:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f4f1;
  --color-text: #1c1c1a;
  --color-text-muted: #6b6a66;
  --color-accent: #2f3e46;
  --color-line: #dedcd6;
  --font-serif: 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.9;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  margin: 0;
}

img { max-width: 100%; display: block; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-line);
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: 0.08em;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.logo-sub {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

.site-nav {
  display: flex;
  gap: 36px;
}

.site-nav a {
  font-size: 14px;
  letter-spacing: 0.04em;
  position: relative;
  padding-bottom: 4px;
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0%;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}

.site-nav a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 1px;
  background: var(--color-text);
  display: block;
}

/* Hero */
.hero {
  padding: 140px 24px 120px;
  border-bottom: 1px solid var(--color-line);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-eyebrow {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 42px;
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 640px;
}

.hero-lead {
  max-width: 520px;
  color: var(--color-text-muted);
  font-size: 15px;
  margin-bottom: 40px;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 14px;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-accent);
  transition: background 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
}

/* Sections */
.section {
  padding: 100px 24px;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-eyebrow {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.section-title {
  font-size: 28px;
  margin-bottom: 48px;
}

.philosophy p {
  max-width: 680px;
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 56px;
}

.company-table-wrap {
  border-top: 1px solid var(--color-line);
}

.company-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.company-table th, .company-table td {
  text-align: left;
  padding: 18px 16px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.company-table th {
  width: 160px;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* Services */
.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  margin-bottom: 72px;
}

.service-card {
  background: #fff;
  padding: 36px;
}

.service-card h3 {
  font-size: 17px;
  margin-bottom: 14px;
}

.service-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 0;
}

.works-heading {
  font-size: 20px;
  margin-bottom: 8px;
}

.works-note {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.works-cta {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-line);
}

.works-cta p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 0 0 20px;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

/* Works page */
.page-hero {
  padding: 100px 24px 60px;
  border-bottom: 1px solid var(--color-line);
}

.page-hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-hero-lead {
  max-width: 560px;
  color: var(--color-text-muted);
  font-size: 15px;
  margin-top: 20px;
}

.works-filter-note {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 40px;
}

.works-grid-full {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px 32px;
}

.work-card-full .work-thumb {
  aspect-ratio: 4 / 3;
}

.work-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  border: 1px solid var(--color-line);
  padding: 3px 10px;
  margin-bottom: 10px;
}

.work-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 8px 0 0;
}

.work-thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #e4e2db, #cfccc2);
  margin-bottom: 16px;
}

.work-title {
  font-size: 15px;
  margin: 0 0 4px;
}

.work-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  margin: 0;
}

/* Contact */
.contact-lead {
  max-width: 560px;
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 40px;
}

.contact-form-wrap {
  border: 1px solid var(--color-line);
  margin-bottom: 40px;
}

.contact-form-wrap iframe {
  display: block;
}

.contact-alt p {
  font-size: 14px;
  margin: 6px 0;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 48px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 18px;
  margin-bottom: 12px;
}

.footer-address, .footer-copy {
  font-size: 12px;
  color: var(--color-text-muted);
  margin: 4px 0;
}

/* Responsive */
@media (max-width: 860px) {
  .service-grid { grid-template-columns: 1fr; }
  .works-grid { grid-template-columns: 1fr 1fr; }
  .works-grid-full { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .site-nav.open {
    max-height: 300px;
  }

  .site-nav a {
    padding: 16px 24px;
    border-top: 1px solid var(--color-line);
  }

  .hero { padding: 100px 20px 80px; }
  .hero h1 { font-size: 30px; }
  .section { padding: 64px 20px; }
  .works-grid { grid-template-columns: 1fr; }
  .works-grid-full { grid-template-columns: 1fr; }
  .company-table th { width: 110px; }
  .page-hero { padding: 80px 20px 48px; }
}