.main-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    background: #eef2f6;
    padding: 5px;
    border-radius: 12px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.nav-btn {
    border: none;
    background: transparent;
    padding: 10px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    color: #777;
    transition: all 0.2s;
}

.nav-btn.active {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.tab-content { display: none; animation: fadeIn 0.3s ease-out; }
.tab-content.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.chart-wrapper { position: relative; height: 400px; width: 100%; }
@media (max-width: 600px) { .chart-wrapper { height: 300px; } }

.chart-controls { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; gap: 10px; }
.sub-btn-group { display: flex; gap: 5px; background: #f0f0f0; padding: 4px; border-radius: 8px; }

.sub-mode-btn {
    border: none; background: transparent; padding: 8px 16px; border-radius: 6px;
    cursor: pointer; font-size: 0.85rem; font-weight: 600; color: #666; transition: all 0.2s;
}
.sub-mode-btn.active { background: #fff; color: var(--primary); box-shadow: 0 1px 3px rgba(0,0,0,0.1); }

.album-select { padding: 6px 10px; border-radius: 6px; border: 1px solid #ddd; outline: none; display: none; font-family: 'Pretendard'; }
.album-select.show { display: block; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; margin-bottom: 30px; }
.stat-card { background: #f8f9fa; border-radius: 12px; padding: 15px; text-align: center; }
.stat-label { font-size: 0.85rem; color: #666; margin-bottom: 5px; }
.stat-value { font-size: 1.2rem; font-weight: 800; color: var(--primary); }


/* =========================================
   3. 벤다이어그램 스타일 (2-Circle: Performance vs Melody)
   ========================================= */
.venn-container-2 {
    position: relative;
    width: 100%;
    max-width: 700px;
    height: 500px;
    margin: 40px auto;
    /* 모바일 대응 축소 */
}

/* 배경 원 스타일 */
.circle-zone {
    position: absolute;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    mix-blend-mode: multiply; /* 색상 겹침 효과 */
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

/* 왼쪽 원 (강성) - 붉은 계열 */
.zone-left {
    left: 5%;
    background-color: rgba(255, 71, 87, 0.15); /* 연한 빨강 */
    border: 2px solid rgba(255, 71, 87, 0.5);
}

/* 오른쪽 원 (감성) - 파란 계열 */
.zone-right {
    right: 5%;
    background-color: rgba(46, 134, 222, 0.15); /* 연한 파랑 */
    border: 2px solid rgba(46, 134, 222, 0.5);
}

/* 라벨 스타일 */
.zone-label {
    position: absolute;
    font-weight: 900;
    font-size: 3rem;
    line-height: 1;
    color: rgba(0,0,0,0.05); /* 은은한 배경 글씨 */
    text-transform: uppercase;
    user-select: none;
    z-index: 0;
}
.zone-left .zone-label { left: 20px; text-align: left; }
.zone-right .zone-label { right: 20px; text-align: right; }
.zone-label span { font-size: 1rem; letter-spacing: 2px; }


/* 노래 태그 공통 스타일 */
.song-tag {
    position: absolute;
    font-weight: 700;
    font-size: 0.75rem;
    background: #fff;
    padding: 8px 16px;
    border-radius: 50px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    cursor: pointer;
    z-index: 10;
    text-align: center;
    color: #444;
    white-space: nowrap;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s, background 0.3s;
    border: 1px solid #eee;
}

.song-tag span {
    display: block;
    font-size: 0.7em;
    font-weight: 400;
    color: #888;
    margin-top: 2px;
    transition: color 0.2s;
}

/* Hover 효과: 제자리에서 커짐 + 색상 변화 */
.song-tag:hover {
    transform: scale(1.2); /* 기존 1.2보다 조금 더 키움 */
    z-index: 100;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    border-color: transparent;
}
.song-tag:hover span { color: rgba(255,255,255,0.9); }

/* 왼쪽 그룹 (강성) Hover - 빨강 */
.t-left:hover { background: #ff4757; color: #fff; }

/* 오른쪽 그룹 (감성) Hover - 파랑 */
.t-right:hover { background: #2e86de; color: #fff; }

/* ★ 교집합 그룹 (벅차오름) Hover - 그라데이션 ★ */
.t-center:hover { 
    background: linear-gradient(135deg, #ff4757, #2e86de); /* 빨강+파랑 그라데이션 */
    color: #fff; 
}


/* === 위치 지정 (Positioning) === */
/* 중앙 (교집합) - 세로로 배치 */
.t-center { left: 50%; transform: translateX(-50%); }
.t-center:hover { transform: translateX(-50%) scale(1.25); } /* hover시 중앙 정렬 유지하며 확대 */

.t-center.p1 { top: 15%; z-index: 15; border-color: #a29bfe; } /* Run For Roses 강조 */
.t-center.p2 { top: 28%; }
.t-center.p3 { top: 39%; }
.t-center.p4 { top: 50%; }
.t-center.p5 { top: 61%; }
.t-center.p6 { top: 72%; }
.t-center.p7 { top: 83%; font-size: 0.8rem; }

/* 왼쪽 (강성) */
.t-left { left: 18%; }
.t-left:hover { transform: translateX(-20%) scale(1.25); } /* hover시 살짝 왼쪽으로 */
.t-left.p1 { top: 25%; }
.t-left.p2 { top: 40%; left: 20%; } /* TANK는 더 왼쪽으로 */
.t-left.p3 { top: 55%; }
.t-left.p4 { top: 70%; }
.t-left.p5 { top: 82%; left: 22%; font-size: 0.8rem; }

/* 오른쪽 (감성) */
.t-right { right: 18%; }
.t-right:hover { transform: translateX(20%) scale(1.25); } /* hover시 살짝 오른쪽으로 */
.t-right.p1 { top: 30%; }
.t-right.p2 { top: 45%; right: 20%; }
.t-right.p3 { top: 60%; }
.t-right.p4 { top: 75%; right: 25%; font-size: 0.8rem; }


/* 모바일 반응형 */
@media (max-width: 650px) {
    .venn-container-2 { 
        transform: scale(0.65); 
        transform-origin: top center; 
        margin-bottom: -150px; 
        height: 600px;
    }
    .circle-zone { width: 300px; height: 300px; }
    .zone-left { left: 0; }
    .zone-right { right: 0; }
    .song-tag { padding: 6px 10px; font-size: 0.85rem; }
}