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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

a {
  color: inherit;
  text-decoration: none;
}

.dark {
  background: #0a0a0a;
  color: #f5f5f5;
}
.dark .nav {
  background: rgba(10, 10, 10, 0.8);
  border-bottom-color: #1a1a1a;
}
.dark .nav-links a {
  color: #888;
}
.dark .nav-links a:hover {
  color: #f5f5f5;
}
.dark .hero-sub, .dark .feature-desc, .dark .feature-bullets li, .dark .why-item p, .dark .waitlist-sub, .dark .footer {
  color: #888;
}
.dark .feature-row {
  border-bottom-color: #1a1a1a;
}
.dark .feature-icon svg {
  color: #6366f1;
}
.dark .input-email {
  background: #111;
  color: #f5f5f5;
  border-color: #333;
}
.dark .input-email:focus {
  border-color: #6366f1;
}
.dark .btn-secondary {
  color: #f5f5f5;
  border-color: #333;
}
.dark .btn-secondary:hover {
  border-color: #6366f1;
}
.dark .footer {
  border-top-color: #1a1a1a;
}

.light {
  background: #fafafa;
  color: #111;
}
.light .nav {
  background: rgba(250, 250, 250, 0.8);
  border-bottom-color: #e5e5e5;
}
.light .nav-links a {
  color: #666;
}
.light .nav-links a:hover {
  color: #111;
}
.light .hero-sub, .light .feature-desc, .light .feature-bullets li, .light .why-item p, .light .waitlist-sub, .light .footer {
  color: #666;
}
.light .feature-row {
  border-bottom-color: #e5e5e5;
}
.light .feature-icon svg {
  color: #6366f1;
}
.light .input-email {
  background: #fff;
  color: #111;
  border-color: #ccc;
}
.light .input-email:focus {
  border-color: #6366f1;
}
.light .btn-secondary {
  color: #111;
  border-color: #ccc;
}
.light .btn-secondary:hover {
  border-color: #6366f1;
}
.light .footer {
  border-top-color: #e5e5e5;
}
.light .highlight {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: blur(12px);
  border-bottom: 1px solid;
  transition: background 0.3s, border-color 0.3s;
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.dot {
  color: #6366f1;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}
.nav-links a {
  font-size: 0.9rem;
  transition: color 0.2s;
}

.theme-toggle {
  background: none;
  border: none;
  padding: 0.25rem;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.4;
  transition: opacity 0.2s;
  color: inherit;
}
.theme-toggle:hover {
  opacity: 0.8;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.hero-content {
  text-align: center;
  max-width: 720px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.highlight {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.15rem;
  margin-top: 1.5rem;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-block;
}

.btn-primary {
  background: #6366f1;
  color: #fff;
  border: none;
}
.btn-primary:hover {
  background: #4f46e5;
}

.btn-secondary {
  background: transparent;
  transition: border-color 0.2s, color 0.2s;
  border: 1px solid;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 3rem;
}

.features {
  padding: 4rem 2rem 3rem;
  max-width: 760px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card-last {
    width: 100%;
  }
}
.feature-card {
  padding: 1.75rem 1.5rem;
  border-radius: 14px;
  text-align: center;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%) scale(0.6);
  width: 140px;
  height: 140px;
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
  z-index: 0;
  filter: blur(20px);
}

.dark .feature-card::before {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.35) 0%, transparent 70%);
}

.light .feature-card::before {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
}

.feature-card:hover::before {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

.feature-card:hover {
  transform: translateY(-4px);
}

.feature-card-last {
  grid-column: 1/-1;
  justify-self: center;
  width: 50%;
}

.dark .feature-card:hover {
  background: rgba(17, 17, 17, 0.4);
  box-shadow: 0 8px 40px rgba(99, 102, 241, 0.08);
}

.light .feature-card:hover {
  background: rgba(255, 255, 255, 0.5);
  box-shadow: 0 8px 40px rgba(99, 102, 241, 0.06);
}

.feature-card-icon {
  position: relative;
  z-index: 1;
  margin-bottom: 0.75rem;
  line-height: 0;
}

.dark .feature-card-icon svg {
  color: #6366f1;
}

.light .feature-card-icon svg {
  color: #6366f1;
}

.feature-card-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.feature-card-body p {
  font-size: 0.85rem;
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.dark .feature-card-body p {
  color: #888;
}

.light .feature-card-body p {
  color: #666;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: center;
}

.feature-tags span {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.dark .feature-tags span {
  background: #1a1a1a;
  color: #999;
  border: 1px solid #2a2a2a;
}

.light .feature-tags span {
  background: #f5f5f7;
  color: #555;
  border: 1px solid #eee;
}

.why {
  padding: 6rem 2rem;
  max-width: 760px;
  margin: 0 auto;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
}

@media (max-width: 640px) {
  .why-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}
.why-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.why-icon {
  flex-shrink: 0;
  padding-top: 0.25rem;
  line-height: 0;
}

.dark .why-icon svg {
  color: #6366f1;
}

.light .why-icon svg {
  color: #6366f1;
}

.why-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.why-item p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.dark .why-item p {
  color: #888;
}

.light .why-item p {
  color: #666;
}

.cta {
  text-align: center;
  padding: 6rem 2rem;
}

.cta-sub {
  margin-bottom: 2rem;
}

.dark .cta-sub {
  color: #888;
}

.light .cta-sub {
  color: #666;
}

.cta-form {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.input-email {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  width: 300px;
  outline: none;
  border: 1px solid;
  transition: border-color 0.2s, background 0.3s, color 0.3s;
}
.input-email:focus {
  border-color: #6366f1;
}

.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  border-top: 1px solid;
  transition: border-color 0.3s, color 0.3s;
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-sub {
    font-size: 1rem;
  }
  .features {
    padding: 3rem 1.5rem 2rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card-last {
    width: 100%;
  }
  .why {
    padding: 4rem 1.5rem;
  }
  .why-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .cta {
    padding: 4rem 1.5rem;
  }
  .input-email {
    width: 100%;
  }
}