:root {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --primary-color: #4CAF50;
    --accent-color: #007BFF;
    --border-color: #444;
    --panel-bg: rgba(26, 26, 26, 0.92);
    --button-bg: #333;
    --button-hover-bg: #555;
    --font-family: 'Segoe UI', Arial, sans-serif;
    --certificate-bg: #f8f8f0;
    --certificate-text: #333;
    --certificate-border: #d0d0c0;
    --decorative-font: 'Georgia', serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    min-height: 100vh;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 98vw;
    max-width: 1400px;
    min-height: 90vh;
    background: #232323;
    border-radius: 18px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.35);
    padding: 40px 30px 30px 30px;
    display: flex;
    flex-direction: column;
    gap: 30px;
    align-items: center;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 400;
    color: #e0e0e0;
    margin-bottom: 10px;
    letter-spacing: 0.1em;
}

.main-content {
    display: flex;
    gap: 32px;
    width: 100%;
    justify-content: center;
    align-items: flex-start;
}

.simulation-section, .graph-section {
    background: #181818;
    border-radius: 14px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.18);
    padding: 18px 18px 18px 18px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.simulation-section {
    min-width: 640px;
    max-width: 640px;
}

.graph-section {
    min-width: 640px;
    max-width: 640px;
}

.canvas-container {
    position: relative;
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    background-color: #000000;
    border-radius: 10px;
    margin-bottom: 10px;
}

#gameCanvas, #speedGraphCanvas {
    display: block;
    background: #111;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.25);
    border: 2px solid #333;
}

#gameCanvas {
    width: 600px;
    height: 600px;
}

#speedGraphCanvas {
    width: 600px;
    height: 300px;
}

.info-panel {
    position: absolute;
    top: 24px;
    left: 24px;
    background: var(--panel-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.35);
    padding: 18px 20px;
    min-width: 160px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 15px;
    text-align: left;
}

.status-info p {
    margin: 0;
    font-size: 1.1rem;
}

.actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.button-group, .help-mode {
    display: flex;
    align-items: center;
    gap: 10px;
}

button {
    padding: 10px 28px;
    font-size: 1.1rem;
    border-radius: 6px;
    background: var(--button-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    margin: 0 4px;
    transition: background 0.2s, color 0.2s;
    cursor: pointer;
}

button:hover:not(:disabled) {
    background: var(--primary-color);
    color: #fff;
}

button:disabled {
    cursor: not-allowed;
    background: #222;
    color: #666;
}

.graph-header h2 {
    font-size: 1.1rem;
    color: #b0b0b0;
    margin: 0 0 10px 0;
    text-align: center;
}

.graph-container {
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    background-color: #000000;
    border-radius: 10px;
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.evaluation-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    border: 2px solid var(--certificate-border);
    background-color: var(--certificate-bg);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.evaluation-header h3 {
    font-size: 1.2rem;
    font-family: var(--decorative-font);
    color: var(--certificate-text);
    margin-bottom: 5px;
}

.evaluation-actions {
    margin-top: 14px;
    display: flex;
    gap: 12px;
    justify-content: center;
}

#resultDisplay,
.certificate-body {
    font-size: 1.05rem;
    color: var(--certificate-text);
    font-family: var(--decorative-font), serif;
    white-space: pre-line;
    line-height: 1.3;
    margin: 0;
    text-align: center;
    background: #f8f8f0;
    border-radius: 8px;
    padding: 10px 18px;
    min-height: 32px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

@media (max-width: 1300px) {
    .main-content {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }
    .simulation-section, .graph-section {
        min-width: 0;
        max-width: 100vw;
        width: 100%;
    }
}