:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --container-bg: #ffffff;
    --btn-bg: #007bff;
    --btn-text: #ffffff;
    --border-color: #dee2e6;
    --ball-color: #fbc02d;
    --accent-color: #e83e8c;
    --danger-color: #dc3545;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #e9ecef;
    --container-bg: #1e1e1e;
    --btn-bg: #375a7f;
    --btn-text: #ffffff;
    --border-color: #444;
    --ball-color: #ffca28;
    --accent-color: #ff79c6;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.header-actions {
    display: flex;
    justify-content: flex-end;
}

#theme-toggle {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
}

h1 { text-align: center; margin-bottom: 30px; }
h2 { border-bottom: 2px solid var(--btn-bg); padding-bottom: 10px; margin: 0; }

.stats-section, .history-section, .winning-input-section {
    margin-bottom: 30px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: 40px;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--btn-bg);
    padding-bottom: 10px;
}

.btn-danger {
    padding: 5px 12px;
    font-size: 13px;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.method-selector {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 20px;
}

#generate, #save-win {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    cursor: pointer;
    transition: transform 0.1s;
}

#save-win { width: auto; padding: 0 20px; }

#generate:active { transform: scale(0.98); }

.lotto-list {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lotto-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 10px;
    background: rgba(0,0,0,0.03);
    border-radius: 50px;
    position: relative;
}

.ball {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background-color: var(--ball-color);
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 14px;
    box-shadow: inset -3px -3px 5px rgba(0,0,0,0.2);
}

.input-group {
    display: flex;
    gap: 5px;
    justify-content: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.input-group input {
    width: 45px;
    height: 45px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--container-bg);
    color: var(--text-color);
    font-size: 16px;
}

.history-list {
    max-height: 500px;
    overflow-y: auto;
}

.history-item {
    padding: 20px 15px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.round-badge {
    background: var(--btn-bg);
    color: white;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
}

.history-date { font-size: 12px; color: #888; }

.btn-delete-item {
    background: none;
    border: none;
    color: var(--danger-color);
    font-size: 18px;
    cursor: pointer;
    padding: 0 5px;
}

.match-count { font-weight: bold; color: var(--accent-color); font-size: 13px; margin-left: 5px; }