/* ============================================================
   DAAN Bitumen — V1.3 professional B2B design system
   Deep ink navy + steel slate + one amber accent.
   System fonts only. No external assets.
   ============================================================ */
:root{
  --navy:#0c1a2e; --navy-2:#10233c; --navy-3:#16304f;
  --ink:#22303e; --slate:#43536a; --mut:#68788c; --faint:#93a3b5;
  --amber:#d97706; --amber-2:#f59e0b; --amber-ink:#231a00;
  --bg:#f6f4f0; --bg-soft:#faf9f6; --line:#e0e4ea; --line-soft:#e9edf2;
  --card:#ffffff;
  --ok:#a33b32; /* price up — muted red (CN convention) */
  --down:#2e7d4f; /* price down — muted green */
  --wa:#1faa55; --wa-d:#178a44;
  --radius:12px;
  --shadow-hover:0 14px 34px rgba(12,26,46,.13);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  --num:"SF Mono","Cascadia Mono",Consolas,"Roboto Mono",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:#fff;line-height:1.65;font-size:15.5px;-webkit-font-smoothing:antialiased}
a{color:#175b9e;text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}
img{max-width:100%}
::selection{background:rgba(245,158,11,.35)}

/* ---------- typography ---------- */
h1{font-size:34px;line-height:1.18;margin:0 0 12px;color:var(--navy);letter-spacing:-.02em;font-weight:750}
h2{font-size:26px;line-height:1.25;margin:34px 0 12px;color:var(--navy);letter-spacing:-.015em;font-weight:700}
h3{font-size:16.5px;margin:0 0 6px;color:var(--navy);font-weight:650}
p{margin:0 0 12px}
.lead{font-size:17px;color:var(--slate);max-width:780px;line-height:1.6}
.section-sub{color:var(--mut);margin-top:0;max-width:760px}
.eyebrow{display:block;font-size:11.5px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--amber);margin:0 0 8px}
.eyebrow.slate{color:var(--mut)}
.section-head{margin:0 0 20px}
.section-head h2{margin:0 0 8px}
.section-head .lead,.section-head .section-sub{margin:0}
.num,.price-big,.spec-table td,.hero-stats strong{font-variant-numeric:tabular-nums}

/* ---------- utility bar + ticker ---------- */
.utility-bar{background:var(--navy);color:#c4d2e2;font-size:13px;border-bottom:1px solid rgba(255,255,255,.08)}
.utility-in{display:flex;align-items:center;justify-content:space-between;gap:10px 26px;flex-wrap:wrap;padding-top:7px;padding-bottom:7px}
.utility-contact{display:flex;gap:8px 20px;flex-wrap:wrap;align-items:center;white-space:nowrap}
.utility-contact b{color:#fff;font-weight:650}
.utility-contact a{color:#fff;font-weight:650}
.utility-contact .sep{color:#47617f}
.ticker{display:flex;gap:8px 20px;flex-wrap:wrap;align-items:center}
.ticker a{display:flex;gap:8px 20px;flex-wrap:wrap;align-items:center;color:#c4d2e2}
.ticker a:hover{text-decoration:none;color:#fff}
.ticker .tick-label{font-size:10.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--amber-2)}
.ticker b{color:#fff;font-weight:650;font-variant-numeric:tabular-nums}
.ticker .tick-item{white-space:nowrap}
.ticker .tick-date{color:#8298ae;white-space:nowrap}
.ticker .tick-more{color:var(--amber-2);font-weight:600;white-space:nowrap}

/* ---------- header ---------- */
.site-header{background:#fff;position:sticky;top:0;z-index:50;border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(12,26,46,.02)}
.header-in{display:flex;align-items:center;justify-content:space-between;gap:14px 22px;padding-top:13px;padding-bottom:13px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:11px;color:var(--navy);font-size:21px;font-weight:800;letter-spacing:-.01em;line-height:1.05}
.logo:hover{text-decoration:none;color:var(--navy)}
.logo-mark{flex:0 0 auto;width:15px;height:15px;background:var(--amber-2);transform:rotate(45deg);border-radius:3px;box-shadow:inset 0 0 0 2px rgba(12,26,46,.18)}
.logo-text span{display:block;font-size:10px;font-weight:650;color:var(--mut);letter-spacing:.18em;text-transform:uppercase;margin-top:3px}
.main-nav{display:flex;gap:4px;align-items:center;flex-wrap:wrap}
.main-nav>a,.nav-drop>a{color:var(--slate);font-size:14.5px;font-weight:550;padding:8px 10px;border-bottom:2px solid transparent}
.main-nav>a:hover,.nav-drop>a:hover{color:var(--navy);text-decoration:none}
.main-nav>a.active,.nav-drop>a.active{color:var(--navy);border-bottom-color:var(--amber-2);font-weight:700}
.main-nav .nav-cta{background:var(--amber);color:#fff!important;padding:10px 17px;border-radius:8px;font-weight:650;margin-left:10px;border-bottom:none;box-shadow:0 4px 14px rgba(217,119,6,.28)}
.main-nav .nav-cta:hover{background:#bd6604;color:#fff}
.nav-drop{position:relative}
.drop-menu{display:none;position:absolute;top:calc(100% + 6px);left:0;background:#fff;min-width:220px;box-shadow:0 18px 40px rgba(12,26,46,.16);border:1px solid var(--line-soft);border-radius:10px;padding:6px;z-index:60}
.drop-menu a{display:block;color:var(--slate);padding:8px 12px;border-radius:6px;font-size:14px}
.drop-menu a:hover{background:var(--bg);color:var(--navy);text-decoration:none}
.nav-drop:hover .drop-menu,.nav-drop:focus-within .drop-menu{display:block}
.drop-menu{max-height:72vh;overflow-y:auto}
.drop-head{display:block;padding:10px 12px 2px;font-size:11px;font-weight:700;letter-spacing:.13em;text-transform:uppercase;color:#b45309}
.foot-head{display:block;color:#fff;font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;margin:11px 0 5px;opacity:.8}
.foot-head:first-of-type{margin-top:0}
.side-head{font-weight:700;color:var(--navy);font-size:12.5px;letter-spacing:.09em;text-transform:uppercase;margin:13px 0 3px}
.side-box .side-head:first-of-type{margin-top:2px}

/* ---------- hero ---------- */
.hero{background:
  repeating-linear-gradient(0deg,rgba(255,255,255,.045) 0 1px,transparent 1px 56px),
  repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 56px),
  linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 58%,var(--navy-3) 100%);
  color:#fff;position:relative;overflow:hidden}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.32}
.hero-in{position:relative;padding:76px 22px 64px}
.hero .eyebrow{color:var(--amber-2)}
.hero h1{font-size:43px;line-height:1.14;max-width:840px;color:#fff;font-weight:800}
.hero-sub{font-size:18px;color:#ccd9e8;max-width:730px;line-height:1.6}
.hero-btns{display:flex;gap:12px;margin:26px 0 18px;flex-wrap:wrap}
.hero-points{display:flex;gap:10px 24px;flex-wrap:wrap;color:#b9cbdf;font-size:14px}
.hero-points span::before{content:"✓";color:var(--amber-2);font-weight:800;margin-right:7px}
.hero-stats{display:flex;gap:12px 0;flex-wrap:wrap;margin-top:30px;padding-top:20px;border-top:1px solid rgba(255,255,255,.18);font-size:14.5px;color:#b9cbdf}
.hero-stats span{padding:0 22px;border-left:1px solid rgba(255,255,255,.16)}
.hero-stats span:first-child{padding-left:0;border-left:none}
.hero-stats strong{color:#fff;font-size:20px;font-weight:750;margin-right:5px}

/* ---------- buttons ---------- */
.btn{display:inline-block;padding:12px 22px;border-radius:8px;font-weight:650;font-size:15px;line-height:1.3;border:1.5px solid transparent;transition:background .15s ease,border-color .15s ease,color .15s ease;text-align:center}
.btn:hover{text-decoration:none}
.btn-amber{background:var(--amber);color:#fff;box-shadow:0 5px 16px rgba(217,119,6,.25)}
.btn-amber:hover{background:#bd6604;color:#fff}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-3);color:#fff}
.btn-ghost{border-color:var(--navy);color:var(--navy);background:transparent}
.btn-ghost:hover{background:var(--navy);color:#fff}
.btn-ghost.light{border-color:rgba(255,255,255,.75);color:#fff}
.btn-ghost.light:hover{background:#fff;color:var(--navy)}
.btn-wa{background:var(--wa);color:#fff}
.btn-wa:hover{background:var(--wa-d);color:#fff}

/* ---------- trust strip ---------- */
.trust-strip{background:#fff;color:var(--slate);border-bottom:1px solid var(--line)}
.trust-strip .wrap{display:flex;gap:10px 34px;flex-wrap:wrap;padding-top:13px;padding-bottom:13px;font-size:14px}
.trust-strip span{display:flex;align-items:center;gap:8px}
.trust-strip span::before{content:"";flex:0 0 auto;width:7px;height:7px;border-radius:2px;background:var(--amber-2);transform:rotate(45deg)}

/* ---------- sections & cards ---------- */
main>section.wrap{padding-top:56px;padding-bottom:14px}
main>section.wrap:first-of-type{padding-top:44px}
.band{background:var(--bg);padding:52px 0 46px;margin-top:44px;border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.band h2{margin-top:0}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:16px 0 10px}
.card-grid.small{grid-template-columns:repeat(2,1fr)}
.card-grid.four{grid-template-columns:repeat(4,1fr)}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;color:var(--ink);transition:box-shadow .18s ease,border-color .18s ease,transform .18s ease}
a.card:hover{border-color:#cdb894;text-decoration:none;box-shadow:var(--shadow-hover);transform:translateY(-2px)}
div.card:hover{border-color:#d8dee7}
.card p{color:var(--mut);font-size:14.5px;margin:0 0 10px}
.card-link{color:var(--amber);font-size:14px;font-weight:650}
a.card:hover .card-link{text-decoration:underline}
.badge{display:inline-block;background:rgba(245,158,11,.14);color:#9a5b00;border:1px solid rgba(217,119,6,.35);font-size:11px;font-weight:750;letter-spacing:.09em;text-transform:uppercase;padding:3px 9px;border-radius:999px;margin-bottom:11px}
.mini-specs{list-style:none;margin:0 0 12px;padding:11px 0 0;border-top:1px solid var(--line-soft);font-size:13.5px;color:var(--slate)}
.mini-specs li{display:flex;justify-content:space-between;gap:12px;padding:3px 0}
.mini-specs li span:first-child{color:var(--mut)}
.mini-specs li span:last-child{font-weight:600;color:var(--navy);font-variant-numeric:tabular-nums;text-align:right}
.region-group{margin:0 0 26px}
.region-label{font-size:11.5px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--mut);margin:0 0 10px;display:flex;align-items:center;gap:12px}
.region-label::after{content:"";flex:1;height:1px;background:var(--line)}
.market-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.market-card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;color:var(--ink)}
a.market-card:hover{border-color:#cdb894;box-shadow:var(--shadow-hover);text-decoration:none}
.market-card h3{margin-bottom:2px;font-size:16px}
.market-card p{color:var(--mut);font-size:13.5px;margin:0}
.market-cloud{display:flex;flex-wrap:wrap;gap:10px}
.market-cloud a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;color:var(--navy);font-weight:600;font-size:14.5px}
.market-cloud a:hover{border-color:var(--amber-2);text-decoration:none}

/* process steps */
.steps .card h3{color:var(--navy)}
.steps .card h3::first-letter{color:var(--amber)}

/* ---------- page head / content ---------- */
.page-head{background:var(--bg);border-bottom:1px solid var(--line);padding:40px 0 32px;margin-bottom:6px}
.page-head .lead{margin-bottom:0}
.crumb{color:var(--mut);font-size:12px;font-weight:650;letter-spacing:.1em;text-transform:uppercase;margin:0 0 12px}
.crumb a{color:var(--amber)}
.crumb a:hover{color:#bd6604}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:34px;align-items:start}
.content-main{min-width:0}
.content-main>h2:first-child,.content-main>p:first-child{margin-top:6px}
.article-body{max-width:840px}
.article-body ul,.content-main ul{padding-left:20px}
.article-body li,.content-main li{margin-bottom:5px}
.side-box{border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:18px;background:#fff;box-shadow:0 2px 10px rgba(12,26,46,.04)}
.side-box h3{margin-bottom:8px;padding-bottom:9px;border-bottom:2px solid rgba(245,158,11,.55)}
.side-box p{font-size:14.5px;color:var(--slate)}

/* ---------- tables ---------- */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:12px 0 6px;border:1px solid var(--line);border-radius:10px;background:#fff}
.table-scroll .spec-table{margin:0;border:none}
.spec-table{width:100%;border-collapse:collapse;margin:12px 0 6px;font-size:14.5px;background:#fff}
.spec-table th,.spec-table td{border-bottom:1px solid var(--line-soft);padding:10px 13px;text-align:left;vertical-align:top}
.spec-table thead th{background:var(--navy);color:#fff;font-size:12.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;border-bottom:none;padding:12px 13px}
.spec-table tbody tr:nth-child(even){background:var(--bg-soft)}
.spec-table tbody tr:hover{background:#fdf6e9}
.spec-table tbody th{background:transparent;width:32%;color:var(--navy);font-weight:650}
.spec-table td.num,.spec-table th.num{text-align:right}
.table-cap{color:var(--mut);font-size:13px;font-style:italic;margin-top:4px}
.article-body table{width:100%;border-collapse:collapse;font-size:14.5px;margin:12px 0}
.article-body th,.article-body td{border:1px solid var(--line);padding:9px 12px;text-align:left}

/* ---------- FAQ accordions ---------- */
.faq{border:1px solid var(--line);border-radius:10px;background:#fff;margin:0 0 10px;padding:0;overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:15px 44px 15px 18px;position:relative;font-weight:650;color:var(--navy);font-size:15.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);font-size:21px;font-weight:400;color:var(--amber);line-height:1}
.faq[open ] summary::after{content:"–"}
.faq summary:hover{background:var(--bg-soft)}
.faq p{padding:0 18px 16px;margin:0;color:var(--slate);font-size:14.5px}

/* ---------- prices ---------- */
.price-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:20px 0}
.price-card{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:#fff}
.price-card.highlight{border-color:rgba(217,119,6,.55);background:#fffbf3;box-shadow:0 10px 28px rgba(217,119,6,.10)}
.price-card h3{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--mut);margin-bottom:10px}
.price-big{font-size:40px;font-weight:800;color:var(--navy);letter-spacing:-.02em;line-height:1.1;font-variant-numeric:tabular-nums}
.price-big small{font-size:14px;color:var(--mut);font-weight:550;letter-spacing:0}
.price-usd{font-size:17px;font-weight:650;color:var(--navy)}
.price-meta{color:var(--slate);font-size:14px;font-variant-numeric:tabular-nums}
.chg{font-weight:700;font-variant-numeric:tabular-nums}
.chg.up{color:var(--ok)}
.chg.down{color:var(--down)}
.ref-note{background:#fff;border:1px solid rgba(217,119,6,.5);border-left:4px solid var(--amber-2);border-radius:8px;padding:12px 14px;font-size:14px;color:var(--slate)}
.disclaimer{background:var(--bg-soft);border:1px solid var(--line);border-left:4px solid var(--navy);border-radius:8px;padding:16px 18px;color:var(--slate);font-size:14px;margin:22px 0}
.disclaimer p:last-child{margin-bottom:0}
.source-line{color:var(--mut);font-size:13px}

/* ---------- videos ---------- */
.video-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.video-grid video{width:100%;border-radius:10px;background:#000}
.video-grid figcaption{font-size:14px;color:var(--mut);margin-top:6px}

/* ---------- forms ---------- */
.inquiry-form{display:block}
.inquiry-form label{display:block;font-size:13px;font-weight:650;letter-spacing:.02em;margin-bottom:13px;color:var(--slate)}
.inquiry-form input,.inquiry-form select,.inquiry-form textarea{display:block;width:100%;padding:11px 12px;border:1px solid #c6d0dc;border-radius:8px;font-size:15px;margin-top:6px;font-family:inherit;color:var(--ink);background:#fff;transition:border-color .15s ease,box-shadow .15s ease}
.inquiry-form input::placeholder,.inquiry-form textarea::placeholder{color:#a3b1c1}
.inquiry-form input:focus,.inquiry-form select:focus,.inquiry-form textarea:focus{border-color:var(--amber-2);box-shadow:0 0 0 3px rgba(245,158,11,.20);outline:none}
.inquiry-form button[type="submit"]{cursor:pointer;font-family:inherit;width:100%;margin-top:2px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-row label{margin-bottom:13px}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}
.form-note{font-size:13px;color:var(--mut);margin-top:12px}
.success-box{background:#eef7f0;border:1px solid #9cc7a8;border-left:4px solid var(--down);border-radius:10px;padding:16px 18px;margin-bottom:16px}
.error-box{background:#fbf0ef;border:1px solid #dfa49e;border-left:4px solid var(--ok);border-radius:10px;padding:16px 18px;margin-bottom:16px}
.success-box h2,.error-box h2{margin-top:0;font-size:20px}
.article-cta{border:1px solid rgba(217,119,6,.5);background:#fffbf3;border-radius:var(--radius);padding:22px;margin:28px 0}
.article-cta h2{margin-top:0}
.article-cta .btn{margin:4px 10px 0 0}

/* ---------- footer ---------- */
.site-footer{background:var(--navy);color:#b9c9db;margin-top:56px}
.foot-grid{display:grid;grid-template-columns:1.35fr .95fr 1fr .95fr 1.1fr;gap:28px;padding-top:42px;padding-bottom:28px}
.foot-grid h4{color:#fff;margin:0 0 13px;font-size:12.5px;font-weight:700;letter-spacing:.13em;text-transform:uppercase}
.foot-grid a{display:block;color:#b9c9db;font-size:14px;margin-bottom:7px}
.foot-grid a:hover{color:#fff;text-decoration:none}
.foot-grid p{font-size:14px;color:#9db1c6}
.foot-brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:#fff;margin-bottom:12px}
.foot-brand .logo-mark{width:13px;height:13px}
.qr{width:120px;height:120px;background:#fff;padding:4px;border-radius:8px}
.qr-cap{font-size:12px;color:#8499b0}
.foot-bar{border-top:1px solid rgba(255,255,255,.13);padding:15px 0;font-size:13px;color:#8499b0}
.foot-bar .wrap{display:flex;justify-content:space-between;gap:8px 24px;flex-wrap:wrap}
.wa-float{position:fixed;right:18px;bottom:18px;background:var(--wa);color:#fff;font-weight:700;padding:13px 20px;border-radius:999px;box-shadow:0 10px 26px rgba(12,26,46,.30);z-index:60}
.wa-float:hover{text-decoration:none;background:var(--wa-d);color:#fff}
.cta-band{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 60%,var(--navy-3) 100%);color:#fff;padding:46px 0;margin-top:48px}
.cta-band h2{color:#fff;margin-top:0}
.cta-band p{color:#ccd9e8}
.cta-band .btn{margin:4px 10px 0 0}

/* ---------- admin (keep usable under new system) ---------- */
.admin-wrap{max-width:860px}
.admin-wrap table{width:100%;border-collapse:collapse;font-size:14px}
.admin-wrap th,.admin-wrap td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}

/* ---------- responsive ---------- */
@media (max-width:1020px){
  .card-grid.four{grid-template-columns:repeat(2,1fr)}
  .market-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr 1fr}
}
@media (max-width:900px){
  .card-grid{grid-template-columns:1fr 1fr}
  .content-grid{grid-template-columns:1fr}
  .price-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .hero-in{padding:52px 22px 48px}
  .utility-in{justify-content:flex-start}
  .header-in{padding-top:11px;padding-bottom:11px}
}
@media (max-width:600px){
  body{font-size:15px}
  .card-grid,.card-grid.small,.card-grid.four,.market-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  h1{font-size:27px}
  h2{font-size:22px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .main-nav{gap:2px}
  .main-nav>a,.nav-drop>a{padding:7px 7px;font-size:14px}
  .main-nav .nav-cta{margin-left:4px;padding:9px 13px}
  .hero-stats span{padding:0 13px}
  .hero-stats span:first-child{padding-left:0}
  .ticker .tick-date{display:none}
  .utility-contact .sep{display:none}
  .price-big{font-size:33px}
}
.hero-photo{background-image:linear-gradient(100deg,rgba(8,18,34,.90) 25%,rgba(8,18,34,.62) 62%,rgba(8,18,34,.38)),var(--hero-photo);background-size:cover;background-position:center 62%}
@media print{
  .utility-bar,.site-header,.ticker,.site-footer,.wa-float{display:none!important}
}

/* ---------- multilingual (V1.4): language switcher + CJK ---------- */
.lang-switch{display:flex;align-items:center;gap:2px;white-space:nowrap}
.lang-switch a{color:#c4d2e2;padding:3px 9px;border-radius:20px;font-size:12.5px;font-weight:600;letter-spacing:.02em}
.lang-switch a:hover{color:#fff;background:rgba(255,255,255,.12)}
.lang-switch a.active{color:#0c1a2e;background:var(--amber,#f59e0b)}
html[lang="zh-CN"] body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC","Segoe UI",Roboto,Arial,sans-serif}
html[lang="zh-CN"] h1,html[lang="zh-CN"] h2,html[lang="zh-CN"] h3{letter-spacing:.01em}