/* ============================================
   SUBSTRATY.PL - Premium Website Stylesheet
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-primary: #059669;
  --color-primary-dark: #047857;
  --color-primary-light: #10B981;
  --color-primary-bg: #F0FDF4;
  --color-primary-bg-alt: #DCFCE7;
  --color-dark: #1F2937;
  --color-text: #374151;
  --color-text-light: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-bg: #FAFAFA;
  --color-white: #FFFFFF;
  --color-border: #E5E7EB;
  --color-accent-warm: #F59E0B;
  --color-accent-red: #EF4444;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
  --max-width: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ---------- Utility ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

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

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

.section--green {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  color: var(--color-white);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-bg);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.section--dark .section-label,
.section--green .section-label {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section--dark .section-title,
.section--green .section-title {
  color: var(--color-white);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 640px;
  line-height: 1.7;
}

.section--dark .section-subtitle,
.section--green .section-subtitle {
  color: rgba(255,255,255,0.8);
}

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

.text-center .section-subtitle {
  margin: 0 auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-main);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(5, 150, 105, 0.3);
}

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

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-1px);
}

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

.btn--white:hover {
  background: #f0fdf4;
  color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255,255,255,0.3);
}

.btn--ghost:hover {
  border-color: var(--color-white);
  background: rgba(255,255,255,0.1);
  color: var(--color-white);
}

.btn--sm {
  font-size: 0.8125rem;
  padding: 10px 20px;
}

.btn--lg {
  font-size: 1rem;
  padding: 18px 36px;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.nav--scrolled {
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav__logo img {
  height: 36px;
  width: auto;
}

.nav__logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-dark);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-dark);
}

/* Mobile menu */
.nav__mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  padding: 24px;
  z-index: 999;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

.nav__mobile-menu.is-open {
  display: flex;
}

.nav__mobile-link {
  display: block;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
}

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

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  background: linear-gradient(160deg, #FAFAFA 0%, #F0FDF4 40%, #DCFCE7 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(5,150,105,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -150px;
  left: -150px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(5,150,105,0.05) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  padding: 8px 20px 8px 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero__badge-icon {
  width: 28px;
  height: 28px;
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 0.75rem;
}

.hero__title {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero__title span {
  color: var(--color-primary);
}

.hero__description {
  font-size: 1.25rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 520px;
}

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero__phone {
  position: relative;
  width: 280px;
  height: 580px;
  background: var(--color-dark);
  border-radius: 40px;
  padding: 12px;
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255,255,255,0.1);
}

.hero__phone-screen {
  width: 100%;
  height: 100%;
  background: var(--color-white);
  border-radius: 30px;
  overflow: hidden;
  position: relative;
}

.hero__phone-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 28px;
  background: var(--color-dark);
  border-bottom-left-radius: 20px;
  border-bottom-right-radius: 20px;
  z-index: 2;
}

.hero__phone-content {
  padding: 40px 16px 16px;
  height: 100%;
  overflow: hidden;
}

.hero__phone-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.hero__phone-logo {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #00D000, #00A000);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 14px;
}

.hero__phone-avatar {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #059669, #047857);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 12px;
}

.hero__phone-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark);
}

.hero__phone-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.phone-card {
  background: var(--color-bg);
  border-radius: 10px;
  padding: 12px;
}

.phone-card__label {
  font-size: 11px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.phone-card__value {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
}

.phone-card__trend {
  font-size: 11px;
  color: var(--color-primary);
  font-weight: 500;
}

.phone-card--grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.phone-mini-card {
  background: var(--color-white);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}

.phone-mini-card__icon {
  font-size: 18px;
  margin-bottom: 4px;
}

.phone-mini-card__label {
  font-size: 10px;
  color: var(--color-text-muted);
}

.hero__phone-2 {
  position: absolute;
  right: -60px;
  top: 60px;
  width: 240px;
  height: 500px;
  background: var(--color-dark);
  border-radius: 34px;
  padding: 10px;
  box-shadow: var(--shadow-xl);
  opacity: 0.6;
  transform: rotate(6deg);
}

.hero__phone-2 .hero__phone-screen {
  border-radius: 26px;
}

.hero__stats {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

.hero__stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.hero__stat-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ---------- Mission / About ---------- */
.mission__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.mission__image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-primary-bg) 0%, var(--color-primary-bg-alt) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mission__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
}

.mission__list {
  list-style: none;
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mission__list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.mission__list-icon {
  width: 24px;
  height: 24px;
  min-width: 24px;
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-top: 2px;
}

.mission__list-icon svg {
  width: 14px;
  height: 14px;
}

/* ---------- Features ---------- */
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  text-align: center;
}

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

.feature-card__icon {
  width: 52px;
  height: 52px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin: 0 auto 20px;
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
}

.feature-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.feature-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- App Section ---------- */
.app-section {
  position: relative;
  overflow: hidden;
}

.app-section__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.app-section__phones {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 40px 0;
}

.app-phone {
  position: relative;
  width: 260px;
  height: 540px;
  background: #111;
  border-radius: 36px;
  padding: 10px;
  box-shadow: var(--shadow-xl);
  z-index: 2;
}

.app-phone__screen {
  width: 100%;
  height: 100%;
  background: var(--color-white);
  border-radius: 28px;
  overflow: hidden;
}

.app-phone__notch {
  width: 100px;
  height: 24px;
  background: #111;
  border-bottom-left-radius: 16px;
  border-bottom-right-radius: 16px;
  margin: 0 auto;
}

.app-phone--secondary {
  position: absolute;
  right: -20px;
  top: 40px;
  width: 230px;
  height: 480px;
  opacity: 0.7;
  transform: rotate(5deg);
  z-index: 1;
}

.app-phone__mock {
  padding: 36px 14px 14px;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mock-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.mock-logo {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, #00D000, #00A000);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 12px;
}

.mock-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-dark);
}

.mock-avatar {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, #059669, #047857);
  border-radius: 6px;
}

.mock-section-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-dark);
  margin-top: 8px;
}

.mock-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.mock-card {
  background: var(--color-bg);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}

.mock-card__icon {
  width: 28px;
  height: 28px;
  background: var(--color-primary-bg);
  border-radius: 6px;
  margin: 0 auto 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 14px;
}

.mock-card__label {
  font-size: 9px;
  color: var(--color-text-muted);
}

.mock-kpi {
  background: var(--color-bg);
  border-radius: 8px;
  padding: 10px;
}

.mock-kpi__value {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
}

.mock-kpi__label {
  font-size: 9px;
  color: var(--color-text-muted);
}

.mock-kpi__trend {
  font-size: 9px;
  color: var(--color-primary);
  font-weight: 500;
}

.mock-bottomnav {
  display: flex;
  justify-content: space-around;
  padding: 8px 0;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.mock-bottomnav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 8px;
  color: var(--color-text-muted);
}

.mock-bottomnav__item--active {
  color: var(--color-primary);
}

.mock-bottomnav__icon {
  width: 16px;
  height: 16px;
}

.app-section__features {
  list-style: none;
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.app-section__feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.app-section__feature-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.app-section__feature-icon svg {
  width: 22px;
  height: 22px;
}

.app-section__feature-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.app-section__feature-text {
  font-size: 0.875rem;
  opacity: 0.8;
  line-height: 1.5;
}

.app-store-badges {
  display: flex;
  gap: 12px;
  margin-top: 36px;
}

.app-store-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  color: var(--color-white);
  text-decoration: none;
  transition: all var(--transition);
}

.app-store-badge:hover {
  background: rgba(255,255,255,0.2);
  color: var(--color-white);
}

.app-store-badge svg {
  width: 24px;
  height: 24px;
}

.app-store-badge__text {
  line-height: 1.2;
}

.app-store-badge__text small {
  font-size: 0.625rem;
  opacity: 0.7;
  display: block;
}

.app-store-badge__text strong {
  font-size: 0.875rem;
}

/* ---------- Articles / SEO ---------- */
.articles__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

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

.article-card__image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.article-card__image-icon {
  font-size: 48px;
  opacity: 0.3;
  color: white;
}

.article-card__category {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
}

.article-card__body {
  padding: 24px;
}

.article-card__date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.article-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card__excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.article-card__link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition);
}

.article-card:hover .article-card__link svg {
  transform: translateX(4px);
}

/* ---------- Katalog Section ---------- */
.katalog {
  position: relative;
}

.katalog__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
}

.katalog__visual {
  position: relative;
}

.katalog__book {
  position: relative;
  width: 320px;
  height: 440px;
  margin: 0 auto;
  perspective: 1200px;
}

.katalog__book-cover {
  width: 100%;
  height: 100%;
  background: linear-gradient(160deg, #1F2937 0%, #111827 100%);
  border-radius: 4px 16px 16px 4px;
  box-shadow: var(--shadow-xl), -8px 0 16px rgba(0,0,0,0.1);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.katalog__book-cover::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 20px;
  background: linear-gradient(90deg, rgba(0,0,0,0.3) 0%, transparent 100%);
}

.katalog__book-cover::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1' fill='rgba(255,255,255,0.03)'/%3E%3C/svg%3E");
}

.katalog__book-logo {
  font-size: 0.875rem;
  font-weight: 600;
  opacity: 0.5;
  letter-spacing: 0.05em;
  position: relative;
  z-index: 1;
}

.katalog__book-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  position: relative;
  z-index: 1;
}

.katalog__book-title span {
  color: var(--color-primary-light);
}

.katalog__book-edition {
  font-size: 0.875rem;
  opacity: 0.5;
  position: relative;
  z-index: 1;
}

.katalog__book-accent {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(5,150,105,0.2) 0%, transparent 70%);
  z-index: 0;
}

.katalog__book-spine {
  position: absolute;
  left: -16px;
  top: 4px;
  bottom: 4px;
  width: 16px;
  background: linear-gradient(180deg, #374151 0%, #1F2937 100%);
  border-radius: 4px 0 0 4px;
  box-shadow: -2px 0 8px rgba(0,0,0,0.2);
}

.katalog__content h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 16px;
  line-height: 1.2;
}

.katalog__content p {
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.katalog__features {
  list-style: none;
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.katalog__features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--color-text);
}

.katalog__features-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.katalog__price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 24px;
}

.katalog__price-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-dark);
}

.katalog__price-period {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ---------- Stats ---------- */
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 32px 16px;
}

.stat-card__value {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-card__label {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.7);
}

/* ---------- Research ---------- */
.research__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.research-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

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

.research-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.research-card__icon svg {
  width: 24px;
  height: 24px;
}

.research-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.research-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- CTA ---------- */
.cta__inner {
  text-align: center;
  padding: 80px;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.cta__inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-dark);
  color: var(--color-white);
  padding: 64px 0 32px;
}

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

.footer__brand p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}

.footer__heading {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  color: rgba(255,255,255,0.5);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__link {
  color: rgba(255,255,255,0.7);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color var(--transition);
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__bottom {
  padding-top: 32px;
  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(255,255,255,0.4);
}

.footer__bottom-links {
  display: flex;
  gap: 24px;
}

.footer__bottom-links a {
  color: rgba(255,255,255,0.4);
  text-decoration: none;
  transition: color var(--transition);
}

.footer__bottom-links a:hover {
  color: var(--color-white);
}

/* ---------- Eco Banner ---------- */
.eco-banner {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-bg-alt);
  border-radius: var(--radius-lg);
  padding: 20px 28px;
  margin-top: 48px;
}

.eco-banner__icon {
  font-size: 32px;
  flex-shrink: 0;
}

.eco-banner__text {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.6;
}

.eco-banner__text strong {
  color: var(--color-primary-dark);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .hero__title {
    font-size: 2.75rem;
  }

  .hero__description {
    margin: 0 auto 40px;
  }

  .hero__stats {
    justify-content: center;
  }

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

  .hero__visual {
    order: -1;
  }

  .hero__phone-2 {
    display: none;
  }

  .mission__grid,
  .app-section__grid,
  .katalog__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

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

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

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

  .katalog__visual {
    order: -1;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .nav__links {
    display: none;
  }

  .nav__mobile-toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-top: 96px;
    padding-bottom: 64px;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__stats {
    flex-direction: column;
    gap: 24px;
    align-items: center;
  }

  .features__grid,
  .articles__grid,
  .research__grid {
    grid-template-columns: 1fr;
  }

  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .cta__inner {
    padding: 48px 24px;
  }

  .app-store-badges {
    flex-direction: column;
    align-items: stretch;
  }

  .app-phone--secondary {
    display: none;
  }

  .katalog__book {
    width: 260px;
    height: 360px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero__title {
    font-size: 1.875rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .hero__phone {
    width: 240px;
    height: 500px;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-group .btn {
    width: 100%;
    justify-content: center;
  }
}