/* ChessElementa Base Layout CSS */
/* Mobile-first responsive design */

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-ui, 'Outfit', sans-serif);
    min-height: 100vh;
    min-height: 100dvh;
    background: var(--body-bg);
    background-size: var(--body-bg-size);
    color: var(--text-main);
    overflow-x: hidden;
}

.container {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* ===== Sidebar Overlay (Mobile) ===== */
.sidebar-overlay {
    position: fixed;
    top: var(--header-height-mobile);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    z-index: var(--z-overlay);
    backdrop-filter: blur(4px);
}

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

/* ===== Header ===== */
header {
    position: sticky;
    top: 0;
    height: var(--header-height-mobile);
    padding: 0 var(--gap-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--header-bg);
    border-bottom: var(--header-border);
    z-index: var(--z-header);
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--gap-md);
}

.hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: var(--btn-radius);
    transition: background var(--transition-fast);
}

.hamburger-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger-btn span {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text-main);
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger-btn.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.logo {
    display: none;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.header-logo {
    display: block;
    /* Hidden on mobile - ERASED */
    height: 45px;
    width: auto;
    flex-shrink: 0;
    filter: var(--header-logo-filter, none);
    transition: filter var(--transition-fast);
}

.header-center {
    flex: 1;
    text-align: center;
    min-width: 0;
    padding: 0 var(--gap-sm);
}

#level-name-container {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#level-name {
    font-size: 1.2rem;
    font-weight: 700;
    /* font-family: 'Noto Sans SC', 'Source Han Sans SC', serif; */
    color: var(--level-title-color, var(--text-secondary));
}

.header-message {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-right {
    display: flex;
    align-items: center;
}

/* ===== Help Button ===== */
.help-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--help-btn-bg, rgba(255, 255, 255, 0.1));
    border: var(--help-btn-border, 1px solid rgba(255, 255, 255, 0.2));
    cursor: pointer;
    transition: all var(--transition-fast);
}

.help-btn:hover {
    background: var(--help-btn-hover-bg, rgba(255, 255, 255, 0.2));
    transform: scale(1.05);
}

.help-icon {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--help-btn-color, var(--text-secondary));
    line-height: 1;
}

/* ===== Modal Overlay ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    padding: var(--gap-lg);
}

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

/* ===== Modal Content ===== */
.modal-content {
    background: var(--modal-bg, var(--panel-bg-solid));
    border: var(--modal-border, var(--panel-border));
    border-radius: var(--panel-radius);
    box-shadow: var(--modal-shadow, 0 20px 60px rgba(0, 0, 0, 0.5));
    max-width: 480px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-logo {
    display: flex;
    justify-content: center;
    padding: var(--gap-lg) var(--gap-xl) 0;
}

.about-logo {
    width: 100px;
    height: auto;
    /* filter: var(--header-logo-filter, none); */
}

.modal-header {
    padding: var(--gap-lg) var(--gap-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-header h2 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--modal-title-color, var(--level-title-color));
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.version-tag {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: normal;
}

.modal-body {
    padding: var(--gap-lg) var(--gap-xl);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.modal-body p {
    margin: 0 0 var(--gap-md) 0;
}

.modal-section {
    margin-top: var(--gap-lg);
    padding-top: var(--gap-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.modal-section h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: var(--gap-sm);
    text-transform: none;
    letter-spacing: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.modal-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.modal-links li {
    margin-bottom: var(--gap-sm);
}

.modal-links a {
    color: var(--modal-link-color, var(--primary-color));
    text-decoration: none;
    transition: color var(--transition-fast);
}

.modal-links a:hover {
    color: var(--modal-link-hover, var(--secondary-color));
    text-decoration: underline;
}

/* Toggle Row (for settings in modals) */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--gap-sm) 0;
    margin: var(--gap-sm) 0;
}

.toggle-row span {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--btn-disabled-bg, rgba(255, 255, 255, 0.1));
    border-radius: 26px;
    transition: background var(--transition-fast);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

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

.toggle-switch input:checked+.toggle-slider:before {
    transform: translateX(22px);
    background: white;
}

.modal-license {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.copyright-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    flex-wrap: wrap;
}

.studio-logo {
    height: 1.4em;
    width: auto;
    opacity: 0.8;
    filter: grayscale(0.5);
    transition: all var(--transition-fast);
}

.studio-logo:hover {
    opacity: 1;
    filter: none;
}

.modal-footer {
    padding: var(--gap-md) var(--gap-xl) var(--gap-lg);
    display: flex;
    justify-content: center;
}

.modal-btn {
    min-width: 120px;
}

/* ===== Pieces Modal ===== */
.pieces-modal-content {
    max-width: 700px;
    max-height: 85vh;
}

.pieces-modal-body {
    padding: var(--gap-md) var(--gap-lg);
    overflow-y: auto;
    max-height: 60vh;
}

.modal-close-x {
    position: absolute;
    top: var(--gap-md);
    right: var(--gap-md);
    background: transparent;
    border: none;
    font-size: 1.8rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 10px;
    line-height: 1;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.modal-close-x:hover {
    color: var(--text-main);
    transform: scale(1.1);
}

.modal-header {
    position: relative;
}

/* Pieces Table */
.pieces-ref-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.pieces-ref-table th,
.pieces-ref-table td {
    padding: var(--gap-sm) var(--gap-md);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    vertical-align: middle;
}

.pieces-ref-table th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(0, 0, 0, 0.2);
    position: sticky;
    top: 0;
    z-index: 1;
}

.pieces-ref-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* Piece Preview Cell */
.piece-preview {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
}

.piece-preview-symbol {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-chinese);
    font-size: 16px;
    flex-shrink: 0;
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.35),
        inset 0 -2px 3px rgba(0, 0, 0, 0.35),
        inset 0 1px 2px rgba(255, 255, 255, 0.25);
    border: 2px solid;
}

.piece-preview-symbol.red {
    background: var(--red-piece-bg);
    border-color: var(--red-piece-border);
    color: var(--red-piece-text);
    text-shadow: var(--red-piece-shadow);
}

.piece-preview-symbol.black {
    background: var(--black-piece-bg);
    border-color: var(--black-piece-border);
    color: var(--black-piece-text);
    text-shadow: var(--black-piece-shadow);
}

.piece-preview-name {
    font-size: 0.95rem;
    color: var(--text-main);
    font-weight: 500;
}

.piece-description {
    color: var(--text-secondary);
    line-height: 1.4;
}

.piece-recipe {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.piece-recipe-formula {
    color: var(--primary-color);
    font-family: var(--font-chinese);
}

/* Section headers in table */
.pieces-ref-table .section-header td {
    background: rgba(var(--primary-color-rgb, 74, 144, 226), 0.15);
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.85rem;
    padding: var(--gap-sm) var(--gap-md);
    border-bottom: 2px solid var(--primary-color);
}

.header-moves {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--gap-xs) var(--gap-sm);
}

.moves-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.moves-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

/* Header moves - hidden on mobile game mode, shown on desktop */
.header-moves {
    display: none;
}

/* ===== Mobile Game Status Area ===== */
.mobile-game-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--gap-sm) var(--gap-md);
    text-align: center;
    margin-top: 20px;
    margin-bottom: 40px;
}

.mobile-moves-display {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mobile-moves-label {
    font-size: 1.0rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mobile-moves-number {
    font-size: 7rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.mobile-status-message {
    font-size: 0.8rem;
    color: var(--text-muted);
    min-height: 1.2em;
    margin-top: var(--gap-xs);
}

/* ===== Main Game Container ===== */
.game-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ===== Sidebars ===== */
.sidebar {
    position: fixed;
    top: var(--header-height-mobile);
    /* Start below header */
    bottom: 0;
    width: var(--sidebar-width-mobile);
    background: var(--panel-bg);
    backdrop-filter: var(--panel-blur);
    -webkit-backdrop-filter: var(--panel-blur);
    border: var(--panel-border);
    box-shadow: var(--panel-shadow);
    z-index: var(--z-sidebar);
    transform: translateX(-100%);
    transition: transform var(--transition-normal) ease;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-left {
    left: 0;
    border-left: none;
    border-top: none;
    border-bottom: none;
}

.sidebar-right {
    right: 0;
    transform: translateX(100%);
    border-right: none;
    border-top: none;
    border-bottom: none;
}

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

.sidebar-content {
    padding: var(--gap-lg);
    /* No longer need extra padding for header since sidebar starts below */
}

.sidebar-section {
    margin-bottom: var(--gap-xl);
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-divider {
    padding-bottom: var(--gap-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-bottom {
    margin-top: auto;
    padding-top: var(--gap-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.settings-row {
    display: flex;
    align-items: center;
    gap: var(--gap-md);
    margin-bottom: var(--gap-md);
}

.settings-row label {
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.settings-row .level-select {
    flex: 1;
    margin: 0;
}

/* ===== Board Container ===== */
.board-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    /* Align to top for better mobile layout */
    padding: var(--gap-md);
    padding-bottom: calc(var(--bottom-bar-height) + var(--gap-md));
    overflow: auto;
}

/* Mobile editor mode: right panel shows below board */
.mobile-editor-panel {
    display: none;
    width: 100%;
    padding: var(--gap-md);
    background: var(--panel-bg);
    backdrop-filter: var(--panel-blur);
    border-top: var(--panel-border);
}

body.mobile-editor-mode .mobile-editor-panel {
    display: block;
}

body.mobile-editor-mode .mobile-bottom-bar {
    display: none;
}

body.mobile-editor-mode .board-container {
    padding-bottom: var(--gap-md);
    justify-content: flex-start;
}

/* ===== Game Board ===== */
#game-board {
    display: inline-grid;
    gap: var(--cell-gap);
    padding: var(--board-padding-mobile);
    border-radius: 8px;
    background: var(--board-bg);
    backdrop-filter: var(--board-blur);
    border: var(--board-border);
    box-shadow: var(--board-shadow);
    max-width: 100%;
}

.cell {
    width: var(--cell-size-computed, var(--cell-size-mobile));
    height: var(--cell-size-computed, var(--cell-size-mobile));
    border-radius: var(--cell-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    cursor: pointer;
    position: relative;
    background: var(--cell-bg);
    border: var(--cell-border);
    transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.cell:hover {
    background: var(--cell-hover-bg);
    border-color: var(--cell-hover-border);
}

.cell.selected {
    background: var(--cell-selected-bg);
    border: 1px solid var(--cell-selected-border);
    box-shadow: var(--cell-selected-shadow);
}

.cell.valid-move {
    background: var(--cell-valid-bg);
}

.cell.valid-move.has-piece {
    box-shadow: var(--capture-cell-shadow);
    border: 1px solid var(--capture-cell-border);
}

/* ===== Mobile Bottom Bar ===== */
.mobile-bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-bar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--gap-lg);
    background: var(--bottom-bar-bg);
    border-top: var(--bottom-bar-border);
    z-index: var(--z-bottom-bar);
}

.bottom-bar-left,
.bottom-bar-center,
.bottom-bar-right {
    display: flex;
    gap: var(--gap-sm);
}

.bottom-bar-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.bottom-btn {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bottom-btn-bg);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--btn-radius);
    cursor: pointer;
    transition: background var(--transition-fast);
}

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

.bottom-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.5rem;
    color: var(--level-title-color, var(--text-secondary));
    line-height: 1;
}

/* ===== Section Headers ===== */
h3 {
    margin-bottom: var(--gap-md);
    padding-bottom: var(--gap-sm);
    font-weight: 500;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===== Buttons ===== */
.btn {
    display: block;
    width: 100%;
    padding: 10px 16px;
    margin: var(--gap-sm) 0;
    border-radius: var(--btn-radius);
    cursor: pointer;
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.9rem;
    text-align: center;
    background: var(--btn-bg);
    color: var(--btn-text);
    border: var(--btn-border);
    box-shadow: var(--btn-shadow);
    transition: all var(--transition-fast);
}

.btn:hover {
    background: var(--btn-hover-bg);
    box-shadow: var(--btn-hover-shadow);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    background: var(--btn-disabled-bg);
    color: var(--btn-disabled-text);
    border: var(--btn-disabled-border);
    box-shadow: none;
    transform: none;
    cursor: not-allowed;
}

.btn-row {
    display: flex;
    gap: var(--gap-sm);
}

.btn-half {
    flex: 1;
}

.btn-save {
    margin-top: var(--gap-lg);
}

/* ===== Select & Inputs ===== */
.level-select {
    width: 100%;
    padding: 10px 12px;
    margin: var(--gap-sm) 0;
    border-radius: var(--btn-radius);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    background: var(--input-bg);
    border: var(--input-border);
    color: var(--text-main);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.level-select:focus {
    border-color: var(--input-focus-border);
    background: var(--input-focus-bg);
}

.level-select option {
    background: var(--input-option-bg);
    color: var(--text-main);
}

.editor-input-group {
    margin-bottom: var(--gap-md);
}

.editor-input-group label {
    font-size: 0.8rem;
    margin-bottom: 4px;
    display: block;
    color: var(--text-muted);
}

.editor-input-group input,
.editor-input-group select,
.editor-input-group textarea {
    width: 100%;
    padding: 8px 10px;
    border-radius: 6px;
    background: var(--input-bg);
    border: var(--input-border);
    color: var(--text-main);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.editor-input-group input:focus,
.editor-input-group textarea:focus {
    border-color: var(--input-focus-border);
    background: var(--input-focus-bg);
    outline: none;
}

/* ===== Status Section ===== */
.status-section {
    text-align: center;
}

.status-section p {
    margin: var(--gap-sm) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.move-counter-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--gap-md) 0;
}

.big-move-number {
    font-size: 5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--primary-color);
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.multi-move-info {
    color: var(--secondary-color);
}

/* ===== Game Over States ===== */
.game-won {
    font-family: var(--font-chinese) !important;
    color: var(--win-color, #22c55e) !important;
    text-shadow:
        0 0 5px color-mix(in srgb, var(--win-color) 70%, black),
        0 4px 3px rgba(0, 0, 0, 0.4) !important;
}

.game-lost {
    font-family: var(--font-chinese) !important;
    color: var(--lose-color, #ef4444) !important;
    text-shadow:
        0 0 5px color-mix(in srgb, var(--lose-color) 70%, black),
        0 4px 3px rgba(0, 0, 0, 0.4) !important;
}

/* Win button highlight - green glow */
.btn-win-highlight,
.bottom-btn.btn-win-highlight {
    background: var(--btn-win-bg, linear-gradient(135deg, rgba(34, 197, 94, 0.9) 0%, rgba(22, 163, 74, 1) 100%)) !important;
    border-color: var(--win-color, #22c55e) !important;
    box-shadow: var(--btn-win-shadow, 0 0 20px rgba(34, 197, 94, 0.6), 0 0 40px rgba(34, 197, 94, 0.3)) !important;
}

/* Lose button highlight - red glow */
.btn-lose-highlight,
.bottom-btn.btn-lose-highlight {
    background: var(--btn-lose-bg, linear-gradient(135deg, rgba(239, 68, 68, 0.9) 0%, rgba(220, 38, 38, 1) 100%)) !important;
    border-color: var(--lose-color, #ef4444) !important;
    box-shadow: var(--btn-lose-shadow, 0 0 20px rgba(239, 68, 68, 0.6), 0 0 40px rgba(239, 68, 68, 0.3)) !important;
}

/* ===== Status Messages ===== */
.status-messages {
    margin-top: var(--gap-md);
    min-height: 32px;
    padding: var(--gap-sm) var(--gap-md);
    border-radius: 6px;
    font-size: 0.85rem;
    text-align: center;
}

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

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

.status-messages.info {
    background: var(--status-info-bg);
    color: var(--status-info-text);
    border: 1px solid var(--status-info-border);
}

/* ===== History ===== */
#move-history {
    padding: var(--gap-sm);
    border-radius: 6px;
    background: var(--history-bg);
    border: var(--history-border);
    color: var(--text-muted);
    font-size: 0.85rem;
    max-height: 150px;
    overflow-y: auto;
}

.history-item {
    padding: 3px 6px;
    border-bottom: var(--history-item-border);
    color: var(--text-secondary);
}

.history-item:last-child {
    border-bottom: none;
}

.history-item.current {
    background: var(--history-current-bg);
    border-left: 3px solid var(--primary-color);
    padding-left: 8px;
    color: var(--text-main);
}

/* ===== Terrain ===== */
.cell.wall {
    position: relative;
    color: transparent !important;
    font-size: 0 !important;
    background: var(--wall-bg);
    border: var(--wall-border);
}

.cell.river {
    background: var(--river-bg);
    border: var(--river-border);
}

.cell.river::before {
    content: "≋";
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 32px;
    font-weight: normal;
    font-family: serif;
    color: var(--river-symbol-color);
    line-height: 1;
    z-index: var(--z-terrain);
    pointer-events: none;
}

.cell.river.vertical::before {
    transform: translate(-37%, -40%) rotate(90deg);
}

/* Hide dynamically added river symbol spans */
.river-symbol {
    display: none !important;
}

.cell.pit {
    background: transparent;
    border: none;
    box-shadow: none;
}

.cell.pit::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--pit-gradient);
    border-radius: 50%;
    z-index: 0;
    transform: scale(0.85);
}

/* ===== Pieces ===== */
.piece,
.element,
.bench-item .piece-symbol,
.bench-item .element-symbol {
    font-family: var(--font-chinese);
    z-index: var(--z-piece);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: var(--piece-size-computed, 48px);
    height: var(--piece-size-computed, 48px);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform var(--transition-fast);
}

.piece,
.bench-item .piece-symbol {
    border-radius: 50%;
    box-shadow:
        0 3px 6px rgba(0, 0, 0, 0.35),
        inset 0 -3px 4px rgba(0, 0, 0, 0.35),
        inset 0 2px 3px rgba(255, 255, 255, 0.25);
    border: 3px solid;
}

.bench-item .piece-symbol {
    transform: translate(-50%, -50%) scale(0.55);
}

.piece.red,
.bench-item .piece-symbol.red {
    background: var(--red-piece-bg);
    border-color: var(--red-piece-border);
    color: var(--red-piece-text);
    text-shadow: var(--red-piece-shadow);
}

.piece.red:hover {
    transform: translate(-50%, -50%) scale(1.08);
    z-index: var(--z-hover);
    filter: brightness(1.05);
}

.piece.black,
.bench-item .piece-symbol.black {
    background: var(--black-piece-bg);
    border-color: var(--black-piece-border);
    color: var(--black-piece-text);
    text-shadow: var(--black-piece-shadow);
}

.element,
.bench-item .element-symbol {
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.4));
}

.element {
    color: var(--element-color);
    filter: drop-shadow(0 0 8px var(--element-glow));
    animation: float 3s ease-in-out infinite;
}

.piece-text,
.bench-item .piece-symbol .piece-text {
    z-index: var(--z-piece-text);
    position: relative;
    color: inherit;
    font-size: 26px;
    line-height: 1;
    pointer-events: none;
}

.piece.combined .piece-text {
    font-size: 20px;
    letter-spacing: var(--combined-piece-letter-spacing, -2px);
}

/* ===== Move Indicators ===== */
.move-indicator {
    width: 12px;
    height: 12px;
    background: var(--move-indicator-bg);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: var(--move-indicator-shadow);
    z-index: var(--z-indicator);
    pointer-events: none;
}

.move-indicator.capture {
    background: var(--capture-indicator-bg);
    box-shadow: var(--capture-indicator-shadow);
    width: 14px;
    height: 14px;
}

/* ===== Editor Tools ===== */
.tool-buttons {
    display: flex;
    gap: var(--gap-sm);
}

.tool-btn {
    flex: 1;
    padding: var(--gap-sm);
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    font-size: 0.85rem;
    background: var(--tool-btn-bg);
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all var(--transition-fast);
}

.tool-btn:hover {
    background: var(--tool-btn-hover-bg);
    color: var(--text-main);
}

.tool-btn.active {
    background: var(--tool-btn-active-bg);
    color: var(--text-main);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: var(--tool-btn-active-shadow);
}

.bench-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-sm);
}

.bench-item {
    padding: var(--gap-sm) 4px;
    border-radius: var(--btn-radius);
    text-align: center;
    cursor: pointer;
    position: relative;
    height: 75px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    background: var(--bench-item-bg);
    color: var(--text-main);
    border: 1px solid transparent;
    transition: all var(--transition-fast);
}

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

.bench-item.selected {
    border: 2px solid var(--bench-item-selected-border);
    background: var(--bench-item-selected-bg);
    box-shadow: var(--bench-item-selected-shadow);
}

.bench-label {
    margin-top: 4px;
    font-size: 0.7rem;
    display: block;
    z-index: var(--z-piece-text);
    color: var(--text-muted);
}

.terrain-symbol {
    font-size: 24px;
    line-height: 1;
}

.color-selector {
    margin-bottom: var(--gap-md);
}

.color-selector .btn {
    width: 100%;
    background: #ef4444;
    color: white;
    margin: 0;
}

/* ===== Mode Toggle ===== */
.mode-toggle {
    /* background: var(--mode-toggle-bg);
    border: var(--mode-toggle-border); */
}

.mode-toggle.editor-active {
    background: var(--mode-toggle-active-bg);
    color: var(--mode-toggle-active-text);
    border-color: var(--mode-toggle-active-border);
}

/* ===== Editor Hint ===== */
.editor-hint {
    margin-top: var(--gap-md);
    padding: var(--gap-sm) var(--gap-md);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 6px;
}

.game-hint {
    margin-top: var(--gap-md);
    padding: var(--gap-sm) var(--gap-md);
    font-size: 1.0rem;
    color: var(--level-title-color);
    text-align: center;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 20px;
}

/* ===== Ability Arrows ===== */
.ability-arrow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
    height: 50%;
    pointer-events: none;
    z-index: var(--z-piece-text);
    opacity: 0.6;
    filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.5));
    animation: pulseArrow 1.5s infinite alternate;
}

.arrow-up {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M12 2l-10 10h6v10h8v-10h6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.arrow-down {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M12 22l10-10h-6v-10h-8v10h-6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.arrow-left {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M2 12l10 10v-6h10v-8h-10v-6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.arrow-right {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M22 12l-10-10v6h-10v8h10v6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.cell.ability-attack-range,
.cell.area-damage-preview {
    background-color: var(--area-damage-bg);
}

/* ===== Animations ===== */
@keyframes pulseArrow {
    from {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.6;
    }

    to {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.9;
    }
}

@keyframes float {

    0%,
    100% {
        transform: translate(-50%, -50%) translateY(0);
    }

    50% {
        transform: translate(-50%, -50%) translateY(-3px);
    }
}

@keyframes shake {

    10%,
    90% {
        transform: translate3d(-1px, 0, 0);
    }

    20%,
    80% {
        transform: translate3d(2px, 0, 0);
    }

    30%,
    50%,
    70% {
        transform: translate3d(-4px, 0, 0);
    }

    40%,
    60% {
        transform: translate3d(4px, 0, 0);
    }
}

@keyframes flashRed {
    0% {
        background-color: rgba(255, 0, 0, 0.5);
    }

    100% {
        background-color: transparent;
    }
}

@keyframes flashBlue {
    0% {
        background-color: rgba(0, 229, 255, 0.5);
    }

    100% {
        background-color: transparent;
    }
}

.cell.flash-red {
    animation: flashRed 0.5s ease-out;
}

.cell.flash-blue {
    animation: flashBlue 0.5s ease-out;
}

.occupied-warning {
    animation: shake 0.3s cubic-bezier(.36, .07, .19, .97) both;
    background-color: rgba(255, 0, 0, 0.2) !important;
}

/* AI Glow Effects */
.ai-glow::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background: conic-gradient(from 0deg,
            transparent 0%,
            transparent 65%,
            rgba(255, 100, 50, 0.1) 72%,
            rgba(255, 70, 30, 0.2) 78%,
            rgba(255, 50, 10, 0.35) 84%,
            rgba(255, 30, 0, 0.55) 90%,
            rgba(255, 10, 0, 0.75) 95%,
            #ff0000 100%);
    -webkit-mask: radial-gradient(farthest-side, transparent 78%, #fff 80%, #fff 92%, transparent 94%);
    mask: radial-gradient(farthest-side, transparent 78%, #fff 80%, #fff 92%, transparent 94%);
    animation: ai-orbit 2s linear infinite;
    pointer-events: none;
    z-index: var(--z-piece);
}

.ai-glow::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background: radial-gradient(circle at 50% 6px, #ff0000 0%, #ff0000 3px, transparent 4px, transparent 100%);
    filter: drop-shadow(0 0 5px #ff0000) drop-shadow(0 0 10px #ff0000);
    animation: ai-orbit 2s linear infinite;
    pointer-events: none;
    z-index: 11;
}

@keyframes ai-orbit {
    0% {
        transform: translate(-50%, -50%) rotate(0deg);
    }

    100% {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* ===== Utility Classes ===== */
.cursor-crosshair {
    cursor: crosshair !important;
}

.cursor-move {
    cursor: move !important;
}

.cursor-not-allowed {
    cursor: not-allowed !important;
}

.cursor-crosshair .cell,
.cursor-move .cell,
.cursor-not-allowed .cell {
    cursor: inherit !important;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* ===== Mobile-Specific Fixes ===== */
/* AI Glow Mobile Alignment - reduce pseudo-element size to match smaller pieces */
@media (max-width: 767px) {

    .ai-glow::after,
    .ai-glow::before {
        width: 150%;
        height: 150%;
    }

    /* Adjust dot position for smaller mobile pieces - use percentage instead of fixed 6px */
    .ai-glow::before {
        background: radial-gradient(circle at 50% 8%, #ff0000 0%, #ff0000 3px, transparent 4px, transparent 100%);
    }

    /* Combined piece text - prevent vertical stacking on mobile */
    .piece.combined .piece-text {
        font-size: 16px;
        white-space: nowrap;
    }

    /* Mobile Header Center Alignment */
    .header-center {
        position: absolute;
        left: 0;
        right: 0;
        text-align: center;
        pointer-events: none;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100%;
    }

    .header-center>* {
        pointer-events: auto;
    }
}

/* ============================================
   TABLET & DESKTOP RESPONSIVE STYLES
   ============================================ */

@media (min-width: 768px) {

    /* Hide mobile-only elements */
    .hamburger-btn {
        display: none;
    }

    .mobile-bottom-bar {
        display: none;
    }

    .sidebar-overlay {
        display: none;
    }

    .mobile-game-status {
        display: none;
    }

    .mobile-editor-panel {
        display: none !important;
    }

    /* Show header moves on desktop */
    .header-moves {
        display: flex;
    }

    /* Header adjustments */
    header {
        height: var(--header-height);
        padding: 0 var(--gap-xl);
    }

    .logo {
        display: block;
        font-size: 1.5rem;
    }

    .header-logo {
        display: block;
    }

    #level-name {
        font-size: 1.2rem;
    }

    /* Center level title relative to the board (accounting for sidebars + gaps) */
    .header-center {
        position: absolute;
        left: calc(var(--sidebar-width) + var(--gap-lg));
        right: calc(var(--sidebar-width) + var(--gap-lg));
        text-align: center;
        pointer-events: none;
    }

    .header-center #level-name-container {
        pointer-events: auto;
    }

    .header-message {
        font-size: 0.85rem;
        margin-right: 60px;
    }

    .moves-number {
        font-size: 2rem;
    }

    /* Main layout: 3-column grid */
    .game-container {
        display: grid;
        grid-template-columns: var(--sidebar-width) 1fr var(--sidebar-width);
        gap: var(--gap-lg);
        padding: var(--gap-lg);
        overflow: visible;
    }

    /* Sidebars visible as static panels */
    .sidebar {
        position: static;
        transform: none;
        width: auto;
        height: fit-content;
        /* Auto-height based on content */
        max-height: calc(100vh - var(--header-height) - var(--gap-lg) * 2);
        overflow-y: auto;
        border-radius: var(--panel-radius);
    }

    .sidebar-content {
        padding: var(--gap-lg);
        padding-top: var(--gap-lg);
    }

    .sidebar-left {
        border: var(--panel-border);
    }

    .sidebar-right {
        border: var(--panel-border);
    }

    /* Board container */
    .board-container {
        padding: 0;
        padding-bottom: 0;
    }

    /* Larger cells on desktop - increased for high-DPI screens */
    .cell {
        width: var(--cell-size-computed, 80px);
        height: var(--cell-size-computed, 80px);
        font-size: 36px;
    }

    #game-board {
        padding: var(--board-padding);
        border-radius: 12px;
    }

    .cell.river::before {
        font-size: 38px;
    }

    /* Larger pieces */
    .piece,
    .element,
    .bench-item .piece-symbol,
    .bench-item .element-symbol {
        width: var(--piece-size-computed, 64px);
        height: var(--piece-size-computed, 64px);
    }

    .piece-text,
    .bench-item .piece-symbol .piece-text {
        font-size: 30px;
    }

    .piece.combined .piece-text {
        font-size: 22px;
    }

    .bench-item .piece-symbol {
        transform: translate(-50%, -50%) scale(0.5);
    }

    /* Larger big move number */
    .big-move-number {
        font-size: 6rem;
    }

    /* Editor bench items */
    .bench-item {
        height: 85px;
    }

    .bench-label {
        font-size: 0.75rem;
    }

    /* Move indicators */
    .move-indicator {
        width: 14px;
        height: 14px;
    }

    .move-indicator.capture {
        width: 16px;
        height: 16px;
    }
}

/* Large desktop */
@media (min-width: 1200px) {
    .game-container {
        gap: var(--gap-xl);
        padding: var(--gap-xl);
    }

    .sidebar {
        max-height: calc(100vh - var(--header-height) - var(--gap-xl) * 2);
    }

    .cell {
        width: 70px;
        height: 70px;
        font-size: 36px;
    }

    .piece,
    .element {
        width: 60px;
        height: 60px;
    }

    .piece-text {
        font-size: 32px;
    }

    .piece.combined .piece-text {
        font-size: 24px;
    }

    .cell.river::before {
        font-size: 42px;
    }
}

/* ============================================
   SPLASH SCREEN STYLES
   (Consolidated from splash.css)
   ============================================ */

/* ===== Main Overlay ===== */
.splash-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: all;
    /* Transparent so we can see what's behind when curtains open */
    background: transparent;
}

/* ===== Curtain Panels ===== */
.curtain-left,
.curtain-right {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    z-index: 2;
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.curtain-left {
    left: 0;
    background: linear-gradient(90deg, rgba(15, 15, 35, 1) 0%, rgba(26, 26, 62, 1) 100%);
}

.curtain-right {
    right: 0;
    background: linear-gradient(-90deg, rgba(15, 15, 35, 1) 0%, rgba(26, 26, 62, 1) 100%);
}

.theme-wood .curtain-left {
    background: linear-gradient(90deg, rgba(28, 15, 10, 1) 0%, rgba(61, 40, 23, 1) 100%);
}

.theme-wood .curtain-right {
    background: linear-gradient(-90deg, rgba(28, 15, 10, 1) 0%, rgba(61, 40, 23, 1) 100%);
}

.theme-ink .curtain-left {
    background: linear-gradient(90deg, #1a1a1a 0%, #2d2d2d 100%);
}

.theme-ink .curtain-right {
    background: linear-gradient(-90deg, #1a1a1a 0%, #2d2d2d 100%);
}

/* Curtain open animation */
.splash-ready .curtain-left {
    transform: translateX(-100%);
}

.splash-ready .curtain-right {
    transform: translateX(100%);
}

/* ===== Splash Content Container ===== */
.splash-content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    opacity: 0;
    animation: splash-fade-in 0.6s ease-out 0.1s forwards;
    /* Ensure content stays on top of curtains */
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.5));
}

@keyframes splash-fade-in {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.splash-ready .splash-content {
    animation: splash-fade-out 0.4s ease-in forwards;
}

@keyframes splash-fade-out {
    to {
        opacity: 0;
        transform: scale(0.95);
    }
}

/* ===== Logo Container ===== */
.splash-logo-container {
    position: relative;
    width: 160px;
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 800px;
}

/* ===== Logo Image ===== */
.splash-logo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    /* Only 3D rotation */
    animation: logo-rotate 1.5s linear infinite;
    filter: drop-shadow(0 0 20px rgba(139, 92, 246, 0.5));
    transform-style: preserve-3d;
}

.theme-wood .splash-logo {
    filter: drop-shadow(0 0 20px rgba(245, 158, 11, 0.5));
}

@keyframes logo-rotate {
    from {
        transform: rotateY(0deg);
    }

    to {
        transform: rotateY(360deg);
    }
}

/* ===== Progress Ring ===== */
.splash-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    pointer-events: none;
}

.splash-ring .ring-bg {
    cx: 60;
    cy: 60;
    r: 54;
    fill: none;
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 3;
}

.splash-ring .ring-progress {
    cx: 60;
    cy: 60;
    r: 54;
    fill: none;
    stroke: url(#ring-gradient);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    /* 2.5s duration */
    animation: ring-fill 4s cubic-bezier(0.2, 0.6, 0.35, 1) forwards;
    /* Glow effect */
    filter: drop-shadow(0 0 4px currentColor);
}

/* Fallback stroke color */
.theme-glass .splash-ring .ring-progress,
.splash-ring .ring-progress {
    stroke: #8b5cf6;
    color: #8b5cf6;
    /* for currentColor */
}

.theme-wood .splash-ring .ring-progress {
    stroke: #f59e0b;
    color: #f59e0b;
    /* for currentColor */
}

@keyframes ring-fill {
    to {
        stroke-dashoffset: 0;
    }
}

/* ===== Status Text ===== */
.splash-status {
    font-family: var(--font-ui, 'Outfit', sans-serif);
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    letter-spacing: 2px;
    text-transform: uppercase;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    animation: status-pulse 1.5s ease-in-out infinite;
}

.theme-wood .splash-status {
    color: rgba(254, 243, 199, 0.6);
}

@keyframes status-pulse {

    0%,
    100% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }
}

/* ===== Splash Mobile Responsive ===== */
@media (max-width: 768px) {
    .splash-logo-container {
        width: 140px;
        height: 140px;
    }

    .splash-logo {
        width: 100px;
        height: 100px;
    }

    .splash-status {
        font-size: 12px;
    }
}

/* ===== Splash Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {

    .splash-logo,
    .splash-ring .ring-progress {
        animation: none;
    }

    .splash-logo {
        transform: none;
    }

    .splash-ring .ring-progress {
        stroke-dashoffset: 0;
    }
}

/* ============================================
   LEVEL SELECTOR MODAL STYLES
   (Consolidated from level_selector.css)
   ============================================ */

/* Modal Overlay */
.level-selector-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.level-selector-overlay.active {
    display: flex;
}

/* Modal Container */
.level-selector-modal {
    background: var(--panel-bg-solid);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    height: 90vh;
    max-height: 950px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--panel-shadow);
    border: var(--panel-border);
    overflow: hidden;
}

/* Modal Header */
.level-selector-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: var(--panel-border);
    background: var(--panel-bg);
}

.level-selector-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-main);
    font-weight: 500;
}

.level-selector-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.level-selector-close:hover {
    color: var(--text-main);
    background: var(--tool-btn-hover-bg);
}

/* Tab Navigation */
.level-selector-tabs {
    display: flex;
    border-bottom: var(--panel-border);
    background: var(--panel-bg);
}

.level-tab {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

.level-tab:hover {
    color: var(--text-main);
    background: var(--tool-btn-hover-bg);
}

.level-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--panel-bg-solid);
}

/* Level List Container */
.level-selector-content {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

/* Category Groups */
.level-category {
    margin-bottom: 16px;
}

.level-category-header {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    background: var(--tool-btn-bg);
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 8px;
    transition: all 0.2s;
}

.level-category-header:hover {
    background: var(--tool-btn-hover-bg);
}

.level-category-header .category-icon {
    margin-right: 8px;
    transition: transform 0.2s;
}

.level-category-header.collapsed .category-icon {
    transform: rotate(-90deg);
}

.level-category-header .category-name {
    flex: 1;
    font-weight: 500;
    color: var(--text-main);
}

.level-category-header .category-count {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Level Items */
.level-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-left: 12px;
}

.level-category.collapsed .level-items {
    display: none;
}

.level-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    background: var(--bench-item-bg);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.level-item:hover {
    background: var(--bench-item-hover-bg);
    border-color: var(--text-dim);
}

.level-item.selected {
    border-color: var(--primary-color);
    background: var(--bench-item-selected-bg);
}

.level-item .level-name {
    flex: 1;
    color: var(--text-main);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
}

/* Two-column layout for official levels */
.level-item .level-number {
    width: 32px;
    flex-shrink: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: left;
}

.level-item .level-title {
    flex: 1;
    text-align: center;
    color: var(--text-main);
}

/* Completion star for finished levels */
.level-item .level-complete-star {
    color: var(--text-main);
    font-size: 1rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

/* Locked level styling */
.level-item.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.level-item.locked:hover {
    background: var(--bench-item-bg);
    border-color: transparent;
}

.level-item .level-lock-icon {
    color: var(--text-muted);
    font-size: 0.9rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

/* Custom level layout */
.level-item .level-author {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-right: 8px;
}

.level-item .level-meta {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Custom Level Actions */
.level-item .level-actions {
    display: flex;
    gap: 8px;
    margin-left: 8px;
}

.level-action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.level-action-btn:hover {
    color: var(--text-main);
    background: var(--tool-btn-bg);
}

.level-action-btn.delete:hover {
    color: #ef4444;
}

/* Empty State */
.level-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.level-empty p {
    margin: 8px 0;
}

.level-empty .empty-icon {
    font-size: 2rem;
    margin-bottom: 8px;
    opacity: 0.5;
}

/* Modal Footer */
.level-selector-footer {
    padding: 12px 20px;
    border-top: var(--panel-border);
    background: var(--panel-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
}

.level-selector-footer .storage-info {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
}

/* Hide storage info when not on custom tab */
.level-selector-footer .storage-info.hidden {
    display: none;
}

/* Upload button in footer */
.upload-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 8px;
    margin-left: 12px;
    border-radius: 4px;
    font-size: 1.1rem;
    transition: all 0.2s;
    display: none;
    /* Hidden by default, shown when custom tab active */
}

.upload-btn:hover {
    color: var(--text-main);
    background: var(--tool-btn-hover-bg);
}

/* Upload status message */
.upload-status {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: 8px;
}

.upload-status.error {
    color: #ef4444;
}

.upload-status.success {
    color: #22c55e;
}

/* Download button in level actions */
.level-action-btn.download:hover {
    color: #22c55e;
}

.level-selector-footer .btn {
    padding: 8px 16px;
}

/* Level Select Button (replaces dropdown) */
.level-select-btn {
    width: 100%;
    padding: 8px 12px;
    background: var(--bench-item-bg);
    border: var(--input-border);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.level-select-btn:hover {
    background: var(--bench-item-hover-bg);
    border-color: var(--primary-color);
}

.level-select-btn .btn-text {
    flex: 1;
    text-align: left;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.level-select-btn .btn-icon {
    margin-left: 8px;
    font-size: 0.8rem;
}

/* Level Selector Scrollbar styling */
.level-selector-content::-webkit-scrollbar {
    width: 8px;
}

.level-selector-content::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
}

.level-selector-content::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

.level-selector-content::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Level Selector Mobile Responsive */
@media (max-width: 768px) {
    .level-selector-modal {
        width: 95%;
        max-height: 85vh;
    }

    .level-selector-header {
        padding: 12px 16px;
    }

    .level-tab {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .level-item .level-actions {
        opacity: 1;
        /* Always visible on mobile */
    }
}