/* Fungbillion — rebondedfoam.com | warm rust on warm paper, Fraunces + Inter */
:root{
  --primary:#7C2D12; --primary-dark:#5E2210; --secondary:#A8A29E; --accent:#C2410C;
  --accent-dark:#9A3412; --text:#292524; --text-muted:#78716C; --bg:#FAF7F2;
  --surface:#FFFFFF; --surface-alt:#F1ECE4; --border:#E7E0D5;
  --font-heading:"Fraunces",Georgia,"Noto Serif",serif;
  --font-body:"Inter",-apple-system,"Segoe UI",Roboto,sans-serif;
  --container:1200px; --section:88px; --gap:32px;
  --radius-card:14px; --radius-btn:10px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 10px 30px rgba(124,45,18,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--text);background:var(--bg);
  line-height:1.7;font-size:17px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
/* grid 子项防撑破（SOP 坑 27） */
.hero-grid>*,.cols>*,.ind-grid>*,.triad>*,.fact-grid>*,.faq-grid>*,.grade-row>*,.footer-grid>*,.form-row>*{min-width:0}
a{color:var(--primary);text-decoration:none}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--font-heading);line-height:1.25;color:var(--text);font-weight:600}
h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:16px}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem);margin-bottom:18px}
h3{font-size:1.2rem;margin-bottom:10px}
p{margin-bottom:16px}
ul.tick{list-style:none;margin:0 0 16px}
ul.tick li{position:relative;padding-left:30px;margin-bottom:10px}
ul.tick li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:700}
.section{padding:var(--section) 0}
.section.alt{background:var(--surface-alt)}
.lede{font-size:1.15rem;color:var(--text-muted);max-width:640px}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);margin-bottom:12px}

/* ---------- header / nav ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--bg);
  border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{font-family:var(--font-heading);font-size:1.45rem;font-weight:700;color:var(--primary)}
.brand small{display:block;font-family:var(--font-body);font-size:.68rem;font-weight:500;
  color:var(--text-muted);letter-spacing:.08em}
.main-nav{display:flex;align-items:center;gap:28px}
.main-nav a.nav-link{color:var(--text);font-weight:500;font-size:.98rem;position:relative}
.main-nav a.nav-link.active{color:var(--primary);font-weight:700}
.nav-item{position:relative}
.nav-drop{position:absolute;top:100%;left:-12px;min-width:240px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-card);box-shadow:var(--shadow);
  padding:10px;opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s}
.nav-item:hover .nav-drop,.nav-item:focus-within .nav-drop{opacity:1;visibility:visible;transform:none}
.nav-drop a{display:block;padding:9px 12px;border-radius:8px;color:var(--text);font-size:.95rem}
.nav-drop a:hover{background:var(--surface-alt);color:var(--primary)}
.nav-cta{margin-left:8px}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:10px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--text);margin:5px 0;
  transition:transform .2s var(--ease)}

/* ---------- buttons ---------- */
.btn{display:inline-block;padding:14px 28px;border-radius:var(--radius-btn);font-weight:600;
  font-size:1rem;border:0;cursor:pointer;transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(194,65,12,.28)}
.btn-primary:active{transform:scale(.97)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:active{transform:scale(.97)}
.btn-sm{padding:10px 20px;font-size:.92rem}

/* ---------- hero ---------- */
.hero{padding:72px 0 80px}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center}
.hero-img{border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow)}
.hero-img img{width:100%;object-fit:cover}
.hero-actions{display:flex;gap:16px;margin-top:28px;flex-wrap:wrap}
.hero-simple{padding:64px 0 40px;text-align:left}
.hero-simple .lede{max-width:720px}

/* ---------- industry cards ---------- */
.ind-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:36px}
.ind-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);
  padding:28px 22px;transition:transform .22s var(--ease),box-shadow .22s var(--ease)}
.ind-card h3{font-size:1.1rem;margin:14px 0 8px}
.ind-card p{font-size:.93rem;color:var(--text-muted);margin:0 0 14px}
.ind-icon{width:44px;height:44px;border-radius:12px;background:var(--surface-alt);
  display:flex;align-items:center;justify-content:center;color:var(--primary)}
.ind-icon svg{width:24px;height:24px}

/* ---------- triad ---------- */
.triad{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap);margin-top:36px}
.triad-step{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-card);padding:32px 28px;position:relative}
.triad-step .step-num{font-family:var(--font-heading);font-size:2.6rem;color:var(--secondary);
  line-height:1;margin-bottom:12px}
.triad-step h3{margin-bottom:12px}
.triad-step p{font-size:.95rem;margin-bottom:10px}
.triad-step .lbl{font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--accent);margin:14px 0 4px}

/* ---------- two-col layout ---------- */
.cols{display:grid;grid-template-columns:8fr 4fr;gap:56px;align-items:start}
.sidebar{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.side-card{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-card);padding:28px}
.side-card h3{font-size:1.05rem;margin-bottom:12px}
.side-card ul{list-style:none}
.side-card li{margin-bottom:10px;font-size:.95rem}
.boundary{background:var(--primary);color:#FDF8F2;border:0}
.boundary h3{color:#fff}
.boundary p{font-size:.94rem;color:#F3E7DA;margin:0}

/* ---------- grade rows ---------- */
.grade-row{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center;
  padding:44px 0;border-top:1px solid var(--border)}
.grade-row:first-child{border-top:0}
.grade-row img{border-radius:var(--radius-card);box-shadow:var(--shadow)}
.grade-row.flip{grid-template-columns:7fr 5fr}
.grade-row.flip img{order:2}

/* ---------- pitfalls ---------- */
.pitfall{background:var(--surface);border-left:4px solid var(--accent);
  border-radius:0 var(--radius-card) var(--radius-card) 0;padding:22px 26px;margin-bottom:18px}
.pitfall h3{font-size:1.08rem;margin-bottom:6px}
.pitfall p{margin:0;font-size:.95rem}

/* ---------- fact band ---------- */
.fact-band{background:var(--primary);color:#FDF8F2}
.fact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap);text-align:center}
.fact-grid .num{font-family:var(--font-heading);font-size:2.4rem;font-weight:700}
.fact-grid .cap{font-size:.92rem;color:#EAD9C8;margin-top:6px}

/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px 48px;margin-top:32px}
.faq-item{margin-bottom:6px}
.faq-item h3{font-size:1.06rem;margin-bottom:8px}
.faq-item p{font-size:.95rem;color:var(--text-muted);margin:0}
details.faq{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-card);padding:20px 24px;margin-bottom:12px}
details.faq summary{cursor:pointer;font-weight:600;font-family:var(--font-heading);font-size:1.05rem}
details.faq p{margin:12px 0 0;font-size:.95rem;color:var(--text-muted)}

/* ---------- cta band ---------- */
.cta-band{background:var(--primary);color:#FDF8F2;text-align:center}
.cta-band h2{color:#fff;max-width:720px;margin:0 auto 14px}
.cta-band p{color:#EAD9C8;max-width:640px;margin:0 auto 28px}
.cta-band .btn-primary{background:#fff;color:var(--primary);box-shadow:none}

/* ---------- footer ---------- */
.site-footer{background:#241611;color:#D6C9BC;padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.site-footer h4{color:#fff;font-size:1rem;margin-bottom:16px;font-family:var(--font-body)}
.site-footer a{color:#D6C9BC;font-size:.94rem}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:10px}
.footer-brand{font-family:var(--font-heading);font-size:1.3rem;color:#fff;margin-bottom:12px}
.footer-bottom{border-top:1px solid #3A2A20;margin-top:48px;padding:22px 0;
  display:flex;justify-content:space-between;font-size:.85rem;color:#A89880;flex-wrap:wrap;gap:8px}

/* ---------- forms ---------- */
.form-card{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-card);padding:40px;box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{margin-bottom:20px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:8px}
.field input,.field select,.field textarea{width:100%;padding:13px 15px;border:1px solid var(--border);
  border-radius:var(--radius-btn);font:inherit;background:#fff;color:var(--text)}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.field textarea{min-height:140px;resize:vertical}
.honeypot{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.88rem;color:var(--text-muted);margin-top:16px}
.contact-card{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-card);padding:32px;margin-bottom:20px}
.contact-card h3{margin-bottom:14px}
.contact-card p{margin-bottom:10px;font-size:.96rem}

/* ---------- blog / misc ---------- */
.post-card{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-card);padding:32px;margin-bottom:20px}
.post-card .tag{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent)}
.soon{font-size:.85rem;color:var(--text-muted);font-style:italic}
.breadcrumb{font-size:.88rem;color:var(--text-muted);margin-bottom:20px}
.breadcrumb a{color:var(--text-muted)}
.check-table{width:100%;border-collapse:collapse;margin:0 0 20px;font-size:.95rem}
.check-table th,.check-table td{border:1px solid var(--border);padding:12px 14px;text-align:left}
.check-table th{background:var(--surface-alt);font-weight:600}
.table-wrap{overflow-x:auto;max-width:100%}

/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}
html.no-js .reveal{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .ind-grid{grid-template-columns:repeat(3,1fr)}
  .cols{grid-template-columns:1fr;gap:40px}
  .sidebar{position:static}
  .triad{grid-template-columns:1fr}
  .fact-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .ind-grid{grid-template-columns:1fr 1fr}
  .faq-grid{grid-template-columns:1fr}
  .grade-row,.grade-row.flip{grid-template-columns:1fr}
  .grade-row.flip img{order:0}
  .form-row{grid-template-columns:1fr}
}
@media (max-width:899px){
  .main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--surface);
    flex-direction:column;align-items:stretch;padding:12px 24px 24px;gap:0;
    border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
  .main-nav.open{display:flex}
  .main-nav .nav-item{border-bottom:1px solid var(--border)}
  .main-nav a.nav-link{display:block;padding:14px 0}
  .nav-drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;
    border:0;padding:0 0 8px 12px;display:none}
  .nav-item.expanded .nav-drop{display:block}
  .nav-toggle{display:block}
  .nav-cta{margin:12px 0 0}
  .nav-cta .btn{width:100%;text-align:center}
  .ind-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:56px 0}
}

/* hover 门控：触屏防误触 */
@media (hover: hover){
  .btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px)}
  .btn-outline:hover{background:var(--primary);color:#fff}
  .ind-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
  .main-nav a.nav-link:hover{color:var(--primary)}
}

/* 动效降级 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}