/**
 * Fijate Tools - Calculadora de subredes IP y planificador VLSM
 * Estilos canónicos, visualizador binario de 32 bits y diseño responsive
 */

:root {
  --bg-primary: #0b0f19;
  --bg-surface: #111827;
  --bg-card: #1f2937;
  --bg-card-hover: #283548;
  --border-color: #374151;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-green: #10b981;
  --accent-yellow: #f59e0b;
  --accent-red: #ef4444;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.25);
  --transition-fast: 0.2s ease;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #f1f5f9;
  --bg-card-hover: #e2e8f0;
  --border-color: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.06);
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.mono-text {
  font-family: var(--font-mono);
}

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

.tool-with-sidebar {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.tool-main-content {
  flex: 1 1 0%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Tarjetas y bloques */
.card-main {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

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

.card-title {
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  line-height: 1.5;
}

/* Barra de pestañas principal */
.tab-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.tab-nav-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-nav-btn:hover {
  color: var(--accent-cyan);
}

.tab-nav-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Formulario IPv4 */
.form-grid-ipv4 {
  display: grid;
  grid-template-columns: 2fr 1.5fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  transition: var(--transition-fast);
  min-height: 44px;
}

.form-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.2);
}

.form-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  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='%2306b6d4' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 16px;
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: 44px;
}

.form-select:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.2);
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

.form-slider {
  flex: 1 1 0%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
  height: 6px;
}

/* Presets rápidos */
.presets-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.btn-preset-ip {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-preset-ip:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Visualizador de 32 bits */
.bits-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.bits-legend {
  display: flex;
  gap: 1.5rem;
  font-size: 0.82rem;
  margin-bottom: 0.85rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

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

.dot-net { background: var(--accent-blue); }
.dot-host { background: var(--accent-cyan); }

.bits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.bit-octet-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
}

.bit-octet-header {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  font-weight: 600;
}

.bit-chips-row {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
}

.bit-chip {
  background: var(--bg-card);
  border: 1px solid transparent;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.bit-chip:hover {
  transform: scale(1.15);
  z-index: 2;
}

.bit-network {
  background: rgba(59, 130, 246, 0.25);
  color: #60a5fa;
  border-color: rgba(59, 130, 246, 0.4);
}

.bit-host {
  background: rgba(6, 182, 212, 0.15);
  color: #67e8f9;
  border-color: rgba(6, 182, 212, 0.3);
}

/* Tabla de resultados clave */
.results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.result-row-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.res-lbl {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.res-val-wrapper {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.res-val {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.btn-copy-val {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.btn-copy-val:hover {
  color: var(--accent-cyan);
  background: var(--bg-card-hover);
}

.scope-pill {
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-private { background: rgba(16, 185, 129, 0.2); color: var(--accent-green); }
.badge-public { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.badge-warning { background: rgba(245, 158, 11, 0.2); color: var(--accent-yellow); }
.badge-info { background: rgba(99, 102, 241, 0.2); color: #a5b4fc; }

/* Estilos de VLSM */
.vlsm-input-row {
  display: grid;
  grid-template-columns: 2fr 1.5fr 40px;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.btn-remove-row {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--accent-red);
  font-size: 1.25rem;
  height: 44px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.btn-remove-row:hover {
  background: var(--accent-red);
  color: #fff;
}

.vlsm-actions-bar {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

.btn-action-primary {
  background: var(--accent-blue);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.btn-action-primary:hover {
  filter: brightness(1.15);
}

.btn-action-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.btn-action-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Tabla de resultados VLSM */
.vlsm-table-container {
  overflow-x: auto;
  margin-top: 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.vlsm-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.vlsm-table th {
  background: var(--bg-card);
  padding: 0.85rem 1rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.vlsm-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.vlsm-table tr:hover td {
  background: var(--bg-card-hover);
}

.vlsm-summary-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.summary-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.summary-chip .lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.summary-chip .val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
}

/* Toast */
.app-toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #111827;
  color: #f9fafb;
  border: 1px solid var(--accent-cyan);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  z-index: 10000;
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

.app-toast.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  padding: 1rem;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
}

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

.modal-title {
  font-size: 1.2rem;
}

.modal-btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

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

.modal-body {
  padding: 1.5rem;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.btn-primary {
  background: var(--accent-cyan);
  color: #0b0f19;
  font-weight: 700;
  border: none;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

/* Responsive */
@media (max-width: 900px) {
  .bits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .results-grid {
    grid-template-columns: 1fr;
  }
  .vlsm-summary-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .form-grid-ipv4 {
    grid-template-columns: 1fr;
  }
  .bits-grid {
    grid-template-columns: 1fr;
  }
  .vlsm-input-row {
    grid-template-columns: 1fr 1fr 36px;
  }
  .vlsm-summary-cards {
    grid-template-columns: 1fr;
  }
  .btn-action-primary, .btn-action-secondary {
    width: 100%;
    justify-content: center;
  }
}