/* YIFA site — industrial B2B */
:root {
  --bg: #0f1419;
  --surface: #1a222c;
  --surface-2: #243040;
  --border: #2e3d4f;
  --text: #e8eef4;
  --muted: #9aafb3;
  --accent: #c45c26;
  --accent-hover: #d96e35;
  --link: #6eb5e0;
  --ok: #3d9a6a;
  --radius: 10px;
  --max: 1080px;
  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.55; font-size: 16px; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
img { max-width: 100%; height: auto; display: block; }

header.site {
  border-bottom: 1px solid var(--border);
  background: rgba(15,20,25,.94);
  backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 40;
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .85rem 0; flex-wrap: wrap; }
.logo { font-weight: 700; font-size: 1.05rem; color: var(--text); letter-spacing: .02em; text-decoration: none; }
.logo span { color: var(--accent); }
.nav-right { display: flex; align-items: center; gap: .9rem; flex-wrap: wrap; }
.nav-links { display: flex; gap: .95rem; flex-wrap: wrap; font-size: .88rem; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.btn {
  display: inline-block; background: var(--accent); color: #fff !important;
  padding: .65rem 1.15rem; border-radius: 6px; font-weight: 600; font-size: .95rem;
  text-decoration: none !important; border: none; cursor: pointer;
}
.btn:hover { background: var(--accent-hover); text-decoration: none !important; }
.btn.ghost {
  background: transparent; border: 1px solid var(--border); color: var(--text) !important;
}
.btn.ghost:hover { border-color: var(--accent); color: #fff !important; }
.btn.sm { padding: .45rem .85rem; font-size: .85rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.1rem; }

.hero { padding: 2.6rem 0 2rem; border-bottom: 1px solid var(--border); }
.eyebrow { color: var(--accent); font-size: .8rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-bottom: .6rem; }
.hero h1 { font-size: clamp(1.7rem, 3.5vw, 2.45rem); line-height: 1.18; margin-bottom: .85rem; max-width: 18ch; }
.hero .lead { color: var(--muted); font-size: 1.05rem; max-width: 62ch; }
.pills { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem; }
.pill {
  font-size: .75rem; font-weight: 600; color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px; padding: .28rem .7rem; background: var(--surface);
}

section.block { padding: 2.4rem 0; border-bottom: 1px solid var(--border); }
section.block h2 { font-size: 1.35rem; margin-bottom: .65rem; }
section.block .intro { color: var(--muted); max-width: 70ch; margin-bottom: 1.25rem; }

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.1rem 1.15rem; height: 100%;
}
.card h3 { font-size: 1.02rem; margin-bottom: .4rem; }
.card p, .card li { color: var(--muted); font-size: .92rem; }
.card ul { padding-left: 1.1rem; margin-top: .4rem; }
.card a.card-link { display: block; text-decoration: none; color: inherit; height: 100%; }
.card a.card-link:hover h3 { color: var(--accent); }

.sku {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column;
}
.sku img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; background: #fff; }
.sku .body { padding: 1rem 1.05rem 1.15rem; flex: 1; display: flex; flex-direction: column; gap: .35rem; }
.sku .model { font-weight: 700; }
.sku .meta { color: var(--muted); font-size: .88rem; }
.sku .actions { margin-top: auto; padding-top: .7rem; display: flex; flex-wrap: wrap; gap: .45rem; }

.steps { display: grid; gap: .75rem; }
.step {
  display: grid; grid-template-columns: 2.4rem 1fr; gap: .85rem; align-items: start;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: .9rem 1rem;
}
.step .n {
  width: 2.2rem; height: 2.2rem; border-radius: 50%; background: var(--surface-2);
  display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--accent); font-size: .9rem;
}
.step h3 { font-size: .98rem; margin-bottom: .2rem; }
.step p { color: var(--muted); font-size: .9rem; }

.why-list { display: grid; gap: .7rem; }
.why-list li {
  list-style: none; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: .85rem 1rem; color: var(--muted); font-size: .95rem;
}
.why-list li strong { color: var(--text); display: block; margin-bottom: .15rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .75rem .9rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); color: var(--text); font-weight: 600; }
td { color: var(--muted); background: var(--surface); }
tr:last-child td { border-bottom: none; }

.intent-grid .card h3 { color: var(--accent); }
.note {
  background: var(--surface-2); border-left: 3px solid var(--accent);
  padding: .85rem 1rem; border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted); font-size: .92rem; margin: 1rem 0;
}
.cta-band {
  background: linear-gradient(135deg, #1a222c 0%, #243040 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.6rem 1.4rem; margin-top: .5rem;
}
.cta-band h2 { margin-bottom: .4rem; }
.cta-band p { color: var(--muted); margin-bottom: .9rem; }

.page-hero { padding: 2.1rem 0 1.4rem; border-bottom: 1px solid var(--border); }
.page-hero h1 { font-size: clamp(1.55rem, 3vw, 2.1rem); margin-bottom: .55rem; }
.page-hero .lead { color: var(--muted); max-width: 70ch; }

footer.site {
  border-top: 1px solid var(--border); padding: 2rem 0 2.4rem; margin-top: 0;
  color: var(--muted); font-size: .88rem;
}
footer.site .cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1.2rem; margin-bottom: 1.4rem; }
footer.site h4 { color: var(--text); font-size: .9rem; margin-bottom: .5rem; }
footer.site a { color: var(--muted); display: block; margin: .25rem 0; text-decoration: none; }
footer.site a:hover { color: var(--text); }
.foot-legal { border-top: 1px solid var(--border); padding-top: 1rem; }

@media (max-width: 720px) {
  .hero h1 { max-width: none; }
  .nav-links { width: 100%; }
}

/* Language toggle */
.lang-switch {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .82rem; color: var(--muted);
  border: 1px solid var(--border); border-radius: 6px;
  padding: .28rem .55rem; white-space: nowrap;
}
.lang-switch a { color: var(--muted); text-decoration: none; font-weight: 600; }
.lang-switch a:hover { color: var(--text); text-decoration: none; }
.lang-switch a.active { color: var(--text); }
.lang-switch .sep { opacity: .45; user-select: none; }

/* Evidence gallery */
.evidence-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(220px,1fr)); gap:1rem; }
.evidence-card { border:1px solid var(--border); border-radius:10px; overflow:hidden; background:var(--card,#fff); }
.evidence-card img { width:100%; aspect-ratio:4/3; object-fit:cover; display:block; background:#f3f3f3; }
.evidence-card .cap { padding:.7rem .85rem; font-size:.86rem; color:var(--muted); }
.evidence-card .cap strong { display:block; color:var(--text); margin-bottom:.2rem; }
.evidence-card.slot { min-height:160px; display:flex; align-items:center; justify-content:center; text-align:center; padding:1rem; color:var(--muted); border-style:dashed; }
.evidence-card.slot strong { color:var(--text); display:block; margin-bottom:.35rem; }
.contact-mail { font-size:.92rem; line-height:1.55; }
.contact-mail .reserved { color:var(--muted); font-size:.85rem; }