/* ============================================
   fUat Landing Page - Steel Sky Aurora theme
   ============================================ */

:root {
  --aurora-1: #BDD4E9;
  --aurora-2: #C6CCEB;
  --aurora-3: #BBD9EA;
  --primary-blue: #5490C4;
  --deep-blue: #3A72A8;
  --dark-text: #1A3E80;
  --darkest-text: #0F1E30;
  --lavender: #9298C8;
  --wordmark: #2C4E72;
  --glass-bg: rgba(255, 255, 255, 0.68);
  --glass-bg-strong: rgba(248, 251, 255, 0.92);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', 'Outfit', -apple-system, 'Segoe UI', sans-serif;
  font-weight: 400;
  line-height: 1.7;
  color: var(--darkest-text);
  background: linear-gradient(158deg, var(--aurora-1), var(--aurora-2), var(--aurora-3));
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: -20%;
  left: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(132, 165, 200, 0.25), transparent 70%);
  filter: blur(60px);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  bottom: -20%;
  right: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(146, 152, 200, 0.20), transparent 70%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
}

/* =====================
   Header
   ===================== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: block;
}

.brand-name {
  font-family: 'Outfit', sans-serif;
  font-weight: 400;
  font-size: 24px;
  letter-spacing: 6px;
  color: var(--wordmark);
}

.social {
  display: flex;
  gap: 18px;
}

.social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  color: var(--deep-blue);
  text-decoration: none;
  transition: all 0.25s ease;
}

.social a:hover {
  background: var(--primary-blue);
  color: #fff;
  transform: translateY(-2px);
}

/* =====================
   Hero
   ===================== */
.hero {
  text-align: center;
  padding: 80px 24px 100px;
  max-width: 760px;
  margin: 0 auto;
}

.hero-logo {
  margin-bottom: 32px;
  animation: float 6s ease-in-out infinite;
}

.hero-logo img {
  filter: drop-shadow(0 8px 32px rgba(58, 114, 168, 0.18));
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: clamp(32px, 6vw, 56px);
  line-height: 1.3;
  color: var(--darkest-text);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-tagline-en {
  font-family: 'Outfit', sans-serif;
  font-weight: 300;
  font-size: clamp(16px, 2.5vw, 22px);
  color: var(--deep-blue);
  margin-bottom: 32px;
  letter-spacing: 0.05em;
}

.hero-sub {
  font-size: clamp(15px, 2vw, 17px);
  line-height: 2;
  color: var(--dark-text);
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-sub strong {
  color: var(--primary-blue);
  font-weight: 500;
}

.hero-launch {
  display: inline-block;
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 8px 20px;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(84, 144, 196, 0.3);
  border-radius: 999px;
  color: var(--primary-blue);
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-block;
  padding: 14px 32px;
  background: var(--primary-blue);
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  border-radius: 999px;
  font-size: 15px;
  transition: all 0.25s ease;
  box-shadow: 0 6px 20px rgba(84, 144, 196, 0.3);
}

.hero-cta:hover {
  background: var(--deep-blue);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(58, 114, 168, 0.4);
}

/* =====================
   Features
   ===================== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 24px;
  padding: 40px 32px;
  text-align: left;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(58, 114, 168, 0.12);
  background: rgba(255, 255, 255, 0.78);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary-blue), var(--deep-blue));
  color: #fff;
  margin-bottom: 20px;
  box-shadow: 0 6px 18px rgba(84, 144, 196, 0.3);
}

.feature-card h2 {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--darkest-text);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--dark-text);
}

/* =====================
   CTA
   ===================== */
.cta {
  max-width: 760px;
  margin: 0 auto 80px;
  padding: 60px 32px;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 28px;
  text-align: center;
}

.cta h2 {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: clamp(22px, 3.5vw, 28px);
  color: var(--darkest-text);
  margin-bottom: 16px;
}

.cta p {
  font-size: 15px;
  line-height: 2;
  color: var(--dark-text);
  margin-bottom: 28px;
}

.cta-mail {
  display: inline-block;
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: clamp(18px, 2.5vw, 22px);
  color: var(--primary-blue);
  text-decoration: none;
  margin-bottom: 24px;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease;
}

.cta-mail:hover {
  border-bottom-color: var(--primary-blue);
}

.cta-social {
  font-size: 14px;
  color: var(--dark-text);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.cta-social a {
  color: var(--deep-blue);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.cta-social a:hover {
  color: var(--primary-blue);
}

.cta-social span {
  color: var(--lavender);
}

/* =====================
   Footer
   ===================== */
.site-footer {
  text-align: center;
  padding: 32px 24px 40px;
  font-size: 13px;
  color: var(--dark-text);
  opacity: 0.7;
  font-family: 'Outfit', sans-serif;
  letter-spacing: 0.02em;
}

/* =====================
   Responsive
   ===================== */
@media (max-width: 640px) {
  .site-header {
    padding: 16px 20px;
  }

  .brand-name {
    font-size: 20px;
    letter-spacing: 4px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .social {
    gap: 10px;
  }

  .social a {
    width: 34px;
    height: 34px;
  }

  .hero {
    padding: 60px 20px 80px;
  }

  .hero-logo img {
    width: 140px;
    height: 140px;
  }

  .features {
    padding: 20px 20px 60px;
  }

  .feature-card {
    padding: 32px 24px;
  }

  .cta {
    padding: 48px 24px;
    margin: 0 16px 60px;
    border-radius: 20px;
  }

  .cta-social {
    flex-direction: column;
    gap: 4px;
  }

  .cta-social span {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-logo {
    animation: none;
  }

  .hero-cta:hover,
  .feature-card:hover,
  .social a:hover {
    transform: none;
  }
}