:root {
    /* Wood Theme */
    --bg-gradient: linear-gradient(135deg, #2c1e14 0%, #1a120b 100%);
    --panel-bg: rgba(62, 44, 33, 0.85);
    --panel-border: rgba(193, 154, 107, 0.2);
    --text-primary: #ecdcc3;
    --text-secondary: #c2b280;
    --accent-color: #d4a017;
    /* Gold/Amber */
    --accent-glow: rgba(212, 160, 23, 0.4);
    --success-color: #6b8c42;
    --danger-color: #8c4242;
    --font-main: 'Outfit', sans-serif;
    --glass-blur: blur(10px);
}

body {
    background: var(--bg-gradient);
    color: var(--text-primary);
    font-family: var(--font-main);
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.app-container {
    width: 100%;
    max-width: 1400px;
    padding: 30px;
    margin: 0 auto;
    box-sizing: border-box;
    flex: 1;
    display: flex;
    flex-direction: column;
}

header {
    margin-bottom: 40px;
    text-align: center;
    position: relative;
}

footer {
    margin-top: auto;
    padding-top: 40px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer p {
    margin: 5px 0;
}

footer strong {
    color: var(--accent-color);
}

.author-link {
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.2s;
    position: relative;
    padding-bottom: 2px;
}

.author-link:hover {
    color: #fff;
    text-shadow: 0 0 10px var(--accent-glow);
    border-bottom: 1px solid var(--accent-color);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(90deg, #fff, #7f5af0);
    -webkit-background-clip: text;
    background-clip: text;
    /* Standard property */
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px rgba(127, 90, 240, 0.3);
    letter-spacing: -0.02em;
}

.main-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(350px, 0.8fr);
    gap: 40px;
    align-items: start;
}

/* Glassmorphism Panel Base */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    padding: 24px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.board-container {
    padding: 12px;
    /* reduced padding */
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: fit-content;
    /* Fit to board */
    margin: 0 auto;
    /* Center in grid cell */
}

/* Highlights for Click-to-Move */
.highlight-selected {
    box-shadow: inset 0 0 0 3px var(--accent-color) !important;
}

.highlight-move {
    position: relative;
}

.highlight-move::after {
    content: '';
    position: absolute;
    width: 25%;
    height: 25%;
    background: rgba(100, 255, 100, 0.5);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

/* For capturing (pieces present) */
.highlight-move.capture-hint::after {
    background: transparent;
    border: 4px solid rgba(255, 80, 80, 0.6);
    width: 85%;
    height: 85%;
    border-radius: 50%;
    box-sizing: border-box;
}

.board-container::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 22px;
    padding: 2px;
    background: linear-gradient(45deg, transparent, var(--accent-color), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    /* Standard property */
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    /* Standard property */
    opacity: 0.5;
    pointer-events: none;
}

#board {
    width: 600px;
    /* Specific width */
    max-width: 100%;
    /* aspect-ratio: 1; removed to avoid conflicts */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-radius: 4px;
    overflow: hidden;
    margin: 0 auto;
    /* Center it */
}

/* Analysis Panel */
.analysis-panel {
    display: flex;
    flex-direction: column;
    gap: 25px;
    height: calc(100vh - 150px);
    max-height: 800px;
    position: sticky;
    top: 30px;
}

/* Eval Bar */
.eval-bar-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.eval-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.eval-bar-container {
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    position: relative;
    overflow: hidden;
    border: none;
}

.eval-bar {
    height: 100%;
    background: linear-gradient(90deg, #ffffff, #e0e0e0);
    /* White advantage */
    width: 50%;
    transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.4);
}

/* When black is winning, maybe invert via JS or just stick to visual logic */

/* Controls */
.controls textarea {
    width: 100%;
    height: 100px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--panel-border);
    color: var(--text-primary);
    padding: 15px;
    border-radius: 12px;
    resize: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    transition: border-color 0.2s;
    outline: none;
    box-sizing: border-box;
}

.controls textarea:focus {
    border-color: var(--accent-color);
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 15px;
}

.toggle-group {
    display: flex;
    gap: 10px;
}

.toggle-group button {
    padding: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    line-height: 1.2;
}

.toggle-group button.active-mode {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
}

button {
    flex: 1;
    background: rgba(127, 90, 240, 0.1);
    color: var(--accent-color);
    border: 1px solid rgba(127, 90, 240, 0.3);
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-family: var(--font-main);
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.8rem;
}

button:hover {
    background: var(--accent-color);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-2px);
}

/* Move History */
.move-history {
    flex-grow: 1;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--panel-border);
}

.moves-header {
    padding: 15px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--panel-border);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.moves-list {
    overflow-y: auto;
    padding: 10px;
    flex: 1;
}

.moves-list::-webkit-scrollbar {
    width: 6px;
}

.moves-list::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.move-row {
    display: grid;
    grid-template-columns: 40px 1fr 1fr;
    padding: 8px 10px;
    font-size: 0.95rem;
    border-radius: 6px;
    margin-bottom: 2px;
    transition: background 0.1s;
}

.move-row:hover {
    background: rgba(255, 255, 255, 0.05);
}

.move-row:nth-child(odd) {
    background: rgba(255, 255, 255, 0.02);
}

.move-num {
    color: #666;
    font-family: monospace;
}

.move {
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
}

.move:hover {
    color: #fff;
}

/* Status Bar */
.status-bar {
    margin-top: 15px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--success-color);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--success-color);
}

#board {
    max-width: 100%;
}

@media (max-width: 1000px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .analysis-panel {
        height: auto;
        max-height: none;
        position: static;
    }

    #board {
        max-width: 100%;
    }
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: none;
    /* Hidden by default */
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    width: 90%;
    max-width: 400px;
    text-align: center;
    border: 1px solid var(--accent-color);
}

.modal-content h2 {
    margin-top: 0;
    color: var(--accent-color);
}

.setup-group {
    margin-bottom: 20px;
    text-align: left;
}

.setup-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.toggle-group button {
    flex: 1;
    opacity: 0.7;
}

.toggle-group button.active {
    opacity: 1;
    background: var(--accent-color);
    color: #fff;
    box-shadow: 0 0 15px var(--accent-glow);
    border-color: var(--accent-color);
}

.primary-btn {
    background: var(--accent-color);
    color: #fff;
    border: none;
    padding: 12px;
    width: 100%;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--accent-glow);
}