-wrap:wrap;gap:12px}

.zig-shell{max-width:1120px;margin:0 auto;padding:0 22px 56px}
.hero-slab{background:linear-gradient(135deg,#eff6ff 0%,#fff 55%,#f0fdf4 100%);padding:40px 22px 32px;margin-bottom:4px;border-bottom:1px solid #dbeafe;position:relative;overflow:hidden}
.hero-slab::after{content:"";position:absolute;right:-40px;top:-60px;width:220px;height:220px;background:radial-gradient(circle,#bfdbfe 0%,transparent 70%);opacity:.45;pointer-events:none}
.hero-slab h1{font-size:clamp(1.38rem,3.6vw,1.92rem);line-height:1.34;margin-bottom:16px;color:#0f172a;max-width:780px;position:relative;z-index:1}
.hero-chip{display:inline-block;font-size:.8rem;color:#1e3a8a;background:#dbeafe;padding:5px 14px;border-radius:999px;margin-bottom:14px;border:1px solid #93c5fd;position:relative;z-index:1}
.hero-lead{font-size:1.03rem;color:#475569;max-width:760px;position:relative;z-index:1}

.chapter-strip{display:flex;flex-wrap:wrap;gap:8px 10px;padding:22px 0 8px;border-bottom:1px dashed #cbd5e1;margin-bottom:8px}
.chapter-strip a{font-size:.82rem;color:#1e40af;background:#f1f5f9;padding:6px 12px;border-radius:6px;border:1px solid #e2e8f0}
.chapter-strip a:hover{background:#dbeafe;text-decoration:none}

.zig-block{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;align-items:center;padding:38px 0;border-bottom:1px solid #f1f5f9}
.zig-block.flip .zig-copy{order:2}
.zig-block.flip .zig-visual{order:1}
.zig-copy h2{font-size:1.22rem;margin-bottom:14px;color:#0f172a;letter-spacing:.01em}
.zig-copy p{margin-bottom:13px;color:#334155}
.zig-visual figure{margin:0;border-radius:14px;overflow:hidden;border:1px solid #e2e8f0;box-shadow:0 8px 24px rgba(15,23,42,.06);transform:rotate(-.6deg)}
.zig-block.flip .zig-visual figure{transform:rotate(.6deg)}
.zig-visual figcaption{font-size:.81rem;color:#64748b;margin-top:10px;text-align:center;transform:none}

.tip-box{background:#f0fdf4;border:1px solid #bbf7d0;border-left:4px solid #22c55e;padding:14px 18px;margin:18px 0;border-radius:0 10px 10px 0;font-size:.94rem;color:#166534}
.warn-box{background:#fff7ed;border:1px solid #fed7aa;border-left:4px solid #f97316;padding:14px 18px;margin:18px 0;border-radius:0 10px 10px 0;font-size:.94rem;color:#9a3412}

.plain-section{padding:34px 0;border-bottom:1px solid #f1f5f9}
.plain-section h2{font-size:1.18rem;margin-bottom:12px;color:#0f172a}

.faq-zone{padding:40px 0 24px}
.faq-zone h2{font-size:1.2rem;margin-bottom:18px;color:#0f172a}
.faq-card{border:1px solid #e2e8f0;border-radius:12px;padding:18px 20px;margin-bottom:14px;background:#fafafa}
.faq-card h3{font-size:1rem;margin-bottom:8px;color:#0f172a}
.faq-card p{color:#475569;font-size:.95rem}

.read-links{padding:28px 0;border-top:1px solid #e2e8f0}
.read-links h2{font-size:1.05rem;margin-bottom:10px}
.read-links ul{padding-left:1.25rem;line-height:1.95;color:#334155}

.closing-band{background:#f8fafc;border-top:1px solid #e2e8f0;padding:32px 22px;margin-top:12px}
.closing-band .zig-shell{padding-bottom:0}
.closing-band h2{font-size:1.05rem;margin-bottom:10px;color:#0f172a}
.closing-band p{color:#475569;margin-bottom:10px}

.site-footer{background:#0f172a;color:#94a3b8;padding:30px 22px;text-align:center;font-size:.87rem}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 22px;margin-bottom:12px}
.site-footer a{color:#cbd5e1}
.prose-page{max-width:720px;margin:40px auto;padding:0 22px}
.prose-page h1{font-size:1.42rem;margin-bottom:16px;color:#0f172a}
.error-page{max-width:480px;margin:80px auto;padding:0 22px;text-align:center}
.error-page h1{font-size:3rem;color:#1d4ed8;margin-bottom:12px}

@media(max-width:768px){
  .nav-toggle{display:block}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #e2e8f0;display:none;padding:14px 22px}
  .site-nav.is-open{display:block}
  .site-header{position:relative}
  .zig-block{grid-template-columns:1fr;gap:18px}
  .zig-block.flip .zig-copy,.zig-block.flip .zig-visual{order:unset}
  .zig-visual figure{transform:none}
}