/* =================================================================
   KALKULATOR WYLEWKI - COMPLETE DESIGN SYSTEM
   Trusty Blue × Desert Clay — Remont 2026
   ================================================================= */

/* 1. CSS Custom Properties (:root) */
:root[data-theme="remont-clean"] {
  /* WARIANT A: Trusty Blue × Desert Clay — Remont 2026 */
  --primary:       #368cbf;
  --primary-dark:  #24648c;
  --primary-light: #6eb7e3;
  --secondary:     #c27e6a;
  --accent:        #ffd66b;
  --accent-light:  #ffeaa3;

  --on-primary:    #ffffff;
  --on-secondary:  #ffffff;
  --on-accent:     #1a262e;

  --success:       #10b981;
  --success-light: #d1fae5;
  --danger:        #ef4444;
  --danger-light:  #fee2e2;
  --warning:       #f59e0b;
  --warning-light: #fef3c7;

  /* Elevated Neutrals — błękitnawe, bardzo czyste szarości */
  --gray-50:  #f4f7f9;
  --gray-100: #e6eef2;
  --gray-200: #cce0eb;
  --gray-300: #aacce0;
  --gray-400: #88b6d1;
  --gray-500: #669dbf;
  --gray-600: #4f7e9c;
  --gray-700: #40637a;
  --gray-800: #334e61;
  --gray-900: #1a262e;

  --shadow-sm:  0 1px 2px rgba(54, 140, 191, .08);
  --shadow-md:  0 4px 12px rgba(54, 140, 191, .12);
  --shadow-lg:  0 8px 24px rgba(54, 140, 191, .16);
  --shadow-xl:  0 16px 48px rgba(54, 140, 191, .20);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --max-width:  1200px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Header height for scroll calculations */
  --header-height: 72px;
}

/* 2. Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* 3. Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
}

h4 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1rem;
  color: var(--gray-700);
}

p:last-child {
  margin-bottom: 0;
}

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

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

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

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

.text-muted {
  color: var(--gray-500);
}

.font-light {
  font-weight: 300;
}

.font-medium {
  font-weight: 500;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

/* 4. Layout (container, grids) */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.section-sm {
  padding: 2rem 0;
}

.section-lg {
  padding: 6rem 0;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

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

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

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

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.gap-4 { gap: 2rem; }

/* 5. Top Bar */
.top-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--on-primary);
  padding: 0.75rem 0;
  font-size: 0.875rem;
}

.top-bar-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.top-bar i {
  font-size: 1rem;
}

/* 6. Header & Navigation */
.header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.logo i {
  color: var(--primary);
  font-size: 1.5rem;
}

.logo span {
  color: var(--primary);
  font-weight: 600;
}

/* 7. Hamburger & Mobile Menu */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--gray-800);
  transition: var(--transition);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 8. Dropdown Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--gray-700);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

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

.nav-link:hover::after {
  width: 100%;
}

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

.nav-link.active::after {
  width: 100%;
}

.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.dropdown-toggle i {
  font-size: 0.75rem;
  transition: var(--transition);
}

.dropdown.open .dropdown-toggle i {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.75rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 100;
}

.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  color: var(--gray-700);
  font-size: 0.875rem;
  transition: var(--transition);
}

.dropdown-item i {
  color: var(--primary);
  width: 20px;
  text-align: center;
}

.dropdown-item:hover {
  background: var(--gray-50);
  color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--on-primary);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: var(--secondary);
  color: var(--on-secondary);
}

.btn-secondary:hover {
  background: #a86b5a;
  color: var(--on-secondary);
}

.btn-accent {
  background: var(--accent);
  color: var(--on-accent);
}

.btn-accent:hover {
  background: var(--accent-light);
  color: var(--on-accent);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--on-primary);
}

.btn-massive-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem 2.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: var(--on-accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-massive-cta:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-xl);
  color: var(--on-accent);
}

/* 9. Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--on-primary);
  padding: 4rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero h1 {
  color: var(--on-primary);
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  color: rgba(255, 255, 255, 0.9);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.stat-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  text-align: center;
}

.stat-card i {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  opacity: 0.9;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  display: block;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* 10. Calculator */
.calculator-section {
  background: white;
  padding: 4rem 0;
}

.calculator-section h2 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.calculator-section > .container > p {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2rem;
  color: var(--gray-600);
}

.calc-container {
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.calc-field label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--gray-700);
}

.calc-field input,
.calc-field select {
  padding: 0.875rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: var(--transition);
  background: white;
}

.calc-field input:focus,
.calc-field select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(54, 140, 191, 0.1);
}

.calc-field .input-hint {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* 11. Calculator Results */
.calc-results {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 2px solid var(--gray-200);
  animation: fadeIn 0.5s ease-out;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.result-card {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

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

.result-card.primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

.result-card.primary .result-label {
  color: rgba(255, 255, 255, 0.8);
}

.result-card.primary .result-value {
  color: white;
}

.result-label {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 0.5rem;
}

.result-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
}

.result-unit {
  font-size: 0.875rem;
  font-weight: 500;
}

.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

/* 11a. Calculator Article / Methodology */
.pillar-content {
  padding: 4rem 0;
}

.pillar-content h2 {
  margin-bottom: 1.5rem;
}

.pillar-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.how-it-works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.step-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  position: relative;
  transition: var(--transition);
}

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

.step-number {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.step-card i {
  font-size: 2.5rem;
  color: var(--primary);
  margin: 1rem 0 1.5rem;
}

.step-card h4 {
  margin-bottom: 0.75rem;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.info-box {
  background: var(--gray-50);
  border-left: 4px solid var(--primary);
  padding: 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
}

.info-box.highlight {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--gray-100) 100%);
  border-left-color: var(--primary-dark);
}

.info-box h4 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  color: var(--gray-900);
}

.info-box ul {
  list-style: disc;
  padding-left: 1.5rem;
}

.info-box li {
  margin-bottom: 0.5rem;
  color: var(--gray-700);
}

.variant-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.variant-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  transition: var(--transition);
}

.variant-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.variant-card.featured {
  border-color: var(--accent);
  background: linear-gradient(135deg, white 0%, var(--accent-light) 100%);
}

.variant-card h4 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.variant-price {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  margin: 1rem 0;
}

.variant-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.factors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.factor-card {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.factor-card i {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.factor-card h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.factor-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.pros-cons-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.pros-box,
.cons-box {
  padding: 1.5rem;
  border-radius: var(--radius-lg);
}

.pros-box {
  background: var(--success-light);
  border: 1px solid var(--success);
}

.cons-box {
  background: var(--danger-light);
  border: 1px solid var(--danger);
}

.pros-box h4,
.cons-box h4 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.pros-box h4 {
  color: var(--success);
}

.cons-box h4 {
  color: var(--danger);
}

.pros-box ul,
.cons-box ul {
  list-style: none;
}

.pros-box li,
.cons-box li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
}

.pros-box li i {
  color: var(--success);
  margin-top: 0.25rem;
}

.cons-box li i {
  color: var(--danger);
  margin-top: 0.25rem;
}

.kpi-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.kpi-card {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

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

.kpi-card.highlight {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
}

.kpi-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.kpi-card.highlight .kpi-value {
  color: var(--on-accent);
}

.kpi-label {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.kpi-card.highlight .kpi-label {
  color: var(--on-accent);
  opacity: 0.8;
}

.checklist-box {
  background: var(--gray-50);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  margin: 1.5rem 0;
}

.checklist-box h4 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.checklist-box ul {
  list-style: none;
}

.checklist-box li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  padding: 0.5rem;
  background: white;
  border-radius: var(--radius-sm);
}

.checklist-box li i {
  color: var(--success);
}

/* 12. Savings Banner */
.savings-banner {
  background: var(--success-light);
  border: 1px solid var(--success);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.savings-banner i {
  font-size: 2rem;
  color: var(--success);
}

.savings-banner-content h4 {
  color: var(--success);
  margin-bottom: 0.25rem;
}

.savings-banner-content p {
  color: var(--gray-700);
  font-size: 0.875rem;
  margin: 0;
}

/* 13. Chart Container */
.chart-container {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin: 1.5rem 0;
  position: relative;
  height: 400px;
}

.chart-container canvas {
  max-height: 100%;
}

/* 14. Section: How It Works */
.section-how-it-works {
  background: var(--gray-100);
  padding: 4rem 0;
}

/* 15. Author Box */
.author-box {
  background: white;
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin: 2rem 0;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.author-image {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--primary);
}

.author-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-content {
  flex: 1;
}

.author-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.author-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}

.author-badge {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.author-social {
  display: flex;
  gap: 0.5rem;
  margin-left: auto;
}

.author-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  transition: var(--transition);
}

.author-social a:hover {
  background: var(--primary);
  color: white;
}

.author-bio {
  color: var(--gray-600);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.author-bio p {
  margin-bottom: 0.75rem;
}

/* 16. Knowledge Base / Articles Grid */
.knowledge-section {
  background: var(--gray-50);
  padding: 4rem 0;
}

.knowledge-section h2 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.knowledge-section > .container > p {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2.5rem;
  color: var(--gray-600);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.article-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.article-card-icon {
  height: 80px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-card-icon i {
  font-size: 2.5rem;
  color: white;
}

.article-card-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-tag {
  display: inline-block;
  background: var(--accent-light);
  color: var(--on-accent);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  width: fit-content;
}

.article-card h3 {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.article-card h3 a {
  color: var(--gray-900);
}

.article-card h3 a:hover {
  color: var(--primary);
}

.article-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
  flex: 1;
  margin-bottom: 1rem;
}

.article-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.875rem;
}

.article-card-link:hover {
  gap: 0.75rem;
}

/* 17. Testimonials */
.testimonials-section {
  background: white;
  padding: 4rem 0;
}

.testimonials-section h2 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.testimonials-section > .container > p {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2.5rem;
  color: var(--gray-600);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  background: var(--gray-50);
  padding: 2rem;
  border-radius: var(--radius-lg);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 4rem;
  color: var(--gray-200);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-stars {
  color: var(--accent);
  margin-bottom: 1rem;
}

.testimonial-text {
  font-style: italic;
  color: var(--gray-700);
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.testimonial-author {
  font-weight: 600;
  color: var(--gray-900);
}

.testimonial-role {
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* 18. CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--on-primary);
  padding: 4rem 0;
  text-align: center;
}

.cta-section h2 {
  color: var(--on-primary);
  margin-bottom: 1rem;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

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

.cta-section .btn-primary:hover {
  background: var(--gray-100);
  color: var(--primary-dark);
}

.cta-section .btn-accent {
  background: var(--accent);
  color: var(--on-accent);
}

.cta-section .btn-accent:hover {
  background: var(--accent-light);
}

/* 19. FAQ Accordion */
.faq-section {
  background: var(--gray-50);
  padding: 4rem 0;
}

.faq-section h2 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.faq-section > .container > p {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2.5rem;
  color: var(--gray-600);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-weight: 600;
  color: var(--gray-900);
  background: white;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--gray-50);
}

.faq-question i {
  color: var(--primary);
  transition: var(--transition);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

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

.faq-answer-content {
  padding: 0 1.5rem 1.5rem;
  color: var(--gray-600);
}

.faq-answer-content p {
  margin-bottom: 0.75rem;
}

.faq-answer-content p:last-child {
  margin-bottom: 0;
}

.faq-answer-content a {
  color: var(--primary);
  text-decoration: underline;
}

/* 20. Footer */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: white;
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.footer-col p {
  color: var(--gray-400);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-logo i {
  color: var(--primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--gray-400);
  font-size: 0.875rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
  padding-left: 0.25rem;
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* 21. Back-to-Top */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

/* 22. Breadcrumb */
.breadcrumb {
  background: var(--gray-100);
  padding: 1rem 0;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-list a {
  color: var(--gray-600);
  font-size: 0.875rem;
}

.breadcrumb-list a:hover {
  color: var(--primary);
}

.breadcrumb-list li:last-child {
  color: var(--gray-900);
  font-size: 0.875rem;
  font-weight: 500;
}

.breadcrumb-separator {
  color: var(--gray-400);
  font-size: 0.75rem;
}

/* 23. Article Hero */
.article-hero {
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-50) 100%);
  padding: 3rem 0;
}

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

.article-hero h1 {
  margin-bottom: 1rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--gray-600);
}

.article-meta-item i {
  color: var(--primary);
}

.article-tag {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* 24. Article Content (content-area) */
.content-area {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 0;
}

.content-area h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.content-area h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.content-area p {
  margin-bottom: 1.25rem;
  line-height: 1.8;
}

.content-area ul,
.content-area ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.content-area ul {
  list-style: disc;
}

.content-area ol {
  list-style: decimal;
}

.content-area li {
  margin-bottom: 0.5rem;
  color: var(--gray-700);
}

.content-area blockquote {
  background: var(--gray-50);
  border-left: 4px solid var(--primary);
  padding: 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--gray-700);
}

.content-area blockquote cite {
  display: block;
  margin-top: 1rem;
  font-style: normal;
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* 25. Tables (comparison-table) */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  font-size: 0.9375rem;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.comparison-table th {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.comparison-table tr:hover {
  background: var(--gray-50);
}

.comparison-table td strong {
  color: var(--gray-900);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  padding: 0.875rem 1rem;
  text-align: left;
  border: 1px solid var(--gray-200);
}

.data-table th {
  background: var(--gray-100);
  font-weight: 600;
  color: var(--gray-800);
}

.data-table tr:nth-child(even) {
  background: var(--gray-50);
}

.regional-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.875rem;
}

.regional-table th,
.regional-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.regional-table th {
  font-weight: 600;
  color: var(--gray-700);
}

/* 26. Info Boxes (success, warning, tip) */
.info-box.success {
  background: var(--success-light);
  border-left-color: var(--success);
}

.info-box.success h4 {
  color: var(--success);
}

.info-box.warning {
  background: var(--warning-light);
  border-left-color: var(--warning);
}

.info-box.warning h4 {
  color: var(--warning);
}

.info-box.tip {
  background: var(--accent-light);
  border-left-color: var(--accent);
}

.info-box.tip h4 {
  color: var(--on-accent);
}

/* 27. Inline CTA */
.inline-cta {
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-50) 100%);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 2rem 0;
  text-align: center;
}

.inline-cta h4 {
  margin-bottom: 0.5rem;
}

.inline-cta p {
  color: var(--gray-600);
  margin-bottom: 1.5rem;
}

.inline-cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* 28. Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* 29. Animations (@keyframes) */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* 30. Media Queries (mobile-first breakpoints) */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .how-it-works-grid,
  .factors-grid,
  .kpi-cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  :root[data-theme="remont-clean"] {
    --header-height: 64px;
  }

  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    flex-direction: column;
    padding: 2rem;
    gap: 1rem;
    transform: translateX(100%);
    transition: transform 0.3s ease-out;
    overflow-y: auto;
  }

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

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: var(--gray-50);
    margin-top: 0.5rem;
    display: none;
  }

  .dropdown.open .dropdown-menu {
    display: block;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .grid-2,
  .grid-3,
  .articles-grid,
  .testimonials-grid,
  .how-it-works-grid,
  .variant-cards-grid,
  .factors-grid,
  .kpi-cards,
  .pros-cons-grid {
    grid-template-columns: 1fr;
  }

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

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

  .author-box {
    flex-direction: column;
    text-align: center;
  }

  .author-image {
    margin: 0 auto;
  }

  .author-header {
    justify-content: center;
  }

  .author-social {
    margin-left: 0;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-logo {
    justify-content: center;
  }

  .footer-links {
    align-items: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .cta-buttons,
  .inline-cta-buttons,
  .results-actions {
    flex-direction: column;
  }

  .btn-massive-cta {
    width: 100%;
  }

  .chart-container {
    height: 300px;
  }

  .section {
    padding: 3rem 0;
  }

  .section-lg {
    padding: 4rem 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .hero {
    padding: 3rem 0 4rem;
  }

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

  .calc-container {
    padding: 1.5rem;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }
}

/* Print styles */
@media print {
  .header,
  .top-bar,
  .back-to-top,
  .cta-section,
  .cookie-banner {
    display: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }

  .content-area {
    max-width: 100%;
  }
}