:root {
  --bg: #0a0a0f;
  --bg-subtle: #12121a;
  --bg-card: #16161f;
  --fg: #e8e6e3;
  --fg-muted: #8a8a99;
  --fg-dim: #5a5a6a;
  --accent: #c4a35a;
  --accent-soft: rgba(196, 163, 90, 0.12);
  --accent-border: rgba(196, 163, 90, 0.25);
  --red-muted: #6b3a3a;
  --green-soft: rgba(90, 196, 130, 0.12);
  --green: #5ac482;
  --radius: 12px;
  --radius-sm: 8px;
  --font-jp: 'Noto Sans JP', sans-serif;
  --font-en: 'Space Grotesk', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-jp);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- HERO ---- */
.hero {
  position: relative;
  padding: 140px 0 100px;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(196, 163, 90, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 163, 90, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 0%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 0%, black 20%, transparent 70%);
}

.hero .container { position: relative; z-index: 1; }

.hero-badge {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  line-height: 1.9;
  max-width: 480px;
  margin-bottom: 56px;
}

.hero-stat-row {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--fg-dim);
}

.hero-stat-divider {
  width: 1px;
  height: 40px;
  background: var(--fg-dim);
  opacity: 0.3;
}

/* ---- PROBLEM ---- */
.problem {
  padding: 100px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.problem-text h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 20px;
}

.problem-text p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-bottom: 14px;
  line-height: 1.85;
}

.problem-text p:last-child {
  color: var(--fg);
  font-weight: 500;
}

.comparison-card {
  padding: 24px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.comparison-card.old {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
}

.comparison-card.new {
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
}

.comparison-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--fg-dim);
  margin-bottom: 14px;
}

.comparison-card.new .comparison-label {
  color: var(--accent);
}

.comparison-flow {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  color: var(--fg-muted);
}

.comparison-card.new .comparison-flow {
  color: var(--fg);
}

.flow-arrow {
  color: var(--fg-dim);
  font-family: var(--font-en);
}

.comparison-card.new .flow-arrow {
  color: var(--accent);
}

/* ---- FEATURES ---- */
.features {
  padding: 100px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.features h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 56px;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--accent-border);
}

.feature-number {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.5;
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--fg-muted);
  line-height: 1.85;
}

/* ---- CLOSING ---- */
.closing {
  padding: 120px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
  text-align: center;
}

.closing-content {
  max-width: 600px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.closing-text {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 2;
  margin-bottom: 32px;
}

.closing-tagline {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.5px;
}

/* ---- FOOTER ---- */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
}

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

.footer-brand {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 1rem;
  color: var(--fg);
}

.footer-text {
  font-size: 0.8rem;
  color: var(--fg-dim);
  font-family: var(--font-en);
}

/* ---- MOBILE ---- */
@media (max-width: 768px) {
  .hero { padding: 100px 0 70px; }

  .hero-stat-row {
    gap: 20px;
  }

  .hero-stat-divider { display: none; }

  .stat-num { font-size: 1.5rem; }

  .problem-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card { padding: 28px 22px; }

  .closing { padding: 80px 0; }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .mobile-break { display: block; }
}

@media (min-width: 769px) {
  .mobile-break { display: none; }
}