:root {
  --color-primary: #1a4fd6;
  --color-primary-dark: #0a2f8f;
  --color-accent: #2f6fed;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fc;
  --color-text: #1b2333;
  --color-text-muted: #5b6472;
  --color-border: #e3e8f0;
  --radius: 14px;
  --wrap: 1080px;
  --font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-display: "Space Grotesk", var(--font-jp);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-jp);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

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

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--color-text);
}
.brand:hover { color: var(--color-text); }

.brand-logo { height: 38px; width: auto; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  color: var(--color-text);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
}

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

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 700 !important;
}
.nav-cta:hover { background: var(--color-primary-dark); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 0 auto;
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 400px at 85% -10%, rgba(47,111,237,0.18), transparent 60%),
    radial-gradient(500px 400px at 10% 110%, rgba(10,47,143,0.12), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, #f4f7fc 100%);
  z-index: -1;
}

.hero-inner { max-width: 760px; }

.hero-logo {
  height: 88px;
  width: auto;
  margin: 0 0 28px;
}

.eyebrow {
  font-family: var(--font-display);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 700;
  margin: 0 0 18px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.35;
  margin: 0 0 24px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.hero-lead {
  color: var(--color-text-muted);
  font-size: 1.02rem;
  max-width: 620px;
  margin: 0 0 36px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 10px 24px -8px rgba(26, 79, 214, 0.55);
}
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }

.btn-ghost {
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- sections ---------- */

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

.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: 1.7rem;
  font-weight: 700;
  margin: 0 0 40px;
}
.section-title span {
  font-family: var(--font-display);
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 700;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 12px;
}

.section-lead {
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 0 40px;
}

.sub-heading {
  font-size: 1.1rem;
  margin: 48px 0 20px;
}

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-table {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}
.about-table > div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}
.about-table dt {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}
.about-table dd { margin: 0; }

.timeline h3 { margin-top: 0; }
.timeline ol { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 16px;
  padding: 0 0 22px 0;
  position: relative;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: 76px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}
.timeline time {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.9rem;
}
.timeline p { margin: 0; color: var(--color-text-muted); }

/* ---------- business ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 26px 24px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card:hover {
  box-shadow: 0 16px 32px -18px rgba(20, 40, 90, 0.25);
  transform: translateY(-3px);
}
.card h3 { margin: 0 0 10px; font-size: 1.02rem; }
.card p { margin: 0; color: var(--color-text-muted); font-size: 0.92rem; }

.card-highlight {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #eef4ff 0%, #ffffff 70%);
  border-color: #c9d9fb;
}
.card-highlight h3 { color: var(--color-primary-dark); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-cloud span {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---------- works ---------- */

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 48px;
}

.check-list { list-style: none; margin: 0; padding: 0; }
.check-list li {
  position: relative;
  padding: 10px 0 10px 28px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.94rem;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--color-accent);
  transform: rotate(45deg);
}

/* ---------- philosophy ---------- */

.philosophy-wrap { max-width: 760px; text-align: center; }
.philosophy-wrap .section-title { justify-content: center; }

.philosophy {
  margin: 0 0 32px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.7;
  color: var(--color-primary-dark);
}
.philosophy strong { color: var(--color-primary); }

.philosophy-wrap .section-lead { margin: 0 auto; text-align: center; }

/* ---------- recruit ---------- */

.recruit-wrap { max-width: 680px; text-align: center; }
.recruit-wrap .section-title { justify-content: center; }
.recruit-wrap .section-lead { margin: 0 auto 32px; text-align: center; }

/* ---------- contact ---------- */

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

.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-label {
  width: 90px;
  flex-shrink: 0;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
}

.mail-reveal {
  font: inherit;
  color: var(--color-primary);
  background: none;
  border: none;
  border-bottom: 1px dashed var(--color-primary);
  padding: 0;
  cursor: pointer;
}
.mail-reveal:hover { color: var(--color-primary-dark); }

.mail-note {
  width: 100%;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

/* ---------- footer ---------- */

.site-footer {
  padding: 32px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--color-border);
}
.site-footer p { margin: 0; }

/* ---------- reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .works-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 16px;
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--color-border); }
  .site-nav a:last-child { border-bottom: none; }
  .nav-cta { margin-top: 10px; text-align: center; }
  .nav-toggle { display: flex; }
  .hero { padding: 90px 0 70px; }
  .section { padding: 64px 0; }
}