/* ============================================================================
   Airbus A320 MCDU Standalone Simulator - Layout & SimBrief Modal Styling
   ============================================================================ */

:root {
  --bg-base: #f8fafc;
  --panel-bg: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #1e293b;
  --text-muted: #64748b;
  --accent-sage: #0f766e;
  --accent-ochre: #b45309;
  --accent-terracotta: #be123c;
  --accent-slate: #0284c7;
  --font-serif: "Georgia", "Merriweather", serif;
  --font-sans: "Inter", "Segoe UI", -apple-system, sans-serif;
  --font-mono: "Share Tech Mono", monospace;
}

body {
  background-color: #0b1120;
  background-image: 
    radial-gradient(at 100% 0%, rgba(15, 118, 110, 0.12) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(2, 132, 199, 0.10) 0px, transparent 50%),
    linear-gradient(180deg, #070b14 0%, #0f172a 100%);
  color: #334155;
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================================
   APP HEADER
   ============================================================================ */
.app-header {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 10px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.aircraft-badge {
  background: linear-gradient(135deg, #0284c7, #0f766e);
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 10px;
  border-radius: 6px;
  text-transform: uppercase;
}

.header-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: #f8fafc;
  margin: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header {
  background: #1e293b;
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}
.btn-header:hover {
  background: #334155;
  color: #ffffff;
}
.btn-header.active {
  background: var(--accent-sage);
  border-color: var(--accent-sage);
  color: #fff;
}

/* Route Presets Pill Row */
.preset-pills-row {
  display: flex;
  gap: 6px;
  align-items: center;
}
.preset-label {
  font-size: 11px;
  color: #94a3b8;
  font-weight: 600;
  text-transform: uppercase;
}
.btn-preset {
  background: #1e293b;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.12s;
}
.btn-preset:hover {
  background: #334155;
  color: #ffffff;
  border-color: #0284c7;
}

/* ============================================================================
   CENTERED MCDU & ND DUAL FLIGHT DECK CONTAINER
   ============================================================================ */
.main-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 24px;
  flex: 1;
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
  padding: 16px 12px 30px;
  box-sizing: border-box;
  flex-wrap: wrap;
}

.mcdu-pane {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

/* ============================================================================
   SIMBRIEF & NAVIGRAPH MODAL DIALOG
   ============================================================================ */
.simbrief-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
  box-sizing: border-box;
}
.simbrief-modal.active {
  display: flex;
}

.simbrief-modal-box {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 22px 26px;
  max-width: 620px;
  width: 100%;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4);
  position: relative;
  animation: modalFadeIn 0.2s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

.sb-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sb-modal-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.btn-close-modal {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: #475569;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  transition: all 0.12s;
}
.btn-close-modal:hover {
  background: #e2e8f0;
  color: #0f172a;
}

/* Connection input row */
.sb-connect-row {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.sb-input {
  flex: 1;
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-primary);
  outline: none;
}
.sb-input:focus {
  border-color: var(--accent-slate);
}

.sb-status-banner {
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.45;
  margin-bottom: 14px;
  white-space: pre-line;
}
.sb-status-banner.success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #166534;
}
.sb-status-banner.warning {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #854d0e;
}
.sb-status-banner.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}

/* Data grid */
.ofp-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 14px;
}

.ofp-item {
  display: flex;
  flex-direction: column;
}
.ofp-label {
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 2px;
}
.ofp-value {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.ofp-route-box {
  background: #0f172a;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 10px 12px;
  border-radius: 6px;
  margin-bottom: 14px;
  word-break: break-all;
  border: 1px solid #1e293b;
}

.sb-links-bar {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.btn-tutor {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary {
  background: var(--accent-sage);
  color: #ffffff;
}
.btn-primary:hover {
  background: #095851;
}

.btn-secondary {
  background: #f1f5f9;
  color: #334155;
  border-color: #cbd5e1;
}
.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-navigraph {
  background: #1e1b4b;
  color: #a5b4fc;
  border: 1px solid #4338ca;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}
.btn-navigraph:hover {
  background: #312e81;
  color: #ffffff;
}

/* ============================================================================
   MOBILE RESPONSIVE NAVIGATION & LAYOUT (TABLETS & PHONES)
   ============================================================================ */

/* Mobile Nav Tabs Segmented Switcher (Default: Hidden on Desktop) */
.mobile-nav-tabs {
  display: none;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 12px;
  gap: 8px;
  position: sticky;
  top: 52px;
  z-index: 90;
  justify-content: center;
}

.mobile-tab-btn {
  flex: 1;
  max-width: 220px;
  background: #1e293b;
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: all 0.15s ease;
}

.mobile-tab-btn:hover {
  background: #334155;
  color: #f1f5f9;
}

.mobile-tab-btn.active {
  background: linear-gradient(135deg, #0f766e, #0d9488);
  border-color: #14b8a6;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(15, 118, 110, 0.4);
}

/* Responsive Breakpoint: Tablets and Narrow Screens (<= 820px) */
@media (max-width: 820px) {
  .mobile-nav-tabs {
    display: flex;
  }

  .preset-pills-row {
    display: none;
  }

  .app-header {
    padding: 8px 12px;
  }

  .header-title {
    font-size: 15px;
  }

  .main-container {
    padding: 10px 4px 20px;
    gap: 12px;
  }

  /* Single-Instrument View Mode on Mobile */
  body.mobile-view-mcdu #ndPane {
    display: none !important;
  }
  body.mobile-view-mcdu .mcdu-pane {
    display: flex !important;
  }

  body.mobile-view-nd .mcdu-pane {
    display: none !important;
  }
  body.mobile-view-nd #ndPane {
    display: flex !important;
  }

  /* Modal responsiveness */
  .simbrief-modal-box {
    padding: 16px 14px;
    max-height: 90vh;
    overflow-y: auto;
  }

  .sb-grid-2 {
    grid-template-columns: 1fr !important;
    gap: 8px !important;
  }
}

/* Responsive Breakpoint: Phones (<= 480px) */
@media (max-width: 480px) {
  .app-header {
    padding: 6px 8px;
  }

  .aircraft-badge {
    font-size: 9px;
    padding: 2px 6px;
  }

  .header-title {
    font-size: 13px;
  }

  .btn-header {
    padding: 4px 8px;
    font-size: 11px;
  }

  #volumeSlider {
    display: none;
  }

  .mobile-tab-btn {
    font-size: 12px;
    padding: 6px 10px;
  }

  .main-container {
    padding: 6px 2px 16px;
  }
}