:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); /* 좀 더 화사한 배경 */
    --glass-bg: rgba(255, 255, 255, 0.9);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --text-color: #1f2937;
    --header-color: #333;
    --header-p-color: #666;
    --ticket-bg: white;
    --placeholder-color: #aaa;
    --row-label-color: #333;
    --plus-color: #9ca3af;
    --bonus-label-color: #666;
    --body-bg: var(--bg-gradient);
}

body.dark-mode {
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --bg-gradient: linear-gradient(135deg, #1e293b 0%, #4a5568 100%);
    --glass-bg: rgba(30, 41, 59, 0.8);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --text-color: #e2e8f0;
    --header-color: #f1f5f9;
    --header-p-color: #94a3b8;
    --ticket-bg: #1e293b;
    --placeholder-color: #64748b;
    --row-label-color: #cbd5e1;
    --plus-color: #94a3b8;
    --bonus-label-color: #94a3b8;
}

body {
    font-family: 'Pretendard', sans-serif;
    background: var(--body-bg);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    padding: 20px;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.card {
    background: var(--glass-bg);
    width: 100%;
    max-width: 550px; /* 폭을 좀 더 넓혔습니다 */
    border-radius: 24px;
    padding: 30px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.header h1 {
    font-size: 1.8rem;
    margin: 0 0 10px 0;
    color: var(--header-color);
}

.header p {
    color: var(--header-p-color);
    margin-bottom: 25px;
    font-size: 0.95rem;
}

/* 5세트가 들어갈 영역 */
.ticket-area {
    background-color: var(--ticket-bg);
    border-radius: 16px;
    padding: 20px 15px;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.05);
    margin-bottom: 25px;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 15px;
}

.placeholder {
    color: var(--placeholder-color);
    font-size: 1rem;
    animation: pulse 2s infinite;
}

/* 한 줄(세트) 디자인 */
.lotto-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px;
    border-bottom: 1px dashed #e5e7eb;
    animation: slideIn 0.4s ease-out forwards;
    opacity: 0;
    transform: translateY(10px);
}

.lotto-row:last-child {
    border-bottom: none;
}

.row-label {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--row-label-color);
    width: 30px; /* A, B, C... 공간 */
    text-align: left;
}

.ball-group {
    display: flex;
    gap: 6px;
    align-items: center;
}

/* 공 디자인 (크기 조절) */
.ball {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: white;
    box-shadow: inset -2px -2px 5px rgba(0,0,0,0.2);
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* 보너스 구분 기호 (+) */
.plus {
    font-size: 1.2rem;
    color: var(--plus-color);
    font-weight: 300;
    margin: 0 4px;
}

.bonus-label {
    font-size: 0.7rem;
    color: var(--bonus-label-color);
    display: block;
    margin-top: 4px;
}

/* 버튼 */
.btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 18px 0;
    width: 100%;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 8px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
}

/* 애니메이션 */
@keyframes pulse {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

@keyframes slideIn {
    to { opacity: 1; transform: translateY(0); }
}

/* 모바일 대응 */
@media (max-width: 450px) {
    .ball { width: 28px; height: 28px; font-size: 0.8rem; }
    .ball-group { gap: 4px; }
    .plus { margin: 0 2px; }
    .row-label { font-size: 1rem; width: 20px; }
    .card { padding: 20px; }
}