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

:root {
    --bg-color: #f5f1e8;
    --text-color: #2c2416;
    --text-muted: #5c5445;
    --accent-color: #8b4513;
    --accent-hover: #a0522d;
    --success-color: #2e7d32;
    --warning-color: #f57c00;
    --error-color: #c62828;
    --card-bg: #fffef9;
    --border-color: #d4c9b5;
    --shadow: 0 2px 8px rgba(44, 36, 22, 0.1);
}

body {
    font-family: Georgia, 'Times New Roman', serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

header {
    text-align: center;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: normal;
    letter-spacing: 0.02em;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-muted);
    font-style: italic;
}

.screen {
    animation: fadeIn 0.3s ease;
}

.screen.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Buttons */
.btn {
    font-family: inherit;
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

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

.btn-text {
    background: none;
    color: var(--text-muted);
    text-decoration: underline;
    padding: 0.5rem;
}

.btn-text:hover {
    color: var(--text-color);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Start Screen */
.start-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.intro {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--text-muted);
}

.settings {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.settings label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    display: block;
    text-align: left;
}

.settings select {
    font-family: inherit;
    font-size: 1rem;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: white;
    width: 100%;
}

.high-score {
    margin-top: 2rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Game Screen */
.game-header {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.progress, .score {
    font-size: 0.95rem;
}

.score {
    font-weight: bold;
}

.campaign-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.campaign-title {
    font-size: 1.3rem;
    font-weight: normal;
    font-style: italic;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.campaign-description {
    font-size: 1.05rem;
    line-height: 1.8;
}

.campaign-description p {
    margin-bottom: 1rem;
    text-align: justify;
}

.campaign-description p:last-child {
    margin-bottom: 0;
}

/* Hints */
.hints-container {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.hints-list {
    margin-top: 1rem;
}

.hint-item {
    background: #fff9e6;
    border-left: 3px solid var(--warning-color);
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    animation: fadeIn 0.3s ease;
}

/* Guess Section */
.guess-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
}

.guess-section label {
    display: block;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.input-row {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 1rem;
}

#year-input {
    font-family: inherit;
    font-size: 1.2rem;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    width: 150px;
    text-align: center;
}

#year-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Result Section */
.result-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
}

.result-display {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
}

.result-display .points {
    font-size: 2rem;
    font-weight: bold;
    display: block;
    margin-top: 0.5rem;
}

.result-display .points.perfect {
    color: var(--success-color);
}

.result-display .points.good {
    color: var(--warning-color);
}

.result-display .points.okay {
    color: var(--text-muted);
}

.result-display .points.miss {
    color: var(--error-color);
}

/* Timeline Visualization */
.timeline-viz {
    margin: 1.5rem 0;
    padding: 1rem;
}

.timeline-bar {
    position: relative;
    height: 40px;
    background: linear-gradient(to right, #e8e0d0, #d4c9b5);
    border-radius: 4px;
    margin: 0.5rem 0;
}

.timeline-marker {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.timeline-marker.actual {
    background: var(--success-color);
}

.timeline-marker.guess {
    background: var(--accent-color);
}

.timeline-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.timeline-legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-size: 0.85rem;
    margin-top: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.legend-dot.actual {
    background: var(--success-color);
}

.legend-dot.guess {
    background: var(--accent-color);
}

.explanation {
    text-align: left;
    background: #f0ede6;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    font-size: 0.95rem;
    line-height: 1.7;
}

.explanation h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--accent-color);
}

/* End Screen */
#end-screen {
    text-align: center;
}

#end-screen h2 {
    font-size: 1.8rem;
    font-weight: normal;
    margin-bottom: 2rem;
}

.final-score {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.score-number {
    font-size: 4rem;
    color: var(--accent-color);
    line-height: 1;
}

.score-label {
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.score-breakdown {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: left;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.breakdown-item .campaign {
    font-style: italic;
}

.breakdown-item .points {
    font-weight: bold;
}

.share-section {
    margin-bottom: 1.5rem;
}

.share-feedback {
    margin-top: 0.5rem;
    color: var(--success-color);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 600px) {
    .container {
        padding: 0.75rem;
    }

    header {
        padding: 1.5rem 0;
    }

    h1 {
        font-size: 1.5rem;
    }

    .campaign-container {
        padding: 1.25rem;
    }

    .campaign-description {
        font-size: 1rem;
        text-align: left;
    }

    .input-row {
        flex-direction: column;
        align-items: center;
    }

    #year-input {
        width: 100%;
        max-width: 200px;
    }

    .game-header {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .timeline-legend {
        flex-direction: column;
        gap: 0.5rem;
    }

    .score-number {
        font-size: 3rem;
    }
}