/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #0ea5e9;
  --dark: #0f172a;
  --dark-light: #1e293b;
  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-600: #4b5563;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
  --white: #ffffff;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  --gradient-dark: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 100%);

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--gray-900);
  line-height: 1.6;
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--dark);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--gray-600);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color 0.2s;
}

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

/* Hero Section */
.hero {
  padding: 8rem 0 4rem;
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content {
  max-width: 560px;
}

.badge {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(14, 165, 233, 0.1) 100%);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--dark);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--gray-600);
  margin-bottom: 2rem;
  line-height: 1.7;
}

/* Form Styles */
.hero-form {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-200);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
}

.form-group input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder {
  color: var(--gray-400);
}

.form-note {
  text-align: center;
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-top: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.5);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-large {
  width: 100%;
  padding: 1rem 1.5rem;
  font-size: 1.0625rem;
}

/* Spinner Animation */
.spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Success Message */
.success-message {
  text-align: center;
  padding: 2rem;
}

.success-icon {
  color: var(--success);
  margin-bottom: 1rem;
}

.success-message h3 {
  font-size: 1.5rem;
  color: var(--dark);
  margin-bottom: 0.5rem;
}

.success-message p {
  color: var(--gray-600);
}

/* Hero Visual / Report Preview */
.hero-visual {
  display: flex;
  justify-content: center;
}

.report-preview {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-200);
  width: 100%;
  max-width: 400px;
  transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
  transition: transform 0.3s;
}

.report-preview:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.report-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}

.report-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--primary);
}

.report-domain {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--dark);
}

.report-score {
  text-align: center;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 1.5rem;
}

.score-circle {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
}

.score-number {
  font-size: 4rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.score-max {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--gray-400);
}

.score-label {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-top: 0.5rem;
}

.report-platforms {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.platform-score {
  display: grid;
  grid-template-columns: 80px 1fr 32px;
  align-items: center;
  gap: 0.75rem;
}

.platform-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-700);
}

.platform-bar {
  height: 8px;
  background: var(--gray-200);
  border-radius: 100px;
  overflow: hidden;
}

.platform-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 100px;
  transition: width 1s ease-out;
}

.platform-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--dark);
  text-align: right;
}

/* Stats Section */
.stats {
  padding: 4rem 0;
  background: var(--dark);
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--gray-400);
}

/* How It Works Section */
.how-it-works {
  padding: 6rem 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: 4rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.step {
  text-align: center;
  padding: 2rem;
  position: relative;
}

.step-number {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  color: white;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon {
  width: 72px;
  height: 72px;
  margin: 1.5rem auto 1.5rem;
  background: var(--gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.step h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.75rem;
}

.step p {
  color: var(--gray-600);
  line-height: 1.7;
}

/* Platforms Section */
.platforms {
  padding: 6rem 0;
  background: var(--gray-50);
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.platform-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.platform-logo {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-logo.chatgpt {
  background: #10a37f;
  color: white;
}

.platform-logo.perplexity {
  background: #1a1a1a;
  color: white;
}

.platform-logo.gemini {
  background: #4285f4;
  color: white;
}

.platform-logo.claude {
  background: #d97706;
  color: white;
}

.platform-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.5rem;
}

.platform-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.platform-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
}

.platform-tag.coming-soon {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

/* Report Section */
.report-section {
  padding: 6rem 0;
}

.report-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.report-feature {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  transition: background 0.2s;
}

.report-feature:hover {
  background: var(--gray-100);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--white);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
  box-shadow: var(--shadow);
}

.feature-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.25rem;
}

.feature-content p {
  font-size: 0.9375rem;
  color: var(--gray-600);
}

/* FAQ Section */
.faq {
  padding: 6rem 0;
  background: var(--gray-50);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.faq-item h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.75rem;
}

.faq-item p {
  font-size: 0.9375rem;
  color: var(--gray-600);
  line-height: 1.7;
}

/* CTA Section */
.cta-section {
  padding: 6rem 0;
  background: var(--gradient-dark);
}

.cta-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 1rem;
}

.cta-content p {
  font-size: 1.125rem;
  color: var(--gray-400);
  margin-bottom: 2rem;
}

.cta-content .btn {
  display: inline-flex;
}

/* Footer */
.footer {
  padding: 4rem 0 2rem;
  background: var(--dark);
  color: var(--gray-400);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-brand .logo {
  margin-bottom: 1rem;
}

.footer-brand .logo-text {
  color: var(--white);
}

.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 4rem;
  justify-content: flex-end;
}

.footer-column h4 {
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-column a {
  display: block;
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
  transition: color 0.2s;
}

.footer-column a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-content {
    max-width: 100%;
    text-align: center;
  }

  .hero h1 {
    font-size: 2.75rem;
  }

  .hero-form {
    max-width: 480px;
    margin: 0 auto;
  }

  .hero-visual {
    order: -1;
  }

  .report-preview {
    transform: none;
  }

  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 6rem 0 3rem;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .platforms-grid {
    grid-template-columns: 1fr;
  }

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

  .faq-grid {
    grid-template-columns: 1fr;
  }

  .cta-content h2 {
    font-size: 2rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-links {
    justify-content: flex-start;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.875rem;
  }

  .hero-form {
    padding: 1.5rem;
  }

  .score-number {
    font-size: 3rem;
  }
}