/**
 * AirGap Protocol - Dark Cyberpunk Design System v2.3.0
 * Ultra-Fluid 120Hz Animations, Spring Physics, Mobile Thumb Navigation & Multi-File List
 */

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0d121d;
  --bg-tertiary: #131b2a;
  --bg-glass: rgba(13, 18, 29, 0.85);
  --border-glow: rgba(0, 240, 255, 0.25);
  --border-active: #00f0ff;
  
  --neon-cyan: #00f0ff;
  --neon-green: #39ff14;
  --neon-magenta: #ff007f;
  --neon-amber: #ffb703;
  --neon-crimson: #ff1744;
  
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --text-dim: #484f58;

  --font-mono: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', 'Cascadia Code', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --glow-cyan: 0 0 16px rgba(0, 240, 255, 0.4);
  --glow-green: 0 0 16px rgba(57, 255, 20, 0.4);
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Theme variations */
body[data-theme="matrix"] {
  --border-active: #39ff14;
  --border-glow: rgba(57, 255, 20, 0.25);
  --neon-cyan: #39ff14;
}
body[data-theme="amber"] {
  --border-active: #ffb703;
  --border-glow: rgba(255, 183, 3, 0.25);
  --neon-cyan: #ffb703;
}
body[data-theme="crimson"] {
  --border-active: #ff007f;
  --border-glow: rgba(255, 0, 127, 0.25);
  --neon-cyan: #ff007f;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 240, 255, 0.06) 0%, transparent 60%),
    linear-gradient(to bottom, transparent 95%, rgba(0, 240, 255, 0.02) 100%);
  padding-bottom: 70px;
}

@media (min-width: 769px) {
  body {
    padding-bottom: 0;
  }
}

body::before {
  content: " ";
  display: block;
  position: fixed;
  top: 0; left: 0; bottom: 0; right: 0;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%);
  background-size: 100% 4px;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.35;
}

/* Header & Top Bar */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glow);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-logo {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  border: 1.5px solid var(--border-glow);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease;
  object-fit: cover;
}

.brand-logo:hover {
  transform: scale(1.08);
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.7);
}

.brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--neon-cyan);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.airgap-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(57, 255, 20, 0.1);
  border: 1px solid var(--neon-green);
  color: var(--neon-green);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.airgap-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 8px var(--neon-green);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glow);
  color: var(--neon-cyan);
  padding: 6px 14px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s var(--ease-spring);
}

.lang-toggle:hover, .lang-toggle:active {
  border-color: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
  transform: scale(1.05);
}

/* Tab Navigation */
.tab-bar {
  display: flex;
  justify-content: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-glow);
  padding: 4px 12px 0;
  gap: 6px;
  overflow-x: auto;
}

@media (max-width: 768px) {
  .tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    border-top: 1px solid var(--border-glow);
    border-bottom: none;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 1000;
    padding: 6px 4px;
    justify-content: space-around;
  }
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.25s var(--ease-spring);
  white-space: nowrap;
  border-radius: 6px 6px 0 0;
}

@media (max-width: 768px) {
  .tab-btn {
    flex-direction: column;
    font-size: 0.72rem;
    padding: 6px 8px;
    border-bottom: none;
    border-radius: 6px;
    gap: 2px;
  }
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(0, 240, 255, 0.04);
}

.tab-btn.active {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 240, 255, 0.08);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.6);
}

@media (max-width: 768px) {
  .tab-btn.active {
    border-top: 2px solid var(--neon-cyan);
  }
}

/* Main Container & Grid */
.main-content {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: slideFadeIn 0.35s var(--ease-spring);
}

@keyframes slideFadeIn {
  from { opacity: 0; transform: translateY(8px) scale(0.99); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Card Panels */
.hud-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 960px) {
  .hud-grid {
    grid-template-columns: 1fr;
  }
}

.hud-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  padding: 22px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  transition: border-color 0.3s ease;
}

.hud-card:hover {
  border-color: rgba(0, 240, 255, 0.4);
}

.hud-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 40px; height: 2px;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
}

.hud-header {
  margin-bottom: 18px;
}

.hud-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--neon-cyan);
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-subtitle {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Drag & Drop Zone */
.dropzone {
  border: 2px dashed var(--border-glow);
  background: rgba(0, 240, 255, 0.02);
  border-radius: 10px;
  padding: 28px 18px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s var(--ease-spring);
  position: relative;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--neon-cyan);
  background: rgba(0, 240, 255, 0.06);
  box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.15);
  transform: scale(1.01);
}

.dropzone input[type="file"] {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  opacity: 0;
  cursor: pointer;
}

.dropzone-icon {
  width: 42px;
  height: 42px;
  margin-bottom: 8px;
  fill: var(--neon-cyan);
  filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.4));
}

.dropzone-prompt {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.dropzone-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Custom File Selector Card in Utilities */
.custom-file-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glow);
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 12px;
  position: relative;
}

.custom-file-selector input[type="file"] {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-name-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--neon-cyan);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* File List & Items */
.file-meta-card {
  background: var(--bg-tertiary);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 14px;
  margin-top: 14px;
  display: none;
}

.file-list-container {
  max-height: 140px;
  overflow-y: auto;
  margin: 8px 0;
  padding: 4px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.file-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 8px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 4px;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.file-list-name {
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 60%;
}

.file-list-size {
  color: var(--neon-green);
}

.btn-remove-file {
  background: transparent;
  border: none;
  color: var(--neon-crimson);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.2s;
}

.btn-remove-file:hover {
  background: rgba(255, 23, 68, 0.2);
  transform: scale(1.1);
}

.file-meta-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.83rem;
  font-family: var(--font-mono);
}

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

.file-meta-label {
  color: var(--text-muted);
}

.file-meta-val {
  color: var(--neon-green);
  font-weight: 600;
  word-break: break-all;
  text-align: right;
}

/* Controls */
.control-group {
  margin: 14px 0;
}

.control-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.83rem;
  font-family: var(--font-mono);
  color: var(--text-main);
  margin-bottom: 6px;
}

.range-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--neon-cyan);
  cursor: pointer;
  box-shadow: 0 0 12px var(--neon-cyan);
  transition: transform 0.15s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.select-input, .text-input {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glow);
  color: var(--text-main);
  padding: 10px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.select-input:focus, .text-input:focus {
  border-color: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
}

.toggle-switch {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.83rem;
  font-family: var(--font-mono);
}

.toggle-switch input {
  display: none;
}

.toggle-slider {
  width: 44px;
  height: 22px;
  background: var(--bg-tertiary);
  border-radius: 11px;
  border: 1px solid var(--border-glow);
  position: relative;
  transition: all 0.25s var(--ease-spring);
}

.toggle-slider::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  left: 3px;
  top: 3px;
  background: var(--text-muted);
  transition: all 0.25s var(--ease-spring);
}

.toggle-switch input:checked + .toggle-slider {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--neon-cyan);
}

.toggle-switch input:checked + .toggle-slider::before {
  left: 25px;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
}

/* Action Buttons */
.btn-primary {
  background: linear-gradient(135deg, #00f0ff, #0099ff);
  color: #07090e;
  border: none;
  font-weight: 800;
  font-family: var(--font-mono);
  padding: 13px 20px;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  letter-spacing: 0.8px;
  transition: all 0.25s var(--ease-spring);
  box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 240, 255, 0.5);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(1px) scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.btn-secondary {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glow);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.83rem;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: 6px;
  cursor: pointer;
  flex: 1;
  transition: all 0.25s var(--ease-spring);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  transform: translateY(-1px);
}

.btn-secondary:active:not(:disabled) {
  transform: translateY(1px) scale(0.98);
}

.btn-secondary:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-danger {
  border-color: rgba(255, 23, 68, 0.4);
  color: var(--neon-crimson);
}
.btn-danger:hover:not(:disabled) {
  border-color: var(--neon-crimson);
  box-shadow: 0 0 12px rgba(255, 23, 68, 0.4);
}

/* QR Code Display Card */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  padding: 14px;
  border-radius: 12px;
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.25);
  margin-bottom: 14px;
  max-width: 400px;
  width: 100%;
  margin: 0 auto 14px;
}

#txQrCanvas {
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
}

/* Telemetry Gauges */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin: 14px 0;
}

.telemetry-box {
  background: var(--bg-tertiary);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  transition: transform 0.2s ease;
}

.telemetry-box:hover {
  transform: scale(1.02);
  border-color: rgba(0, 240, 255, 0.3);
}

.telemetry-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 2px;
}

.telemetry-val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--neon-cyan);
  font-family: var(--font-mono);
}

/* Real-Time Constellation Grid */
.constellation-wrapper {
  margin-top: 14px;
}

.constellation-canvas {
  width: 100%;
  height: 120px;
  background: #05070a;
  border: 1px solid var(--border-glow);
  border-radius: 8px;
  image-rendering: pixelated;
}

.constellation-legend {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 8px;
  font-size: 0.73rem;
  font-family: var(--font-mono);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}
.legend-dot.sys { background: var(--neon-green); }
.legend-dot.fnt { background: var(--neon-cyan); }
.legend-dot.mis { background: #21262d; }

/* Camera Viewport */
.camera-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 320px;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  margin: 0 auto 14px;
  border: 1px solid var(--border-glow);
}

#rxVideo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-hud-overlay {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.target-box {
  width: 210px;
  height: 210px;
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.4), inset 0 0 16px rgba(0, 240, 255, 0.2);
  border-radius: 14px;
  position: relative;
  animation: scan-pulse 2s infinite ease-in-out;
}

@keyframes scan-pulse {
  0%, 100% { transform: scale(1); border-color: var(--neon-cyan); }
  50% { transform: scale(1.02); border-color: var(--neon-green); }
}

.laser-scanline {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 2px;
  background: var(--neon-green);
  box-shadow: 0 0 12px var(--neon-green);
  animation: laser-sweep 2.2s infinite linear;
}

@keyframes laser-sweep {
  0% { top: 0; opacity: 0.8; }
  50% { top: 100%; opacity: 1; }
  100% { top: 0; opacity: 0.8; }
}

/* Log Terminal Viewer */
.log-terminal {
  background: #040608;
  border: 1px solid var(--border-glow);
  border-radius: 8px;
  padding: 12px;
  height: 380px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: #c9d1d9;
}

.log-line {
  margin-bottom: 3px;
  word-break: break-all;
}

.log-line.DEBUG { color: #8b949e; }
.log-line.INFO { color: var(--neon-cyan); }
.log-line.SUCCESS { color: var(--neon-green); font-weight: bold; }
.log-line.WARN { color: var(--neon-amber); }
.log-line.ERROR { color: var(--neon-crimson); font-weight: bold; }

/* Completion Banner */
.completion-banner {
  background: rgba(57, 255, 20, 0.1);
  border: 1px solid var(--neon-green);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  margin-top: 14px;
  display: none;
}

.completion-banner.active {
  display: block;
  animation: slideFadeIn 0.4s var(--ease-spring);
}

.completion-title {
  color: var(--neon-green);
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  margin-bottom: 8px;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--neon-cyan);
}