/* FX AI Lab — Landing Page */
/* Design: Dark premium, no cartoon/fancy, motion-rich */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2332;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --gold: #f59e0b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255, 255, 255, 0.06);
  --gradient-hero: linear-gradient(180deg, #0a0e17 0%, #111827 100%);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Noto Sans JP', 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== Utility ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background 0.3s, backdrop-filter 0.3s;
}

.nav.scrolled {
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

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

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--accent);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(245, 158, 11, 0.04) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-3%, 3%) rotate(2deg); }
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 0.8s ease-out;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero h1 .gradient {
  background: linear-gradient(135deg, var(--accent), #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 460px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: transparent;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 500;
  border: 1px solid var(--border);
  transition: border-color 0.2s, color 0.2s;
}

.btn-secondary:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.hero-image {
  display: flex;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-image img {
  max-height: 620px;
  width: auto;
  max-width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5), 0 0 60px var(--accent-glow);
  transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
  transition: transform 0.4s;
}

.hero-image img:hover {
  transform: perspective(1000px) rotateY(0) rotateX(0);
}

/* ===== Sections ===== */
section {
  padding: 100px 0;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
}

/* ===== Features Grid ===== */
.features {
  background: var(--bg-secondary);
}

.features-header {
  text-align: center;
  margin-bottom: 64px;
}

.features-header .section-desc {
  margin: 0 auto;
}

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

.feature-card {
  padding: 32px;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border);
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.2);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-size: 24px;
  margin-bottom: 20px;
}

.feature-icon.blue { background: rgba(59, 130, 246, 0.15); }
.feature-icon.amber { background: rgba(245, 158, 11, 0.15); }
.feature-icon.emerald { background: rgba(16, 185, 129, 0.15); }
.feature-icon.purple { background: rgba(139, 92, 246, 0.15); }
.feature-icon.red { background: rgba(239, 68, 68, 0.15); }
.feature-icon.cyan { background: rgba(6, 182, 212, 0.15); }

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Showcase (alternating) ===== */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 60px 0;
}

.showcase-row.reverse {
  direction: rtl;
}

.showcase-row.reverse > * {
  direction: ltr;
}

.showcase-image img {
  width: 100%;
  max-width: 360px;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.showcase-text .section-title {
  font-size: clamp(22px, 3vw, 32px);
}

.showcase-text ul {
  list-style: none;
  margin-top: 20px;
}

.showcase-text ul li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--text-secondary);
}

.showcase-text ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

/* ===== Pricing ===== */
.pricing {
  background: var(--bg-secondary);
}

.pricing-header {
  text-align: center;
  margin-bottom: 48px;
}

.pricing-header .section-desc {
  margin: 0 auto;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 700px;
  margin: 0 auto;
}

.pricing-card {
  padding: 36px;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}

.pricing-card.featured::before {
  content: 'おすすめ';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
}

.pricing-plan {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}

.pricing-price span {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-note {
  font-size: 13px;
  color: var(--gold);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
}

.pricing-btn {
  display: block;
  text-align: center;
  padding: 12px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.pricing-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--accent-glow);
}

.pricing-btn.secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.pricing-btn.secondary:hover {
  border-color: var(--text-muted);
}

/* ===== CTA ===== */
.cta-section {
  text-align: center;
  padding: 120px 0;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.3;
  pointer-events: none;
}

.cta-section .section-title {
  margin-bottom: 20px;
}

.cta-section .section-desc {
  margin: 0 auto 36px;
}

/* ===== Footer ===== */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--text-secondary);
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== Disclaimer ===== */
.disclaimer {
  padding: 24px 0;
  text-align: center;
}

.disclaimer p {
  font-size: 12px;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  section {
    padding: 60px 0;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 32px;
  }

  .hero-desc {
    margin: 0 auto 28px;
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
    flex-wrap: wrap;
  }

  .hero-image img {
    max-height: none;
    width: 70%;
    max-width: 320px;
    transform: none;
  }

  .hero-image img:hover {
    transform: none;
  }

  .section-desc {
    max-width: 100%;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .showcase-row,
  .showcase-row.reverse {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
    direction: ltr;
  }

  .showcase-image {
    order: -1;
  }

  .showcase-image img {
    width: 70%;
    max-width: 320px;
    margin: 0 auto;
    display: block;
  }

  .showcase-text ul {
    text-align: left;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card {
    padding: 28px;
  }

  .cta-section {
    padding: 80px 0;
  }

  .footer .container {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}