/* ============================================
   UK Black Pride — Donation Allocation Widget
   Brand-matched design system
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,600;0,700;1,400&display=swap');

:root {
  /* Brand colours — extracted from ukblackpride.org.uk */
  --ukbp-purple: #94128B;
  --ukbp-gradient-purple: #A32FD9;
  --ukbp-maroon: #440B0E;
  --ukbp-hot-pink: #EE3E94;

  /* Functional palette */
  --card-border: rgba(148, 18, 139, 0.15);
  --card-border-hover: rgba(148, 18, 139, 0.35);
  --card-border-selected: rgba(148, 18, 139, 0.7);
  --card-bg: #FFFFFF;
  --card-bg-hover: rgba(148, 18, 139, 0.03);
  --card-bg-selected: rgba(148, 18, 139, 0.06);
  --card-glow: rgba(163, 47, 217, 0.12);

  --text-primary: #1A1A1A;
  --text-secondary: #555555;
  --text-tertiary: #555555;
  --surface: #FFFFFF;

  /* Typography */
  --font-heading: 'Poppins', 'Segoe UI', sans-serif;
  --font-body: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --space-xs: 0.375rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 2.5rem;
}

/* ---- Reset & Base ---- */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--surface);
  font-family: var(--font-body);
  color: var(--text-primary);
  line-height: 1.5;
  height: 100vh;
}

html {
  height: 100vh;
  overflow: hidden;
}

/* ---- Widget Container ---- */

.widget-container {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  height: 100vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---- Header ---- */

.widget-header {
  text-align: center;
  margin-bottom: var(--space-sm);
}

.widget-header h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.accent {
  color: var(--ukbp-purple);
}

.widget-header p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 480px;
  margin: 0 auto;
}

/* ---- Decorative divider ---- */

.header-divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--ukbp-gradient-purple), var(--ukbp-maroon));
  border-radius: 999px;
  margin: var(--space-sm) auto var(--space-md);
}

/* ---- Categories Grid ---- */

.categories-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

/* ---- Category Card ---- */

.category-card {
  position: relative;
  background: var(--card-bg);
  border: 1.5px solid var(--card-border);
  border-radius: 14px;
  padding: var(--space-md);
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    background-color 0.2s ease,
    box-shadow 0.2s ease,
    transform 0.15s ease;
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.category-card:hover {
  border-color: var(--card-border-hover);
  background: var(--card-bg-hover);
}

.category-card:active {
  transform: scale(0.985);
}

.category-card.selected {
  border-color: var(--card-border-selected);
  background: var(--card-bg-selected);
  box-shadow: 0 0 0 3px var(--card-glow);
}

/* Hidden native checkbox */
.category-card input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* ---- Custom Checkbox ---- */

.check-indicator {
  width: 22px;
  height: 22px;
  min-width: 22px;
  border-radius: 6px;
  border: 2px solid rgba(148, 18, 139, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    transform 0.15s ease;
  margin-top: 1px;
}

.category-card:hover .check-indicator {
  border-color: rgba(148, 18, 139, 0.45);
}

.category-card.selected .check-indicator {
  background: var(--ukbp-purple);
  border-color: var(--ukbp-purple);
  transform: scale(1.05);
}

.check-indicator svg {
  width: 13px;
  height: 13px;
  opacity: 0;
  transform: scale(0.5);
  transition:
    opacity 0.15s ease,
    transform 0.15s ease;
}

.category-card.selected .check-indicator svg {
  opacity: 1;
  transform: scale(1);
}

/* ---- Card Content ---- */

.card-content {
  flex: 1;
  min-width: 0;
}

.card-content .card-label {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 3px;
  transition: color 0.2s ease;
}

.category-card.selected .card-label {
  color: var(--ukbp-purple);
}

.card-content .card-description {
  font-weight: 400;
  font-size: 0.775rem;
  color: var(--text-secondary);
  line-height: 1.45;
  letter-spacing: 0.005em;
}

/* ---- Selection Counter ---- */

.selection-counter {
  text-align: center;
  margin-bottom: var(--space-md);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-tertiary);
  transition: color 0.2s ease;
  min-height: 1.4em;
}

.selection-counter.has-selection {
  color: var(--ukbp-purple);
  font-weight: 500;
}

/* ---- Actions ---- */

.widget-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: var(--space-md);
}

.submit-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 380px;
  padding: 1rem 2rem;
  background: linear-gradient(90deg, var(--ukbp-gradient-purple) 0%, var(--ukbp-maroon) 75%);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition:
    opacity 0.2s ease,
    transform 0.15s ease,
    box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.submit-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--ukbp-gradient-purple) 0%, var(--ukbp-hot-pink) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: inherit;
}

.submit-button:hover::before {
  opacity: 1;
}

.submit-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(163, 47, 217, 0.3);
}

.submit-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(163, 47, 217, 0.2);
}

.submit-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.submit-button:disabled::before {
  display: none;
}

.submit-button .btn-text {
  position: relative;
  z-index: 1;
}

.submit-button .btn-arrow {
  position: relative;
  z-index: 1;
  transition: transform 0.2s ease;
}

.submit-button:hover .btn-arrow {
  transform: translateX(3px);
}

/* Loading spinner inside button */
.submit-button .spinner {
  display: none;
  position: relative;
  z-index: 1;
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.submit-button.loading .btn-text,
.submit-button.loading .btn-arrow {
  display: none;
}

.submit-button.loading .spinner {
  display: block;
}

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

/* Skip link */
.skip-link {
  display: inline-block;
  margin-top: var(--space-md);
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-family: var(--font-body);
  font-size: 0.825rem;
  font-weight: 400;
  cursor: pointer;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition:
    color 0.2s ease,
    background-color 0.2s ease;
}

.skip-link:hover {
  color: var(--ukbp-purple);
  background: rgba(148, 18, 139, 0.05);
}

/* ---- Success State ---- */

.success-state {
  display: none;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  animation: fadeInUp 0.4s ease;
}

.success-state.visible {
  display: block;
}

.success-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--ukbp-gradient-purple), var(--ukbp-purple));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s both;
}

.success-icon svg {
  width: 32px;
  height: 32px;
}

.success-state h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.success-state p {
  font-weight: 300;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.3);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ---- Stage visibility ---- */

#allocation-form.hidden,
.intro-stage.hidden {
  display: none;
}

/* ---- Intro Stage ---- */

.intro-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeInUp 0.4s ease both;
}

.intro-content {
  text-align: center;
  max-width: 400px;
  margin: 0 auto;
  padding: var(--space-sm) 0;
}

.intro-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  animation: popIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s both;
}

.intro-icon svg {
  width: 100%;
  height: 100%;
}

.intro-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.65rem;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.intro-text {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.intro-begin-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 320px;
  padding: 1rem 2rem;
  background: linear-gradient(90deg, var(--ukbp-gradient-purple) 0%, var(--ukbp-maroon) 75%);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition:
    opacity 0.2s ease,
    transform 0.15s ease,
    box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.intro-begin-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--ukbp-gradient-purple) 0%, var(--ukbp-hot-pink) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: inherit;
}

.intro-begin-btn:hover::before {
  opacity: 1;
}

.intro-begin-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(163, 47, 217, 0.3);
}

.intro-begin-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(163, 47, 217, 0.2);
}

.intro-begin-btn .btn-text,
.intro-begin-btn .btn-arrow {
  position: relative;
  z-index: 1;
}

.intro-begin-btn:hover .btn-arrow {
  transform: translateX(3px);
}

.intro-begin-btn .btn-arrow {
  transition: transform 0.2s ease;
}

.intro-begin-btn:focus-visible {
  outline: 2px solid var(--ukbp-purple);
  outline-offset: 3px;
}

/* Stage 2 entrance animation */
#allocation-form:not(.hidden) {
  animation: fadeInUp 0.35s ease both;
}

/* ---- Card entrance stagger ---- */

.category-card {
  animation: cardEnter 0.35s ease both;
}

.category-card:nth-child(1)  { animation-delay: 0.02s; }
.category-card:nth-child(2)  { animation-delay: 0.05s; }
.category-card:nth-child(3)  { animation-delay: 0.08s; }
.category-card:nth-child(4)  { animation-delay: 0.11s; }
.category-card:nth-child(5)  { animation-delay: 0.14s; }
.category-card:nth-child(6)  { animation-delay: 0.17s; }
.category-card:nth-child(7)  { animation-delay: 0.20s; }
.category-card:nth-child(8)  { animation-delay: 0.23s; }
.category-card:nth-child(9)  { animation-delay: 0.26s; }
.category-card:nth-child(10) { animation-delay: 0.29s; }

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Header entrance */
.widget-header {
  animation: fadeInUp 0.4s ease both;
}

.header-divider {
  animation: fadeInUp 0.4s ease 0.05s both;
}

.widget-actions {
  animation: fadeInUp 0.35s ease 0.35s both;
}

/* ---- Focus styles (accessibility) ---- */

.category-card:focus-within {
  outline: 2px solid var(--ukbp-purple);
  outline-offset: 2px;
}

.submit-button:focus-visible,
.skip-link:focus-visible {
  outline: 2px solid var(--ukbp-purple);
  outline-offset: 3px;
}

/* ---- Responsive ---- */

@media (max-width: 520px) {
  .widget-container {
    padding: var(--space-lg) var(--space-md);
  }

  .categories-grid {
    grid-template-columns: 1fr;
    gap: 0.625rem;
  }

  .widget-header h1 {
    font-size: 1.45rem;
  }

  .widget-header p {
    font-size: 0.875rem;
  }

  .category-card {
    padding: var(--space-sm) var(--space-md);
  }

  .card-content .card-label {
    font-size: 0.825rem;
  }

  .card-content .card-description {
    font-size: 0.75rem;
  }

  .submit-button {
    font-size: 0.925rem;
    padding: 0.875rem 1.75rem;
  }
}

@media (max-width: 360px) {
  .widget-container {
    padding: var(--space-md) var(--space-sm);
  }

  .widget-header h1 {
    font-size: 1.3rem;
  }
}

/* ---- Reduced motion ---- */

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