/* ===== Industrial Tools — global/shared styles ===== */
:root {
  --c-brand: #0b4a8e;
  --c-brand-2: #1e88e5;
  --c-ink: #1a2230;
  --c-muted: #5b6675;
  --c-line: #e2e8f0;
  --c-bg: #ffffff;
  --c-bg-soft: #f4f7fb;
  --radius: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.6;
}

a { color: var(--c-brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--c-line);
  background: var(--c-bg);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { font-weight: 700; font-size: 1.15rem; color: var(--c-brand); }
.site-nav a { margin-left: 20px; color: var(--c-muted); font-weight: 500; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-brand-2) 100%);
  color: #fff;
  padding: 64px 0 56px;
}
.hero h1 { font-size: 2.3rem; margin: 0 0 14px; line-height: 1.2; }
.hero .lead { font-size: 1.12rem; max-width: 720px; opacity: 0.95; margin: 0; }

/* Sections */
section { padding: 48px 0; }
.section-soft { background: var(--c-bg-soft); }
h2.section-title { font-size: 1.6rem; margin: 0 0 8px; }
.section-sub { color: var(--c-muted); margin: 0 0 28px; }

/* Tool grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}
.tool-card {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--c-bg);
  display: flex; flex-direction: column;
  transition: box-shadow .2s ease, transform .2s ease;
}
.tool-card:hover { box-shadow: 0 8px 24px rgba(11,74,142,.12); transform: translateY(-2px); }
.tool-card h3 { margin: 0 0 10px; font-size: 1.18rem; }
.tool-card h3 a { color: var(--c-ink); }
.tool-card p { color: var(--c-muted); margin: 0 0 18px; flex: 1; }
.btn {
  display: inline-block;
  background: var(--c-brand);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  align-self: flex-start;
}
.btn:hover { background: var(--c-brand-2); text-decoration: none; color: #fff; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--c-line);
  padding: 30px 0 34px;
  color: var(--c-muted);
  font-size: .92rem;
  background: var(--c-bg-soft);
}
.site-footer .container { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 6px; }
.footer-brand { margin: 0; font-size: 1rem; color: var(--c-ink); font-weight: 600; }
.footer-brand strong { color: var(--c-brand); }
.footer-contact { margin: 2px 0 0; }
.footer-contact a { color: var(--c-brand-2); font-weight: 600; }
.footer-contact .sep { margin: 0 8px; color: var(--c-line); }
.footer-meta { margin: 6px 0 0; font-size: .83rem; color: var(--c-muted); }

/* CTA (tool pages) */
.cta-section { background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-brand-2) 100%); color: #fff; padding: 44px 0; }
.cta-section h2 { margin: 0 0 8px; font-size: 1.6rem; }
.cta-sub { margin: 0 0 12px; opacity: .95; }
.cta-list { list-style: none; padding: 0; margin: 0 0 22px; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.cta-list li { position: relative; padding-left: 22px; font-size: .98rem; }
.cta-list li::before { content: "\2713"; position: absolute; left: 0; font-weight: 700; }
.btn-primary { background: #fff; color: var(--c-brand); border: 0; }
.btn-primary:hover { background: #eaf2fb; color: var(--c-brand); text-decoration: none; }

/* Forms (contact + generic) */
.form-card { max-width: 560px; margin: 0 auto; }
.form-card .field { margin-bottom: 16px; }
.form-card label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 6px; color: var(--c-ink); }
.form-card input, .form-card textarea, .form-card select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--c-line); border-radius: 8px;
  font: inherit; color: var(--c-ink); background: #fff;
}
.form-card input:focus, .form-card textarea:focus { outline: none; border-color: var(--c-brand-2); box-shadow: 0 0 0 3px rgba(30,136,229,.15); }
.form-card textarea { min-height: 130px; resize: vertical; }
.form-card .btn { margin-top: 4px; }
.form-success { background: #e8f5e9; border: 1px solid #a5d6a7; color: #1b5e20; padding: 14px 16px; border-radius: 8px; margin: 0 0 18px; }
.form-support { background: var(--c-bg-soft); border: 1px solid var(--c-line); border-radius: var(--radius); padding: 18px 22px; margin: 24px auto 0; max-width: 760px; }
.form-support h2 { margin: 0 0 10px; font-size: 1.25rem; }
.form-support ul { margin: 0; padding-left: 18px; }
.form-support li { margin-bottom: 4px; }

/* Breadcrumb */
.breadcrumb { font-size: .9rem; color: var(--c-muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--c-brand-2); }

/* Generic page intro */
.page-intro { padding: 40px 0 8px; }
.page-intro h1 { font-size: 2rem; margin: 0 0 10px; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.7rem; }
  .hero { padding: 44px 0 40px; }
}

/* Tables (guides + comparisons) */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-line); border-radius: var(--radius); margin: 18px 0; }
table.doc-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
table.doc-table th, table.doc-table td { padding: 11px 14px; border-bottom: 1px solid var(--c-line); text-align: left; vertical-align: top; }
table.doc-table th { background: var(--c-bg-soft); font-weight: 700; color: var(--c-ink); }
table.doc-table tr:last-child td { border-bottom: 0; }
table.doc-table td strong { color: var(--c-brand); }

/* Callout / note box */
.callout { border-left: 4px solid var(--c-brand-2); background: var(--c-bg-soft); padding: 14px 18px; border-radius: 8px; margin: 18px 0; }
.callout strong { color: var(--c-brand); }

/* "When to choose" split cards */
.choose-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin-top: 14px; }
.choose-card { border: 1px solid var(--c-line); border-radius: var(--radius); padding: 18px 20px; background: var(--c-bg); }
.choose-card h3 { margin: 0 0 10px; font-size: 1.05rem; color: var(--c-brand); }

/* Symptom checklist (defect analyzer) */
.check-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px 18px; margin: 6px 0 16px; }
.check-list label { display: flex; align-items: flex-start; gap: 8px; font-weight: 500; font-size: .92rem; color: var(--c-ink); cursor: pointer; }
.check-list input { margin-top: 4px; }

/* Weight sliders (alloy selector) */
.weight-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px 22px; margin: 6px 0 16px; }
.weight-item label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
.weight-item input[type=range] { width: 100%; }
.weight-item .val { font-size: .82rem; color: var(--c-muted); }

/* Result ranking list */
.rank-list { list-style: none; padding: 0; margin: 0; }
.rank-list li { border: 1px solid var(--c-line); border-left: 4px solid var(--c-brand); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 10px; background: var(--c-bg); }
.rank-list li .score { font-weight: 700; color: var(--c-brand); }
.defect-card { border: 1px solid var(--c-line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 16px; background: var(--c-bg); }
.defect-card h3 { margin: 0 0 8px; color: var(--c-brand); }
.defect-card h4 { margin: 12px 0 4px; font-size: .92rem; text-transform: uppercase; letter-spacing: .03em; color: var(--c-muted); }
.defect-card ul { margin: 0; padding-left: 18px; }