/* ==========================================================================
   Syphr - Premium Apple / Notion Minimalist Ephemeral P2P Web Chat
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Dynamic Theming Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Default OLED Theme values */
  --bg: #000000;
  --surface: #18181b;
  --border: #27272a;
  --border-hover: #3f3f46;
  --text: #f4f4f5;
  --text-muted: #71717a;
  --accent: #38bdf8;

  /* Accent colors */
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-cyan: #38bdf8;
  --accent-crimson: #ef4444;

  /* Typography Stack */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Monaco, Consolas, monospace;

  /* Border Radii */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Motion */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg: #000000;
  --surface: #0a0a0c;
  --border: #27272a;
  --border-hover: #3f3f46;
  --text: #f4f4f5;
  --text-muted: #71717a;
  --accent: #ffffff;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #2563eb;
}

[data-theme="neon"] {
  --bg: #0b0717;
  --surface: #140d2b;
  --border: #3b1d6e;
  --border-hover: #5b21b6;
  --text: #f5f3ff;
  --text-muted: #a78bfa;
  --accent: #ec4899;
}

/* --------------------------------------------------------------------------
   2. Reset & App Shell
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.15s ease, color 0.15s ease;
}

#app-shell {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  max-height: 100dvh;
  overflow: hidden;
  position: relative;
  background: var(--bg);
  transition: background-color 0.15s ease;
}

/* --------------------------------------------------------------------------
   3. Header: Single Flex Row, No Pill Capsules, No Background Fills (Apple/Notion Minimalism)
   -------------------------------------------------------------------------- */
#app-header {
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 40;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  user-select: none;
  cursor: default;
}

.logo-glyph {
  width: 22px;
  height: 22px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}

.brand-title {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

/* Connection status: Plain text with a single 6px glowing dot */
.connection-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  border: none;
  padding: 0;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
  white-space: nowrap;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent-amber);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent-amber);
  flex-shrink: 0;
  animation: pulseBeacon 2.2s infinite ease-in-out;
}

.connection-pill.connected .pulse-dot {
  background-color: var(--accent-emerald);
  box-shadow: 0 0 6px var(--accent-emerald);
}

.connection-pill.connecting .pulse-dot {
  background-color: var(--accent-cyan);
  box-shadow: 0 0 6px var(--accent-cyan);
}

.connection-pill.disconnected .pulse-dot {
  background-color: var(--accent-crimson);
  box-shadow: 0 0 6px var(--accent-crimson);
}

@keyframes pulseBeacon {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.9); }
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Borderless Ghost Icon Action buttons */
.btn-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-xs);
  border: none;
  background: transparent;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.btn-icon:active {
  transform: scale(0.96);
}

/* Minimalist Panic button - borderless ghost control style */
.btn-panic {
  height: 32px;
  padding: 0 8px;
  border-radius: var(--radius-xs);
  background: transparent;
  border: none;
  color: #f87171;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-panic:hover {
  background: rgba(239, 68, 68, 0.08);
  color: #fca5a5;
}

.btn-panic:active {
  transform: scale(0.96);
}

/* Hide labels inside action pills for top header on all viewports if desired */
.btn-panic span.btn-label,
.btn-panic kbd {
  display: none !important;
}

/* --------------------------------------------------------------------------
   4. Sub-Bar: Clean Flat Identity & Channel Controls
   -------------------------------------------------------------------------- */
#sub-bar {
  height: 42px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 35;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.identity-cluster {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-identity-card {
  display: flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  border: none;
  padding: 0;
  font-size: 13px;
}

.avatar-ring-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.handle-inline-wrapper {
  display: flex;
  align-items: center;
  gap: 4px;
}

.user-handle-text {
  font-weight: 500;
  color: var(--text);
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inline-handle-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 2px 6px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  outline: none;
  width: 130px;
  height: 24px;
}

.btn-subtle-icon {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s ease;
  padding: 0;
  flex-shrink: 0;
}

.btn-subtle-icon:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.btn-subtle-icon.btn-save-handle:hover {
  color: var(--accent-emerald);
}

.btn-subtle-icon.btn-cancel-handle:hover {
  color: var(--accent-crimson);
}

.hidden {
  display: none !important;
}

.peer-identity-card {
  display: flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  border: none;
  padding: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.peer-identity-card.connected {
  color: var(--text);
}

.channel-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.burn-timer-group {
  display: flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  padding: 0;
}

.burn-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.burn-select {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  padding: 2px 0;
}

.burn-select:hover {
  color: var(--text);
}

.burn-select option {
  background: var(--surface);
  color: var(--text);
}

.btn-ghost-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: var(--radius-xs);
  transition: all 0.15s ease;
}

.btn-ghost-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

/* --------------------------------------------------------------------------
   5. Chat Stage & Messages
   -------------------------------------------------------------------------- */
#chat-stage {
  flex: 1 1 0%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  background: var(--bg);
  transition: background-color 0.15s ease;
}

#message-stream {
  flex: 1 1 0%;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scroll-behavior: smooth;
  max-width: 840px;
  width: 100%;
  margin: 0 auto;
}

#message-stream::-webkit-scrollbar {
  width: 4px;
}

#message-stream::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* Welcome Info Card */
.welcome-card {
  margin: 16px auto 24px auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 20px;
  max-width: 580px;
  width: 100%;
  text-align: center;
  position: relative;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.welcome-card.fade-out {
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
}

.welcome-close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s;
}

.welcome-close-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.welcome-icon-wrap {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px auto;
  color: var(--text);
}

.welcome-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 6px;
}

.welcome-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 18px;
}

.security-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 18px;
  text-align: left;
}

.highlight-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
}

.highlight-box h4 {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 3px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.highlight-box p {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.35;
}

.welcome-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn-primary {
  height: 34px;
  padding: 0 14px;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-xs);
  font-weight: 600;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-pill {
  height: 34px;
  padding: 0 12px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-xs);
  font-size: 12px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-pill:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.04);
}

/* --------------------------------------------------------------------------
   6. Message Containers (Specification Compliant Overhaul)
   - Incoming: Surface color with 1px border var(--border), 12px border radius
   - Outgoing: Pure background color with 1px border var(--border), 12px border radius
   -------------------------------------------------------------------------- */
.message-row {
  display: flex;
  gap: 10px;
  width: 100%;
  animation: messageEnter 0.22s var(--ease-spring) forwards;
  position: relative;
}

@keyframes messageEnter {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-row.sent {
  flex-direction: row-reverse;
}

.message-avatar-container {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  margin-top: 2px;
}

.message-content-wrapper {
  max-width: 72%;
  display: flex;
  flex-direction: column;
}

.message-row.sent .message-content-wrapper {
  align-items: flex-end;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 3px;
  font-size: 11px;
  color: var(--text-muted);
}

.message-meta .sender-name {
  font-weight: 500;
  color: var(--text);
}

.message-bubble {
  position: relative;
  padding: 10px 14px;
  font-size: 13.5px;
  line-height: 1.5;
  word-break: break-word;
  border-radius: 12px;
  transition: all 0.18s ease;
}

/* Outgoing messages: transparent/pure background color with 1px border */
.message-row.sent .message-bubble {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

/* Incoming messages: surface color with 1px border */
.message-row.received .message-bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}

.bubble-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  font-size: 10px;
  color: var(--text-muted);
  justify-content: flex-end;
  font-variant-numeric: tabular-nums;
}

.burn-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: #fb923c;
  font-weight: 500;
}

.burn-badge.burning-fast {
  color: #f87171;
  animation: pulseBeacon 1s infinite;
}

/* Embedded Attachments & Blocks */
.code-block-container {
  margin-top: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 10px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.code-copy-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 10.5px;
  padding: 2px 5px;
  border-radius: 3px;
  transition: all 0.15s;
}

.code-copy-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.code-content {
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.inline-code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  padding: 1px 4px;
  border-radius: 3px;
  color: var(--text);
}

.bubble-image-wrap,
.image-attachment-wrap {
  margin-top: 6px;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border);
  display: inline-block;
  max-width: 100%;
}

.bubble-image-wrap img,
.image-attachment-wrap img {
  display: block;
  max-width: 100%;
  max-height: 350px;
  width: auto;
  height: auto;
  object-fit: contain; /* maintains aspect ratio without stretching */
  border-radius: 8px;
  transition: transform 0.2s ease;
}

.bubble-image-wrap:hover img,
.image-attachment-wrap:hover img {
  transform: scale(1.01);
}

.file-attachment-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  margin-top: 6px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.15s ease;
}

.file-attachment-card:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.03);
}

.file-icon-wrap {
  width: 28px;
  height: 28px;
  background: var(--surface);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}

.file-info {
  flex: 1;
  overflow: hidden;
}

.file-name {
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: 10px;
  color: var(--text-muted);
}

/* Dissolve effects for self-destructing messages */
.burn-fizzle {
  animation: burnDissolve 0.55s cubic-bezier(0.4, 0, 0.2, 1) forwards !important;
  pointer-events: none;
}

@keyframes burnDissolve {
  0% { opacity: 1; transform: scale(1); }
  35% { opacity: 0.85; filter: brightness(2) drop-shadow(0 0 10px #ef4444); transform: scale(1.01) translateY(-1px); }
  70% { opacity: 0.35; filter: blur(4px) brightness(2.5) drop-shadow(0 0 14px #ff3366); transform: scale(0.95) translateY(-5px); }
  100% { opacity: 0; filter: blur(10px) brightness(0); transform: scale(0.7) translateY(-8px); height: 0; margin: 0; padding: 0; }
}

/* Drag overlay panel */
#drag-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px dashed var(--border-hover);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  color: #ffffff;
  gap: 12px;
  pointer-events: none;
}

#drag-overlay.active {
  display: flex;
}

.drag-icon-glow {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Typing state indicator */
#typing-indicator {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 4px 24px;
  font-size: 11px;
  color: var(--text-muted);
  background: transparent;
  max-width: 840px;
  width: 100%;
  margin: 0 auto;
}

#typing-indicator.active {
  display: flex;
}

.typing-dots {
  display: flex;
  gap: 3px;
}

.typing-dot {
  width: 4px;
  height: 4px;
  background-color: var(--text-muted);
  border-radius: 50%;
  animation: typingBounce 1.2s infinite ease-in-out;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.3; }
  30% { transform: translateY(-3px); opacity: 1; }
}

/* --------------------------------------------------------------------------
   7. Input Dock (Seamlessly bound to var(--surface) or var(--bg) with 1px border)
   -------------------------------------------------------------------------- */
#input-dock {
  position: relative;
  bottom: 0;
  width: 100%;
  flex-shrink: 0;
  padding: 10px 20px;
  padding-bottom: max(14px, env(safe-area-inset-bottom));
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-left: none;
  border-right: none;
  border-bottom: none;
  z-index: 100;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

#staged-attachment {
  display: none;
  align-items: center;
  gap: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  margin: 0 auto 8px auto;
  max-width: 840px;
  width: fit-content;
}

#staged-attachment.active {
  display: flex;
}

.staged-thumb {
  width: 26px;
  height: 26px;
  border-radius: 3px;
  object-fit: cover;
  background: #000;
}

.staged-info {
  font-size: 11.5px;
  color: var(--text);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.staged-remove-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.staged-remove-btn:hover {
  color: var(--accent-crimson);
}

.input-container {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 2px 0;
  max-width: 840px;
  margin: 0 auto;
}

.input-container:focus-within {
  border: none;
  box-shadow: none;
}

.input-action-btn {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
  margin-bottom: 2px;
}

.input-action-btn:hover {
  color: var(--text);
  background: var(--border);
}

#message-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  resize: none !important;
  max-height: 140px;
  min-height: 24px;
  padding: 6px 4px;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none;  /* IE and Edge */
}

#message-input::placeholder {
  color: var(--text-muted);
  opacity: 0.85;
}

#message-input::-webkit-scrollbar {
  display: none !important; /* Safari/Chrome */
  width: 0 !important;
  height: 0 !important;
}

/* Floating Attachment Menu Style */
.attachment-menu {
  position: absolute;
  bottom: 56px;
  left: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  padding: 4px;
  z-index: 200;
  min-width: 195px;
  animation: popIn 0.15s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes popIn {
  from { opacity: 0; transform: translateY(8px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.attachment-menu.hidden {
  display: none !important;
}

.attachment-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: none;
  color: var(--text);
  padding: 8px 12px;
  font-size: 12.5px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: all 0.12s ease;
}

.attachment-menu-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #ffffff;
}

.attachment-menu-item i {
  flex-shrink: 0;
}

/* Push-to-Talk Recording & Voice Note Playback Styles */
#btn-mic.recording {
  color: var(--accent-crimson) !important;
  animation: micPulse 1.2s infinite ease-in-out;
  background: rgba(239, 68, 68, 0.15) !important;
}

@keyframes micPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.12); }
}

.voice-note-player {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 4px;
  min-width: 230px;
  max-width: 320px;
}

.voice-play-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.12s ease;
}

.voice-play-btn:hover {
  transform: scale(1.05);
}

.voice-timeline-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.voice-waveform-dummy {
  height: 14px;
  display: flex;
  align-items: center;
  gap: 2px;
}

.waveform-bar {
  flex: 1;
  height: 50%;
  background: var(--border);
  border-radius: 1px;
  transition: height 0.15s ease, background-color 0.15s ease;
}

.waveform-bar.active {
  background: var(--accent-cyan);
}

.voice-duration {
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* View-Once Image Styles */
.view-once-unopened {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--border-hover);
  border-radius: 8px;
  padding: 24px 16px;
  cursor: pointer;
  transition: all 0.15s ease;
  min-width: 220px;
  text-align: center;
}

.view-once-unopened:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--text-muted);
}

.view-once-expired {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12.5px;
  padding: 12px 16px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.01);
  border-radius: 8px;
  text-decoration: none;
  pointer-events: none;
  user-select: none;
}

.view-once-timer-bar {
  height: 2px;
  width: 100%;
  background: var(--accent-amber);
  margin-top: 4px;
  border-radius: 1px;
  transform-origin: left;
  animation: shrinkBar 5s linear forwards;
}

@keyframes shrinkBar {
  from { transform: scaleX(1); }
  to { transform: scaleX(0); }
}

/* Advanced Markdown Blockquote styles */
.parsed-blockquote {
  border-left: 3px solid var(--border-hover);
  padding-left: 10px;
  margin: 6px 0;
  color: var(--text-muted);
  font-style: italic;
}

#message-input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.send-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--text);
  border: none;
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s var(--ease-spring);
  flex-shrink: 0;
  margin-bottom: 3px;
}

.send-btn:hover {
  opacity: 0.9;
  transform: scale(1.04);
}

.send-btn:active {
  transform: scale(0.96);
}

/* --------------------------------------------------------------------------
   8. Modals & Settings Dialog (Bound to var(--surface) & var(--border))
   -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
  animation: fadeIn 0.18s ease;
}

.modal-backdrop.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
  position: relative;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-xs);
  transition: all 0.15s ease;
}

.modal-close-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

/* QR Modal Layout */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.qr-box {
  background: #ffffff;
  padding: 12px;
  border-radius: 8px;
  display: inline-block;
}

.qr-box canvas, .qr-box img {
  display: block;
}

.qr-url-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  word-break: break-all;
  max-width: 100%;
}

/* Settings fields & alignments */
.settings-card {
  max-width: 420px;
  width: 100%;
}

.settings-modal-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.settings-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
}

.settings-subtext {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

.settings-handle-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-preview-avatar {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

#settings-handle-input {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s ease;
}

#settings-handle-input:focus {
  border-color: var(--border-hover);
}

.avatar-emoji-picker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  background: var(--bg);
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.emoji-select-btn {
  height: 34px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.emoji-select-btn:hover {
  background: rgba(255, 255, 255, 0.06);
}

.emoji-select-btn.active {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 1px var(--accent) !important;
}

.theme-toggle-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.theme-option-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 8px 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.theme-option-btn:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

.theme-option-btn.active {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--accent) !important;
  color: var(--text);
  box-shadow: 0 0 0 1px var(--accent);
}

.theme-preview-swatch {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1.5px solid transparent;
}

.swatch-dark {
  background: #000000;
  border-color: #27272a;
}

.swatch-light {
  background: #f8fafc;
  border-color: #e2e8f0;
}

.swatch-neon {
  background: #0b0717;
  border-color: #3b1d6e;
}

/* Privacy & Stealth Controls style */
.privacy-control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-top: 4px;
}

.privacy-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  padding-right: 12px;
}

.privacy-title {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
}

/* Elegant iOS-style minimalist toggle switch */
.switch-toggle {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.switch-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--border);
  border-radius: 22px;
  transition: background-color 0.2s ease;
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text);
  border-radius: 50%;
  transition: transform 0.2s ease;
}

.switch-toggle input:checked + .switch-slider {
  background-color: var(--accent);
}

.switch-toggle input:checked + .switch-slider::before {
  transform: translateX(18px);
}

/* Stealth Blur Overlay style */
#stealth-blur-overlay {
  position: absolute;
  inset: 0;
  background: var(--bg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 250; /* Spans the entire message feed and sits above all chat bubbles */
  display: flex;
  align-items: center;
  justify-content: center;
}

#stealth-blur-overlay.active {
  background: var(--bg);
  opacity: 0.95; /* Opaque fallback background to completely mask the text */
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  pointer-events: auto;
}

/* Lightbox Modal */
#lightbox-modal .modal-card {
  max-width: 90vw;
  max-height: 90vh;
  padding: 10px;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
}

#lightbox-img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 6px;
}

/* Toasts Container */
#toast-container {
  position: fixed;
  bottom: 74px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 150;
  pointer-events: none;
}

.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 7px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.6);
  animation: toastIn 0.2s var(--ease-spring);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Panic Screen Wipe Overlay */
#nuke-flash {
  position: fixed;
  inset: 0;
  background: #ef4444;
  z-index: 999999;
  display: none;
  animation: nukeExplode 0.4s forwards;
}

@keyframes nukeExplode {
  0% { opacity: 0; }
  20% { opacity: 1; }
  100% { opacity: 0; background: #000000; }
}

/* --------------------------------------------------------------------------
   9. Mobile Responsive Adaptations & Flawless Layout (max-width: 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  #app-header {
    height: 46px;
    padding: 0 12px;
    gap: 8px;
  }

  .header-left {
    gap: 8px;
    flex: 1;
    min-width: 0;
  }

  .brand-title {
    font-size: 13.5px;
  }

  .connection-pill {
    font-size: 11.5px;
    gap: 5px;
    max-width: 100%;
  }

  .connection-pill span#connection-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 110px;
  }

  .header-right {
    gap: 4px;
    flex-shrink: 0;
  }

  .btn-icon {
    width: 30px;
    height: 30px;
  }

  .btn-panic {
    height: 30px;
    padding: 0 7px;
  }

  #sub-bar {
    height: auto;
    padding: 6px 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .identity-cluster {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .user-identity-card,
  .peer-identity-card {
    flex: 1;
    min-width: 0;
    justify-content: flex-start;
  }

  .user-handle-text {
    max-width: 90px;
    font-size: 12px;
  }

  .channel-controls {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .burn-timer-group {
    flex: 1;
    min-width: 0;
  }

  .burn-label {
    font-size: 11px;
  }

  .burn-select {
    font-size: 11px;
    width: 100%;
  }

  #chat-stage {
    flex: 1 1 0%;
    min-height: 0;
    overflow: hidden;
    padding-bottom: calc(56px + env(safe-area-inset-bottom));
  }

  #message-stream {
    flex: 1 1 0%;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 10px 12px 14px 12px;
    gap: 10px;
  }

  .message-content-wrapper {
    max-width: 86%;
  }

  /* Fixed Mobile Text Input: Seamlessly anchored at bottom with 1px top border */
  #input-dock {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 100;
    flex-shrink: 0;
    padding: 6px 12px;
    padding-bottom: max(10px, env(safe-area-inset-bottom));
    background: #000000;
    border-top: 1px solid #27272a;
    border-left: none;
    border-right: none;
    border-bottom: none;
    box-shadow: none;
  }

  .input-container {
    gap: 6px;
    padding: 2px 0;
    min-height: 36px;
    background: #000000;
    border: none;
    border-radius: 0;
  }

  #message-input {
    font-size: 16px; /* Prevents auto-zoom on iOS */
    padding: 4px 2px;
    min-height: 30px;
    max-height: 90px;
  }

  .input-action-btn {
    width: 30px;
    height: 30px;
  }

  .send-btn {
    width: 30px;
    height: 30px;
  }

  .settings-card {
    max-width: 95vw;
    padding: 16px 12px;
    max-height: 90vh;
    overflow-y: auto;
  }

  .avatar-emoji-picker {
    grid-template-columns: repeat(6, 1fr);
    gap: 4px;
    padding: 5px;
  }

  .emoji-select-btn {
    height: 32px;
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  #app-header {
    padding: 0 8px;
    gap: 4px;
  }

  .header-right {
    gap: 3px;
  }

  .connection-pill span#connection-text {
    max-width: 70px;
  }
}