/* site.css — radiantbarrierfactory.com
   Tokens: primary #1E3A5F / secondary #3B82A6 / accent #F59E0B /
   ink #1F2937 / muted #6B7280 / bg #F8FAFC / surface #FFFFFF /
   line #E2E8F0 / dark #10283F. Fonts: IBM Plex Sans + Plex Mono (data only). */
:root{
  --primary:#1E3A5F; --secondary:#3B82A6; --accent:#F59E0B;
  --ink:#1F2937; --muted:#6B7280; --bg:#F8FAFC; --surface:#FFFFFF;
  --line:#E2E8F0; --dark:#10283F;
  --font:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,monospace;
  --wrap:1200px; --radius:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);font-size:17px;line-height:1.65;color:var(--ink);background:var(--bg)}
h1,h2,h3,h4{color:var(--primary);line-height:1.25;margin:0 0 .6em}
h1{font-size:clamp(1.9rem,4vw,2.9rem)}
h2{font-size:clamp(1.45rem,3vw,2rem);margin-top:2.2rem}
h3{font-size:1.15rem;margin-top:1.6rem}
p{margin:0 0 1em}
a{color:var(--secondary);text-decoration:none;border-bottom:1px solid transparent}
a:hover{border-bottom-color:var(--secondary)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
section{padding:72px 0}
.kicker{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem}
.mono{font-family:var(--mono)}

/* ---------- header ---------- */
.site-header{background:var(--primary);color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 2px 12px rgba(16,40,63,.25)}
.header-in{display:flex;align-items:center;gap:1.5rem;padding:.85rem 24px}
.brand{color:#fff;font-weight:700;font-size:1.2rem;border:0;white-space:nowrap}
.brand span{color:var(--accent)}
.main-nav{margin-left:auto;display:flex;align-items:center;gap:1.1rem}
.main-nav a{color:#e7eef5;border:0;font-size:.95rem;padding:.4rem .2rem;position:relative}
.main-nav a:hover{color:#fff}
.nav-drop{position:relative}
.nav-drop>button{background:none;border:0;color:#e7eef5;font:inherit;font-size:.95rem;cursor:pointer;padding:.4rem .2rem}
.nav-drop>button:hover{color:#fff}
.drop-menu{display:none;position:absolute;top:100%;left:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 32px rgba(16,40,63,.18);min-width:190px;padding:.5rem;z-index:60}
.drop-menu a{display:block;color:var(--ink);padding:.55rem .8rem;border-radius:6px;border:0}
.drop-menu a:hover{background:var(--bg);color:var(--primary)}
.nav-drop:focus-within .drop-menu,.nav-drop:hover .drop-menu{display:block}
.nav-cta{background:var(--accent);color:#10283f!important;font-weight:700;padding:.55rem 1.1rem!important;border-radius:var(--radius);border:0!important}
.nav-cta:hover{background:#d97706}
.nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,.4);color:#fff;border-radius:8px;font-size:1.3rem;line-height:1;padding:.35rem .6rem;cursor:pointer}

/* ---------- hero ---------- */
.hero-dark{background:var(--dark);color:#eef3f8;padding:84px 0}
.hero-dark h1{color:#fff;max-width:16em}
.hero-dark .lede{color:#c6d4e2;font-size:1.12rem;max-width:44em}
.hero-cta{display:flex;gap:.9rem;margin-top:1.6rem;flex-wrap:wrap}
.btn{display:inline-block;padding:.75rem 1.5rem;border-radius:var(--radius);font-weight:700;border:0;cursor:pointer;font-size:1rem;transition:transform .18s cubic-bezier(.34,1.56,.64,1),background .18s}
.btn:active{transform:scale(.97)}
.btn-accent{background:var(--accent);color:#10283f}
.btn-accent:hover{background:#d97706}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.55)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.hero-grid{display:grid;grid-template-columns:1.35fr .9fr;gap:3rem;align-items:center}
.hero-grid>*{min-width:0}
.hero-fig{border-radius:var(--radius);overflow:hidden;box-shadow:0 20px 50px rgba(0,0,0,.35)}
.hero-fig figcaption{font-size:.8rem;color:#93a7bd;padding:.6rem 1rem;background:rgba(255,255,255,.05)}

/* ---------- sections ---------- */
.sec-alt{background:var(--surface)}
.sec-dark{background:var(--dark);color:#e7eef5}
.sec-dark h2,.sec-dark h3{color:#fff}
.sec-dark .kicker{color:var(--accent)}
.two-col{display:grid;grid-template-columns:2fr 1fr;gap:2.5rem;align-items:start}
.two-col>*{min-width:0}
.side-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem;margin-bottom:1.4rem}
.side-card h3{margin-top:0;font-size:1.05rem}
.side-card ul{margin:0;padding-left:1.2rem}
.side-card li{margin-bottom:.55rem;font-size:.94rem}
.sec-dark .side-card{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.12)}
.sticky{position:sticky;top:84px}

/* ---------- comparison matrix (signature) ---------- */
.matrix-scroll{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:var(--surface)}
table.matrix{border-collapse:collapse;width:100%;min-width:640px;font-size:.95rem}
table.matrix th,table.matrix td{padding:.9rem 1rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.matrix thead th{background:var(--primary);color:#fff;font-weight:700}
table.matrix tbody th{color:var(--primary);font-weight:700;white-space:nowrap;background:var(--bg)}
table.matrix td .mono{font-size:.88rem}
table.matrix tbody tr{transition:background .16s cubic-bezier(.4,0,.2,1)}
table.matrix tbody tr:hover{background:#FFF7E8}
.winner{color:#b45309;font-weight:700}
.matrix-note{font-size:.85rem;color:var(--muted);margin-top:.8rem}
.matrix-note .mono{font-size:.82rem}

/* ---------- data viz ---------- */
.viz-grid{display:grid;grid-template-columns:1fr 1fr;gap:2.5rem}
.viz-grid>*{min-width:0}
.bar-row{display:grid;grid-template-columns:15em 1fr 4.2em;gap:.8rem;align-items:center;margin-bottom:.65rem;font-size:.92rem}
.bar-row>*{min-width:0}
.bar-track{background:rgba(255,255,255,.12);border-radius:6px;height:1.15rem;overflow:hidden}
.bar-fill{height:100%;background:linear-gradient(90deg,var(--secondary),var(--accent));border-radius:6px;width:0;transition:width 1.1s cubic-bezier(.22,.61,.36,1)}
.bar-num{font-family:var(--mono);text-align:right}
.price-band{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px solid rgba(255,255,255,.14);padding:.7rem 0;font-size:.95rem}
.price-band .mono{color:var(--accent);font-weight:600}
.viz-cap{font-size:.85rem;color:#9fb2c6;margin-top:1rem}
@media (hover:hover){
  table.matrix tbody tr:hover td:first-child{border-left:3px solid var(--accent)}
  .card:hover{box-shadow:0 14px 34px rgba(30,58,95,.14)}
}

/* ---------- cards / trio ---------- */
.trio{display:grid;grid-template-columns:repeat(3,1fr);gap:1.6rem}
.trio>*{min-width:0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.7rem;transition:box-shadow .2s}
.card h3{margin-top:0}
.card img{border-radius:6px;margin-bottom:1rem}
.card p{font-size:.95rem;color:#374151}

/* ---------- product grid ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.3rem}
.prod-grid>*{min-width:0}
.prod{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.prod img{aspect-ratio:1/1;object-fit:cover;width:100%}
.prod-body{padding:1rem 1.1rem 1.2rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.prod-body h3{font-size:.95rem;margin:0;line-height:1.4;min-height:3.9em}
.prod-price{font-family:var(--mono);color:#b45309;font-weight:600;font-size:.95rem}
.prod-price small{color:var(--muted);font-weight:400;font-family:var(--font)}
.prod-cta{margin-top:auto}
.btn-sm{padding:.5rem 1rem;font-size:.88rem}

/* ---------- verdict checklist ---------- */
.verdict{list-style:none;margin:1.2rem 0 0;padding:0;display:grid;gap:.9rem}
.verdict li{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;padding:1rem 1.2rem;font-size:.96rem}

/* ---------- article ---------- */
.article{display:grid;grid-template-columns:2fr 1fr;gap:2.8rem;align-items:start}
.article>*{min-width:0}
.article-body{font-size:1.02rem}
.article-body h2{margin-top:2.4rem;padding-top:1.4rem;border-top:1px solid var(--line)}
.article-meta{color:var(--muted);font-size:.9rem;margin-bottom:1.6rem}
.toc{list-style:none;margin:0;padding:0}
.toc li{margin-bottom:.5rem;font-size:.92rem}
.blog-list{display:grid;gap:1.6rem}
.blog-teaser{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.8rem}
.blog-teaser h2{margin:.3rem 0 .5rem;font-size:1.4rem}
.blog-teaser p{color:#374151}

/* ---------- forms ---------- */
.contact-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:2.5rem;align-items:start}
.contact-grid>*{min-width:0}
.form-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:2rem}
.field{margin-bottom:1.1rem}
.field label{display:block;font-weight:600;margin-bottom:.35rem;font-size:.95rem}
.field input,.field textarea,.field select{width:100%;padding:.7rem .9rem;border:1px solid #cbd5e1;border-radius:8px;font:inherit;font-size:.98rem}
.field input:focus,.field textarea:focus,.field select:focus{outline:2px solid var(--secondary);border-color:var(--secondary)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.contact-facts{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem}
.contact-facts dt{font-weight:700;color:var(--primary);margin-top:.9rem}
.contact-facts dd{margin:.15rem 0 0}

/* ---------- footer ---------- */
.site-footer{background:var(--primary);color:#dbe6f1;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:2rem;padding:3.2rem 0 2rem}
.foot-grid>*{min-width:0}
.foot-brand{font-size:1.25rem;font-weight:700;color:#fff;margin-bottom:.8rem}
.foot-brand span{color:var(--accent)}
.site-footer h4{color:#fff;font-size:.95rem;margin:0 0 .7rem;letter-spacing:.04em}
.site-footer a{color:#c3d3e4;border:0;display:block;margin-bottom:.45rem;font-size:.94rem}
.site-footer a:hover{color:#fff}
.site-footer p{font-size:.92rem;color:#a9bcd0}
.foot-base{border-top:1px solid rgba(255,255,255,.15);padding:1.2rem 0;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.85rem;color:#8fa3b8}

/* ---------- breadcrumbs ---------- */
.crumb{font-size:.88rem;color:var(--muted);margin-bottom:1rem}
.crumb a{border:0}

/* ---------- misc ---------- */
.count-up{font-family:var(--mono);font-size:2.2rem;font-weight:600;color:var(--accent)}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.4rem;margin:2rem 0}
.stat-grid>*{min-width:0}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem;text-align:center}
.stat small{color:var(--muted);display:block;margin-top:.4rem;font-size:.85rem}
.band-cta{background:var(--dark);border-radius:var(--radius);padding:2.6rem;display:flex;align-items:center;justify-content:space-between;gap:1.5rem;flex-wrap:wrap;color:#eef3f8}
.band-cta h2{color:#fff;margin:0}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s cubic-bezier(.22,.61,.36,1),transform .6s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}
.thanks-box{max-width:640px;margin:0 auto;text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:3rem 2rem}
.e404{text-align:center;padding:5rem 0}
.e404 h1{font-size:4rem}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .prod-grid{grid-template-columns:repeat(3,1fr)}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  /* 861–1100px 导航防溢出：收紧间距与字号（CSS 层修复，待真实浏览器复核） */
  .header-in{gap:.9rem}
  .brand{font-size:1.05rem}
  .main-nav{gap:.55rem}
  .main-nav a{font-size:.85rem;padding:.4rem .1rem}
  .nav-drop>button{font-size:.85rem;padding:.4rem .1rem}
  .nav-cta{font-size:.85rem;padding:.5rem .8rem!important}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--primary);flex-direction:column;align-items:stretch;padding:1rem 1.5rem 1.5rem;gap:.2rem;border-top:1px solid rgba(255,255,255,.15)}
  .main-nav.open{display:flex}
  .main-nav a,.nav-drop>button{padding:.7rem 0;font-size:1.02rem;text-align:left;width:100%}
  .drop-menu{position:static;display:block;box-shadow:none;background:transparent;border:0;padding:0 0 0 1rem}
  .drop-menu a{color:#dbe6f1;padding:.5rem 0}
  .nav-cta{text-align:center;margin-top:.6rem}
  .hero-grid,.two-col,.article,.contact-grid,.viz-grid{grid-template-columns:1fr}
  .trio{grid-template-columns:1fr}
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .sticky{position:static}
  .bar-row{grid-template-columns:9em 1fr 3.6em}
  section{padding:52px 0}
}
@media (max-width:640px){
  .prod-grid{grid-template-columns:1fr}
  .prod-body h3{min-height:0}
  .foot-grid{grid-template-columns:1fr}
  /* 手机端数据图解转纵向条形（DESIGN §3） */
  .bar-chart{display:flex;align-items:stretch;gap:.35rem;height:235px;margin-top:.6rem}
  .bar-chart .bar-row{flex:1 1 0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:.3rem;margin:0;min-width:0}
  .bar-chart .bar-num{order:1;font-size:.6rem;text-align:center}
  .bar-chart .bar-track{order:2;width:1.3rem;height:105px;flex:none;display:flex;align-items:flex-end}
  .bar-chart .bar-fill{width:100%!important;height:var(--h,0);transition:height 1.1s cubic-bezier(.22,.61,.36,1)}
  .bar-chart .bar-row>span:first-child{order:3;height:62px;max-width:62px;overflow:hidden;font-size:.58rem;line-height:1.3;white-space:nowrap;text-overflow:ellipsis;transform:rotate(-40deg);transform-origin:top right;text-align:right}
  .header-in{gap:1rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal{opacity:1;transform:none}
  .bar-fill{width:var(--w,100%)!important;height:var(--h,100%)!important}
}