/* ============================================================
   源采 YUANCAI · Sourcing Agent — Styles
   Palette: low-saturation, multi-tone (slate / clay / sage / gold / cream)
   ============================================================ */
:root{
  --ink:#26303a;          /* deep slate — primary text */
  --ink-2:#3a4651;
  --navy:#2f4a6b;         /* muted blue — brand primary */
  --navy-deep:#243a54;
  --clay:#bd7b5b;         /* muted terracotta — accent / CTA */
  --clay-soft:#d8a585;
  --sage:#5e8b7e;         /* muted teal-green — secondary */
  --gold:#b08a4f;         /* muted gold — tertiary highlight */
  --cream:#f6f3ee;        /* warm off-white bg */
  --paper:#ffffff;
  --stone:#e7e1d8;        /* borders */
  --stone-2:#efebe4;
  --muted:#717b85;
  --muted-2:#9aa1a8;
  --shadow-sm:0 2px 10px rgba(38,48,58,.06);
  --shadow:0 10px 30px rgba(38,48,58,.10);
  --shadow-lg:0 24px 60px rgba(38,48,58,.14);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1200px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --serif:'Cormorant Garamond', Georgia, serif;
  --sans:'Manrope','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--cream);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.container-narrow{max-width:840px}
h1,h2,h3,h4{line-height:1.2;font-weight:800;letter-spacing:-.01em;color:var(--ink)}
em{font-style:normal;color:var(--clay)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--sans);font-weight:700;font-size:.95rem;
  padding:11px 22px;border-radius:999px;border:1px solid transparent;
  cursor:pointer;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s;white-space:nowrap;
}
.btn-lg{padding:14px 28px;font-size:1.02rem}
.btn-block{width:100%}
.btn-primary{background:var(--clay);color:#fff;box-shadow:0 8px 20px rgba(189,123,91,.30)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(189,123,91,.38);background:#b06f4f}
.btn-ghost{background:rgba(255,255,255,.65);color:var(--navy);border-color:rgba(47,74,107,.25)}
.btn-ghost:hover{background:#fff;transform:translateY(-2px);box-shadow:var(--shadow-sm)}

/* ---------- topbar ---------- */
.topbar{background:var(--navy-deep);color:#dde4ec;font-size:.82rem}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:40px}
.topbar-left,.topbar-right{display:flex;align-items:center;gap:18px}
.topbar-item a,.topbar-item{color:#c4cdd8}
.topbar-item.muted{color:#94a3b3}
.topbar a:hover{color:#fff}
.lang-switch{display:flex;gap:4px;background:rgba(255,255,255,.08);padding:3px;border-radius:999px}
.lang-switch button{
  border:0;background:transparent;color:#c4cdd8;font-family:var(--sans);font-weight:700;
  font-size:.78rem;padding:3px 10px;border-radius:999px;cursor:pointer;transition:.2s;
}
.lang-switch button.active{background:#fff;color:var(--navy-deep)}

/* ---------- header ---------- */
.header{position:sticky;top:0;z-index:50;background:rgba(246,243,238,.86);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:box-shadow .3s,border-color .3s,background .3s}
.header.scrolled{box-shadow:var(--shadow-sm);border-color:var(--stone)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:11px}
.brand-mark{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--navy),var(--sage));color:#fff;font-weight:900;font-size:1.25rem;
  font-family:'Noto Sans SC',sans-serif;box-shadow:var(--shadow-sm);
}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-text strong{font-size:1.18rem;font-weight:900;letter-spacing:.02em}
.brand-text em{font-style:normal;font-size:.66rem;letter-spacing:.18em;color:var(--muted);font-weight:600;text-transform:uppercase}
.nav{display:flex;gap:26px}
.nav a{font-weight:600;font-size:.94rem;color:var(--ink-2);position:relative;padding:6px 0;transition:color .2s}
.nav a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--clay);transition:width .3s var(--ease)}
.nav a:hover{color:var(--navy)}
.nav a:hover::after{width:100%}
.header-actions{display:flex;align-items:center;gap:14px}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.burger span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 600px at 85% -10%,rgba(94,139,126,.18),transparent 60%),
  radial-gradient(900px 500px at 5% 110%,rgba(189,123,91,.16),transparent 55%),
  linear-gradient(180deg,#eef2f6 0%,var(--cream) 100%);
  padding:64px 0 72px;
}
.hero-blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;z-index:0}
.blob-a{width:420px;height:420px;background:radial-gradient(circle,rgba(47,74,107,.25),transparent 70%);top:-80px;right:8%}
.blob-b{width:360px;height:360px;background:radial-gradient(circle,rgba(176,138,79,.22),transparent 70%);bottom:-120px;left:2%}
.hero-photo{position:absolute;inset:0;background:transparent url('images/hero.png') center/cover no-repeat;opacity:.16;z-index:0;mix-blend-mode:multiply}
.hero-photo::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(246,243,238,.4),rgba(246,243,238,.85))}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.55fr .9fr;gap:54px;align-items:center}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--navy);background:rgba(47,74,107,.08);padding:7px 14px;border-radius:999px}
.eyebrow-center{display:block;text-align:center;margin:0 auto 14px;width:max-content}
.hero-title{font-size:clamp(2.1rem,4.2vw,3.5rem);margin:20px 0 18px;letter-spacing:-.02em}
.hero-sub{font-size:1.06rem;color:var(--ink-2);max-width:560px}
.hero-cta{display:flex;gap:14px;margin:30px 0 16px;flex-wrap:wrap}
.hero-why-link{display:inline-block;margin:6px 0 34px;font-weight:700;font-size:.94rem;color:var(--navy);border-bottom:2px solid transparent;transition:border-color .25s,color .25s}
.hero-why-link:hover{color:var(--clay);border-color:var(--clay)}
.hero-stats{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:560px;border-top:1px solid var(--stone);padding-top:22px}
.hero-stats strong{display:block;font-family:var(--serif);font-size:2rem;font-weight:700;color:var(--navy);line-height:1}
.hero-stats span{font-size:.82rem;color:var(--muted)}

/* hero card */
.hero-card{background:var(--paper);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-lg);border:1px solid var(--stone-2)}
.hero-card h3{font-size:1.25rem;margin-bottom:4px}
.hero-card-sub{font-size:.9rem;color:var(--muted);margin-bottom:18px}
.mini-form{display:flex;flex-direction:column;gap:11px}
.mini-form input{border:1px solid var(--stone);border-radius:var(--radius-sm);padding:12px 14px;font-family:var(--sans);font-size:.92rem;background:var(--cream);transition:border .2s,box-shadow .2s}
.mini-form input:focus{outline:none;border-color:var(--clay);box-shadow:0 0 0 3px rgba(189,123,91,.14)}
.hero-card-note{font-size:.8rem;color:var(--sage);margin-top:14px;text-align:center;font-weight:600}

/* ---------- trust strip ---------- */
.trust-strip{background:var(--navy);color:#e7edf4}
.trust-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;padding:16px 24px;font-size:.9rem;font-weight:600}
.trust-inner span{color:#d6e0ea}

/* ---------- sections ---------- */
.section{padding:84px 0}
.section-alt{background:linear-gradient(180deg,var(--stone-2),var(--cream))}
.section-head{max-width:680px;margin:0 auto 50px;text-align:center}
.section-head h2{font-size:clamp(1.7rem,3vw,2.4rem);margin:12px 0 10px}
.section-lead{color:var(--muted);font-size:1.02rem}

/* ---------- services ---------- */
.grid-services{display:flex;flex-wrap:wrap;justify-content:center;gap:20px}
.svc{background:var(--paper);border:1px solid var(--stone-2);border-radius:var(--radius);padding:26px 22px;transition:transform .3s var(--ease),box-shadow .3s, border-color .3s;position:relative;overflow:hidden;flex:0 1 calc(25% - 15px);min-width:0}
.svc::before{content:"";position:absolute;inset:0;background:linear-gradient(160deg,rgba(47,74,107,.05),transparent 40%);opacity:0;transition:opacity .3s}
.svc:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--clay-soft)}
.svc:hover::before{opacity:1}
.svc-ico{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;margin-bottom:16px;color:#fff}
.svc-ico svg{width:26px;height:26px}
.svc:nth-child(8n+1) .svc-ico{background:linear-gradient(135deg,var(--navy),#3d618a)}
.svc:nth-child(8n+2) .svc-ico{background:linear-gradient(135deg,var(--clay),var(--clay-soft))}
.svc:nth-child(8n+3) .svc-ico{background:linear-gradient(135deg,var(--sage),#7aa897)}
.svc:nth-child(8n+4) .svc-ico{background:linear-gradient(135deg,var(--gold),#c7a368)}
.svc:nth-child(8n+5) .svc-ico{background:linear-gradient(135deg,#4a6b8a,var(--navy))}
.svc:nth-child(8n+6) .svc-ico{background:linear-gradient(135deg,#b9805f,var(--clay))}
.svc:nth-child(8n+7) .svc-ico{background:linear-gradient(135deg,#5f8b7a,var(--sage))}
.svc:nth-child(8n+8) .svc-ico{background:linear-gradient(135deg,#a8854d,var(--gold))}
.svc h3{font-size:1.08rem;margin-bottom:8px}
.svc p{font-size:.88rem;color:var(--muted);line-height:1.55}

/* ---------- product categories ---------- */
.grid-cats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cat{background:var(--paper);border:1px solid var(--stone-2);border-radius:var(--radius);transition:transform .3s var(--ease),box-shadow .3s,border-color .3s;display:flex;flex-direction:column;position:relative;overflow:hidden}
.cat-img{height:160px;background-size:cover;background-position:center;background-color:var(--stone-2);border-bottom:1px solid var(--stone-2)}
.cat-body{display:flex;flex-direction:column;gap:14px;padding:22px 22px 24px;flex:1}
.cat::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,var(--navy),var(--sage));opacity:0;transition:opacity .3s}
.cat:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--clay-soft)}
.cat:hover::before{opacity:1}
.cat-top{display:flex;align-items:center;gap:14px}
.cat-ico{width:48px;height:48px;flex:none;border-radius:14px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--navy),var(--sage));box-shadow:0 6px 16px rgba(47,74,107,.22)}
.cat-ico svg{width:24px;height:24px}
.cat h3{font-size:1.08rem;line-height:1.3}
.cat-desc{font-size:.82rem;color:var(--muted)}
.cat-tags{list-style:none;display:flex;flex-wrap:wrap;gap:7px;margin-top:auto;padding-top:8px}
.cat-tag{font-size:.76rem;background:var(--cream);border:1px solid var(--stone);padding:4px 11px;border-radius:999px;color:var(--ink-2);transition:border-color .2s,color .2s}
.cat-tag:hover{border-color:var(--clay);color:var(--clay)}
.cat:nth-child(9n+1) .cat-ico{background:linear-gradient(135deg,var(--navy),#3d618a)}
.cat:nth-child(9n+2) .cat-ico{background:linear-gradient(135deg,var(--clay),var(--clay-soft))}
.cat:nth-child(9n+3) .cat-ico{background:linear-gradient(135deg,var(--sage),#7aa897)}
.cat:nth-child(9n+4) .cat-ico{background:linear-gradient(135deg,var(--gold),#c7a368)}
.cat:nth-child(9n+5) .cat-ico{background:linear-gradient(135deg,#4a6b8a,var(--navy))}
.cat:nth-child(9n+6) .cat-ico{background:linear-gradient(135deg,#b9805f,var(--clay))}
.cat:nth-child(9n+7) .cat-ico{background:linear-gradient(135deg,#5f8b7a,var(--sage))}
.cat:nth-child(9n+8) .cat-ico{background:linear-gradient(135deg,#a8854d,var(--gold))}
.cat:nth-child(9n+9) .cat-ico{background:linear-gradient(135deg,#3d618a,var(--clay))}

/* ---------- process steps ---------- */
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;position:relative}
.steps::before{content:"";position:absolute;top:34px;left:8%;right:8%;height:2px;background:linear-gradient(90deg,var(--navy),var(--clay),var(--sage),var(--gold));opacity:.35;z-index:0}
.step{position:relative;z-index:1;text-align:center}
.step-num{width:68px;height:68px;margin:0 auto 14px;border-radius:50%;background:var(--paper);border:2px solid var(--stone);display:grid;place-items:center;font-family:var(--serif);font-size:1.7rem;font-weight:700;color:var(--navy);box-shadow:var(--shadow-sm);transition:transform .3s, border-color .3s}
.step:hover .step-num{transform:scale(1.08);border-color:var(--clay)}
.step h4{font-size:.98rem;margin-bottom:6px}
.step p{font-size:.82rem;color:var(--muted)}

/* ---------- why ---------- */
.grid-why{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.why{display:flex;gap:16px;align-items:flex-start;background:var(--paper);border:1px solid var(--stone-2);border-radius:var(--radius);padding:24px;transition:transform .3s,box-shadow .3s}
.why:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.why-ico{flex:0 0 44px;width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:rgba(47,74,107,.08);color:var(--navy)}
.why-ico svg{width:22px;height:22px}
.why h4{font-size:1.05rem;margin-bottom:6px}
.why p{font-size:.87rem;color:var(--muted)}
.why-media{margin:0 0 40px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:21/7}
.why-media img{width:100%;height:100%;object-fit:cover;display:block}

/* ---------- stats band ---------- */
.stats-band{background:linear-gradient(120deg,var(--navy-deep),var(--navy) 60%,#3a5d7e);color:#fff}
.stats-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:54px 24px;text-align:center}
.stat-num{font-family:var(--serif);font-size:2.8rem;font-weight:700;color:var(--clay-soft);display:block;line-height:1}
.stat-label{font-size:.9rem;color:#cdd8e4;margin-top:8px;display:block}

/* ---------- faq ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--paper);border:1px solid var(--stone-2);border-radius:var(--radius-sm);overflow:hidden;transition:border-color .3s}
.faq-item.open{border-color:var(--clay-soft)}
.faq-q{width:100%;text-align:left;background:none;border:0;cursor:pointer;padding:18px 22px;font-family:var(--sans);font-weight:700;font-size:1rem;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq-q .plus{flex:0 0 22px;width:22px;height:22px;position:relative;transition:transform .3s}
.faq-q .plus::before,.faq-q .plus::after{content:"";position:absolute;background:var(--clay);border-radius:2px}
.faq-q .plus::before{top:10px;left:2px;right:2px;height:2px}
.faq-q .plus::after{left:10px;top:2px;bottom:2px;width:2px}
.faq-item.open .plus{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s var(--ease)}
.faq-a-inner{padding:0 22px 20px;color:var(--muted);font-size:.92rem}

/* ---------- contact ---------- */
.contact{background:linear-gradient(180deg,var(--cream),var(--stone-2))}
.contact-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:50px;align-items:start}
.contact-copy h2{font-size:clamp(1.7rem,3vw,2.3rem);margin:14px 0 14px}
.contact-copy p{color:var(--muted);max-width:420px}
.contact-points{list-style:none;margin-top:26px;display:flex;flex-direction:column;gap:16px}
.contact-points li{display:flex;gap:14px;align-items:flex-start}
.contact-points span{flex:0 0 40px;width:40px;height:40px;border-radius:11px;background:rgba(189,123,91,.12);color:var(--clay);display:grid;place-items:center;font-size:1.1rem}
.contact-points strong{display:block;font-size:.9rem}
.contact-points em{font-style:normal;color:var(--muted);font-size:.86rem}
.contact-form{background:var(--paper);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);border:1px solid var(--stone-2);display:flex;flex-direction:column;gap:14px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-form label{display:flex;flex-direction:column;gap:6px;font-size:.85rem;font-weight:600;color:var(--ink-2)}
.contact-form input,.contact-form textarea{border:1px solid var(--stone);border-radius:var(--radius-sm);padding:11px 13px;font-family:var(--sans);font-size:.92rem;background:var(--cream);transition:border .2s,box-shadow .2s;resize:vertical}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--clay);box-shadow:0 0 0 3px rgba(189,123,91,.14)}
.form-note{font-size:.78rem;color:var(--muted-2);text-align:center}

/* ---------- footer ---------- */
.footer{background:var(--navy-deep);color:#c2ccd8;padding:60px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:34px}
.brand-light .brand-text strong{color:#fff}
.brand-light .brand-text em{color:#9fb0c2}
.footer-brand p{font-size:.88rem;color:#9fb0c2;margin-top:16px;max-width:320px}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:16px;letter-spacing:.04em}
.footer-col a,.footer-col span{display:block;font-size:.88rem;color:#aab8c8;margin-bottom:11px;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-lang{display:flex;gap:6px;margin-top:14px}
.footer-lang button{border:1px solid rgba(255,255,255,.2);background:transparent;color:#c2ccd8;font-family:var(--sans);font-weight:700;font-size:.78rem;padding:4px 11px;border-radius:999px;cursor:pointer;transition:.2s}
.footer-lang button.active,.footer-lang button:hover{background:#fff;color:var(--navy-deep);border-color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.8rem;color:#8493a4}

/* ---------- toast ---------- */
.toast{position:fixed;left:50%;bottom:32px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:14px 24px;border-radius:999px;font-size:.92rem;box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:opacity .3s,transform .3s;z-index:100}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:1000px){
  .hero-inner{grid-template-columns:1fr;gap:36px}
  .hero-card{max-width:440px}
  .grid-services .svc{flex-basis:calc(50% - 10px)}
  .grid-cats{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr);gap:26px 14px}
  .steps::before{display:none}
  .grid-why{grid-template-columns:repeat(2,1fr)}
  .stats-inner{grid-template-columns:repeat(2,1fr);gap:30px}
  .contact-grid{grid-template-columns:1fr;gap:34px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav{position:fixed;top:114px;left:0;right:0;background:var(--paper);flex-direction:column;gap:0;padding:8px 24px 18px;border-bottom:1px solid var(--stone);box-shadow:var(--shadow);transform:translateY(-130%);transition:transform .35s var(--ease);z-index:40}
  .nav.open{transform:none}
  .nav a{padding:13px 0;border-bottom:1px solid var(--stone-2);width:100%}
  .burger{display:flex}
  .header-actions .btn-primary{display:none}
  .topbar-left{display:none}
  .grid-services .svc{flex-basis:100%}
  .grid-cats{grid-template-columns:1fr}
  .grid-why{grid-template-columns:1fr}
  .field-row{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:16px}
  .footer-grid{grid-template-columns:1fr}
  .why-media{aspect-ratio:16/10}
  .section{padding:60px 0}
}