/* =====================================================================
   Ivy Chairs — Anji Tianwei Steel-Plastic Products Co., Ltd. — zjtw.net
   Design family: F6 Technical / Spec (engineered seating)
   prefix: ivy   palette: forest green + gold   font: Spline Sans
   ===================================================================== */

:root{
  --primary:#4E6E58;        /* forest green */
  --primary-2:#3C5645;
  --primary-3:#2C4033;
  --accent:#E0A82E;         /* gold */
  --accent-dark:#B9821A;
  --dark:#161C18;
  --ink:#1B231D;
  --muted:#5C6A5F;
  --bg:#FFFFFF;
  --surface:#EEF2EE;
  --surface-2:#E2E9E2;
  --line:#D4DDD4;
  --line-strong:#B3C0B4;
  --radius:4px;
  --radius-sm:2px;
  --maxw:1180px;
  --font:'Spline Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --mono:'Spline Sans','Spline Sans Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow:0 1px 0 var(--line), 0 2px 10px rgba(22,28,24,.05);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font);font-size:16.5px;line-height:1.62;font-weight:400;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font);font-weight:600;line-height:1.14;letter-spacing:-.012em;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.3vw,3rem);font-weight:700}
h2{font-size:clamp(1.45rem,2.8vw,2.05rem)}
h3{font-size:1.16rem}
p{margin:0 0 1em}
a{color:var(--primary-2);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%;display:block}
ul{margin:0 0 1em;padding-left:1.15em}
li{margin:.25em 0}
strong{font-weight:600}

/* layout */
.ivy-wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.ivy-section{padding:64px 0}
.ivy-section.alt{background:var(--surface)}
.ivy-section.dark{background:var(--dark);color:#D8E0D8}
.ivy-section.dark h2,.ivy-section.dark h3{color:#fff}
.ivy-eyebrow{
  font-family:var(--mono);font-size:.74rem;font-weight:600;letter-spacing:.2em;
  text-transform:uppercase;color:var(--accent-dark);margin:0 0 10px;display:flex;align-items:center;gap:10px;
}
.ivy-eyebrow::before{content:"";width:24px;height:2px;background:var(--accent);display:inline-block}
.dark .ivy-eyebrow{color:var(--accent)}
.ivy-lead{font-size:1.1rem;color:var(--muted);max-width:62ch}
.ivy-grid{display:grid;gap:18px}
@media(min-width:760px){.cols-2{grid-template-columns:1fr 1fr}.cols-3{grid-template-columns:repeat(3,1fr)}.cols-4{grid-template-columns:repeat(4,1fr)}}

/* buttons */
.ivy-btn{
  display:inline-flex;align-items:center;gap:8px;font-family:var(--font);
  font-weight:600;font-size:.95rem;letter-spacing:.01em;padding:12px 20px;
  border-radius:var(--radius);border:1px solid transparent;cursor:pointer;
  background:var(--accent);color:var(--dark);transition:.15s;text-decoration:none;
}
.ivy-btn:hover{background:var(--accent-dark);color:#fff;text-decoration:none}
.ivy-btn.ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.ivy-btn.ghost:hover{border-color:var(--primary);background:var(--surface);color:var(--ink)}
.dark .ivy-btn.ghost{color:#fff;border-color:rgba(255,255,255,.35)}
.dark .ivy-btn.ghost:hover{background:rgba(255,255,255,.08)}
.ivy-btn svg{width:18px;height:18px}

/* top bar (minimal) */
.ivy-top{background:var(--primary-3);color:#C3D2C5;font-family:var(--mono);font-size:.76rem;letter-spacing:.03em}
.ivy-top .ivy-wrap{display:flex;justify-content:space-between;align-items:center;height:34px;flex-wrap:wrap}
.ivy-top a{color:#C3D2C5}
.ivy-top a:hover{color:#fff}
.ivy-top .tspecs{display:flex;gap:18px}
.ivy-top .tspecs span{display:inline-flex;align-items:center;gap:6px}
.ivy-top svg{width:14px;height:14px;color:var(--accent)}
@media(max-width:640px){.ivy-top .tspecs{display:none}}

/* header */
.ivy-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.ivy-nav{display:flex;align-items:center;gap:24px;height:64px}
.ivy-logo{display:flex;align-items:center;gap:10px;font-family:var(--font);font-weight:700;font-size:1.18rem;color:var(--ink);letter-spacing:-.01em}
.ivy-logo:hover{text-decoration:none}
.ivy-logo .mark{width:36px;height:36px;flex:0 0 auto}
.ivy-logo .sub{display:block;font-family:var(--mono);font-size:.56rem;font-weight:500;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;margin-top:1px}
.ivy-menu{display:flex;gap:4px;margin-left:auto;align-items:center}
.ivy-menu a{font-family:var(--font);font-weight:500;font-size:.95rem;color:var(--ink);padding:8px 12px;border-radius:var(--radius)}
.ivy-menu a:hover{background:var(--surface);text-decoration:none}
.ivy-menu a[aria-current=page]{color:var(--primary-2)}
.ivy-menu a.cta{background:var(--primary);color:#fff;margin-left:6px}
.ivy-menu a.cta:hover{background:var(--primary-2)}
.ivy-burger{display:none;margin-left:auto;background:none;border:1px solid var(--line-strong);border-radius:var(--radius);width:42px;height:42px;cursor:pointer;color:var(--ink)}
.ivy-burger svg{width:22px;height:22px;margin:0 auto}
@media(max-width:900px){
  .ivy-burger{display:flex;align-items:center;justify-content:center}
  .ivy-menu{position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:8px;display:none;box-shadow:0 14px 24px rgba(22,28,24,.12)}
  .ivy-menu.open{display:flex}
  .ivy-menu a{padding:12px}
  .ivy-menu a.cta{margin:6px 0 0;text-align:center}
}

/* hero (spec-diagram) */
.ivy-hero{background:linear-gradient(155deg,#161C18 0%,#2C4033 58%,#3C5645 100%);color:#E7EEE7;position:relative;overflow:hidden}
.ivy-hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(224,168,46,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(224,168,46,.05) 1px,transparent 1px);background-size:36px 36px;pointer-events:none}
.ivy-hero .ivy-wrap{position:relative;z-index:2;display:grid;gap:38px;padding-top:60px;padding-bottom:60px}
@media(min-width:920px){.ivy-hero .ivy-wrap{grid-template-columns:1.08fr .92fr;align-items:center}}
.ivy-hero h1{color:#fff}
.ivy-hero .ivy-eyebrow{color:var(--accent)}
.ivy-hero p{color:#C2D0C3;font-size:1.1rem;max-width:54ch}
.ivy-hero .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
.ivy-hero .ivy-btn.ghost{color:#fff;border-color:rgba(255,255,255,.4)}
.ivy-hero .ivy-btn.ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}
.ivy-hero .quickspec{display:flex;gap:0;margin-top:30px;border:1px solid rgba(255,255,255,.16);border-radius:var(--radius);overflow:hidden;max-width:540px}
.ivy-hero .quickspec div{flex:1;padding:14px 16px;border-right:1px solid rgba(255,255,255,.12)}
.ivy-hero .quickspec div:last-child{border-right:0}
.ivy-hero .quickspec .n{font-family:var(--font);font-weight:700;font-size:1.5rem;color:#fff;line-height:1}
.ivy-hero .quickspec .l{font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;color:#9DB29F;margin-top:6px}

/* hero diagram panel */
.ivy-diagram{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:22px}
.ivy-diagram svg{width:100%;height:auto}
.ivy-diagram .cap{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:#9DB29F;margin-top:12px;display:flex;justify-content:space-between;border-top:1px solid rgba(255,255,255,.12);padding-top:10px}

/* hero product image variant */
.ivy-hero-img{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:14px}
.ivy-hero-img img{border-radius:var(--radius-sm);width:100%;height:auto;background:#F4F6F4}
.ivy-hero-img .cap{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:#9DB29F;margin-top:12px;display:flex;justify-content:space-between;border-top:1px solid rgba(255,255,255,.12);padding-top:10px}

/* spec-row cards (signature) */
.ivy-rows{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.ivy-row{display:grid;grid-template-columns:46px 1fr;gap:16px;padding:18px 20px;border-bottom:1px solid var(--line);align-items:start}
.ivy-row:last-child{border-bottom:0}
.ivy-row .ic{width:42px;height:42px;border:1px solid var(--line-strong);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:var(--primary);background:var(--surface)}
.ivy-row .ic svg{width:22px;height:22px}
.ivy-row h3{margin:0 0 4px;font-size:1.05rem}
.ivy-row p{margin:0;color:var(--muted);font-size:.96rem}
.ivy-row .pn{font-family:var(--mono);font-size:.72rem;letter-spacing:.07em;color:var(--accent-dark);text-transform:uppercase}

/* product card (real photo) */
.ivy-card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden;display:flex;flex-direction:column}
.ivy-card .fig{background:#F4F6F4;border-bottom:1px solid var(--line);position:relative;aspect-ratio:3/4;overflow:hidden}
.ivy-card .fig img{width:100%;height:100%;object-fit:contain}
.ivy-card .fig .tag{position:absolute;top:10px;left:10px;font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;background:var(--dark);color:#fff;padding:4px 8px;border-radius:var(--radius-sm)}
.ivy-card .body{padding:18px 18px 20px}
.ivy-card h3{margin:0 0 6px}
.ivy-card .pn{font-family:var(--mono);font-size:.72rem;color:var(--accent-dark);letter-spacing:.06em;text-transform:uppercase}
.ivy-card p{font-size:.95rem;color:var(--muted);margin:8px 0 0}
.ivy-card .mini{margin-top:14px;border-top:1px solid var(--line);padding-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:6px 16px;font-size:.85rem}
.ivy-card .mini b{font-family:var(--mono);font-weight:600;font-size:.66rem;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);display:block}

/* spec TABLE */
.ivy-table-wrap{border:1px solid var(--line);border-radius:var(--radius);overflow-x:auto;background:#fff}
table.ivy-spec{width:100%;border-collapse:collapse;font-size:.92rem;min-width:560px}
table.ivy-spec caption{caption-side:top;text-align:left;font-family:var(--mono);font-size:.72rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);padding:14px 16px 6px}
table.ivy-spec th,table.ivy-spec td{padding:11px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.ivy-spec thead th{background:var(--primary);color:#fff;font-family:var(--font);font-weight:600;font-size:.78rem;letter-spacing:.05em;text-transform:uppercase}
table.ivy-spec tbody tr:nth-child(even){background:var(--surface)}
table.ivy-spec td:first-child{font-family:var(--mono);font-weight:600;color:var(--ink)}
table.ivy-spec .num{font-family:var(--mono);color:var(--accent-dark);white-space:nowrap}
table.ivy-spec tbody tr:hover{background:var(--surface-2)}

/* key/value spec list */
.ivy-kv{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.ivy-kv div{display:flex;justify-content:space-between;gap:18px;padding:11px 16px;border-bottom:1px solid var(--line);font-size:.95rem}
.ivy-kv div:last-child{border-bottom:0}
.ivy-kv .k{font-family:var(--mono);font-size:.74rem;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin:0}
.ivy-kv .v{margin:0;font-weight:500;text-align:right}

/* feature/cert tiles */
.ivy-tile{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:22px}
.ivy-tile .ic{width:42px;height:42px;border-radius:var(--radius);background:var(--surface);display:flex;align-items:center;justify-content:center;color:var(--primary);margin-bottom:14px}
.ivy-tile .ic svg{width:24px;height:24px}
.ivy-tile h3{font-size:1.03rem}
.ivy-tile p{margin:0;color:var(--muted);font-size:.94rem}
.dark .ivy-tile{background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.14)}
.dark .ivy-tile p{color:#A9BBAB}
.dark .ivy-tile .ic{background:rgba(255,255,255,.06);color:var(--accent)}

/* process steps */
.ivy-steps{counter-reset:s;display:grid;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.ivy-steps li{counter-increment:s;list-style:none;display:grid;grid-template-columns:54px 1fr;gap:16px;padding:18px 20px;border-bottom:1px solid var(--line);margin:0}
.ivy-steps li:last-child{border-bottom:0}
.ivy-steps li::before{content:counter(s,decimal-leading-zero);font-family:var(--mono);font-weight:700;font-size:1.1rem;color:var(--accent-dark)}
.ivy-steps h3{margin:0 0 4px;font-size:1.03rem}
.ivy-steps p{margin:0;color:var(--muted);font-size:.95rem}

/* breadcrumb */
.ivy-crumb{font-family:var(--mono);font-size:.76rem;letter-spacing:.03em;color:var(--muted);padding:14px 0;text-transform:uppercase}
.ivy-crumb a{color:var(--muted)}
.ivy-crumb a:hover{color:var(--accent-dark)}
.ivy-crumb span{color:var(--ink)}

/* page banner */
.ivy-banner{background:var(--surface);border-bottom:1px solid var(--line)}
.ivy-banner .ivy-wrap{padding:30px 22px 40px}
.ivy-banner h1{margin:6px 0 10px}
.ivy-banner p{color:var(--muted);max-width:64ch;margin:0;font-size:1.05rem}

/* form */
.ivy-form{display:grid;gap:14px}
.ivy-form label{display:block;font-family:var(--mono);font-size:.74rem;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-bottom:5px}
.ivy-form input,.ivy-form textarea,.ivy-form select{
  width:100%;padding:11px 13px;border:1px solid var(--line-strong);border-radius:var(--radius);
  font-family:var(--font);font-size:1rem;background:#fff;color:var(--ink);
}
.ivy-form input:focus,.ivy-form textarea:focus,.ivy-form select:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}
.ivy-form textarea{min-height:120px;resize:vertical}
.ivy-form .row2{display:grid;gap:14px}
@media(min-width:600px){.ivy-form .row2{grid-template-columns:1fr 1fr}}
.ivy-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.ivy-form .captcha{display:flex;align-items:flex-end;gap:12px}
.ivy-form .captcha .q{font-family:var(--mono);font-weight:600;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:11px 13px;white-space:nowrap}
.ivy-form .captcha input{max-width:120px}
.ivy-note{font-size:.86rem;color:var(--muted)}
.form-msg{font-size:.95rem;padding:12px 14px;border-radius:var(--radius);display:none;margin-top:4px}
.form-msg.ok{display:block;background:#E7F2EA;border:1px solid #B8DCC2;color:#1F5C3A}
.form-msg.err{display:block;background:#FBE9E7;border:1px solid #F3C0B8;color:#9B2D1F}

/* contact list */
.ivy-contact-list{list-style:none;padding:0;margin:0}
.ivy-contact-list li{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}
.ivy-contact-list li:last-child{border-bottom:0}
.ivy-contact-list .ic{color:var(--primary);flex:0 0 auto}
.ivy-contact-list .ic svg{width:22px;height:22px}
.ivy-contact-list b{display:block;font-family:var(--mono);font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);font-weight:600}

/* faq */
.ivy-faq details{border:1px solid var(--line);border-radius:var(--radius);background:#fff;margin-bottom:10px}
.ivy-faq summary{cursor:pointer;padding:15px 18px;font-family:var(--font);font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
.ivy-faq summary::-webkit-details-marker{display:none}
.ivy-faq summary::after{content:"+";font-family:var(--mono);color:var(--accent-dark);font-size:1.3rem;line-height:1}
.ivy-faq details[open] summary::after{content:"\2212"}
.ivy-faq .ans{padding:0 18px 16px;color:var(--muted)}

/* callout */
.ivy-callout{border-left:3px solid var(--accent);background:var(--surface);padding:16px 18px;border-radius:0 var(--radius) var(--radius) 0;font-size:.96rem}
.ivy-callout b{font-weight:600}

/* footer */
.ivy-foot{background:var(--dark);color:#A9BBAB;font-size:.92rem;padding:52px 0 26px}
.ivy-foot h4{color:#fff;font-size:.8rem;font-family:var(--mono);letter-spacing:.11em;text-transform:uppercase;margin:0 0 14px}
.ivy-foot a{color:#A9BBAB}
.ivy-foot a:hover{color:#fff}
.ivy-foot .grid{display:grid;gap:30px}
@media(min-width:760px){.ivy-foot .grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr}}
.ivy-foot ul{list-style:none;padding:0;margin:0}
.ivy-foot li{margin:.4em 0}
.ivy-foot .logo{display:flex;align-items:center;gap:10px;color:#fff;font-family:var(--font);font-weight:700;font-size:1.1rem;margin-bottom:12px}
.ivy-foot .logo .mark{width:30px;height:30px}
.ivy-foot .bot{border-top:1px solid rgba(255,255,255,.12);margin-top:38px;padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-family:var(--mono);font-size:.74rem;letter-spacing:.03em;color:#7E9080}

/* reveal */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

/* utils */
.center{text-align:center}
.cta-band{background:var(--primary);color:#fff}
.cta-band h2{color:#fff}
.cta-band .ivy-btn{background:var(--accent);color:var(--dark)}
.cta-band .ivy-btn:hover{background:#fff;color:var(--primary-2)}
.cta-band .ivy-btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.cta-band .ivy-btn.ghost:hover{background:rgba(255,255,255,.12)}

/* ============ floating Telegram-style message widget ============ */
.ivy-fab{position:fixed;right:20px;bottom:20px;z-index:80;width:56px;height:56px;border-radius:50%;
  background:var(--primary);color:#fff;border:none;cursor:pointer;box-shadow:0 8px 22px rgba(22,28,24,.3);
  display:flex;align-items:center;justify-content:center}
.ivy-fab:hover{background:var(--primary-2)}
.ivy-fab svg{width:26px;height:26px}
.ivy-fab .dot{position:absolute;top:2px;right:2px;width:13px;height:13px;border-radius:50%;background:var(--accent);border:2px solid var(--primary)}
.ivy-chat{position:fixed;right:20px;bottom:88px;z-index:81;width:340px;max-width:calc(100vw - 40px);
  background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 18px 50px rgba(22,28,24,.28);
  display:none;overflow:hidden}
.ivy-chat.open{display:block}
.ivy-chat .head{background:var(--primary);color:#fff;padding:14px 16px;display:flex;align-items:center;gap:10px}
.ivy-chat .head .av{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.16);display:flex;align-items:center;justify-content:center}
.ivy-chat .head .av svg{width:20px;height:20px}
.ivy-chat .head b{display:block;font-size:.95rem;font-weight:600}
.ivy-chat .head small{color:#C2D0C3;font-size:.74rem}
.ivy-chat .head .x{margin-left:auto;background:none;border:none;color:#fff;cursor:pointer;font-size:1.3rem;line-height:1;padding:0 4px}
.ivy-chat .body{padding:14px 16px}
.ivy-chat .intro{background:var(--surface);border-radius:8px;padding:10px 12px;font-size:.88rem;color:var(--ink);margin-bottom:12px}
.ivy-chat .ivy-form{gap:10px}
.ivy-chat label{margin-bottom:3px}
.ivy-chat textarea{min-height:74px}
.ivy-chat .ivy-btn{width:100%;justify-content:center}
.ivy-chat .ivy-note{font-size:.74rem;margin:6px 0 0}
@media(max-width:480px){.ivy-chat{right:10px;left:10px;width:auto}}