:root {
    --md-primary: #6750a4;
    --md-on-primary: #ffffff;
    --md-primary-container: #eaddff;
    --md-on-primary-container: #21005d;
    --md-surface: #fef7ff;
    --md-surface-container: #f3edf7;
    --md-surface-container-high: #ece6f0;
    --md-on-surface: #1d1b20;
    --md-on-surface-variant: #49454f;
    --md-outline: #79747e;
    --md-error: #b3261e;
    --md-success: #386a20;
    --md-shadow: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
    --md-radius: 12px;
    --sidebar-width: 260px;
}

[data-theme="dark"] {
    --md-primary: #d0bcff;
    --md-on-primary: #381e72;
    --md-primary-container: #4f378b;
    --md-on-primary-container: #eaddff;
    --md-surface: #141218;
    --md-surface-container: #211f26;
    --md-surface-container-high: #2b2930;
    --md-on-surface: #e6e0e9;
    --md-on-surface-variant: #cac4d0;
    --md-outline: #938f99;
    --md-error: #f2b8b5;
    --md-success: #a8d5a2;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: var(--md-surface);
    color: var(--md-on-surface);
    line-height: 1.5;
}

.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    vertical-align: middle;
}

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    background: var(--md-surface-container);
    border-right: 1px solid var(--md-outline);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
    transition: transform .2s;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: 1.25rem 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--md-primary);
}

.sidebar-nav { flex: 1; padding: .5rem; overflow-y: auto; }

.nav-item {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .75rem 1rem;
    border-radius: var(--md-radius);
    color: var(--md-on-surface-variant);
    text-decoration: none;
    margin-bottom: .25rem;
    transition: background .15s;
}

.nav-item:hover { background: var(--md-surface-container-high); color: var(--md-on-surface); }
.nav-item.active { background: var(--md-primary-container); color: var(--md-on-primary-container); font-weight: 500; }

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--md-outline);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.main-area {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--md-surface-container);
    border-bottom: 1px solid var(--md-outline);
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-title { margin: 0; font-size: 1.5rem; font-weight: 500; flex: 1; }

.mobile-menu { display: none; }

.user-chip {
    text-align: right;
    font-size: .875rem;
}
.user-chip small { display: block; color: var(--md-on-surface-variant); }

.page-content { padding: 1.5rem; max-width: 1200px; }

.card {
    background: var(--md-surface-container);
    border-radius: var(--md-radius);
    padding: 1.25rem;
    box-shadow: var(--md-shadow);
    margin-bottom: 1rem;
}

.card-title {
    margin: 0 0 1rem;
    font-size: 1.125rem;
    font-weight: 500;
}

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.btn, .btn-filled, .btn-outlined, .btn-text, .btn-icon {
    font-family: inherit;
    cursor: pointer;
    border: none;
    border-radius: 999px;
    font-size: .875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    text-decoration: none;
    transition: opacity .15s;
}

.btn-filled, .btn {
    background: var(--md-primary);
    color: var(--md-on-primary);
    padding: .625rem 1.5rem;
}
.btn-filled:hover, .btn:hover { opacity: .9; }

.btn-outlined {
    background: transparent;
    color: var(--md-primary);
    border: 1px solid var(--md-outline);
    padding: .625rem 1.5rem;
}

.btn-text {
    background: transparent;
    color: var(--md-primary);
    padding: .5rem 1rem;
}

.btn-icon {
    background: transparent;
    color: var(--md-on-surface);
    padding: .5rem;
    border-radius: 50%;
}
.btn-icon:hover { background: var(--md-surface-container-high); }

.btn-danger { background: var(--md-error); color: #fff; padding: .5rem 1rem; border-radius: 999px; border: none; cursor: pointer; }

.form-group { margin-bottom: 1rem; }

label {
    display: block;
    font-size: .875rem;
    color: var(--md-on-surface-variant);
    margin-bottom: .375rem;
}

input[type="text"], input[type="email"], input[type="password"], input[type="number"],
input[type="url"], input[type="datetime-local"], input[type="date"], input[type="file"],
select, textarea {
    width: 100%;
    padding: .75rem 1rem;
    border: 1px solid var(--md-outline);
    border-radius: 8px;
    background: var(--md-surface);
    color: var(--md-on-surface);
    font-family: inherit;
    font-size: 1rem;
}

textarea { min-height: 120px; resize: vertical; }

input:focus, select:focus, textarea:focus {
    outline: 2px solid var(--md-primary);
    outline-offset: 1px;
}

.error-text { color: var(--md-error); font-size: .8125rem; margin-top: .25rem; }

.alert {
    padding: .875rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}
.alert-success { background: #e8f5e9; color: var(--md-success); }
[data-theme="dark"] .alert-success { background: #1b3a1a; }
.alert-error { background: #fce8e6; color: var(--md-error); }
[data-theme="dark"] .alert-error { background: #3d1a18; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: .75rem; text-align: left; border-bottom: 1px solid var(--md-outline); }
th { font-weight: 500; color: var(--md-on-surface-variant); font-size: .875rem; }

.badge {
    display: inline-block;
    padding: .2rem .6rem;
    border-radius: 999px;
    font-size: .75rem;
    font-weight: 500;
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
}

.badge-pending { background: #fff3e0; color: #e65100; }
.badge-confirmed { background: #e8f5e9; color: #2e7d32; }
.badge-unavailable { background: #fce8e6; color: #c62828; }

.chip-row { display: flex; flex-wrap: wrap; gap: .5rem; }

.progress-bar {
    height: 8px;
    background: var(--md-surface-container-high);
    border-radius: 4px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: var(--md-primary);
    border-radius: 4px;
}

.sortable-list { list-style: none; padding: 0; margin: 0; }
.sortable-item {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .75rem 1rem;
    background: var(--md-surface);
    border: 1px solid var(--md-outline);
    border-radius: 8px;
    margin-bottom: .5rem;
    cursor: grab;
}
.sortable-item.dragging { opacity: .5; }

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}
.calendar-header {
    text-align: center;
    font-size: .75rem;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    padding: .5rem;
}
.calendar-day {
    min-height: 80px;
    padding: .375rem;
    background: var(--md-surface);
    border: 1px solid var(--md-outline);
    border-radius: 4px;
    font-size: .8125rem;
}
.calendar-day.other-month { opacity: .4; }
.calendar-day.today { border-color: var(--md-primary); border-width: 2px; }
.calendar-event-dot {
    display: block;
    font-size: .6875rem;
    padding: .125rem .25rem;
    margin-top: .125rem;
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    border-radius: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.audio-player {
    position: sticky;
    bottom: 0;
    background: var(--md-surface-container-high);
    padding: 1rem;
    border-radius: var(--md-radius);
    margin-top: 1rem;
}
.audio-player audio { width: 100%; margin-top: .5rem; }

.invite-code {
    font-family: monospace;
    font-size: 1.5rem;
    letter-spacing: .2em;
    padding: 1rem;
    background: var(--md-surface);
    border-radius: 8px;
    text-align: center;
}

/* Performance mode */
.performance-body {
    background: #000;
    color: #fff;
    min-height: 100vh;
    overflow: hidden;
}

.performance-screen {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.performance-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: rgba(255,255,255,.08);
    position: sticky;
    top: 0;
    z-index: 10;
}

.performance-controls button {
    background: rgba(255,255,255,.15);
    border: none;
    color: #fff;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.performance-controls button:active { background: rgba(255,255,255,.3); }

.performance-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
}

.performance-song-title {
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin: 0 0 1.5rem;
    word-break: break-word;
}

.performance-meta {
    display: flex;
    gap: 2rem;
    font-size: clamp(1.25rem, 4vw, 2rem);
    opacity: .85;
}

.performance-meta span {
    display: flex;
    align-items: center;
    gap: .5rem;
}

.performance-footer {
    padding: 1rem;
    text-align: center;
    opacity: .5;
    font-size: .875rem;
}

.metronome-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: .75rem 1rem;
    background: rgba(255,255,255,.06);
    border-bottom: 1px solid rgba(255,255,255,.1);
    flex-wrap: wrap;
}

.metronome-label {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: .05em;
    opacity: .9;
}

.metronome-controls {
    display: flex;
    gap: .5rem;
}

.metro-btn {
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.2);
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background .15s, transform .1s;
}

.metro-btn:hover { background: rgba(255,255,255,.2); }
.metro-btn:active { transform: scale(0.95); }
.metro-btn.active {
    background: rgba(255,255,255,.28);
    border-color: rgba(255,255,255,.45);
}

.metronome-beat-line {
    position: fixed;
    top: 0;
    bottom: 0;
    width: 12px;
    background: #fff;
    z-index: 200;
    pointer-events: none;
    opacity: 0;
    transition: left 0.1s ease-out, right 0.1s ease-out, opacity 0.05s ease-out;
}

.metronome-beat-line.is-active {
    opacity: 1;
}

.metronome-beat-line.is-left {
    left: 0;
    right: auto;
}

.metronome-beat-line.is-right {
    right: 0;
    left: auto;
}

/* Guest / auth pages */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--md-surface);
}
.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--md-surface-container);
    padding: 2rem;
    border-radius: var(--md-radius);
    box-shadow: var(--md-shadow);
}
.auth-brand {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--md-primary);
    font-size: 1.75rem;
    font-weight: 700;
}

.welcome-hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--md-primary-container), var(--md-surface));
}
.welcome-hero h1 { font-size: 3rem; margin: 0 0 .5rem; color: var(--md-primary); }
.welcome-hero p { font-size: 1.125rem; color: var(--md-on-surface-variant); max-width: 500px; }
.welcome-actions { display: flex; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; justify-content: center; }

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--md-on-surface-variant);
}

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-area { margin-left: 0; }
    .mobile-menu { display: inline-flex; }
    .page-content { padding: 1rem; }
}