/* Clean one-page layout */
:root {
  --text: #111;
  --muted: #555;
  --line: #d6d6d6;
  --bg: #fff;
  --soft: #f6f6f6;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 26px 24px;
}

.site-header {
  background: var(--soft);
  border-bottom: 1px solid var(--line);
}

.site-header .container {
  padding-top: 34px;
  padding-bottom: 30px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--muted);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 600;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(2.0rem, 3.2vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  max-width: 70ch;
  font-size: 1.05rem;
}

main.container {
  padding-top: 26px;
}

.article {
  padding: 8px 0 10px;
}

h2 {
  margin: 24px 0 10px;
  font-size: 1.55rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h3 {
  margin: 22px 0 10px;
  font-size: 1.15rem;
  line-height: 1.25;
}

p {
  margin: 0 0 14px;
}

ul {
  margin: 0 0 16px 22px;
}

.gallery {
  padding: 6px 0 6px;
}

.part-card {
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 18px;
  margin: 18px 0;
  background: #fff;
}

.part-title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: none;
  color: #222;
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* Part number block */
.part-meta {
  margin: 0 0 12px;
  padding-top: 2px;
}

.part-meta-label {
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 6px;
}

.part-nos {
  list-style: none;
  margin: 0;
  padding: 0;
}

.part-nos li {
  margin: 4px 0;
  color: #222;
  font-size: 0.98rem;
  line-height: 1.35;
}

.part-figure {
  margin: 0;
}

.part-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.footer {
  margin-top: 28px;
  padding: 20px 0 36px;
  border-top: 1px solid var(--line);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  margin: 8px 0;
  color: var(--text);
}

/* Small footer note for keywords (visible, but unobtrusive) */
.seo-footnote {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.seo-footnote details {
  margin: 0;
}

.seo-footnote summary {
  cursor: pointer;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.02em;
  list-style: none;
}

.seo-footnote summary::-webkit-details-marker {
  display: none;
}

.seo-footnote .kw-text {
  margin: 10px 0 0;
  font-size: 0.72rem;
  line-height: 1.45;
  color: #777;
  overflow-wrap: anywhere;
  word-break: break-word;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .container { padding: 22px 16px; }
  h1 { font-size: 2.05rem; }
}