*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",sans-serif;background:#fff;color:#1a1a1a;line-height:1.75;font-size:16px}
a{color:#c62828;text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.site-header{background:#fff;border-bottom:2px solid #111;position:sticky;top:0;z-index:300}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0;position:relative}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:600;font-size:.95rem}
.brand:hover{text-decoration:none}.brand img{border-radius:4px}.brand b{color:#c62828;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:#555;font-size:.9rem;padding:4px 0}
.site-nav a.active,.site-nav a:hover{color:#b71c1c;font-weight:600;border-bottom:2px solid #c62828;text-decoration:none}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#333;transition:.2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.ads-top-bar{background:#fafafa;border-bottom:1px solid #ddd;padding:10px 0}
.applist-title{font-size:.78rem;color:#888;text-align:center;margin-bottom:6px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#666;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}
.site-footer{background:#fafafa;border-top:2px solid #111;padding:28px 0;text-align:center;font-size:.88rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:10px}
.footer-links a{color:#555}
.prose-page{max-width:720px;margin:0 auto;padding:32px 20px 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:48px 20px 24px}
.error-page h1{font-size:3rem;color:#c62828}
@media(max-width:640px){
.nav-toggle{display:flex}
.site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #eee;padding:12px 20px;display:none}
.site-nav.is-open{display:block}.site-nav ul{flex-direction:column;gap:10px}
}

.hero-stack{padding:40px 0 28px;text-align:center}
.hero-stack .tag{display:inline-block;font-size:.78rem;color:#c62828;border:1px solid #c62828;padding:4px 14px;border-radius:20px;margin-bottom:14px;letter-spacing:.06em}
.hero-stack h1{font-size:1.85rem;line-height:1.35;margin-bottom:16px;max-width:780px;margin-left:auto;margin-right:auto}
.hero-stack .lead{color:#333;font-size:1.02rem;text-align:justify;max-width:780px;margin-left:auto;margin-right:auto;margin-bottom:10px}
.chip-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;padding:16px 0 24px}
.chip-nav a{font-size:.86rem;padding:6px 14px;background:#ffebee;color:#b71c1c;border-radius:16px;font-weight:500}
.chip-nav a:hover{background:#ffcdd2;text-decoration:none}
.stack-zone{padding:8px 0 36px;position:relative}
.stack-card{background:#fff;border:2px solid #111;padding:24px 22px 20px;margin-bottom:-18px;position:relative;box-shadow:0 6px 0 rgba(198,40,40,.15)}
.stack-card:nth-child(1){z-index:5;margin-left:0;transform:rotate(-.4deg)}
.stack-card:nth-child(2){z-index:4;margin-left:24px;transform:rotate(.3deg)}
.stack-card:nth-child(3){z-index:3;margin-left:12px;transform:rotate(-.2deg)}
.stack-card:nth-child(4){z-index:2;margin-left:32px;transform:rotate(.5deg)}
.stack-card:nth-child(5){z-index:1;margin-left:8px;margin-bottom:0;transform:rotate(-.3deg)}
.stack-num{display:inline-block;background:#c62828;color:#fff;font-size:.72rem;font-weight:700;padding:2px 8px;border-radius:3px;margin-bottom:8px}
.stack-card h2{font-size:1.12rem;margin-bottom:12px;color:#111}
.stack-card p{margin-bottom:10px;color:#333;font-size:.95rem;text-align:justify}
.stack-card figure{margin:14px 0;border:1px solid #ddd}
.stack-card figcaption{font-size:.78rem;color:#666;padding:6px 10px;background:#fafafa}
.stack-tip{margin:12px 0;padding:10px 12px;background:#fff3e0;border-left:3px solid #ff9800;font-size:.9rem;color:#e65100}
.stack-faq{padding:32px 0 40px;border-top:2px solid #111;margin-top:28px}
.stack-faq h2{font-size:1.2rem;text-align:center;margin-bottom:18px}
.stack-faq details{border:2px solid #111;margin-bottom:8px;background:#fff}
.stack-faq summary{padding:12px 16px;cursor:pointer;font-weight:500;list-style:none}
.stack-faq summary::-webkit-details-marker{display:none}
.stack-faq details[open] summary{border-bottom:1px solid #eee;background:#ffebee}
.stack-faq details p{padding:12px 16px;color:#444;font-size:.93rem}
.related-read{padding:16px 0 40px;border-top:1px solid #ddd}
.related-read h2{font-size:1rem;margin-bottom:12px;text-align:center}
.related-links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 16px}
.related-links a{font-size:.9rem;padding:6px 12px;border:1px solid #ddd;color:#333}
.related-links a:hover{background:#ffebee;text-decoration:none}
@media(max-width:768px){.stack-card{margin-left:0!important;transform:none!important;margin-bottom:16px!important}}