:root {
  --bg: #0f0f17;
  --bg-soft: #161622;
  --card: #1c1c2e;
  --text: #f4f4fa;
  --text-dim: #a0a0b8;
  --accent: #7c5cff;
  --accent-soft: #9c7cff;
  --success: #50c878;
  --danger: #ff5c7a;
  --border: rgba(255, 255, 255, 0.08);
  --max-w: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== NAV ===== */
.nav {
  position: sticky;
  top: 0;
  background: rgba(15, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
}
.btn[hidden] {
  display: none;
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-soft);
  border-color: var(--text-dim);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

/* ===== HERO ===== */
.hero {
  padding: 80px 24px 100px;
  text-align: center;
  background: radial-gradient(ellipse at top, rgba(124, 92, 255, 0.12), transparent 60%);
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
}

.eyebrow {
  font-size: 14px;
  color: var(--accent-soft);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-title .accent {
  background: linear-gradient(120deg, var(--accent), var(--accent-soft));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-note {
  font-size: 13px;
  color: var(--text-dim);
}

/* ===== SECTIONS ===== */
.section {
  padding: 80px 24px;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  text-align: center;
  font-size: 17px;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto 60px;
}

/* ===== FEATURES ===== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 28px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature:hover {
  transform: translateY(-4px);
  border-color: rgba(124, 92, 255, 0.4);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature p {
  color: var(--text-dim);
  font-size: 15px;
  margin-bottom: 12px;
}

.feature-source {
  font-size: 13px !important;
  color: var(--accent-soft) !important;
  font-style: italic;
}

/* ===== PROBLEM ===== */
.problem {
  background: var(--bg-soft);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.problem-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.problem-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--danger);
}

.problem-item p {
  font-size: 14px;
  color: var(--text-dim);
}

.problem-cta {
  text-align: center;
  font-size: 18px;
  color: var(--text);
  max-width: 700px;
  margin: 0 auto;
}

.problem-cta strong {
  color: var(--accent-soft);
}

/* ===== PRICING ===== */
.pricing {
  background: radial-gradient(ellipse at center, rgba(124, 92, 255, 0.06), transparent 60%);
}

.pricing-card {
  max-width: 480px;
  margin: 0 auto;
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: 20px;
  padding: 40px 36px;
  text-align: center;
  position: relative;
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--success);
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
}

.pricing-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

.pricing-price {
  margin-bottom: 8px;
}

.price {
  font-size: 56px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
}

.price-period {
  font-size: 18px;
  color: var(--text-dim);
  font-weight: 500;
}

.pricing-alt {
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 28px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  color: var(--text-dim);
  font-size: 15px;
  border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-foot {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 16px;
}

/* ===== FAQ ===== */
.faq {
  max-width: 720px;
  margin: 0 auto;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.faq details:hover {
  border-color: rgba(124, 92, 255, 0.3);
}

.faq summary {
  font-weight: 600;
  font-size: 16px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  font-size: 24px;
  color: var(--accent);
  font-weight: 300;
  transition: transform 0.2s;
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq details p {
  margin-top: 16px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.7;
}

.faq details a {
  color: var(--accent-soft);
}

/* ===== CTA SECTION ===== */
.cta {
  text-align: center;
  background: radial-gradient(ellipse at center, rgba(124, 92, 255, 0.15), transparent 60%);
}

.cta h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta p {
  color: var(--text-dim);
  font-size: 17px;
  margin-bottom: 32px;
}

.cta-note {
  margin-top: 16px;
  font-size: 13px;
}

.cta-note a {
  color: var(--accent-soft);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: 60px 24px 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-tag {
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 8px;
}

.footer h4 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text);
  margin-bottom: 16px;
}

.footer-grid a {
  display: block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 4px 0;
  transition: color 0.2s;
}

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

.footer-copy {
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links {
    gap: 16px;
  }

  .nav-links a:not(.btn) {
    display: none;
  }

  .hero {
    padding: 60px 24px 80px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

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