:root {
  --app-background: #0b172a;
  --surface-background: rgba(15, 23, 42, 0.86);
  --surface-muted: rgba(15, 23, 42, 0.76);
  --surface-strong: rgba(15, 23, 42, 0.7);
  --surface-tile: #111b2b;
  --overlay-strong: rgba(15, 23, 42, 0.92);
  --input-background: rgba(15, 23, 42, 0.6);
  --input-border: rgba(148, 163, 184, 0.45);
  --border-subtle: rgba(148, 163, 184, 0.2);
  --text-primary: #f8fafc;
  --text-secondary: #9aa5b1;
  --text-muted: #94a3b8;
  --accent-start: #4f46e5;
  --accent-end: #3b82f6;
  --accent-contrast: #f8fafc;
  --secondary-button-bg: rgba(15, 23, 42, 0.65);
  --secondary-button-text: #f8fafc;
  --danger-bg: rgba(239, 68, 68, 0.9);
  --badge-bg: rgba(59, 130, 246, 0.15);
  --badge-text: #93c5fd;
  --icon-button-bg: rgba(59, 130, 246, 0.25);
  --icon-button-border: rgba(59, 130, 246, 0.35);
  --chat-bubble-bg: rgba(30, 46, 76, 0.8);
  --input-contrast: rgba(19, 31, 53, 0.8);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body.theme-dark {
  --app-background: #0b172a;
  --surface-background: rgba(15, 23, 42, 0.86);
  --surface-muted: rgba(15, 23, 42, 0.76);
  --surface-strong: rgba(15, 23, 42, 0.7);
  --surface-tile: #111b2b;
  --overlay-strong: rgba(15, 23, 42, 0.92);
  --input-background: rgba(15, 23, 42, 0.6);
  --input-border: rgba(148, 163, 184, 0.45);
  --border-subtle: rgba(148, 163, 184, 0.2);
  --text-primary: #f8fafc;
  --text-secondary: #9aa5b1;
  --text-muted: #94a3b8;
  --secondary-button-bg: rgba(15, 23, 42, 0.65);
  --secondary-button-text: #f8fafc;
  --badge-bg: rgba(59, 130, 246, 0.15);
  --badge-text: #93c5fd;
  --icon-button-bg: rgba(59, 130, 246, 0.25);
  --icon-button-border: rgba(59, 130, 246, 0.35);
  --chat-bubble-bg: rgba(30, 46, 76, 0.8);
  --input-contrast: rgba(19, 31, 53, 0.8);
  --success-bg: rgba(34, 197, 94, 0.12);
  --success-border: rgba(74, 222, 128, 0.35);
  --success-text: #bbf7d0;
  --error-bg: rgba(239, 68, 68, 0.15);
  --error-border: rgba(248, 113, 113, 0.35);
  --error-text: #fecaca;
  --success-bg: rgba(34, 197, 94, 0.12);
  --success-border: rgba(74, 222, 128, 0.35);
  --success-text: #bbf7d0;
  --error-bg: rgba(239, 68, 68, 0.15);
  --error-border: rgba(248, 113, 113, 0.35);
  --error-text: #fecaca;
}

body.theme-light {
  --app-background: #edf2ff;
  --surface-background: rgba(255, 255, 255, 0.95);
  --surface-muted: rgba(248, 250, 255, 0.95);
  --surface-strong: rgba(233, 236, 248, 0.85);
  --surface-tile: #ffffff;
  --overlay-strong: rgba(255, 255, 255, 0.98);
  --input-background: rgba(255, 255, 255, 0.9);
  --input-border: rgba(15, 23, 42, 0.18);
  --border-subtle: rgba(15, 23, 42, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --secondary-button-bg: rgba(15, 23, 42, 0.08);
  --secondary-button-text: #0f172a;
  --badge-bg: rgba(59, 130, 246, 0.25);
  --badge-text: #1d4ed8;
  --icon-button-bg: rgba(59, 130, 246, 0.2);
  --icon-button-border: rgba(59, 130, 246, 0.45);
  --chat-bubble-bg: rgba(255, 255, 255, 0.9);
  --input-contrast: rgba(244, 247, 255, 0.95);
  --success-bg: #d1fae5;
  --success-border: #86efac;
  --success-text: #166534;
  --error-bg: #fee2e2;
  --error-border: #fecaca;
  --error-text: #b91c1c;
  --preflight-on-icon: #ffffff;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--app-background);
  color: var(--text-primary);
  transition: background 0.25s ease, color 0.25s ease;
}

body.device-settings-open {
  overflow: hidden;
}

button {
  cursor: pointer;
  border: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

#app {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: stretch;
}

.landing {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  min-width: 320px;
  padding: 3rem 1.5rem;
  text-align: center;
}

.landing .user-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  width: min(900px, 96vw);
  text-align: left;
}

.landing .user-bar h1 {
  font-size: 2.2rem;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-primary);
  justify-content: flex-end;
  flex-wrap: wrap;
}

.user-profile .user-details {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
  text-align: right;
}

.user-profile .user-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.user-profile .user-handle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.profile-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.landing.account .user-profile {
  align-items: flex-start;
  justify-content: flex-start;
}

.landing.account .user-profile .user-details,
.landing.preferences .user-profile .user-details {
  align-items: flex-start;
  text-align: left;
}

.landing.preferences .user-profile {
  align-items: flex-start;
  justify-content: flex-start;
}

.landing.account .profile-actions,
.landing.preferences .profile-actions {
  justify-content: flex-start;
}

.avatar {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  overflow: hidden;
  background: var(--surface-strong);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  font-weight: 700;
  text-transform: uppercase;
}

.avatar[data-has-image="false"] {
  background: rgba(37, 99, 235, 0.25);
  color: #bfdbfe;
  border-color: rgba(96, 165, 250, 0.45);
}

.avatar span {
  font-size: 1em;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar--lg {
  width: 64px;
  height: 64px;
  font-size: 1.2rem;
}

.avatar--xl {
  width: 96px;
  height: 96px;
  font-size: 1.5rem;
}

.avatar-editor {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.avatar-preview {
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

.avatar-editor-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.avatar-hint {
  margin: 0;
  font-size: 0.78rem;
  color: #64748b;
  text-align: center;
}

button.text-button {
  background: transparent;
  color: #60a5fa;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
}

button.text-button:hover {
  color: #93c5fd;
  background: rgba(37, 99, 235, 0.15);
}

button.text-button[hidden] {
  display: none;
}

button.secondary {
  background: var(--secondary-button-bg);
  color: var(--secondary-button-text);
  border-radius: 10px;
  padding: 0.65rem 1.1rem;
}

button.secondary:hover {
  background: rgba(30, 64, 175, 0.7);
}

.landing h1 {
  margin: 0;
  font-size: 2.4rem;
  color: var(--text-primary);
}

.landing p {
  color: var(--text-secondary);
  margin: 0;
}

.landing .actions {
  display: grid;
  gap: 1rem;
  width: min(380px, 90vw);
}

.landing.auth {
  align-items: stretch;
}

.landing.auth .actions {
  width: min(760px, 92vw);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.landing.auth .card {
  text-align: left;
}

.card {
  background: var(--surface-background);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 16px 32px -18px rgba(15, 23, 42, 0.75);
  border: 1px solid var(--border-subtle);
}

.card h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card label {
  display: block;
  text-align: left;
  margin-bottom: 0.35rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card input {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: var(--input-background);
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 1rem;
  box-sizing: border-box;
}

.preflight-controls {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.device-selectors,
.device-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  align-items: flex-end;
  margin-bottom: 1.1rem;
}

.device-controls {
  justify-content: flex-start;
  margin-bottom: 0.5rem;
}

.device-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 190px;
  text-align: left;
}

.device-field label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.device-field select {
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: var(--input-background);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.device-selectors button,
.device-controls button {
  align-self: center;
}

.preflight-toggle {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
  cursor: pointer;
  color: var(--text-primary);
  font-weight: 600;
}

.preflight-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.preflight-icon {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-strong);
  border: 1px solid var(--input-border);
  color: var(--text-secondary);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.preflight-icon svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.preflight-icon .icon-on,
.preflight-icon .icon-off {
  display: none;
}

.preflight-icon .icon-on {
  display: block;
}

.preflight-icon .icon-off {
  color: var(--error-text);
}

.preflight-toggle:hover .preflight-icon {
  border-color: rgba(148, 163, 184, 0.7);
  color: var(--text-primary);
}

.preflight-toggle:hover input:not(:checked) + .preflight-icon {
  color: #fecaca;
  border-color: rgba(248, 113, 113, 0.7);
}

.preflight-toggle input:focus-visible + .preflight-icon {
  outline: 3px solid rgba(59, 130, 246, 0.55);
  outline-offset: 4px;
}

.preflight-toggle input:checked + .preflight-icon {
  background: linear-gradient(135deg, #38bdf8, #4f46e5);
  border-color: transparent;
  color: var(--preflight-on-icon, #0b172a);
  transform: translateY(-2px);
}

.preflight-toggle input:not(:checked) + .preflight-icon {
  color: var(--error-text);
  border-color: var(--error-border);
}

.preflight-toggle input:not(:checked) + .preflight-icon .icon-on {
  display: none;
}

.preflight-toggle input:not(:checked) + .preflight-icon .icon-off {
  display: block;
  color: var(--error-text);
}

.preflight-text {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.card button {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--accent-contrast);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-subtitle {
  margin: -0.4rem 0 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.appearance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.appearance-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.appearance-field--full {
  grid-column: 1 / -1;
}

.appearance-field input[type="color"] {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: var(--input-background);
  color: var(--text-primary);
  min-height: 44px;
  padding: 0.3rem;
  cursor: pointer;
}

.appearance-field select {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: var(--input-background);
  color: var(--text-primary);
  min-height: 44px;
  padding: 0.3rem;
}

.appearance-hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.appearance-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 1rem;
}

.card button:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -15px rgba(59, 130, 246, 0.75);
}

.card .error {
  margin: 0 0 0.75rem;
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: #fecaca;
  text-align: left;
}

.form-message {
  margin: 0 0 0.75rem;
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  font-size: 0.92rem;
  text-align: left;
}

.form-message.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
}

.form-message.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.main-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1.5rem;
  padding: 1.5rem;
  width: 100%;
  max-width: 1400px;
  color: var(--text-primary);
}

.video-stage {
  background: var(--surface-muted);
  border-radius: 16px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.1);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.video-container {
  position: relative;
  background: var(--surface-tile);
  border-radius: 12px;
  overflow: hidden;
  min-height: 180px;
}

.video-container video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #0f172a;
  transition: opacity 0.2s ease;
}

.video-container .name-tag {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  background: var(--overlay-strong);
  font-size: 0.85rem;
  z-index: 3;
}

.video-container .avatar-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--overlay-strong);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 2;
}

.video-container[data-has-video="false"] .avatar-overlay {
  opacity: 1;
}

.video-container[data-has-video="true"] .avatar-overlay {
  opacity: 0;
}

.video-container[data-has-video="false"] video {
  opacity: 0;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.controls button {
  padding: 0.75rem 1.2rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--accent-contrast);
  font-weight: 600;
}

.controls button.danger {
  background: var(--danger-bg);
}

.controls button.secondary {
  background: var(--secondary-button-bg);
}

.chat-panel {
  background: var(--surface-background);
  border-radius: 16px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  box-shadow: inset 0 0 0 1px var(--border-subtle);
  max-height: calc(100vh - 3rem);
  overflow: hidden;
}

.chat-panel h2 {
  margin: 0 0 0.5rem;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.5rem 0.25rem;
  max-height: 100%;
}

.chat-message {
  background: var(--chat-bubble-bg);
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chat-message .meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.chat-message .content {
  font-size: 0.95rem;
  line-height: 1.4;
}

.chat-input {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.chat-input input {
  flex: 1;
  padding: 0.65rem 0.8rem;
  border-radius: 12px;
  border: 1px solid var(--input-border);
  background: var(--input-contrast);
  color: var(--text-primary);
  box-sizing: border-box;
}

.chat-input button {
  padding: 0.65rem 1.1rem;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--accent-contrast);
  font-weight: 700;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.8rem;
}

.badge__label {
  display: inline-block;
}

.badge .icon-button {
  margin-left: 0.2rem;
}

.icon-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--icon-button-bg);
  border: 1px solid var(--icon-button-border);
  color: var(--badge-text);
  padding: 0;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.icon-button svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.icon-button:hover {
  background: rgba(59, 130, 246, 0.35);
  border-color: rgba(147, 197, 253, 0.6);
}

.icon-button:focus-visible {
  outline: 2px solid rgba(96, 165, 250, 0.9);
  outline-offset: 2px;
}

.icon-button[data-feedback="success"] {
  background: rgba(34, 197, 94, 0.25);
  border-color: rgba(74, 222, 128, 0.6);
  color: #bbf7d0;
}

.icon-button[data-feedback="error"] {
  background: rgba(239, 68, 68, 0.25);
  border-color: rgba(248, 113, 113, 0.65);
  color: #fecaca;
}

.icon-button::after {
  content: attr(data-feedback-text);
  position: absolute;
  top: 115%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--overlay-strong);
  color: var(--text-primary);
  font-size: 0.7rem;
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 10;
}

.icon-button[data-feedback="success"]::after,
.icon-button[data-feedback="error"]::after {
  opacity: 1;
}

.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.status-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.status-meta__label {
  font-size: 0.9rem;
}

.device-settings-trigger.secondary {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--accent-contrast);
  border: none;
}

button.device-settings-trigger {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.9rem;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--accent-contrast);
  border: none;
  box-shadow: 0 12px 24px -16px rgba(0, 0, 0, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button.device-settings-trigger:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px -18px rgba(0, 0, 0, 0.45);
}

.device-settings-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 3.5rem 1.25rem 2rem;
  background: rgba(8, 15, 28, 0.78);
  backdrop-filter: blur(6px);
  z-index: 1500;
}

.device-settings-overlay.is-open {
  display: flex;
}

.device-settings-sheet {
  width: min(420px, 92vw);
  background: var(--overlay-strong);
  border-radius: 18px;
  border: 1px solid var(--border-subtle);
  box-shadow: 0 28px 60px -30px rgba(15, 23, 42, 0.9);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.6rem;
}

.device-settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.device-settings-header h2 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.device-settings-close {
  padding: 0.45rem 0.9rem;
}

.device-settings-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.device-settings-body .device-field {
  width: 100%;
}

.device-settings-refresh {
  align-self: flex-start;
}

@media (max-width: 640px) {
  .device-selectors,
  .device-controls {
    justify-content: center;
    align-items: stretch;
  }

  .device-field {
    min-width: min(100%, 240px);
  }

  .status-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .status-meta {
    width: 100%;
    justify-content: space-between;
  }

  .device-settings-overlay {
    align-items: flex-end;
    padding: 2.5rem 1rem 1.5rem;
  }

  .device-settings-sheet {
    width: 100%;
    border-radius: 18px 18px 0 0;
  }
}

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

  .chat-panel {
    max-height: 320px;
  }
}