:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --text: #16181d;
  --muted: #5b616e;
  --line: #e3e6eb;
  --accent: #1f4fd8;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-alt: #161920;
    --text: #e8eaee;
    --muted: #9aa1ad;
    --line: #2a2e37;
    --accent: #7ea2ff;
    --card: #1b1f27;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg-alt) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { color: var(--text); font-weight: 700; letter-spacing: 0.02em; }
.site-header nav { display: flex; gap: 24px; }
.site-header nav a { color: var(--muted); font-size: 14px; }
.site-header nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { padding: 120px 0 24px; }
.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 28px;
  font-size: clamp(32px, 5.5vw, 52px);
  line-height: 1.35;
  letter-spacing: 0.01em;
}
.lead { max-width: 640px; margin: 0; color: var(--muted); font-size: 17px; }

/* Sections */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.section-lead { margin: 0 0 40px; font-size: 22px; font-weight: 700; line-height: 1.6; }
#about .section-title { margin-bottom: 32px; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; }
.about-text p { margin: 0 0 20px; }
.facts { margin: 0; border-top: 1px solid var(--line); }
.facts div { padding: 14px 0; border-bottom: 1px solid var(--line); }
.facts dt { color: var(--muted); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; }
.facts dd { margin: 2px 0 0; font-weight: 600; }

/* How I build */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.step {
  display: flex;
  gap: 24px;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.step-num { color: var(--accent); font-size: 14px; font-weight: 700; letter-spacing: 0.1em; padding-top: 3px; }
.step h3 { margin: 0 0 8px; font-size: 18px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

/* Works */
.work-featured {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  padding: 32px;
  margin-bottom: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}
.work-featured img { flex-shrink: 0; border-radius: 22px; }
.work-featured h3 { margin: 0 0 10px; font-size: 22px; }
.work-featured p { margin: 0 0 12px; }

.works-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.work-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}
.work-card h3 { margin: 0 0 10px; font-size: 18px; }
.work-card p { margin: 0 0 12px; font-size: 15px; color: var(--muted); }
.work-meta { color: var(--muted); font-size: 12px !important; letter-spacing: 0.06em; margin-bottom: 6px !important; }
.work-tags { font-size: 13px !important; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.work-links { display: flex; gap: 16px; margin-top: auto; font-size: 14px; font-weight: 600; }
.work-links a::after, .contact-links a::after { content: " →"; }

/* Contact */
.contact-links { display: flex; gap: 16px; flex-wrap: wrap; }
.contact-links a {
  padding: 12px 24px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  font-weight: 600;
}
.contact-links a:hover { border-color: var(--accent); text-decoration: none; }

/* Footer */
.site-footer { padding: 32px 0; border-top: 1px solid var(--line); color: var(--muted); }

/* Responsive */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .site-header nav { gap: 14px; }
  .site-header nav a { font-size: 13px; }
  .hero { padding: 72px 0 16px; }
  .section { padding: 64px 0; }
  .section-lead { font-size: 19px; margin-bottom: 28px; }
  .about-grid, .works-grid { grid-template-columns: 1fr; gap: 16px; }
  .about-grid { gap: 32px; }
  .work-featured { flex-direction: column; padding: 24px; gap: 16px; }
  .work-featured img { width: 72px; height: 72px; border-radius: 16px; }
  .step, .work-card { padding: 22px; }
  .step { gap: 16px; }
}

@media (max-width: 420px) {
  .logo { font-size: 14px; }
  .site-header nav { gap: 10px; }
  .site-header nav a { font-size: 12px; }
}

/* Works as page top */
.works-top { padding-top: 72px; }
.page-title {
  margin: 0 0 16px;
  font-size: clamp(28px, 4.5vw, 40px);
  line-height: 1.3;
  letter-spacing: 0.01em;
}
.works-top .lead { margin-bottom: 48px; }

@media (max-width: 768px) {
  .works-top { padding-top: 48px; }
  .works-top .lead { margin-bottom: 32px; }
}