/* 869合同会社 — Corporate mockup design system */

:root {
  --bg: #f6f4f0;
  --bg-elevated: #fdfcfa;
  --text: #1a1918;
  --text-muted: #5c5854;
  --border: #e2ddd6;
  --navy: #1a2433;
  --gold: #b8956b;
  --gold-hover: #a6845a;
  --accent: var(--gold);
  --division-accent: #b8956b;
  --division-accent-soft: #e8dfd0;
  --font-serif: "Noto Serif JP", "Cormorant Garamond", Georgia, serif;
  --font-sans: "Noto Sans JP", system-ui, sans-serif;
  --font-display: "Cormorant Garamond", "Noto Serif JP", serif;
  --max-width: 1280px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-division="kogei"] {
  --division-accent: #8b6914;
  --division-accent-soft: #e8dfd0;
}

[data-division="chigyo"] {
  --division-accent: #3d4f5f;
  --division-accent-soft: #e4e8ec;
}

[data-division="ryutsu"] {
  --division-accent: #4a5d52;
  --division-accent-soft: #e5ebe7;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

a:hover { color: var(--division-accent); }

:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Layout */
.container {
  width: min(100% - 10vw, var(--max-width));
  margin-inline: auto;
}

.section {
  padding-block: clamp(4rem, 10vw, 8rem);
}

.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background 0.4s var(--ease), border-color 0.4s;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(246, 244, 240, 0.92);
  backdrop-filter: blur(12px);
  border-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 10vw, var(--max-width));
  margin-inline: auto;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--navy);
}

.logo span {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  display: block;
  letter-spacing: 0.2em;
  font-weight: 300;
  color: var(--text-muted);
  margin-top: 2px;
}

.nav-desktop {
  display: none;
  gap: 2rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-desktop a {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  position: relative;
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--division-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.nav-desktop a:hover::after,
.nav-desktop a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-cta {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 0.65rem 1.25rem;
  border: 1px solid var(--gold);
  color: var(--navy);
  transition: background 0.3s, color 0.3s;
}

.nav-cta:hover {
  background: var(--navy);
  color: var(--bg);
  border-color: var(--navy);
}

.menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--navy);
}

.menu-toggle svg { display: block; }

.nav-mobile {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s, visibility 0.4s;
}

.nav-mobile.is-open {
  opacity: 1;
  visibility: visible;
}

.nav-mobile a {
  font-family: var(--font-display);
  font-size: 1.75rem;
}

@media (min-width: 900px) {
  .nav-desktop { display: flex; }
  .menu-toggle { display: none; }
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  padding-block: calc(var(--header-h) + 4rem) 6rem;
  position: relative;
}

.hero__label {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  animation: fadeUp 0.8s var(--ease) 0.1s both;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin: 0 0 1.5rem;
  max-width: 14ch;
  animation: fadeUp 0.8s var(--ease) 0.2s both;
}

.hero__lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  max-width: 36em;
  color: var(--text-muted);
  margin: 0 0 2.5rem;
  animation: fadeUp 0.8s var(--ease) 0.35s both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  animation: fadeUp 0.8s var(--ease) 0.5s both;
}

.hero__line {
  position: absolute;
  top: var(--header-h);
  left: 5vw;
  width: 1px;
  height: 40vh;
  background: linear-gradient(to bottom, var(--border), transparent);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Typography blocks */
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--division-accent);
  margin-bottom: 1rem;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 1rem;
}

h3 {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
}

.lead {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 40em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  padding: 0.9rem 1.75rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.35s var(--ease);
}

.btn--outline {
  border-color: var(--gold);
  color: var(--navy);
  background: transparent;
}

.btn--outline:hover {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--bg);
}

.btn--primary {
  background: var(--navy);
  color: var(--bg);
  border-color: var(--navy);
}

.btn--primary:hover {
  background: #0f1620;
}

.btn-arrow::after {
  content: "→";
  transition: transform 0.3s var(--ease);
}

.btn:hover .btn-arrow::after,
.btn.btn-arrow:hover::after {
  transform: translateX(4px);
}

/* Division grid */
.division-grid {
  display: grid;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

@media (min-width: 768px) {
  .division-grid { grid-template-columns: repeat(3, 1fr); }
}

.division-card {
  background: var(--bg-elevated);
  padding: clamp(2rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  min-height: 320px;
  position: relative;
  overflow: hidden;
  transition: background 0.4s var(--ease);
}

.division-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--card-accent, var(--gold));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.5s var(--ease);
}

.division-card:hover::before { transform: scaleY(1); }

.division-card:hover { background: #fff; }

.division-card[data-accent="kogei"] { --card-accent: #8b6914; }
.division-card[data-accent="chigyo"] { --card-accent: #3d4f5f; }
.division-card[data-accent="ryutsu"] { --card-accent: #4a5d52; }

.division-card__num {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--border);
  line-height: 1;
  margin-bottom: 1rem;
}

.division-card__title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.division-card__en {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.division-card p {
  flex: 1;
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

.division-card__link {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  align-self: flex-start;
}

/* Split layout */
.split {
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 900px) {
  .split { grid-template-columns: 1fr 1fr; gap: 5rem; }
}

.visual-placeholder {
  aspect-ratio: 4 / 5;
  background:
    linear-gradient(145deg, var(--division-accent-soft) 0%, var(--bg) 60%),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.02) 2px,
      rgba(0, 0, 0, 0.02) 4px
    );
  position: relative;
}

.visual-placeholder::after {
  content: "イメージ（プレースホルダー）";
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

/* Works */
.works-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 640px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .works-grid { grid-template-columns: repeat(3, 1fr); }
}

.work-card {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  transition: border-color 0.3s;
}

.work-card:hover { border-color: var(--division-accent); }

.work-card__img {
  aspect-ratio: 16 / 10;
  background: var(--division-accent-soft);
}

.work-card__body { padding: 1.5rem; }

.work-card__tag {
  font-family: var(--font-sans);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: var(--division-accent);
  margin-bottom: 0.5rem;
}

.work-card h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.work-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
}

/* Page hero (inner) */
.page-hero {
  padding-top: calc(var(--header-h) + 4rem);
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 1rem;
}

.page-hero .lead { margin: 0; }

/* Division accent bar */
.division-page .page-hero {
  border-left: 4px solid var(--division-accent);
  padding-left: clamp(1.5rem, 4vw, 3rem);
  margin-left: 5vw;
  max-width: calc(var(--max-width) + 5vw);
}

/* Services list */
.service-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  border-top: 1px solid var(--border);
}

.service-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  gap: 0.25rem;
}

@media (min-width: 640px) {
  .service-list li {
    grid-template-columns: 200px 1fr;
    gap: 2rem;
  }
}

.service-list strong {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  font-weight: 500;
}

/* Form */
.form {
  max-width: 560px;
  margin-top: 2rem;
}

.form-group { margin-bottom: 1.5rem; }

.form label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  transition: border-color 0.3s;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--navy);
}

.form textarea { min-height: 140px; resize: vertical; }

.form-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 28em;
}

.footer-nav h4 {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  font-weight: 500;
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.footer-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav li { margin-bottom: 0.5rem; }

.footer-nav a {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Quote block */
.quote-block {
  border-left: 2px solid var(--gold);
  padding-left: 1.5rem;
  margin: 3rem 0;
  font-size: 1.125rem;
  font-style: italic;
  color: var(--text-muted);
}

/* Stats row */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border);
}

.stat__value {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--division-accent);
  display: block;
}

.stat__label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}