/* Kagayaki — corporate landing */

:root {
  --bg-deep: #0a0e14;
  --bg-card: #121820;
  --bg-elevated: #1a222d;
  --text: #e8edf4;
  --text-muted: #8b98a8;
  --accent: #3dd6c6;
  --accent-dim: rgba(61, 214, 198, 0.15);
  --accent-glow: rgba(61, 214, 198, 0.35);
  --border: rgba(255, 255, 255, 0.08);
  --font-sans: "DM Sans", "Noto Sans JP", system-ui, sans-serif;
  --font-jp: "Noto Sans JP", "DM Sans", system-ui, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --header-h: 72px;
  --max-w: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

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

html[lang="ja"] body {
  font-family: "Noto Sans JP", "Noto Sans SC", var(--font-sans), system-ui, sans-serif;
}

html[lang^="zh"] body {
  font-family: "Noto Sans SC", "Noto Sans JP", system-ui, sans-serif;
}

html[lang="en"] body {
  font-family: var(--font-sans), "Noto Sans JP", "Noto Sans SC", system-ui, sans-serif;
}

.container {
  width: min(100% - 40px, var(--max-w));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 3px;
  text-decoration: none;
  color: var(--text);
  line-height: 0;
}

.logo-sub {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  font-family: "Noto Sans JP", "Noto Sans SC", var(--font-sans), system-ui, sans-serif;
  line-height: 1.2;
}

.logo-img {
  display: block;
  height: 46px;
  width: auto;
  max-width: min(200px, 42vw);
  object-fit: contain;
  object-position: left center;
  filter: invert(1) brightness(1.12);
}

.logo-img--footer {
  height: 36px;
  max-width: 160px;
  opacity: 0.92;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

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

.nav-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-list a:hover {
  color: var(--text);
}

.lang-switch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0.2rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.lang-btn {
  margin: 0;
  padding: 0.4rem 0.55rem;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.lang-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.lang-btn.is-active {
  color: var(--bg-deep);
  background: var(--accent);
}

.lang-btn.is-active:hover {
  color: var(--bg-deep);
  filter: brightness(1.05);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1.25rem 20px 1.5rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s ease, opacity 0.25s ease, visibility 0.25s;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .nav-list li {
    width: 100%;
    border-bottom: 1px solid var(--border);
  }

  .nav-list a {
    display: block;
    padding: 0.85rem 0;
  }

  .lang-switch {
    margin-top: 1rem;
    justify-content: flex-start;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 3rem) 0 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 55% at 70% 0%, var(--accent-dim), transparent 55%),
    radial-gradient(ellipse 60% 40% at 10% 80%, rgba(45, 90, 120, 0.2), transparent 50%),
    linear-gradient(180deg, var(--bg-deep) 0%, #0d1218 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-tag {
  margin: 0 0 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-title {
  margin: 0 0 1.25rem;
  font-size: clamp(1.85rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.hero-br {
  display: none;
}

@media (min-width: 520px) {
  .hero-br {
    display: inline;
  }
}

.hero-accent {
  color: var(--accent);
  text-shadow: 0 0 40px var(--accent-glow);
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 36rem;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  font-family: var(--font-jp);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-deep);
  box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 0 32px var(--accent-glow);
  filter: brightness(1.05);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  background: var(--bg-elevated);
}

.btn-lg {
  padding: 0.95rem 1.75rem;
  font-size: 1rem;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section:nth-of-type(even) {
  background: var(--bg-card);
}

.section-head {
  margin-bottom: 3rem;
  max-width: 36rem;
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.card-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}

.card {
  padding: 1.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.section:nth-of-type(even) .card {
  background: var(--bg-deep);
}

.card:hover {
  border-color: rgba(61, 214, 198, 0.25);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

.card-icon {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.card-title {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 700;
}

.card-body {
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card-tags li {
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
}

/* Steps */
.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 900px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

.step {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.approach .step {
  background: var(--bg-card);
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  color: var(--bg-deep);
  background: var(--accent);
  border-radius: 10px;
}

.step-title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
}

.step-body p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* CTA */
.cta {
  padding: 5.5rem 0;
  background:
    linear-gradient(135deg, rgba(61, 214, 198, 0.12) 0%, transparent 50%),
    var(--bg-deep);
  border-top: 1px solid var(--border);
}

.cta-inner {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 768px) {
  .cta-inner {
    grid-template-columns: 1fr auto;
    gap: 3rem;
  }
}

.cta-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 700;
}

.cta-text {
  margin: 0;
  color: var(--text-muted);
  max-width: 32rem;
}

.cta-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.cta-note {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 280px;
  line-height: 1.5;
}

.cta-note code {
  font-size: 0.75rem;
  padding: 0.15rem 0.4rem;
  background: var(--bg-elevated);
  border-radius: 4px;
  color: var(--accent);
}

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

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 0;
}

.footer-copy {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}