/* ==========================================================================
   Ray-Ban Meta Spin View Converter - Production Stylesheet
   Brand Identity:
   - Primary: #FB0000 (Red)
   - Neutrals: #171717 (Near-black), #6B7280 (Muted), #F8F9FA (Background), #FFFFFF (Surface)
   - 8px Grid Spacing (8, 16, 24, 32, 48, 64px)
   - Corner Radius: 12px cards/buttons, 8px chips/inputs
   ========================================================================== */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  --color-primary: #FB0000;
  --color-primary-hover: #D90000;
  --color-primary-active: #B50000;
  --color-primary-subtle: rgba(251, 0, 0, 0.08);
  --color-primary-border: rgba(251, 0, 0, 0.25);
  
  --color-bg: #F8F9FA;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F3F4F6;
  --color-border: #E5E7EB;
  --color-border-hover: #D1D5DB;
  
  --color-text-main: #171717;
  --color-text-muted: #6B7280;
  --color-text-subtle: #9CA3AF;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px -4px rgba(0, 0, 0, 0.08), 0 4px 10px -2px rgba(0, 0, 0, 0.04);
  --shadow-header-scrolled: 0 4px 20px rgba(0, 0, 0, 0.08);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 48px;
}

@media (max-width: 900px) {
  .container {
    padding: 0 24px;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }
}

/* ==========================================================================
   Top Navigation Bar
   ========================================================================== */
.top-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.top-header.scrolled {
  box-shadow: var(--shadow-header-scrolled);
}

.nav-content {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Left Brand Lockup */
.brand-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  flex-shrink: 0;
  display: block;
}

.brand-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-text-main);
  letter-spacing: -0.015em;
  white-space: nowrap;
}

/* Divider & Co-Brand logo on desktop */
.brand-divider {
  width: 1px;
  height: 24px;
  background-color: var(--color-border);
  margin: 0 4px;
}

.co-brand-tag {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-subtle);
  margin-right: 2px;
}

.co-brand-logo-img {
  height: 30px;
  width: auto;
  max-width: 110px;
  border-radius: 6px;
  display: block;
  object-fit: contain;
}

/* Right Nav Actions (Desktop) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Nav Convert Button */
.btn-nav-primary {
  padding: 8px 18px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(251, 0, 0, 0.28);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-nav-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(251, 0, 0, 0.35);
}

/* Mobile Hamburger Button */
.hamburger-btn {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 42px;
  height: 42px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  color: var(--color-text-main);
  transition: background-color var(--transition-fast);
}

.hamburger-btn:hover {
  background-color: var(--color-surface-hover);
}

/* ==========================================================================
   Mobile Slide-in Drawer & Scrim
   ========================================================================== */
.drawer-scrim {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease-out;
}

.drawer-scrim.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 80%;
  max-width: 320px;
  background-color: var(--color-surface);
  z-index: 210;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
  transform: translateX(100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px 20px;
  overflow-y: auto;
}

.drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.drawer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
}

.drawer-close-btn {
  background: none;
  border: none;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-main);
  transition: background var(--transition-fast);
}

.drawer-close-btn:hover {
  background-color: var(--color-surface-hover);
}

.drawer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  margin-top: 16px;
}

.drawer-nav-item {
  border-bottom: 1px solid var(--color-border);
}

.drawer-nav-link {
  display: flex;
  align-items: center;
  height: 52px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-main);
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.drawer-nav-link:hover {
  color: var(--color-primary);
  padding-left: 6px;
}

.drawer-cta {
  margin-top: 24px;
}

.drawer-cta .btn-primary {
  width: 100%;
}

.drawer-footer {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.drawer-co-brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Responsive Top Bar Breakpoint (≤768px) */
@media (max-width: 768px) {
  .nav-actions,
  .brand-divider,
  .co-brand-tag,
  .co-brand-logo-img {
    display: none;
  }
  .hamburger-btn {
    display: flex;
  }
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
main {
  flex: 1;
}

.tool-wrapper {
  max-width: 760px;
  margin: 0 auto;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 48px 0 32px 0;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-subtle);
  border: 1px solid var(--color-primary-border);
  color: var(--color-primary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  color: var(--color-text-main);
}

.hero p {
  font-size: 1.08rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

@media (max-width: 640px) {
  .hero {
    padding: 32px 0 24px 0;
  }
  .hero h1 {
    font-size: 1.85rem;
  }
  .hero p {
    font-size: 0.96rem;
  }
}

/* ==========================================================================
   Cards & Interactive Panels
   ========================================================================== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 32px;
  margin-bottom: 24px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

@media (max-width: 640px) {
  .card {
    padding: 20px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
  }
}

/* Inline UI Error Alert */
.error-banner {
  background-color: #FEF2F2;
  border: 1px solid #FCA5A5;
  color: #991B1B;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  margin-bottom: 20px;
  text-align: center;
  font-weight: 500;
  line-height: 1.5;
}

/* Quick Action Buttons */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.btn-quick {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-main);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-quick svg {
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.btn-quick:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
  transform: translateY(-2px);
}

.btn-quick:hover svg {
  transform: scale(1.1);
}

@media (max-width: 480px) {
  .quick-actions {
    gap: 8px;
  }
  .btn-quick {
    padding: 10px 6px;
    font-size: 0.78rem;
  }
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--color-bg);
  position: relative;
  outline: none;
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone.drag-active {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
  transform: scale(1.005);
}

.drop-icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px auto;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.drop-zone:hover .drop-icon-wrapper {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

.drop-title {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.drop-subtext {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 18px;
}

.drop-formats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.format-chip {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.sample-trigger-row {
  margin-top: 16px;
  text-align: center;
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: opacity var(--transition-fast);
}

.btn-text:hover {
  text-decoration: underline;
  opacity: 0.9;
}

/* ==========================================================================
   Processing & Result Panels
   ========================================================================== */
.processing-overlay {
  text-align: center;
  padding: 48px 24px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.result-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.result-preview-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000000;
  aspect-ratio: 3 / 4;
  max-width: 360px;
  width: 100%;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.result-preview-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.preview-badge-overlay {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(23, 23, 23, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #FFFFFF;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* Info Chips Grid */
.info-chips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.info-chip {
  padding: 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chip-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  font-weight: 700;
}

.chip-value {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.chip-value.highlight {
  color: var(--color-primary);
}

@media (max-width: 520px) {
  .info-chips-grid {
    grid-template-columns: 1fr;
  }
}

/* Action Buttons */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-primary {
  width: 100%;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(251, 0, 0, 0.32);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(251, 0, 0, 0.4);
}

.btn-secondary {
  width: 100%;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

/* ==========================================================================
   Supporting Content Sections
   ========================================================================== */
.section-header {
  margin-bottom: 20px;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.section-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 3-Step Guide */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.step-number {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.step-body h4 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.step-body p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Comparison Table */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

th, td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg);
  font-weight: 700;
  color: var(--color-text-main);
}

tr:last-child td {
  border-bottom: none;
}

.col-feature {
  font-weight: 600;
  color: var(--color-text-main);
}

.col-highlight {
  color: var(--color-primary);
  font-weight: 700;
  background: var(--color-primary-subtle);
}

/* Bullet Items */
.bullet-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.bullet-icon {
  color: var(--color-primary);
  margin-top: 2px;
  flex-shrink: 0;
}

.bullet-text strong {
  color: var(--color-text-main);
  display: block;
  font-size: 0.98rem;
  margin-bottom: 3px;
}

.bullet-text p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

details.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  transition: all var(--transition-fast);
  overflow: hidden;
}

details.faq-item[open] {
  border-color: var(--color-primary-border);
  background: var(--color-surface);
}

summary.faq-summary {
  padding: 16px 20px;
  font-weight: 700;
  font-size: 0.96rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  color: var(--color-text-main);
}

summary.faq-summary::-webkit-details-marker {
  display: none;
}

summary.faq-summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

details.faq-item[open] summary.faq-summary::after {
  content: "−";
  color: var(--color-primary);
}

.faq-content {
  padding: 0 20px 18px 20px;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 56px 0 40px 0;
  margin-top: 56px;
}

.footer-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 40px;
}

.footer-lockup {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-divider {
  width: 1px;
  height: 24px;
  background-color: var(--color-border);
}

.footer-co-brand-logo {
  height: 32px;
  width: auto;
  border-radius: 6px;
  object-fit: contain;
}

.footer-tagline {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  max-width: 600px;
}

/* Multi-column Business Footer Grid */
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr;
  gap: 32px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 28px;
  text-align: left;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-main);
  margin-bottom: 16px;
}

.footer-about-text {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.footer-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.footer-disclaimer {
  font-size: 0.8rem;
  color: var(--color-text-subtle);
  line-height: 1.6;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

/* ==========================================================================
   Topical Guides & Content Hub Cards
   ========================================================================== */
.guides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.guide-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-normal);
}

.guide-card:hover {
  background: var(--color-surface);
  border-color: var(--color-primary-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.guide-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.guide-card-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.guide-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.guide-card-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  flex-grow: 1;
  margin-bottom: 12px;
}

.guide-card-action {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   Breadcrumb Navigation
   ========================================================================== */
.breadcrumb-nav {
  margin-bottom: 24px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-size: 0.86rem;
  color: var(--color-text-subtle);
}

.breadcrumb-item a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--color-primary);
}

.breadcrumb-separator {
  color: var(--color-text-subtle);
  font-size: 0.75rem;
}

.breadcrumb-current {
  color: var(--color-text-main);
  font-weight: 600;
}

/* ==========================================================================
   Article & Longform Guide Pages
   ========================================================================== */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 0;
}

.article-hero {
  margin-bottom: 32px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

@media (max-width: 640px) {
  .article-title {
    font-size: 1.7rem;
  }
}

.article-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--color-text-subtle);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.article-body {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-main);
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin: 36px 0 14px 0;
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin: 28px 0 10px 0;
}

.article-body p {
  margin-bottom: 18px;
  color: #374151;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 24px;
}

.article-body li {
  margin-bottom: 8px;
  color: #374151;
}

.article-callout {
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: var(--color-primary-subtle);
  border-left: 4px solid var(--color-primary);
  margin: 24px 0;
}

.article-callout-title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
  font-size: 1.02rem;
}

.article-callout p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--color-text-main);
}

.article-cta-box {
  background: var(--color-surface);
  border: 2px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
  box-shadow: var(--shadow-md);
}

.article-cta-box h3 {
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.article-cta-box p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   AdSense Placement Containers (Non-Intrusive & Accessible)
   ========================================================================== */
.adsense-slot-wrapper {
  margin: 32px 0;
  width: 100%;
  display: flex;
  justify-content: center;
  overflow: hidden;
}

.adsense-slot-placeholder {
  width: 100%;
  max-width: 728px;
  min-height: 90px;
  border-radius: var(--radius-sm);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Accessibility Focus States */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Utility */
.hidden {
  display: none !important;
}