/* ==========================================================================
   SELF-HOSTED TYPOGRAPHY (fully offline)
   Fonts vendored locally under ./fonts/ (SIL OFL licensed):
     - Inter-Variable.woff2  (wght axis 100-900, covers 400/600/700)
     - Orbitron-Bold.woff2   (700)
   No external requests at load. Fallback stack is system-ui.
   ========================================================================== */
@font-face {
  font-family: 'Inter';
  src: url('./fonts/Inter-Variable.woff2') format('woff2');
  font-weight: 100 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Orbitron';
  src: url('./fonts/Orbitron-Bold.woff2') format('woff2');
  font-weight: 700; font-style: normal; font-display: swap;
}

/* ==========================================================================
   DESIGN TOKENS & RESET SYSTEM
   ========================================================================== */

@layer reset, base, theme, components, layout, utilities;

@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body {
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--color-text-main);
    background-color: var(--color-bg-space);
  }

  button, input, select {
    font: inherit;
    color: inherit;
    background: none;
    border: none;
  }

  button {
    cursor: pointer;
  }
}

@layer theme {
  :root {
    /* Color Space: Interpolation overrides */
    --in-oklab: in oklab;
    --in-oklch: in oklch;

    /* Palette Tokens */
    --color-bg-space: #03030c;
    --color-text-main: #f0f4f8;
    --color-text-muted: #8fa0b0;
    
    /* Neon Accents */
    --color-accent-blue: #00d2ff;
    --color-accent-cyan: #00f5d4;
    --color-accent-gold: #ffbe0b;
    --color-accent-red: #ff0055;
    --color-accent-purple: #9b5de5;

    /* Glass Panels */
    --glass-bg: rgba(8, 12, 28, 0.55);
    --glass-bg-hover: rgba(14, 21, 48, 0.7);
    --glass-border: rgba(0, 210, 255, 0.15);
    --glass-border-active: rgba(0, 210, 255, 0.35);
    --glass-glow: 0 8px 32px 0 rgba(0, 0, 0, 0.8), 0 0 16px 0 rgba(0, 212, 255, 0.05);
    --glass-glow-active: 0 8px 32px 0 rgba(0, 0, 0, 0.9), 0 0 24px 0 rgba(0, 212, 255, 0.15);
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  }
}

/* ==========================================================================
   BASE & LAYOUT STYLES
   ========================================================================== */

@layer base {
  .background-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
  }

  /* Scrollbars */
  .sidebar-scroll-container {
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent-blue) rgba(0, 0, 0, 0.2);
  }

  .sidebar-scroll-container::-webkit-scrollbar {
    width: 6px;
  }

  .sidebar-scroll-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
  }

  .sidebar-scroll-container::-webkit-scrollbar-thumb {
    background-color: var(--color-accent-blue);
    border-radius: 3px;
  }
}

@layer layout {
  .app-container {
    display: grid;
    grid-template-rows: 1fr;
    grid-template-columns: 1fr auto;
    grid-template-areas: "viewport sidebar";
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    transition: grid-template-columns 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .viewport-area {
    grid-area: viewport;
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
  }

  .sidebar-hud {
    grid-area: sidebar;
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
    width: 450px;
    height: 100%;
    background: var(--glass-bg);
    border-left: 1px solid var(--glass-border);
    backdrop-filter: blur(20px) saturate(140%);
    box-shadow: var(--glass-glow);
    z-index: 5;
    overflow: hidden;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), height 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  /* Desktop collapsed state: collapses width to tab icon bar flush to farthest right */
  .sidebar-hud.collapsed {
    width: 75px;
  }

  /* The desktop rail stays interactive when collapsed, but it must not dim the
     part of the simulation behind it. Keep this desktop-only: the compact
     bottom drawer on narrow screens still needs its solid control surface. */
  @media (min-width: 1025px) {
    .app-container.sidebar-collapsed {
      grid-template-columns: 1fr 0;
    }

    .app-container.sidebar-collapsed .sidebar-hud {
      position: absolute;
      top: 0;
      right: 0;
    }

    .sidebar-hud.collapsed,
    .sidebar-hud.collapsed .sidebar-tabs {
      background: transparent;
      border-left-color: transparent;
      backdrop-filter: none;
      box-shadow: none;
    }

    .sidebar-hud.collapsed .tab-btn,
    .sidebar-hud.collapsed .tab-btn.active {
      background: transparent;
      box-shadow: none;
    }
  }

  /* Auto-hide state: panel slides off to the farthest right when mouse is away */
  .sidebar-hud.auto-hidden {
    transform: translateX(calc(100% - 14px)) !important;
    opacity: 0.5;
  }

  .sidebar-hud.auto-hidden:hover,
  .sidebar-hud.mouse-near-right {
    transform: translateX(0) !important;
    opacity: 1 !important;
    border-color: var(--glass-border-active);
    box-shadow: var(--glass-glow-active);
  }

  .sidebar-hud.collapsed .sidebar-scroll-container {
    display: none;
  }

  .sidebar-hud.collapsed .tab-btn span {
    display: none;
  }

  .sidebar-hud.collapsed .icon-collapse {
    transform: rotate(180deg);
  }

  /* Responsive layout for smaller / tablet / split screens */
  @media (max-width: 1024px) {
    .app-container {
      display: block;
      position: relative;
      width: 100vw;
      height: 100vh;
      height: 100dvh;
      overflow: hidden;
    }

    .viewport-area {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
    }

    .sidebar-hud {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      width: 100%;
      max-height: 380px;
      height: 42vh;
      border-left: none;
      border-top: 1px solid var(--glass-border);
      flex-direction: column;
      z-index: 5;
      transition: height 0.3s cubic-bezier(0.4, 0, 0.2, 1), max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .sidebar-hud.collapsed {
      width: 100%;
      height: 56px;
      max-height: 56px;
      overflow: hidden;
    }

    .sidebar-tabs {
      flex-direction: row !important;
      border-right: none !important;
      border-bottom: 1px solid var(--glass-border);
      min-height: 56px;
      height: 56px;
      width: 100% !important;
      overflow-x: auto;
    }

    .sidebar-scroll-container {
      height: calc(100% - 56px) !important;
    }
  }

  /* Phone layout: keep the model visible first, then reveal concise controls
     and the reference panel with touch-sized targets. The JS mobile mode also
     starts both surfaces in their compact states. */
  @media (max-width: 760px) {
    .app-container.mobile-experience .sidebar-hud {
      height: min(68dvh, 520px);
      max-height: min(68dvh, 520px);
    }

    .app-container.mobile-experience .sidebar-hud.collapsed {
      height: 56px;
      max-height: 56px;
    }

    .mobile-experience .bottom-control-container {
      box-sizing: border-box;
      right: 0.5rem;
      bottom: calc(56px + env(safe-area-inset-bottom) + 0.5rem);
      left: 0.5rem;
      min-width: 0;
    }

    .mobile-experience .unified-control-tile {
      box-sizing: border-box;
      width: 100%;
      max-width: none;
      max-height: calc(100dvh - 8rem);
      min-width: 0;
      overflow-y: auto;
      padding: 0.5rem;
      border-radius: 12px;
    }

    .mobile-experience .unified-control-tile.dismissed {
      width: auto;
      min-width: 72px;
      padding: 0.45rem 0.85rem;
    }

    .mobile-experience .tile-handle-bar {
      width: 56px;
      height: 6px;
    }

    .mobile-experience .tile-dismiss-btn {
      top: 4px;
      right: 4px;
      width: 36px;
      height: 36px;
      font-size: 1rem;
    }

    .mobile-experience .tile-content {
      align-items: stretch;
      flex-direction: column;
      flex-wrap: nowrap;
      width: 100%;
      min-width: 0;
      gap: 0.55rem;
    }

    .mobile-experience .control-group {
      justify-content: center;
      width: 100%;
      min-width: 0;
      flex-wrap: wrap;
      gap: 0.45rem;
    }

    .mobile-experience .hud-stats-group {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .mobile-experience .hud-audio {
      justify-content: space-between;
    }

    .mobile-experience .hud-btn.flex-btn {
      flex: 1 1 128px;
    }

    .mobile-experience .tile-divider {
      display: none;
    }

    .mobile-experience .hud-stats-group .stat-item:nth-child(n + 3) {
      display: none;
    }

    .mobile-experience .hud-btn,
    .mobile-experience .tab-btn {
      min-width: 44px;
      min-height: 44px;
    }

    .mobile-experience .sidebar-scroll-container {
      padding: 0.75rem;
    }

    .mobile-experience .canvas-help-overlay {
      right: 0.75rem;
      left: 0.75rem;
      text-align: center;
    }
  }

  /* On phones, the selected reference panel belongs below the model rather
     than floating over it. This preserves an uninterrupted space for the
     orbital diagram while keeping every panel reachable by normal scrolling. */
  @media (max-width: 760px) {
    body.mobile-experience {
      width: 100%;
      min-height: 100dvh;
      height: auto;
      overflow: auto;
    }

    .app-container.mobile-experience {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      grid-template-rows: minmax(360px, 62dvh) auto;
      grid-template-areas:
        "viewport"
        "sidebar";
      width: 100%;
      min-height: 100dvh;
      height: auto;
      overflow: visible;
    }

    .app-container.mobile-experience .viewport-area {
      position: relative;
      width: 100%;
      height: 100%;
      min-height: 0;
    }

    .app-container.mobile-experience .sidebar-hud {
      position: relative;
      inset: auto;
      width: 100%;
      height: auto;
      max-height: none;
      overflow: visible;
    }

    .app-container.mobile-experience .sidebar-hud:not(.collapsed) {
      height: auto;
      max-height: none;
    }

    .app-container.mobile-experience .sidebar-tabs {
      order: 0;
    }

    .app-container.mobile-experience .sidebar-scroll-container {
      order: 1;
      flex: none;
      height: auto !important;
      max-height: 64dvh;
      overflow-y: auto;
    }

    .app-container.mobile-experience .bottom-control-container {
      bottom: calc(env(safe-area-inset-bottom) + 0.5rem);
    }
  }
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */

@layer components {
  /* Logo & Title */
  .header-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .logo-icon {
    filter: drop-shadow(0 0 6px var(--color-accent-blue));
  }

  .header-logo h1 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 1.35rem;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--in-oklab), #fff, var(--color-accent-blue));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.15em;
  }

  .header-logo h1 span {
    font-weight: 500;
    opacity: 0.8;
  }

  /* HUD Stats */
  .hud-stats {
    display: flex;
    gap: 2rem;
  }

  .stat-item {
    display: flex;
    flex-direction: column;
  }

  .stat-item .label {
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 1px;
  }

  .stat-item .value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent-blue);
    text-shadow: 0 0 8px rgba(0, 210, 255, 0.4);
    letter-spacing: 0.5px;
  }

  /* Audio Interface */
  .hud-audio {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.03);
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
  }

  .volume-slider-container {
    display: flex;
    align-items: center;
    width: 60px;
    transition: width var(--transition-normal);
  }

  .volume-slider-container:hover,
  .volume-slider-container:focus-within {
    width: 100px;
  }

  .volume-slider-container input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    outline: none;
  }

  .volume-slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent-blue);
    box-shadow: 0 0 6px var(--color-accent-blue);
    cursor: pointer;
  }

  /* Simulation Canvas HUD Overlays */
  .canvas-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
  }

  .three-viewport { width: 100%; height: 100%; cursor: grab; }
  .three-viewport:active { cursor: grabbing; }

  /* Unified Bottom Control Tile Container (Proximity Auto-Hide) */
  .bottom-control-container {
    position: absolute;
    bottom: 1.25rem;
    left: 1.5rem;
    right: 1.5rem;
    z-index: 10;
    pointer-events: none;
    display: flex;
    justify-content: flex-start;
  }

  .unified-control-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-glow);
    backdrop-filter: blur(16px) saturate(160%);
    pointer-events: auto;
    padding: 0.5rem 1rem 0.75rem;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    transform: translateY(0);
    opacity: 1;
    max-width: calc(100% - 2rem);
  }

  .tile-handle-bar {
    width: 44px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: background 0.2s ease, width 0.2s ease;
  }

  .unified-control-tile:hover .tile-handle-bar {
    background: var(--color-accent-blue);
    width: 56px;
  }

  /* Dismissed state: collapses to just the handle bar (click handle to expand) */
  .unified-control-tile.dismissed {
    padding: 0.4rem 0.75rem;
  }
  .unified-control-tile.dismissed .tile-handle-bar {
    margin-bottom: 0;
  }
  .unified-control-tile.dismissed .tile-content {
    display: none;
  }
  .unified-control-tile.dismissed .tile-dismiss-btn {
    display: none;
  }

  /* Dismiss button (✕) top-right of the control tile */
  .tile-dismiss-btn {
    position: absolute;
    top: 6px;
    right: 8px;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    line-height: 1;
    color: var(--color-text-muted);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  }
  .tile-dismiss-btn:hover {
    color: var(--color-accent-gold);
    border-color: rgba(255, 190, 11, 0.4);
    background: rgba(255, 190, 11, 0.08);
  }

  .tile-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
  }

  .control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .tile-divider {
    width: 1px;
    height: 28px;
    background: rgba(255, 255, 255, 0.12);
  }

  .hud-stats-group {
    display: flex;
    align-items: center;
    gap: 0.85rem;
  }

  .stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum";
  }

  #sim-date {
    min-width: 145px;
    flex-shrink: 0;
  }

  #focused-body-stat {
    min-width: 135px;
    flex-shrink: 0;
  }

  #telemetry-speed-item {
    min-width: 100px;
    flex-shrink: 0;
  }

  #telemetry-light-item {
    min-width: 90px;
    flex-shrink: 0;
  }

  .hud-panel {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.65rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: var(--glass-glow);
    backdrop-filter: blur(12px);
    pointer-events: auto;
    transition: border var(--transition-fast), box-shadow var(--transition-fast);
  }

  .hud-panel:hover {
    border-color: var(--glass-border-active);
    box-shadow: var(--glass-glow-active);
  }

  .hud-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-text-main);
    transition: all var(--transition-fast);
  }

  .hud-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.2);
  }

  .hud-btn:focus-visible {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 2px;
  }

  button:focus-visible,
  input:focus-visible,
  select:focus-visible {
    outline: 3px solid var(--color-accent-gold);
    outline-offset: 3px;
  }

  .circle-btn {
    border-radius: 50%;
    aspect-ratio: 1;
    width: 36px;
    height: 36px;
  }

  .icon-btn {
    aspect-ratio: 1;
    width: 36px;
    height: 36px;
  }

  .flex-btn {
    padding: 0.5rem 1rem;
    gap: 0.5rem;
    min-width: 110px;
  }

  .flex-btn.active-state {
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
    background: rgba(0, 210, 255, 0.1);
  }

  .text-btn {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.4rem 1rem;
    line-height: 1.1;
  }

  .text-btn .sub-label {
    font-size: 0.6rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
  }

  .text-btn .main-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent-gold);
    text-shadow: 0 0 6px rgba(255, 190, 11, 0.3);
  }

  .toggle-btn {
    font-size: 0.75rem;
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 0.5px;
    padding: 0.5rem 0.9rem;
    opacity: 0.5;
  }

  .toggle-btn.active {
    opacity: 1;
    color: var(--color-accent-cyan);
    border-color: var(--color-accent-cyan);
    background: rgba(0, 245, 212, 0.08);
    box-shadow: 0 0 10px rgba(0, 245, 212, 0.15);
  }

  .divider {
    width: 1px;
    height: 24px;
    background: rgba(255, 255, 255, 0.1);
  }

  .slider-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .slider-control label {
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
  }

  .slider-control input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
  }

  .slider-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-text-main);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
  }

  .slider-control input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--color-accent-blue);
    transform: scale(1.2);
  }

  .hud-value {
    font-size: 0.8rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-blue);
    min-width: 35px;
    text-align: right;
  }

  .canvas-help-overlay {
    position: absolute;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(8, 12, 28, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    text-align: center;
  }

  .webgl-fallback {
    position: absolute;
    inset: 2rem auto auto 2rem;
    z-index: 10;
    max-width: 28rem;
    padding: 1rem 1.25rem;
    border: 1px solid var(--color-accent-gold);
    border-radius: 10px;
    background: rgba(8, 12, 28, 0.94);
    box-shadow: var(--glass-glow-active);
  }

  .webgl-fallback h2 {
    margin-bottom: 0.4rem;
    color: var(--color-accent-gold);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
  }

  .webgl-fallback p {
    color: var(--color-text-main);
    font-size: 0.85rem;
    line-height: 1.5;
  }

  /* ==========================================================================
     SIDEBAR NAV & TAB CONTAINERS
     ========================================================================== */

  .sidebar-tabs {
    order: 2;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--glass-border);
    border-right: none;
    min-width: 75px;
    width: 75px;
    background: rgba(0, 0, 0, 0.25);
  }

  .tab-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    flex: 1;
    padding: 0.75rem 0.25rem;
    color: var(--color-text-muted);
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
    letter-spacing: 0.5px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    transition: all var(--transition-fast);
  }

  .tab-btn:hover {
    color: var(--color-text-main);
    background: rgba(255, 255, 255, 0.02);
  }

  .tab-btn.active {
    color: var(--color-accent-blue);
    background: rgba(0, 210, 255, 0.05);
    border-right: 2px solid var(--color-accent-blue);
    border-left: none;
    box-shadow: inset -4px 0 10px rgba(0, 210, 255, 0.05);
  }

  .tab-icon {
    transition: transform var(--transition-normal);
  }

  .tab-btn:hover .tab-icon {
    transform: scale(1.1);
  }

  .tab-btn.active .tab-icon {
    filter: drop-shadow(0 0 4px var(--color-accent-blue));
  }

  .sidebar-scroll-container {
    flex: 1;
    height: 100%;
    overflow-y: auto;
    padding: 1.5rem;
    position: relative;
  }

  .tab-panel {
    display: none;
    animation: panel-fade-in var(--transition-normal) forwards;
  }

  .learning-guide {
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid rgba(0, 245, 212, 0.35);
    border-radius: 10px;
    background: rgba(0, 245, 212, 0.06);
  }

  .learning-guide h2 {
    margin-bottom: 0.6rem;
    color: var(--color-accent-cyan);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
  }

  .learning-guide ol {
    display: grid;
    gap: 0.45rem;
    padding-left: 1.25rem;
    color: var(--color-text-main);
    font-size: 0.82rem;
    line-height: 1.35;
  }

  .eyebrow,
  .model-note {
    color: var(--color-text-muted);
    font-size: 0.72rem;
    line-height: 1.45;
  }

  .eyebrow {
    margin-bottom: 0.35rem;
    color: var(--color-accent-gold);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.58rem;
    letter-spacing: 0.08em;
  }

  .model-note {
    margin-top: 0.55rem;
    padding-left: 0.7rem;
    border-left: 2px solid var(--color-accent-gold);
  }

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

  @keyframes panel-fade-in {
    from {
      opacity: 0;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* ==========================================================================
     TAB: OVERVIEW (Planet details card)
     ========================================================================== */

  .planet-quick-selector {
    display: flex;
    justify-content: space-between;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.03);
  }

  .selector-dot {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-size: 1rem;
    color: var(--color-text-muted);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-fast);
  }

  .selector-dot:hover {
    color: var(--color-accent-blue);
    background: rgba(0, 210, 255, 0.08);
    border-color: var(--color-accent-blue);
    transform: scale(1.1);
  }

  .selector-dot.active {
    color: var(--color-accent-gold);
    background: rgba(255, 190, 11, 0.1);
    border-color: var(--color-accent-gold);
    box-shadow: 0 0 8px rgba(255, 190, 11, 0.2);
  }

  .details-card {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 1rem;
  }

  .classification-badge {
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-cyan);
    background: rgba(0, 245, 212, 0.1);
    border: 1px solid var(--color-accent-cyan);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 0.4rem;
  }

  .card-header h2 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 1.8rem;
    letter-spacing: 1px;
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.1);
  }

  .pronunciation {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-style: italic;
  }

  .planet-symbol-container {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 10px rgba(0, 210, 255, 0.05);
  }

  .description-text {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--color-text-muted);
    text-wrap: pretty;
  }

  .properties-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .data-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }

  .data-box .label {
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
  }

  .data-box .value {
    font-size: 1.05rem;
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-accent-blue);
  }

  .data-box .sub {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Temperature Profile Component */
  .temp-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 0.75rem;
  }

  .temp-section .label {
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
  }

  .temp-bar-container {
    position: relative;
    height: 8px;
    width: 100%;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    overflow: hidden;
    margin: 0.25rem 0;
  }

  .temp-gradient-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, var(--in-oklab), #00d2ff, #00f5d4, #ffbe0b, #ff0055);
  }

  .temp-range-indicator {
    position: absolute;
    top: 0;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    border: 1.5px solid #fff;
    border-radius: 4px;
    box-shadow: 0 0 8px #fff;
  }

  .temp-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--color-text-muted);
  }

  .temp-labels span {
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
  }

  .temp-labels .label-mid {
    font-family: 'Inter', sans-serif;
    font-size: 0.6rem;
    letter-spacing: 0.5px;
  }

  /* Cosmic facts */
  .fact-section h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
  }

  .facts-list {
    list-style-type: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .facts-list li {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1rem;
  }

  .facts-list li::before {
    content: "▫";
    position: absolute;
    left: 0;
    color: var(--color-accent-blue);
    font-weight: bold;
  }

  /* ==========================================================================
     TAB: GRAVITY LAB
     ========================================================================== */

  .gravity-controls {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1rem;
  }

  .gravity-visual-box {
    position: relative;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.4);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.6);
    overflow: hidden;
  }

  .gravity-stage {
    position: relative;
    width: 100%;
    height: 250px;
  }

  .stage-sky {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 220px;
    background: linear-gradient(to bottom, #020208, #05051a);
  }

  .stage-ground {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30px;
    background: #141923;
    border-top: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 10px 20px rgba(0, 0, 0, 0.8);
  }

  .stage-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 220px;
    pointer-events: none;
  }

  .grid-line {
    position: absolute;
    left: 0;
    width: 100%;
    border-top: 1px dashed rgba(0, 210, 255, 0.08);
    display: flex;
    justify-content: flex-end;
    padding-right: 0.5rem;
  }

  .grid-line span {
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    color: rgba(0, 210, 255, 0.3);
    transform: translateY(-50%);
  }

  .astronaut-sprite {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    will-change: bottom, transform;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .jump-height-tag {
    background: rgba(0, 210, 255, 0.2);
    border: 1px solid var(--color-accent-blue);
    color: #fff;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.6rem;
    font-weight: 700;
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    margin-bottom: 0.25rem;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
  }

  .jump-height-tag.show {
    opacity: 1;
    transform: translateY(0);
  }

  .gravity-ui {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .gravity-stats {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.75rem;
  }

  .stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .stat-row .label {
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
  }

  .stat-row .value {
    font-size: 0.9rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-cyan);
  }

  .primary-action-btn {
    width: 100%;
    padding: 0.85rem;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--in-oklab), var(--color-accent-blue), var(--color-accent-purple));
    color: #fff;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 1px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 15px rgba(155, 93, 229, 0.2);
    transition: all var(--transition-fast);
  }

  .primary-action-btn:hover:not(:disabled) {
    box-shadow: 0 4px 20px rgba(0, 210, 255, 0.4), 0 0 15px var(--color-accent-blue);
    transform: translateY(-1.5px);
  }

  .primary-action-btn:active:not(:disabled) {
    transform: translateY(0.5px);
  }

  .primary-action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
  }

  /* ==========================================================================
     TAB: COMPARE
     ========================================================================== */

  .compare-selectors {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 1rem 0 1.5rem 0;
  }

  .select-col {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .select-col label {
    font-size: 0.6rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
  }

  .hud-select {
    background: rgba(8, 12, 28, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.5rem;
    color: var(--color-text-main);
    font-size: 0.85rem;
    width: 100%;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' width='12' height='12' fill='none' stroke='%2300d2ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 10px;
    padding-right: 2rem;
    transition: border var(--transition-fast);
  }

  .hud-select:focus {
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 8px rgba(0, 210, 255, 0.1);
  }

  .comparison-display {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .compare-stat-block {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .comparison-title {
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
  }

  .compare-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
  }

  .compare-row .val-left {
    font-weight: 700;
    color: var(--color-accent-blue);
    font-family: 'Orbitron', sans-serif;
  }

  .compare-row .val-right {
    font-weight: 700;
    color: var(--color-accent-purple);
    font-family: 'Orbitron', sans-serif;
  }

  .compare-row .label {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    font-family: 'Orbitron', sans-serif;
    opacity: 0.8;
  }

  .comparison-bar-pair {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    width: 100%;
  }

  .compare-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
    width: 100%;
    position: relative;
  }

  .compare-bar.bar-left .fill {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    background: var(--color-accent-blue);
    border-radius: 4px;
    box-shadow: 0 0 6px var(--color-accent-blue);
    transition: width var(--transition-normal) ease-out;
  }

  .compare-bar.bar-right .fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: var(--color-accent-purple);
    border-radius: 4px;
    box-shadow: 0 0 6px var(--color-accent-purple);
    transition: width var(--transition-normal) ease-out;
  }

  /* ==========================================================================
     TAB: MISSION LAUNCH
     ========================================================================== */

  .mission-setup-card {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1rem;
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .form-group label {
    font-size: 0.6rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
  }

  .launch-parameters {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 0.75rem;
  }

  .slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .slider-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.65rem;
  }

  .slider-header label {
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
  }

  .slider-header span {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-cyan);
  }

  .slider-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    outline: none;
  }

  .slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-accent-blue);
    box-shadow: 0 0 6px var(--color-accent-blue);
    cursor: pointer;
    transition: transform var(--transition-fast);
  }

  .slider-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
  }

  .mission-feedback {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 0.65rem;
    border-radius: 6px;
  }

  .status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
  }

  .status-indicator.standby {
    background: var(--color-accent-gold);
    box-shadow: 0 0 8px var(--color-accent-gold);
    animation: indicator-pulse 2s infinite;
  }

  .status-indicator.flight {
    background: var(--color-accent-blue);
    box-shadow: 0 0 8px var(--color-accent-blue);
    animation: indicator-pulse 1s infinite;
  }

  .status-indicator.success {
    background: var(--color-accent-cyan);
    box-shadow: 0 0 8px var(--color-accent-cyan);
  }

  .status-indicator.lost {
    background: var(--color-accent-red);
    box-shadow: 0 0 8px var(--color-accent-red);
  }

  @keyframes indicator-pulse {
    0% { opacity: 0.4; }
    50% { opacity: 1; }
    100% { opacity: 0.4; }
  }

  .mission-status-text {
    font-size: 0.7rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
  }

  .mission-buttons {
    display: flex;
    gap: 0.75rem;
  }

  .secondary-btn {
    flex: 1;
    padding: 0.85rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.02);
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    transition: all var(--transition-fast);
    text-align: center;
  }

  .secondary-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
  }

  .flight-data-card {
    background: rgba(8, 12, 28, 0.4);
    border: 1px solid rgba(0, 210, 255, 0.1);
    border-radius: 8px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .flight-data-card h3 {
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
  }

  .telemetry-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  .tel-item {
    display: flex;
    flex-direction: column;
  }

  .tel-item .label {
    font-size: 0.55rem;
    color: var(--color-text-muted);
  }

  .tel-item .value {
    font-size: 0.85rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-blue);
  }

  /* ==========================================================================
     TAB: QUIZ
     ========================================================================== */

  .quiz-welcome-screen,
  .quiz-results-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 0;
    gap: 1.5rem;
  }

  .tab-instructions {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-text-muted);
    text-wrap: pretty;
  }

  .quiz-active-screen {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 0.5rem;
  }

  .quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .question-tracker {
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
  }

  .score-display {
    font-size: 0.75rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-gold);
  }

  .quiz-progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
    width: 100%;
    overflow: hidden;
  }

  .progress-fill {
    height: 100%;
    background: var(--color-accent-blue);
    border-radius: 2px;
    box-shadow: 0 0 6px var(--color-accent-blue);
    transition: width var(--transition-normal);
  }

  .question-container h3 {
    font-size: 1.05rem;
    line-height: 1.5;
    margin-bottom: 1.25rem;
    color: var(--color-text-main);
  }

  .options-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
  }

  .option-btn {
    text-align: left;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
  }

  .option-btn:hover:not(:disabled) {
    background: rgba(0, 210, 255, 0.05);
    border-color: var(--color-accent-blue);
    padding-left: 1.25rem;
  }

  .option-btn.selected {
    background: rgba(0, 210, 255, 0.1);
    border-color: var(--color-accent-blue);
    font-weight: 600;
  }

  .option-btn.correct {
    background: rgba(0, 245, 212, 0.15) !important;
    border-color: var(--color-accent-cyan) !important;
    color: var(--color-accent-cyan) !important;
    font-weight: 600;
  }

  .option-btn.wrong {
    background: rgba(255, 0, 85, 0.1) !important;
    border-color: var(--color-accent-red) !important;
    color: var(--color-accent-red) !important;
  }

  .quiz-explanation-box {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    background: rgba(8, 12, 28, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    animation: panel-fade-in var(--transition-normal);
  }

  .explanation-heading {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
  }

  .explanation-heading.correct-text {
    color: var(--color-accent-cyan);
  }

  .explanation-heading.wrong-text {
    color: var(--color-accent-red);
  }

  .explanation-body {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-text-muted);
  }

  /* Quiz Results Screen */
  .rank-display {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .rank-display .label {
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
    letter-spacing: 1px;
  }

  .rank-display .value {
    font-size: 1.4rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    color: var(--color-accent-gold);
    text-shadow: 0 0 10px rgba(255, 190, 11, 0.3);
  }

  .quiz-results-stats {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .quiz-best-badge {
    align-self: center;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-accent-cyan);
    background: rgba(0, 245, 212, 0.08);
    border: 1px solid rgba(0, 245, 212, 0.25);
    border-radius: 6px;
    padding: 0.25rem 0.75rem;
  }

  /* Scale mode distortion disclosure (inline, no popup) */
  .scale-disclosure {
    margin-top: 0.25rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--color-accent-gold);
    max-width: 220px;
    line-height: 1.3;
    text-align: center;
    opacity: 0;
    transition: opacity 0.2s ease;
  }
  .scale-disclosure:not(:empty) {
    opacity: 1;
  }

  /* Special Action Tool Buttons */
  .special-btn {
    border-color: rgba(0, 210, 255, 0.4);
    background: rgba(0, 210, 255, 0.1);
    color: var(--color-accent-cyan);
  }
  .warning-btn {
    border-color: rgba(255, 140, 0, 0.5);
    background: rgba(255, 100, 0, 0.15);
    color: #ff9d00;
  }
  .warning-btn.active, .warning-btn:hover {
    box-shadow: 0 0 12px rgba(255, 140, 0, 0.4);
  }
  .action-btn.active {
    border-color: var(--color-accent-cyan);
    background: rgba(0, 245, 212, 0.2);
    color: var(--color-accent-cyan);
  }
  .highlight-btn {
    border-color: rgba(255, 190, 11, 0.5);
    background: rgba(255, 190, 11, 0.15);
    color: var(--color-accent-gold);
  }

  /* Exoplanet Builder Styles */
  .exoplanet-preview-card {
    background: rgba(8, 12, 28, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }
  .exoplanet-canvas-container canvas {
    border-radius: 10px;
    background: radial-gradient(circle, #070a1a 0%, #010206 100%);
  }
  .habitability-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    background: rgba(0, 245, 212, 0.12);
    border: 1px solid var(--color-accent-cyan);
    text-align: center;
  }
  .badge-status {
    font-size: 0.75rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-cyan);
  }
  .badge-sub {
    font-size: 0.6rem;
    color: var(--color-text-muted);
  }
  .exo-controls-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
  }
  .exo-control-item {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }
  .control-label-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    font-family: 'Orbitron', sans-serif;
  }
  .exo-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 1rem;
  }
  .exo-stats-grid .stat-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }
  .exo-stats-grid .stat-box .label {
    font-size: 0.55rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-muted);
  }
  .exo-stats-grid .stat-box .value {
    font-size: 0.85rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--color-accent-gold);
  }

  /* Cinematic Tour Overlay */
  .tour-banner {
    position: absolute;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border-active);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6), var(--glass-glow-active);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    z-index: 50;
    backdrop-filter: blur(16px);
    max-width: 650px;
    width: 90vw;
  }
  .tour-step-badge {
    font-size: 0.6rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--color-accent-gold);
    letter-spacing: 1px;
  }
  .tour-info h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.05rem;
    color: var(--color-accent-cyan);
    margin-top: 0.2rem;
  }
  .tour-info p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
  }
  .tour-actions {
    display: flex;
    gap: 0.5rem;
  }

  /* ==========================================================================
     GLOBAL HELPER LAYERS & UTILITIES
     ========================================================================== */

  .hidden {
    display: none !important;
  }
}