/* ==========================================================================
   KeyGo — Design Tokens
   Monotone: black / off-white / gray. No color accent.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --bg:            #0b0b0c;
  --bg-elevated:   #141416;
  --bg-elevated-2: #1b1b1e;
  --border:        #29292d;
  --border-soft:   #1e1e21;
  --text-primary:  #f3f2ef;
  --text-secondary:#a3a2a0;
  --text-tertiary: #616160;
  --accent:        #ffffff;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --max-width: 1120px;
  --gutter: 32px;

  --ease: cubic-bezier(.16,.8,.24,1);
}

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

html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body{
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }

h1,h2,h3{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--text-primary);
}

p{ margin: 0; color: var(--text-secondary); }

.wrap{
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 1px solid var(--text-primary);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11,11,12,0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}

.site-header .wrap{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo{
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo .dot{
  width: 6px; height: 6px;
  background: var(--text-primary);
  border-radius: 50%;
  display: inline-block;
}

.nav{
  display: flex;
  gap: 40px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.nav a{
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
  transition: color .2s var(--ease);
}
.nav a::before{
  content: attr(data-index);
  color: var(--text-tertiary);
  margin-right: 8px;
}
.nav a:hover, .nav a[aria-current="page"]{ color: var(--text-primary); }
.nav a[aria-current="page"]::after{
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 1px;
  background: var(--text-primary);
}

.nav-toggle{
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 40px; height: 40px;
  align-items: center;
  justify-content: center;
}

/* --------------------------------------------------------------------------
   Section scaffolding
   -------------------------------------------------------------------------- */
section{ padding: 120px 0; border-bottom: 1px solid var(--border-soft); }
section:last-of-type{ border-bottom: none; }

.eyebrow{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.eyebrow::before{
  content: '';
  width: 20px; height: 1px;
  background: var(--text-tertiary);
}

.section-head{
  max-width: 640px;
  margin-bottom: 64px;
}
.section-head h2{ font-size: clamp(28px, 3.4vw, 40px); margin-bottom: 16px; }
.section-head p{ font-size: 16px; }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero{
  padding: 96px 0 120px;
  border-bottom: 1px solid var(--border-soft);
}
.hero .wrap{
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero h1{
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.15;
  margin-bottom: 24px;
}
.hero h1 em{
  font-style: normal;
  color: var(--text-tertiary);
}
.hero .lead{
  font-size: 17px;
  max-width: 460px;
  margin-bottom: 40px;
}
.hero-actions{ display: flex; gap: 16px; align-items: center; }

.btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 14px 24px;
  border: 1px solid var(--text-primary);
  color: var(--bg);
  background: var(--text-primary);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.btn:hover{ opacity: 0.82; }
.btn-ghost{
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-ghost:hover{ border-color: var(--text-primary); }

/* Terminal signature element */
.terminal{
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 13px;
}
.terminal-bar{
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.terminal-bar span{
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--border);
}
.terminal-bar .path{
  margin-left: 8px;
  color: var(--text-tertiary);
  font-size: 12px;
}
.terminal-body{
  padding: 20px 20px 24px;
  min-height: 220px;
  color: var(--text-secondary);
  white-space: pre-wrap;
}
.terminal-body .ok{ color: var(--text-primary); }
.terminal-body .muted{ color: var(--text-tertiary); }
.caret{
  display: inline-block;
  width: 7px; height: 15px;
  background: var(--text-primary);
  vertical-align: -2px;
  animation: blink 1s step-end infinite;
}
@keyframes blink{ 50%{ opacity: 0; } }

/* --------------------------------------------------------------------------
   Process (numbered — real sequence: 企画 → 開発 → 運用)
   -------------------------------------------------------------------------- */
.process-list{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
}
.process-item{
  background: var(--bg);
  padding: 40px 32px;
}
.process-index{
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 24px;
}
.process-item h3{ font-size: 20px; margin-bottom: 12px; }
.process-item p{ font-size: 14px; }

/* --------------------------------------------------------------------------
   Feature grid
   -------------------------------------------------------------------------- */
.feature-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
}
.feature-item{
  background: var(--bg);
  padding: 36px;
}
.feature-item .eyebrow{ margin-bottom: 16px; }
.feature-item h3{ font-size: 18px; margin-bottom: 10px; }
.feature-item p{ font-size: 14px; }

/* --------------------------------------------------------------------------
   CTA band
   -------------------------------------------------------------------------- */
.cta-band{
  padding: 100px 0;
  text-align: center;
}
.cta-band h2{
  font-size: clamp(26px, 3.2vw, 38px);
  margin-bottom: 32px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer{ padding: 64px 0 40px; }
.site-footer .wrap{
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-soft);
}
.footer-brand .logo{ margin-bottom: 16px; }
.footer-brand p{ font-size: 13px; max-width: 280px; }
.footer-col h4{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.footer-col a, .footer-col address{
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  font-style: normal;
  margin-bottom: 10px;
}
.footer-col a:hover{ color: var(--text-primary); }
.footer-bottom{
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   Inner page header (company / service / contact)
   -------------------------------------------------------------------------- */
.page-hero{
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-soft);
}
.page-hero .eyebrow{ margin-bottom: 20px; }
.page-hero h1{ font-size: clamp(32px, 4vw, 46px); margin-bottom: 20px; }
.page-hero p{ max-width: 560px; font-size: 16px; }

/* --------------------------------------------------------------------------
   Company page — profile table
   -------------------------------------------------------------------------- */
.profile-table{
  width: 100%;
  border-collapse: collapse;
  border-top: 1px solid var(--border);
}
.profile-table tr{ border-bottom: 1px solid var(--border-soft); }
.profile-table th, .profile-table td{
  text-align: left;
  padding: 24px 0;
  vertical-align: top;
  font-weight: 400;
}
.profile-table th{
  width: 220px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 0.03em;
}
.profile-table td{ font-size: 15px; color: var(--text-primary); }

.map-frame{
  border: 1px solid var(--border);
  filter: grayscale(1) invert(0.92) contrast(0.9);
  width: 100%;
  height: 320px;
}

/* --------------------------------------------------------------------------
   Service page — offering list
   -------------------------------------------------------------------------- */
.offering{
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  padding: 48px 0;
  border-bottom: 1px solid var(--border-soft);
}
.offering:first-of-type{ border-top: 1px solid var(--border-soft); }
.offering-tag{
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
}
.offering h3{ font-size: 22px; margin-bottom: 14px; }
.offering p{ font-size: 15px; max-width: 620px; margin-bottom: 16px; }
.offering ul{ margin: 0; padding: 0; list-style: none; }
.offering li{
  font-size: 14px;
  color: var(--text-secondary);
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}
.offering li::before{
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   Contact page
   -------------------------------------------------------------------------- */
.contact-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
.contact-info h3{ font-size: 18px; margin-bottom: 20px; }
.contact-detail{
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-soft);
}
.contact-detail:last-child{ border-bottom: none; }
.contact-detail .eyebrow{ margin-bottom: 10px; }
.contact-detail a, .contact-detail span{ font-size: 15px; color: var(--text-primary); }

.form-field{ margin-bottom: 24px; }
.form-field label{
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}
.form-field input, .form-field textarea{
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  padding: 14px 16px;
  resize: vertical;
}
.form-field input:focus, .form-field textarea:focus{
  outline: none;
  border-color: var(--text-primary);
}
.form-note{
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: -8px;
  margin-bottom: 28px;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 860px){
  .hero .wrap{ grid-template-columns: 1fr; gap: 48px; }
  .process-list{ grid-template-columns: 1fr; }
  .feature-grid{ grid-template-columns: 1fr; }
  .offering{ grid-template-columns: 1fr; gap: 16px; }
  .contact-grid{ grid-template-columns: 1fr; gap: 48px; }
  .site-footer .wrap{ grid-template-columns: 1fr; gap: 32px; }
  .nav{
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border-soft);
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    display: none;
  }
  .nav.is-open{ display: flex; }
  .nav a{ padding: 16px var(--gutter); }
  .nav a[aria-current="page"]::after{ display: none; }
  .nav-toggle{ display: inline-flex; }
}

@media (max-width: 520px){
  section{ padding: 80px 0; }
  .hero{ padding: 64px 0 80px; }
}