/* ===== CSS Variables ===== */
:root {
  --primary: #1B2A4A;
  --primary-light: #2D4A7A;
  --primary-dark: #111D35;
  --accent: #3B82F6;
  --accent-hover: #2563EB;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  --success: #10B981;
  --success-light: #D1FAE5;
  --bg-white: #FFFFFF;
  --bg-light: #F8FAFC;
  --bg-dark: #1B2A4A;
  --text-dark: #1E293B;
  --text-gray: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --container: 1200px;
  --nav-height: 72px;
  --section-padding: 100px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: 'Pretendard', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-dark);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

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

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  color: var(--text-gray);
  line-height: 1.8;
}

.text-accent { color: var(--accent); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-white { color: #fff; }

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

.section {
  padding: var(--section-padding) 0;
}

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

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

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: #fff;
}

.section--dark p {
  color: #CBD5E1;
}

.section__header {
  text-align: center;
  margin-bottom: 60px;
}

.section__header h2 {
  margin-bottom: 16px;
}

.section__header p {
  font-size: 1.125rem;
  max-width: 700px;
  margin: 0 auto;
}

.section__quote {
  text-align: center;
  margin-top: 48px;
  padding: 32px;
  background: var(--bg-light);
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
}

.section--dark .section__quote {
  background: rgba(255,255,255,0.05);
}

.section__quote p {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-dark);
}

.section--dark .section__quote p {
  color: #fff;
}

.section__source {
  text-align: right;
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 24px;
}

.highlight {
  color: var(--accent);
  font-weight: 700;
}

.highlight--danger {
  color: var(--danger);
  font-weight: 700;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}

.btn--outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}

.btn--dark {
  background: var(--primary);
  color: #fff;
}

.btn--dark:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}

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

.btn--ghost:hover {
  background: var(--accent);
  color: #fff;
}

.btn--lg {
  padding: 16px 40px;
  font-size: 1.125rem;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: all var(--transition);
}

.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
}

.nav__logo img {
  height: 48px;
  width: auto;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-gray);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--accent);
  background: rgba(59,130,246,0.06);
}

.nav__cta {
  margin-left: 8px;
  padding: 10px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition);
}

.nav__cta:hover {
  background: var(--accent-hover);
}

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

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  padding: calc(var(--nav-height) + 40px) 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(59,130,246,0.15) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(59,130,246,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero__badge {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(59,130,246,0.15);
  color: #fff;
  border-radius: 100px;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 32px;
  border: 1px solid rgba(59,130,246,0.2);
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
  letter-spacing: 2px;
}

.hero__title .brand {
  display: block;
  height: 200px;
  width: auto;
  margin: 16px auto 0;
  filter: brightness(0) invert(1);
}

.hero__desc {
  font-size: 1.25rem;
  color: #CBD5E1;
  margin-bottom: 48px;
  line-height: 1.8;
}

.hero__buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: rgba(255,255,255,0.4);
}

.hero__scroll svg {
  width: 28px;
  height: 28px;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== Mini Hero (Sub pages) ===== */
.hero--mini {
  min-height: auto;
  padding: calc(var(--nav-height) + 60px) 24px 60px;
}

.hero--mini .hero__title {
  font-size: 2.5rem;
}

.hero--mini .hero__title .brand {
  height: 48px;
}

.hero__title--inline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.hero__title--inline .brand {
  display: inline-block;
  margin: 0;
}

/* ===== Stats Cards ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

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

.stat-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: rgba(59,130,246,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.stat-card__number {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-card__label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.stat-card__desc {
  font-size: 0.875rem;
  color: var(--text-gray);
}

/* ===== Threat Stats ===== */
.threat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.threat-chart {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.threat-chart__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  height: 260px;
  padding-top: 20px;
}

.chart-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
}

.chart-bar__value {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
  flex-shrink: 0;
}

.chart-bar__track {
  flex: 1;
  width: 100%;
  position: relative;
  display: flex;
  align-items: flex-end;
}

.chart-bar__fill {
  width: 100%;
  border-radius: 6px 6px 0 0;
  transition: height 1s ease;
}

.chart-bar__label {
  font-size: 0.8125rem;
  color: var(--text-gray);
  margin-top: 8px;
  flex-shrink: 0;
}

.threat-stats {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.threat-stat-box {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.threat-stat-box__row {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.threat-stat-box__number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
}

.threat-stat-box__unit {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-gray);
}

.threat-stat-box__label {
  font-size: 0.9375rem;
  color: var(--text-dark);
  font-weight: 600;
  margin-bottom: 4px;
}

.threat-stat-box__change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--danger);
  margin-top: 4px;
}

.threat-warning {
  margin-top: 32px;
  padding: 20px 24px;
  background: var(--danger-light);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--danger);
}

.threat-warning p {
  color: var(--text-dark);
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ===== Problems Grid ===== */
.problems {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.problem-card {
  padding: 28px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.problem-card:hover {
  border-color: var(--danger);
}

.problem-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.problem-card__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--danger-light);
  color: var(--danger);
  border-radius: 50%;
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
}

.problem-card__title {
  font-size: 1.125rem;
  font-weight: 700;
}

.problem-card__flow {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.problem-card__desc {
  font-size: 0.9375rem;
  color: var(--text-gray);
}

.problem-card__arrow {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--danger);
}

.problem-card__result {
  padding: 6px 12px;
  background: var(--danger-light);
  color: var(--danger);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
}

/* ===== Product Flow ===== */
.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 48px 0;
}

.flow__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 24px 20px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 140px;
  transition: all var(--transition);
}

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

.flow__step--highlight {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.flow__step--highlight .flow__step-label {
  color: rgba(255,255,255,0.8);
}

.flow__step-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.flow__step-name {
  font-weight: 700;
  font-size: 0.9375rem;
}

.flow__step-label {
  font-size: 0.8125rem;
  color: var(--text-gray);
  margin-top: 4px;
}

.flow__arrow {
  color: var(--text-light);
  font-size: 1.25rem;
  flex-shrink: 0;
}

/* ===== Process Steps ===== */
.process {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  margin-top: 48px;
}

.process__step {
  text-align: center;
  padding: 24px 16px;
  position: relative;
  flex: 1;
}

.process__arrow {
  display: flex;
  align-items: center;
  padding-top: 36px;
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

.process__header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 4px;
}

.process__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 700;
  flex-shrink: 0;
}

.process__icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.process__name {
  font-weight: 700;
  font-size: 1rem;
}

.process__desc {
  font-size: 0.8125rem;
  color: var(--text-gray);
}

/* ===== VS Comparison ===== */
.vs-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: stretch;
}

.vs-card {
  padding: 36px;
  border-radius: var(--radius);
}

.vs-card--old {
  background: #F1F5F9;
  border: 1px solid var(--border);
}

.vs-card--new {
  background: linear-gradient(135deg, rgba(59,130,246,0.05) 0%, rgba(59,130,246,0.1) 100%);
  border: 2px solid var(--accent);
}

.vs-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.vs-card--new .vs-card__title {
  color: var(--accent);
  border-bottom-color: rgba(59,130,246,0.2);
}

.vs-card__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.vs-card__item:last-child {
  border-bottom: none;
}

.vs-card__label {
  font-size: 0.875rem;
  color: var(--text-gray);
  min-width: 80px;
  flex-shrink: 0;
}

.vs-card__value {
  font-size: 0.9375rem;
  font-weight: 500;
}

.vs-card--old .vs-icon {
  color: var(--danger);
}

.vs-card--new .vs-icon {
  color: var(--success);
}

.vs-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 800;
  font-size: 0.8125rem;
  align-self: center;
}

/* ===== Feature Cards ===== */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px 28px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(59,130,246,0.1) 100%);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(27,42,74,0.3);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card__num {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(255,255,255,0.15);
  margin-bottom: 12px;
  position: relative;
}

.feature-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  position: relative;
}

.feature-card__desc {
  font-size: 0.875rem;
  color: #94A3B8;
  line-height: 1.7;
  position: relative;
}

/* ===== Effect Section ===== */
.effect-compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: stretch;
  margin-bottom: 60px;
}

.effect-box {
  padding: 36px;
  border-radius: var(--radius);
}

.effect-box--before {
  background: #F1F5F9;
  border: 1px solid var(--border);
}

.effect-box--after {
  background: linear-gradient(135deg, rgba(59,130,246,0.05), rgba(16,185,129,0.05));
  border: 2px solid var(--success);
}

.effect-box__tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.effect-box--before .effect-box__tag {
  background: var(--danger-light);
  color: var(--danger);
}

.effect-box--after .effect-box__tag {
  background: var(--success-light);
  color: var(--success);
}

.effect-box__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.effect-box__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  font-size: 0.9375rem;
}

.effect-box__item .icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.effect-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-light);
}

.effect-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.effect-card {
  padding: 32px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: left;
}

.effect-card__icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.effect-card__category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-light);
  margin-bottom: 8px;
}

.effect-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.effect-card__list {
  text-align: left;
}

.effect-card__list li {
  font-size: 0.875rem;
  color: var(--text-gray);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.effect-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* ===== CTA Section ===== */
.cta {
  text-align: center;
  padding: 80px 24px;
}

.cta h2 {
  color: #fff;
  margin-bottom: 16px;
}

.cta p {
  color: #CBD5E1;
  margin-bottom: 40px;
  font-size: 1.125rem;
}

.cta__buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark);
  padding: 40px 24px;
  text-align: center;
}

.footer__contacts {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer__contact {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #94A3B8;
  font-size: 0.9375rem;
}

.footer__contact svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.footer__divider {
  width: 100%;
  height: 1px;
  background: rgba(255,255,255,0.1);
  margin-bottom: 24px;
}

.footer__copy {
  font-size: 0.8125rem;
  color: #64748B;
}

/* ===== Scroll Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }
.fade-in-delay-5 { transition-delay: 0.5s; }
.fade-in-delay-6 { transition-delay: 0.6s; }

/* ===== Responsive: Tablet ===== */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }

  .hero__title { font-size: 2rem; }
  .hero__title .brand { height: 140px; }

  .stats { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .threat-grid { grid-template-columns: 1fr; }
  .problems { grid-template-columns: 1fr 1fr; }
  .process { gap: 0; }
  .vs-container { grid-template-columns: 1fr; gap: 16px; }
  .vs-badge { align-self: center; justify-self: center; }
  .feature-cards { grid-template-columns: repeat(2, 1fr); }
  .effect-compare { grid-template-columns: 1fr; gap: 16px; }
  .effect-arrow { transform: rotate(90deg); }
  .effect-cards { grid-template-columns: repeat(3, 1fr); }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
    --nav-height: 64px;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.25rem; }

  .nav__menu {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
  }

  .nav__menu.open {
    display: flex;
  }

  .nav__link {
    padding: 12px 16px;
    width: 100%;
    text-align: center;
  }

  .nav__cta {
    margin-left: 0;
    margin-top: 8px;
    text-align: center;
  }

  .nav__toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + 60px) 24px 60px;
  }

  .hero__title { font-size: 1.25rem; }
  .hero__title .brand { height: 100px; }
  .hero__desc { font-size: 1.0625rem; }
  .hero__buttons { flex-direction: column; align-items: center; }

  .stats { grid-template-columns: 1fr; gap: 16px; }
  .stat-card { padding: 28px 20px; }
  .stat-card__number { font-size: 2.75rem; }

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

  .flow { gap: 8px; }
  .flow__step { min-width: 100px; padding: 16px 12px; }
  .flow__arrow { font-size: 1rem; }

  .process { flex-wrap: wrap; }
  .process__arrow { display: none; }
  .process__step { flex: 0 0 45%; }

  .feature-cards { grid-template-columns: 1fr; }
  .effect-cards { grid-template-columns: 1fr; }

  .footer__contacts { flex-direction: column; align-items: center; gap: 16px; }

  .section__header { margin-bottom: 40px; }

  .chart-bars { height: 200px; }
}