:root {
    --ks-bg-deep: #0c0e13;
    --ks-bg-surface: #14171e;
    --ks-bg-elevated: #1c2029;
    --ks-border: #2a2e3a;
    --ks-border-subtle: #1f2330;
    --ks-text-primary: #e8e6e1;
    --ks-text-secondary: #8b8a85;
    --ks-text-muted: #5c5b57;
    --ks-accent: #c9a84c;
    --ks-accent-dim: rgba(201, 168, 76, 0.15);
    --ks-accent-hover: #dab95d;
    --ks-red: #b54a4a;
    --ks-red-dim: rgba(181, 74, 74, 0.15);
    --ks-sidebar-width: 28%;
    --ks-player-height: 56px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Noto Sans', sans-serif;
    background: var(--ks-bg-deep);
    color: var(--ks-text-primary);
    padding-bottom: calc(var(--ks-player-height) + 12px);
    margin: 0;
}

h1, h2, h3 {
    font-family: 'Literata', Georgia, serif;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.ks-header {
    padding: 1.5rem 2rem 0.75rem;
    border-bottom: 1px solid var(--ks-border-subtle);
    margin-bottom: 1rem;
}

.ks-header h1 {
    font-size: 1.4rem;
    margin: 0 0 0.75rem;
    color: var(--ks-accent);
    font-weight: 300;
    letter-spacing: 0.12em;
}

.ks-header input[type="search"] {
    background: var(--ks-bg-elevated);
    border: 1px solid var(--ks-border);
    color: var(--ks-text-primary);
    border-radius: 4px;
    padding: 0.45rem 0.75rem;
    font-size: 0.85rem;
    width: 100%;
    max-width: 340px;
    margin-bottom: 0;
    outline: none;
    transition: border-color 0.2s;
}

.ks-header input[type="search"]:focus {
    border-color: var(--ks-accent);
}

.ks-header input[type="search"]::placeholder {
    color: var(--ks-text-muted);
}

.ks-table-wrap {
    padding: 0 2rem;
    overflow-x: auto;
}

table[data-testid="dance-table"] {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

table[data-testid="dance-table"] thead th {
    cursor: pointer;
    user-select: none;
    font-family: 'Noto Sans', sans-serif;
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ks-text-muted);
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--ks-border);
    text-align: left;
    white-space: nowrap;
}

table[data-testid="dance-table"] thead th:hover {
    color: var(--ks-text-secondary);
}

table[data-testid="dance-table"] tbody tr {
    cursor: pointer;
    transition: background 0.15s;
}

table[data-testid="dance-table"] tbody tr:hover {
    background: var(--ks-bg-elevated);
}

table[data-testid="dance-table"] tbody td {
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid var(--ks-border-subtle);
    color: var(--ks-text-primary);
    vertical-align: middle;
}

table[data-testid="dance-table"] tbody td:nth-child(3),
table[data-testid="dance-table"] tbody td:nth-child(4) {
    color: var(--ks-text-secondary);
    font-variant-numeric: tabular-nums;
}

/* Compact button base */
.ks-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    color: var(--ks-text-secondary);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.75rem;
    line-height: 1;
    height: 24px;
    min-width: 0;
    width: auto;
    margin: 0;
    transition: color 0.15s, background 0.15s;
}

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

.ks-btn--accent {
    color: var(--ks-accent);
}

.ks-btn--accent:hover {
    color: var(--ks-accent-hover);
    background: var(--ks-accent-dim);
}

.ks-btn--danger {
    color: var(--ks-red);
}

.ks-btn--danger:hover {
    background: var(--ks-red-dim);
}

.ks-btn--small {
    font-size: 0.65rem;
    height: 20px;
    padding: 1px 5px;
}

/* Shared sidebar backdrop + panel */
.ks-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    pointer-events: auto;
    cursor: pointer;
}

.ks-sidebar-panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: var(--ks-sidebar-width);
    background: var(--ks-bg-surface);
    border-left: 1px solid var(--ks-border);
    overflow-y: auto;
    padding: 1.25rem 1.5rem 5rem;
}

[data-testid="dance-detail-backdrop"] { z-index: 200; }
[data-testid="dance-detail"] {
    z-index: 202;
    transform: translateX(0);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-testid="lesson-sidebar-backdrop"] { z-index: 210; }
[data-testid="lesson-sidebar"] { z-index: 211; }

@media (max-width: 768px) {
    .ks-sidebar-panel {
        width: 100%;
    }
    .ks-header { padding: 1rem 1rem 0.5rem; }
    .ks-table-wrap { padding: 0 1rem; }
}

.ks-sidebar-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.ks-sidebar-close {
    flex-shrink: 0;
    font-size: 1.25rem;
    width: 36px;
    height: 36px;
}

.ks-sidebar-actions-mobile {
    display: none;
}

.ks-sidebar-fields {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

/* Shared input base */
.ks-input {
    background: var(--ks-bg-elevated);
    border: 1px solid var(--ks-border);
    color: var(--ks-text-primary);
    border-radius: 3px;
    padding: 0.35rem 0.5rem;
    font-size: 0.85rem;
    width: 100%;
    margin: 0;
    outline: none;
    transition: border-color 0.2s;
}

.ks-input:focus {
    border-color: var(--ks-accent);
}

.ks-sidebar-fields .ks-input {
    font-family: 'Literata', Georgia, serif;
}

.ks-section-title {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ks-text-muted);
    margin: 1rem 0 0.4rem;
    font-family: 'Noto Sans', sans-serif;
    font-weight: 600;
}

.ks-yt-list {
    list-style: none;
    padding: 0;
    margin: 0 0 0.5rem;
}

.ks-yt-list li {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--ks-border-subtle);
    flex-wrap: wrap;
}

.ks-yt-list li a {
    color: var(--ks-accent);
    text-decoration: none;
    font-size: 0.8rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.ks-yt-list li a:hover {
    color: var(--ks-accent-hover);
    text-decoration: underline;
}

.ks-yt-add {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.4rem;
}

.ks-yt-add .ks-input {
    padding: 0.3rem 0.5rem;
    font-size: 0.78rem;
    flex: 1;
    width: auto;
}

.ks-move-search {
    width: 100%;
    margin-top: 0.25rem;
}

.ks-move-search .ks-input {
    padding: 0.3rem 0.5rem;
    font-size: 0.78rem;
}

.ks-move-results {
    list-style: none;
    padding: 0;
    margin: 0.25rem 0 0;
    background: var(--ks-bg-elevated);
    border: 1px solid var(--ks-border);
    border-radius: 3px;
    max-height: 140px;
    overflow-y: auto;
}

.ks-move-results li {
    padding: 0.35rem 0.5rem;
    font-size: 0.78rem;
    cursor: pointer;
    border-bottom: 1px solid var(--ks-border-subtle);
}

.ks-move-results li:last-child {
    border-bottom: none;
}

.ks-move-results li:hover {
    background: var(--ks-accent-dim);
    color: var(--ks-accent);
}

.ks-track-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ks-track-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0;
    border-bottom: 1px solid var(--ks-border-subtle);
    font-size: 0.8rem;
    flex-wrap: wrap;
}

.ks-track-list .ks-track-info {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ks-track-list .ks-track-artist {
    color: var(--ks-text-secondary);
}

.ks-track-list .ks-track-dur {
    color: var(--ks-text-muted);
    font-size: 0.72rem;
    font-variant-numeric: tabular-nums;
}

.ks-lesson-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ks-lesson-list li {
    padding: 0.2rem 0;
    font-size: 0.8rem;
    color: var(--ks-text-secondary);
    font-variant-numeric: tabular-nums;
}

/* Audio player */
[data-testid="audio-player"] {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--ks-player-height);
    background: var(--ks-bg-surface);
    border-top: 1px solid var(--ks-border);
    padding: 0 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 300;
}

[data-testid="audio-player"] .ks-btn {
    height: 28px;
    width: 36px;
    font-size: 0.8rem;
}

[data-testid="player-progress"] {
    flex: 1;
    min-width: 60px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--ks-border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    margin: 0;
}

[data-testid="player-progress"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--ks-accent);
    cursor: pointer;
}

[data-testid="audio-player"] [data-testid="switch-song-button"],
[data-testid="audio-player"] [data-testid="shuffle-mode-button"],
[data-testid="audio-player"] [data-testid="shuffle-config-button"] {
    width: auto;
    height: auto;
    padding: 4px 10px;
    flex-shrink: 0;
}

[data-testid="player-dance-info"],
[data-testid="player-track-info"] {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
    flex: 0 1 auto;
    max-width: 220px;
    gap: 1px;
}

[data-testid="player-dance-info"] .ks-player-label {
    font-family: 'Literata', Georgia, serif;
    color: var(--ks-accent);
}

[data-testid="player-track-info"] {
    padding-left: 0.75rem;
    border-left: 1px solid var(--ks-border-subtle);
}

.ks-player-label {
    font-size: 0.88rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
}

.ks-player-sublabel {
    font-size: 0.6rem;
    color: var(--ks-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

[data-testid="shuffle-mode-button"] {
    border: 1px solid var(--ks-border);
    border-radius: 4px;
    padding: 4px 10px;
    font-weight: 600;
    letter-spacing: 0.03em;
    transition: color 0.2s, background 0.2s, border-color 0.2s;
}

[data-testid="shuffle-mode-button"].active {
    background: var(--ks-accent);
    color: var(--ks-bg-deep);
    border-color: var(--ks-accent);
}

[data-testid="shuffle-mode-button"]:not(.active):hover {
    border-color: var(--ks-text-muted);
}

[x-cloak] { display: none !important; }

.ks-login-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.ks-login-form {
    background: var(--ks-bg-surface);
    border: 1px solid var(--ks-border);
    border-radius: 6px;
    padding: 2rem;
    width: 100%;
    max-width: 340px;
}

.ks-login-form h2 {
    font-size: 1.2rem;
    color: var(--ks-accent);
    margin: 0 0 1.25rem;
    text-align: center;
}

.ks-login-form input[type="text"],
.ks-login-form input[type="password"] {
    display: block;
    width: 100%;
    background: var(--ks-bg-elevated);
    border: 1px solid var(--ks-border);
    color: var(--ks-text-primary);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    margin-bottom: 0.75rem;
    outline: none;
    transition: border-color 0.2s;
}

.ks-login-form input:focus {
    border-color: var(--ks-accent);
}

.ks-login-form input.error {
    border-color: var(--ks-red);
}

.ks-login-form button[type="submit"] {
    display: block;
    width: 100%;
    background: var(--ks-accent);
    color: var(--ks-bg-deep);
    border: none;
    border-radius: 4px;
    padding: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 0.25rem;
}

.ks-login-form button[type="submit"]:hover {
    background: var(--ks-accent-hover);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-6px); }
    80% { transform: translateX(6px); }
}

.shake {
    animation: shake 0.4s ease;
}

.ks-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.ks-header-row h1 {
    margin: 0;
}

.ks-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    z-index: 203;
}

.ks-register-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 400;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ks-register-form {
    background: var(--ks-bg-surface);
    border: 1px solid var(--ks-border);
    border-radius: 6px;
    padding: 1.5rem;
    width: 100%;
    max-width: 340px;
}

.ks-register-form h3 {
    font-size: 1rem;
    color: var(--ks-accent);
    margin: 0 0 1rem;
}

.ks-register-form input[type="text"],
.ks-register-form input[type="password"],
.ks-register-form select {
    display: block;
    width: 100%;
    background: var(--ks-bg-elevated);
    border: 1px solid var(--ks-border);
    color: var(--ks-text-primary);
    border-radius: 4px;
    padding: 0.45rem 0.65rem;
    font-size: 0.85rem;
    margin-bottom: 0.6rem;
    outline: none;
}

.ks-register-form select option {
    background: var(--ks-bg-elevated);
    color: var(--ks-text-primary);
}

.ks-register-form button[type="submit"] {
    display: block;
    width: 100%;
    background: var(--ks-accent);
    color: var(--ks-bg-deep);
    border: none;
    border-radius: 4px;
    padding: 0.45rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
}

.ks-register-error {
    color: var(--ks-red);
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.ks-lesson-form {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.ks-field-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ks-text-muted);
    display: block;
    margin: 0;
    font-family: 'Noto Sans', sans-serif;
    font-weight: 600;
}

.ks-lesson-form .ks-field-label {
    margin-top: 0.5rem;
}


.ks-lesson-search-wrap {
    position: relative;
}

.ks-lesson-new-dance {
    display: flex;
    gap: 0.4rem;
    align-items: center;
}

.ks-lesson-new-dance input {
    flex: 1;
}

.ks-lesson-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    min-height: 1.5rem;
    margin: 0.25rem 0;
}

.ks-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--ks-accent-dim);
    color: var(--ks-accent);
    border-radius: 3px;
    padding: 0.2rem 0.45rem;
    font-size: 0.75rem;
}

.ks-chip-remove {
    background: none;
    border: none;
    color: var(--ks-text-secondary);
    cursor: pointer;
    padding: 0 2px;
    font-size: 0.8rem;
    line-height: 1;
}

.ks-chip-remove:hover {
    color: var(--ks-red);
}

.ks-lesson-save {
    margin-top: 0.75rem;
    padding: 0.45rem 1rem;
    width: 100%;
    height: auto;
}

.ks-lesson-save:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.ks-toast {
    position: fixed;
    bottom: calc(var(--ks-player-height) + 16px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--ks-accent);
    color: var(--ks-bg-deep);
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 500;
}

.ks-link-error {
    color: var(--ks-red);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

/* Shuffle config modal */
.ks-shuffle-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 400;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ks-shuffle-modal {
    background: var(--ks-bg-surface);
    border: 1px solid var(--ks-border);
    border-radius: 6px;
    padding: 1.5rem;
    width: 100%;
    max-width: 340px;
}

.ks-shuffle-modal h3 {
    font-size: 1rem;
    color: var(--ks-accent);
    margin: 0 0 1rem;
}

.ks-shuffle-section {
    margin-bottom: 0.75rem;
}

.ks-shuffle-section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 0.35rem;
}

.ks-shuffle-quick-actions {
    display: flex;
    gap: 0.25rem;
}

.ks-shuffle-quick-actions .ks-btn {
    color: var(--ks-text-muted);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ks-shuffle-section .ks-input {
    padding: 0.45rem 0.65rem;
    font-size: 0.85rem;
}

.ks-shuffle-lessons-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.ks-shuffle-lessons-field {
    flex: 1;
}

.ks-shuffle-lessons-field .ks-field-label {
    margin-bottom: 0.35rem;
}

.ks-shuffle-lessons-field .ks-input {
    padding: 0.45rem 0.65rem;
    font-size: 0.85rem;
}

.ks-shuffle-confirm {
    display: block;
    width: 100%;
    height: auto;
    padding: 0.45rem 1rem;
    margin-top: 0.5rem;
}

[data-testid="shuffle-config-button"] {
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .ks-shuffle-modal {
        max-width: 100%;
        margin: 0 1rem;
    }
}