:root {
    --primary-bg: #0a0a0f;
    --secondary-bg: #141419;
    --card-bg: #1a1a24;
    --tile-bg: #11111a;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.18);

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.72);
    --text-muted: rgba(255, 255, 255, 0.5);

    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --danger: #dc2626;

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

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;

    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
}

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

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

.app { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
.main-app { display: flex; flex-direction: column; flex: 1; min-height: 0; width: 100%; }

/* ==================== AUTH SCREEN ==================== */
.auth-screen {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    flex: 1;
}
.auth-bg { position: absolute; inset: 0; z-index: 0; }
.auth-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.45;
}
.auth-glow-1 { width: 400px; height: 400px; background: var(--accent-primary); top: -100px; left: -100px; }
.auth-glow-2 { width: 360px; height: 360px; background: var(--accent-secondary); bottom: -80px; right: -80px; }

.auth-container {
    position: relative;
    z-index: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 440px;
    margin: var(--spacing-md);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.auth-header { text-align: center; margin-bottom: var(--spacing-lg); }
.auth-logo {
    width: 64px; height: 64px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 1.6rem;
    margin-bottom: var(--spacing-sm);
}
.auth-header h1 { font-size: 1.75rem; }
.auth-header p { color: var(--text-secondary); font-size: 0.95rem; margin-top: 0.25rem; }

.auth-tabs { display: flex; gap: var(--spacing-xs); margin-bottom: var(--spacing-lg); background: var(--secondary-bg); padding: 4px; border-radius: var(--radius-md); }
.auth-tab {
    flex: 1;
    padding: 0.55rem 0.8rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-size: 0.9rem;
}
.auth-tab.active { background: var(--accent-gradient); color: #fff; }

.auth-form { display: none; }
.auth-form.active { display: block; }

.form-group { margin-bottom: var(--spacing-md); }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.3rem; }
.form-group .muted { color: var(--text-muted); font-weight: 400; font-size: 0.8rem; }
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition-fast);
}
.form-group input:focus { outline: none; border-color: var(--accent-primary); }

.form-hint { color: var(--text-muted); font-size: 0.85rem; margin-top: var(--spacing-sm); text-align: center; }
.form-hint a { color: var(--accent-primary); text-decoration: none; }
.form-hint a:hover { text-decoration: underline; }

.prejoin-toggles { justify-content: center; flex-wrap: wrap; }
.prejoin-toggles .toggle { padding: 0.5rem 0.85rem; }

.prejoin-container { max-width: 520px; }

.prejoin-preview {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--tile-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}
.prejoin-preview video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
    display: none;
    transform: scaleX(-1); /* mirror so it feels like a mirror, not a camera */
}
.prejoin-preview-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #1a1a24, #2a2a3a);
    color: var(--text-secondary);
    pointer-events: none;
}
.prejoin-preview-placeholder .avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: #fff;
    font-weight: 600;
}
.prejoin-preview-placeholder .preview-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}
.prejoin-preview-badge {
    position: absolute;
    bottom: 0.6rem;
    left: 0.6rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.6rem;
    background: rgba(0, 0, 0, 0.55);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: #fff;
    backdrop-filter: blur(4px);
    pointer-events: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.1rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
    color: #fff;
    text-decoration: none;
}
.btn-primary { background: var(--accent-gradient); }
.btn-primary:hover { filter: brightness(1.1); }
.btn-secondary { background: var(--secondary-bg); border: 1px solid var(--border-strong); }
.btn-secondary:hover { background: var(--card-bg); }
.btn-block { width: 100%; }
.btn-icon {
    width: 38px; height: 38px;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center; justify-content: center;
    padding: 0;
}
.btn-icon:hover { background: var(--card-bg); }
.btn-small { width: 30px; height: 30px; font-size: 0.8rem; }
.btn-fast { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.btn-fast:hover { filter: brightness(1.1); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.auth-error, .lobby-error { color: var(--error); font-size: 0.85rem; margin-top: var(--spacing-sm); min-height: 1.1em; text-align: center; }

/* ==================== HEADER ==================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(20, 20, 25, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 10;
    flex-wrap: nowrap;
}
.header-left { display: flex; align-items: center; gap: var(--spacing-md); min-width: 0; }
.header-left h1 { font-size: 1.25rem; display: flex; align-items: center; gap: 0.5rem; white-space: nowrap; }
.header-left h1 i { color: var(--accent-primary); }
.header-actions { display: flex; align-items: center; gap: var(--spacing-sm); flex-wrap: nowrap; }
.user-badge {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.4rem 0.75rem;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.user-badge .user-name { color: var(--text-primary); font-weight: 500; }
.back-btn {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    display: inline-flex; align-items: center; gap: 0.4rem;
    white-space: nowrap;
    flex-shrink: 0;
}
.back-btn:hover { color: var(--text-primary); background: var(--secondary-bg); }

/* ==================== LOBBY ==================== */
.main { flex: 1; padding: var(--spacing-xl) var(--spacing-lg); }
.lobby-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 880px;
    margin: 0 auto;
}
.lobby-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    display: flex;
    flex-direction: column;
}
.lobby-icon {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 1.4rem;
    align-self: center;
}
.lobby-card h2 { font-size: 1.2rem; margin-bottom: 0.4rem; }
.lobby-card > p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: var(--spacing-md); }
.lobby-card .form-group { text-align: left; }
.lobby-card .lobby-error { text-align: center; }
.lobby-card .btn-block { margin-top: auto; }

.toggles { display: flex; gap: var(--spacing-md); justify-content: center; }
.toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.7rem;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}
.toggle input { accent-color: var(--accent-primary); }
.toggle:has(input:checked) { color: var(--text-primary); border-color: var(--accent-primary); }

/* ==================== CALL SCREEN ==================== */
.call { display: flex; flex-direction: column; gap: var(--spacing-md); padding-bottom: 110px; max-width: 1400px; margin: 0 auto; width: 100%; }

.call-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}
.call-bar-left { display: flex; align-items: center; gap: var(--spacing-md); flex-wrap: wrap; }
.room-name { font-weight: 600; font-size: 1rem; }
.room-code { display: flex; align-items: center; gap: 0.4rem; color: var(--text-secondary); font-size: 0.85rem; }
.room-code code {
    background: var(--secondary-bg);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
    font-family: 'SF Mono', Monaco, Consolas, monospace;
}
.participant-count {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.7rem;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
}
.participant-count i { color: var(--accent-primary); }

/* Tile grid auto-balances based on count */
.tile-grid {
    display: grid;
    gap: var(--spacing-sm);
    grid-template-columns: 1fr;
    flex: 1;
}
.tile-grid[data-count="1"] { max-width: 720px; margin: 0 auto; width: 100%; }
.tile-grid[data-count="2"] { grid-template-columns: repeat(2, 1fr); }
.tile-grid[data-count="3"],
.tile-grid[data-count="4"] { grid-template-columns: repeat(2, 1fr); }
.tile-grid[data-count="5"],
.tile-grid[data-count="6"] { grid-template-columns: repeat(3, 1fr); }
.tile-grid[data-count="7"],
.tile-grid[data-count="8"],
.tile-grid[data-count="9"] { grid-template-columns: repeat(3, 1fr); }
.tile-grid[data-screen="true"] { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)) !important; }

.tile {
    position: relative;
    background: var(--tile-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16 / 9;
    min-height: 160px;
    max-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.tile.speaking { border-color: var(--success); box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.4); }
.tile.screen-tile { aspect-ratio: auto; min-height: 360px; max-height: none; grid-column: 1 / -1; }
.tile video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
    display: block;
}
.tile.screen-tile video { object-fit: contain; background: #000; }
.tile-placeholder {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    background: linear-gradient(135deg, #1a1a24, #2a2a3a);
    color: var(--text-secondary);
    pointer-events: none;
}
.tile-placeholder .avatar {
    width: 72px; height: 72px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.6rem;
    color: #fff;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.tile.has-video .tile-placeholder { display: none; }
.tile-info {
    position: absolute;
    bottom: 0.5rem;
    left: 0.5rem;
    right: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
}
.tile-name {
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
}
.tile-icons { display: flex; gap: 0.25rem; }
.tile-icons span {
    background: rgba(0, 0, 0, 0.55);
    padding: 0.25rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    backdrop-filter: blur(4px);
}
.tile-icons .muted { color: var(--error); }
.tile-icons .on { color: var(--success); }

.tile.self .tile-name::after { content: ' (you)'; color: var(--text-muted); }

/* Control bar */
.control-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(10, 10, 15, 0.92);
    border-top: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    z-index: 5;
}
.ctrl {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    min-width: 76px;
    padding: 0.5rem 0.85rem;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.78rem;
    cursor: pointer;
    transition: var(--transition-fast);
}
.ctrl i { font-size: 1.05rem; }
.ctrl:hover { background: var(--card-bg); }
.ctrl.active { background: var(--accent-gradient); border-color: transparent; }
.ctrl.warning { background: var(--warning); border-color: transparent; color: #1a1a24; }
.ctrl.warning:hover { filter: brightness(1.1); }
.ctrl-leave { background: var(--danger); border-color: transparent; }
.ctrl-leave:hover { background: #b91c1c; }

/* ==================== TOASTS ==================== */
.toast-container {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 1000;
    max-width: calc(100vw - 2rem);
}
.toast {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 0.85rem;
    min-width: 240px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--error); }
.toast.info    { border-left: 3px solid var(--accent-primary); }
.toast.credentials {
    border-left: 3px solid var(--warning);
    flex-direction: column;
    gap: 0.4rem;
    max-width: 360px;
    position: relative;
    padding-right: 2.2rem;
}
.toast.credentials strong { display: flex; align-items: center; gap: 0.4rem; }
.toast.credentials .cred-line {
    background: var(--secondary-bg);
    padding: 0.3rem 0.5rem;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.85rem;
    word-break: break-all;
}
.toast.credentials .close-toast {
    position: absolute;
    top: 0.4rem; right: 0.4rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.25rem;
}
.toast.credentials .close-toast:hover { color: var(--text-primary); }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 720px) {
    .header { padding: 0.6rem 0.75rem; gap: 0.4rem; }
    .header-left { gap: 0.5rem; }
    .header-left h1 { font-size: 1.05rem; }
    .header-actions { gap: 0.4rem; }
    .back-btn span { display: none; }
    .back-btn { padding: 0.4rem 0.55rem; }
    .user-badge { padding: 0.35rem 0.55rem; font-size: 0.8rem; }
    .user-badge .user-name { max-width: 90px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .main { padding: var(--spacing-md); }
    .auth-container { padding: var(--spacing-lg); }
    .control-bar { padding: 0.6rem 0.5rem; gap: 0.4rem; }
    .ctrl { min-width: 64px; padding: 0.45rem 0.5rem; flex: 1; max-width: 90px; }
    .ctrl span { font-size: 0.7rem; }
    .call { padding-bottom: 96px; }
    .tile-grid,
    .tile-grid[data-count="2"],
    .tile-grid[data-count="3"],
    .tile-grid[data-count="4"] { grid-template-columns: 1fr !important; }
    .tile-grid[data-count="5"],
    .tile-grid[data-count="6"],
    .tile-grid[data-count="7"],
    .tile-grid[data-count="8"],
    .tile-grid[data-count="9"] { grid-template-columns: repeat(2, 1fr) !important; }
    .tile-grid[data-screen="true"] { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)) !important; }
    .tile { max-height: 50vh; min-height: 140px; }
    .tile.screen-tile { min-height: 220px; }
    .lobby-card { padding: var(--spacing-lg); }
    .call-bar { padding: var(--spacing-sm); }
}
@media (max-width: 480px) {
    .user-badge .user-name { max-width: 70px; }
    .header-left h1 span,
    .user-badge i + .user-name { display: inline; }
}
@media (max-width: 380px) {
    .auth-tab { padding: 0.45rem; font-size: 0.8rem; }
    .ctrl { min-width: 50px; padding: 0.4rem 0.3rem; }
    .ctrl span { font-size: 0.65rem; }
    .ctrl i { font-size: 0.95rem; }
    .user-badge { display: none !important; }
    .header-left h1 { font-size: 1rem; }
}