/**
 * Estilos Canónicos - Calculadora de Acuariofilia y Aquascaping
 * Tipografías: Outfit (headings), Inter (body), JetBrains Mono (cifras/fórmulas)
 * Paleta: Midnight Slate con acentos azul cian, esmeralda y verde lima
 * Soporte tema claro / oscuro con variables semánticas de alto contraste (Lección 282)
 */

:root {
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Paleta base tema claro */
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-sub: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-focus: #0284c7;

  /* Acentos temáticos acuáticos */
  --aqua-primary: #0284c7;
  --aqua-primary-hover: #0369a1;
  --aqua-gradient: linear-gradient(135deg, #0284c7 0%, #0d9488 100%);
  --aqua-glow: rgba(2, 132, 199, 0.15);

  /* Semáforo biológico CO2 (Claro) */
  --co2-opt-bg: #dcfce7;
  --co2-opt-text: #14532d;
  --co2-opt-border: rgba(34, 197, 94, 0.4);

  --co2-low-bg: #e0f2fe;
  --co2-low-text: #0369a1;
  --co2-low-border: rgba(56, 189, 248, 0.4);

  --co2-warn-bg: #fef3c7;
  --co2-warn-text: #92400e;
  --co2-warn-border: rgba(245, 158, 11, 0.4);

  --co2-danger-bg: #fee2e2;
  --co2-danger-text: #991b1b;
  --co2-danger-border: rgba(239, 68, 68, 0.4);
}

[data-theme="dark"] {
  --bg-page: #0b0f17;
  --bg-card: #131b26;
  --bg-card-sub: #1a2434;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border-color: #243044;
  --border-focus: #38bdf8;

  --aqua-primary: #38bdf8;
  --aqua-primary-hover: #7dd3fc;
  --aqua-gradient: linear-gradient(135deg, #0284c7 0%, #14b8a6 100%);
  --aqua-glow: rgba(56, 189, 248, 0.15);

  /* Semáforo biológico CO2 (Oscuro) */
  --co2-opt-bg: rgba(34, 197, 94, 0.16);
  --co2-opt-text: #86efac;
  --co2-opt-border: rgba(34, 197, 94, 0.35);

  --co2-low-bg: rgba(56, 189, 248, 0.16);
  --co2-low-text: #7dd3fc;
  --co2-low-border: rgba(56, 189, 248, 0.35);

  --co2-warn-bg: rgba(245, 158, 11, 0.16);
  --co2-warn-text: #fde68a;
  --co2-warn-border: rgba(245, 158, 11, 0.35);

  --co2-danger-bg: rgba(239, 68, 68, 0.16);
  --co2-danger-text: #fca5a5;
  --co2-danger-border: rgba(239, 68, 68, 0.35);
}

/* Reset y base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6,
.brand-title,
.section-title,
.tab-btn,
.panel-title {
  font-family: var(--font-heading);
}

.mono, code, .number-val, .metric-value {
  font-family: var(--font-mono);
}

/* Layout principal */
.tool-layout {
  max-width: 1200px;
  margin: 1.5rem auto 3rem;
  padding: 0 1rem;
  width: 100%;
}

.tool-with-sidebar {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  width: 100%;
}

.tool-main-content {
  flex: 1 1 0%;
  min-width: 0;
  width: 100%;
}

/* Tarjeta principal */
.card-main {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
}

@media (min-width: 768px) {
  .card-main {
    padding: 2rem;
  }
}

/* Presets rápidos de acuario */
.presets-bar {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.presets-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.presets-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn-preset {
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
  min-height: 40px;
}

.btn-preset:hover {
  border-color: var(--aqua-primary);
  background: var(--aqua-glow);
  color: var(--aqua-primary);
}

.btn-preset.is-active {
  background: var(--aqua-primary);
  color: #ffffff;
  border-color: var(--aqua-primary);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
}

/* Navegación por pestañas */
.tabs-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .tabs-nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.tab-btn {
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.75rem 0.5rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  text-align: center;
  min-height: 64px;
  transition: all 0.2s ease;
}

.tab-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

.tab-btn:hover {
  color: var(--text-main);
  border-color: var(--border-focus);
}

.tab-btn.is-active {
  background: var(--bg-card);
  color: var(--aqua-primary);
  border-color: var(--aqua-primary);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.12);
}

/* Paneles de pestañas */
.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-header {
  margin-bottom: 1.25rem;
}

.panel-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text-main);
}

.panel-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Grids de formularios */
.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .form-grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.form-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

@media (min-width: 640px) {
  .form-grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.form-grid-4 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

@media (min-width: 768px) {
  .form-grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Grupos de campos */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-hint {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* Inputs y Selects canónicos */
.input-wrapper {
  display: flex;
  align-items: center;
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  min-height: 40px;
}

.input-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--aqua-glow);
}

.form-input {
  flex: 1 1 0%;
  width: 0;
  min-width: 0;
  background: transparent;
  border: none;
  padding: 0 0.75rem;
  font-size: 0.95rem;
  color: var(--text-main);
  height: 40px;
  font-family: var(--font-mono);
}

.form-input:focus {
  outline: none;
}

.input-suffix {
  padding: 0 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
  user-select: none;
}

.form-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  height: 40px;
  padding: 0 2.5rem 0 0.75rem;
  background-color: var(--bg-card-sub);
  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;
  background-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  font-size: 0.9rem;
  font-family: var(--font-main);
  appearance: none;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--aqua-glow);
}

.form-select option {
  background-color: var(--bg-card);
  color: var(--text-main);
}

/* Slider de rango */
.range-slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
  cursor: pointer;
  accent-color: var(--aqua-primary);
  margin: 0.4rem 0;
}

/* Tarjeta métrica de resultado destacada */
.result-card-highlight {
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 640px) {
  .result-card-highlight {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.result-main-col {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.result-tag {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.result-value-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.result-number-huge {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1;
}

.result-unit {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.badge-state {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid transparent;
  width: fit-content;
}

.badge-state.state-optimal {
  background: var(--co2-opt-bg);
  color: var(--co2-opt-text);
  border-color: var(--co2-opt-border);
}

.badge-state.state-low {
  background: var(--co2-low-bg);
  color: var(--co2-low-text);
  border-color: var(--co2-low-border);
}

.badge-state.state-warning {
  background: var(--co2-warn-bg);
  color: var(--co2-warn-text);
  border-color: var(--co2-warn-border);
}

.badge-state.state-danger {
  background: var(--co2-danger-bg);
  color: var(--co2-danger-text);
  border-color: var(--co2-danger-border);
}

/* Simulador de Drop Checker */
.dropchecker-container {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.dropchecker-flask {
  width: 60px;
  height: 60px;
  flex-shrink: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dropchecker-bulb {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.6);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: background-color 0.3s ease;
}

.dropchecker-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.dropchecker-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.dropchecker-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Alertas informativas canónicas */
.info-box-alert {
  display: flex;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
  border-radius: 10px;
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  background: var(--bg-card-sub);
  border-left: 4px solid var(--aqua-primary);
  color: var(--text-main);
}

.info-box-alert svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  stroke: var(--aqua-primary);
  margin-top: 0.1rem;
}

/* Matriz pH vs kH */
.matrix-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: 1.5rem;
  background: var(--bg-card);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: center;
  font-family: var(--font-mono);
}

.matrix-table th,
.matrix-table td {
  padding: 0.5rem 0.4rem;
  border: 1px solid var(--border-color);
  white-space: nowrap;
}

.matrix-table th {
  background: var(--bg-card-sub);
  font-weight: 700;
  color: var(--text-main);
}

.matrix-table .th-corner {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.matrix-table .co2-cell-low {
  background: var(--co2-low-bg);
  color: var(--co2-low-text);
}

.matrix-table .co2-cell-opt {
  background: var(--co2-opt-bg);
  color: var(--co2-opt-text);
  font-weight: 700;
}

.matrix-table .co2-cell-warn {
  background: var(--co2-warn-bg);
  color: var(--co2-warn-text);
}

.matrix-table .co2-cell-danger {
  background: var(--co2-danger-bg);
  color: var(--co2-danger-text);
  font-weight: 700;
}

.matrix-table .is-active-cell {
  outline: 3px solid var(--aqua-primary);
  outline-offset: -2px;
  position: relative;
  z-index: 2;
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.6);
  transform: scale(1.05);
}

.matrix-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

/* Esquema visual de la pecera en corte */
.aquarium-visual-cut {
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.tank-svg-container {
  width: 100%;
  max-width: 480px;
  margin: 0 auto 1rem;
}

.tank-svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Métricas secundarias en cuadrícula */
.stats-grid-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .stats-grid-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.stat-metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.stat-metric-title {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.stat-metric-number {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.stat-metric-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Tabla de sales NPK */
.table-responsive-custom {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: 1.5rem;
}

.dosing-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.dosing-table th,
.dosing-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.dosing-table th {
  background: var(--bg-card-sub);
  font-weight: 700;
  color: var(--text-main);
}

.dosing-table tr:last-child td {
  border-bottom: none;
}

.dosing-table .col-mono {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--aqua-primary);
}

/* Botones de acción principales */
.btn-action-primary {
  width: 100%;
  min-height: 44px;
  background: var(--aqua-gradient);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-action-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.35);
}

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

.btn-action-secondary {
  width: 100%;
  min-height: 44px;
  background: var(--bg-card-sub);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.btn-action-secondary:hover {
  border-color: var(--border-focus);
  color: var(--aqua-primary);
}

/* Sección SEO Canónica */
.seo-guide-section {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.seo-guide-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.seo-guide-subtitle {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.5rem 0 0.6rem;
  color: var(--text-main);
}

.seo-guide-text {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.seo-table th,
.seo-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.seo-table th {
  background: var(--bg-card-sub);
  font-weight: 700;
  color: var(--text-main);
}

/* Modales canónicos accesibles */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 23, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.3);
  transform: scale(0.95);
  transition: transform 0.2s ease;
}

.modal-backdrop.is-open .modal-dialog {
  transform: scale(1);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.btn-modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-modal-close:hover {
  background: var(--bg-card-sub);
  color: var(--text-main);
}

.modal-body {
  padding: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.6;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Impresión */
@media print {
  .app-header,
  .tools-ad-banner-section,
  .tool-ad-sidebar,
  .fijate-footer,
  .presets-bar,
  .tabs-nav,
  .btn-action-primary,
  .btn-action-secondary {
    display: none !important;
  }

  .card-main {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }

  .tab-panel {
    display: block !important;
    page-break-after: always;
  }
}