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

:root {
  --color-primary: #1a1a1a;
  --color-accent: #FF9500;
  --color-accent-blue: #4A9EFF;
  --color-bg: #f5f5f7;
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-card-bg: #fef7ed;
  --color-white: #ffffff;
  --color-border: #e5e5e5;
}

html {
  height: 100%;
  width: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  background-color: var(--color-white);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-text {
  font-weight: 700;
}

.btn-signin {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-signin:hover {
  background-color: #2a2a2a;
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  background-color: var(--color-white);
  padding: 100px 0 120px;
  text-align: center;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.highlight {
  color: var(--color-accent);
}

.highlight-blue {
  color: var(--color-accent-blue);
}

.hero-description {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn-primary:hover {
  background-color: #2a2a2a;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  width: 100%;
  justify-content: center;
}

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

.btn-hero {
  padding: 16px 48px;
  font-size: 16px;
  font-weight: 700;
}

/* Why Use Section */
.why-use {
  padding: 80px 0;
  background-color: var(--color-white);
}

.section-title {
  font-size: 48px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 60px;
  color: var(--color-primary);
}

.features-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.feature-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.feature-number {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  min-width: 24px;
}

.feature-content h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
  display: inline;
}

.feature-content p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  display: inline;
}

/* Features Section */
.features {
  padding: 80px 0;
  background-color: var(--color-bg);
}

.features-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.feature-card-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.feature-card {
  background-color: var(--color-card-bg);
  padding: 32px;
  border-radius: 12px;
  transition: all 0.3s ease;
  border: 1px solid #f5e6d3;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

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

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Pricing Section */
.pricing {
  padding: 80px 0;
  background-color: var(--color-white);
}

.pricing-subtitle {
  text-align: center;
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-top: -40px;
  margin-bottom: 48px;
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background-color: var(--color-white);
  padding: 40px;
  border-radius: 16px;
  border: 2px solid var(--color-border);
  transition: all 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

.pricing-card-premium {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.pricing-card-premium .plan-name,
.pricing-card-premium .plan-description,
.pricing-card-premium .price,
.pricing-card-premium .price-period,
.pricing-card-premium .plan-features li {
  color: var(--color-white);
}

.plan-name {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-description {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.plan-price {
  margin-bottom: 32px;
}

.price {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-primary);
}

.price-period {
  font-size: 16px;
  color: var(--color-text-secondary);
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
}

.plan-features li {
  font-size: 15px;
  padding: 10px 0;
  color: var(--color-text);
  line-height: 1.6;
}

.pricing-card-premium .btn-primary {
  background-color: var(--color-white);
  color: var(--color-primary);
  width: 100%;
  justify-content: center;
}

.pricing-card-premium .btn-primary:hover {
  background-color: var(--color-bg);
}

/* Open Source Section */
.open-source {
  padding: 80px 0;
  background-color: var(--color-bg);
  text-align: center;
}

.open-source-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.6;
}

/* Footer */
.footer {
  background-color: var(--color-white);
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  color: var(--color-text-secondary);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-title {
    font-size: 40px;
  }

  .section-title {
    font-size: 32px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .feature-card-row {
    grid-template-columns: 1fr;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 60px 0 80px;
  }

  .hero-title {
    font-size: 32px;
  }

  .section-title {
    font-size: 28px;
  }

  .container {
    padding: 0 16px;
  }
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  background-color: var(--color-white);
  margin: 10% auto;
  padding: 48px;
  border-radius: 16px;
  max-width: 440px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  position: relative;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-close {
  position: absolute;
  right: 20px;
  top: 20px;
  font-size: 32px;
  font-weight: 300;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.2s ease;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-primary);
}

.modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.modal-header h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
}

.modal-subtitle {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.signup-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.signup-form label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: -8px;
}

.signup-form input[type="email"] {
  padding: 14px 16px;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s ease;
  outline: none;
}

.signup-form input[type="email"]:focus {
  border-color: var(--color-accent);
}

.signup-form input[type="email"]::placeholder {
  color: var(--color-text-secondary);
}

.modal-btn {
  width: 100%;
  justify-content: center;
  margin-top: 8px;
}

.modal-footer {
  margin-top: 24px;
  text-align: center;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.modal-footer a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.modal-footer a:hover {
  text-decoration: underline;
}

/* Success Modal */
.success-modal-content {
  text-align: center;
  padding: 56px 48px;
}

.success-icon {
  margin-bottom: 24px;
  display: flex;
  justify-content: center;
}

.success-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.success-message {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}