/* =========================
   Base
========================= */
:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-surface-alt: #eef3f7;
  --color-text: #1f2a33;
  --color-text-light: #5d6b76;
  --color-line: #d9e1e8;
  --color-primary: #1f5f8b;
  --color-primary-dark: #17496b;
  --color-accent: #7ea9c7;
  --color-hero-overlay: rgba(15, 26, 38, 0.45);
  --shadow-soft: 0 8px 24px rgba(22, 38, 53, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    "Hiragino Sans",
    "Yu Gothic",
    "Yu Gothic UI",
    "Meiryo",
    sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

.container {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
}

/* =========================
   Header
========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(217, 225, 232, 0.7);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.site-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-title-ja {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-title-en {
  font-size: 0.78rem;
  color: var(--color-text-light);
  margin-top: 4px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-nav a {
  font-size: 0.95rem;
  color: var(--color-text-light);
  transition: color 0.2s ease;
}

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

/* =========================
   Hero
========================= */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #dbe7f0;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--color-hero-overlay);
}

.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  padding: 88px 0 72px;
  max-width: 760px;
}

.hero-kicker {
  margin: 0 0 14px;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  opacity: 0.92;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  font-weight: 700;
}

.hero-text {
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 0 28px;
  color: rgba(255, 255, 255, 0.95);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}

.hero-note {
  margin: 12px 0 0;
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.86);
}

/* =========================
   Buttons
========================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-color 0.2s ease,
    color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 10px 24px rgba(20, 73, 107, 0.24);
}

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.24);
}

/* =========================
   Sections
========================= */
.section {
  padding: 88px 0;
  background: var(--color-surface);
}

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

.section h2 {
  margin: 0 0 20px;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.section p {
  margin: 0 0 16px;
}

.section-lead {
  max-width: 760px;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

/* =========================
   Layout blocks
========================= */
.two-column {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 44px;
  align-items: center;
}

.two-column.reverse {
  grid-template-columns: 0.9fr 1.1fr;
}

.text-block p:last-child {
  margin-bottom: 0;
}

.image-block img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  object-fit: cover;
}

/* =========================
   Feature Grid
========================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 28px;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(217, 225, 232, 0.6);
}

.feature-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.feature-card h3,
.feature-card p {
  padding-left: 22px;
  padding-right: 22px;
}

.feature-card h3 {
  margin: 20px 0 8px;
  font-size: 1.1rem;
}

.feature-card p {
  margin: 0 0 22px;
  color: var(--color-text-light);
}

/* =========================
   Info Grid
========================= */
.info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.info-item {
  background: var(--color-surface);
  border: 1px solid rgba(217, 225, 232, 0.75);
  border-radius: var(--radius-sm);
  padding: 20px 18px;
  box-shadow: 0 4px 16px rgba(22, 38, 53, 0.05);
}

.info-item h3 {
  margin: 0 0 10px;
  font-size: 0.98rem;
  color: var(--color-primary);
}

.info-item p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.65;
}

/* =========================
   Notice Box
========================= */
.notice-box {
  margin-top: 28px;
  padding: 24px;
  border-radius: var(--radius);
  background: #f8fbfd;
  border: 1px solid #d9e8f2;
}

.notice-box p:last-child {
  margin-bottom: 0;
}

/* =========================
   Lists
========================= */
.simple-list,
.flow-list {
  margin: 0;
  padding-left: 1.2em;
}

.simple-list li,
.flow-list li {
  margin-bottom: 10px;
}

.flow-list li::marker {
  font-weight: 700;
  color: var(--color-primary);
}

/* =========================
   FAQ
========================= */
.faq-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
}

.faq-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

.faq-item h3 {
  margin: 0 0 10px;
  font-size: 1.06rem;
}

.faq-item p {
  margin: 0;
  color: var(--color-text-light);
}

/* =========================
   Calendar
========================= */
.calendar-wrap {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  background: #fff;
  border: 1px solid rgba(217, 225, 232, 0.75);
}

.calendar-wrap iframe {
  display: block;
  width: 100%;
  min-height: 600px;
}

/* =========================
   Contact
========================= */
.contact-section {
  background:
    linear-gradient(180deg, rgba(126, 169, 199, 0.08), rgba(255, 255, 255, 0)),
    var(--color-surface);
}

.contact-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.contact-section .btn-secondary {
  background: #fff;
  color: var(--color-primary);
  border: 1px solid rgba(31, 95, 139, 0.28);
}

.contact-section .btn-secondary:hover {
  background: #f4f9fc;
}

/* =========================
   Footer
========================= */
.site-footer {
  background: #162634;
  color: rgba(255, 255, 255, 0.85);
  padding: 40px 0;
}

.footer-title {
  margin: 0 0 6px;
  font-weight: 700;
  font-size: 1rem;
}

.site-footer p {
  margin: 0 0 4px;
  font-size: 0.92rem;
}

/* =========================
   Responsive
========================= */
@media (max-width: 1024px) {
  .info-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .two-column,
  .two-column.reverse {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    min-height: auto;
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    gap: 14px;
  }

  .hero {
    min-height: 78vh;
  }

  .hero-content {
    padding: 76px 0 56px;
  }

  .hero-text {
    font-size: 1rem;
  }

  .section {
    padding: 68px 0;
  }

  .feature-grid,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .hero-buttons,
  .contact-buttons {
    flex-direction: column;
  }

  .calendar-wrap iframe {
    min-height: 500px;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 24px, var(--max-width));
  }

  .hero-kicker {
    font-size: 0.88rem;
  }

  .hero-note {
    font-size: 0.8rem;
  }

  .site-nav a {
    font-size: 0.9rem;
  }

  .section h2 {
    margin-bottom: 16px;
  }

  .calendar-wrap iframe {
    min-height: 460px;
  }
}