/* ============================================================
   [v2.0 视觉改版] 升级卡片 —— 暗色玻璃 + 稀有度辉光
   (整体替换旧的高饱和渐变卡面)
   ============================================================ */

.upgrade-card {
    width: 224px;
    min-height: 300px;
    background: linear-gradient(165deg, rgba(18, 28, 46, 0.94), rgba(9, 14, 26, 0.96));
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 14px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: transform 0.25s cubic-bezier(0.25, 0.8, 0.25, 1),
                box-shadow 0.25s ease, border-color 0.25s ease;
    position: relative;
    overflow: hidden;
    text-align: center;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(6px);
}

/* 卡面顶部流光细线 */
.upgrade-card::before {
    content: '';
    position: absolute;
    top: 0; left: 12%;
    width: 76%; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(160, 210, 255, 0.5), transparent);
    pointer-events: none;
}

.upgrade-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55) !important;
}

.upgrade-card h3 {
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 3px;
    margin: 0;
    color: #F2F6FC;
    text-shadow: none;
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 10px;
}

.upgrade-card .icon-container {
    font-size: 46px;
    height: 78px;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 14px rgba(140, 190, 255, 0.30));
}

.upgrade-card p {
    color: rgba(205, 218, 235, 0.82);
    font-size: 13px;
    line-height: 1.6;
    margin: 10px 0;
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---- 层数徽章：与卡名同行，不抢占正文 ---- */
.upgrade-card .rank-badge {
    display: inline-block;
    margin-left: 8px;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 1px;
    color: rgba(200, 214, 232, 0.55);
}

/* ---- 数值对比：一眼看到"这一选带来多少变化" ---- */
.upgrade-card .stat-preview {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 6px;
    width: 100%;
    margin: 2px 0 6px;
    font-size: 13px;
    letter-spacing: 1px;
}
.upgrade-card .stat-preview span { font-size: 11px; color: rgba(200, 214, 232, 0.6); }
.upgrade-card .stat-preview b { font-weight: 600; color: rgba(226, 236, 248, 0.92); font-variant-numeric: tabular-nums; }
.upgrade-card .stat-preview i { font-style: normal; color: rgba(200, 214, 232, 0.45); }
.upgrade-card .stat-preview b.after { color: #9BE0B6; }

.upgrade-card .type-tag {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: rgba(200, 214, 232, 0.6);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 4px 12px;
    border-radius: 20px;
    margin-top: auto;
}

/* ---- 稀有度：暗底 + 描边 + 外辉光（替代高饱和渐变） ---- */
.upgrade-card.common {
    border-color: rgba(170, 180, 195, 0.45);
}
.upgrade-card.common:hover {
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55), 0 0 24px rgba(170, 180, 195, 0.22) !important;
}

.upgrade-card.rare {
    border-color: rgba(66, 165, 245, 0.65);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), inset 0 0 30px rgba(66, 165, 245, 0.08);
}
.upgrade-card.rare:hover {
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55), 0 0 28px rgba(66, 165, 245, 0.4) !important;
}

.upgrade-card.epic {
    border-color: rgba(171, 71, 188, 0.65);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), inset 0 0 30px rgba(171, 71, 188, 0.08);
}
.upgrade-card.epic:hover {
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55), 0 0 28px rgba(171, 71, 188, 0.4) !important;
}

.upgrade-card.legendary {
    border-color: rgba(255, 213, 79, 0.7);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), inset 0 0 30px rgba(255, 213, 79, 0.08);
}
.upgrade-card.legendary:hover {
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55), 0 0 30px rgba(255, 213, 79, 0.42) !important;
}