:root {
  /* DARK THEME PALETTE (Prefix di- matching Diaclose) */
  --dc-bg: #090d16;            /* Deep dark space background */
  --dc-surface: #131b2e;       /* Card/surface contrast background */
  --dc-surface-tint: #1e2942;  /* Lighter dark tone for hovering/tinting */
  --dc-vitality: #06b6d4;      /* Active cyan accent */
  --dc-vitality-hover: #0891b2;/* Cyan hover state */
  --dc-decor-ink: #3b82f6;     /* Deep slate blue secondary */
  --dc-text-bright: #f8fafc;   /* Primary white readable text */
  --dc-text-muted: #94a3b8;    /* Muted grey text */
  
  /* Fonts */
  --font-display: 'Montserrat', sans-serif;
  --font-body: 'Poppins', sans-serif;

  /* Custom Settings based on requirements */
  --dc-max-width: 1140px;      /* Random container width within limits */
  --dc-radius: 16px;           /* Soft style border-radius */
  --dc-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4); /* Raised shadow depth */
}

/* Global Reset & Base Styling */
body {
  background-color: var(--dc-bg);
  color: var(--dc-text-bright);
  font-family: var(--font-body);
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* Base Headings styling */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase; /* Heading-case: uppercase */
  color: var(--dc-text-bright);
}

/* Containment Shell (Width limits strictly on main structures) */
.di-shell {
  max-width: var(--dc-max-width);
  width: 100%;
}

/* HEADER STYLE */
.di-header-stripe {
  background-color: var(--dc-surface);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
  width: 100%;
  z-index: 20;
}
.di-brand-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -0.05em;
  color: var(--dc-text-bright);
}
.di-brand-glyph {
  width: 2rem;
  height: 2rem;
  color: var(--dc-vitality);
}

/* AMBIENT BACKGROUND DECOR */
.di-ambient-pattern {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* PRODUCT SECTION (PRESET A - SPLIT STICKY) */
.di-showcase-segment {
  background: radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 40%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* Image styling */
.di-item-media {
  border-radius: var(--dc-radius);
  box-shadow: var(--dc-shadow);
  max-height: 420px;
  background-color: var(--dc-surface);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Details and texts */
.di-tagline {
  color: var(--dc-vitality);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.5rem;
}
.di-lead-heading {
  font-size: 2.75rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--dc-text-bright) 40%, var(--dc-vitality) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.di-deck-heading {
  color: var(--dc-text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}
.di-slate-panel {
  background-color: var(--dc-surface);
  border-radius: var(--dc-radius);
  padding: 1.5rem;
  border-left: 4px solid var(--dc-vitality);
  box-shadow: var(--dc-shadow);
}
.di-narrative {
  color: var(--dc-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Bullet markers */
.di-bullet-marker {
  color: var(--dc-vitality);
  font-weight: bold;
}

/* Guarantee Area */
.di-security-badge {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--dc-radius);
  padding: 1rem 1.25rem;
}
.di-security-icon {
  width: 2.5rem;
  height: 2.5rem;
  color: var(--dc-vitality);
}
.di-security-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--dc-text-bright);
}
.di-security-text {
  font-size: 0.8rem;
  color: var(--dc-text-muted);
}

/* Pricing and Badge Styles */
.di-price-label {
  font-size: 0.75rem;
  color: var(--dc-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}
.di-price-tag {
  background-color: var(--dc-surface-tint);
  border: 1px solid var(--dc-vitality);
  border-radius: var(--dc-radius);
  padding: 0.5rem 1.25rem;
  color: var(--dc-vitality);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.75rem;
  display: inline-block;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
}

/* CTA Trigger */
.di-action-trigger {
  background: linear-gradient(135deg, var(--dc-vitality) 0%, var(--dc-vitality-hover) 100%);
  color: #000 !important;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  text-transform: uppercase;
  padding: 1rem 2rem;
  border-radius: var(--dc-radius);
  box-shadow: 0 8px 20px rgba(6, 182, 212, 0.3);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}
.di-action-trigger:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(6, 182, 212, 0.45);
  filter: brightness(1.1);
}

/* FEATURES SECTION (Preset A horizontal rows) */
.di-perks-segment {
  background-color: var(--dc-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.di-sub-heading {
  font-size: 2.25rem;
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.di-perk-row {
  border-radius: var(--dc-radius);
  border: 1px solid rgba(255, 255, 255, 0.05);
  background-color: var(--dc-surface);
  padding: 1.75rem;
  transition: border-color 0.3s ease;
}
.di-perk-row:hover {
  border-color: rgba(6, 182, 212, 0.3);
}
.di-perk-ico-wrapper {
  background-color: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  color: var(--dc-vitality);
  border-radius: 9999px;
  width: 4rem;
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
.di-perk-title {
  font-size: 1.25rem;
  color: var(--dc-text-bright);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

/* TESTIMONIALS SECTION (Preset A Cards style) */
.di-feedback-segment {
  background-color: var(--dc-surface);
  position: relative;
}
.di-feedback-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .di-feedback-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .di-feedback-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.di-feedback-envelope {
  background-color: var(--dc-bg);
  border-radius: var(--dc-radius);
  padding: 2rem;
  box-shadow: var(--dc-shadow);
  border-top: 4px solid var(--dc-vitality); /* Requirement: color top border */
  border-left: 1px solid rgba(255, 255, 255, 0.03);
  border-right: 1px solid rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  transition: transform 0.3s ease;
}
.di-feedback-envelope:hover {
  transform: translateY(-4px);
}
.di-feedback-quote {
  font-size: 1rem;
  line-height: 1.6;
  font-style: italic;
  color: var(--dc-text-muted);
}
.di-avatar-initials {
  width: 3rem;
  height: 3rem;
  border-radius: 9999px;
  background-color: var(--dc-vitality);
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-family: var(--font-display);
}
.di-avatar-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dc-text-bright);
  line-height: 1.2;
}
.di-avatar-subtitle {
  font-size: 0.8rem;
  color: var(--dc-text-muted);
}

/* FOOTER STYLE */
.di-footer-stripe {
  background-color: var(--dc-bg);
  border-t: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
  z-index: 20;
}
.di-footer-links a {
  font-size: 0.85rem;
  color: var(--dc-text-muted);
  text-decoration: none;
  transition: color 0.3s ease;
}
.di-footer-links a:hover {
  color: var(--dc-vitality);
}

/* Responsive Sticky Tuning */
@media (min-width: 768px) {
  .md\:sticky {
    position: sticky;
    top: 2rem;
  }
}