/* ============================================================
   Stuvia India — Design System & Consolidated Styles
   ============================================================
   All styles in one file, organized by section.
   No inline <style> blocks in templates.
   ============================================================

   Table of Contents:
   1.  Design Tokens (:root custom properties)
   2.  Reset & Base
   3.  Layout (.container)
   4.  Header & Navigation
   5.  Trust Header Bar
   6.  Footer
   7.  Buttons
   8.  Cards & Badges
   9.  Forms
   10. Messages & Alerts
   11. Breadcrumbs
   12. Page: Home
   13. Page: Products Listing (pl-*)
   14. Page: Product Detail (pd-*)
   15. Page: Cart
   16. Page: Checkout
   17. Page: Orders
   18. Page: Login
   19. Page: 404
   20. Responsive Overrides

   Breakpoints (cannot use custom properties in media queries):
   --bp-tablet:  768px   (mobile nav, single-column stacking)
   --bp-desktop: 968px   (two-column layouts)
   --bp-wide:    1200px  (wider column gaps)
   ============================================================ */

/* === Design Tokens (custom properties) === */
:root {
  /* Stuvia Brand Colors (from Stuvia design framework _color-scheme.scss) */
  --brand-25: #F7FBFE;
  --brand-50: #EEF7FD;
  --brand-100: #DDF0FC;
  --brand-200: #BAE1F8;
  --brand-300: #A3D7F6;
  --brand-400: #75C3F2;
  --brand-500: #47AFED;
  --brand-600: #199BE9;
  --brand-700: #147CBA;
  --brand-800: #0F5DBC;
  --brand-900: #0A3E5D;
  --brand-950: #051F2F;

  /* Gray Scale */
  --gray-25: #FDFDFD;
  --gray-50: #FAFAFA;
  --gray-100: #F5F5F5;
  --gray-200: #E9EAEB;
  --gray-300: #D5D7DA;
  --gray-400: #A4A7AE;
  --gray-500: #717680;
  --gray-600: #535862;
  --gray-700: #414651;
  --gray-800: #252B37;
  --gray-900: #181D27;

  /* Semantic Colors */
  --success-50: #ECFDF3;
  --success-500: #17B26A;
  --success-600: #079455;
  --success-700: #067647;
  --warning-50: #FFFAEB;
  --warning-500: #F79009;
  --warning-600: #DC6803;
  --warning-700: #B54708;
  --error-50: #FEF3F2;
  --error-500: #F04438;
  --error-600: #D92D20;
  --error-700: #B42318;

  /* CTA Yellow (Stuvia's "Add to cart" button) */
  --yellow-500: #FED030;
  --yellow-600: #FEBD00;
  --yellow-700: #CB9700;

  /* WhatsApp (India-specific) */
  --whatsapp: #25D366;
  --whatsapp-dark: #128C7E;

  /* Semantic Mappings */
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-700);
  --text-tertiary: var(--gray-600);
  --text-quaternary: var(--gray-500);
  --text-disabled: var(--gray-400);
  --text-on-brand: #FFFFFF;
  --bg-primary: #FFFFFF;
  --bg-secondary: var(--gray-50);
  --bg-tertiary: var(--gray-100);
  --border-primary: var(--gray-300);
  --border-secondary: var(--gray-200);

  /* Typography */
  --font-sans: 'Onest', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.375rem;
  --space-md: 0.5rem;
  --space-lg: 0.75rem;
  --space-xl: 1rem;
  --space-2xl: 1.25rem;
  --space-3xl: 1.5rem;
  --space-4xl: 2rem;
  --space-5xl: 2.5rem;
  --space-6xl: 3rem;
  --space-7xl: 4rem;

  /* Border Radius */
  --radius-xs: 0.25rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.625rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Container */
  --container-max-width: 1400px;
  --container-padding: 1rem;
}

@media (min-width: 768px) {
  :root {
    --container-padding: 2rem;
  }
}


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

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brand-600);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}


/* === Layout === */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

main {
  min-height: calc(100vh - 200px);
}


/* === Header & Navigation === */
header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-content {
  display: flex;
  align-items: center;
  gap: var(--space-4xl);
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: var(--brand-600);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand-600);
  letter-spacing: -0.02em;
}

.search-container {
  flex: 1;
  max-width: 600px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.625rem 2.5rem 0.625rem 1rem;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: border-color 0.2s, background-color 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--brand-600);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgba(25, 155, 233, 0.1);
}

.search-input::placeholder {
  color: var(--text-quaternary);
}

.search-icon {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-quaternary);
  pointer-events: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-shrink: 0;
}

.btn-login {
  padding: 0.5rem 1.25rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-sans);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.15s;
}

.btn-login:hover {
  background: var(--bg-secondary);
  text-decoration: none;
}

/* Mobile search toggle */
.search-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: var(--space-md);
}


/* === Trust Header Bar === */
.trust-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-secondary);
}

.trust-header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) 0;
  gap: var(--space-4xl);
}

.trust-header-item {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  white-space: nowrap;
}

.trust-header-item svg {
  color: var(--success-600);
  flex-shrink: 0;
}


/* === Footer === */
footer {
  background: var(--brand-900);
  color: rgba(255, 255, 255, 0.8);
  margin-top: var(--space-7xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-4xl);
  padding: var(--space-7xl) 0 var(--space-4xl);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.footer-brand .logo-text {
  color: #FFFFFF;
  font-size: 1.5rem;
}

.footer-tagline {
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
  max-width: 280px;
}

.footer-section h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-xl);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-3xl) 0;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
}


/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-sans);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background-color 0.15s, transform 0.1s;
  line-height: 1.4;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--yellow-600);
  color: var(--gray-900);
}

.btn-primary:hover {
  background: var(--yellow-700);
}

.btn-primary:disabled {
  background: var(--gray-300);
  color: var(--text-disabled);
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
}

.btn-brand {
  background: var(--brand-600);
  color: var(--text-on-brand);
}

.btn-brand:hover {
  background: var(--brand-700);
}

.btn-whatsapp-action {
  background: var(--whatsapp);
  color: #FFFFFF;
}

.btn-whatsapp-action:hover {
  background: var(--whatsapp-dark);
}

.btn-large {
  width: 100%;
  padding: 0.875rem var(--space-3xl);
  font-size: 1rem;
}

.btn-small {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}


/* === Cards === */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
}

.card-elevated {
  box-shadow: var(--shadow-sm);
}


/* === Forms === */
.form-group {
  margin-bottom: var(--space-3xl);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-md);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--brand-600);
  box-shadow: 0 0 0 3px rgba(25, 155, 233, 0.1);
}

.form-group input::placeholder {
  color: var(--text-quaternary);
}

.form-group small {
  display: block;
  margin-top: var(--space-xs);
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}


/* === Badges & Pills === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.6;
}

.badge-brand {
  background: var(--brand-50);
  color: var(--brand-700);
}

.badge-success {
  background: var(--success-50);
  color: var(--success-700);
}

.badge-warning {
  background: var(--warning-50);
  color: var(--warning-700);
}

.badge-error {
  background: var(--error-50);
  color: var(--error-700);
}

.badge-gray {
  background: var(--gray-100);
  color: var(--text-tertiary);
}


/* === Messages / Alerts === */
.message {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-top: var(--space-3xl);
  text-align: center;
  display: none;
  font-weight: 500;
  font-size: 0.875rem;
}

.message.success {
  background: var(--success-50);
  color: var(--success-700);
  border: 1px solid var(--success-500);
  display: block;
}

.message.error {
  background: var(--error-50);
  color: var(--error-700);
  border: 1px solid var(--error-500);
  display: block;
}


/* === Breadcrumbs === */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-3xl) 0;
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb a::after {
  content: "›";
  margin-left: var(--space-md);
  color: var(--text-quaternary);
}

.breadcrumb-separator {
  margin: 0 var(--space-md);
  color: var(--text-quaternary);
}


/* === Page: Home === */
.hero {
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: var(--space-7xl) 0;
  text-align: center;
  border-bottom: 1px solid var(--border-secondary);
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4xl);
}

.hero-cta {
  display: inline-flex;
  padding: 0.875rem 2.5rem;
  font-size: 1rem;
}

.features {
  padding: var(--space-7xl) 0;
}

.features h2 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-6xl);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4xl);
}

.feature-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-4xl);
  text-align: center;
  transition: box-shadow 0.2s;
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-3xl);
  background: var(--brand-50);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-tertiary);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Trust stats horizontal bar */
.trust-stats {
  padding: var(--space-5xl) 0;
}

.trust-stats-inner {
  display: flex;
  justify-content: center;
  gap: var(--space-5xl);
  padding: var(--space-4xl) var(--space-3xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
}

.trust-stat {
  text-align: center;
}

.trust-stat-value {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.trust-stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.whatsapp-cta {
  padding: var(--space-5xl) 0;
}

.whatsapp-content {
  background: var(--whatsapp);
  border-radius: var(--radius-xl);
  padding: var(--space-6xl) var(--space-4xl);
  text-align: center;
  color: #FFFFFF;
}

.whatsapp-content svg {
  margin-bottom: var(--space-3xl);
}

.whatsapp-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
}

.whatsapp-content p {
  font-size: 1rem;
  margin-bottom: var(--space-4xl);
  opacity: 0.9;
}

.btn-whatsapp-join {
  display: inline-flex;
  align-items: center;
  padding: 0.875rem 2rem;
  background: #FFFFFF;
  color: var(--whatsapp);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s;
}

.btn-whatsapp-join:hover {
  background: var(--gray-50);
  text-decoration: none;
}


/* === Page: Products === */
.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.page-subtitle {
  color: var(--text-tertiary);
  margin-bottom: var(--space-4xl);
  font-size: 0.9375rem;
}

.page-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-4xl);
  padding: var(--space-4xl) 0;
}

.filters {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  padding: var(--space-3xl);
  border-radius: var(--radius-xl);
  height: fit-content;
  position: sticky;
  top: 80px;
}

.filters h3 {
  margin-bottom: var(--space-xl);
  font-size: 0.9375rem;
  color: var(--text-primary);
  font-weight: 600;
}

.filter-list {
  list-style: none;
}

.filter-list li {
  margin-bottom: var(--space-xs);
}

.filter-link {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s, color 0.15s;
  font-size: 0.875rem;
}

.filter-link:hover {
  background: var(--brand-50);
  color: var(--brand-600);
  text-decoration: none;
}

.filter-link.active {
  background: var(--brand-50);
  color: var(--brand-600);
  font-weight: 600;
}

.results-count {
  color: var(--text-tertiary);
  margin-bottom: var(--space-3xl);
  font-size: 0.875rem;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-3xl);
}

.product-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.product-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--border-primary);
}

.product-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
}

.product-subject {
  background: var(--brand-50);
  color: var(--brand-700);
  padding: 0.1875rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
}

.product-pages {
  color: var(--text-quaternary);
  font-size: 0.8125rem;
}

.product-card .product-title {
  font-size: 1rem;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.4;
}

.product-description {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-secondary);
}

.product-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.no-results {
  text-align: center;
  padding: var(--space-7xl) var(--space-4xl);
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
}

.no-results p {
  color: var(--text-tertiary);
  font-size: 1rem;
  margin-bottom: var(--space-3xl);
}


/* === Page: Product Detail (pd-*) === */

/* Two-column layout (matches Stuvia's .columns-container) */
.pd-columns {
  display: flex;
  flex-direction: column;
  gap: var(--space-5xl);
  padding: var(--space-3xl) 0 var(--space-7xl);
}

.pd-col-left {
  min-width: 0;
}

.pd-col-right {
  width: 100%;
}

/* Title section */
.pd-type-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xs);
}

.pd-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
}

/* Statistics bar (matches Stuvia's .statistics-container) */
.pd-stats-bar {
  display: flex;
  gap: var(--space-2xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-2xl);
  margin-bottom: var(--space-3xl);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.pd-stats-bar span + span {
  padding-left: var(--space-2xl);
  border-left: 1px solid var(--border-primary);
}

/* Document preview */
.pd-preview {
  margin-bottom: var(--space-4xl);
}

.pd-preview-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-secondary);
}

.pd-preview-placeholder {
  background: var(--bg-secondary);
  border: 2px dashed var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-6xl) var(--space-xl);
  text-align: center;
  color: var(--text-quaternary);
  font-size: 0.875rem;
}

.pd-preview-placeholder svg {
  margin-bottom: var(--space-xl);
}

/* Description */
.pd-description {
  margin-bottom: var(--space-4xl);
}

.pd-section-heading {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.pd-description p {
  line-height: 1.7;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Info table rows (matches Stuvia's .info-table-row) */
.pd-info-rows {
  margin-bottom: var(--space-4xl);
}

.pd-info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg) var(--space-2xl);
  font-size: 0.875rem;
}

.pd-info-row:nth-child(odd) {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.pd-info-label {
  color: var(--text-quaternary);
  font-weight: 500;
}

.pd-info-value {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Sidebar sticky wrapper */
.pd-sidebar-sticky {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

/* Price & CTA card */
.pd-price-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
}

.pd-price {
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3xl);
  letter-spacing: -0.02em;
}

.btn-add-to-cart {
  width: 100%;
  background: var(--yellow-600);
  color: var(--gray-900);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-3xl);
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  transition: background-color 0.15s;
}

.btn-add-to-cart:hover {
  background: var(--yellow-700);
}

.pd-price-note {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-top: var(--space-lg);
  text-align: center;
}

/* Seller card */
.pd-seller-card {
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
}

.pd-seller-heading {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
}

.pd-seller-profile {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.pd-seller-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--brand-100);
  color: var(--brand-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.pd-seller-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  min-width: 0;
}

.pd-seller-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.pd-seller-meta {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* WhatsApp support */
.pd-support {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.pd-support-label {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.btn-whatsapp-chat {
  background: var(--whatsapp);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.5rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  width: fit-content;
  text-decoration: none;
  transition: background-color 0.15s;
}

.btn-whatsapp-chat:hover {
  background: var(--whatsapp-dark);
  text-decoration: none;
  color: #FFFFFF;
}

/* Desktop: two-column layout */
@media (min-width: 968px) {
  .pd-columns {
    flex-direction: row;
    gap: var(--space-4xl);
  }

  .pd-col-left {
    flex: 1;
  }

  .pd-col-right {
    width: 384px;
    flex-shrink: 0;
  }

  .pd-sidebar-sticky {
    position: sticky;
    top: 100px;
    padding-top: var(--space-3xl);
    margin-top: calc(-1 * var(--space-3xl));
  }

  .pd-title {
    font-size: 1.75rem;
  }
}

@media (min-width: 1200px) {
  .pd-columns {
    gap: var(--space-7xl);
  }
}


/* === Page: Cart === */
.cart-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: var(--space-4xl);
  padding: var(--space-4xl) 0;
}

.cart-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.cart-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
}

.cart-item .item-info h3 {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
}

.item-meta {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
  margin-bottom: var(--space-xl);
}

.item-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}

.quantity-control {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.quantity-input {
  width: 56px;
  padding: 0.375rem;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.875rem;
  font-family: var(--font-sans);
}

.item-price {
  margin-left: auto;
}

.item-price .price {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.btn-remove {
  background: none;
  border: none;
  color: var(--error-500);
  cursor: pointer;
  font-size: 0.8125rem;
  font-family: var(--font-sans);
  padding: var(--space-md);
}

.btn-remove:hover {
  color: var(--error-700);
  text-decoration: underline;
}

.cart-summary {
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-4xl);
  height: fit-content;
  position: sticky;
  top: 80px;
}

.cart-summary h2 {
  margin-bottom: var(--space-3xl);
  font-size: 1.25rem;
  font-weight: 700;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-secondary);
  font-size: 0.9375rem;
}

.total-row {
  border-bottom: none;
  border-top: 2px solid var(--brand-600);
  margin-top: var(--space-md);
  font-size: 1.125rem;
  font-weight: 700;
  padding-top: var(--space-xl);
}

.cart-summary .btn {
  margin-top: var(--space-xl);
}

.cart-trust-text {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xl);
}

.empty-cart,
.empty-orders {
  text-align: center;
  padding: var(--space-7xl) var(--space-4xl);
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  margin: var(--space-4xl) 0;
}

.empty-cart h2,
.empty-orders h2 {
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
  font-size: 1.25rem;
}

.empty-cart p,
.empty-orders p {
  color: var(--text-tertiary);
  margin-bottom: var(--space-4xl);
}


/* === Page: Checkout === */
.checkout-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-4xl);
  padding: var(--space-4xl) 0;
}

.order-summary {
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  padding: var(--space-4xl);
  border-radius: var(--radius-xl);
}

.order-summary h2 {
  margin-bottom: var(--space-3xl);
  font-size: 1.25rem;
  font-weight: 700;
}

.order-items {
  margin-bottom: var(--space-4xl);
}

.order-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--border-secondary);
}

.order-item:last-child {
  border-bottom: none;
}

.item-details h4 {
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.item-quantity {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.checkout-layout .item-price {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.9375rem;
  margin-left: 0;
}

.discount-section {
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--border-secondary);
  margin-bottom: var(--space-3xl);
}

.discount-section h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: var(--space-xl);
}

.discount-input-group {
  display: flex;
  gap: var(--space-md);
}

.discount-input-group input {
  flex: 1;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: var(--font-sans);
}

.discount-input-group input:focus {
  outline: none;
  border-color: var(--brand-600);
  box-shadow: 0 0 0 3px rgba(25, 155, 233, 0.1);
}

.discount-input-group button {
  padding: 0.625rem 1.25rem;
}

#discount-message {
  margin-top: var(--space-md);
  font-size: 0.8125rem;
}

#discount-message.success {
  color: var(--success-600);
}

#discount-message.error {
  color: var(--error-600);
}

.total-section {
  padding-top: var(--space-xl);
}

.total-section .total-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  font-size: 0.9375rem;
}

.discount-row {
  color: var(--success-600);
}

.final-total {
  border-top: 2px solid var(--brand-600);
  margin-top: var(--space-md);
  font-size: 1.25rem;
  font-weight: 700;
  padding-top: var(--space-xl);
}

.payment-section {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-4xl);
  height: fit-content;
  position: sticky;
  top: 80px;
}

.payment-section h2 {
  margin-bottom: var(--space-xl);
  font-size: 1.25rem;
  font-weight: 700;
}

.payment-note {
  color: var(--text-tertiary);
  font-size: 0.875rem;
  margin-bottom: var(--space-4xl);
  line-height: 1.6;
}

.checkout-trust-text {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: var(--space-3xl);
  padding-top: var(--space-3xl);
  border-top: 1px solid var(--border-secondary);
}


/* === Page: Orders === */
.orders-list {
  margin: var(--space-4xl) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.order-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-4xl);
}

.order-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--border-secondary);
  margin-bottom: var(--space-3xl);
}

.order-info h3 {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
}

.order-date {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.order-status {
  text-align: right;
}

.status-badge {
  display: inline-block;
  padding: 0.1875rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.status-pending {
  background: var(--warning-50);
  color: var(--warning-700);
}

.status-completed {
  background: var(--success-50);
  color: var(--success-700);
}

.status-failed {
  background: var(--error-50);
  color: var(--error-700);
}

.order-total {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.order-card .order-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  margin-bottom: 0;
}

.order-card .order-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border-bottom: none;
}

.order-card .order-item h4 {
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.order-card .order-item p {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.order-discount {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--success-50);
  color: var(--success-700);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
}

.order-transaction {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--brand-50);
  color: var(--brand-800);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
}


/* === Page: Login === */
.login-container {
  max-width: 440px;
  margin: var(--space-7xl) auto;
  padding: var(--space-5xl);
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.login-container h1 {
  text-align: center;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.login-subtitle {
  text-align: center;
  color: var(--text-tertiary);
  margin-bottom: var(--space-5xl);
  font-size: 0.875rem;
}

.login-step {
  margin-bottom: var(--space-3xl);
}

.otp-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.otp-info .timer {
  color: var(--warning-600);
  font-weight: 600;
}

.otp-info .attempts {
  color: var(--text-tertiary);
}

.otp-info .attempts.warning {
  color: var(--error-600);
  font-weight: 600;
}

.login-trust-text {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xl);
}


/* === Page: 404 === */
.error-page {
  text-align: center;
  padding: var(--space-7xl) var(--space-4xl);
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.error-page h1 {
  font-size: 8rem;
  color: var(--brand-100);
  margin-bottom: var(--space-xl);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
}

.error-actions {
  display: flex;
  gap: var(--space-xl);
  justify-content: center;
}

.error-page h2 {
  font-size: 1.75rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  font-weight: 700;
}

.error-page p {
  font-size: 1rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-5xl);
  max-width: 420px;
  line-height: 1.6;
}


/* === Responsive === */
@media (max-width: 968px) {
  /* Stacked layouts */
  .page-layout,
  .cart-layout,
  .checkout-layout {
    grid-template-columns: 1fr;
  }

  .filters,
  .cart-summary,
  .payment-section {
    position: static;
  }

  .login-container {
    margin: var(--space-4xl) var(--space-xl);
    padding: var(--space-4xl) var(--space-3xl);
  }

  .login-container h1 {
    font-size: 1.25rem;
  }

  .order-header {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .order-status {
    text-align: left;
  }

  .order-card .order-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xl);
  }

  .item-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .item-price {
    margin-left: 0;
  }

  /* Footer responsive */
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  /* Trust header: scroll horizontally on mobile */
  .trust-header-content {
    justify-content: flex-start;
    gap: var(--space-3xl);
    padding: var(--space-xs) 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .trust-header-content::-webkit-scrollbar {
    display: none;
  }

  .trust-header-item {
    font-size: 0.6875rem;
  }

  /* Header: hide search, show toggle */
  .search-container {
    display: none;
  }

  .search-toggle {
    display: block;
  }

  .search-container.active {
    display: block;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    padding: var(--space-xl) var(--container-padding);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-secondary);
    z-index: 99;
  }

  /* Hero responsive */
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 0.875rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .trust-stats-inner {
    flex-direction: column;
    gap: var(--space-3xl);
    padding: var(--space-3xl);
  }

  .whatsapp-content {
    padding: var(--space-4xl) var(--space-3xl);
  }

  .whatsapp-content h2 {
    font-size: 1.25rem;
  }

  /* Products: hide sidebar, full-width grid */
  .page-layout {
    grid-template-columns: 1fr;
  }

  .filters {
    position: static;
  }

  .error-page h1 {
    font-size: 4rem;
  }

  .error-page h2 {
    font-size: 1.25rem;
  }

  /* Products grid single column */
  .products-grid {
    grid-template-columns: 1fr;
  }

  .page-title {
    font-size: 1.5rem;
  }

  /* Footer responsive */
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-4xl);
  }
}