/* ============================================
   BASELINE TECHNOLOGY GROUP - Design System
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-primary: #1B2A4A;
  --color-secondary: #2563EB;
  --color-accent: #10B981;
  --color-accent-hover: #059669;
  --color-white: #FFFFFF;
  --color-bg-light: #162033;
  --color-bg-dark: #0F172A;
  --color-text: #E2E8F0;
  --color-text-secondary: #94A3B8;
  --color-text-light: #64748B;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-card-shadow: rgba(0, 0, 0, 0.3);
  --color-hero-overlay: rgba(15, 23, 42, 0.85);
  --color-surface: #1B2A4A;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.25rem;
  --line-height: 1.6;
  --line-height-tight: 1.2;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

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

h1 {
  font-size: var(--font-size-5xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--space-sm);
}

.text-secondary {
  color: var(--color-text-secondary);
}

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

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

.section-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: var(--space-xl);
}

.section-subtitle.centered {
  margin-left: auto;
  margin-right: auto;
}

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

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

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

section.bg-light {
  background-color: var(--color-bg-light);
}

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

section.bg-dark h2,
section.bg-dark h3,
section.bg-dark h4 {
  color: var(--color-white);
}

section.bg-dark .section-subtitle {
  color: var(--color-text-light);
}

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

section.bg-primary h2,
section.bg-primary h3,
section.bg-primary h4 {
  color: var(--color-white);
}

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

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--color-bg-dark);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.nav.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

.nav-logo img {
  height: 36px;
  width: auto;
}

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

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s ease;
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: all 0.3s ease;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.75rem;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--border-radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

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

.btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

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

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: var(--font-size-base);
}

.btn-nav {
  padding: 0.5rem 1.25rem;
}

/* --- Cards --- */
.card {
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px var(--color-card-shadow), 0 4px 16px var(--color-card-shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-card-shadow), 0 8px 32px var(--color-card-shadow);
}

.card-icon {
  width: 48px;
  height: 48px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.card-icon.accent {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-accent);
}

.card h3 {
  margin-bottom: var(--space-xs);
}

.card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* --- Hero --- */
.hero {
  padding: calc(var(--nav-height) + var(--space-4xl)) 0 var(--space-4xl);
  background-color: var(--color-bg-dark);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: -20%;
  width: 60%;
  height: 100%;
  background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  max-width: 700px;
}

.hero .lead {
  font-size: var(--font-size-xl);
  color: var(--color-text-light);
  max-width: 580px;
  margin-bottom: var(--space-xl);
  line-height: 1.5;
}

.hero-buttons {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* --- Comparison Table --- */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-surface);
}

.comparison-table td:first-child {
  font-weight: 500;
  color: var(--color-white);
}

.comparison-table .highlight {
  background-color: rgba(16, 185, 129, 0.05);
}

.comparison-table .check {
  color: var(--color-accent);
  font-weight: 700;
}

.comparison-table .x {
  color: var(--color-text-light);
}

/* --- Steps --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(to right, var(--color-accent), var(--color-secondary));
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
}

.step h3 {
  margin-bottom: var(--space-xs);
}

.step p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* --- Stats Bar --- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* --- Industry Grid --- */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.industry-item {
  text-align: center;
  padding: var(--space-lg);
}

.industry-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.industry-item h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
}

.industry-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding: var(--space-4xl) 0;
}

.cta-section h2 {
  margin-bottom: var(--space-md);
}

.cta-section p {
  margin-bottom: var(--space-xl);
}

/* --- Service Detail --- */
.service-section {
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.service-section:last-of-type {
  border-bottom: none;
}

.service-header {
  margin-bottom: var(--space-xl);
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

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

.deliverables-list li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
  color: var(--color-text-secondary);
}

.deliverables-list li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* --- Pricing Table --- */
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: var(--font-size-sm);
}

.pricing-table th,
.pricing-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.pricing-table th {
  font-weight: 600;
  background-color: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.pricing-table td {
  font-variant-numeric: tabular-nums;
}

.pricing-table .price {
  font-weight: 600;
  color: var(--color-white);
}

/* --- FAQ --- */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.faq-question {
  font-weight: 600;
  color: var(--color-white);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
}

.faq-question::after {
  content: '+';
  font-size: var(--font-size-xl);
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--color-text-secondary);
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding-top: var(--space-sm);
}

/* --- Forms --- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* --- Footer --- */
.footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--space-3xl) 0 var(--space-lg);
}

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

/* Trust Badges */
.trust-badges {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.trust-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  text-align: center;
}

.trust-badge-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-surface);
}

.trust-badge span {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-brand {
  margin-bottom: var(--space-sm);
}

.footer-brand img {
  height: 36px;
  width: auto;
}

.footer-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  max-width: 320px;
}

.footer h4 {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  transition: color 0.2s ease;
}

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

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root {
    --space-3xl: 4rem;
    --space-4xl: 5rem;
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }

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

  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .steps::before { display: none; }

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

  .hero {
    padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-2xl);
  }

  /* Mobile nav */
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    flex-direction: column;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

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

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

  .comparison-table {
    font-size: var(--font-size-sm);
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .comparison-table th,
  .comparison-table td {
    padding: var(--space-xs);
  }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-sm); }
  .stats { grid-template-columns: 1fr 1fr; }
  .industry-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }