/* Langbo Valve (Wenzhou) Co., Ltd. — brochure site */
:root{
  --bg:#F7F9FB; --paper:#FFFFFF; --dark:#1F3A52; --ink:#1B2A38;
  --gold:#B98A45; --gold-light:#C9A961; --muted:#6E8598;
  --line:#E5EAF0; --line2:#D9E0E6; --soft:#EEF2F6;
  --shadow:0 6px 24px rgba(31,58,82,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;
  font-size:16px; line-height:1.6; -webkit-font-smoothing:antialiased;
}
html[lang="ar"] body,html[dir="rtl"] body{font-family:Tahoma,Arial,sans-serif}
a{color:inherit;text-decoration:none}
button,input,select{font-family:inherit;font-size:inherit}
button{cursor:pointer}
img{display:block;max-width:100%}

/* ---------------- top bar ---------------- */
.topbar{
  position:sticky; top:0; z-index:30; background:var(--dark); color:#fff;
  display:flex; align-items:center; gap:20px; flex-wrap:wrap;
  padding:0 28px; height:64px; box-shadow:0 2px 12px rgba(0,0,0,.14);
}
.topbar .logo{font-size:18px;font-weight:700;letter-spacing:3px;color:var(--gold-light);white-space:nowrap}
.topbar .logo small{display:block;font-size:11px;letter-spacing:1px;color:#9FB0BE;font-weight:400}
.topbar .spacer{flex:1}
.topbar .langs{display:flex;gap:6px;flex-wrap:wrap}
.topbar .langs a{
  padding:5px 11px;border:1px solid rgba(255,255,255,.22);border-radius:20px;
  font-size:13px;color:#D9E0E6;transition:.18s;
}
.topbar .langs a:hover{border-color:var(--gold);color:#fff}
.topbar .langs a.on{background:var(--gold);border-color:var(--gold);color:#fff;font-weight:700}
.tb-btn{
  padding:7px 14px;border-radius:6px;border:1px solid rgba(255,255,255,.28);
  background:transparent;color:#fff;font-size:13px;transition:.18s;white-space:nowrap;
}
.tb-btn:hover{background:rgba(255,255,255,.12);border-color:var(--gold-light)}
.tb-btn.gold{background:var(--gold);border-color:var(--gold);font-weight:700}
.tb-btn.gold:hover{background:#a97b39}

/* ---------------- layout ---------------- */
.layout{display:flex;align-items:flex-start;max-width:1560px;margin:0 auto}
html[dir="rtl"] .layout{flex-direction:row-reverse}
.sidebar{
  width:270px;flex:0 0 270px;position:sticky;top:64px;height:calc(100vh - 64px);
  overflow-y:auto;background:var(--paper);border-right:1px solid var(--line);padding:22px 18px 40px;
}
html[dir="rtl"] .sidebar{border-right:0;border-left:1px solid var(--line)}
.sidebar h4{margin:0 0 14px;font-size:13px;letter-spacing:2px;color:var(--muted);font-weight:700;text-transform:uppercase}
.sec-group{margin-bottom:20px}
.sec-group .g-title{
  font-size:14px;font-weight:700;color:var(--dark);padding:7px 10px;
  background:var(--soft);border-radius:6px;margin-bottom:6px;
}
.sec-link{
  display:flex;gap:10px;align-items:baseline;padding:6px 10px;border-radius:6px;
  font-size:13.5px;color:#41586B;transition:.15s;
}
.sec-link:hover{background:#F0F4F8;color:var(--dark)}
.sec-link.on{background:#EAF0F6;color:var(--dark);font-weight:700;border-inline-start:3px solid var(--gold)}
.sec-link .n{color:var(--gold);font-size:12px;font-weight:700;min-width:22px}
.main{flex:1;min-width:0;padding:28px 32px 60px}
html[dir="rtl"] .main{text-align:right}

/* keep numeric page counters LTR even inside RTL (Arabic) pages */
.pg-num,.pager .pos,.pg-cover .corner,.pg-chapter .corner,.win-bar .wcount{
  direction:ltr;unicode-bidi:isolate;display:inline-block;
}

/* ---------------- pager ---------------- */
.pager{display:flex;align-items:center;gap:12px;margin:0 0 20px;flex-wrap:wrap}
.pager .btn{
  padding:9px 18px;border-radius:6px;border:1px solid var(--line2);background:var(--paper);
  color:var(--dark);font-size:14px;font-weight:600;transition:.18s;
}
.pager .btn:hover{border-color:var(--gold);color:var(--gold)}
.pager .btn:disabled{opacity:.4;cursor:not-allowed}
.pager .pos{font-size:14px;color:var(--muted);min-width:90px;text-align:center}
.pager .grow{flex:1}
.pager .view-toggle{display:flex;border:1px solid var(--line2);border-radius:6px;overflow:hidden}
.pager .view-toggle button{border:0;background:var(--paper);padding:9px 14px;color:var(--muted);font-size:13px}
.pager .view-toggle button.on{background:var(--dark);color:#fff;font-weight:700}

/* ---------------- pages ---------------- */
.pg{
  position:relative;background:var(--paper);border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--shadow);margin-bottom:26px;overflow:hidden;
}
.pg-head{display:flex;align-items:center;gap:16px;padding:22px 30px 16px;border-bottom:1px solid var(--line)}
html[dir="rtl"] .pg-head{flex-direction:row-reverse}
.pg-head .pg-num{font-size:13px;font-weight:700;letter-spacing:1px;color:var(--gold);white-space:nowrap}
.pg-head h2{margin:0;font-size:26px;line-height:1.3;color:var(--dark);font-weight:700;flex:1}
.pg-head .newwin{
  border:1px solid var(--line2);background:var(--soft);color:var(--dark);
  padding:7px 12px;border-radius:6px;font-size:12.5px;white-space:nowrap;
}
.pg-head .newwin:hover{border-color:var(--gold);color:var(--gold)}
.pg-body{padding:26px 30px 30px}
.note{font-size:13.5px;color:var(--muted);margin:16px 0 0;line-height:1.6}

/* cover & chapter */
.pg-cover,.pg-chapter{
  min-height:520px;color:#fff;display:flex;align-items:flex-end;
  background-size:cover;background-position:center;background-color:var(--dark);
}
.pg-cover::before,.pg-chapter::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(18,34,50,.94) 0%,rgba(18,34,50,.72) 52%,rgba(18,34,50,.24) 100%);
}
html[dir="rtl"] .pg-cover::before,html[dir="rtl"] .pg-chapter::before{
  background:linear-gradient(270deg,rgba(18,34,50,.94) 0%,rgba(18,34,50,.72) 52%,rgba(18,34,50,.24) 100%);
}
.pg-cover .inner,.pg-chapter .inner{position:relative;z-index:1;padding:56px 54px;width:100%}
.pg-cover .brand,.pg-chapter .brand{color:var(--gold-light);letter-spacing:4px;font-size:15px;font-weight:700;margin-bottom:22px}
.pg-cover h1{font-size:clamp(30px,4vw,58px);line-height:1.16;margin:0 0 20px;font-weight:700}
.pg-chapter .chapter-no{font-size:clamp(56px,8vw,96px);font-weight:700;line-height:1;color:#fff;margin:0 0 8px}
.pg-chapter h1{font-size:clamp(26px,3.4vw,40px);margin:0 0 18px;font-weight:700}
.rule{width:76px;height:3px;background:var(--gold);border-radius:2px;margin:0 0 20px}
.pg-cover .sub{font-size:clamp(17px,2vw,25px);margin:0 0 10px}
.pg-cover .place{font-size:15px;color:#D9E0E6;margin:0}
.pg-chapter .desc{font-size:19px;color:#E6EDF3;max-width:720px;margin:0}
.pg-cover .corner,.pg-chapter .corner{position:absolute;z-index:1;bottom:18px;right:26px;font-size:12px;color:#B9C7D2}
html[dir="rtl"] .pg-cover .corner,html[dir="rtl"] .pg-chapter .corner{right:auto;left:26px}

/* split / series / toc / intro */
.two-col{display:grid;grid-template-columns:1.15fr .85fr;gap:32px;align-items:start}
.two-col.rev{grid-template-columns:.85fr 1.15fr}
@media(max-width:900px){.two-col,.two-col.rev{grid-template-columns:1fr}}
.lead{font-size:20px;font-weight:700;color:var(--dark);margin:0 0 16px;line-height:1.4}
.para{margin:0 0 12px;font-size:16.5px;line-height:1.75}
.points{list-style:none;padding:0;margin:20px 0 0;border-top:1px solid var(--line)}
.points li{padding:11px 0 11px 16px;border-bottom:1px solid var(--line);color:var(--dark);font-size:15.5px;position:relative}
html[dir="rtl"] .points li{padding:11px 16px 11px 0}
.points li::before{content:"";position:absolute;left:0;top:19px;width:6px;height:6px;border-radius:50%;background:var(--gold)}
html[dir="rtl"] .points li::before{left:auto;right:0}
.figure{
  background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;
  display:flex;align-items:center;justify-content:center;min-height:280px;
}
.figure img{width:100%;height:auto;max-height:420px;object-fit:contain}
.series-no{font-size:44px;font-weight:700;color:var(--gold);line-height:1;margin:0 0 4px}
.series-en{font-size:14.5px;color:var(--muted);margin:0 0 16px}

/* toc */
.toc-list{list-style:none;padding:0;margin:18px 0 0}
.toc-list li{display:flex;gap:18px;align-items:baseline;padding:12px 4px;border-bottom:1px solid var(--line2);font-size:17px;color:var(--dark)}
.toc-list li .k{color:var(--gold);font-weight:700;font-size:16px;min-width:28px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:16px}
.cards.c2{grid-template-columns:repeat(2,1fr)}
.cards.c6{grid-template-columns:repeat(3,1fr)}
@media(max-width:900px){.cards,.cards.c2,.cards.c6{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.cards,.cards.c2,.cards.c6{grid-template-columns:1fr}}
.card{background:var(--paper);border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}
.card .ph{height:190px;background:#fff;border-bottom:1px solid var(--line);padding:10px;display:flex;align-items:center;justify-content:center}
.card.c6 .ph{height:165px}
.card .ph img{width:100%;height:100%;object-fit:contain}
.card .tx{padding:16px 18px 20px}
.card h3{margin:0 0 8px;font-size:18px;color:var(--dark);line-height:1.35}
.card p{margin:0;font-size:14.5px;line-height:1.6;color:var(--ink)}
.card .cap{margin:0;font-size:14.5px;color:var(--dark);text-align:center}
.bar-note{background:var(--soft);border-radius:8px;padding:14px 18px;margin-top:20px;color:var(--dark);font-size:15.5px}
.sub{font-size:16.5px;line-height:1.7;margin:0 0 4px}

/* intro cards */
.intro-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:16px 0 20px}
@media(max-width:800px){.intro-cards{grid-template-columns:1fr}}
.intro-cards .ic{border:1px solid var(--line);border-radius:10px;padding:16px 18px;background:var(--paper)}
.intro-cards h3{margin:0 0 8px;font-size:17px;color:var(--dark)}
.intro-cards p{margin:0;font-size:14.5px;line-height:1.6}

/* spec table */
.spec-table{width:100%;border-collapse:collapse;margin-top:16px;font-size:15.5px}
.spec-table th,.spec-table td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:start}
.spec-table th{background:var(--soft);color:var(--dark);font-weight:700}
.spec-table td:nth-child(2){color:var(--muted)}
.spec-table td:nth-child(3){color:var(--muted);font-size:14px}

/* quote */
.pg-quote{background:linear-gradient(135deg,#F2F6F9,#FFFFFF);border-inline-start:5px solid var(--gold);padding:56px 54px;min-height:330px;display:flex;flex-direction:column;justify-content:center;gap:22px}
html[dir="rtl"] .pg-quote{text-align:right}
.pg-quote .q{font-size:clamp(24px,3.2vw,40px);font-weight:700;color:var(--dark);line-height:1.3;margin:0}
.pg-quote .q3{font-size:clamp(20px,2.6vw,32px);color:var(--gold);font-weight:700;margin:0}

/* contact */
.pg-contact{background:var(--dark);color:#fff;display:grid;grid-template-columns:1fr 1fr;gap:40px;padding:48px 54px}
@media(max-width:800px){.pg-contact{grid-template-columns:1fr}}
.pg-contact .brand{color:var(--gold-light);letter-spacing:3px;font-size:14px;margin-bottom:18px}
.pg-contact h2{font-size:clamp(24px,3vw,38px);margin:0 0 18px;line-height:1.3}
.pg-contact .place{color:#D9E0E6;font-size:17px}
.pg-contact .cbox{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:26px 30px}
.pg-contact .cbox h3{margin:0 0 18px;font-size:21px}
.pg-contact .cbox ul{list-style:none;padding:0;margin:0}
.pg-contact .cbox li{padding:9px 0;font-size:16px;border-bottom:1px solid rgba(255,255,255,.09)}
.pg-contact .cbox li a:hover{color:var(--gold-light);text-decoration:underline}
.pg-contact .cbox .note{color:#9FB0BE;font-size:13px;margin-top:16px}

/* footer */
.site-footer{background:var(--dark);color:#C9D5DE;padding:22px 32px;font-size:13.5px}
.site-footer .fin{max-width:1560px;margin:0 auto;display:flex;gap:18px;flex-wrap:wrap;align-items:center}
.site-footer a:hover{color:var(--gold-light)}
.site-footer .sp{flex:1}

/* ---------------- window.html ---------------- */
.win-body{background:#EDF1F5}
.win-bar{
  position:sticky;top:0;z-index:40;background:var(--dark);color:#fff;
  padding:10px 20px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  box-shadow:0 2px 10px rgba(0,0,0,.16);
}
.win-bar .tag{font-size:13px;color:var(--gold-light);font-weight:700;letter-spacing:1px;margin-inline-end:8px}
.win-bar .grow{flex:1}
.win-bar .log{font-size:12.5px;color:#B9C7D2;min-width:150px}
.win-main{max-width:1180px;margin:22px auto 50px;padding:0 20px}
.win-main .pg{margin-bottom:0}
.win-tip{max-width:1180px;margin:14px auto 0;padding:0 20px;font-size:13px;color:var(--muted)}

/* ---------------- console ---------------- */
.console-body{background:#EEF2F6}
.console-wrap{max-width:1180px;margin:0 auto;padding:30px 24px 70px}
.console-hero{
  background:var(--dark);color:#fff;border-radius:14px;padding:36px 40px;margin-bottom:24px;
  background-image:linear-gradient(110deg,rgba(18,34,50,.96),rgba(31,58,82,.78)),url('assets/web/cover_factory.jpg');
  background-size:cover;background-position:center;
}
.console-hero .brand{color:var(--gold-light);letter-spacing:4px;font-size:14px;font-weight:700}
.console-hero h1{font-size:34px;margin:12px 0 10px;line-height:1.3}
.console-hero p{color:#D3DFE7;margin:0;font-size:15.5px;max-width:820px;line-height:1.7}
.console-hero .pills{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.console-hero .pills span{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:20px;padding:5px 14px;font-size:13px}
.c-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px 26px;margin-bottom:22px;box-shadow:var(--shadow)}
.c-card h2{margin:0 0 6px;font-size:21px;color:var(--dark)}
.c-card .desc{margin:0 0 20px;color:var(--muted);font-size:14.5px}
.lang-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
@media(max-width:800px){.lang-grid{grid-template-columns:repeat(2,1fr)}}
.lang-card{border:1px solid var(--line);border-radius:10px;padding:18px 16px;text-align:center;background:#FBFCFE;transition:.18s}
.lang-card:hover{border-color:var(--gold);transform:translateY(-2px)}
.lang-card .nm{font-size:18px;font-weight:700;color:var(--dark)}
.lang-card .cd{font-size:12px;color:var(--muted);letter-spacing:2px;margin:4px 0 14px}
.lang-card .go{display:block;background:var(--dark);color:#fff;border-radius:6px;padding:8px;font-size:13px;font-weight:600}
.lang-card .go:hover{background:var(--gold)}
.form-row{display:flex;gap:18px;flex-wrap:wrap;align-items:flex-end}
.form-row label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}
.form-row select,.form-row input{
  border:1px solid var(--line2);border-radius:6px;padding:9px 12px;background:#fff;color:var(--ink);min-width:110px;
}
.form-row .btns{display:flex;gap:10px;flex-wrap:wrap}
.btn-primary{background:var(--gold);border:1px solid var(--gold);color:#fff;font-weight:700;border-radius:6px;padding:10px 20px}
.btn-primary:hover{background:#a97b39}
.btn-ghost{background:#fff;border:1px solid var(--line2);color:var(--dark);border-radius:6px;padding:10px 18px}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.iter-log{
  margin-top:18px;background:#F5F8FA;border:1px solid var(--line);border-radius:8px;
  padding:14px 16px;font-family:Consolas,"Courier New",monospace;font-size:13px;
  color:#41586B;min-height:56px;max-height:170px;overflow-y:auto;white-space:pre-wrap;line-height:1.7;
}
.iter-log .ok{color:#1E7A4C}.iter-log .warn{color:#B4552D}.iter-log .hl{color:var(--gold);font-weight:700}
.win-table{width:100%;border-collapse:collapse;font-size:14px}
.win-table th{background:var(--soft);color:var(--dark);text-align:left;padding:10px 12px;font-size:13px}
html[dir="rtl"] .win-table th{text-align:right}
.win-table td{padding:9px 12px;border-bottom:1px solid var(--line)}
.win-table tr:hover td{background:#FAFCFE}
.win-table .tp{font-size:12px;color:var(--muted)}
.win-table a.mini{display:inline-block;border:1px solid var(--line2);border-radius:5px;padding:4px 10px;font-size:12.5px;color:var(--dark)}
.win-table a.mini:hover{border-color:var(--gold);color:var(--gold)}
.hint{background:#FFF8EC;border:1px solid #EBD9B8;border-radius:8px;padding:14px 18px;font-size:13.5px;color:#6B5730;line-height:1.8;margin-top:16px}
.hint b{color:#8A6420}