:root {
  --primary: #00a7e7;
  --primary-dark: #0078b8;
  --secondary: #1bbf83;
  --accent: #ffb400;
  --accent-dark: #f28c00;
  --text: #222;
  --muted: #666;
  --bg: #f7fbff;
  --white: #fff;
  --line: #d9e7f2;
  --danger: #ff5f5f;
  --shadow: 0 12px 30px rgba(0, 67, 112, 0.08);
  --radius: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
}

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

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

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

.section {
  padding: 88px 0;
}

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

.center {
  text-align: center;
}

.section-heading {
  margin-bottom: 48px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(0, 167, 231, 0.1);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.section-heading h2 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.3;
}

.section-text {
  max-width: 760px;
  margin: 0 auto;
  color: var(--muted);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #eef4f8;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.logo {
  font-weight: 800;
  letter-spacing: 0.04em;
}

.logo span {
  color: var(--primary-dark);
}

.header-nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 700;
  transition: 0.25s ease;
  border: 2px solid transparent;
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary), #109d6a);
  color: var(--white);
  box-shadow: var(--shadow);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--white);
  box-shadow: var(--shadow);
}

.btn-outline {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--white);
}

.btn-block {
  width: 100%;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 88px;
  background:
    radial-gradient(circle at top left, rgba(0, 167, 231, 0.18), transparent 35%),
    radial-gradient(circle at top right, rgba(255, 180, 0, 0.18), transparent 30%),
    linear-gradient(180deg, #eef9ff 0%, #ffffff 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
}

.hero-lead {
  margin: 0 0 16px;
  font-weight: 700;
  color: var(--primary-dark);
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 5vw, 60px);
  line-height: 1.15;
}

.hero-sub {
  font-size: 18px;
  margin: 0 0 24px;
}

.hero-sub strong {
  color: var(--danger);
}

.hero-period {
  display: inline-block;
  padding: 18px 22px;
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.period-label {
  margin: 0 0 4px;
  font-size: 13px;
  color: var(--muted);
}

.period-date {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
}

.period-note {
  margin: 6px 0 0;
  color: var(--muted);
}

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

.hero-cards {
  display: grid;
  gap: 20px;
}

.benefit-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  border: 1px solid #edf4f8;
}

.benefit-number {
  display: inline-flex;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--white);
  background: var(--primary);
  margin-bottom: 14px;
}

.benefit-title {
  margin: 0 0 8px;
  font-weight: 800;
  color: var(--primary-dark);
}

.benefit-text {
  margin: 0 0 8px;
  color: var(--muted);
}

.benefit-price {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.benefit-price strong {
  font-size: 36px;
  color: var(--danger);
}

.benefit-gift {
  margin: 0;
  font-weight: 700;
  color: var(--secondary);
}

/* Problems */
.problem-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.problem-item {
  padding: 22px 20px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 8px 20px rgba(20, 80, 120, 0.05);
  font-weight: 700;
  text-align: center;
}

/* Issues */
.issue-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.issue-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.issue-tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 180, 0, 0.18);
  color: #7a5300;
  font-size: 12px;
  font-weight: 800;
}

.issue-card h3 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.4;
}

.issue-card p {
  margin: 0;
  color: var(--muted);
}

/* Reasons */
.reason-list {
  display: grid;
  gap: 24px;
}

.reason-card {
  background: linear-gradient(135deg, #ffffff, #f6fcff);
  border: 1px solid #e3f0f8;
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
}

.reason-content h3 {
  margin: 0 0 12px;
  font-size: 26px;
}

.reason-content p {
  margin: 0 0 10px;
  color: var(--muted);
}

.text-link {
  color: var(--primary-dark);
  font-weight: 700;
}

/* Banner */
.campaign-banner {
  padding: 28px 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: var(--white);
  text-align: center;
}

.campaign-text,
.campaign-date {
  margin: 0;
  font-weight: 700;
}

.campaign-date {
  margin-top: 6px;
  font-size: 22px;
}

/* Courses */
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.course-card {
  background: var(--white);
  border: 1px solid #eaf2f8;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.course-card.featured {
  border: 2px solid rgba(0, 167, 231, 0.4);
  transform: translateY(-4px);
}

.course-header {
  margin-bottom: 18px;
}

.course-header h3 {
  margin: 0 0 6px;
  font-size: 28px;
  line-height: 1.3;
}

.course-target {
  margin: 0;
  color: var(--primary-dark);
  font-weight: 700;
}

.course-spec {
  list-style: none;
  padding: 0;
  margin: 0 0 22px;
}

.course-spec li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed #d6e5ef;
}

.course-spec span {
  font-size: 13px;
  color: var(--muted);
}

.course-spec strong {
  font-size: 18px;
}

/* Benefits */
.benefit-wrap {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.benefit-box {
  background: var(--white);
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.benefit-box h3 {
  margin: 0 0 14px;
  font-size: 24px;
}

.benefit-box ul {
  margin: 0;
  padding-left: 1.2em;
}

.benefit-box li + li {
  margin-top: 10px;
}

.final-cta {
  margin-top: 40px;
  padding: 36px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #e8f8ff, #fff9ea);
  text-align: center;
}

.final-cta h3 {
  margin: 0 0 10px;
  font-size: 30px;
}

.final-cta p {
  margin: 0 0 24px;
  color: var(--muted);
}

.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* Footer */
.site-footer {
  background: #0f2d3d;
  color: rgba(255, 255, 255, 0.9);
  padding-top: 56px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  padding-bottom: 36px;
}

.footer-brand h2 {
  margin: 0 0 16px;
  color: #fff;
  font-size: 30px;
}

.footer-brand p {
  margin: 0 0 8px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 18px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.88);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 0;
  text-align: center;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-inner,
  .course-grid,
  .issue-grid,
  .benefit-wrap,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .problem-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .course-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 68px 0;
  }

  .header-inner {
    flex-direction: column;
    justify-content: center;
    padding: 14px 0;
  }

  .header-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding-top: 52px;
  }

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

  .btn,
  .btn-block {
    width: 100%;
  }

  .problem-list {
    grid-template-columns: 1fr;
  }

  .campaign-date {
    font-size: 18px;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }
}