:root {
  --color-bg: #ffffff;
  --color-alt: #f5f6f8;
  --color-text: #1f2430;
  --color-muted: #5b6473;
  --color-accent: #4f5dd1;
  --color-accent-dark: #3d49ac;
  --color-border: #e4e6eb;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(31, 36, 48, 0.08);
  --max-width: 960px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: 0.25s;
}

/* Hero */
.hero {
  padding: 120px 0 100px;
  text-align: center;
  background: linear-gradient(180deg, #f5f6ff 0%, #ffffff 100%);
}

.hero-eyebrow {
  color: var(--color-accent);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  margin: 12px 0 20px;
  letter-spacing: 0.01em;
}

.hero-lead {
  color: var(--color-muted);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
}

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

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
}

.btn-ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: 90px 0;
}

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

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 32px;
  position: relative;
  padding-bottom: 12px;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 44px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 3px;
}

.section-text {
  color: var(--color-muted);
  font-size: 1.02rem;
  max-width: 680px;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 8px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.card-link {
  display: inline-block;
  margin-top: 14px;
  color: var(--color-accent);
  font-size: 0.92rem;
  font-weight: 500;
}

.card-link:hover {
  color: var(--color-accent-dark);
}

/* Contact */
.contact-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 24px 0 32px;
}

.contact-link {
  padding: 10px 22px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  background: #fff;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.contact-form {
  max-width: 540px;
}

.form-row {
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 0.9rem;
  font-weight: 500;
}

.form-row input,
.form-row textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 11px 14px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(79, 93, 209, 0.12);
}

.form-row textarea {
  resize: vertical;
}

.form-status {
  font-size: 0.9rem;
  margin-bottom: 14px;
  min-height: 1.2em;
}

.form-status.error {
  color: #d23b3b;
}

.form-status.success {
  color: #2e9a55;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 0;
  text-align: center;
}

.site-footer p {
  color: var(--color-muted);
  font-size: 0.88rem;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-links.open {
    max-height: 280px;
  }

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

  .nav-links a {
    display: block;
    padding: 14px 24px;
  }

  .hero {
    padding: 90px 0 70px;
  }

  .section {
    padding: 64px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}