/* PulseTracker - Modern Design System */

:root {
  /* Colors */
  --primary: #0066FF;
  --primary-dark: #0052CC;
  --primary-light: #4D94FF;
  --secondary: #10B981;
  --dark: #0A0E27;
  --dark-alt: #1A1F3A;
  --gray: #6B7280;
  --gray-light: #9CA3AF;
  --gray-lighter: #E5E7EB;
  --white: #FFFFFF;
  --off-white: #F9FAFB;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-narrow {
  max-width: 960px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-lighter);
  z-index: 1000;
  transition: transform var(--transition-base);
}

.navbar.hidden {
  transform: translateY(-100%);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-brand img {
  height: 40px;
  width: auto;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.navbar-menu a {
  color: var(--dark);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.navbar-menu a:hover {
  color: var(--primary);
}

.navbar-cta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  transition: var(--transition-fast);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--dark);
}

.btn-ghost:hover {
  color: var(--primary);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Hero Section */
.hero {
  padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
  background: linear-gradient(135deg, var(--off-white) 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(0, 102, 255, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--gray);
  margin-bottom: var(--spacing-xl);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Section Styles */
.section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-md);
}

.section-header p {
  font-size: 1.125rem;
  color: var(--gray);
}

.section-alt {
  background: var(--off-white);
}

.section-dark {
  background: var(--dark);
  color: var(--white);
}

.section-dark h2,
.section-dark h3 {
  color: var(--white);
}

.section-dark p {
  color: var(--gray-light);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

.card h3 {
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--gray);
  margin-bottom: 0;
}

/* Logo Bar */
.logo-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  opacity: 0.6;
}

.logo-bar img {
  height: 40px;
  width: auto;
  filter: grayscale(100%);
  transition: all var(--transition-base);
}

.logo-bar img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* Testimonials */
.testimonial {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.testimonial-content {
  font-size: 1.125rem;
  font-style: italic;
  margin-bottom: var(--spacing-md);
  color: var(--dark);
}

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

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.testimonial-info h4 {
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.testimonial-info p {
  margin: 0;
  color: var(--gray);
  font-size: 0.875rem;
}

/* Pricing */
.pricing-card {
  background: var(--white);
  border: 2px solid var(--gray-lighter);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.pricing-card:hover {
  border-color: var(--primary);
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.02), rgba(16, 185, 129, 0.02));
  transform: scale(1.05);
}

.pricing-badge {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.pricing-name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.pricing-price {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.pricing-price span {
  font-size: 1.25rem;
  color: var(--gray);
  font-weight: 400;
}

.pricing-description {
  color: var(--gray);
  margin-bottom: var(--spacing-lg);
}

.pricing-features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.pricing-features li {
  padding: var(--spacing-xs) 0;
  color: var(--dark);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.pricing-features li::before {
  content: '✓';
  color: var(--secondary);
  font-weight: 700;
  flex-shrink: 0;
}

/* FAQ */
.faq-item {
  background: var(--white);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--off-white);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--primary);
  transition: transform var(--transition-fast);
}

.faq-question.active::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-answer.active {
  max-height: 500px;
}

.faq-answer-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--gray);
}

/* Blog */
.blog-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

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

.blog-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 3rem;
}

.blog-content {
  padding: var(--spacing-lg);
}

.blog-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--gray);
}

.blog-category {
  color: var(--primary);
  font-weight: 600;
}

.blog-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.blog-excerpt {
  color: var(--gray);
  margin-bottom: var(--spacing-md);
}

.blog-link {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-link:hover {
  gap: 0.75rem;
}

/* Footer */
.footer {
  background: var(--dark);
  color: var(--white);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-section p,
.footer-section a {
  color: var(--gray-light);
}

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

.footer-links li {
  margin-bottom: var(--spacing-xs);
}

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

.footer-bottom {
  border-top: 1px solid var(--dark-alt);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: var(--gray-light);
}

/* Responsive */
@media (max-width: 768px) {
  .navbar-menu {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-lighter);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .navbar-menu.active {
    transform: translateX(0);
  }

  .menu-toggle {
    display: flex;
  }

  .navbar-cta {
    margin-top: var(--spacing-md);
  }

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

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .pricing-card.featured {
    transform: scale(1);
  }
}

/* Utilities */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-gray { color: var(--gray); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mt-lg { margin-top: var(--spacing-lg); }