:root {
    --bg-color: #f8f9fa;
    --container-bg: white;
    --text-color: #212529;
    --muted-text: #6c757d;
    --shadow: rgba(0,0,0,0.1);
}

[data-theme='dark'] {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --muted-text: #b0b0b0;
    --shadow: rgba(0,0,0,0.5);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: 'Pretendard', sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 500px;
    background: var(--container-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 25px var(--shadow);
    text-align: center;
    position: relative;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    cursor: pointer;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: var(--text-color);
}

.lotto-ball {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: bold;
    font-size: 1.2rem;
    margin: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.lotto-ball:hover {
    transform: scale(1.1);
}

.ball-1 { background-color: #fbc400; }
.ball-11 { background-color: #69c8f2; }
.ball-21 { background-color: #ff7272; }
.ball-31 { background-color: #aaa; }
.ball-41 { background-color: #b0d840; }

#result {
    margin-top: 2rem;
    min-height: 70px;
}

.text-muted {
    color: var(--muted-text) !important;
}

.btn-generate {
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
    border-radius: 50px;
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    border: none;
    color: white;
    transition: all 0.3s ease;
}

.btn-generate:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

/* 폼 관련 스타일 */
.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-control {
    background-color: var(--bg-color);
    border: 1px solid var(--muted-text);
    color: var(--text-color);
    border-radius: 10px;
    padding: 0.75rem;
}

.form-control:focus {
    background-color: var(--bg-color);
    color: var(--text-color);
    border-color: #a777e3;
    box-shadow: 0 0 0 0.25rem rgba(167, 119, 227, 0.25);
}

.btn-submit {
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white;
    font-weight: bold;
    border: none;
    padding: 0.8rem;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    color: white;
}