/* ── リセット & 変数 ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:      #0a0a0a;
  --bg2:     #111111;
  --text:    #f0f0f0;
  --muted:   #777;
  --border:  #252525;
  --white:   #ffffff;
  --font:    'Space Grotesk', system-ui, sans-serif;
  --mono:    'Space Mono', 'Courier New', monospace;
  --ease:    cubic-bezier(0.16, 1, 0.3, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--white); color: var(--bg); }

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

/* ── ナビゲーション ─────────────────────────────────── */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.3s var(--ease), border-bottom 0.3s;
}

#header.scrolled {
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
  transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.7; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--white); }

.nav-cta {
  color: var(--white) !important;
  border: 1px solid var(--border);
  padding: 0.5rem 1.25rem;
  transition: background 0.2s, color 0.2s !important;
}
.nav-cta:hover { background: var(--white); color: var(--bg) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child  { transform: translateY(-6px) rotate(-45deg); }

/* ── ヒーロー ────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  opacity: 0.4;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 8rem 2rem 6rem;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--mono);
  font-size: clamp(5rem, 16vw, 14rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--white);
}

.hero-dot {
  color: var(--white);
  animation: blink 1.2s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-sub {
  margin-top: 2.5rem;
  font-size: clamp(1rem, 2.5vw, 1.375rem);
  font-weight: 300;
  color: var(--muted);
  line-height: 1.8;
  border-left: 2px solid var(--border);
  padding-left: 1.25rem;
}

.hero-scroll {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 4rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  transition: color 0.2s;
  animation: float 2.5s ease-in-out infinite;
}
.hero-scroll:hover { color: var(--white); }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ── セクション共通 ──────────────────────────────────── */
.section { padding: 8rem 0; }
.section--dark { background: var(--bg2); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 4rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.section-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ── カード（事業紹介） ──────────────────────────────── */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--border);
}

.card {
  padding: 2.5rem;
  border-right: 1px solid var(--border);
  transition: background 0.3s var(--ease);
}
.card:last-child { border-right: none; }
.card:hover { background: var(--bg2); }

.card-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.card-text {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.8;
}

/* ── 会社概要 ─────────────────────────────────────────── */
.company-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

table { width: 100%; border-collapse: collapse; }

th, td {
  padding: 1rem 0;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  text-align: left;
}

th {
  width: 8rem;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
}

td { color: var(--text); }

.company-text p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.9;
}
.company-text p + p { margin-top: 1.25rem; }

/* ── お問い合わせ ─────────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-info p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.9;
}

.form { display: flex; flex-direction: column; gap: 1.25rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-field { display: flex; flex-direction: column; gap: 0.5rem; }

label {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-transform: uppercase;
}

.req { color: var(--white); }

input, textarea {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.875rem 1rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
  resize: vertical;
}

input:focus, textarea:focus {
  border-color: var(--white);
  box-shadow: 0 0 0 1px var(--white);
}

input::placeholder, textarea::placeholder { color: #444; }

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.5rem;
}

.form-notice {
  font-size: 0.75rem;
  color: var(--muted);
}

.btn-submit {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--white);
  color: var(--bg);
  border: none;
  padding: 0.875rem 2rem;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
}
.btn-submit:hover { background: #e0e0e0; }
.btn-submit:active { transform: scale(0.98); }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-icon { font-size: 1.1rem; transition: transform 0.2s; }
.btn-submit:not(:disabled):hover .btn-icon { transform: translateX(4px); }

.form-status {
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  display: none;
}
.form-status.success {
  display: block;
  border: 1px solid #3a3;
  color: #7d7;
}
.form-status.error {
  display: block;
  border: 1px solid #a33;
  color: #f88;
}

/* ── フッター ─────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--white);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── スクロールリビール ───────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }

/* ── レスポンシブ ─────────────────────────────────────── */
@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr; }
  .card { border-right: none; border-bottom: 1px solid var(--border); }
  .card:last-child { border-bottom: none; }

  .company-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .contact-layout { grid-template-columns: 1fr; gap: 2rem; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.97);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem;
    gap: 1.25rem;
    align-items: flex-start;
  }
  .nav-links.open { display: flex; }
  .nav-cta { border: none; padding: 0; }
  .nav-toggle { display: flex; }

  .hero-inner { padding: 7rem 1.25rem 4rem; }
  .section { padding: 5rem 0; }
  .container { padding: 0 1.25rem; }

  .form-footer { flex-direction: column; align-items: flex-start; }
  .btn-submit { width: 100%; justify-content: center; }

  .footer-inner { flex-direction: column; text-align: center; }
}