* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: #f5f7fa;
  color: #1f2937;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #10b981 0%, #06b6d4 60%, #3b82f6 100%);
  color: white;
  padding: 60px 0 70px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
  pointer-events: none;
}
.logo {
  font-size: 56px;
  margin-bottom: 16px;
  display: inline-block;
  background: rgba(255,255,255,0.2);
  width: 88px;
  height: 88px;
  line-height: 88px;
  border-radius: 22px;
  backdrop-filter: blur(8px);
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 12px;
  position: relative;
  z-index: 1;
}
.tagline {
  font-size: 16px;
  margin: 0 0 32px;
  opacity: 0.95;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}
.tagline b {
  background: rgba(255,255,255,0.2);
  padding: 1px 8px;
  border-radius: 4px;
  margin: 0 2px;
  font-weight: 500;
}
.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 12px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s;
  cursor: pointer;
  border: none;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: white;
  color: #10b981;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}
.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}
.btn-ghost {
  background: rgba(255,255,255,0.15);
  color: white;
  border: 1px solid rgba(255,255,255,0.4);
  backdrop-filter: blur(4px);
}
.btn-lg {
  padding: 18px 40px;
  font-size: 18px;
}
.hero-meta {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  opacity: 0.9;
  position: relative;
  z-index: 1;
}

/* Sections */
.section {
  padding: 56px 0;
}
.section-alt {
  background: white;
}
.section h2 {
  font-size: 24px;
  text-align: center;
  margin: 0 0 36px;
  color: #1f2937;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.feature {
  background: white;
  border-radius: 14px;
  padding: 24px 20px;
  border: 1px solid #f0f0f0;
  transition: transform 0.2s, box-shadow 0.2s;
}
.section-alt .feature {
  background: #f9fafb;
  border-color: #f3f4f6;
}
.feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.feature-icon {
  font-size: 36px;
  margin-bottom: 12px;
}
.feature h3 {
  font-size: 17px;
  margin: 0 0 8px;
  color: #1f2937;
}
.feature p {
  font-size: 14px;
  color: #6b7280;
  margin: 0;
  line-height: 1.6;
}

/* Steps */
.steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 720px;
  margin: 0 auto;
}
.step {
  display: flex;
  gap: 16px;
  background: #f9fafb;
  padding: 20px;
  border-radius: 14px;
  border-left: 4px solid #10b981;
}
.step-num {
  width: 36px;
  height: 36px;
  background: #10b981;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  flex-shrink: 0;
}
.step-body { flex: 1; }
.step-body h3 {
  margin: 4px 0 8px;
  font-size: 16px;
}
.step-body p {
  margin: 0 0 8px;
  font-size: 14px;
  color: #4b5563;
}
.ai-steps {
  font-size: 14px;
  color: #4b5563;
  padding-left: 20px;
  margin: 8px 0;
}
.ai-steps li {
  margin: 4px 0;
}
.ai-steps a {
  color: #10b981;
  font-weight: 500;
}
.tip {
  background: #fef3c7;
  color: #92400e;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  margin-top: 8px !important;
}

/* Privacy */
.privacy-block h2 { margin-bottom: 24px; }
.privacy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}
.privacy-item {
  display: flex;
  gap: 12px;
  padding: 16px;
  border-radius: 12px;
  background: white;
  border: 1px solid #f0f0f0;
}
.privacy-item.good { border-left: 4px solid #10b981; }
.privacy-item.warn { border-left: 4px solid #f59e0b; }
.pi-icon {
  font-size: 24px;
  flex-shrink: 0;
}
.privacy-item h4 {
  margin: 0 0 4px;
  font-size: 15px;
}
.privacy-item p {
  margin: 0;
  font-size: 13px;
  color: #6b7280;
}

/* FAQ */
.faq {
  background: white;
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 8px;
  border: 1px solid #f0f0f0;
  cursor: pointer;
}
.faq summary {
  font-weight: 600;
  font-size: 15px;
  color: #1f2937;
  outline: none;
  padding: 4px 0;
  list-style: none;
  position: relative;
  padding-right: 28px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 4px;
  font-size: 20px;
  color: #10b981;
  transition: transform 0.2s;
}
.faq[open] summary::after {
  transform: rotate(45deg);
}
.faq p {
  margin: 12px 0 4px;
  font-size: 14px;
  color: #6b7280;
  line-height: 1.6;
}

/* Final CTA */
.final-cta {
  background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
  color: white;
  padding: 64px 0;
  text-align: center;
}
.final-cta h2 {
  font-size: 28px;
  margin: 0 0 12px;
}
.final-cta p {
  font-size: 16px;
  opacity: 0.85;
  margin: 0 0 28px;
}
.cta-hint {
  font-size: 12px !important;
  opacity: 0.6 !important;
  margin-top: 16px !important;
}

/* Footer */
.footer {
  background: #111827;
  color: #9ca3af;
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
}

/* Mobile */
@media (max-width: 600px) {
  .hero { padding: 48px 0 56px; }
  .hero h1 { font-size: 26px; }
  .tagline { font-size: 14px; }
  .section { padding: 40px 0; }
  .section h2 { font-size: 22px; margin-bottom: 28px; }
  .btn { padding: 12px 24px; font-size: 15px; }
  .btn-lg { padding: 16px 32px; font-size: 16px; }
  .features-grid { grid-template-columns: 1fr; }
  .privacy-grid { grid-template-columns: 1fr; }
  .step { padding: 16px; }
}