/* ========================================
   TENKA Landing Page Styles
   Dark premium theme matching dashboard
   ======================================== */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121f;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --accent: #ff4500;
  --accent-glow: rgba(255, 69, 0, 0.3);
  --accent-light: #ff6a33;
  --accent-blue: #4a9eff;
  --accent-green: #00c853;
  --text-primary: #e8e8f0;
  --text-secondary: #8888aa;
  --text-muted: #555577;
  --border: #2a2a44;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

/* ========== ANIMATION ========== */
.feature-card, .problem-card, .step, .plan-card, .faq-item, .stat {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.feature-card.visible, .problem-card.visible, .step.visible,
.plan-card.visible, .faq-item.visible, .stat.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== HEADER ========== */
.lp-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}
.lp-header.scrolled {
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.lp-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), #ff8a00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}
.nav a:hover { color: var(--text-primary); }
.nav-cta {
  background: linear-gradient(135deg, var(--accent), #ff6a00);
  padding: 10px 22px !important;
  border-radius: 8px;
  border: 1px solid transparent;
  color: #fff !important;
  font-weight: 700;
  box-shadow: 0 2px 10px var(--accent-glow);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 18px var(--accent-glow);
  color: #fff !important;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}
.btn-lg {
  padding: 18px 40px;
  font-size: 1.1rem;
  border-radius: 14px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #ff6a00);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent-blue);
  background: var(--bg-card-hover);
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
  width: 100%;
  justify-content: center;
}
.btn-outline:hover {
  border-color: var(--accent);
  background: rgba(255, 69, 0, 0.08);
}
.btn-icon { font-size: 1.2em; }

/* ========== HERO ========== */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.4;
  pointer-events: none;
}
.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  border-radius: 50px;
  background: rgba(255, 69, 0, 0.12);
  border: 1px solid rgba(255, 69, 0, 0.3);
  color: var(--accent-light);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 28px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 24px;
}
.accent {
  background: linear-gradient(135deg, var(--accent), #ff8a00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========== SECTION COMMON ========== */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900;
  text-align: center;
  margin-bottom: 16px;
}
.section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-size: 1.05rem;
}

/* ========== PROBLEM ========== */
.problem {
  padding: 100px 0;
  background: var(--bg-secondary);
}
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
}
.problem-icon { font-size: 2.5rem; margin-bottom: 16px; }
.problem-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.problem-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* ========== SOLUTION ========== */
.solution {
  padding: 100px 0 40px;
}
.solution-header { text-align: center; }

/* ========== FEATURES ========== */
.features {
  padding: 40px 0 100px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  transition: all var(--transition);
}
.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(255, 69, 0, 0.1);
}
.feature-num {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 3rem;
  font-weight: 900;
  color: var(--bg-card-hover);
  line-height: 1;
}
.feature-icon { font-size: 2.2rem; margin-bottom: 16px; }
.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ========== HOW IT WORKS ========== */
.how-it-works {
  padding: 100px 0;
  background: var(--bg-secondary);
}
.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  flex: 1;
  min-width: 220px;
  max-width: 300px;
}
.step-num {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--accent), #ff6a00);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 20px;
}
.step h3 { margin-bottom: 10px; font-size: 1.1rem; }
.step p { color: var(--text-secondary); font-size: 0.9rem; }
.step-arrow {
  font-size: 1.8rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ========== STATS ========== */
.stats {
  padding: 80px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat {
  text-align: center;
  padding: 32px 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.stat-num {
  font-size: 2.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), #ff8a00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* ========== PRICING ========== */
.pricing {
  padding: 100px 0;
  background: var(--bg-secondary);
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  align-items: start;
}
.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  position: relative;
}
.plan-popular {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
  transform: scale(1.03);
}
.plan-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent), #ff6a00);
  color: #fff;
  padding: 4px 24px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
}
.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-secondary);
}
.plan-popular .plan-name { color: var(--accent-light); }
.plan-price { margin-bottom: 28px; }
.price-amount {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-primary);
}
.price-unit {
  font-size: 1rem;
  color: var(--text-secondary);
}
.plan-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}
.plan-features li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  font-size: 0.92rem;
}
.plan-features li::before {
  content: '✓ ';
  color: var(--accent-green);
  font-weight: 700;
}

/* ========== FAQ ========== */
.faq {
  padding: 100px 0;
}
.faq-list {
  max-width: 700px;
  margin: 48px auto 0;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-item summary {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 700;
  font-size: 1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent);
  transition: transform var(--transition);
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item p {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ========== FINAL CTA ========== */
.final-cta {
  padding: 100px 0;
  text-align: center;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}
.final-cta::before {
  content: '';
  position: absolute;
  bottom: -30%;
  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;
}
.final-cta h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 16px;
  line-height: 1.4;
}
.final-cta p {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.05rem;
}

/* ========== FOOTER ========== */
.lp-footer {
  padding: 60px 0 32px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p {
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 0.9rem;
}
.footer-links h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.footer-links a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .nav { gap: 16px; }
  .nav a:not(.nav-cta) { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .btn-lg { width: 100%; max-width: 340px; justify-content: center; }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: 1fr; }
  .plan-popular { transform: scale(1); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .feature-grid { grid-template-columns: 1fr; }
}