/* -------- 页面主体 -------- */
.sponsor-section {
    padding: 2.5rem 0 4rem;
    background: #f8faff;
}

.sponsor-card {
    background: #ffffff;
    border-radius: 1.5rem;
    padding: 2.8rem 3.2rem;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
}

/* 头部 */
.sponsor-header {
    text-align: center;
    padding-bottom: 1.8rem;
    border-bottom: 2px solid #e9edf4;
    margin-bottom: 2rem;
}
.sponsor-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: #0b1a33;
    margin-bottom: 0.3rem;
}
.sponsor-header h1 i {
    color: #f59e0b;
}
.sponsor-header p {
    color: #6c7a8a;
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* -------- 赞助等级卡片 -------- */
.tier-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
    margin: 1.5rem 0 2rem;
}
.tier-card {
    background: #f8faff;
    border-radius: 1rem;
    padding: 1.5rem 1rem;
    text-align: center;
    border: 1px solid #e9edf4;
    transition: all 0.3s ease;
}
.tier-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 106, 205, 0.08);
    border-color: rgba(0, 106, 205, 0.15);
}
.tier-card .tier-icon {
    font-size: 2.2rem;
    margin-bottom: 0.4rem;
}
.tier-card .tier-name {
    font-weight: 700;
    color: #0b1a33;
    font-size: 1.05rem;
}
.tier-card .tier-amount {
    font-size: 1.4rem;
    font-weight: 700;
    color: #006ACD;
    margin: 0.2rem 0;
}
.tier-card .tier-amount small {
    font-size: 0.8rem;
    font-weight: 400;
    color: #6c7a8a;
}
.tier-card .tier-desc {
    font-size: 0.85rem;
    color: #6c7a8a;
    margin-bottom: 0.6rem;
}
.tier-card .tier-perk {
    font-size: 0.8rem;
    color: #4b5a6a;
    line-height: 1.6;
}
.tier-card .tier-perk i {
    color: #22c55e;
    margin-right: 4px;
}
.tier-card.featured {
    border-color: #006ACD;
    background: #f0f6fe;
    position: relative;
    overflow: hidden;
}
.tier-card.featured::before {
    content: '推荐';
    position: absolute;
    top: 8px;
    right: -24px;
    background: #006ACD;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.15rem 2.2rem;
    transform: rotate(45deg);
    letter-spacing: 0.5px;
}
.tier-card .btn-tier {
    margin-top: 0.8rem;
    background: #006ACD;
    border: none;
    color: #fff;
    padding: 0.3rem 1.6rem;
    border-radius: 60px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: 0.2s;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.tier-card .btn-tier:hover {
    background: #0052a3;
    box-shadow: 0 4px 12px rgba(0, 106, 205, 0.25);
}
.tier-card .btn-tier.outline {
    background: transparent;
    border: 1px solid #006ACD;
    color: #006ACD;
}
.tier-card .btn-tier.outline:hover {
    background: rgba(0, 106, 205, 0.06);
}

/* -------- 赞助方式 -------- */
.method-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin: 1.5rem 0 2rem;
}
.method-item {
    background: #f8faff;
    border-radius: 1rem;
    padding: 1.8rem 1.2rem;
    text-align: center;
    border: 1px solid #e9edf4;
    transition: 0.25s ease;
}
.method-item:hover {
    border-color: #006ACD;
    box-shadow: 0 4px 16px rgba(0, 106, 205, 0.06);
}
.method-item .method-icon {
    font-size: 2.8rem;
    color: #006ACD;
    margin-bottom: 0.4rem;
}
.method-item .method-name {
    font-weight: 600;
    color: #0b1a33;
    font-size: 1.05rem;
}
.method-item .method-desc {
    font-size: 0.85rem;
    color: #6c7a8a;
    margin-top: 0.2rem;
}
.method-item .method-account {
    font-size: 0.9rem;
    font-weight: 500;
    color: #1e293b;
    background: #e9edf4;
    padding: 0.2rem 1rem;
    border-radius: 20px;
    display: inline-block;
    margin-top: 0.4rem;
    font-family: monospace;
    word-break: break-all;
}

/* -------- 鸣谢墙 -------- */
.thanks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
    margin: 1.2rem 0 1.5rem;
}
.thanks-item {
    background: #f8faff;
    border-radius: 0.8rem;
    padding: 0.8rem 0.6rem;
    text-align: center;
    border: 1px solid #e9edf4;
    transition: 0.2s;
}
.thanks-item:hover {
    border-color: #dde2eb;
    background: #f0f4fa;
}
.thanks-item .thanks-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #dde2eb;
    margin: 0 auto 0.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: #4b5a6a;
}
.thanks-item .thanks-name {
    font-weight: 500;
    color: #0b1a33;
    font-size: 0.9rem;
}
.thanks-item .thanks-tier {
    font-size: 0.7rem;
    color: #8a98a8;
}
.thanks-item .thanks-tier .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-right: 4px;
}
.thanks-item .thanks-tier .dot.gold {
    background: #f59e0b;
}
.thanks-item .thanks-tier .dot.silver {
    background: #9ca3af;
}
.thanks-item .thanks-tier .dot.bronze {
    background: #d97706;
}
.thanks-item .thanks-tier .dot.copper {
    background: #b45309;
}

/* -------- FAQ -------- */
.faq-list {
    margin: 1.2rem 0 1.5rem;
}
.faq-item {
    border-bottom: 1px solid #e9edf4;
    padding: 0.8rem 0;
}
.faq-item:last-child {
    border-bottom: none;
}
.faq-item .faq-q {
    font-weight: 600;
    color: #0b1a33;
    font-size: 0.98rem;
    display: flex;
    gap: 0.6rem;
    align-items: center;
    cursor: pointer;
    user-select: none;
}
.faq-item .faq-q i {
    color: #006ACD;
    font-size: 1.1rem;
    transition: 0.2s;
}
.faq-item .faq-q .arrow {
    margin-left: auto;
    transition: 0.2s;
}
.faq-item .faq-q .arrow.open {
    transform: rotate(180deg);
}
.faq-item .faq-a {
    font-size: 0.92rem;
    color: #4b5a6a;
    line-height: 1.7;
    padding-left: 1.8rem;
    padding-top: 0.3rem;
    display: none;
}
.faq-item .faq-a.open {
    display: block;
}

/* -------- 底部按钮 -------- */
.sponsor-footer {
    margin-top: 2.5rem;
    padding-top: 1.8rem;
    border-top: 1px solid #e9edf4;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.sponsor-footer .btn-back {
    background: #e9edf4;
    border: none;
    padding: 0.6rem 2.4rem;
    border-radius: 60px;
    font-weight: 500;
    color: #1e293b;
    transition: 0.2s;
    text-decoration: none;
}
.sponsor-footer .btn-back:hover {
    background: #dde2eb;
}
.sponsor-footer .btn-sponsor {
    background: #006ACD;
    border: none;
    padding: 0.6rem 2.4rem;
    border-radius: 60px;
    font-weight: 500;
    color: #fff;
    transition: 0.2s;
    text-decoration: none;
}
.sponsor-footer .btn-sponsor:hover {
    background: #0052a3;
    box-shadow: 0 4px 16px rgba(0, 106, 205, 0.25);
}

/* -------- 响应式 -------- */
@media (max-width: 991.98px) {
    .tier-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .method-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 767.98px) {
    .sponsor-card {
        padding: 1.8rem 1.2rem;
    }
    .sponsor-header h1 {
        font-size: 1.5rem;
    }
    .tier-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.8rem;
    }
    .tier-card {
        padding: 1rem 0.8rem;
    }
    .tier-card .tier-amount {
        font-size: 1.2rem;
    }
    .method-grid {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }
    .method-item {
        padding: 1.2rem 1rem;
    }
    .thanks-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    .sponsor-footer {
        flex-direction: column;
        align-items: center;
    }
    .sponsor-footer .btn-back,
    .sponsor-footer .btn-sponsor {
        width: 100%;
        text-align: center;
    }
}
@media (max-width: 575.98px) {
    .sponsor-card {
        padding: 1.2rem 0.8rem;
    }
    .sponsor-header h1 {
        font-size: 1.2rem;
    }
    .tier-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.6rem;
    }
    .tier-card {
        padding: 0.8rem 0.5rem;
    }
    .tier-card .tier-name {
        font-size: 0.9rem;
    }
    .tier-card .tier-amount {
        font-size: 1rem;
    }
    .tier-card .tier-desc {
        font-size: 0.75rem;
    }
    .tier-card .tier-perk {
        font-size: 0.7rem;
    }
    .tier-card .btn-tier {
        font-size: 0.75rem;
        padding: 0.2rem 1rem;
    }
    .method-item .method-icon {
        font-size: 2.2rem;
    }
    .thanks-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
    .thanks-item .thanks-avatar {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }
    .thanks-item .thanks-name {
        font-size: 0.8rem;
    }
}


.method-item .qr-section {
    margin-top: 0.8rem;
    display: flex;
    justify-content: center;
}
.method-item .qr-img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid #e9edf4;
    background: #fff;
    padding: 4px;
}
.method-item .qr-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 8px;
    border: 2px dashed #dde2eb;
    background: #f8faff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: #8a98a8;
    transition: 0.2s;
}
.method-item .qr-placeholder i {
    font-size: 3rem;
    color: #006ACD;
}
.method-item .qr-placeholder span {
    font-size: 0.7rem;
    color: #8a98a8;
}
.method-item .qr-placeholder:hover {
    border-color: #006ACD;
    background: #f0f6fe;
}