/* MBUpdates.com — Main Stylesheet
   Mercedes-Benz Official Color Theme
   Primary: #00ADEF (Cyan) | Dark: #1a1a1a | Light: #f5f5f5
*/

/* ===== CSS Variables ===== */
:root {
  --color-primary: #00ADEF;
  --color-primary-dark: #0095cc;
  --color-black: #000000;
  --color-silver: #C0C0C0;
  --color-dark: #1a1a1a;
  --color-charcoal: #2d2d2d;
  --color-body: #333333;
  --color-heading: #111111;
  --color-light: #f5f5f5;
  --color-white: #ffffff;
  --color-border: #e0e0e0;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-primary: 0 4px 14px rgba(0,173,239,0.3);

  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease-out;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-family);
  color: var(--color-body);
  line-height: 1.6;
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }

/* ===== Icon System ===== */
.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: middle;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-lg { width: 1.5em; height: 1.5em; }
.icon-xl { width: 2em; height: 2em; }
.icon-2xl { width: 2.5em; height: 2.5em; }
.icon-primary { color: var(--color-primary); }
.icon-dark { color: var(--color-dark); }
.icon-white { color: var(--color-white); }
.flag-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  background: var(--color-light);
  color: var(--color-body);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  vertical-align: middle;
}

/* ===== Internal Link Components ===== */
.link-list { list-style: none; }
.link-list li { margin-bottom: var(--space-sm); }
.link-list li a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-body);
  font-weight: 500;
  transition: color var(--transition-fast);
}
.link-list li a::before {
  content: "→";
  color: var(--color-primary);
  font-weight: 700;
  transition: transform var(--transition-fast);
}
.link-list li a:hover {
  color: var(--color-primary);
}
.link-list li a:hover::before {
  transform: translateX(3px);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}
h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); font-weight: 600; }
h4 { font-size: 1.25rem; font-weight: 600; }
p { margin-bottom: var(--space-md); }
.lead { font-size: 1.125rem; color: var(--color-body); }
.small { font-size: 0.875rem; }
.tiny { font-size: 0.75rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; }

/* ===== Layout ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
.section {
  padding: var(--space-3xl) 0;
}
.section-dark {
  background: var(--color-dark);
  color: var(--color-white);
}
.section-dark h1, .section-dark h2, .section-dark h3 {
  color: var(--color-white);
}
.section-light {
  background: var(--color-light);
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: var(--space-xl);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  color: var(--color-white);
}
.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
}
.btn-dark:hover {
  background: var(--color-charcoal);
  color: var(--color-white);
}
.btn-sm { padding: 0.625rem 1.25rem; font-size: 0.875rem; }
.btn-lg { padding: 1rem 2.25rem; font-size: 1.125rem; }

/* ===== Cards ===== */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.card-dark {
  background: var(--color-charcoal);
  border-color: #404040;
  color: var(--color-white);
}
.card-dark:hover {
  border-color: var(--color-primary);
}
.card-dark h3, .card-dark h4 {
  color: var(--color-white);
}
.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  display: block;
}

/* ===== Navigation ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: -0.02em;
}
.logo span { color: var(--color-primary); }
.nav-links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}
.nav-links a {
  color: var(--color-body);
  font-weight: 500;
  font-size: 0.9375rem;
  position: relative;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--color-primary);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}
.nav-cta {
  background: var(--color-primary);
  color: var(--color-white) !important;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
}
.nav-cta:hover {
  background: var(--color-primary-dark);
  color: var(--color-white) !important;
}
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 1024px) {
  .nav-links { display: none; position: absolute; top: 4rem; left: 0; right: 0; background: var(--color-white); flex-direction: column; padding: var(--space-lg); border-bottom: 1px solid var(--color-border); gap: var(--space-md); }
  .nav-links.open { display: flex; }
  .mobile-toggle { display: block; }
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-charcoal) 100%);
  color: var(--color-white);
  padding: var(--space-4xl) 0 var(--space-3xl);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(0,173,239,0.03) 10px,
    rgba(0,173,239,0.03) 20px
  );
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  color: var(--color-white);
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  margin-bottom: var(--space-lg);
  max-width: 800px;
}
.hero h1 span { color: var(--color-primary); }
.hero .lead {
  color: var(--color-silver);
  font-size: 1.25rem;
  max-width: 600px;
  margin-bottom: var(--space-xl);
}
.hero-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}
.hero-stats {
  display: flex;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat .number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  display: block;
  line-height: 1;
}
.hero-stat .label {
  font-size: 0.875rem;
  color: var(--color-silver);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-sm);
}

/* ===== Trust Bar ===== */
.trust-bar {
  background: var(--color-light);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}
.trust-items {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-body);
}
.trust-item .icon {
  font-size: 1.5rem;
}

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}
.section-header h2 {
  margin-bottom: var(--space-md);
}
.section-header p {
  color: #666;
  font-size: 1.125rem;
}
.section-header .tiny {
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  display: block;
}

/* ===== Feature List ===== */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: 0.9375rem;
}
.feature-list .check {
  color: var(--color-success);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===== Pricing Tag ===== */
.price-tag {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-xs);
}
.price-tag .currency { font-size: 1rem; font-weight: 600; color: var(--color-primary); }
.price-tag .amount { font-size: 2rem; font-weight: 800; color: var(--color-primary); line-height: 1; }
.price-tag .period { font-size: 0.875rem; color: #666; }
.price-tag .old-price { font-size: 1rem; color: #999; text-decoration: line-through; margin-right: var(--space-sm); }

/* ===== Badge ===== */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.badge-primary { background: rgba(0,173,239,0.1); color: var(--color-primary); }
.badge-success { background: rgba(16,185,129,0.1); color: var(--color-success); }
.badge-warning { background: rgba(245,158,11,0.1); color: var(--color-warning); }

/* ===== Footer ===== */
.footer {
  background: var(--color-dark);
  color: #a0a0a0;
  padding: var(--space-3xl) 0 var(--space-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}
.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  display: inline-block;
}
.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}
.footer-column h4 {
  color: var(--color-white);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}
.footer-column ul { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-column a {
  color: #a0a0a0;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}
.footer-column a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid #333;
  padding-top: var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.875rem;
}
.footer-bottom a { color: #a0a0a0; }

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: #666;
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}
.breadcrumb a { color: #666; }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { color: #ccc; }
.breadcrumb .current { color: var(--color-heading); font-weight: 500; }

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}
.faq-item summary {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--color-primary);
  font-weight: 300;
}
.faq-item[open] summary::after { content: '−'; }
.faq-item p {
  margin-top: var(--space-md);
  color: #555;
  padding-right: 2rem;
}

/* ===== Contact Form ===== */
.form-group {
  margin-bottom: var(--space-lg);
}
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-heading);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-body);
  background: var(--color-white);
  transition: border-color var(--transition-fast);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,173,239,0.1);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
th, td {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
th {
  font-weight: 600;
  color: var(--color-heading);
  background: var(--color-light);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
tr:hover td { background: var(--color-light); }

/* ===== Blog ===== */
.blog-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.blog-card .blog-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: #666;
  margin-bottom: var(--space-sm);
}
.blog-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}
.blog-card p {
  color: #555;
  font-size: 0.9375rem;
  flex-grow: 1;
}
.blog-card .read-more {
  margin-top: var(--space-md);
  font-weight: 600;
  font-size: 0.9375rem;
}

/* ===== Article ===== */
.article-header {
  max-width: 800px;
  margin: 0 auto var(--space-3xl);
  text-align: center;
}
.article-body {
  max-width: 800px;
  margin: 0 auto;
}
.article-body h2 {
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
}
.article-body h3 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}
.article-body p {
  margin-bottom: var(--space-lg);
  font-size: 1.0625rem;
  line-height: 1.7;
}
.article-body ul, .article-body ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}
.article-body ul li { list-style: disc; margin-bottom: var(--space-sm); }
.article-body ol li { list-style: decimal; margin-bottom: var(--space-sm); }

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  text-align: center;
  padding: var(--space-3xl) 0;
}
.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}
.cta-section p {
  color: rgba(255,255,255,0.9);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}
.cta-section .btn-dark {
  background: var(--color-white);
  color: var(--color-primary);
}
.cta-section .btn-dark:hover {
  background: var(--color-light);
}

/* ===== Model Grid ===== */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
}
.model-badge {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-sm);
  text-align: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-body);
  transition: all var(--transition-base);
}
.model-badge:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

/* ===== Process Steps ===== */
.steps {
  display: flex;
  gap: var(--space-xl);
  counter-reset: step;
}
.step {
  flex: 1;
  text-align: center;
  position: relative;
}
.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0 auto var(--space-md);
}
.step h4 {
  margin-bottom: var(--space-sm);
}
.step p {
  font-size: 0.9375rem;
  color: #666;
}

@media (max-width: 640px) {
  .steps { flex-direction: column; }
}

/* ===== Testimonial ===== */
.testimonial {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}
.testimonial p {
  font-style: italic;
  font-size: 1.0625rem;
  margin-bottom: var(--space-md);
  color: #444;
}
.testimonial .author {
  font-weight: 600;
  color: var(--color-heading);
}
.testimonial .meta {
  font-size: 0.875rem;
  color: #666;
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.mb-0 { margin-bottom: 0; }
.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); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }