:root {
  /* Dynamic Product CSS Variables */
  --tn-bg-deep: #090e17;
  --tn-bg-surface: #131b2a;
  --tn-bg-elevated: #1e293b;
  --tn-primary: #00d294;
  --tn-primary-hover: #00f5ad;
  --tn-primary-glow: rgba(0, 210, 148, 0.22);
  --tn-accent-warm: #ff5263;
  --tn-text-bright: #f8fafc;
  --tn-text-muted: #94a3b8;
  --tn-border-color: #263347;

  --font-heading: 'Oswald', sans-serif;
  --font-body: 'Roboto', sans-serif;

  --tn-max-width: 1140px;
  --tn-soft-radius: 16px;
  --tn-deep-shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.75), 0 0 24px rgba(0, 210, 148, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  min-height: 100vh;
}

body.tn-body-root {
  background-color: var(--tn-bg-deep);
  color: var(--tn-text-bright);
  font-family: var(--font-body);
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Container limits applied only to content */
.tn-shell-header,
.tn-shell-content,
.tn-shell-footer {
  width: 100%;
  max-width: var(--tn-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* HEADER */
.tn-top-bar {
  width: 100%;
  background-color: var(--tn-bg-surface);
  border-bottom: 1px solid var(--tn-border-color);
  padding-top: 1rem;
  padding-bottom: 1rem;
  position: relative;
  z-index: 20;
}

.tn-shell-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tn-brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--tn-text-bright);
}

.tn-logo-icon {
  color: var(--tn-primary);
  flex-shrink: 0;
}

.tn-brand-name {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--tn-text-bright);
}

.tn-decor-sparks {
  display: none;
}

@media (min-width: 768px) {
  .tn-decor-sparks {
    display: block;
  }
}

/* MAIN & BACKGROUND */
.tn-main-stage {
  flex: 1;
  position: relative;
  overflow: hidden;
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.tn-bg-decor-pattern {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* HERO SPLIT (Preset A) */
.tn-hero-split {
  position: relative;
  z-index: 10;
  padding-bottom: 3.5rem;
}

.tn-split-layout {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

@media (min-width: 900px) {
  .tn-split-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 3.5rem;
  }

  .tn-media-column {
    flex: 0 0 40%;
    max-width: 40%;
    position: sticky;
    top: 2rem;
    align-self: flex-start;
  }

  .tn-details-column {
    flex: 0 0 60%;
    max-width: 60%;
  }
}

.tn-sticky-holder {
  width: 100%;
}

.tn-image-backdrop {
  background: radial-gradient(circle, var(--tn-bg-elevated) 0%, var(--tn-bg-surface) 100%);
  border: 1px solid var(--tn-border-color);
  border-radius: var(--tn-soft-radius);
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: var(--tn-deep-shadow);
}

.tn-product-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 15px 25px rgba(0,0,0,0.5));
}

/* Content Details Column */
.tn-category-badge {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--tn-primary);
  background-color: rgba(0, 210, 148, 0.1);
  border: 1px solid rgba(0, 210, 148, 0.25);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.tn-primary-heading {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.1;
  color: var(--tn-text-bright);
  margin-bottom: 1rem;
}

.tn-lead-paragraph {
  font-size: 1.1rem;
  color: var(--tn-text-muted);
  margin-bottom: 1.5rem;
}

.tn-info-card {
  background-color: var(--tn-bg-surface);
  border-left: 4px solid var(--tn-primary);
  border-radius: var(--tn-soft-radius);
  padding: 1.25rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--tn-deep-shadow);
}

.tn-card-text {
  font-size: 0.98rem;
  color: var(--tn-text-bright);
}

/* Features List Rows inside Split */
.tn-highlights-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.tn-highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  background-color: rgba(19, 27, 42, 0.6);
  border: 1px solid var(--tn-border-color);
  padding: 0.85rem 1rem;
  border-radius: var(--tn-soft-radius);
}

.tn-item-icon-wrap {
  color: var(--tn-primary);
  background-color: var(--tn-primary-glow);
  padding: 0.4rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.tn-item-content {
  display: flex;
  flex-direction: column;
}

.tn-item-title {
  font-size: 0.95rem;
  color: var(--tn-text-bright);
}

.tn-item-desc {
  font-size: 0.88rem;
  color: var(--tn-text-muted);
}

/* Guarantee Badge (Icon Left) */
.tn-trust-seal {
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--tn-bg-elevated);
  border: 1px dashed var(--tn-border-color);
  padding: 1rem;
  border-radius: var(--tn-soft-radius);
  margin-bottom: 2rem;
}

.tn-shield-icon {
  color: var(--tn-primary);
  flex-shrink: 0;
}

.tn-seal-text {
  display: flex;
  flex-direction: column;
  font-size: 0.88rem;
}

.tn-seal-text strong {
  color: var(--tn-text-bright);
}

.tn-seal-text span {
  color: var(--tn-text-muted);
}

/* Price & CTA Panel */
.tn-checkout-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  background-color: var(--tn-bg-surface);
  padding: 1.5rem;
  border-radius: var(--tn-soft-radius);
  border: 1px solid var(--tn-border-color);
  box-shadow: var(--tn-deep-shadow);
}

@media (min-width: 540px) {
  .tn-checkout-panel {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.tn-price-display {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.tn-price-label {
  font-size: 0.85rem;
  color: var(--tn-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tn-price-badge {
  background: linear-gradient(135deg, var(--tn-primary) 0%, #00a876 100%);
  padding: 0.4rem 1.1rem;
  border-radius: var(--tn-soft-radius);
  display: inline-block;
  box-shadow: 0 4px 15px var(--tn-primary-glow);
}

.tn-currency-val {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: #04120c;
  letter-spacing: 0.02em;
}

.tn-buy-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background-color: var(--tn-accent-warm);
  color: #ffffff;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  padding: 0.9rem 1.8rem;
  border-radius: var(--tn-soft-radius);
  transition: all 0.25s ease;
  box-shadow: 0 8px 20px rgba(255, 82, 99, 0.35);
}

.tn-buy-action:hover {
  background-color: #ff3348;
  transform: translateY(-2px);
  box-shadow: 0 12px 25px rgba(255, 82, 99, 0.5);
}

/* SECTION HEADINGS */
.tn-section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.tn-secondary-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--tn-text-bright);
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.tn-section-sub {
  font-size: 1rem;
  color: var(--tn-text-muted);
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* FEATURES SECTION (Horizontal rows) */
.tn-pillars-section {
  position: relative;
  z-index: 10;
  padding-top: 3rem;
  padding-bottom: 3rem;
  background-color: rgba(19, 27, 42, 0.4);
  border-top: 1px solid var(--tn-border-color);
  border-bottom: 1px solid var(--tn-border-color);
}

.tn-rows-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.tn-pillar-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background-color: var(--tn-bg-surface);
  border: 1px solid var(--tn-border-color);
  border-radius: var(--tn-soft-radius);
  padding: 1.5rem;
  box-shadow: var(--tn-deep-shadow);
  transition: transform 0.2s ease;
}

.tn-pillar-row:hover {
  transform: translateX(4px);
  border-color: rgba(0, 210, 148, 0.4);
}

.tn-pillar-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--tn-bg-elevated);
  border: 2px solid var(--tn-primary);
  color: var(--tn-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 15px var(--tn-primary-glow);
}

.tn-pillar-info {
  display: flex;
  flex-direction: column;
}

.tn-pillar-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--tn-text-bright);
  margin-bottom: 0.25rem;
}

.tn-pillar-text {
  font-size: 0.95rem;
  color: var(--tn-text-muted);
}

/* TESTIMONIALS SECTION */
.tn-opinions-section {
  position: relative;
  z-index: 10;
  padding-top: 4rem;
  padding-bottom: 2rem;
}

.tn-opinions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

.tn-opinion-card {
  background-color: var(--tn-bg-surface);
  border: 1px solid var(--tn-border-color);
  border-top: 4px solid var(--tn-primary);
  border-radius: var(--tn-soft-radius);
  padding: 1.5rem;
  box-shadow: var(--tn-deep-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.tn-opinion-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tn-avatar-circle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--tn-primary) 0%, #008f64 100%);
  color: #04120c;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tn-author-meta {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.tn-author-name {
  font-size: 1rem;
  color: var(--tn-text-bright);
  line-height: 1.2;
}

.tn-author-city {
  font-size: 0.82rem;
  color: var(--tn-text-muted);
}

.tn-star-row {
  color: #fbbf24;
  letter-spacing: 2px;
  font-size: 0.95rem;
}

.tn-opinion-quote {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--tn-text-bright);
  line-height: 1.5;
}

/* FOOTER */
.tn-bottom-bar {
  width: 100%;
  background-color: var(--tn-bg-surface);
  border-top: 1px solid var(--tn-border-color);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  position: relative;
  z-index: 20;
}

.tn-shell-footer {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

@media (min-width: 768px) {
  .tn-shell-footer {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.tn-foot-brand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tn-copyright-note {
  font-size: 0.85rem;
  color: var(--tn-text-muted);
}

.tn-foot-links-nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

@media (min-width: 768px) {
  .tn-foot-links-nav {
    align-items: flex-end;
  }
}

.tn-legal-link {
  color: var(--tn-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

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