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

:root {
  --navy: #1a2f5e;
  --navy-light: #2a4080;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-600: #475569;
  --gray-800: #1e293b;
  --white: #ffffff;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--gray-800);
  line-height: 1.7;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e2e8f0;
  z-index: 100;
}
.header-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--navy);
  text-decoration: none;
  letter-spacing: 0.05em;
}
.logo-ai { color: var(--accent); }
.nav {
  display: flex;
  gap: 2rem;
  font-size: 0.875rem;
  color: var(--gray-600);
}
.nav a {
  color: var(--gray-600);
  text-decoration: none;
  transition: color 0.2s;
}
.nav a:hover { color: var(--accent); }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 0.75rem 2rem;
  border-radius: 4px;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.2s;
}
.btn:hover { background: var(--navy-light); }

.hero .btn, .bg-dark .btn {
  background: #f97316;
  color: var(--white);
  box-shadow: 0 4px 14px rgba(249,115,22,0.4);
}
.hero .btn:hover, .bg-dark .btn:hover {
  background: #ea580c;
}
.btn-sm { padding: 0.5rem 1.25rem; font-size: 0.875rem; }
.btn-lg { padding: 1rem 2.5rem; font-size: 1rem; }
.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: var(--white); }

/* Hero */
.hero {
  padding: 6rem 1.5rem 4rem;
  background: linear-gradient(150deg, #1e3a6e 0%, #2563eb 60%, #60a5fa 100%);
  color: var(--white);
  text-align: center;
}
.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.hero-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.8);
  margin-bottom: 1rem;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
}
.hero-sub {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 2rem;
}

/* Section */
.section { padding: 5rem 1.5rem; }
.bg-light { background: var(--gray-50); }
.bg-dark {
  background: linear-gradient(150deg, #1e3a6e 0%, #2563eb 60%, #60a5fa 100%);
  color: var(--white);
}
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--navy);
}
.section-title.light { color: var(--white); }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.card {
  background: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  border: 1px solid #e2e8f0;
}
.card-icon { font-size: 2rem; margin-bottom: 1rem; }
.card h3 { font-size: 1.125rem; font-weight: 700; color: var(--navy); margin-bottom: 0.75rem; }
.card p { font-size: 0.9rem; color: var(--gray-600); }

/* School Link */
.school-link {
  text-align: center;
  padding: 2rem;
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  background: var(--white);
}
.school-link p { font-size: 0.9rem; color: var(--gray-600); margin-bottom: 1rem; }

/* About */
.about-inner { max-width: 640px; margin: 0 auto; }
.about-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 1rem;
}
.about-name span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--gray-600);
  margin-left: 0.75rem;
}
.about-text { color: var(--gray-600); margin-bottom: 1.5rem; }
.about-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.about-list li {
  padding-left: 1.25rem;
  position: relative;
  color: var(--gray-600);
  font-size: 0.9375rem;
}
.about-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Contact */
.contact-inner { text-align: center; }
.contact-sub { color: #cbd5e1; margin-bottom: 2rem; font-size: 0.9375rem; }
.contact-box { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.contact-note { font-size: 0.875rem; color: #94a3b8; }

/* Footer */
.footer {
  background: var(--white);
  border-top: 1px solid #e2e8f0;
  color: var(--gray-600);
  padding: 2rem 1.5rem;
  text-align: center;
}
.footer-brand { font-weight: 700; color: var(--navy); margin-bottom: 0.5rem; }
.footer-copy { font-size: 0.8125rem; }

/* Hero subtitle */
.hero-title-sub {
  font-size: 0.6em;
  font-weight: 700;
  color: var(--white);
  display: block;
  margin-top: 0.5rem;
}

/* Pain Points */
.pain-list {
  list-style: none;
  max-width: 900px;
  margin: 0 auto 2.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1rem;
}
.pain-list li {
  padding: 1.25rem 1.5rem;
  background: var(--white);
  border-radius: 12px;
  font-size: 0.9375rem;
  color: var(--gray-600);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.pain-list li::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.pain-list li strong { color: var(--navy); }
.pain-cta {
  text-align: center;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--navy);
  margin-top: 2rem;
}

/* Utilities */
.pc-only { display: none; }
@media (min-width: 768px) {
  .pc-only { display: inline; }
  .nav { display: flex; }
}
@media (max-width: 767px) {
  .nav { display: none; }
  .hero { padding: 7rem 1.5rem 4rem; }
  .section { padding: 3.5rem 1.5rem; }
}