:root {
  --bg: #ECEFF1;
  --surface: #F8F9FA;
  --cards: #FFFFFF;
  --secondary-surface: #E4E8EB;
  --main-text: #1F2933;
  --muted-text: #5F6874;
  --primary: #4A6272;
  --primary-dark: #34495E;
  --accent: #677D89;
  --green: #5A7665;
  --amber: #A97C40;
  --borders: #AEB8C1;
  --bright-borders: #DCE3E7;
  --hover-border: #C7D1D8;
  --grid-lines: #D8DEE3;
  --shadow-soft: 0 4px 12px rgba(31, 41, 51, 0.04);
  --shadow-hover: 0 8px 24px rgba(31, 41, 51, 0.08);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg);
  color: var(--main-text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  background-image: 
    linear-gradient(to right, var(--grid-lines) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-lines) 1px, transparent 1px);
  background-size: 40px 40px;
  background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--primary-dark);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1.5rem; color: var(--main-text); }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
ul, ol { margin-bottom: 1.5rem; padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }
strong { font-weight: 600; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
.site-header {
  background-color: var(--cards);
  border-bottom: 1px solid var(--bright-borders);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.brand {
  display: inline-block;
  transition: var(--transition);
}

.brand:hover {
  opacity: 0.8;
}

.brand img {
  height: 36px;
  width: auto;
  display: block;
}

.main-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--muted-text);
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-dark);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: var(--cards);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--borders);
  color: var(--primary-dark);
}

.btn-outline:hover {
  border-color: var(--primary-dark);
  background-color: var(--secondary-surface);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--primary-dark);
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 80px 0;
  background-color: var(--surface);
  border-bottom: 1px solid var(--bright-borders);
}

.hero-content {
  max-width: 800px;
}

.hero-subtitle {
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--muted-text);
  margin-bottom: 16px;
  display: block;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-bg {
  background-color: var(--surface);
  border-top: 1px solid var(--bright-borders);
  border-bottom: 1px solid var(--bright-borders);
}

.section-header {
  margin-bottom: 48px;
  max-width: 700px;
}

/* Grid & Cards */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.card {
  background-color: var(--cards);
  border: 1px solid var(--bright-borders);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--hover-border);
  box-shadow: var(--shadow-hover);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--primary-dark);
}

.card-icon {
  width: 48px;
  height: 48px;
  background-color: var(--secondary-surface);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
}

/* Data Maturity Map */
.maturity-map {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: relative;
  gap: 16px;
}

.maturity-map::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--bright-borders);
  z-index: 1;
}

.maturity-step {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 2;
}

.step-number {
  width: 48px;
  height: 48px;
  background-color: var(--cards);
  border: 2px solid var(--borders);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-weight: 600;
  color: var(--primary);
}

.maturity-step h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.maturity-step p {
  font-size: 0.85rem;
  color: var(--muted-text);
}

/* Interactive Service Finder */
.service-finder {
  background-color: var(--cards);
  border: 1px solid var(--borders);
  border-radius: var(--radius-md);
  padding: 40px;
}

.service-select-wrapper {
  margin-bottom: 32px;
}

.service-select {
  width: 100%;
  padding: 16px;
  font-size: 1.1rem;
  border: 1px solid var(--borders);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  color: var(--main-text);
  font-family: var(--font-main);
  appearance: none;
  cursor: pointer;
}

.service-select:focus {
  outline: none;
  border-color: var(--primary);
}

.service-result-card {
  display: none;
  background-color: var(--surface);
  border-left: 4px solid var(--accent);
  padding: 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.service-result-card.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Architecture Diagram (CSS Based) */
.architecture-diagram {
  display: flex;
  flex-direction: column;
  gap: 24px;
  background-color: var(--cards);
  padding: 40px;
  border: 1px solid var(--bright-borders);
  border-radius: var(--radius-md);
}

.arch-row {
  display: flex;
  gap: 24px;
  align-items: center;
}

.arch-node {
  flex: 1;
  background-color: var(--surface);
  border: 1px solid var(--borders);
  padding: 24px;
  text-align: center;
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--primary-dark);
}

.arch-arrow {
  color: var(--muted-text);
  font-size: 1.5rem;
}

/* Forms */
.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--primary-dark);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--borders);
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
  font-size: 1rem;
  background-color: var(--surface);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--cards);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background-color: var(--cards);
  border: 1px solid var(--borders);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-hover);
  z-index: 1000;
  display: none;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.cookie-banner.show {
  display: flex;
}

.cookie-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  background-color: var(--cards);
  border-top: 1px solid var(--borders);
  padding: 64px 0 24px;
  margin-top: 64px;
}

.site-footer .brand img {
  height: 44px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-col h5 {
  font-size: 1rem;
  margin-bottom: 24px;
  color: var(--primary-dark);
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--muted-text);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--bright-borders);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted-text);
}

/* Utilities */
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 32px; }
.tag {
  display: inline-block;
  padding: 4px 8px;
  background-color: var(--secondary-surface);
  color: var(--primary-dark);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  margin-bottom: 16px;
}

/* Knowledge Base Specific */
.kb-article {
  background-color: var(--cards);
  padding: 40px;
  border: 1px solid var(--bright-borders);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
}

.kb-article h3 {
  margin-bottom: 16px;
}

/* Checklists */
.checklist {
  list-style: none;
  padding: 0;
}
.checklist li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 16px;
}
.checklist li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: bold;
}

/* Responsive */
@media (max-width: 1200px) {
  .maturity-map { flex-direction: column; gap: 32px; }
  .maturity-map::before { display: none; }
  .maturity-step { display: flex; text-align: left; align-items: center; gap: 24px; width: 100%; }
  .step-number { margin: 0; flex-shrink: 0; }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .main-nav {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--cards);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--borders);
    box-shadow: var(--shadow-soft);
  }
  .main-nav.show { display: flex; }
  .mobile-menu-toggle { display: block; }
  .arch-row { flex-direction: column; }
  .arch-arrow { transform: rotate(90deg); }
  h1 { font-size: 2rem; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
  .hero { padding: 48px 0; }
  .section { padding: 48px 0; }
  .card { padding: 24px; }
  .cookie-buttons { flex-direction: column; }
  .btn { width: 100%; }
}

/* Accessibility Focus */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}