/**
 * Handle Height Calculator - International Version
 * Stylesheet
 *
 * Design:
 * - Modern, clean design
 * - Mobile-first approach
 * - WCAG AA compliant color contrast
 */

/* ============================================================
   CSS Variables (WCAG AA Compliant)
   ============================================================ */
:root {
  /* Colors */
  --color-primary: #2D5A27;
  --color-primary-light: #E8F5E9;
  --color-primary-dark: #1B3D16;

  --color-bg: #FAFAFA;
  --color-card: #FFFFFF;

  /* Text colors */
  --color-text: #1A1A1A;
  --color-text-muted: #4A4A4A;
  --color-text-light: #6B6B6B;

  --color-accent: #C65D00;
  --color-border: #D0D0D0;

  --color-error: #B71C1C;
  --color-error-bg: #FFEBEE;

  /* Focus states */
  --color-focus-ring: #2D5A27;
  --color-focus-bg: rgba(45, 90, 39, 0.08);

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 48px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   Layout
   ============================================================ */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 480px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ============================================================
   Header
   ============================================================ */
.header {
  text-align: center;
  padding: var(--space-xl) 0;
}

.title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  font-weight: 400;
}

/* ============================================================
   Unit Toggle
   ============================================================ */
.unit-toggle-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.unit-toggle-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.unit-toggle-buttons {
  display: flex;
  background: #F0F0F0;
  border-radius: 8px;
  padding: 4px;
  gap: 2px;
}

.unit-option {
  position: relative;
  cursor: pointer;
}

.unit-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.unit-option span {
  display: block;
  padding: 6px 16px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.unit-option input:checked + span {
  background: white;
  color: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.unit-option:hover span {
  color: var(--color-text);
}

/* ============================================================
   Form Section
   ============================================================ */
.form-section {
  width: 100%;
}

.form-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group:last-of-type {
  margin-bottom: var(--space-xl);
}

.form-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 4px;
}

.badge-required {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-optional {
  background-color: #F5F5F5;
  color: var(--color-text-muted);
}

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

.form-input {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  padding: var(--space-md) var(--space-lg);
  padding-right: 50px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-card);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder {
  color: #BDBDBD;
  opacity: 0.7;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input-unit {
  position: absolute;
  right: var(--space-lg);
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  pointer-events: none;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn-primary {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: white;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-xl);
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
}

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

.btn-primary:disabled {
  background-color: var(--color-text-light);
  cursor: not-allowed;
}

.btn-secondary {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-primary);
  background-color: transparent;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-lg);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
}

.btn-text {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
}

/* ============================================================
   Loading Section
   ============================================================ */
.loading-section {
  text-align: center;
  padding: var(--space-xxl) 0;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-md);
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

/* ============================================================
   Result Section
   ============================================================ */
.result-section {
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-card {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #C8E6C9 100%);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  margin-bottom: var(--space-lg);
}

.result-label {
  font-size: var(--font-size-base);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-md);
}

.result-value-wrapper {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.result-value {
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1;
}

.result-unit {
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--color-primary);
}

.result-range {
  font-size: var(--font-size-lg);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-md);
}

.result-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   Error Section
   ============================================================ */
.error-section {
  animation: fadeIn 0.3s ease;
}

.error-card {
  background-color: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
}

.error-icon {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.error-message {
  color: var(--color-error);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  text-align: center;
  padding: var(--space-xl) 0;
  margin-top: auto;
}

.footer-logo-link {
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.footer-logo {
  width: 48px;
  height: 48px;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer-logo-link:hover .footer-logo {
  opacity: 1;
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* ============================================================
   Accessibility
   ============================================================ */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.form-input:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-focus-bg);
  background-color: #FFFFFF;
}

.btn-primary:focus-visible {
  outline: 3px solid var(--color-primary-dark);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--color-focus-bg);
}

.btn-secondary:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  background-color: var(--color-primary-light);
}

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

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

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

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

/* ============================================================
   Product List Section
   ============================================================ */
.product-list-area {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.product-list-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.product-list {
  list-style: decimal;
  padding-left: 24px;
  margin: 0;
}

.product-list-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  margin-bottom: 0;
  line-height: 1.6;
}

.product-list-item .product-name-text {
  color: var(--color-text);
  font-weight: 600;
}

.product-list-item .handle-info {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-left: 4px;
}

.product-main-info {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px;
}

.product-list-loading {
  color: var(--color-text-muted);
  font-style: italic;
}

.product-list-empty {
  color: var(--color-text-muted);
}

/* ============================================================
   Affiliate Links (Multi-Country Amazon)
   ============================================================ */
.affiliate-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.affiliate-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 11px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.affiliate-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.affiliate-link:active {
  transform: translateY(0);
}

/* Amazon base style */
.affiliate-link.amazon {
  background-color: #FF9900;
  color: #000;
}

.affiliate-link.amazon:hover {
  background-color: #FFB84D;
}

/* Country-specific subtle indicators */
.affiliate-link.amazon.us::before { content: "🇺🇸"; font-size: 10px; }
.affiliate-link.amazon.uk::before { content: "🇬🇧"; font-size: 10px; }
.affiliate-link.amazon.de::before { content: "🇩🇪"; font-size: 10px; }
.affiliate-link.amazon.fr::before { content: "🇫🇷"; font-size: 10px; }
.affiliate-link.amazon.it::before { content: "🇮🇹"; font-size: 10px; }
.affiliate-link.amazon.es::before { content: "🇪🇸"; font-size: 10px; }

/* Mobile - 3 buttons per row */
@media (max-width: 480px) {
  .affiliate-links {
    gap: 4px;
  }

  .affiliate-link {
    padding: 4px 8px;
    font-size: 10px;
    flex: 0 0 calc(33.33% - 3px);
    justify-content: center;
  }

  .affiliate-link.amazon::before {
    font-size: 9px;
  }
}

/* Very small screens - 2 buttons per row */
@media (max-width: 360px) {
  .affiliate-link {
    flex: 0 0 calc(50% - 2px);
  }
}

/* ============================================================
   Responsive (Tablet+)
   ============================================================ */
@media (min-width: 768px) {
  .page-wrapper {
    max-width: 520px;
    padding: var(--space-xl);
  }

  .header {
    padding: var(--space-xxl) 0;
  }

  .title {
    font-size: 28px;
  }

  .form-card {
    padding: var(--space-xxl);
  }

  .result-value {
    font-size: 64px;
  }
}