/* ============================================
   MEJOR TASA - CSS
   ============================================ */

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #dbeafe;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.2s ease;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border-color: #334155;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-light: #1e3a5f;
  --success: #34d399;
  --success-bg: #064e3b;
  --success-border: #059669;
  --danger: #f87171;
  --danger-bg: #450a0a;
  --danger-border: #991b1b;
  --warning: #fbbf24;
  --warning-bg: #451a03;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   LAYOUT
   ============================================ */

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.app-header {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.brand-icon {
  font-size: 2rem;
  line-height: 1;
}

.brand h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.125rem;
}

.main-content {
  padding-bottom: 3rem;
}

.app-footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.app-footer a {
  color: var(--accent);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* ============================================
   THEME TOGGLE
   ============================================ */

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.25rem;
  transition: var(--transition);
}

.theme-toggle:hover {
  transform: scale(1.05);
  border-color: var(--accent);
}

/* ============================================
   TOOLBAR
   ============================================ */

.toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-icon {
  font-size: 1rem;
}

.loading-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.last-update {
  margin-left: auto;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ============================================
   ERROR BANNER
   ============================================ */

.error-banner {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.error-banner::before {
  content: "⚠️";
}

/* ============================================
   GRID & PANELS
   ============================================ */

.grid-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .grid-layout {
    grid-template-columns: 1fr 1fr;
  }
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.panel:hover {
  box-shadow: var(--shadow);
}

.panel-header {
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */

.form-group {
  margin-bottom: 1.25rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.375rem;
}

.field {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  outline: none;
}

.field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.field::placeholder {
  color: var(--text-muted);
}

select.field {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

.field-hint {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.375rem;
  line-height: 1.4;
}

.info-text {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.divider {
  height: 1px;
  background: var(--border-color);
  margin: 1.25rem 0;
}

/* ============================================
   META INFO
   ============================================ */

.meta-info {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-color);
}

.meta-line {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

/* ============================================
   EMPTY STATE
   ============================================ */

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
  opacity: 0.7;
}

.empty-state p {
  font-size: 0.9375rem;
}

/* ============================================
   METRICS GRID
   ============================================ */

.metrics-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
  .metrics-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.metric-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: var(--transition);
}

.metric-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.metric-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
}

.metric-value {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

.metric-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   RECOMMENDATION BOX
   ============================================ */

.recommendation-box {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.recommendation-box.positive {
  background: var(--success-bg);
  border-color: var(--success-border);
}

.recommendation-box.negative {
  background: var(--danger-bg);
  border-color: var(--danger-border);
}

.recommendation-box.neutral {
  background: var(--bg-tertiary);
}

.rec-icon {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.rec-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.rec-content p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* ============================================
   BREAKDOWN
   ============================================ */

.breakdown {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
}

.breakdown h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  font-size: 0.9375rem;
  border-bottom: 1px dashed var(--border-color);
}

.breakdown-row:last-child {
  border-bottom: none;
}

.breakdown-row span:first-child {
  color: var(--text-secondary);
}

.breakdown-row span:last-child {
  font-weight: 500;
  color: var(--text-primary);
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 0.875rem;
}

.breakdown-row.total {
  margin-top: 0.5rem;
  padding-top: 0.75rem;
  border-top: 2px solid var(--border-color);
  border-bottom: none;
  font-weight: 600;
}

.breakdown-row.total span:first-child {
  color: var(--text-primary);
  font-weight: 600;
}

.breakdown-row.total span:last-child {
  font-weight: 700;
  font-size: 1rem;
}

/* ============================================
   UTILITIES
   ============================================ */

.hidden {
  display: none !important;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 640px) {
  .brand h1 {
    font-size: 1.25rem;
  }

  .brand p {
    font-size: 0.8125rem;
  }

  .panel {
    padding: 1.25rem;
  }

  .metric-value {
    font-size: 1.125rem;
  }

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

  .last-update {
    margin-left: 0;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.results-content {
  animation: fadeIn 0.3s ease;
}

.metric-card {
  animation: fadeIn 0.3s ease backwards;
}

.metric-card:nth-child(1) { animation-delay: 0.05s; }
.metric-card:nth-child(2) { animation-delay: 0.1s; }
.metric-card:nth-child(3) { animation-delay: 0.15s; }
.metric-card:nth-child(4) { animation-delay: 0.2s; }