/* ==========================================================================
   FrankBase Store — Modern Design System (WCAG 2.1 AA Compliant)
   Strict Semantic CSS Variables for Day/Night Theme (Invariant #11)
   ========================================================================== */

:root,
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-input: #ffffff;
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --brand-primary: #2563eb;
  --brand-primary-hover: #1d4ed8;
  --brand-accent: #f59e0b;
  --brand-accent-hover: #d97706;
  --brand-green: #16a34a;
  --brand-green-bg: rgba(22, 163, 74, 0.1);

  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #3b82f6;

  --badge-bg: #eff6ff;
  --badge-text: #1d4ed8;
  --badge-gold-bg: #fef3c7;
  --badge-gold-text: #92400e;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.05);

  --modal-overlay: rgba(15, 23, 42, 0.65);
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-surface: #0f172a;
  --bg-card: #131d31;
  --bg-card-hover: #1a2742;
  --bg-glass: rgba(15, 23, 42, 0.9);
  --bg-input: #1e293b;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --brand-primary: #3b82f6;
  --brand-primary-hover: #60a5fa;
  --brand-accent: #fbbf24;
  --brand-accent-hover: #f59e0b;
  --brand-green: #22c55e;
  --brand-green-bg: rgba(34, 197, 94, 0.15);

  --border-color: #1e293b;
  --border-hover: #334155;
  --border-focus: #60a5fa;

  --badge-bg: #1e3a8a;
  --badge-text: #93c5fd;
  --badge-gold-bg: #78350f;
  --badge-gold-text: #fde68a;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.6), 0 4px 6px -4px rgb(0 0 0 / 0.4);

  --modal-overlay: rgba(0, 0, 0, 0.85);
}

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

html {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--brand-primary-hover);
}

code, pre {
  font-family: 'JetBrains Mono', monospace;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.35rem;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
  user-select: none;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--brand-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--text-inverse);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-card-hover);
  border-color: var(--brand-primary);
}

.btn-sm {
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
  border-radius: 8px;
}

.btn-lg {
  padding: 0.9rem 1.8rem;
  font-size: 1.05rem;
  border-radius: 12px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid transparent;
  width: fit-content;
}

.badge-gold {
  background-color: var(--badge-gold-bg);
  color: var(--badge-gold-text);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.brand-logo .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.brand-name {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.brand-name span {
  color: var(--brand-primary);
}

.brand-tag {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  margin-left: 0.35rem;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-toggle,
.currency-toggle {
  display: inline-flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.2rem;
  font-size: 0.8rem;
  font-weight: 700;
}

.lang-btn,
.currency-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.78rem;
  transition: all 0.2s ease;
}

.lang-btn.active,
.currency-btn.active {
  background: var(--brand-primary);
  color: #fff;
}
  background: var(--brand-primary);
  color: #fff;
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-surface);
  padding: 1.5rem;
  flex-direction: column;
  gap: 1.25rem;
  z-index: 99;
  border-top: 1px solid var(--border-color);
  overflow-y: auto;
}

.mobile-drawer.open {
  display: flex;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.hero-inner {
  max-width: 820px;
  margin: 0 auto;
}

.hero-badge-wrap {
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--brand-primary), #6366f1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2rem;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.trust-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
}

.trust-item span {
  font-size: 1.2rem;
}

/* ==========================================================================
   Category Filter Tabs
   ========================================================================== */
.category-nav {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 72px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  z-index: 90;
}

.category-pills {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: none;
}

.category-pills::-webkit-scrollbar {
  display: none;
}

.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s ease;
}

.pill-btn:hover, .pill-btn.active {
  background: var(--brand-primary);
  color: #fff;
  border-color: var(--brand-primary);
}

/* ==========================================================================
   Product Grid & Cards
   ========================================================================== */
.product-grid-section {
  padding: 3.5rem 0;
}

.section-header {
  margin-bottom: 2.25rem;
}

.section-header h2 {
  font-size: 1.85rem;
  margin-bottom: 0.4rem;
}

.section-header p {
  color: var(--text-muted);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

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

.product-card-top {
  padding: 1.5rem 1.5rem 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.product-card-body {
  padding: 0 1.5rem 1.25rem;
  flex: 1;
}

.product-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  line-height: 1.35;
}

.product-card-title a {
  color: var(--text-primary);
}

.product-card-title a:hover {
  color: var(--brand-primary);
}

.product-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.product-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.meta-chip {
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--bg-card-hover);
  color: var(--text-muted);
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.product-card-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.price-box {
  display: flex;
  flex-direction: column;
}

.price-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
}

.price-val {
  font-size: 1.4rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  color: var(--text-primary);
}

.card-actions {
  display: flex;
  gap: 0.5rem;
}

/* ==========================================================================
   Modals (Free Sample Preview & Consent Checkbox)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--modal-overlay);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.modal-backdrop.active {
  display: flex;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  max-width: 650px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.35rem;
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 1.75rem;
  flex: 1;
}

/* Checkbox Consent Container */
.consent-box-container {
  background: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.consent-box-container p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.consent-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  user-select: none;
}

.consent-checkbox-label input[type="checkbox"] {
  margin-top: 0.2rem;
  width: 18px;
  height: 18px;
  accent-color: var(--brand-primary);
  cursor: pointer;
}

/* ==========================================================================
   WhatsApp Banner Card & Community
   ========================================================================== */
.whatsapp-cta-card {
  background: var(--brand-green-bg);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin: 3.5rem 0;
}

.whatsapp-cta-text h4 {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.whatsapp-cta-text p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

.btn-whatsapp {
  background-color: var(--brand-green);
  color: #ffffff !important;
  font-weight: 700;
}

.btn-whatsapp:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 0.75rem;
  margin-bottom: 1.25rem;
}

.footer-social-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.social-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: all 0.2s ease;
}

.social-icon-btn:hover {
  background: var(--brand-primary);
  color: #fff;
  border-color: var(--brand-primary);
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--brand-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-legal-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-legal-nav a {
  color: var(--text-muted);
}

.footer-legal-nav a:hover {
  color: var(--brand-primary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-section {
    padding: 3rem 0 2rem;
  }
  .trust-strip {
    gap: 1.25rem;
  }
}