/* ============================================================================
   FITCONVERTER - STYLES
   Design minimaliste, blanc/noir, responsive
   ============================================================================ */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  background: #FFFFFF;
  color: #141414;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid #E5E7EB;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.subtitle {
  color: #666;
  font-size: 1.125rem;
  font-weight: 400;
}

/* Main Content */
.main-content {
  flex: 1;
}

/* Card */
.card {
  background: #FAF8F6;
  border: 1px solid #141414;
  border-radius: 1.5rem;
  padding: 2rem;
  margin-bottom: 1.5rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #141414;
}

/* Buttons */
.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.btn {
  padding: 0.875rem 1.5rem;
  border-radius: 1rem;
  font-weight: 600;
  border: 1px solid #141414;
  background: #FFFFFF;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.95rem;
  font-family: inherit;
  color: #141414;
}

.btn:hover {
  background: #E8E6E4;
  transform: translateY(-1px);
}

.btn.active {
  background: #141414;
  color: #FFFFFF;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Category Buttons */
.cat-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.cat-btns .btn {
  flex: 0 0 auto;
  min-width: 120px;
}

/* Select */
select {
  width: 100%;
  padding: 0.875rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid #141414;
  background: #FFFFFF;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  font-family: inherit;
  color: #141414;
  transition: all 0.2s ease;
}

select:hover {
  background: #F9FAFB;
}

select:focus {
  outline: none;
  border-color: #3B82F6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Size Grid */
.size-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.size-btn {
  padding: 0.75rem;
  border-radius: 0.75rem;
  font-weight: 700;
  border: 1px solid #D9D9D9;
  background: #FFFFFF;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  font-family: inherit;
  font-size: 0.95rem;
}

.size-btn:hover {
  background: #E8E6E4;
  border-color: #141414;
  transform: translateY(-1px);
}

.size-btn.active {
  background: #141414;
  color: #FFFFFF;
  border-color: #141414;
}

/* Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.brand-box {
  background: #FFFFFF;
  border: 1px solid #D9D9D9;
  border-radius: 1rem;
  padding: 1.5rem;
}

/* Result Box */
.result-box {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border-radius: 0.75rem;
  background: #F3F4F6;
  border: 1px solid #E5E7EB;
}

.result-box h3 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
  color: #666;
}

.converted-size {
  font-size: 2rem;
  font-weight: 700;
  color: #141414;
  margin-bottom: 0.5rem;
}

.result-measurements {
  font-size: 0.875rem;
  color: #666;
  margin: 0.5rem 0;
}

.result-difference {
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  margin-top: 0.75rem;
  font-weight: 600;
}

.result-difference.good {
  background: #D1FAE5;
  color: #065F46;
}

.result-difference.warning {
  background: #FEF3C7;
  color: #92400E;
}

.result-difference.alert {
  background: #FEE2E2;
  color: #991B1B;
}

.result-note {
  font-size: 0.875rem;
  color: #666;
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: #F9FAFB;
  border-radius: 0.5rem;
  border-left: 3px solid #3B82F6;
}

/* Conversion List */
.conversion-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.conversion-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: #FFFFFF;
  border: 1px solid #E5E7EB;
  border-radius: 0.75rem;
  transition: all 0.2s ease;
}

.conversion-item:hover {
  border-color: #141414;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.brand-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: #141414;
}

.brand-note {
  font-size: 0.875rem;
  color: #666;
  margin-top: 0.125rem;
}

.conversion-size {
  font-size: 1.5rem;
  font-weight: 700;
  color: #141414;
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 3rem;
  padding: 2rem 1rem;
  border-top: 1px solid #E5E7EB;
}

.footer-links {
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

.footer-link {
  color: #141414;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: color 0.2s ease;
  padding: 0.25rem 0.5rem;
}

.footer-link:hover {
  color: #3B82F6;
  text-decoration: underline;
}

.footer-separator {
  color: #D1D5DB;
  font-weight: 300;
}

.footer-info {
  color: #666;
  font-size: 0.875rem;
  margin: 0.5rem 0;
}

.footer-copy {
  color: #999;
  font-size: 0.8rem;
  margin-top: 1.5rem;
}

/* Tab Navigation */
.tab-nav {
  display: flex;
  gap: 0;
  margin-bottom: 2rem;
  border-bottom: 2px solid #E5E7EB;
}

.tab-btn {
  padding: 0.75rem 1.5rem;
  border: none;
  background: none;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  color: #666;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s ease;
  font-family: inherit;
}

.tab-btn:hover {
  color: #141414;
}

.tab-btn.active {
  color: #141414;
  border-bottom-color: #141414;
}

.tab-description {
  color: #666;
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1.75rem;
  padding: 1rem 1.25rem;
  background: #F3F4F6;
  border-radius: 0.75rem;
  border-left: 3px solid #D1D5DB;
}

/* Universal Conversion Result */
.u-conversion-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.u-conversion-cell {
  text-align: center;
  padding: 1rem 0.75rem;
  background: #FFFFFF;
  border: 1px solid #E5E7EB;
  border-radius: 0.75rem;
}

.u-conversion-cell .system-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #999;
  margin-bottom: 0.25rem;
  font-weight: 600;
}

.u-conversion-cell .system-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #141414;
}

.u-measurements {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1rem 1.25rem;
  background: #F3F4F6;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  color: #666;
  font-weight: 500;
}

@media (max-width: 480px) {
  .u-conversion-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Utilities */
.hidden {
  display: none !important;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

/* Loading State */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Error/Warning Messages */
.message {
  padding: 1rem 1.25rem;
  border-radius: 0.75rem;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.message-info {
  background: #DBEAFE;
  color: #1E40AF;
  border: 1px solid #93C5FD;
}

.message-warning {
  background: #FEF3C7;
  color: #92400E;
  border: 1px solid #FDE68A;
}

.message-error {
  background: #FEE2E2;
  color: #991B1B;
  border: 1px solid #FECACA;
}

.message-success {
  background: #D1FAE5;
  color: #065F46;
  border: 1px solid #A7F3D0;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 1.5rem 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

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

  .size-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cat-btns .btn {
    min-width: 100px;
    font-size: 0.875rem;
  }

  .footer-links {
    flex-direction: column;
    gap: 0.75rem;
  }

  .footer-separator {
    display: none;
  }

  .converted-size {
    font-size: 1.5rem;
  }

  .conversion-size {
    font-size: 1.25rem;
  }
}

@media (max-width: 480px) {
  .size-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .card {
    padding: 1.5rem;
  }

  .brand-box {
    padding: 1rem;
  }
}

/* Print Styles */
@media print {
  .header, .footer {
    border: none;
  }

  .btn, select {
    border: 1px solid #000;
  }

  .conversion-item {
    break-inside: avoid;
  }
}