:root{--color-paper:#f4f1ec;--color-cream:#fbfaf7;--color-ink:#141416;--color-ink-soft:#3f3f46;--color-muted:#6b6b73;--color-line:#e4e0d8;--color-brand:#e50914;--color-brand-dark:#b20710;--color-brand-soft:#fde8e9;--color-night:#0c0c0e;--color-fog:#a1a1aa;--color-good:#0f7a43;--color-good-soft:#e6f6ec;--color-warn:#9a5b12;--color-warn-soft:#f8edd9;--font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",ui-sans-serif,system-ui,sans-serif;--shadow-card:0 0 0 1px rgba(20, 20, 22, 0.06),0 1px 2px rgba(20, 20, 22, 0.04),0 8px 24px rgba(20, 20, 22, 0.04)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:5.5rem;-webkit-font-smoothing:antialiased}
body{background:var(--color-paper);color:var(--color-ink);font-family:var(--font-sans);line-height:1.6}
[role=button]:not(:disabled),button:not(:disabled){cursor:pointer}
h1,h2,h3,h4{line-height:1.3}
::selection{background:var(--color-brand);color:#fff}
.container{max-width:1152px;margin:0 auto;padding:0 .5rem}
@media (min-width:640px){.container{padding:0 1.5rem}
}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.25rem;font-size:15px;font-weight:600;border-radius:8px;text-decoration:none;transition:all .15s;border:none;cursor:pointer}
.btn-primary{background:var(--color-brand);color:#fff;box-shadow:0 8px 20px rgba(229,9,20,.22)}
.btn-primary:hover{background:var(--color-brand-dark)}
.btn-outline{background:var(--color-cream);color:var(--color-ink);box-shadow:0 0 0 1px rgba(20,20,22,.12)}
.btn-outline:hover{background:#fff}
.card{background:var(--color-cream);border-radius:16px;box-shadow:var(--shadow-card);padding:1.5rem}
@media (min-width:640px){.card{padding:2rem}
}
.tag{display:inline-flex;padding:.25rem .625rem;border-radius:9999px;font-size:12px;font-weight:600}
.tag-good{background:var(--color-good-soft);color:var(--color-good)}
.tag-warn{background:var(--color-warn-soft);color:var(--color-warn)}
header{position:sticky;top:0;z-index:50;background:var(--color-night);border-bottom:1px solid rgba(255,255,255,.1);backdrop-filter:blur(12px)}
header .inner{display:flex;align-items:center;justify-content:space-between;height:56px}
@media (min-width:640px){header .inner{height:64px}
}
header .logo{display:flex;align-items:center;gap:.5rem;color:var(--color-cream);text-decoration:none;font-weight:600;font-size:15px}
header .logo-icon{display:grid;place-items:center;width:28px;height:28px;background:var(--color-brand);color:#fff;border-radius:6px;font-size:13px;font-weight:800}
header nav{display:none;gap:1.5rem}
@media (min-width:1024px){header nav{display:flex}
}
header nav a{color:var(--color-fog);text-decoration:none;font-size:13px;font-weight:500;transition:color .15s}
header nav a:hover{color:var(--color-cream)}
.menu-toggle{display:grid;place-items:center;width:40px;height:40px;background:0 0;border:none;color:var(--color-cream);border-radius:6px;cursor:pointer}
@media (min-width:1024px){.menu-toggle{display:none}
}
.mobile-menu{display:none;border-top:1px solid rgba(255,255,255,.1);background:var(--color-night);padding:1rem}
.mobile-menu.open{display:block}
@media (min-width:1024px){.mobile-menu{display:none!important}
}
.mobile-menu a{display:block;padding:.75rem;color:var(--color-cream);text-decoration:none;font-size:15px;border-radius:6px}
.mobile-menu .btn{margin-top:.5rem;width:100%}
.hero{padding-bottom:2rem;position:relative;overflow:hidden;background:linear-gradient(135deg, rgba(10, 10, 12, 0.65) 0%, rgba(15, 15, 18, 0.75) 100%), url('images/hero.jpg') center/cover no-repeat;color:var(--color-cream);background-attachment:fixed;background-size:cover;background-position:center 20%}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,rgba(10,10,12,.6) 0,rgba(20,20,25,.7) 50%,rgba(10,10,12,.65) 100%);pointer-events:none}
.hero-content{position:relative;z-index:1}
.hero-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.25rem .75rem;background:rgba(255,255,255,.08);border-radius:9999px;font-size:12px;font-weight:500;color:var(--color-fog);box-shadow:0 0 0 1px rgba(255,255,255,.08);margin-bottom:1.25rem}
.hero-badge-dot{width:6px;height:6px;background:var(--color-brand);border-radius:50%}
.hero h1{font-size:2.05rem;line-height:1.18;font-weight:600;max-width:48rem}
@media (min-width:640px){.hero h1{font-size:3rem;line-height:1.12}
}
.hero h1 .brand{color:var(--color-brand)}
.hero h1 .sub{display:block;margin-top:.5rem;font-weight:500;color:rgba(251,250,247,.9)}
.hero-desc{margin-top:1.25rem;font-size:16px;line-height:1.6;color:var(--color-fog)}
@media (min-width:640px){.hero-desc{font-size:18px}
}
.hero-desc strong{font-weight:600;color:var(--color-cream)}
.hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:2rem}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;margin-top:3.5rem;max-width:48rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.1);position:relative;z-index:1}
.hero-stats dt{font-size:18px;font-weight:600}
@media (min-width:640px){.hero-stats dt{font-size:24px}
}
.hero-stats dd{margin-top:.25rem;font-size:12px;color:var(--color-fog)}
@media (min-width:640px){.hero-stats dd{font-size:14px}
}
section{padding:3rem 0}
@media (min-width:640px){section{padding:4rem 0 0}
}
.section-head{margin-bottom:2rem;max-width:42rem}
.section-tag{font-size:12px;font-weight:600;color:var(--color-brand);text-transform:uppercase;letter-spacing:.05em}
.section-title{margin-top:.5rem;font-size:24px;font-weight:600}
@media (min-width:640px){.section-title{font-size:30px}
}
.section-desc{margin-top:.75rem;font-size:15px;line-height:1.6;color:var(--color-ink-soft)}
.prose p{margin-bottom:1rem;color:var(--color-ink-soft);line-height:1.85;font-size:17px}
.prose strong{color:var(--color-ink);font-weight:650}
.prose ul{margin:0 0 1.1rem;padding-left:1.2rem;list-style:disc}
.prose li{margin-bottom:.45rem;color:var(--color-ink-soft);line-height:1.75}
.grid{display:grid;gap:1rem}
.grid-2{grid-template-columns:repeat(1,1fr)}
@media (min-width:640px){.grid-2{grid-template-columns:repeat(2,1fr)}
}
.table-wrap{overflow-x:auto;border-radius:16px;box-shadow:var(--shadow-card);background:var(--color-cream)}
.table-wrap table{width:100%;border-collapse:collapse;min-width:640px}
.table-wrap td,.table-wrap th{padding:.85rem 1.1rem;text-align:left;border-bottom:1px solid var(--color-line);font-size:14px}
.table-wrap th{background:#efece6;font-weight:650;color:var(--color-ink);white-space:nowrap}
.table-wrap td{color:var(--color-ink-soft)}
.table-wrap tr:last-child td{border-bottom:none}
.table-wrap tbody tr:hover td{background:#f3efe8}
.table-wrap .hl td{background:#fff5f5}
footer{border-top:1px solid var(--color-line);background:var(--color-cream);padding:3.5rem 0 1.25rem}
footer .grid{gap:2.5rem}
@media (min-width:768px){footer .grid{grid-template-columns:repeat(4,1fr)}
footer .col-span-2{grid-column:span 2}
}
footer .footer-logo{display:flex;align-items:center;gap:.5rem;margin-bottom:.75rem;font-weight:600}
footer .footer-logo-icon{display:grid;place-items:center;width:28px;height:28px;background:var(--color-brand);color:#fff;border-radius:6px;font-size:13px;font-weight:800}
footer .footer-desc{font-size:12px;line-height:1.6;color:var(--color-muted)}
footer .footer-title{margin-bottom:.75rem;font-size:12px;font-weight:600;color:var(--color-muted);text-transform:uppercase;letter-spacing:.05em}
footer ul{list-style:none}
footer li{margin-bottom:.5rem}
footer a{color:var(--color-ink-soft);text-decoration:none;font-size:14px;transition:color .15s}
footer a:hover{color:var(--color-brand)}
footer .footer-bottom{display:flex;flex-direction:column;gap:.5rem;padding:1.25rem 0;margin-top:2rem;border-top:1px solid var(--color-line);font-size:12px;color:var(--color-muted)}
@media (min-width:640px){footer .footer-bottom{flex-direction:row;justify-content:space-between}
}
details{background:var(--color-cream);border-radius:12px;box-shadow:var(--shadow-card);margin-bottom:.5rem}
details summary{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;font-size:15px;font-weight:600;cursor:pointer;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::after{content:'▼';font-size:12px;color:var(--color-brand);transition:transform .2s}
details[open] summary::after{transform:rotate(180deg)}
details p{padding:0 1.25rem 1.25rem;font-size:14px;line-height:1.6;color:var(--color-ink-soft)}
.alert{padding:1rem 1.25rem;border-radius:12px;border-left:4px solid;margin:1.5rem 0}
.alert-warn{background:var(--color-warn-soft);border-color:var(--color-warn)}
.alert-title{font-weight:600;margin-bottom:.25rem}
.alert p{margin:.25rem 0 0;font-size:14px;color:var(--color-ink-soft)}
.bottom-bar{position:fixed;bottom:0;left:0;right:0;z-index:40;background:rgba(251,250,247,.95);backdrop-filter:blur(12px);border-top:1px solid var(--color-line);padding:.75rem;display:flex;gap:.5rem}
@media (min-width:768px){.bottom-bar{display:none}
}
.bottom-bar .btn{flex:1;height:44px;padding:0;font-size:13px}
.pb-mobile{padding-bottom:5rem}
@media (min-width:768px){.pb-mobile{padding-bottom:0}
}
.mt-3{margin-top:.75rem}
.mt-4{margin-top:1rem}
/* Shared article + homepage components */
.grid-3{grid-template-columns:repeat(1,1fr)}
@media (min-width:768px){.grid-3{grid-template-columns:repeat(3,1fr)}}
.article-link{color:var(--color-brand);text-decoration:none;font-weight:600}
.article-link:hover{text-decoration:underline}
.badge{display:inline-flex;align-items:center;padding:.25rem .625rem;border-radius:9999px;background:var(--color-brand-soft);color:var(--color-brand-dark);font-size:12px;font-weight:700}
.card-highlight{box-shadow:var(--shadow-card),0 0 0 1px rgba(229,9,20,.28)}
.article-main{padding-top:2.5rem;padding-bottom:4rem}
.article-card h1{font-size:clamp(1.75rem,4vw,2.5rem);margin-bottom:.75rem}
.article-card h2{font-size:1.35rem;margin:2rem 0 .9rem}
.article-card h3{font-size:1.05rem;margin:1.4rem 0 .45rem}
.article-meta{font-size:13px!important;color:var(--color-muted)!important;margin-bottom:0!important}
.article-divider{border:0;border-top:1px solid var(--color-line);margin:1.5rem 0}
.article-cta{margin-top:2rem;padding:1.5rem;border-radius:12px;background:#efece6;text-align:center}
.article-cta p{margin-bottom:.75rem;color:var(--color-ink)}
.article-card details{box-shadow:none;border:1px solid var(--color-line)}
.article-card details p{margin:0}
.home-hero{padding:3.5rem 0 2.5rem}
.hero-intro{max-width:48rem;margin:0 auto;text-align:center;position:relative;z-index:1}
.hero-update{display:flex;justify-content:center;align-items:center;gap:.75rem;flex-wrap:wrap;margin-bottom:1rem;font-size:12px;color:var(--color-fog)}
.hero-intro h1{margin:0 auto}
.hero-intro .hero-desc{max-width:46rem;margin-left:auto;margin-right:auto}
.hero-intro .hero-actions{justify-content:center}
.hero-stats-home{margin-top:3rem;text-align:center;position:relative;z-index:1}
.stat-card{padding:1.25rem}
.stat-value{font-size:1.55rem;font-weight:700;color:var(--color-brand)}
.stat-label{margin-top:.25rem;font-size:13px;color:var(--color-muted)}
.editor-strip{padding:1.5rem 0;background:var(--color-cream);border-bottom:1px solid var(--color-line)}
.editor-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:13px;color:var(--color-muted)}
.editor-profile{display:flex;align-items:center;gap:.75rem}
.editor-avatar{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--color-night);color:#fff;font-weight:700}
.editor-name{color:var(--color-ink);font-weight:600}
.verify-tag{padding:.3rem .75rem;border-radius:6px;background:var(--color-good-soft);color:var(--color-good);font-size:12px;font-weight:600}
.quick-answer h2{margin-bottom:1rem}
.quick-answer p{margin-bottom:.75rem;color:var(--color-ink-soft);line-height:1.8}
.quick-answer p:last-child{margin-bottom:0}
.plan-card{display:flex;flex-direction:column;justify-content:space-between}
.plan-head{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem}
.plan-price{text-align:right;white-space:nowrap}
.plan-price strong{font-size:1.5rem}
.plan-card>div>p{margin:1rem 0;color:var(--color-ink-soft);font-size:14px}
.plan-card ul{padding-left:1.2rem;margin-bottom:1.5rem;color:var(--color-ink-soft);font-size:14px;line-height:1.8}
.plan-card .btn{width:100%}
.steps{display:flex;flex-direction:column;gap:1rem}
.step-card{display:flex;gap:1.25rem;align-items:flex-start}
.step-number{display:grid;place-items:center;width:36px;height:36px;flex:0 0 36px;border-radius:50%;background:var(--color-brand);color:#fff;font-weight:800}
.step-card h3{font-size:1.05rem;margin-bottom:.25rem}
.step-card p{font-size:14px;color:var(--color-ink-soft);line-height:1.7}
.troubleshoot-list{display:flex;flex-direction:column;gap:1rem}
.troubleshoot-list>div+div{border-top:1px solid var(--color-line);padding-top:1rem}
.troubleshoot-list strong{color:var(--color-ink)}
.troubleshoot-list p{margin-top:.3rem;color:var(--color-ink-soft);font-size:14px}
.guide-card h3{font-size:1rem;margin-bottom:.5rem}
.guide-card h3 a{color:var(--color-ink);text-decoration:none}
.guide-card h3 a:hover{color:var(--color-brand)}
.guide-card p{margin-bottom:.8rem;color:var(--color-ink-soft);font-size:13px;line-height:1.65}
.faq-wrap{max-width:900px}
.faq-head{text-align:center;margin-bottom:2rem}
.faq-head p{margin-top:.5rem;color:var(--color-muted);font-size:14px}
.footer-centered{text-align:center}
.footer-centered .footer-desc{margin:0 auto .75rem}
@media (max-width:639px){.home-hero{padding:2.5rem 0 2rem}.plan-head{flex-direction:column}.plan-price{text-align:left}.step-card{padding:1.25rem}.editor-row{align-items:flex-start}}

/* Expanded long-form article components */
.answer-box,.cost-formula{margin:1.35rem 0;padding:1.15rem 1.25rem;border-radius:12px;background:var(--color-brand-soft);color:var(--color-ink-soft);border:1px solid rgba(229,9,20,.16);line-height:1.75}
.compare-grid,.scenario-grid,.requirement-grid,.change-grid{display:grid;grid-template-columns:1fr;gap:.85rem;margin:1.25rem 0}
@media (min-width:720px){.compare-grid,.scenario-grid{grid-template-columns:repeat(3,1fr)}.requirement-grid{grid-template-columns:repeat(3,1fr)}.change-grid{grid-template-columns:repeat(3,1fr)}}
.mini-card,.scenario,.requirement-grid>div,.change-grid>div,.home-check>div,.key-points>div,.risk-meter>div{padding:1rem 1.05rem;border:1px solid var(--color-line);border-radius:12px;background:#fff}
.mini-card h3,.scenario h3{margin:0 0 .4rem;font-size:1rem}.mini-card p,.scenario p,.requirement-grid span,.change-grid p,.home-check p,.key-points p,.risk-meter p{margin:0!important;font-size:14px!important;line-height:1.65!important}
.check-list{list-style:none!important;padding-left:0!important}.check-list li{position:relative;padding-left:1.65rem}.check-list li:before{content:'✓';position:absolute;left:0;top:0;color:var(--color-good);font-weight:800}
.numbered-list{counter-reset:item;list-style:none!important;padding-left:0!important}.numbered-list li{counter-increment:item;position:relative;padding-left:2.2rem;margin-bottom:.8rem!important}.numbered-list li:before{content:counter(item);position:absolute;left:0;top:.1rem;display:grid;place-items:center;width:1.5rem;height:1.5rem;border-radius:50%;background:var(--color-ink);color:#fff;font-size:12px;font-weight:700}
.content-table{width:100%;border-collapse:collapse;margin:1.25rem 0;font-size:14px;display:block;overflow-x:auto}.content-table thead,.content-table tbody{display:table;width:100%;min-width:620px;table-layout:fixed}.content-table th,.content-table td{padding:.8rem .85rem;border:1px solid var(--color-line);text-align:left;vertical-align:top}.content-table th{background:#efece6}.content-table td{background:#fff;color:var(--color-ink-soft)}
.step-stack{display:grid;gap:.7rem;margin:1.2rem 0}.step-row{display:grid;grid-template-columns:34px 1fr;gap:.8rem;align-items:start;padding:.85rem 1rem;border:1px solid var(--color-line);border-radius:12px;background:#fff}.step-row>b{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--color-brand);color:#fff}.step-row p{margin:0!important;font-size:15px!important}
.diagnosis-strip,.test-flow,.path-diagram,.subtitle-flow{display:flex;gap:.55rem;align-items:center;flex-wrap:wrap;margin:1.2rem 0;padding:.9rem 1rem;border-radius:12px;background:#111;color:#fff;font-size:13px}.diagnosis-strip span,.test-flow span,.path-diagram span,.subtitle-flow span{color:#fff}.diagnosis-strip b{color:#fff}.test-flow i,.path-diagram i,.subtitle-flow i{font-style:normal;color:var(--color-brand)}
.key-points,.risk-meter,.home-check{display:grid;grid-template-columns:1fr;gap:.85rem;margin:1.2rem 0}@media (min-width:700px){.key-points{grid-template-columns:repeat(2,1fr)}.risk-meter,.home-check{grid-template-columns:repeat(3,1fr)}}
.metric-list{list-style:none!important;padding:0!important;display:grid;gap:.7rem;margin:1.2rem 0}.metric-list li{display:grid;grid-template-columns:9rem 1fr;gap:.8rem;padding:.9rem 1rem;border-bottom:1px solid var(--color-line);margin:0!important}.metric-list span{color:var(--color-ink-soft)}
.faq-list{display:grid;gap:.8rem;margin-top:1rem}.faq-item{padding:1rem 1.1rem;border-radius:12px;background:#fff;border:1px solid var(--color-line)}.faq-item h3{margin:0 0 .4rem!important;font-size:1rem!important}.faq-item p{margin:0!important;font-size:14px!important;line-height:1.7!important}
.article-card .faq-item p{color:var(--color-ink-soft)}
.article-card a{overflow-wrap:anywhere}.article-card>p:first-of-type{font-size:17px}
.article-card{overflow:hidden}
.article-card .article-pagination{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:2.5rem;row-gap:1.25rem;margin:3rem 0 .25rem;padding-top:2rem;border-top:1px solid var(--color-line)}
.article-card .article-page-link{display:flex;flex-direction:column;justify-content:center;gap:.75rem;min-height:120px;padding:1.25rem 1.4rem;border:1px solid var(--color-line);border-radius:14px;background:linear-gradient(135deg,#fff 0%,#fbfaf7 100%);color:var(--color-ink);text-decoration:none;box-shadow:0 5px 18px rgba(28,25,23,.06);transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}
.article-card .article-page-prev{border-left:4px solid var(--color-brand)}
.article-card .article-page-next{align-items:flex-end;border-right:4px solid var(--color-brand);text-align:right}
.article-card .article-page-link:hover{border-color:rgba(229,9,20,.48);box-shadow:0 10px 28px rgba(28,25,23,.12);transform:translateY(-3px)}
.article-card .article-page-link:focus-visible{outline:3px solid rgba(229,9,20,.24);outline-offset:3px}
.article-card .article-page-link span{display:inline-flex;width:fit-content;padding:.3rem .65rem;border-radius:999px;background:var(--color-brand-soft);color:var(--color-brand);font-size:13px;font-weight:700;line-height:1.4}
.article-card .article-page-link strong{display:block;font-size:15px;line-height:1.65}
@media (max-width:639px){.article-card .article-pagination{grid-template-columns:1fr;gap:1rem;margin-top:2.25rem;padding-top:1.5rem}.article-card .article-page-link{min-height:104px}.article-card .article-page-next{align-items:flex-start;border-right:1px solid var(--color-line);border-left:4px solid var(--color-brand);text-align:left}}

/* Source-informed article modules */
.requirement-grid>div strong{display:block;margin-bottom:.35rem;color:var(--color-ink)}
.content-table td:first-child{font-weight:600;color:var(--color-ink)}
.article-card .path-diagram,.article-card .test-flow,.article-card .subtitle-flow{margin:1.4rem 0}
.article-card .cost-formula strong{color:var(--color-ink)}