:root {
  --color-bg: #ffffff;
  --color-bg-alt: #eef2fb;
  --color-text: #14181f;
  --color-text-muted: #565f72;
  --color-border: #dbe2f0;
  --color-primary: #1d4ed8;
  --color-primary-dark: #15399e;
  --color-primary-tint: #e7edfc;
  --color-accent: #0d8f82;
  --color-accent-tint: #e2f5f3;
  --color-violet: #7c3aed;
  --color-violet-tint: #f1eafe;
  --color-danger: #c23b3b;
  --max-width: 1080px;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.logo-img {
  height: 40px;
  width: auto;
  display: block;
}

.site-nav ul {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-block;
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  padding: 8px 16px;
  border-radius: 999px;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav a:hover {
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.site-nav a.is-active {
  color: var(--color-primary);
  background: var(--color-primary-tint);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
}

/* Home hero */
.hero {
  padding: 88px 0;
  background-color: var(--color-primary);
  background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 22px 22px;
  color: #fff;
}

.hero-slider {
  overflow: hidden;
}

.hero-track {
  display: flex;
  align-items: stretch;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-slide {
  flex: none;
  min-width: 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.hero-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: background-color 0.2s ease, width 0.2s ease;
}

.hero-dot:hover {
  background: rgba(255, 255, 255, 0.6);
}

.hero-dot.is-active {
  width: 22px;
  background: #fff;
}

.hero-dot:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.hero-eyebrow {
  color: #cfdcff;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 0 0 14px;
  font-size: 0.9rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin: 0 0 20px;
  line-height: 1.45;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.hero-lead {
  color: #dbe5ff;
  font-size: 1.05rem;
  max-width: 34em;
  margin: 0 0 32px;
}

.hero-image {
  width: 90%;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 16px 24px 24px rgba(6, 14, 40, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-on-primary {
  background: #fff;
  color: var(--color-primary-dark);
}

.btn-on-primary:hover {
  background: #dbe5ff;
}

/* Page hero (internal pages) */
.page-hero {
  position: relative;
  overflow: hidden;
  padding: 56px 0 44px;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: -60%;
  background-image: url("../images/logo.svg");
  background-repeat: repeat;
  background-size: 180px 180px;
  opacity: 0.14;
  transform: rotate(-20deg);
  pointer-events: none;
}

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

.page-hero .eyebrow {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
}

.page-hero h1 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin: 0;
}

.page-hero p {
  color: var(--color-text-muted);
  margin: 12px 0 0;
  max-width: 42em;
}

/* Banner image (about page) */
.banner-image {
  border-bottom: 1px solid var(--color-border);
}

.banner-image img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
}

/* Sections */
.section {
  padding: 88px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 12px;
}

.section-lead {
  color: var(--color-text-muted);
  margin: 0 0 48px;
  max-width: 42em;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}

.link-arrow {
  white-space: nowrap;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
}

.link-arrow:hover {
  text-decoration: underline;
}

/* About */
.about-philosophy {
  margin-bottom: 56px;
}

.about-philosophy .eyebrow {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
}

.about-philosophy h3 {
  margin-top: 0;
  margin-bottom: 18px;
  font-size: 1.85rem;
  letter-spacing: 0.01em;
  display: inline-block;
  color: var(--color-primary-dark);
  background: linear-gradient(100deg, var(--color-primary) 0%, var(--color-accent) 55%, var(--color-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.about-philosophy p {
  color: var(--color-text-muted);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: stretch;
}

.about-logo-panel {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-name-note {
  margin-bottom: 28px;
  font-size: 1.02rem;
  line-height: 1.85;
  text-wrap: pretty;
}

.about-name-note strong {
  font-size: 1.15em;
  font-weight: 800;
  color: var(--color-primary-dark);
  background: linear-gradient(100deg, var(--color-primary) 0%, var(--color-accent) 55%, var(--color-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.prism-breakdown {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 0 0 32px;
}

.prism-item {
  position: relative;
  padding: 30px 22px 24px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 18px rgba(20, 24, 31, 0.05);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.prism-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--item-gradient);
}

.prism-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(20, 24, 31, 0.1);
}

.prism-item-badge {
  display: inline-block;
  margin-bottom: 16px;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--item-gradient);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.prism-item p {
  margin: 0;
  max-width: none;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.prism-item--blue {
  --item-gradient: linear-gradient(135deg, var(--color-primary), #6a93f0);
}

.prism-item--teal {
  --item-gradient: linear-gradient(135deg, var(--color-accent), #34d6c4);
}

.prism-item--violet {
  --item-gradient: linear-gradient(135deg, var(--color-violet), #b18af5);
}

.about-mission {
  position: relative;
  max-width: none;
  margin: 0;
  padding: 28px 32px 26px 58px;
  border-radius: 14px;
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.04rem;
  font-style: italic;
  line-height: 1.9;
  text-wrap: pretty;
}

.about-mission::before {
  content: "\201C";
  position: absolute;
  top: 6px;
  left: 20px;
  font-size: 3.2rem;
  font-style: normal;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--color-primary), var(--color-violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.55;
}

.about-logo-mark {
  display: block;
  width: 380px;
  max-width: 100%;
  height: auto;
  opacity: 0.85;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.info-table th,
.info-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.info-table th {
  width: 30%;
  color: var(--color-text-muted);
  font-weight: 600;
  white-space: nowrap;
}


/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.service-card {
  display: block;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(20, 30, 60, 0.1);
}

.service-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  background: var(--color-primary-tint);
  margin-bottom: 16px;
}

.service-icon svg {
  width: 22px;
  height: 22px;
}

.service-card:nth-child(even) .service-icon {
  color: var(--color-accent);
  background: var(--color-accent-tint);
}

.service-card h3 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

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

/* Service detail list */
.service-details {
  border-top: 1px solid var(--color-border);
}

.service-detail-block {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: 84px;
}

.service-detail-image {
  border-radius: var(--radius);
  overflow: hidden;
  height: 260px;
  box-shadow: 12px 16px 32px rgba(20, 30, 60, 0.22);
}

.service-detail-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.service-detail-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 18px;
  padding-bottom: 18px;
  margin-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.service-detail-header .service-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  margin-bottom: 0;
  color: #fff;
  background: var(--color-primary);
}

.service-detail-header .service-icon svg {
  width: 26px;
  height: 26px;
}

.service-detail-header h3 {
  font-size: 1.35rem;
}

.service-detail-block:nth-child(even) .service-detail-header .service-icon {
  background: var(--color-accent);
}

.service-detail-header h3 {
  margin: 0;
  font-size: 1.2rem;
}

.service-detail-body {
  max-width: 640px;
}

.service-detail-body p {
  margin: 0;
  color: var(--color-text-muted);
  line-height: 1.9;
}

.service-detail-body strong {
  color: var(--color-text);
  font-weight: 700;
}

.service-detail-block p + p,
.service-detail-block ul + p {
  margin-top: 20px;
}

.service-detail-block p.client-note {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--color-primary-tint);
  border-left: 3px solid var(--color-primary);
  color: var(--color-text);
  font-weight: 600;
}

.service-detail-block:nth-child(even) p.client-note {
  background: var(--color-accent-tint);
  border-left-color: var(--color-accent);
}

.system-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.system-tags li {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
  padding: 9px 18px;
  border-radius: 999px;
}

.service-detail-block:nth-child(even) .system-tags li {
  background: var(--color-accent);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}

.tech-tags li {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-tint);
  padding: 3px 10px;
  border-radius: 999px;
}

.service-detail-block:nth-child(even) .tech-tags li {
  color: var(--color-accent);
  background: var(--color-accent-tint);
}

/* News */
.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.news-item {
  display: grid;
  grid-template-columns: 120px 140px 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.news-item time {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.news-tag {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--color-accent);
  background: var(--color-accent-tint);
  border-radius: 999px;
  padding: 4px 12px;
  width: fit-content;
  font-weight: 600;
}

.news-item p {
  margin: 0;
}

/* Contact form */
.contact-hint {
  max-width: 560px;
  margin: 0 0 40px;
  padding: 20px 24px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.contact-hint-title {
  margin: 0 0 12px;
  font-size: 1rem;
}

.contact-hint-list {
  margin: 0;
  padding-left: 20px;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.contact-hint-list li + li {
  margin-top: 6px;
}

.contact-form {
  max-width: 560px;
}

.form-status {
  display: none;
  margin: 20px 0 0;
  padding: 14px 16px;
  border-radius: 8px;
  font-weight: 600;
}

.form-status:not(:empty) {
  display: block;
}

.form-status-success {
  background: var(--color-accent-tint);
  color: var(--color-text);
  border-left: 3px solid var(--color-accent);
}

.form-status-error {
  background: #fdeaea;
  color: var(--color-danger);
  border-left: 3px solid var(--color-danger);
}

.form-row {
  margin-bottom: 20px;
}

.form-row label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.required {
  color: var(--color-danger);
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: 8px;
}

.optional {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: 8px;
}

.form-row input,
.form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--color-bg);
  color: var(--color-text);
}

.form-row input:focus,
.form-row textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

/* CTA banner */
.cta-banner {
  background: var(--color-primary);
  color: #fff;
  border-radius: 16px;
  padding: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.cta-banner h2 {
  margin: 0 0 6px;
  font-size: 1.3rem;
}

.cta-banner p {
  margin: 0;
  color: #dbe5ff;
}

@media (prefers-reduced-motion: reduce) {
  .service-card,
  .service-card:hover {
    transition: none;
    transform: none;
  }

  .hero-track {
    transition: none;
  }
}

/* Footer */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  text-align: center;
}

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

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease;
  }

  .site-nav.is-open {
    max-height: 260px;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
  }

  .site-nav li {
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav a {
    display: block;
    padding: 14px 0;
    border-radius: 0;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-image {
    order: -1;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .prism-breakdown {
    grid-template-columns: 1fr;
  }

  .service-detail-block {
    grid-template-columns: 1fr;
  }

  .service-detail-image {
    order: -1;
  }

  .info-table th {
    width: 38%;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }


  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .cta-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}