:root {
  --vi-bg: #f8fafc;
  --vi-surface: #ffffff;
  --vi-surface-alt: #f1f5f9;
  --vi-tone: #0284c7;
  --vi-tone-hover: #0369a1;
  --vi-tone-light: #e0f2fe;
  --vi-tone-border: #bae6fd;
  --vi-ink: #0f172a;
  --vi-ink-sub: #475569;
  --vi-border: #e2e8f0;
  --vi-radius: 14px;
  --vi-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --vi-max-w: 1140px;
  --font-display: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--vi-bg);
  color: var(--vi-ink);
  font-family: var(--font-body);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.vi-shell {
  width: 100%;
  max-width: var(--vi-max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Header */
.vi-header {
  width: 100%;
  background-color: var(--vi-surface);
  border-bottom: 1px solid var(--vi-border);
  position: relative;
  z-index: 20;
}

.vi-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.vi-brand-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--vi-ink);
}

.vi-brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--vi-tone);
}

/* Main */
main {
  flex: 1 1 0%;
}

/* Product Section (Preset A - Split Sticky) */
.vi-product-sec {
  padding-top: 2.5rem;
  padding-bottom: 3.5rem;
  position: relative;
}

.vi-product-bg-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.vi-product-split {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

@media (min-width: 768px) {
  .vi-product-split {
    flex-direction: row;
    align-items: flex-start;
  }
  .vi-sticky-col {
    width: 40%;
    position: sticky;
    top: 2rem;
    align-self: flex-start;
  }
  .vi-content-col {
    width: 60%;
  }
}

.vi-img-wrapper {
  background-color: var(--vi-surface);
  border-radius: var(--vi-radius);
  border: 1px solid var(--vi-border);
  padding: 1.5rem;
  box-shadow: var(--vi-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
}

.vi-img-wrapper img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.vi-head-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.875rem;
  line-height: 1.25;
  text-transform: uppercase;
  color: var(--vi-ink);
  margin-bottom: 1rem;
}

.vi-summary-card {
  background-color: var(--vi-surface);
  border: 1px solid var(--vi-border);
  border-radius: var(--vi-radius);
  padding: 1.25rem;
  box-shadow: var(--vi-shadow);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--vi-ink-sub);
}

.vi-perks-stack {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.vi-perk-entry {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.vi-perk-icon-sm {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--vi-tone);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.vi-perk-text {
  font-size: 0.95rem;
  color: var(--vi-ink);
  font-weight: 500;
}

.vi-guarantee-strip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--vi-tone-light);
  border: 1px solid var(--vi-tone-border);
  border-radius: var(--vi-radius);
  padding: 0.875rem 1.25rem;
  margin-bottom: 1.75rem;
  font-size: 0.875rem;
  color: #0369a1;
  font-weight: 600;
}

.vi-offer-zone {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: var(--vi-surface);
  border-radius: var(--vi-radius);
  border: 1px solid var(--vi-border);
  padding: 1.5rem;
  box-shadow: var(--vi-shadow);
}

@media (min-width: 640px) {
  .vi-offer-zone {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.vi-price-badge {
  display: inline-flex;
  flex-direction: column;
  background-color: var(--vi-tone-light);
  border: 1px solid var(--vi-tone-border);
  padding: 0.5rem 1.25rem;
  border-radius: var(--vi-radius);
}

.vi-price-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--vi-ink-sub);
  font-weight: 600;
}

.vi-price-val {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--vi-tone);
}

.vi-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--vi-tone);
  color: #ffffff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  padding: 0.875rem 2.25rem;
  border-radius: var(--vi-radius);
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.vi-action-btn:hover {
  background-color: var(--vi-tone-hover);
  transform: translateY(-1px);
}

/* Features Section (3 Horizontal Rows) */
.vi-features-sec {
  background-color: var(--vi-surface);
  border-top: 1px solid var(--vi-border);
  border-bottom: 1px solid var(--vi-border);
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
}

.vi-sec-heading {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.75rem;
  text-transform: uppercase;
  text-align: center;
  color: var(--vi-ink);
  margin-bottom: 2.5rem;
}

.vi-feature-rows {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.vi-feature-row {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  background-color: var(--vi-bg);
  border: 1px solid var(--vi-border);
  border-radius: var(--vi-radius);
  padding: 1.25rem 1.5rem;
}

.vi-icon-circle {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 9999px;
  background-color: var(--vi-tone-light);
  color: var(--vi-tone);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.vi-feature-info {
  flex: 1 1 0%;
}

.vi-feature-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--vi-ink);
  margin-bottom: 0.35rem;
}

.vi-feature-desc {
  font-size: 0.95rem;
  color: var(--vi-ink-sub);
  line-height: 1.5;
}

/* Testimonials Section */
.vi-reviews-sec {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
  background-color: var(--vi-surface-alt);
}

.vi-reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .vi-reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.vi-review-card {
  background-color: var(--vi-surface);
  border-radius: var(--vi-radius);
  border: 1px solid var(--vi-border);
  border-top: 4px solid var(--vi-tone);
  padding: 1.5rem;
  box-shadow: var(--vi-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.vi-review-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vi-user-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.vi-avatar-circle {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  background-color: var(--vi-tone);
  color: #ffffff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vi-user-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--vi-ink);
}

.vi-stars {
  display: flex;
  color: #f59e0b;
  gap: 0.15rem;
}

.vi-review-text {
  font-size: 0.95rem;
  color: var(--vi-ink-sub);
  line-height: 1.6;
}

/* Footer */
.vi-footer {
  width: 100%;
  background-color: var(--vi-ink);
  color: #f8fafc;
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  margin-top: auto;
  z-index: 20;
}

.vi-footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .vi-footer-inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

.vi-footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #ffffff;
  text-decoration: none;
}

.vi-footer-brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  text-transform: uppercase;
  color: #ffffff;
}

.vi-footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
}

.vi-footer-link {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.vi-footer-link:hover {
  color: #ffffff;
}