/* =============================================================================
   LIVEKIT LOBBY - MODERN MINIMAL DESIGN
   ============================================================================= */

:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-elevated: #1f1f23;
    --bg-hover: #27272a;

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.15);

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-secondary: #8b5cf6;

    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    --sidebar-width: 240px;
    --topbar-height: 64px;
    --statusbar-height: 40px;
}

/* Keep left navigation permanently hidden */
.sidebar,
.sidebar-overlay,
#toggle-sidebar {
    display: none !important;
}

.main-content {
    margin-left: 0 !important;
}

.status-bar {
    left: 0 !important;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow: hidden;
}

/* =============================================================================
   LAYOUT
   ============================================================================= */

.app {
    display: flex;
    min-height: 100vh;
    max-height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

/* Sidebar overlay - hidden on desktop */
.sidebar-overlay {
    display: none;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.logo-text {
    font-weight: 700;
    font-size: 1.125rem;
}

.version-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-md);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    margin-bottom: var(--space-xs);
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
}

.sidebar-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--border-subtle);
}

.connection-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.indicator-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--danger);
}

.connection-indicator.connected .indicator-dot {
    background: var(--success);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-bottom: var(--statusbar-height);
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed + .main-content {
    margin-left: 0;
}

.top-bar {
    height: var(--topbar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    position: sticky;
    top: 0;
    z-index: 50;
}

.top-bar-left,
.top-bar-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.page-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.content-area {
    flex: 1;
    padding: var(--space-xl);
    padding-top: var(--space-2xl);
    overflow-y: auto;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

/* Lobby fills width and can shrink for nested video scroll on small screens */
.content-area:has(.lobby-section:not(.hidden)) {
    align-items: stretch;
    align-self: stretch;
}

/* =============================================================================
   BUTTONS
   ============================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
}

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.125rem;
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.back-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-sm) 0;
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.back-btn:hover {
    color: var(--text-primary);
}

/* =============================================================================
   AUTH SECTION
   ============================================================================= */

.auth-section {
    width: 100%;
    max-width: 420px;
    margin-top: var(--space-xl);
}

.auth-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.auth-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.auth-header p {
    color: var(--text-muted);
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: var(--space-lg) 0;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border-subtle);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.form-group input,
.select-input {
    width: 100%;
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.select-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.select-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2371717a'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-top: var(--space-md);
}

.loading-state {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
}

.user-info-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    min-width: 0;
    overflow: hidden;
}

.info-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.info-value {
    font-weight: 500;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* =============================================================================
   LOBBY SECTION
   ============================================================================= */

.lobby-section {
    width: 100%;
    min-height: 0;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.lobby-desktop-only {
    display: none;
}

@media (min-width: 641px) {
    .lobby-desktop-only {
        display: block;
    }
}

/* Room summary + stats + join/leave — always outside the participants list drawer */
.lobby-room-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-width: 0;
    grid-column: 1;
    grid-row: 1;
}

.lobby-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    grid-template-rows: auto 1fr;
    gap: var(--space-lg);
    align-items: stretch;
    width: 100%;
    min-height: 0;
    flex: 1;
    height: calc(100vh - var(--topbar-height) - var(--statusbar-height) - var(--space-xl) * 2);
}

.participants-panel {
    grid-column: 1;
    grid-row: 2;
    min-height: 0;
}

/* When video section is hidden, stack room card + list (desktop) */
.lobby-layout:has(.video-area.hidden) {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    height: auto;
    min-height: min(70vh, calc(100vh - var(--topbar-height) - var(--statusbar-height) - var(--space-xl) * 2));
}

.lobby-layout:has(.video-area.hidden) .lobby-room-card {
    grid-column: 1;
    grid-row: 1;
}

.lobby-layout:has(.video-area.hidden) .participants-panel {
    grid-column: 1;
    grid-row: 2;
}

.lobby-layout:has(.video-area.hidden) .video-area {
    display: none !important;
}

@media (min-width: 641px) {
    .lobby-layout:has(.video-area.hidden) .participants-panel {
        max-width: 600px;
        margin: 0 auto;
        width: 100%;
    }
}

.participants-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.participants-drawer-head {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
}

.participants-drawer-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.participants-list-heading {
    margin: 0;
    padding: var(--space-sm) var(--space-lg) 0;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    justify-content: flex-start;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
}

.panel-header h3 {
    flex: 1;
    min-width: 0;
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.btn-icon-sm {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon-sm:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon-sm svg {
    flex-shrink: 0;
}

.room-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--bg-tertiary);
}

.stat-item {
    text-align: center;
    padding: var(--space-sm);
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.panel-actions {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-subtle);
}

.panel-actions .btn {
    flex: 1;
}

.participants-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: var(--space-xl);
}

.participant-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xs);
    background: var(--bg-tertiary);
    transition: background var(--transition-fast);
    border-left: 3px solid transparent;
}

.participant-item.in-call {
    border-left-color: var(--success);
}

.participant-item.in-lobby {
    border-left-color: var(--accent-primary);
}

.participant-item.disconnected {
    border-left-color: var(--text-muted);
    opacity: 0.6;
}

.participant-item.current-user {
    background: rgba(99, 102, 241, 0.1);
}

.participant-item:hover {
    background: var(--bg-hover);
}

.participant-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.participant-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.participant-name-device {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.participant-name-device strong {
    font-weight: 500;
    font-size: 0.8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

.participant-name-device small {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.participant-name {
    font-weight: 500;
    font-size: 0.8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.participant-status {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
}

.participant-status .status-icon {
    font-size: 0.7rem;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.participant-status .status-icon svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
}

.participant-status .status-icon.status-active {
    opacity: 1;
    color: var(--success);
}

.participant-status .status-icon.status-inactive {
    opacity: 0.3;
}

.participant-status .kick-btn {
    padding: 2px 6px;
    font-size: 0.65rem;
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: var(--radius-sm);
    cursor: pointer;
    margin-left: auto;
}

.participant-status .kick-btn:hover {
    background: var(--danger);
    color: white;
}

.participant-actions {
    display: flex;
    gap: var(--space-xs);
}

/* Video Area */
.video-area {
    grid-column: 2;
    grid-row: 1 / span 2;
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.video-area.hidden {
    display: none;
}

.video-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    flex-wrap: wrap;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 10;
}

.video-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    min-width: 0;
    flex: 1 1 auto;
}

.video-header-right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 0;
    flex: 0 1 auto;
}

.video-header h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#toggle-screen-share-lobby-btn {
    max-width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.badge {
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.badge.online {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

.video-grid {
    flex: 1;
    min-height: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    grid-auto-rows: max-content;
    gap: var(--space-md);
    padding: var(--space-md);
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    align-content: start;
    /* Avoid stretching all tiles to the tallest row (black bands under shorter videos) */
    align-items: start;
}

/* Video Container - both classes used */
.video-container,
.remote-video-container {
    position: relative;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid var(--border-subtle);
    transition: all var(--transition-fast);
    width: 100% !important;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.video-container:hover,
.remote-video-container:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.video-container.local,
.remote-video-container.local {
    border-color: var(--accent-primary);
}

/* Video element */
.video-container video,
.remote-video-container video {
    width: 100% !important;
    height: auto !important;
    min-height: 160px;
    max-height: 280px;
    aspect-ratio: 16 / 9;
    object-fit: cover !important;
    background: #000;
    display: block;
}

/* Video Info Bar — wrap instead of horizontal scroll so tiles stay same width */
.video-info-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    gap: var(--space-xs) var(--space-sm);
    flex-wrap: wrap;
    row-gap: 6px;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: visible;
}

.video-label,
.video-label-text {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1 1 auto;
    min-width: 0;
    max-width: min(160px, 45%);
}

/* Status Indicators */
.status-indicators,
.video-status-indicators {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    flex: 1 1 auto;
    min-width: 0;
}

.status-indicator {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
}

.status-indicator svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
}

.status-indicator.status-active {
    background: rgba(34, 197, 94, 0.2);
    border-color: rgba(34, 197, 94, 0.5);
}

.status-indicator.status-inactive {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.3);
    opacity: 0.6;
}

.status-indicator.status-clickable {
    cursor: pointer;
}

.status-indicator.status-clickable:hover {
    transform: scale(1.1);
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Action Buttons */
.action-btn {
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.action-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.action-btn.kick-btn:hover,
.status-indicator.kick-btn:hover {
    background: var(--danger);
    border-color: var(--danger);
}

.status-indicator.kick-btn {
    color: var(--danger);
}

/* =============================================================================
   SETTINGS PANEL
   ============================================================================= */

.settings-panel {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 360px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-subtle);
    z-index: 200;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
}

.settings-panel:not(.hidden) {
    transform: translateX(0);
}

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

.settings-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.settings-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
}

.settings-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.settings-section-header h4 {
    font-size: 1rem;
    font-weight: 600;
}

.toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

.toggle-slider::before {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

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

.toggle input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.quality-tier {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.quality-tier[data-tier="low"] {
    border-left: 3px solid var(--info);
}
.quality-tier[data-tier="medium"] {
    border-left: 3px solid var(--accent-secondary);
}
.quality-tier[data-tier="high"] {
    border-left: 3px solid var(--success);
}

.tier-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-weight: 500;
}

.tier-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.control-row {
    display: grid;
    grid-template-columns: 50px 1fr 50px;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8125rem;
}

.control-row label {
    color: var(--text-muted);
}

.control-row input[type="range"] {
    width: 100%;
    height: 4px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    appearance: none;
    cursor: pointer;
}

.control-row input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
}

.control-value {
    text-align: right;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

/* =============================================================================
   STATUS BAR
   ============================================================================= */

.status-bar {
    height: var(--statusbar-height);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    padding: 0 var(--space-lg);
    font-size: 0.75rem;
    position: fixed;
    bottom: 0;
    left: var(--sidebar-width);
    right: 0;
    z-index: 40;
    transition: left var(--transition-normal);
}

.sidebar.collapsed ~ .status-bar {
    left: 0;
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

.status-value {
    color: var(--text-secondary);
    font-weight: 500;
}

/* =============================================================================
   MODALS & TOASTS
   ============================================================================= */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    min-width: 360px;
    max-width: 90vw;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-container {
    transform: scale(1);
}

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    position: relative;
}

.modal-header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-primary);
}

.modal-header.modal-danger::before {
    background: var(--danger);
}
.modal-header.modal-success::before {
    background: var(--success);
}

.modal-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
    background: rgba(99, 102, 241, 0.15);
}

.modal-header.modal-danger .modal-icon {
    background: rgba(239, 68, 68, 0.15);
}
.modal-header.modal-success .modal-icon {
    background: rgba(34, 197, 94, 0.15);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.modal-body {
    padding: var(--space-lg);
}

.modal-message {
    color: var(--text-secondary);
    margin: 0;
}

.modal-input {
    width: 100%;
    padding: var(--space-md);
    margin-top: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.modal-textarea {
    min-height: 100px;
    resize: vertical;
}

.modal-footer {
    padding: var(--space-md) var(--space-lg) var(--space-lg);
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
}

.modal-btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
}

.modal-btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.modal-btn-secondary:hover {
    background: var(--bg-hover);
}

.modal-btn-primary {
    background: var(--accent-primary);
    color: white;
}

.modal-btn-primary:hover {
    background: var(--accent-primary-hover);
}

.modal-btn-danger {
    background: var(--danger);
    color: white;
}

.toast-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 10001;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    min-width: 280px;
    transform: translateX(120%);
    transition: transform var(--transition-normal);
}

.toast.show {
    transform: translateX(0);
}

.toast-icon {
    font-size: 1.5rem;
}

.toast-title {
    font-weight: 500;
}

.toast-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.toast.toast-buzz {
    border-color: var(--warning);
    animation: shake 0.5s ease-in-out;
}

.toast.toast-dm {
    border-color: var(--info);
}
.toast.toast-alert {
    border-color: var(--danger);
}

@keyframes shake {
    0%,
    100% {
        transform: translateX(0);
    }
    20%,
    60% {
        transform: translateX(-5px);
    }
    40%,
    80% {
        transform: translateX(5px);
    }
}

/* Spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* =============================================================================
   UTILITIES
   ============================================================================= */

.hidden {
    display: none !important;
}

/* =============================================================================
   RESPONSIVE
   ============================================================================= */

/* Tablet - sidebar hidden but 2 column layout preserved */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

    .main-content {
        margin-left: 0;
    }

    .status-bar {
        left: 0;
    }

    .lobby-layout {
        grid-template-columns: 280px 1fr;
        height: auto;
        min-height: calc(100vh - var(--topbar-height) - var(--statusbar-height) - var(--space-xl) * 2);
    }

    .lobby-layout:has(.video-area.hidden) .participants-panel {
        max-width: none;
        max-height: none;
    }

    .participants-panel {
        max-height: none;
        overflow-y: auto;
    }

    .video-area {
        min-height: 300px;
    }

    .settings-panel {
        width: 100%;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    /* Overlay when sidebar is open */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
    }

    .sidebar-overlay.show {
        display: block;
    }
}

/* Small tablets — keep lobby sidebar + video in two columns between 641px and 768px */
@media (max-width: 768px) and (min-width: 641px) {
    .lobby-layout {
        grid-template-columns: minmax(240px, 280px) 1fr;
        grid-template-rows: auto 1fr;
        gap: var(--space-md);
    }

    .lobby-room-card {
        grid-column: 1;
        grid-row: 1;
    }

    .participants-panel {
        grid-column: 1;
        grid-row: 2;
        max-height: none;
    }

    .video-area {
        grid-column: 2;
        grid-row: 1 / span 2;
        min-height: 0;
    }
}

/* Narrow phones — lobby tweaks live in max-width: 640px blocks */
@media (max-width: 768px) {
    .video-header {
        align-items: flex-start;
        padding: var(--space-sm) var(--space-md);
    }

    .video-header-left,
    .video-header-right {
        width: 100%;
    }

    .video-header-right {
        justify-content: space-between;
    }

    #toggle-screen-share-lobby-btn {
        flex: 1 1 auto;
        min-width: 0;
    }

    .participants-list {
        padding: var(--space-sm);
    }

    .participant-item {
        padding: var(--space-xs) var(--space-sm);
    }

    .participant-name-device strong {
        max-width: 100px;
        font-size: 0.75rem;
    }

    .participant-status .status-icon {
        font-size: 0.65rem;
    }

    .room-stats {
        padding: var(--space-sm);
    }

    .stat-value {
        font-size: 1.1rem;
    }

    .stat-label {
        font-size: 0.6rem;
    }

    .panel-header {
        padding: var(--space-sm) var(--space-md);
    }

    .panel-header h3 {
        font-size: 0.85rem;
    }

    .panel-actions {
        padding: var(--space-sm);
        gap: var(--space-xs);
    }

    .panel-actions .btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.8rem;
    }
}

/* Mobile */
@media (max-width: 640px) {
    .video-header {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-xs);
    }

    .video-header-left {
        display: grid;
        grid-template-columns: auto 1fr;
        align-items: center;
        gap: var(--space-sm);
    }

    .video-header-right {
        display: grid;
        grid-template-columns: 1fr auto;
        align-items: center;
        gap: var(--space-xs);
    }

    #toggle-screen-share-lobby-btn {
        width: 100%;
    }

    .video-info-bar {
        align-items: flex-start;
    }

    .video-label,
    .video-label-text {
        max-width: 100%;
        flex-basis: 100%;
    }

    .video-status-indicators {
        width: 100%;
        justify-content: flex-start;
    }

    :root {
        --space-xl: 1rem;
        --space-2xl: 1.25rem;
    }

    .auth-section {
        max-width: 100%;
        margin-top: var(--space-md);
    }

    .auth-card {
        padding: var(--space-md);
        margin: 0;
        border-radius: var(--radius-lg);
    }

    .auth-header h2 {
        font-size: 1.25rem;
    }

    .lobby-layout {
        gap: var(--space-sm);
        padding: 0;
    }

    .participants-panel {
        border-radius: var(--radius-md);
    }

    .participants-list {
        padding: var(--space-xs);
    }

    .participant-item {
        padding: 6px 8px;
        gap: 6px;
        margin-bottom: 4px;
    }

    .participant-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.65rem;
    }

    .participant-name-device {
        gap: 4px;
    }

    .participant-name-device strong {
        max-width: 80px;
        font-size: 0.7rem;
    }

    .participant-name-device small {
        font-size: 0.6rem;
    }

    .participant-status {
        gap: 3px;
    }

    .participant-status .status-icon {
        font-size: 0.6rem;
    }

    .participant-status .kick-btn {
        padding: 1px 4px;
        font-size: 0.55rem;
    }

    /* Stack tiles vertically — avoids grid/flex height bugs that overlap tiles on mobile WebKit */
    .video-grid {
        display: flex;
        flex-direction: column;
        flex-wrap: nowrap;
        align-items: stretch;
        gap: var(--space-md);
        padding: var(--space-sm);
        /* Room below last tile: fixed status bar + home indicator would otherwise hide the bottom */
        padding-bottom: calc(
            var(--space-sm) +
            var(--statusbar-height) +
            env(safe-area-inset-bottom, 0px) +
            var(--space-lg)
        );
        scroll-padding-bottom: calc(var(--statusbar-height) + env(safe-area-inset-bottom, 0px) + var(--space-md));
        box-sizing: border-box;
    }

    .video-container,
    .remote-video-container {
        width: 100% !important;
        max-width: 100%;
        flex: 0 0 auto;
        position: relative;
        z-index: 0;
    }

    .video-container video,
    .remote-video-container video {
        min-height: 0;
        max-height: none;
        width: 100% !important;
        aspect-ratio: 16 / 9;
    }

    .video-info-bar {
        padding: var(--space-xs) var(--space-sm);
        gap: 4px 6px;
    }

    .video-label,
    .video-label-text {
        font-size: 0.75rem;
        max-width: min(140px, 40vw);
    }

    .video-status-indicators {
        gap: 3px;
        justify-content: flex-end;
    }

    .status-indicator {
        width: 28px;
        height: 28px;
        font-size: 0.85rem;
    }

    .action-btn {
        padding: 4px 8px;
        font-size: 0.7rem;
    }

    .room-stats {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-xs);
        padding: var(--space-sm);
    }

    .stat-value {
        font-size: 1rem;
    }

    .stat-label {
        font-size: 0.6rem;
    }

    .top-bar {
        padding: 0 var(--space-sm);
        height: 50px;
    }

    .page-title {
        font-size: 1rem;
    }

    .content-area {
        padding: var(--space-sm);
        padding-top: var(--space-md);
    }

    /* Bound lobby viewport — flex chain needs min-height:0 so nested scroll works */
    .main-content:has(.lobby-section:not(.hidden)) {
        min-height: 0;
        overflow: hidden;
    }

    .content-area:has(.lobby-section:not(.hidden)) {
        display: flex;
        flex-direction: column;
        overflow: hidden;
        flex: 1 1 0%;
        min-height: 0;
        /* dvh tracks visible viewport on mobile; vh fallback for older engines */
        max-height: calc(100vh - var(--topbar-height) - var(--statusbar-height) - var(--space-md));
        max-height: calc(100dvh - var(--topbar-height) - var(--statusbar-height) - var(--space-md));
    }

    .content-area:has(.lobby-section:not(.hidden)) .lobby-section {
        flex: 1 1 0%;
        min-height: 0;
        overflow: hidden;
    }

    .panel-actions {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .panel-actions .btn {
        width: 100%;
    }

    .video-area {
        min-height: 0;
        border-radius: var(--radius-md);
    }

    .video-area .video-header {
        position: relative;
        flex-shrink: 0;
        z-index: 2;
    }

    .participant-item {
        padding: var(--space-sm);
    }

    .participant-avatar {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    .participant-name {
        font-size: 0.8rem;
    }

    .status-bar {
        padding: 0 var(--space-sm);
        font-size: 0.65rem;
        gap: var(--space-md);
        flex-wrap: wrap;
        height: auto;
        min-height: var(--statusbar-height);
        padding-top: var(--space-xs);
        padding-bottom: var(--space-xs);
    }

    .modal-content {
        width: 95%;
        max-width: none;
        margin: var(--space-md);
        padding: var(--space-md);
    }

    .toast {
        min-width: auto;
        max-width: calc(100vw - 2rem);
        margin: var(--space-sm);
    }

    .form-group input,
    .select-input {
        padding: var(--space-sm);
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.875rem;
    }
}

/* Very small screens */
@media (max-width: 380px) {
    .auth-card {
        padding: var(--space-sm);
    }

    .participant-item {
        padding: 4px 6px;
        gap: 4px;
    }

    .participant-avatar {
        width: 24px;
        height: 24px;
        font-size: 0.55rem;
    }

    .participant-name-device strong {
        max-width: 60px;
        font-size: 0.65rem;
    }

    .participant-name-device small {
        display: none;
    }

    .participant-status .status-icon {
        font-size: 0.55rem;
    }

    .participant-status .kick-btn {
        display: none;
    }

    .video-info-bar {
        padding: 4px 6px;
        min-height: 40px;
    }

    .video-status-indicators {
        gap: 2px;
    }

    .status-indicator {
        width: 24px;
        height: 24px;
        font-size: 0.75rem;
    }

    .video-label,
    .video-label-text {
        max-width: 60px;
        font-size: 0.65rem;
    }

    .participant-actions {
        flex-wrap: wrap;
    }

    .room-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .panel-header h3 {
        font-size: 0.9rem;
    }
}

/* Landscape mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .video-grid {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-start;
        align-content: flex-start;
        gap: var(--space-sm);
    }

    .video-container,
    .remote-video-container {
        flex: 1 1 160px;
        min-width: 0;
        max-width: 100%;
    }

    .video-container video,
    .remote-video-container video {
        min-height: 100px;
        max-height: 150px;
    }

    .auth-card {
        padding: var(--space-sm);
    }

    .content-area {
        padding-top: var(--space-sm);
    }
}

/* =============================================================================
   MOBILE: participants list as off-canvas sidebar (drawer)
   ============================================================================= */

@media (min-width: 641px) {
    .lobby-drawer-only,
    .participants-drawer-toolbar {
        display: none !important;
    }

    .participants-drawer-backdrop {
        display: none !important;
    }
}

@media (max-width: 640px) {
    .lobby-drawer-only {
        display: flex;
    }

    .participants-drawer-toolbar {
        width: 100%;
        margin-bottom: var(--space-sm);
    }

    .participants-drawer-open-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-sm);
        width: 100%;
        flex-wrap: wrap;
    }

    .participants-drawer-badge {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-width: 1.5rem;
        padding: 2px 8px;
        border-radius: var(--radius-full);
        background: var(--accent-primary);
        color: #fff;
        font-size: 0.75rem;
        font-weight: 600;
    }

    .participants-drawer-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 180;
        background: rgba(0, 0, 0, 0.45);
        -webkit-tap-highlight-color: transparent;
    }

    .participants-drawer-backdrop.is-visible {
        display: block;
    }

    /* Drawer panel: out of layout flow so video grid gets full width */
    .participants-panel {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: min(90vw, 320px);
        height: 100vh !important;
        max-height: none !important;
        margin: 0 !important;
        max-width: none;
        z-index: 190;
        transform: translateX(-105%);
        transition: transform 0.28s ease;
        border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
        box-shadow: var(--shadow-lg);
    }

    .participants-panel.is-drawer-open {
        transform: translateX(0);
    }

    /* Fill viewport height so the video list scrolls inside (touch) instead of clipping */
    .lobby-section {
        flex: 1 1 0%;
        overflow: hidden;
        min-height: 0;
    }

    /* Stack room card → Participants button → video */
    .lobby-layout {
        display: flex !important;
        flex-direction: column;
        align-items: stretch;
        flex: 1 1 0;
        min-height: 0 !important;
        height: auto !important;
        gap: var(--space-sm);
        overflow: hidden;
    }

    .lobby-room-card {
        flex: 0 0 auto;
        width: 100%;
    }

    .participants-drawer-toolbar {
        flex: 0 0 auto;
        width: 100%;
    }

    .video-area {
        grid-column: unset !important;
        grid-row: unset !important;
        flex: 1 1 0;
        min-height: 0 !important;
        width: 100%;
        overflow: hidden;
        touch-action: manipulation;
    }

    .video-area .video-grid {
        flex: 1 1 0;
        min-height: 0;
        touch-action: pan-y;
    }

    .lobby-layout:has(.video-area.hidden) {
        flex: 1 1 auto;
        overflow: visible;
    }
}