/* ==========================================================================
   TICK TICK DONE — Light & Vibrant Premium Stylesheet
   Typography: Plus Jakarta Sans (headings) + Inter (body)
   Palette: Pure white base, emerald primary, vibrant category accents
   Version: 3.0.0
   ========================================================================== */

/* ==========================================================================
   01. DESIGN TOKENS
   ========================================================================== */
:root {
  /* Brand — Fresh Emerald */
  --color-primary: #10b981;
  --color-primary-dark: #059669;
  --color-primary-light: #a7f3d0;
  --color-primary-bg: #ecfdf5;

  /* Neutral — Pure white base */
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-surface-raised: #f8fafc;
  --color-text: #0f172a;
  --color-text-secondary: #64748b;
  --color-text-tertiary: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  /* Vibrant Priority Badges */
  --color-high: #ef4444;
  --color-high-bg: #fef2f2;
  --color-medium: #f59e0b;
  --color-medium-bg: #fffbeb;
  --color-low: #6366f1;
  --color-low-bg: #eef2ff;

  /* Elevation — Softer, light-appropriate shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.03);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.03);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.06), 0 4px 10px -4px rgba(0,0,0,0.03);
  --shadow-xl: 0 20px 40px -8px rgba(0,0,0,0.08);

  /* Radius — Friendly rounded corners */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration: 200ms;
  --duration-slow: 350ms;

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Layout */
  --header-height: 64px;
  --container-max: 1200px;
  --container-padding: 1.5rem;
}

/* ==========================================================================
   02. DARK MODE
   ========================================================================== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0c0c0c;
    --color-surface: #171717;
    --color-surface-raised: #1c1c1c;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-tertiary: #64748b;
    --color-border: #2a2a2a;
    --color-border-light: #1e1e1e;
    --color-primary-bg: #052e16;
    --color-primary-light: #065f46;
    --color-high-bg: #3b1111;
    --color-medium-bg: #3b2506;
    --color-low-bg: #1e1b4b;
  }
}

/* ==========================================================================
   03. RESET & BASE TYPOGRAPHY
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 15px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  font-size: 15px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Custom Scrollbars */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background-color: var(--color-border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-text-tertiary);
}

/* App Shell */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#main-content {
  flex: 1 0 auto;
  outline: none;
}

/* ==========================================================================
   04. APP HEADER & CONTAINER
   ========================================================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.header-brand-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  min-width: 0;
}

/* Logo */
.app-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
  transition: opacity var(--duration) var(--ease);
}
.app-logo:hover {
  opacity: 0.85;
}
.app-logo .logo-icon {
  display: none !important;
}

.logo-mark {
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  display: inline-block;
  flex-shrink: 0;
}

.app-logo:not(:has(.logo-mark))::before {
  content: '';
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  display: inline-block;
  flex-shrink: 0;
}

.logo-text {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
  white-space: nowrap;
}

/* Breadcrumb Navigation */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb-link {
  color: var(--color-text-secondary);
  transition: color var(--duration) var(--ease);
}
.breadcrumb-link:hover {
  color: var(--color-text);
  text-decoration: underline;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.breadcrumb-separator {
  color: var(--color-text-tertiary);
  font-size: 0.75rem;
  user-select: none;
}

/* ==========================================================================
   05. SEARCH CONTAINER & AUTOCOMPLETE
   ========================================================================== */
.search-container {
  position: relative;
  flex-shrink: 0;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  font-size: 13px;
  line-height: 1;
}

.search-icon svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 1.75;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.search-input {
  width: 260px;
  height: 38px;
  padding: 0 1rem 0 36px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              background-color var(--duration) var(--ease),
              width var(--duration) var(--ease);
}

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

.search-input:focus {
  width: 300px;
  border-color: var(--color-primary);
  background-color: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.1);
  outline: none;
}

/* Autocomplete Dropdown */
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 360px;
  max-height: 400px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
  z-index: 200;
  animation: fadeIn var(--duration) var(--ease);
}

.search-results[hidden] {
  display: none !important;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  cursor: pointer;
  border-bottom: 1px solid var(--color-border-light);
  background-color: var(--color-surface);
  transition: background-color var(--duration) var(--ease);
}
.search-result-item:last-child {
  border-bottom: none;
}
.search-result-item:hover,
.search-result-item:focus {
  background-color: var(--color-bg);
  outline: none;
}

.search-result-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1;
}

.search-result-icon svg {
  width: 18px;
  height: 18px;
  stroke: var(--color-text-secondary);
  stroke-width: 1.75;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.search-result-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.search-result-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.35;
}

.search-result-category {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-top: 0.15rem;
}

/* ==========================================================================
   06. HERO SECTION
   ========================================================================== */
.hero {
  background-color: var(--color-primary-bg);
  padding: 4rem 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
  text-align: center;
}

.hero-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-xs);
  user-select: none;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.hero h1 .highlight {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-primary-light);
  text-underline-offset: 4px;
}

.hero p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  max-width: 520px;
  margin: 0 auto;
}

/* ==========================================================================
   07. CONTAINER & SECTION HEADERS
   ========================================================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 2.5rem var(--container-padding);
  width: 100%;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.75rem;
  gap: 1rem;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.25;
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
  line-height: 1.5;
}

/* ==========================================================================
   08. CATEGORIES GRID & CATEGORY CARDS
   ========================================================================== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.category-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  text-align: left;
  user-select: none;
  transition: all var(--duration) var(--ease);
}

.category-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1 !important;
}

@media (prefers-color-scheme: dark) {
  .category-card:hover {
    border-color: #3f3f46 !important;
  }
}

.category-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

/* Card Icon Box (Inline SVGs) */
.card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  background-color: var(--color-primary-bg);
  color: var(--color-primary);
  font-size: 1.25rem;
  line-height: 1;
  transition: transform var(--duration) var(--ease);
}

.category-card:hover .card-icon,
.product-card:hover .card-icon {
  transform: scale(1.05);
}

.card-icon svg {
  width: 22px;
  height: 22px;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.card-badge {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  background-color: var(--color-bg);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-light);
  line-height: 1.3;
}

.category-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.35rem;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.category-card-desc {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  flex: 1;
}

.card-footer {
  margin-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-primary);
}

.card-footer .arrow {
  display: inline-block;
  transition: transform var(--duration) var(--ease);
}

.category-card:hover .card-footer .arrow,
.product-card:hover .card-footer .arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   09. PRODUCTS GRID & PRODUCT CARDS
   ========================================================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.product-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  text-align: left;
  user-select: none;
  transition: all var(--duration) var(--ease);
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1 !important;
}

@media (prefers-color-scheme: dark) {
  .product-card:hover {
    border-color: #3f3f46 !important;
  }
}

.product-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.35rem;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.product-card-desc {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  flex: 1;
}

/* ==========================================================================
   10. BACK NAVIGATION BUTTON
   ========================================================================== */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  background-color: transparent;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--duration) var(--ease),
              color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

.back-btn:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border-light);
}

.back-btn svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* ==========================================================================
   11. CHECKLIST CONTAINER & PRODUCT HEADER
   ========================================================================== */
.checklist-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem var(--container-padding) 4rem;
  width: 100%;
}

.checklist-list {
  display: flex;
  flex-direction: column;
}

.product-header {
  margin-bottom: 1.5rem;
}

.product-header-top {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.product-header-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-primary-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
  font-size: 1.5rem;
  line-height: 1;
}

.product-header-icon svg {
  width: 26px;
  height: 26px;
  stroke: var(--color-primary);
  stroke-width: 1.75;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.product-header-info {
  display: flex;
  flex-direction: column;
}

.product-category-tag {
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: 0.15rem;
}

.product-header-info h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  line-height: 1.25;
  margin: 0;
}

.product-header-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   12. GENERAL INSPECTION TIPS ACCORDION
   ========================================================================== */
.general-tips {
  margin-top: 1rem;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
}

.tips-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background-color: var(--color-bg);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  border: none;
  text-align: left;
  transition: background-color var(--duration) var(--ease),
              color var(--duration) var(--ease);
}

.tips-toggle:hover {
  background-color: var(--color-border-light);
  color: var(--color-text);
}

.tips-toggle .chevron {
  transition: transform var(--duration-slow) var(--ease);
  font-size: 0.7rem;
  display: inline-block;
}

.tips-toggle.expanded .chevron {
  transform: rotate(180deg);
}

.tips-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease),
              opacity var(--duration-slow) var(--ease);
  opacity: 0;
}

.tips-content.expanded {
  max-height: 500px;
  opacity: 1;
}

.tips-list {
  padding: 0.75rem 1rem 0.75rem 2.25rem;
  margin: 0;
  list-style: none;
}

.tips-list li {
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  position: relative;
}

.tips-list li:last-child {
  margin-bottom: 0;
}

.tips-list li::before {
  content: '•';
  position: absolute;
  left: -1.25rem;
  color: var(--color-primary);
  font-size: 1.1rem;
  line-height: 1.4;
}

/* ==========================================================================
   13. STICKY PROGRESS BAR TRACKER
   ========================================================================== */
.progress-container {
  position: sticky;
  top: var(--header-height);
  z-index: 50;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  padding: 1rem 0;
  margin-bottom: 1.5rem;
  transition: background-color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.progress-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.progress-text {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.progress-track {
  height: 6px;
  background-color: var(--color-border-light);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease);
  min-width: 0;
  width: 0%;
}

/* ==========================================================================
   14. CHECKLIST ITEM ROW & CARD
   ========================================================================== */
.checklist-item {
  display: flex;
  gap: 0.875rem;
  padding: 1rem;
  margin-bottom: 0.5rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all var(--duration) var(--ease);
  align-items: flex-start;
  position: relative;
}

.checklist-item:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-xs);
}

.checklist-item.checked {
  background-color: var(--color-primary-bg);
  border-color: rgba(22, 163, 74, 0.2);
}

.checklist-item.checked .item-title {
  color: var(--color-text-secondary);
  text-decoration: line-through;
  text-decoration-color: var(--color-text-tertiary);
}

/* ==========================================================================
   15. CUSTOM SVG CHECKBOX COMPONENT
   ========================================================================== */
.checklist-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  min-width: 22px;
  margin-top: 2px;
  border: 2px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  position: relative;
  display: grid;
  place-content: center;
  background-color: var(--color-surface);
  flex-shrink: 0;
}

.checklist-checkbox::before {
  content: '';
  width: 12px;
  height: 12px;
  background-color: transparent;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  transform: scale(0);
  transition: transform 150ms var(--ease),
              background-color 150ms var(--ease);
}

.checklist-checkbox::after {
  content: none !important;
}

.checklist-checkbox:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.checklist-checkbox:checked::before {
  background-color: #ffffff;
  transform: scale(1);
}

.checklist-checkbox:not(:checked)::before {
  transform: scale(0);
}

.checklist-checkbox:hover:not(:checked) {
  border-color: var(--color-primary-dark);
}

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

/* ==========================================================================
   16. CHECKLIST ITEM CONTENT & PRIORITY BADGES
   ========================================================================== */
.item-content {
  flex: 1;
  min-width: 0;
}

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.25rem;
  flex-wrap: wrap;
}

.item-title {
  font-size: 0.9rem;
  font-weight: 550;
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.4;
  transition: color var(--duration) var(--ease);
}

.item-description {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* Priority Badges */
.priority-badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  line-height: 1.2;
}

.priority-high {
  color: var(--color-high);
  background-color: var(--color-high-bg);
  border: 1px solid rgba(220, 38, 38, 0.15);
}

.priority-medium {
  color: var(--color-medium);
  background-color: var(--color-medium-bg);
  border: 1px solid rgba(217, 119, 6, 0.15);
}

.priority-low {
  color: var(--color-low);
  background-color: var(--color-low-bg);
  border: 1px solid rgba(37, 99, 235, 0.15);
}

/* ==========================================================================
   17. PRO TIP COLLAPSIBLE ACCORDION
   ========================================================================== */
.pro-tip-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  padding: 0.25rem 0;
  border: none;
  transition: color var(--duration) var(--ease);
}

.pro-tip-toggle:hover {
  text-decoration: underline;
  color: var(--color-primary-dark);
}

.pro-tip {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  padding: 0 0.75rem;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  font-style: italic;
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-sm);
  transition: max-height var(--duration-slow) var(--ease),
              opacity var(--duration-slow) var(--ease),
              margin-top var(--duration-slow) var(--ease),
              padding var(--duration-slow) var(--ease);
}

.pro-tip.expanded {
  max-height: 200px;
  opacity: 1;
  margin-top: 0.5rem;
  padding: 0.75rem;
  background-color: var(--color-primary-bg);
}

/* ==========================================================================
   18. ACTIONS BAR TOOLBAR
   ========================================================================== */
.actions-bar {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-light);
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
}

/* ==========================================================================
   19. BUTTON SYSTEM (.btn, .btn-primary, .btn-secondary)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 550;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  border: 1px solid transparent;
  user-select: none;
  text-decoration: none;
  font-family: inherit;
  line-height: 1.4;
  white-space: nowrap;
}

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

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

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
}

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

.btn-secondary:hover {
  background-color: var(--color-surface);
  border-color: var(--color-text-tertiary);
  color: var(--color-text);
  box-shadow: var(--shadow-xs);
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  aspect-ratio: 1 / 1;
}

/* ==========================================================================
   20. COMPLETION CELEBRATION MODAL
   ========================================================================== */
.celebration {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn var(--duration-slow) var(--ease);
}

.celebration-content {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  animation: popIn 0.35s var(--ease);
}

.celebration-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: inline-block;
  line-height: 1;
}

.celebration-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.celebration-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.celebration-subtitle strong {
  color: var(--color-text);
  font-weight: 600;
}

.celebration-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ==========================================================================
   21. CONFETTI PARTICLE SYSTEM
   ========================================================================== */
#confetti-container {
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  z-index: 1001;
  pointer-events: none;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  from {
    top: -10px;
    opacity: 1;
    transform: rotateZ(0deg);
  }
  to {
    top: 100vh;
    opacity: 0;
    transform: rotateZ(720deg);
  }
}

/* ==========================================================================
   22. TOAST NOTIFICATIONS (.toast)
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  opacity: 0;
  background-color: var(--color-text);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 2000;
  pointer-events: none;
  box-shadow: var(--shadow-lg);
  transition: transform var(--duration-slow) var(--ease),
              opacity var(--duration-slow) var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

@media (prefers-color-scheme: dark) {
  .toast {
    background-color: #27272a;
    color: var(--color-text);
    border: 1px solid var(--color-border);
  }
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================================================
   23. EMPTY STATE SCREENS (.empty-state)
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-state-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.4;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
}

.empty-state-icon svg {
  width: 48px;
  height: 48px;
  stroke: var(--color-text-tertiary);
  fill: none;
  stroke-width: 1.5;
}

.empty-state-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.empty-state-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  max-width: 420px;
  margin: 0 auto;
  line-height: 1.55;
}

/* ==========================================================================
   24. APP FOOTER
   ========================================================================== */
.app-footer {
  padding: 2rem var(--container-padding);
  border-top: 1px solid var(--color-border-light);
  text-align: center;
  background-color: var(--color-surface);
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-tagline {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
  font-weight: 500;
}

.footer-copyright {
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
}

/* ==========================================================================
   25. VIEW TRANSITIONS & KEYFRAME ANIMATIONS
   ========================================================================== */
.view-enter {
  opacity: 0;
  transform: translateY(12px);
}

.view-enter-active {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--duration-slow) var(--ease),
              transform var(--duration-slow) var(--ease);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes popIn {
  0% { opacity: 0; transform: scale(0.92); }
  100% { opacity: 1; transform: scale(1); }
}

/* ==========================================================================
   26. ACCESSIBILITY, FOCUS STATES & REDUCED MOTION
   ========================================================================== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.category-card:focus-visible,
.product-card:focus-visible,
.search-result-item:focus-visible,
.btn:focus-visible,
.tips-toggle:focus-visible,
.pro-tip-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   27. RESPONSIVE DESIGN: LARGE TABLET / SMALL LAPTOP (<= 1024px)
   ========================================================================== */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.25rem;
  }

  .categories-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }

  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }

  .search-input {
    width: 220px;
  }

  .hero {
    padding: 3.5rem 1.25rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }
}

/* ==========================================================================
   28. RESPONSIVE DESIGN: TABLET / iPAD (<= 768px)
   ========================================================================== */
@media (max-width: 768px) {
  :root {
    --header-height: auto;
    --container-padding: 1rem;
  }

  /* -- Header -- */
  .app-header {
    height: auto;
    padding: 0.75rem 0;
  }

  .header-container {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0 1rem;
  }

  .header-brand-nav {
    justify-content: space-between;
    width: 100%;
  }

  .breadcrumb {
    display: none;
  }

  .search-container {
    width: 100%;
    max-width: 100%;
  }

  .search-input {
    width: 100%;
  }

  .search-input:focus {
    width: 100%;
  }

  .search-results {
    width: 100%;
    left: 0;
    right: 0;
    max-height: 60vh;
  }

  /* -- Hero -- */
  .hero {
    padding: 3rem 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .hero-badge {
    font-size: 0.72rem;
  }

  /* -- Content -- */
  .container {
    padding: 1.75rem 1rem;
  }

  .section-header {
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
  }

  .categories-grid,
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 0.75rem;
  }

  /* -- Checklist -- */
  .checklist-container {
    padding: 1.5rem 1rem 3rem;
  }

  .progress-container {
    top: 0;
  }

  .product-header-top {
    flex-direction: row;
    align-items: center;
  }

  .product-header-icon {
    width: 44px;
    height: 44px;
  }

  /* -- Action Buttons -- */
  .actions-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .actions-bar .btn {
    width: 100%;
    justify-content: center;
    min-height: 48px;
  }

  /* -- Touch-friendly targets -- */
  .category-card,
  .product-card {
    padding: 1.25rem;
  }

  .checklist-item {
    padding: 1rem;
    gap: 0.75rem;
  }

  .checklist-checkbox {
    width: 24px;
    height: 24px;
    min-width: 24px;
  }

  .back-btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  /* -- Celebration -- */
  .celebration-content {
    width: 92%;
    max-width: 380px;
    padding: 2rem 1.5rem;
  }
}

/* ==========================================================================
   29. RESPONSIVE DESIGN: LARGE PHONE (<= 480px)
   ========================================================================== */
@media (max-width: 480px) {
  /* -- Hero -- */
  .hero {
    padding: 2.5rem 1rem;
  }

  .hero h1 {
    font-size: 1.5rem;
    letter-spacing: -0.02em;
  }

  .hero p {
    font-size: 0.88rem;
  }

  .hero-badge {
    font-size: 0.7rem;
    padding: 0.3rem 0.7rem;
  }

  /* -- Layout -- */
  .container {
    padding: 1.25rem 0.875rem;
  }

  .section-title {
    font-size: 1.2rem;
  }

  .section-subtitle {
    font-size: 0.82rem;
  }

  /* -- Cards go full single column -- */
  .categories-grid,
  .products-grid {
    grid-template-columns: 1fr;
    gap: 0.625rem;
  }

  .category-card,
  .product-card {
    padding: 1rem;
  }

  .card-icon {
    width: 36px;
    height: 36px;
  }

  .card-icon svg {
    width: 20px;
    height: 20px;
  }

  .category-card-title,
  .product-card-title {
    font-size: 0.95rem;
  }

  .category-card-desc,
  .product-card-desc {
    font-size: 0.8rem;
  }

  /* -- Checklist -- */
  .checklist-container {
    padding: 1rem 0.875rem 3rem;
  }

  .checklist-item {
    padding: 0.85rem;
    gap: 0.625rem;
  }

  .item-title {
    font-size: 0.85rem;
  }

  .item-description {
    font-size: 0.78rem;
  }

  .priority-badge {
    font-size: 0.6rem;
    padding: 0.1rem 0.4rem;
  }

  .pro-tip-toggle {
    font-size: 0.74rem;
  }

  .pro-tip.expanded {
    font-size: 0.78rem;
    padding: 0.6rem;
  }

  /* -- Progress -- */
  .progress-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .progress-title,
  .progress-text {
    font-size: 0.72rem;
  }

  /* -- Product Header -- */
  .product-header-icon {
    width: 40px;
    height: 40px;
  }

  .product-header-icon svg {
    width: 22px;
    height: 22px;
  }

  .product-header-info h1 {
    font-size: 1.25rem;
  }

  .product-category-tag {
    font-size: 0.65rem;
  }

  /* -- Celebration -- */
  .celebration-content {
    padding: 1.75rem 1.25rem;
    width: 94%;
  }

  .celebration-icon {
    font-size: 2.5rem;
  }

  .celebration-title {
    font-size: 1.25rem;
  }

  .celebration-subtitle {
    font-size: 0.82rem;
  }

  .celebration-actions {
    flex-direction: column;
  }

  .celebration-actions .btn {
    width: 100%;
  }

  /* -- Footer -- */
  .app-footer {
    padding: 1.5rem 0.875rem;
  }

  .footer-tagline {
    font-size: 0.78rem;
  }

  .footer-copyright {
    font-size: 0.68rem;
  }
}

/* ==========================================================================
   30. RESPONSIVE DESIGN: SMALL PHONE (<= 360px)
   ========================================================================== */
@media (max-width: 360px) {
  .hero h1 {
    font-size: 1.35rem;
  }

  .hero p {
    font-size: 0.82rem;
  }

  .logo-text {
    font-size: 1rem;
  }

  .category-card,
  .product-card {
    padding: 0.875rem;
  }

  .card-icon {
    width: 32px;
    height: 32px;
  }

  .card-icon svg {
    width: 18px;
    height: 18px;
  }

  .checklist-item {
    padding: 0.75rem;
    gap: 0.5rem;
  }

  .checklist-checkbox {
    width: 20px;
    height: 20px;
    min-width: 20px;
  }

  .actions-bar .btn {
    font-size: 0.8rem;
    padding: 0.55rem 1rem;
  }

  .product-header-top {
    gap: 0.625rem;
  }

  .product-header-info h1 {
    font-size: 1.1rem;
  }

  .search-input {
    font-size: 0.8rem;
    height: 36px;
    padding-left: 32px;
  }
}

/* ==========================================================================
   31. LANDSCAPE ORIENTATION ADJUSTMENTS
   ========================================================================== */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: 1.5rem 1rem;
  }

  .hero h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
  }

  .hero p {
    font-size: 0.85rem;
  }

  .hero-badge {
    margin-bottom: 0.75rem;
  }

  .progress-container {
    padding: 0.5rem 0;
  }

  .celebration-content {
    padding: 1.5rem;
    max-height: 90vh;
    overflow-y: auto;
  }
}

/* ==========================================================================
   32. iPAD SPECIFIC (Landscape) — 2 column grid locked
   ========================================================================== */
@media (min-width: 769px) and (max-width: 1024px) {
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   33. SAFE AREA INSETS (Notch devices like iPhone X+)
   ========================================================================== */
@supports (padding: env(safe-area-inset-bottom)) {
  .app-header {
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }

  .app-footer {
    padding-bottom: calc(1.5rem + env(safe-area-inset-bottom));
  }

  .actions-bar {
    padding-bottom: env(safe-area-inset-bottom);
  }

  .toast {
    bottom: calc(2rem + env(safe-area-inset-bottom));
  }

  .celebration {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* ==========================================================================
   34. TOUCH DEVICE ENHANCEMENTS
   ========================================================================== */
@media (hover: none) and (pointer: coarse) {
  /* Larger touch targets */
  .category-card,
  .product-card {
    min-height: 80px;
  }

  .checklist-checkbox {
    width: 26px;
    height: 26px;
    min-width: 26px;
  }

  .back-btn {
    min-height: 44px;
    padding: 0.5rem 0.875rem;
  }

  .btn {
    min-height: 48px;
    padding: 0.7rem 1.25rem;
  }

  .search-result-item {
    min-height: 52px;
    padding: 0.875rem 1rem;
  }

  .tips-toggle {
    min-height: 48px;
  }

  .pro-tip-toggle {
    min-height: 44px;
    padding: 0.4rem 0;
  }

  /* Disable hover effects on touch — rely on active state */
  .category-card:hover,
  .product-card:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
  }

  .category-card:active,
  .product-card:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-xs);
  }
}

/* ==========================================================================
   29. PRINT MEDIA STYLESHEET
   ========================================================================== */
@media print {
  .app-header,
  .app-footer,
  .actions-bar,
  .back-btn,
  .search-container,
  #confetti-container,
  .toast,
  .tips-toggle,
  .pro-tip-toggle {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 12pt;
  }

  .checklist-container {
    max-width: 100% !important;
    padding: 0 !important;
  }

  .checklist-item {
    box-shadow: none !important;
    border: 1px solid #d1d5db !important;
    break-inside: avoid;
    page-break-inside: avoid;
    margin-bottom: 0.5rem !important;
    background: #ffffff !important;
  }

  .checklist-checkbox {
    border: 2px solid #000000 !important;
  }

  .pro-tip.expanded {
    display: block !important;
    max-height: none !important;
    opacity: 1 !important;
    border-left: 2px solid #000000 !important;
    background: #f9fafb !important;
  }

  .progress-container {
    position: static !important;
    box-shadow: none !important;
    border: 1px solid #d1d5db !important;
  }
}