/* ═══════════════════════════════════════════════════
   ONENIZE — Monochrome Design System
═══════════════════════════════════════════════════ */

/* ── Reset & Variables ── */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

:root {
  --bg:        #090909;
  --surface:   #121212;
  --surface2:  #1b1b1b;
  --border:    #2d2d2d;
  --border2:   #3a3a3a;
  --accent:    #e8e8e8;
  --accent2:   #8a8a8a;
  --accent-d:  rgba(232,232,232,.07);
  --text:      #ebebeb;
  --muted:     #a0a0a0;
  --muted2:    #585858;
  --sales:     #e8e8e8;
  --it:        #b4b4b4;
  --cs:        #808080;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter','Noto Sans JP',sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Nav ── */
nav {
  position: fixed; inset: 0 0 auto; z-index: 200;
  padding: 1rem 3rem;
  display: flex; justify-content: space-between; align-items: center;
  background: rgba(9,9,9,.85);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  display: flex; align-items: center; gap: .55rem;
  font-size: 1rem; font-weight: 800; letter-spacing: .12em;
  color: var(--text);
}
.nav-logo .logo-mark {
  width: 7px; height: 7px;
  background: var(--text); flex-shrink: 0;
}
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
.nav-links a {
  color: var(--muted); font-size: .72rem;
  letter-spacing: .12em; text-transform: uppercase;
  transition: color .2s; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -3px;
  width: 0; height: 1px; background: var(--text);
  transition: width .25s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--text); }
.nav-links a.active::after { width: 100%; }
.nav-cta {
  display: inline-block;
  background: var(--text); color: var(--bg) !important;
  padding: .45rem 1.3rem; border-radius: 3px;
  font-size: .7rem !important; font-weight: 700;
  letter-spacing: .1em !important;
  transition: background .2s, box-shadow .2s !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover {
  background: #fff !important;
  box-shadow: 0 2px 12px rgba(255,255,255,.12) !important;
  color: #000 !important;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .75rem 1.75rem; border-radius: 3px;
  font-size: .85rem; font-weight: 600; letter-spacing: .05em;
  transition: all .22s; cursor: pointer; border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--text); color: #0a0a0a;
}
.btn-primary:hover {
  background: #fff;
  box-shadow: 0 4px 20px rgba(255,255,255,.1);
  transform: translateY(-1px);
}
.btn-ghost {
  border: 1px solid var(--border2); color: var(--muted);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--text); color: var(--text);
  transform: translateY(-1px);
}
.btn-outline {
  border: 1px solid var(--accent2); color: var(--accent2);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--text); color: var(--text);
  transform: translateY(-1px);
}
.btn-sm { padding: .5rem 1.2rem; font-size: .78rem; }
.btn-lg { padding: .85rem 2rem; font-size: .9rem; }

/* ── Section Helpers ── */
.section-inner    { max-width: 1100px; margin: 0 auto; padding: 6rem 2rem; }
.section-inner-sm { max-width: 780px;  margin: 0 auto; padding: 6rem 2rem; }

.section-label {
  display: inline-block;
  font-size: .62rem; letter-spacing: .28em; text-transform: uppercase;
  color: var(--accent2); margin-bottom: .65rem;
}
.section-title {
  font-size: clamp(1.75rem,4vw,2.5rem); font-weight: 700;
  letter-spacing: -.025em; line-height: 1.2; margin-bottom: 1rem;
}
.section-desc {
  font-size: .95rem; color: var(--text); line-height: 1.9;
  max-width: 560px; margin-bottom: 3rem;
}
.divider {
  height: 1px;
  background: var(--border);
}

/* ── Page Hero (subpages) ── */
.page-hero {
  position: relative; min-height: 320px;
  display: flex; flex-direction: column;
  justify-content: flex-end; padding: 0 2rem 4rem;
  overflow: hidden; margin-top: 60px;
}
.page-hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 20% 70%, rgba(255,255,255,.03) 0%, transparent 60%);
}
.page-hero-bg::before {
  content: '';
  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;
  opacity: .35;
}
.page-hero-inner { max-width: 1100px; width: 100%; margin: 0 auto; }
.breadcrumb {
  display: flex; align-items: center; gap: .5rem;
  font-size: .68rem; color: var(--muted); letter-spacing: .1em;
  margin-bottom: 1.5rem;
}
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span:last-child { color: var(--accent2); }
.page-hero-title {
  font-size: clamp(2.5rem,6vw,4rem); font-weight: 800;
  letter-spacing: -.04em; line-height: 1;
  color: var(--text);
}
.page-hero-sub {
  margin-top: .85rem; font-size: .9rem; color: var(--text);
  font-weight: 300; letter-spacing: .04em;
}

/* ── Cards ── */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 6px; padding: 2rem;
  transition: border-color .25s, box-shadow .25s;
}
.card:hover {
  border-color: var(--border2);
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
}

/* Feature cards */
.feature-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.feature-card {
  background: var(--surface); padding: 2.25rem 2rem;
  position: relative;
  transition: background .25s;
}
.feature-card:hover { background: var(--surface2); }
.feature-icon {
  width: 44px; height: 44px; border-radius: 4px;
  background: var(--surface2); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: 1.25rem;
}
.feature-title { font-size: 1rem; font-weight: 700; margin-bottom: .5rem; letter-spacing: -.01em; }
.feature-desc  { font-size: .83rem; color: var(--text); line-height: 1.85; }
.feature-list  { list-style: none; margin-top: 1rem; }
.feature-list li {
  font-size: .78rem; color: var(--text); padding: .28rem 0;
  display: flex; align-items: center; gap: .5rem;
}
.feature-list li::before {
  content: '—'; color: var(--muted2); font-size: .7rem; flex-shrink: 0;
}

/* Service cards */
.service-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.service-card {
  background: var(--surface); padding: 2.25rem 2rem;
  position: relative; overflow: hidden;
  transition: background .25s;
  display: flex; flex-direction: column;
}
.service-card:hover { background: var(--surface2); }

.service-num {
  font-size: 2.8rem; font-weight: 900; letter-spacing: -.06em; line-height: 1;
  color: var(--border2); margin-bottom: 1.25rem;
  font-family: 'Inter', sans-serif;
}
.service-label {
  font-size: .62rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--text); margin-bottom: .4rem; font-weight: 600;
}
.service-title { font-size: 1rem; font-weight: 700; letter-spacing: -.01em; margin-bottom: .75rem; }
.service-desc  { font-size: .83rem; color: var(--text); line-height: 1.9; flex: 1; }
.service-link  {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .78rem; color: var(--text); margin-top: 1.5rem;
  border-bottom: 1px solid var(--border2); padding-bottom: .2rem;
  transition: border-color .2s, gap .2s;
  width: fit-content;
}
.service-link:hover { border-color: var(--text); gap: .6rem; }

/* Tags/badges */
.badge {
  display: inline-block; font-size: .6rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  padding: .22rem .75rem; border-radius: 2px;
  background: var(--surface2); border: 1px solid var(--border2);
  color: var(--accent2); white-space: nowrap;
}
.tag {
  font-size: .62rem; padding: .2rem .65rem; border-radius: 2px;
  background: var(--surface2); border: 1px solid var(--border);
  color: var(--muted);
}

/* ── Info Table ── */
.info-table { width: 100%; border-collapse: collapse; }
.info-table tr { border-bottom: 1px solid var(--border); }
.info-table tr:last-child { border-bottom: none; }
.info-table th {
  width: 180px; padding: 1.1rem 1.5rem;
  font-size: .68rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); font-weight: 600; text-align: left;
  vertical-align: top;
}
.info-table td {
  padding: 1.1rem 1.5rem;
  font-size: .88rem; color: var(--text); line-height: 1.75;
}

/* ── Timeline ── */
.timeline { display: flex; flex-direction: column; }
.timeline-item { display: flex; gap: 1.5rem; }
.timeline-line { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; }
.timeline-dot {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--surface2); border: 1px solid var(--border2);
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem; font-weight: 700; color: var(--accent2);
  flex-shrink: 0; position: relative; z-index: 1;
}
.timeline-connector { flex: 1; width: 1px; background: var(--border); min-height: 40px; }
.timeline-content { padding-bottom: 2.5rem; padding-top: .4rem; }
.timeline-step  { font-size: .6rem; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); margin-bottom: .3rem; }
.timeline-title { font-size: .95rem; font-weight: 700; margin-bottom: .4rem; }
.timeline-desc  { font-size: .83rem; color: var(--text); line-height: 1.8; }

/* ── Contact Form ── */
.form-group { margin-bottom: 1.5rem; }
.form-label {
  display: block; font-size: .68rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: .5rem; font-weight: 600;
}
.form-required {
  display: inline-block; font-size: .55rem; font-weight: 700;
  background: rgba(235,235,235,.08); border: 1px solid rgba(235,235,235,.15);
  color: var(--accent2); padding: .1rem .4rem; border-radius: 2px;
  letter-spacing: .08em; margin-left: .4rem; vertical-align: middle;
}
.form-required.req {
  background: rgba(235,235,235,.12); border-color: rgba(235,235,235,.25);
  color: var(--text);
}
.form-input, .form-select, .form-textarea {
  width: 100%; padding: .85rem 1rem;
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: 3px; color: var(--text);
  font-family: inherit; font-size: .875rem;
  transition: border-color .2s, box-shadow .2s; outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent2);
  box-shadow: 0 0 0 2px rgba(232,232,232,.07);
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--muted2); }
.form-textarea { min-height: 140px; resize: vertical; }
.form-select {
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235a5a5a' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 1rem center;
  padding-right: 2.5rem;
}
.form-note { font-size: .78rem; color: var(--muted); line-height: 1.7; margin-top: .4rem; }

/* ── CTA Banner ── */
.cta-banner {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 6px; padding: 4.5rem 3rem;
  text-align: center; position: relative; overflow: hidden;
}
.cta-banner::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: .2;
}
.cta-banner-content { position: relative; }
.cta-banner-label   { font-size: .62rem; letter-spacing: .28em; text-transform: uppercase; color: var(--accent2); margin-bottom: .75rem; }
.cta-banner-title   { font-size: clamp(1.5rem,3.5vw,2.1rem); font-weight: 700; letter-spacing: -.025em; margin-bottom: 1rem; }
.cta-banner-desc    { font-size: .875rem; color: var(--text); max-width: 480px; margin: 0 auto 2rem; line-height: 1.9; }
.cta-banner-btns    { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* ── Stat strip ── */
.stat-strip {
  display: grid; grid-template-columns: repeat(3,1fr);
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.stat-item {
  background: var(--surface); padding: 2rem;
  display: flex; flex-direction: column; gap: .35rem;
  transition: background .25s;
}
.stat-item:hover { background: var(--surface2); }
.stat-num   { font-size: clamp(2rem,5vw,2.8rem); font-weight: 900; letter-spacing: -.04em; line-height: 1; color: var(--text); }
.stat-label { font-size: .72rem; color: var(--muted); }

/* ── Footer ── */
footer { border-top: 1px solid var(--border); padding: 4rem 2rem 2rem; }
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer-top {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem; margin-bottom: 3rem;
}
.footer-logo {
  font-size: 1rem; font-weight: 800; letter-spacing: .12em;
  color: var(--text); margin-bottom: .75rem;
}
.footer-tagline        { font-size: .8rem; color: var(--muted); margin-bottom: 1.25rem; line-height: 1.7; }
.footer-contact-item   { font-size: .78rem; color: var(--muted); margin-bottom: .35rem; line-height: 1.6; }
.footer-nav-title      { font-size: .62rem; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); margin-bottom: 1rem; font-weight: 600; }
.footer-nav-links      { list-style: none; display: flex; flex-direction: column; gap: .6rem; }
.footer-nav-links a    { font-size: .83rem; color: var(--muted); transition: color .2s; }
.footer-nav-links a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 1.75rem;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem;
}
.footer-copy  { font-size: .7rem; color: var(--muted); letter-spacing: .05em; }
.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a { font-size: .7rem; color: var(--muted); transition: color .2s; }
.footer-legal a:hover { color: var(--text); }

/* ── Animations ── */
@keyframes fadeUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:none} }
@keyframes wave   { 0%,100%{transform:scaleY(1)} 50%{transform:scaleY(.22)} }
@keyframes ticker { from{transform:translateX(0)} to{transform:translateX(-50%)} }
@keyframes pulse  { 0%,100%{opacity:.5} 50%{opacity:.8} }

.reveal {
  opacity: 0; transform: translateY(16px);
  transition: opacity .65s ease, transform .65s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .feature-grid,
  .service-grid { grid-template-columns: 1fr; }
  .footer-top   { grid-template-columns: 1fr 1fr; }
  .stat-strip   { grid-template-columns: 1fr; }
}
/* ── Hamburger ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 201;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: transform .25s ease, opacity .25s ease;
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; }
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    position: fixed;
    top: 57px; left: 0; right: 0;
    background: rgba(9,9,9,.97);
    backdrop-filter: blur(24px);
    flex-direction: column;
    gap: 0;
    padding: 0 1.5rem 1.5rem;
    border-bottom: 1px solid var(--border);
    z-index: 199;
  }
  .nav-links.open { display: flex; }
  .nav-links li { border-bottom: 1px solid var(--border); }
  .nav-links li:last-child { border-bottom: none; margin-top: .75rem; }
  .nav-links a {
    display: block;
    padding: .9rem 0;
    font-size: .85rem;
    letter-spacing: .08em;
  }
  .nav-links a.nav-cta {
    display: inline-block;
    padding: .6rem 1.5rem;
  }
  /* 元の display:none を上書き */
  .feature-grid,
  .service-grid { grid-template-columns: 1fr; }
  .footer-top   { grid-template-columns: 1fr; gap: 2rem; }
  .footer-top > div:not(.footer-brand) { display: none; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .page-hero { min-height: 240px; padding-bottom: 3rem; }
  .section-inner,
  .section-inner-sm { padding: 4rem 1.5rem; }
}
@media (max-width: 480px) {
  .cta-banner { padding: 3rem 1.5rem; }
  .info-table th { width: 100px; }
}