h1:focus {
    outline: none;
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred."
    }

.darker-border-checkbox.form-check-input {
    border-color: #929292;
}
.lesson-actions {
    margin-top: 12px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.next-locked-message {
    font-size: 0.9rem;
    color: #666;
}
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f1e8, !important;
    color: #2b1b10;
}

.page-shell {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

.hero-bar {
    background: #2b1b10;
    color: #f6d77a;
    padding: 16px 20px;
    border-bottom: 4px solid #b58863;
}

    .hero-bar h1,
    .hero-bar h2 {
        margin: 0;
    }

.nav-buttons {
    margin: 16px 0;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

    .nav-buttons a,
    .nav-buttons button,
    .lesson-actions button {
        padding: 8px 14px;
        border: 1px solid #2b1b10;
        background: #f0d9b5;
        color: #2b1b10;
        border-radius: 6px;
        cursor: pointer;
        text-decoration: none;
        font-weight: bold;
    }

        .nav-buttons a:hover,
        .nav-buttons button:hover,
        .lesson-actions button:hover {
            background: #b58863;
            color: white;
        }

.lesson-card {
    background: white;
    border: 1px solid #d5c2a5;
    border-radius: 12px;
    padding: 18px;
    max-width: 760px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.hint-box,
.explanation-box {
    margin-top: 10px;
    background: #fff8e8;
    border: 1px solid #e0c990;
    border-radius: 8px;
    padding: 8px 12px;
}

.lesson-actions {
    margin-top: 14px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.next-locked-message {
    font-size: 0.9rem;
    color: #777;
}

.board-status {
    margin-top: 10px;
    font-weight: bold;
    color: #2b1b10;
}

.try-again-btn {
    margin-top: 6px;
    padding: 6px 12px;
    border: 1px solid #444;
    border-radius: 6px;
    background: #f0d9b5;
    cursor: pointer;
}
.home-board-preview {
    margin-top: 28px;
    display: flex;
    justify-content: center;
}
.home-shell {
    text-align: center;
}

.home-intro {
    margin-bottom: 20px;
}

.home-intro .nav-buttons {
    justify-content: center;
}
.top-links {
    margin-bottom: 14px;
}

.top-links a {
    color: #2b1b10;
    font-weight: bold;
    text-decoration: none;
}

.top-links a:hover {
     text-decoration: underline;
}
.chessboard {
    max-width: 90vw;
}

.full-board-area {
    display: flex;
    justify-content: center;
    align-items: center;
}
.lesson-complete-message {
    font-weight: bold;
    color: #2f6b2f;
}
.chess-play-shell {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.play-card {
    text-align: center;
}

    .play-card .nav-buttons {
        justify-content: center;
    }

.play-board-area {
    margin-top: 18px;
    display: flex;
    justify-content: center;
}

.mode-message {
    font-weight: bold;
    color: #5a321d;
    margin-top: 10px;
}
.fullscreen-board-page {
    max-width: none;
    width: 100%;
    padding: 12px;
}

    .fullscreen-board-page .play-card {
        max-width: 1000px;
        width: 100%;
    }

    .fullscreen-board-page .play-board-area {
        display: flex;
        justify-content: center;
    }

    .fullscreen-board-page .chessboard {
        transform: scale(1.25);
        transform-origin: top center;
        margin-bottom: 140px;
    }
.instruction-box {
    background: #eef6ff;
    border: 1px solid #b8d8f5;
    border-radius: 8px;
    padding: 10px 12px;
    margin: 12px 0;
}

    .instruction-box p {
        margin: 6px 0 0;
    }
.training-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
    max-width: 900px;
}
.training-intro {
    margin-bottom: 18px;
    color: #5a321d;
}