:root {
    --bg-color: #1A1C29;
    --container-bg: #2D3047;
    --surface-bg: #1F2133;
    --surface-alt-bg: #2D3047;
    --text-color: #E6E8FA;
    --muted-text: #A9B2D3;
    --secondary-button-bg: #4A4E69;
    --secondary-button-hover: #5A5E7D;
    --secondary-button-border: #5A5E7D;
    --toggle-bg: rgba(255, 255, 255, 0.08);
    --toggle-hover: rgba(255, 255, 255, 0.16);
    --shadow-color: rgba(0, 0, 0, 0.2);
}

body[data-theme="light"] {
    --bg-color: #F3F6FB;
    --container-bg: #FFFFFF;
    --surface-bg: #EEF3FA;
    --surface-alt-bg: #F8FAFD;
    --text-color: #182033;
    --muted-text: #5D6885;
    --secondary-button-bg: #E5EBF5;
    --secondary-button-hover: #D8E2F1;
    --secondary-button-border: #C4D0E4;
    --toggle-bg: #E9EEF8;
    --toggle-hover: #DCE6F5;
    --shadow-color: rgba(15, 23, 42, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px 0;
    transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
    background-color: var(--container-bg);
    border-radius: 12px;
    padding: 24px;
    width: min(420px, calc(100vw - 32px));
    box-shadow: 0 10px 25px var(--shadow-color);
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dice-icon {
    width: 24px;
    height: 24px;
}

.header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.theme-toggle {
    background-color: var(--toggle-bg);
    color: var(--text-color);
    border: none;
    border-radius: 999px;
    padding: 10px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.25s ease, color 0.25s ease;
}

.theme-toggle:hover {
    background-color: var(--toggle-hover);
}

.description {
    font-size: 0.9rem;
    color: var(--muted-text);
    margin: 8px 0 24px;
}

.main-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

#generate-btn {
    flex-grow: 1;
    background: linear-gradient(90deg, #3B82F6, #22D3EE);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 0;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

#generate-btn:hover {
    opacity: 0.9;
}

#copy-btn {
    background-color: var(--secondary-button-bg);
    color: var(--text-color);
    border: 1px solid var(--secondary-button-border);
    border-radius: 8px;
    padding: 0 16px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

#copy-btn:hover {
    background-color: var(--secondary-button-hover);
}

.bonus-option {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
}

#bonus-checkbox {
    accent-color: #3B82F6;
}

.bonus-option label {
    font-size: 0.9rem;
    color: var(--muted-text);
}

.results-container {
    background-color: var(--surface-bg);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: background-color 0.25s ease;
}

.numbers-display {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 16px;
}

.result-set-box {
    background-color: var(--surface-alt-bg);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background-color 0.25s ease;
}

.set-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--muted-text);
    width: 60px;
}

.number-circles-container {
    display: flex;
    flex-grow: 1;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.number-circle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 700;
    color: #1F2133;
}

.bonus-separator,
.timestamp {
    font-size: 0.8rem;
    color: var(--muted-text);
    margin: 0;
}

.bonus-separator {
    font-size: 1rem;
    font-weight: 700;
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    .top-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .theme-toggle {
        width: 100%;
    }

    .result-set-box {
        flex-direction: column;
        align-items: flex-start;
    }

    .set-label {
        width: auto;
    }

    .number-circles-container {
        justify-content: flex-start;
    }
}