* {
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    padding: 8px;
    -webkit-tap-highlight-color: transparent;
}
.container {
    text-align: center;
    background: white;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    width: 100%;
    max-width: 440px;
}
h1 {
    font-size: 1.3rem;
    margin: 0 0 0.5rem;
}
#status {
    margin-bottom: 0.8rem;
    font-weight: bold;
    font-size: 1rem;
    color: #555;
    min-height: 1.5em;
}
#board {
    width: 400px;
}

/* ─── Board + Eval Bar ─── */
.board-row {
    display: flex;
    justify-content: center;
    align-items: stretch;
    margin: 0 auto;
    width: 100%;
}
.eval-bar {
    width: 24px;
    flex-shrink: 0;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    margin-right: 6px;
    background: #555;
}
.eval-fill-white {
    position: absolute;
    bottom: 50%;
    left: 0;
    right: 0;
    height: 0%;
    background: linear-gradient(to top, #8BC34A, #4CAF50);
    transition: height 0.3s;
}
.eval-fill-black {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 0%;
    background: linear-gradient(to bottom, #ff8a80, #f44336);
    transition: height 0.3s;
}
.eval-center {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(0,0,0,0.35);
}
.eval-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-90deg);
    font-size: 11px;
    font-weight: bold;
    color: #fff;
    text-shadow: 0 0 3px rgba(0,0,0,0.7);
    white-space: nowrap;
    z-index: 2;
    pointer-events: none;
}

/* ─── Controls ─── */
.controls-row {
    margin-top: 0.6rem;
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}
button {
    padding: 8px 14px;
    border: none;
    border-radius: 6px;
    background-color: #4CAF50;
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    touch-action: manipulation;
    white-space: nowrap;
}
button:active {
    transform: scale(0.96);
}
button:hover {
    background-color: #45a049;
}
button:disabled {
    background-color: #ccc !important;
    cursor: default;
    transform: none;
}
#flipBtn {
    background-color: #2196F3;
}
#flipBtn:hover {
    background-color: #0b7dda;
}
#copyBtn {
    background-color: #FF9800;
}
#copyBtn:hover {
    background-color: #e68900;
}
#reviewBtn {
    background-color: #607D8B;
}
#reviewBtn:hover {
    background-color: #546E7A;
}
.btn-danger {
    background-color: #f44336;
}
.btn-danger:hover {
    background-color: #D32F2F;
}
select {
    padding: 8px 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 0.9rem;
    background: white;
    cursor: pointer;
    touch-action: manipulation;
}

/* ─── Review Controls ─── */
.review-controls {
    margin-top: 0.6rem;
    display: flex;
    gap: 6px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
    padding: 8px;
    background: #f0f4ff;
    border-radius: 8px;
}
.review-controls button {
    font-size: 0.85rem;
    padding: 6px 12px;
}
.review-info {
    width: 100%;
    text-align: center;
    font-size: 0.85rem;
    color: #333;
    min-height: 1.2em;
    padding-top: 2px;
}

/* ─── Training ─── */
.training-section {
    margin-top: 1rem;
    text-align: left;
}
.training-toggle {
    background-color: #673AB7;
    width: 100%;
    padding: 10px;
    font-size: 0.95rem;
}
.training-toggle:hover {
    background-color: #5E35B1;
}
.training-toggle.active {
    background-color: #FF5722;
}
.training-toggle.active:hover {
    background-color: #E64A19;
}
.training-panel {
    background: #f8f8ff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 0.8rem;
    margin-top: 0.5rem;
    transition: opacity 0.2s;
}
.training-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}
.training-title {
    font-weight: bold;
    font-size: 0.9rem;
}
.hint-label {
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}
.hint-label input {
    cursor: pointer;
}
.training-panel select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    background: white;
}
.opening-desc {
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 0.5rem;
    min-height: 1.2em;
}
.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.3rem;
}
.progress-fill {
    height: 100%;
    background: #4CAF50;
    border-radius: 4px;
    transition: width 0.3s;
}
.progress-text {
    font-size: 0.75rem;
    color: #888;
    margin-bottom: 0.4rem;
}
.training-hint {
    background: #FFF8E1;
    border: 1px solid #FFE082;
    border-radius: 6px;
    padding: 8px;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: #F57F17;
    font-weight: bold;
}
.training-actions {
    display: flex;
    gap: 8px;
}
.training-start {
    background-color: #4CAF50;
    flex: 1;
}
.training-start:hover {
    background-color: #388E3C;
}
.training-stop {
    background-color: #f44336;
    flex: 1;
}
.training-stop:hover {
    background-color: #D32F2F;
}
.training-stop:disabled {
    background-color: #ccc !important;
    cursor: default;
}

/* ─── PGN Section ─── */
.pgn-section {
    margin-top: 1rem;
    text-align: left;
}
.pgn-input {
    width: 100%;
    min-height: 60px;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.8rem;
    resize: vertical;
    margin-bottom: 0.5rem;
}

/* ─── PGN Display ─── */
.pgn-box {
    margin-top: 0.8rem;
    font-family: monospace;
    background: #eee;
    padding: 8px;
    border-radius: 6px;
    max-height: 120px;
    overflow-y: auto;
    text-align: left;
    font-size: 0.8rem;
    word-break: break-all;
    line-height: 1.4;
}
.flag-blunder {
    color: #d32f2f;
    font-weight: bold;
}
.flag-mistake {
    color: #f57c00;
    font-weight: bold;
}
.flag-good {
    color: #388E3C;
    font-weight: bold;
}
.pgn-move {
    white-space: nowrap;
}

/* ─── Move Highlight ─── */
.highlight-last {
    background: rgba(255, 235, 59, 0.45) !important;
    box-shadow: inset 0 0 0 2px rgba(255, 235, 59, 0.9);
}

/* ─── Toast ─── */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 100;
}
.toast.show {
    opacity: 1;
}

/* ─── Utils ─── */
.hidden {
    display: none;
}

@media (max-width: 460px) {
    .container {
        padding: 0.6rem;
        border-radius: 8px;
    }
    h1 {
        font-size: 1.1rem;
    }
    button {
        padding: 10px 12px;
        font-size: 0.85rem;
    }
}