:root {
    --bg-color-light: #f0f0f0;
    --text-color-light: #1a1a1a;
    --accent-color-light: #007aff;
    --secondary-bg-light: #ffffff;
    --ready-color-light: #ff9500;
    --go-color-light: #34c759;
    --error-color-light: #ff3b30;

    --bg-color-dark: #1c1c1e;
    --text-color-dark: #f2f2f7;
    --accent-color-dark: #0a84ff;
    --secondary-bg-dark: #2c2c2e;
    --ready-color-dark: #ff9f0a;
    --go-color-dark: #30d158;
    --error-color-dark: #ff453a;

    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --accent-color: var(--accent-color-light);
    --secondary-bg: var(--secondary-bg-light);
    --ready-color: var(--ready-color-light);
    --go-color: var(--go-color-light);
    --error-color: var(--error-color-light);

    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Roboto', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    text-align: center;
    user-select: none;
    -webkit-user-select: none;
}

body.dark-mode {
    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --accent-color: var(--accent-color-dark);
    --secondary-bg: var(--secondary-bg-dark);
    --ready-color: var(--ready-color-dark);
    --go-color: var(--go-color-dark);
    --error-color: var(--error-color-dark);
    --shadow-color: rgba(0, 0, 0, 0.4);
}

.header, .footer {
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
}

.title {
    font-size: 3rem;
    font-weight: 900;
    margin: 0;
    color: var(--accent-color);
}

.subtitle {
    font-size: 1.2rem;
    margin: 5px 0 0;
    opacity: 0.8;
}

.game-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    flex-grow: 1;
}

.game-area {
    width: 90%;
    max-width: 500px;
    height: 60vh;
    max-height: 400px;
    background-color: var(--secondary-bg);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.1s;
    box-shadow: 0 10px 30px var(--shadow-color);
}

.game-area.wait {
    background-color: var(--secondary-bg);
}
.game-area.ready {
    background-color: var(--ready-color);
}
.game-area.go {
    background-color: var(--go-color);
}
.game-area.error {
    background-color: var(--error-color);
}

.message {
    font-size: 1.8rem;
    font-weight: 700;
    padding: 20px;
}

.tagline {
    margin-top: 20px;
    font-size: 1rem;
    font-weight: 700;
    opacity: 0.6;
}

.highscore-form {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.highscore-form.hidden {
    display: none;
}

#player-name {
    padding: 10px;
    border: 2px solid var(--accent-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
}

#submit-score {
    padding: 10px 15px;
    border: none;
    border-radius: 8px;
    background-color: var(--accent-color);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
}

.highscore-display {
    font-size: 1.1rem;
    min-height: 25px;
    margin-bottom: 20px;
}

.about-section {
    width: 90%;
    max-width: 600px;
    margin: 20px 0;
    padding: 20px;
    background-color: var(--secondary-bg);
    border-radius: 15px;
    text-align: left;
    line-height: 1.6;
}

.about-section h2 {
    color: var(--accent-color);
    margin-top: 0;
}

.footer-links {
    margin-top: 20px;
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

.help-button {
    position: absolute;
    top: 20px;
    left: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

/* Modal Styles */
.modal {
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: var(--secondary-bg);
    margin: 15% auto;
    padding: 30px;
    border-radius: 15px;
    width: 80%;
    max-width: 500px;
    box-shadow: 0 5px 15px var(--shadow-color);
    position: relative;
    text-align: left;
    color: var(--text-color);
}

.modal-content h2 {
    font-size: 1.8rem;
    margin-top: 0;
    color: var(--accent-color);
}

.modal-content p {
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 10px;
}

.close-button {
    color: var(--text-color);
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-button:hover,
.close-button:focus {
    color: var(--accent-color);
    text-decoration: none;
    cursor: pointer;
}

@media (max-width: 600px) {
    .title {
        font-size: 2.5rem;
    }
    .subtitle {
        font-size: 1rem;
    }
    .message {
        font-size: 1.5rem;
    }
}