/* ===================================
   CAISSA Chess - Fritz Classic Style
   =================================== */

/* ===== ROOT VARIABLES ===== */
:root {
    /* Fritz Classic Colors */
    --primary-color: #2c5f9e;
    --secondary-color: #5a8fc4;
    --accent-color: #ff9800;
    --success-color: #4caf50;
    --danger-color: #f44336;
    
    /* Board Colors - Classic Fritz */
    --light-square: #f0d9b5;
    --dark-square: #b58863;
    --board-border: #8b7355;
    
    /* UI Colors */
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #dfe6e9;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Sizes - CRITICAL FOR BOARD VISIBILITY */
    --board-size: 600px;
    --sidebar-width: 280px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
    /* Prevent horizontal overflow on mobile */
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* ===== APP CONTAINER ===== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Embed mode styles */
.app-container.embed-mode {
    background: transparent;
}

.embed-mode .header,
.embed-mode .left-sidebar,
.embed-mode .right-sidebar {
    display: none;
}

.embed-mode .main-content {
    padding: 0;
}

/* ===== HEADER ===== */
.header {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1800px;
    margin: 0 auto;
}

.app-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-controls {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

/* ===== MAIN CONTENT LAYOUT ===== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

/* ===== SIDEBARS ===== */
.left-sidebar,
.right-sidebar {
    width: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    overflow-y: auto;
    overflow-x: hidden;
    /* Ensure sidebars don't overflow container */
    min-width: 0;
    max-width: 100%;
}

.left-sidebar {
    order: 1;
}

.right-sidebar {
    order: 3;
}

/* ===== BOARD CONTAINER - CRITICAL FIX ===== */
.board-container {
    flex: 1;
    order: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 0; /* Prevents flex items from overflowing */

    /* Mobile drag stability - prevent scroll during piece drag */
    touch-action: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Board-Editor Wrapper - Ensures board and editor have matching width */
.board-editor-wrapper {
    width: 100%;
    max-width: var(--board-size); /* 600px on desktop, scales down on mobile */
    display: flex;
    flex-direction: column;
    align-items: stretch; /* Make all children same width */
    gap: var(--spacing-md);
}

/* ===== CHESSBOARD STYLES - FORCE PROPER FLOAT LAYOUT ===== */
#chessboard {
    /* RESPONSIVE: Scale with viewport on mobile, fixed on desktop */
    width: min(92vw, 600px) !important;
    height: min(92vw, 600px) !important;
    max-width: 600px !important;
    max-height: 600px !important;

    /* Visual styling */
    border: 3px solid var(--board-border);
    box-shadow: var(--shadow-lg);
    border-radius: 4px;
    box-sizing: border-box;

    /* Remove margin since wrapper centers it */
    margin: 0;
}

/* CRITICAL: The board wrapper must respect the container width */
.board-b72b1 {
    width: 100% !important;
    height: 100% !important;
    position: relative !important;
}

/* CRITICAL: Squares must be exactly 12.5% with float:left to create 8x8 grid */
.square-55d63 {
    width: 12.5% !important;
    /* CRITICAL: Use aspect-ratio to maintain square shape even when empty */
    aspect-ratio: 1 / 1 !important;
    float: left !important;
    position: relative !important;
    box-sizing: border-box !important;
}

/* Fallback for older browsers: explicit height in pixels */
@supports not (aspect-ratio: 1 / 1) {
    .square-55d63 {
        height: 75px !important; /* 600px / 8 = 75px */
    }
}

/* CRITICAL: Ensure pieces and notation don't break the square dimensions */
.piece-417db {
    max-width: 100% !important;
    max-height: 100% !important;
}

.notation-322f9 {
    position: absolute !important;
}

/* Clear floats after all 64 squares */
.board-b72b1::after {
    content: "";
    display: table;
    clear: both;
}

/* Fritz classic color scheme - customize chessboard.js colors */
.white-1e1d7 {
    background-color: var(--light-square) !important;
}

.black-3c85d {
    background-color: var(--dark-square) !important;
}

/* Highlight styles */
.highlight-white {
    box-shadow: inset 0 0 3px 3px rgba(255, 255, 0, 0.5);
}

.highlight-black {
    box-shadow: inset 0 0 3px 3px rgba(255, 255, 0, 0.5);
}

/* Notation styles */
.notation-322f9 {
    color: var(--text-secondary) !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    pointer-events: none !important;
}

/* ===== PANELS ===== */
.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-sm);
}

/* Analysis panel header: 3-column layout for [Title] [Menu] [Analyze] */
.analysis-panel .panel-header {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--spacing-sm);
    align-items: center;
}

.panel-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
    padding: var(--spacing-md);
}

/* ===== GAME STATUS PANEL ===== */
.status-content {
    padding: var(--spacing-md);
}

.turn-indicator {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    font-size: 16px;
}

.timer-display {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.timer {
    flex: 1;
    padding: var(--spacing-md);
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 18px;
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

.white-timer {
    background: #fff;
    border: 2px solid var(--border-color);
}

.black-timer {
    background: #333;
    color: #fff;
    border: 2px solid #555;
}

.game-result {
    padding: var(--spacing-md);
    text-align: center;
    font-weight: 600;
    border-radius: 4px;
    display: none;
}

.game-result.show {
    display: block;
    background: var(--accent-color);
    color: white;
}

/* ===== MOVE HISTORY ===== */
.move-history-panel {
    /* Make Move History prominent - WinBoard style */
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 350px;
    max-height: 450px;
}

.history-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.move-history-content {
    flex: 1 1 auto;
    padding: var(--spacing-md);
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.9;
    min-height: 280px;
}

.move-pair {
    display: block;
    margin-bottom: var(--spacing-xs);
    padding: var(--spacing-xs);
    border-radius: 4px;
    transition: background 0.2s;
}

.move-pair:hover {
    background: var(--bg-primary);
}

.move-number {
    color: var(--text-secondary);
    font-weight: bold;
    margin-right: var(--spacing-sm);
}

.move {
    padding: 2px 6px;
    margin: 0 4px;
    cursor: pointer;
    border-radius: 3px;
    transition: background 0.2s;
}

.move:hover {
    background: var(--secondary-color);
    color: white;
}

.move.current {
    background: var(--primary-color);
    color: white;
    font-weight: bold;
}

/* ===== NAVIGATION CONTROLS ===== */
.navigation-controls {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.nav-btn {
    flex: 1;
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 16px;
    color: var(--primary-color);
}

.nav-btn:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

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

/* ===== ANALYSIS PANEL ===== */
.analysis-panel {
    width: 100%;
    /* Remove max-width - wrapper controls width now */
    /* Compact mode - limit height to avoid pushing Move History */
    max-height: 280px;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

.analysis-content {
    padding: var(--spacing-sm);
    flex: 1 1 auto;
    overflow-y: auto;
    min-height: 0;
}

/* PV Container - FIRST AND DOMINANT ELEMENT */
.best-line-container {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(44, 95, 158, 0.08), rgba(44, 95, 158, 0.15));
    border-radius: 4px;
    border: 2px solid var(--primary-color);
    border-left: 4px solid var(--primary-color);
    max-height: 150px;
    overflow-y: auto;
    flex: 1 1 auto;
    min-height: 60px;
    margin-bottom: var(--spacing-md);
}

/* Compact Info Row - All stats in one line below PV */
.analysis-info-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    flex-shrink: 0;
}

.stat-item {
    text-align: center;
    padding: 6px 8px;
    background: var(--bg-primary);
    border-radius: 3px;
}

.stat-item-compact {
    padding: 6px 4px;
}

.stat-item-secondary {
    opacity: 0.7;
}

.stat-item-secondary .stat-label {
    font-size: 8px;
}

.stat-item-secondary .stat-value {
    font-size: 11px;
}

.stat-label {
    display: block;
    font-size: 9px;
    color: var(--text-secondary);
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}

.best-line-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.best-line-moves {
    font-family: 'Segoe UI', 'Courier New', monospace;
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-primary);
    font-weight: 600;
    min-height: 40px;
    padding: 8px 10px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 3px;
    word-wrap: break-word;
}

/* MultiPV Lines */
.pv-lines {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.pv-line {
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: 4px;
    border-left: 3px solid var(--primary-color);
}

.pv-line:nth-child(2) {
    border-left-color: var(--secondary-color);
}

.pv-line:nth-child(3) {
    border-left-color: var(--text-secondary);
}

.pv-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.pv-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 600;
}

.pv-line:nth-child(2) .pv-number {
    background: var(--secondary-color);
}

.pv-line:nth-child(3) .pv-number {
    background: var(--text-secondary);
}

.pv-eval {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}

.pv-moves {
    font-family: 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-primary);
}

.analysis-controls {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* ===== ENGINE PANEL ===== */
.engine-content,
.actions-content {
    padding: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

.engine-strength-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), #1e4d7b);
    border-radius: 6px;
    color: white;
    font-weight: 700;
    font-size: 16px;
}

.engine-strength-display i {
    font-size: 20px;
    color: #ffd700;
}

.engine-strength-note {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
    margin-bottom: 0;
}

.engine-status {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: 4px;
}

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

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--success-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.status-dot.busy {
    background: var(--accent-color);
}

.status-dot.error {
    background: var(--danger-color);
    animation: none;
}

/* ===== CREDITS PANEL ===== */
.credits-content {
    padding: var(--spacing-md);
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.credits-content p {
    margin-bottom: var(--spacing-sm);
}

/* ===== BUTTONS ===== */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-block {
    width: 100%;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 12px;
}

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

.btn-highlight:hover {
    background: #f57c00;
}

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

.btn-danger:hover {
    background: #d32f2f;
}

.icon-btn {
    padding: var(--spacing-xs);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

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

/* ===== MODALS ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.modal-header h2 {
    font-size: 20px;
    color: var(--primary-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--bg-primary);
    color: var(--danger-color);
}

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

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ===== MODAL SPECIFIC STYLES ===== */
.time-options,
.color-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.promotion-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.promotion-btn {
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 16px;
    font-weight: 600;
}

.promotion-btn i {
    font-size: 48px;
    color: var(--primary-color);
}

.promotion-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.promotion-btn:active {
    transform: translateY(-2px);
}

.time-btn,
.color-btn {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-secondary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
}

.time-btn:hover,
.color-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
}

.time-btn.active,
.color-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.menu-section {
    margin-bottom: var(--spacing-lg);
}

.menu-section h3 {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.embed-code {
    width: 100%;
    height: 120px;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    resize: vertical;
    margin-bottom: var(--spacing-md);
}

.error-message {
    color: var(--danger-color);
    font-size: 13px;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(244, 67, 54, 0.1);
    border-radius: 4px;
    display: none;
}

.error-message.show {
    display: block;
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1400px) {
    :root {
        --board-size: 500px;
        --sidebar-width: 250px;
    }
}

@media (max-width: 1200px) {
    :root {
        --board-size: 450px;
        --sidebar-width: 220px;
    }
}

/* Tablet breakpoint - tighten side panels */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
        --spacing-md: 12px;
    }

    .main-content {
        padding: var(--spacing-sm);
    }
}

/* Mobile breakpoint - stack everything vertically */
@media (max-width: 768px) {
    /* Hide desktop menu button on tablet and mobile */
    .menu-desktop-only {
        display: none !important;
    }

    .main-content {
        flex-direction: column;
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    /* Mobile content order: board first */
    .board-container {
        order: 1;
        width: 100%;
    }

    .left-sidebar {
        order: 2;
        width: 100%;
    }

    .right-sidebar {
        order: 3;
        width: 100%;
    }

    /* Board scales to viewport */
    #chessboard {
        width: min(95vw, 520px) !important;
        height: min(95vw, 520px) !important;
        border-width: 2px;
    }

    /* Ensure wrapper scales on mobile */
    .board-editor-wrapper {
        max-width: min(95vw, 520px);
    }

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

    /* Compact panels on mobile */
    .panel {
        padding: var(--spacing-sm);
    }

    .panel-title {
        font-size: 14px;
    }

    /* Board Editor Mobile: Stack to 1 column */
    .editor-content {
        grid-template-columns: 1fr; /* Single column on mobile */
        max-height: 400px; /* Taller on mobile */
        gap: var(--spacing-sm);
    }

    .editor-left {
        order: 1;
    }

    .editor-right {
        order: 2;
    }

    /* Slightly larger piece buttons on mobile for touch */
    .piece-btn {
        width: 38px;
        height: 38px;
    }
}

/* Extra compact mobile - improve touch targets */
@media (max-width: 480px) {
    :root {
        --spacing-sm: 6px;
        --spacing-md: 10px;
        --spacing-lg: 14px;
    }

    .header {
        padding: var(--spacing-sm);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }

    .header-controls {
        /* Mobile: Use grid for auto-fill behavior */
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: var(--spacing-xs);
        width: 100%;
    }

    .header-controls .btn {
        width: 100%; /* Fill grid cell completely */
    }

    .app-title {
        font-size: 18px;
        text-align: center;
    }

    /* Touch-friendly buttons - min 44px height */
    .btn {
        font-size: 16px; /* Prevents iOS zoom */
        padding: 12px 16px;
        min-height: 44px;
        min-width: 44px;
    }

    /* Touch-friendly inputs - min 16px font to prevent zoom */
    .form-control,
    select,
    input[type="number"],
    input[type="text"] {
        font-size: 16px;
        min-height: 44px;
        padding: 10px 12px;
    }

    /* Compact board on small phones */
    #chessboard {
        width: min(96vw, 480px) !important;
        height: min(96vw, 480px) !important;
        border-width: 2px;
    }

    /* Ensure wrapper scales on very small screens */
    .board-editor-wrapper {
        max-width: min(96vw, 480px);
    }

    /* Analysis info row stays compact on mobile */
    .analysis-info-row {
        grid-template-columns: repeat(4, 1fr);
        gap: 4px;
    }

    .stat-item-compact {
        padding: 4px 2px;
    }

    .stat-label {
        font-size: 8px;
    }

    .stat-value {
        font-size: 12px;
    }

    .stat-item-secondary .stat-label {
        font-size: 7px;
    }

    .stat-item-secondary .stat-value {
        font-size: 10px;
    }

    .time-options,
    .color-options {
        grid-template-columns: 1fr;
    }

    /* Reduce panel padding */
    .panel {
        padding: var(--spacing-sm);
    }

    .panel-title {
        font-size: 13px;
        padding: var(--spacing-xs);
    }

    /* Board Editor Extra Compact on Small Phones */
    .editor-content {
        max-height: 440px; /* Even taller on very small screens */
        padding: var(--spacing-sm);
    }

    .piece-btn {
        width: 36px; /* Touch-friendly size */
        height: 36px;
    }

    .editor-actions-compact .btn {
        font-size: 10px;
        padding: 6px 2px;
    }

    .control-label {
        font-size: 10px;
    }

    .radio-inline,
    .checkbox-inline {
        font-size: 11px;
    }

    /* Make move history more compact */
    .move-history {
        max-height: 200px;
    }

    /* Stack engine controls vertically on very small screens */
    .engine-controls {
        flex-direction: column;
    }

    .engine-controls .btn {
        width: 100%;
    }
}

/* ===== ACCESSIBILITY ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

button:focus,
.form-control:focus,
.btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== PRINT STYLES ===== */
@media print {
    .header,
    .left-sidebar,
    .right-sidebar,
    .analysis-panel {
        display: none;
    }

    .board-container {
        width: 100%;
        max-width: 100%;
    }
}

/* ===== BOARD EDITOR PANEL ===== */
.editor-panel {
    width: 100%;
    overflow: hidden; /* No scrolling */
    box-sizing: border-box;
}

/* 2-Column Grid: Left = Piece Palette, Right = Controls */
.editor-content {
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 240px; /* Left: flexible, Right: fixed width */
    gap: var(--spacing-md);
    overflow: hidden;
    max-height: 280px; /* Compact rectangle on desktop */
}

/* Left Column: Piece Palette */
.editor-left {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.piece-palette {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.palette-row {
    display: flex;
    align-items: center;
    gap: 6px; /* Tighter spacing */
}

.palette-row-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 20px; /* Shortened from 50px */
}

.palette-tools {
    justify-content: flex-start;
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--border-color);
}

/* Compact Piece Buttons */
.piece-btn {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 4px; /* Reduced from 6px */
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1;
    width: 34px; /* Reduced from 40px */
    height: 34px;
}

.piece-btn img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.piece-btn i {
    font-size: 16px; /* Reduced from 18px */
    color: var(--text-secondary);
}

.piece-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    transform: translateY(-1px); /* Reduced from -2px */
    box-shadow: var(--shadow-sm);
}

.piece-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.piece-btn.active i {
    color: white;
}

/* Right Column: Controls */
.editor-right {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow: hidden;
}

/* Compact Action Buttons (Horizontal Row) */
.editor-actions-compact {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.editor-actions-compact .btn {
    padding: 8px 4px;
    font-size: 11px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.editor-actions-compact .btn i {
    font-size: 16px;
}

/* Inline Side to Move */
.side-to-move-compact {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs);
    background: var(--bg-primary);
    border-radius: 4px;
}

.control-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 50px;
}

.radio-inline {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    cursor: pointer;
}

.radio-inline input[type="radio"] {
    cursor: pointer;
}

/* Compact Castling Grid */
.castling-compact {
    padding: var(--spacing-xs);
    background: var(--bg-primary);
    border-radius: 4px;
}

.castling-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-top: 4px;
}

.checkbox-inline {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    cursor: pointer;
}

.checkbox-inline input[type="checkbox"] {
    cursor: pointer;
}

/* Board in editor mode */
.board-container.edit-mode .chessboard-63f37 .square-55d63 {
    cursor: crosshair !important;
}

.board-container.edit-mode .chessboard-63f37 .piece-417db {
    pointer-events: none;
}

/* ===== ENGINE VS ENGINE PANEL ===== */
.eve-panel {
    margin-top: var(--spacing-md);
}

.eve-content {
    padding: var(--spacing-md);
}

.eve-status {
    background: var(--bg-primary);
    border-radius: 4px;
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.eve-status p {
    margin: var(--spacing-xs) 0;
    font-size: 14px;
}

.eve-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-secondary);
}



/* ===== PGN LIBRARY PANEL ===== */
.pgn-library-panel {
    margin-top: var(--spacing-md);
}

.pgn-library-content {
    padding: var(--spacing-md);
}

.pgn-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: 4px;
    font-size: 13px;
}

.pgn-info p {
    margin: var(--spacing-xs) 0;
}

.pgn-info strong {
    color: var(--primary-color);
}

/* ===== CAISSA INSIGHT MODULE ===== */

/* Larger modal for Insight */
.modal-large {
    max-width: 900px;
    width: 90%;
}

/* Insight intro section */
.insight-intro {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(33, 150, 243, 0.1));
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.insight-description {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    margin: 0;
}

.insight-description i {
    color: var(--primary-color);
    margin-right: 8px;
}

/* Insight sections */
.insight-section {
    margin-bottom: var(--spacing-lg);
}

.insight-section h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 8px;
}

.insight-section h3 i {
    color: var(--primary-color);
}

/* PGN textarea */
.insight-textarea {
    font-family: 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.5;
    resize: vertical;
    min-height: 150px;
}

/* File input styling */
.insight-file-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.file-name-display {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
}

/* Insight actions */
.insight-actions {
    margin-top: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.insight-actions .btn {
    flex: 1;
    min-width: 150px;
}

/* Stats grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.stat-card {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.stat-card .stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Radar chart container */
.insight-radar-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: 4px;
    text-align: center;
}

.insight-radar-container canvas {
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

/* Narrative section */
.insight-narrative {
    margin-top: var(--spacing-lg);
}

.narrative-content {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 4px;
    border-left: 4px solid var(--primary-color);
    line-height: 1.8;
    font-size: 14px;
}

.narrative-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.narrative-content h4:first-child {
    margin-top: 0;
}

.narrative-content ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.narrative-content li {
    margin: var(--spacing-xs) 0;
}

/* Responsive design for Insight modal */
@media (max-width: 768px) {
    .modal-large {
        width: 95%;
        max-width: none;
    }

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

    .insight-actions {
        flex-direction: column;
    }

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

    .insight-radar-container canvas {
        width: 100%;
        height: auto;
    }
}

@media (max-width: 480px) {
    .insight-intro {
        padding: var(--spacing-sm);
    }

    .insight-description {
        font-size: 14px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card .stat-value {
        font-size: 20px;
    }
}

/* ===== GAME IMPORT TABS ===== */

.import-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.import-tab {
    flex: 1;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: -2px;
}

.import-tab:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.import-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.import-panel {
    display: none;
}

.import-panel.active {
    display: block;
}

/* ===== COACH REPORT MODULE ===== */

/* Configuration grid */
.coach-config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Progress section */
.coach-progress {
    padding: var(--spacing-lg);
    text-align: center;
}

.progress-bar-container {
    width: 100%;
    height: 24px;
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 12px;
}

.progress-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin: var(--spacing-sm) 0 0;
}

/* Coach sections */
.coach-section {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: 8px;
    border-left: 4px solid var(--border-color);
}

.coach-section h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.coach-working {
    border-left-color: var(--success-color);
}

.coach-working h3 {
    color: var(--success-color);
}

.coach-not-working {
    border-left-color: var(--danger-color);
}

.coach-not-working h3 {
    color: var(--danger-color);
}

.coach-patterns {
    border-left-color: var(--accent-color);
}

.coach-patterns h3 {
    color: var(--accent-color);
}

/* Patterns grid */
.coach-patterns-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.pattern-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.pattern-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.pattern-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.pattern-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.pattern-badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    background: var(--danger-color);
    color: white;
}

.pattern-stats {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.pattern-impact {
    font-size: 12px;
    color: var(--text-secondary);
}

.pattern-impact strong {
    color: var(--danger-color);
}

/* Training plan */
.coach-training-plan {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.training-day {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.training-day:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.training-day-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.training-day-content {
    flex: 1;
}

.training-day-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.training-day-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
    .coach-config-grid {
        grid-template-columns: 1fr;
    }

    .coach-patterns-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== CAISSA INSIGHT INDICATOR ===== */

.insight-indicator {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 12px;
    height: 12px;
    background: var(--success-color);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

#caissaInsightBtn {
    position: relative;
}

/* ===== CLEAR INSIGHT SESSION MODAL ===== */

.clear-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.clear-option-btn {
    width: 100%;
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.clear-option-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.clear-option-danger {
    border-color: var(--danger-color);
}

.clear-option-danger:hover {
    border-color: var(--danger-color);
    background: rgba(239, 83, 80, 0.05);
}

.option-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.clear-option-danger .option-icon {
    background: var(--danger-color);
}

.clear-option-btn:last-child .option-icon {
    background: var(--text-secondary);
}

.option-content {
    flex: 1;
}

.option-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 8px 0;
}

.option-content p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 4px 0;
    line-height: 1.4;
}

.option-content p strong {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .clear-option-btn {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .option-icon {
        margin-bottom: var(--spacing-sm);
    }
}