/**
 * CoderFlow Website - Main Styles
 * Built on CoderFlow Brand Guidelines
 */

/* ============================================
   CSS Variables (Brand Tokens)
   ============================================ */
:root {
  /* Primary Colors - Blue and Green Scheme */
  --color-primary-blue: #3b82f6;
  --color-dark-blue: #1e3a8a;
  --color-deep-blue: #1e40af;
  --color-sky-blue: #0ea5e9;
  --color-cyan-accent: #06b6d4;
  --color-emerald-green: #10b981;
  --color-dark-green: #059669;

  /* Neutrals */
  --color-black: #000000;
  --color-cloud-white: #F8FAFC;
  --color-slate-gray: #64748B;
  --color-deep-navy: #1e3a8a;

  /* Legacy aliases for backward compatibility */
  --color-royal-blue: #3b82f6;
  --color-pl-blue: #1e40af;

  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, 'SF Pro Display', 'Segoe UI', sans-serif;
  --font-code: 'JetBrains Mono', Consolas, Monaco, '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;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 900px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-black);
  background-color: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-black);
}

h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-slate-gray);
}

.lead {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--color-slate-gray);
}

.text-center {
  text-align: center;
}

.text-white {
  color: #FFFFFF;
}

.text-slate {
  color: var(--color-slate-gray);
}

/* ============================================
   Links
   ============================================ */
a {
  color: var(--color-primary-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-sky-blue);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-blue) 0%, var(--color-deep-blue) 100%);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-deep-blue) 0%, var(--color-dark-blue) 100%);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--color-emerald-green) 0%, var(--color-dark-green) 100%);
  color: #FFFFFF;
}

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--color-dark-green) 0%, #047857 100%);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

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

.btn-white:hover {
  background: var(--color-cloud-white);
  color: var(--color-deep-blue);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-outline-white {
  background: transparent;
  color: #FFFFFF;
  border: 2px solid #FFFFFF;
}

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

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

/* ============================================
   Layout
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-sm {
  padding: var(--spacing-2xl) 0;
}

/* ============================================
   Header / Navigation
   ============================================ */
.header {
  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 rgba(0, 0, 0, 0.05);
}

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

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 52px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

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

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-black);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  margin-left: var(--spacing-md);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-xs);
  cursor: pointer;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-black);
  margin: 5px 0;
  transition: all var(--transition-base);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding-top: calc(72px + var(--spacing-3xl));
  padding-bottom: var(--spacing-3xl);
  background: linear-gradient(180deg, var(--color-cloud-white) 0%, #FFFFFF 100%);
}

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

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero .lead {
  margin-bottom: var(--spacing-xl);
}

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

/* ============================================
   Feature Grid
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.feature-card {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-primary-blue);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.1);
}

.feature-card h4 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-black);
}

.feature-card p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.feature-card ul {
  list-style: none;
  margin-top: var(--spacing-sm);
}

.feature-card li {
  font-size: 0.875rem;
  color: var(--color-slate-gray);
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.5rem;
}

.feature-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 6px;
  height: 6px;
  background: var(--color-primary-blue);
  border-radius: 50%;
}

/* ============================================
   Comparison Table
   ============================================ */
.comparison-table {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.comparison-col {
  background: #FFFFFF;
  border-radius: 12px;
  padding: var(--spacing-lg);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.comparison-col.highlight {
  border-color: var(--color-primary-blue);
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.05) 0%, #FFFFFF 100%);
}

.comparison-col h4 {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-cloud-white);
}

.comparison-col.highlight h4 {
  color: var(--color-primary-blue);
  border-bottom-color: var(--color-primary-blue);
}

.comparison-col ul {
  list-style: none;
}

.comparison-col li {
  padding: var(--spacing-sm) 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-slate-gray);
  border-bottom: 1px solid var(--color-cloud-white);
}

.comparison-col li:last-child {
  border-bottom: none;
}

.comparison-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.1rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.comparison-col:not(.highlight) li::before {
  background: var(--color-slate-gray);
  opacity: 0.3;
}

.comparison-col.highlight li::before {
  background: var(--color-primary-blue);
}

/* ============================================
   Numbered List (Features)
   ============================================ */
.numbered-list {
  list-style: none;
  counter-reset: feature-counter;
}

.numbered-list li {
  counter-increment: feature-counter;
  position: relative;
  padding-left: 3.5rem;
  margin-bottom: var(--spacing-xl);
}

.numbered-list li::before {
  content: counter(feature-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--color-primary-blue) 0%, var(--color-sky-blue) 100%);
  color: #FFFFFF;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.numbered-list h4 {
  margin-bottom: 0.5rem;
}

.numbered-list p {
  margin-bottom: 0;
}

/* ============================================
   Stats / Callouts
   ============================================ */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-lg);
}

.stat-value {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-blue) 0%, var(--color-emerald-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 1rem;
  color: var(--color-slate-gray);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--color-dark-blue) 0%, var(--color-primary-blue) 100%);
  color: #FFFFFF;
  text-align: center;
}

.cta-section h2 {
  color: #FFFFFF;
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* ============================================
   Video Embed
   ============================================ */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ============================================
   Security / Governance Grid
   ============================================ */
.security-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.security-card {
  background: var(--color-cloud-white);
  border-radius: 12px;
  padding: var(--spacing-lg);
}

.security-card h4 {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.security-card h4::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-primary-blue);
  border-radius: 2px;
}

.security-card p {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* ============================================
   Contact Form
   ============================================ */
.contact-form {
  max-width: 500px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--color-black);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-primary);
  font-size: 1rem;
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: 8px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-deep-navy);
  color: #FFFFFF;
  padding: var(--spacing-2xl) 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
}

.footer-brand {
  max-width: 280px;
}

.footer-brand img {
  height: 32px;
  margin-bottom: var(--spacing-md);
}

.footer-brand p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links h5 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  color: rgba(255, 255, 255, 0.5);
}

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

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   Utility Classes
   ============================================ */
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.bg-white { background: #FFFFFF; }
.bg-cloud { background: var(--color-cloud-white); }
.bg-navy { background: var(--color-deep-navy); }

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary-blue) 0%, var(--color-emerald-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }

  .footer-brand {
    grid-column: 1 / -1;
    max-width: none;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding-top: calc(72px + var(--spacing-2xl));
    padding-bottom: var(--spacing-2xl);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

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

  .comparison-table {
    grid-template-columns: 1fr;
  }

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

  .stats-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }

  .numbered-list li {
    padding-left: 0;
    padding-top: 3.5rem;
  }

  .numbered-list li::before {
    top: 0;
    left: 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .btn {
    width: 100%;
  }

  .btn-lg {
    padding: 1rem 1.5rem;
  }
}

/* ============================================
   Mobile Menu (when active)
   ============================================ */
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: #FFFFFF;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  padding: var(--spacing-lg);
}

.mobile-menu.active {
  display: block;
}

.mobile-menu ul {
  list-style: none;
}

.mobile-menu li {
  margin-bottom: var(--spacing-sm);
}

.mobile-menu a {
  display: block;
  padding: var(--spacing-sm) 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-black);
}

.mobile-menu .btn {
  margin-top: var(--spacing-md);
}

/* ============================================
   Animations (subtle fade-in)
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }

/* ============================================
   Page-Specific: How It Works
   ============================================ */
.workflow-section {
  position: relative;
}

.workflow-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  margin-bottom: var(--spacing-2xl);
}

.workflow-item:nth-child(even) {
  direction: rtl;
}

.workflow-item:nth-child(even) > * {
  direction: ltr;
}

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

.workflow-content p {
  font-size: 1.0625rem;
}

@media (max-width: 768px) {
  .workflow-item,
  .workflow-item:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
  }
}

/* ============================================
   Page-Specific: Pricing
   ============================================ */
.pricing-card {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 16px;
  padding: var(--spacing-xl);
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

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

.pricing-card p {
  font-size: 1.0625rem;
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   Page-Specific: About
   ============================================ */
.about-section {
  background: var(--color-cloud-white);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.about-card {
  background: #FFFFFF;
  border-radius: 12px;
  padding: var(--spacing-xl);
}

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

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

/* ============================================
   Tagline / Highlight Box
   ============================================ */
.highlight-box {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(16, 185, 129, 0.08) 100%);
  border-left: 4px solid var(--color-primary-blue);
  padding: var(--spacing-lg);
  border-radius: 0 12px 12px 0;
  margin: var(--spacing-xl) 0;
}

.highlight-box p {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-black);
  margin-bottom: 0;
}

/* ============================================
   Bullet List (styled)
   ============================================ */
.bullet-list {
  list-style: none;
}

.bullet-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-slate-gray);
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  background: var(--color-primary-blue);
  border-radius: 50%;
}

/* ============================================
   Two Column Layout
   ============================================ */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}