/* ARCLIGHT — generative AI creative studio site
   Palette: deep navy + muted gold accent + warm off-white
   Type: Shippori Mincho (headline, serif JP) / Noto Sans JP (body) */

:root {
  --navy: #12172b;
  --navy-soft: #1c2340;
  --gold: #c9a227;
  --gold-soft: #e2c568;
  --teal: #1f6f6b;
  --ivory: #f7f5f0;
  --ivory-deep: #efece3;
  --ink: #1a1a1a;
  --line: rgba(18, 23, 43, 0.12);
  --max: 1120px;
  --radius: 2px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ivory);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  color: var(--navy);
  line-height: 1.5;
  margin: 0 0 0.6em;
  font-weight: 600;
}

p { margin: 0 0 1em; }

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

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 245, 240, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Shippori Mincho", serif;
  font-size: 20px;
  letter-spacing: 0.14em;
  color: var(--navy);
}

.logo svg { flex-shrink: 0; }

.logo .jp {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--teal);
  font-family: "Noto Sans JP", sans-serif;
  display: block;
  margin-top: 2px;
}

.logo-img { display: block; width: auto; }
.logo-img-header { height: 34px; }
.logo-img-footer { height: 28px; }

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

nav.main-nav a {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--navy);
  position: relative;
  padding: 4px 0;
}

nav.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

nav.main-nav a:hover::after,
nav.main-nav a.active::after {
  transform: scaleX(1);
}

nav.main-nav a.active { color: var(--gold); }

.nav-cta {
  background: var(--navy);
  color: var(--ivory) !important;
  padding: 10px 22px !important;
  border-radius: var(--radius);
  font-size: 13px !important;
  letter-spacing: 0.08em;
}

.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--gold); color: var(--navy) !important; }

.menu-toggle { display: none; }

/* ---------- Hero ---------- */

.hero {
  background: var(--navy);
  color: var(--ivory);
  padding: 120px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero .wrap { position: relative; z-index: 2; }

/* Hero background crossfade gallery */

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-item {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.4s ease;
}

.hero-bg-item.active { opacity: 1; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold-soft);
  border: 1px solid rgba(226,197,104,0.4);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 28px;
}

.hero h1 {
  color: var(--ivory);
  font-size: clamp(32px, 5vw, 54px);
  max-width: 15ch;
  margin-bottom: 24px;
}

.hero .lead {
  max-width: 46ch;
  font-size: 17px;
  color: rgba(247,245,240,0.82);
  margin-bottom: 40px;
}

.btn {
  display: inline-block;
  padding: 15px 34px;
  font-size: 14px;
  letter-spacing: 0.08em;
  border-radius: var(--radius);
  transition: all 0.25s ease;
}

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

.btn-primary:hover { background: var(--gold-soft); }

.btn-outline {
  border: 1px solid rgba(247,245,240,0.5);
  color: var(--ivory);
  margin-left: 14px;
}

.btn-outline:hover { border-color: var(--gold); color: var(--gold-soft); }

.btn-dark {
  background: var(--navy);
  color: var(--ivory);
}
.btn-dark:hover { background: var(--teal); }

/* ---------- Sections ---------- */

section { padding: 96px 0; }
section.alt { background: var(--ivory-deep); }

.section-head {
  margin-bottom: 56px;
  max-width: 60ch;
}

.section-head .kicker {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--teal);
  display: block;
  margin-bottom: 14px;
}

.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); }

/* Grids */

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
  align-items: center;
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  padding: 36px 30px;
  border-radius: var(--radius);
}

.card .num {
  font-family: "Shippori Mincho", serif;
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.14em;
  display: block;
  margin-bottom: 18px;
}

.card h3 { font-size: 19px; margin-bottom: 12px; }

.card p { font-size: 14.5px; color: #444; margin-bottom: 0; }

/* Problem list */

.problem-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.problem-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  font-size: 15px;
  color: #333;
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}

.problem-list li .mark {
  font-family: "Shippori Mincho", serif;
  color: var(--gold);
  font-size: 20px;
  line-height: 1;
}

/* Case study feature */

.case-feature {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.case-feature img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.case-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  background: var(--navy);
  color: var(--gold-soft);
  padding: 5px 12px;
  margin-bottom: 18px;
}

.case-feature .meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 26px 0;
  font-size: 13.5px;
}

.case-feature .meta dt { color: var(--teal); letter-spacing: 0.06em; margin-bottom: 4px; }
.case-feature .meta dd { margin: 0; color: #333; }

/* Process */

.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  counter-reset: step;
}

.process-list li {
  list-style: none;
  position: relative;
  padding-top: 46px;
}

.process-list li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  font-family: "Shippori Mincho", serif;
  font-size: 26px;
  color: var(--gold);
}

.process-list h3 { font-size: 16px; margin-bottom: 8px; }
.process-list p { font-size: 13.5px; color: #444; }

/* CTA band */

.cta-band {
  background: var(--navy);
  color: var(--ivory);
  padding: 76px 0;
  text-align: center;
}

.cta-band h2 { color: var(--ivory); }
.cta-band p { color: rgba(247,245,240,0.78); max-width: 50ch; margin-inline: auto; margin-bottom: 34px; }

/* Footer */

footer {
  background: var(--ivory-deep);
  border-top: 1px solid var(--line);
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

footer .logo { margin-bottom: 14px; }
footer p.desc { font-size: 13.5px; color: #555; max-width: 34ch; }

footer h4 { font-size: 13px; letter-spacing: 0.08em; color: var(--navy); margin-bottom: 16px; }

footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
footer ul a { font-size: 13.5px; color: #444; }
footer ul a:hover { color: var(--gold); }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 22px;
  font-size: 12px;
  color: #777;
  display: flex;
  justify-content: space-between;
}

/* Portfolio */

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.portfolio-card {
  background: #fff;
  border: 1px solid var(--line);
  overflow: hidden;
}

.portfolio-card .thumb {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--ivory-deep);
}

.portfolio-card .thumb img { width: 100%; height: 100%; object-fit: cover; }

.portfolio-card .body { padding: 26px 28px; }

.portfolio-card h3 { font-size: 17px; margin-bottom: 8px; }
.portfolio-card p { font-size: 13.5px; color: #444; }

.tag-row { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.tag {
  font-size: 11px;
  letter-spacing: 0.06em;
  background: var(--ivory-deep);
  color: var(--teal);
  padding: 4px 10px;
  border: 1px solid var(--line);
}

.coming-soon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 10px;
  color: #999;
}

.coming-soon .ring {
  width: 56px; height: 56px;
  border: 1.5px dashed #bbb;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Shippori Mincho", serif;
  font-size: 13px;
}

/* Pricing */

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

.price-card {
  background: #fff;
  border: 1px solid var(--line);
  padding: 40px 30px;
  display: flex;
  flex-direction: column;
}

.price-card.featured {
  border-color: var(--gold);
  box-shadow: 0 20px 40px rgba(18,23,43,0.08);
  position: relative;
}

.price-card.featured::before {
  content: "おすすめ";
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--gold);
  color: var(--navy);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 12px;
}

.price-card h3 { font-size: 19px; }
.price-card .price-note {
  font-size: 13px;
  color: var(--teal);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}

.price-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: grid;
  gap: 12px;
  flex-grow: 1;
}

.price-card ul li {
  font-size: 13.5px;
  color: #333;
  padding-left: 18px;
  position: relative;
}

.price-card ul li::before {
  content: "―";
  position: absolute;
  left: 0;
  color: var(--gold);
}

.price-note-block {
  margin-top: 40px;
  font-size: 13px;
  color: #666;
  border-left: 2px solid var(--gold);
  padding-left: 20px;
}

/* Page hero (inner pages) */

.page-hero {
  background: var(--navy);
  color: var(--ivory);
  padding: 76px 0 68px;
}

.page-hero .kicker { color: var(--gold-soft); font-size: 12px; letter-spacing: 0.2em; display: block; margin-bottom: 16px; }
.page-hero h1 { color: var(--ivory); font-size: clamp(28px, 4vw, 42px); max-width: 22ch; }
.page-hero p { color: rgba(247,245,240,0.78); max-width: 52ch; font-size: 15px; }

/* Company page */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.value-list { display: grid; gap: 26px; }
.value-list .item { display: flex; gap: 18px; }
.value-list .item .mark {
  font-family: "Shippori Mincho", serif;
  color: var(--gold);
  font-size: 22px;
}
.value-list h3 { font-size: 16px; margin-bottom: 6px; }
.value-list p { font-size: 13.5px; color: #444; margin: 0; }

table.overview {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
table.overview th, table.overview td {
  text-align: left;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.overview th {
  width: 32%;
  color: var(--teal);
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* Contact form */

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
}

.contact-info .item { margin-bottom: 28px; }
.contact-info h4 { font-size: 13px; letter-spacing: 0.08em; color: var(--teal); margin-bottom: 8px; }
.contact-info p { font-size: 14.5px; }

form.contact-form {
  display: grid;
  gap: 20px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

label {
  display: block;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin-bottom: 8px;
}

input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  padding: 13px 14px;
  font-family: inherit;
  font-size: 14px;
  border-radius: var(--radius);
  color: var(--ink);
}

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

textarea { resize: vertical; min-height: 130px; }

.hidden-field { position: absolute; left: -9999px; }

.form-note {
  font-size: 12.5px;
  color: #777;
  margin-top: -6px;
}

.submit-status {
  font-size: 13.5px;
  color: var(--teal);
  display: none;
}
.submit-status.show { display: block; }

/* Reveal-on-scroll (progressive enhancement only; content visible by default) */
.reveal {
  transform: translateY(14px);
  opacity: 1;
  transition: transform 0.6s ease;
}
.reveal.in { transform: translateY(0); }

@media (max-width: 880px) {
  nav.main-nav { display: none; }
  .grid-3, .grid-2, .case-feature, .about-grid, .contact-layout, .portfolio-grid, .pricing-grid, .footer-grid { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .hero { padding: 90px 0 70px; }
  section { padding: 64px 0; }
}