/* ==============================================================================
   PEREGRINE WEB TERMINAL // ULTRA-LOW LATENCY STYLESHEET
   Design System: Cyber-Dark, Glassmorphism, Visual Viewport & Touch Optimization
   ============================================================================== */

:root {
  --bg-core: #0a0e14;
  --bg-surface: rgba(13, 17, 23, 0.85);
  --bg-surface-opaque: #0d1117;
  --bg-pill: rgba(255, 255, 255, 0.05);
  --bg-pill-hover: rgba(255, 255, 255, 0.1);
  --bg-key: #161b22;
  --bg-key-active: #21262d;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-bright: rgba(0, 240, 255, 0.3);

  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --text-dim: #484f58;

  --cyan-glow: #00f0ff;
  --cyan-glow-dim: rgba(0, 240, 255, 0.15);
  --green-glow: #50fa7b;
  --green-glow-dim: rgba(80, 250, 123, 0.15);
  --red-glow: #ff5555;
  --red-glow-dim: rgba(255, 85, 85, 0.2);
  --amber-glow: #ffb86c;

  --font-mono: "JetBrains Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  --font-ui: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Dynamic Visual Viewport variables updated via JavaScript */
  --v-height: 100vh;
  --v-top: 0px;
  --v-bottom-offset: 0px;
  --header-height: 48px;
  --toolbar-height: 46px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-core);
  color: var(--text-main);
  font-family: var(--font-ui);
  position: fixed;
  left: 0;
  top: 0;
}

/* ==============================================================================
   APP SHELL & VIEWPORT ARCHITECTURE
   ============================================================================== */

.terminal-app-shell {
  display: flex;
  flex-direction: column;
  position: absolute;
  left: 0;
  top: var(--v-top);
  width: 100%;
  height: var(--v-height);
  overflow: hidden;
  background-color: var(--bg-core);
}

/* ==============================================================================
   HEADER HUD (Status, Latency, Controls)
   ============================================================================== */

.terminal-header {
  height: var(--header-height);
  min-height: var(--header-height);
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 100;
  gap: 12px;
}

.header-left, .header-center, .header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-glyph {
  color: var(--cyan-glow);
  display: flex;
  align-items: center;
  filter: drop-shadow(0 0 8px var(--cyan-glow-dim));
}

.brand-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: #ffffff;
}

.brand-accent {
  color: var(--cyan-glow);
}

/* Connection Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}

.status-badge.connected {
  background: var(--green-glow-dim);
  border-color: rgba(80, 250, 123, 0.4);
  color: var(--green-glow);
}

.status-badge.connected .status-indicator {
  background: var(--green-glow);
  box-shadow: 0 0 8px var(--green-glow);
  animation: pulse-glow 2s infinite ease-in-out;
}

.status-badge.connecting {
  background: rgba(255, 184, 108, 0.15);
  border-color: rgba(255, 184, 108, 0.4);
  color: var(--amber-glow);
}

.status-badge.connecting .status-indicator {
  background: var(--amber-glow);
  animation: pulse-fast 1s infinite alternate;
}

.status-badge.disconnected {
  background: var(--red-glow-dim);
  border-color: rgba(255, 85, 85, 0.4);
  color: var(--red-glow);
}

.status-badge.disconnected .status-indicator {
  background: var(--red-glow);
}

/* Latency Metric Display */
.latency-hud {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
  transition: border-color 0.2s;
}

.latency-hud:hover {
  border-color: var(--cyan-glow);
}

.metric-spark {
  color: var(--cyan-glow);
  font-size: 11px;
}

/* Center Info Pills */
.info-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 11px;
  font-family: var(--font-mono);
}

.pill-label {
  color: var(--text-dim);
  font-weight: 600;
}

.pill-val {
  color: var(--text-muted);
}

.pill-val.nodelay {
  color: var(--cyan-glow);
  font-weight: 600;
}

/* HUD Buttons */
.btn-hud {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-hud:hover {
  background: var(--bg-pill-hover);
  border-color: var(--border-bright);
  color: #ffffff;
}

.btn-hud:active {
  transform: scale(0.97);
}

.btn-hud.icon-only {
  padding: 5px 8px;
}

.btn-hud.btn-action {
  background: rgba(0, 240, 255, 0.1);
  border-color: rgba(0, 240, 255, 0.3);
  color: var(--cyan-glow);
}

.btn-hud.btn-action:hover {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--cyan-glow);
  box-shadow: 0 0 10px var(--cyan-glow-dim);
}

.font-controls {
  display: flex;
  align-items: center;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  overflow: hidden;
}

.font-controls .btn-hud {
  border: none;
  background: transparent;
  border-radius: 0;
  padding: 4px 8px;
}

.font-size-indicator {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  padding: 0 4px;
}

/* ==============================================================================
   TERMINAL VIEWPORT & CONTAINER
   ============================================================================== */

.terminal-viewport {
  flex: 1;
  position: relative;
  width: 100%;
  overflow: hidden;
  background-color: var(--bg-core);
}

.terminal-container {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  padding: 6px 8px;
}

/* xterm customization */
.terminal-container .xterm {
  padding: 0;
  height: 100%;
}

.terminal-container .xterm-viewport {
  background-color: transparent !important;
}

/* ==============================================================================
   TOUCH MODIFIER TOOLBAR (Mobile Visual Viewport Integrated)
   ============================================================================== */

.touch-toolbar {
  height: var(--toolbar-height);
  min-height: var(--toolbar-height);
  background: var(--bg-surface-opaque);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 8px;
  z-index: 90;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.touch-toolbar.hidden {
  display: none;
}

.toolbar-scroller {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  overflow-y: hidden;
  width: 100%;
  height: 100%;
  padding: 4px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.toolbar-scroller::-webkit-scrollbar {
  display: none;
}

.touch-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 36px;
  padding: 0 10px;
  background: var(--bg-key);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.touch-key:active {
  background: var(--cyan-glow);
  color: #000000;
  transform: translateY(1px);
}

.touch-key-fn {
  color: var(--cyan-glow);
  font-weight: 600;
}

.touch-key-mod {
  position: relative;
  gap: 5px;
  color: var(--text-muted);
}

.touch-key-mod.active {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--cyan-glow);
  color: #ffffff;
  box-shadow: 0 0 10px var(--cyan-glow-dim);
}

.mod-indicator {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: all 0.2s;
}

.touch-key-mod.active .mod-indicator {
  background: var(--cyan-glow);
  box-shadow: 0 0 6px var(--cyan-glow);
}

.touch-key-action {
  font-weight: 600;
}

.touch-key-danger {
  color: var(--red-glow);
}

.touch-key-danger:active {
  background: var(--red-glow);
  color: #ffffff;
}

.touch-key-arrow {
  font-size: 12px;
  min-width: 38px;
}

/* ==============================================================================
   MODAL / SETTINGS BACKDROP
   ============================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
  transition: opacity 0.2s ease;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-card {
  background: var(--bg-surface-opaque);
  border: 1px solid var(--border-bright);
  border-radius: 12px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 20px var(--cyan-glow-dim);
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 4px;
}

.btn-close:hover {
  color: #ffffff;
}

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-body label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.modal-body input {
  background: var(--bg-core);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 10px 12px;
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
  user-select: text;
}

.modal-body input:focus {
  border-color: var(--cyan-glow);
  box-shadow: 0 0 8px var(--cyan-glow-dim);
}

.modal-help {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.modal-help code {
  font-family: var(--font-mono);
  background: var(--bg-pill);
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--cyan-glow);
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.btn-primary {
  flex: 1;
  background: var(--cyan-glow);
  color: #000000;
  font-weight: 600;
  font-size: 13px;
  border: none;
  border-radius: 6px;
  padding: 10px;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-size: 13px;
  border-radius: 6px;
  padding: 10px 14px;
  cursor: pointer;
}

/* ==============================================================================
   ANIMATIONS & RESPONSIVENESS
   ============================================================================== */

@keyframes pulse-glow {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 6px var(--green-glow);
  }
  50% {
    opacity: 0.6;
    box-shadow: 0 0 2px var(--green-glow);
  }
}

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

@media (max-width: 768px) {
  .hide-mobile {
    display: none !important;
  }

  .terminal-header {
    padding: 0 10px;
  }

  .touch-key {
    min-width: 42px;
    height: 38px;
  }
}