/* 🚀 IELTS Helper Landing - Optimized CSS Entry Point */
/* Modular architecture for better performance and maintainability */

/* ═══ FOUNDATION LAYER ═══ */
@import url('_design-tokens.css');
@import url('_reset.css');

/* ═══ COMPONENT LAYER ═══ */
@import url('_components.css');

/* ═══ LANDING-SPECIFIC STYLES ═══ */

/* Navigation System */
.navbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-sidebar);
  background: rgba(26, 27, 30, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: var(--space-sm) 0;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Main Content Layout */
.main-content {
  margin-top: var(--header-height);
}

/* Hero Section */
.hero-section {
  padding: var(--space-2xl) 0;
  background: radial-gradient(ellipse at center, color-mix(in srgb, var(--primary) 10%, transparent) 0%, transparent 50%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: -50% -50% -50% -50%;
  background: radial-gradient(circle, color-mix(in srgb, #8b5cf6 5%, transparent) 0%, transparent 50%);
  animation: rotate 20s linear infinite;
}

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

.hero-section .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

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

.hero-title {
  font: var(--font-weight-bold) clamp(2.5rem, 6vw, 3.5rem)/1.1 var(--font-family);
  color: var(--text);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font: var(--font-weight-normal) clamp(1.1rem, 2.5vw, 1.25rem)/1.6 var(--font-family);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.cta-note {
  font: var(--font-weight-normal) 0.9rem/1 var(--font-family);
  color: var(--text-muted);
  margin: 0;
}

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

.preview-window {
  background: var(--surface-3);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  width: 100%;
  max-width: 500px;
  border: 1px solid var(--border);
}

.preview-header {
  background: var(--surface-4);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
}

.preview-dots {
  display: flex;
  gap: 0.5rem;
}

.preview-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-muted);
}

.preview-dots span:first-child { background: var(--danger); }
.preview-dots span:nth-child(2) { background: var(--warning); }
.preview-dots span:nth-child(3) { background: var(--success); }

.preview-title {
  font: var(--font-weight-semibold) 0.9rem/1 var(--font-family);
  color: var(--text-secondary);
}

.preview-content {
  padding: 1.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.chat-message {
  margin-bottom: 1rem;
}

.chat-message.user .message-content {
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 20%, transparent);
  color: var(--accent);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
}

.chat-message.ai .message-content {
  background: var(--surface-4);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 1rem;
  border-radius: var(--radius-lg);
  font: var(--font-weight-normal) 0.85rem/1.5 var(--font-family);
}

/* Features Section */
.features-section {
  padding: var(--space-2xl) 0;
  background: var(--surface-2);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-title {
  font: var(--font-weight-bold) clamp(2rem, 5vw, 2.5rem)/1 var(--font-family);
  color: var(--text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.section-subtitle {
  font: var(--font-weight-normal) clamp(1.1rem, 2.5vw, 1.2rem)/1 var(--font-family);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.feature-title {
  font: var(--font-weight-semibold) 1.25rem/1 var(--font-family);
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.feature-description {
  color: var(--text-secondary);
  font: var(--font-weight-normal) 1rem/1.6 var(--font-family);
}

/* Testimonials Section */
.testimonials-section {
  padding: var(--space-2xl) 0;
  background: var(--surface-1);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.testimonial-rating {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}

.testimonial-text {
  font: italic var(--font-weight-normal) 1.1rem/1.6 var(--font-family);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font: var(--font-weight-semibold) 1.2rem/1 var(--font-family);
  color: var(--text);
}

.author-name {
  font: var(--font-weight-semibold) 1rem/1 var(--font-family);
  color: var(--text);
}

.author-role {
  font: var(--font-weight-normal) 0.9rem/1 var(--font-family);
  color: var(--text-muted);
}

/* CTA Section */
.cta-section {
  padding: var(--space-2xl) 0;
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, transparent) 0%, color-mix(in srgb, #8b5cf6 10%, transparent) 100%);
  text-align: center;
}

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

.cta-title {
  font: var(--font-weight-bold) clamp(2rem, 5vw, 2.5rem)/1 var(--font-family);
  color: var(--text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.cta-subtitle {
  font: var(--font-weight-normal) clamp(1.1rem, 2.5vw, 1.2rem)/1.6 var(--font-family);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* Footer */
.footer {
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-lg);
}

.footer-title {
  font: var(--font-weight-semibold) 1rem/1 var(--font-family);
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.footer-list {
  list-style: none;
}

.footer-list li {
  margin-bottom: 0.5rem;
}

.footer-list a {
  color: var(--text-muted);
  text-decoration: none;
  font: var(--font-weight-normal) 0.9rem/1 var(--font-family);
  transition: color var(--transition);
}

.footer-list a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: var(--space-lg);
  text-align: center;
}

.footer-text {
  color: var(--text-muted);
  font: var(--font-weight-normal) 0.9rem/1 var(--font-family);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-section .container {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }
  
  .hero-cta {
    align-items: center;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .features-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 var(--space-sm);
  }
  
  .navbar {
    padding: 0.75rem 0;
  }
}

@media (max-width: 480px) {
  .hero-section,
  .features-section,
  .testimonials-section,
  .cta-section {
    padding: var(--space-xl) 0;
  }

  .container {
    padding: 0 var(--space-sm);
  }
}