.sidebar {
    position: fixed;
    right: 20px;
    bottom: 120px;
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.side-item {
    position: relative;
    width: var(--space-2xl);
    height: var(--space-2xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--color-text-secondary);
    font-size: var(--font-size-h2);
}

.side-item:hover {
    background: var(--color-primary);
    color: var(--color-bg-card);
    box-shadow: 0 4px 16px var(--color-primary-shadow);
    transform: translateX(-2px);
}

.side-item .icon {
    line-height: var(--line-height-btn);
}

.promo-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--color-primary);
    color: var(--color-bg-card);
    font-size: var(--font-size-mini);
    font-weight: var(--font-weight-bold);
    padding: var(--space-2xs) var(--space-sm);
    border-radius: var(--radius-lg);
    white-space: nowrap;
    box-shadow: 0 2px 8px var(--color-primary-shadow);
    z-index: var(--z-base);
    pointer-events: none;
}

.side-sub-item {
    display: none;
    position: absolute;
    right: 58px;
    top: 50%;
    transform: translateY(-50%);
    width: 150px;
    padding: var(--space-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    text-align: center;
    z-index: var(--z-modal);
}

.side-sub-item::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    border: 4px solid transparent;
    border-left-color: var(--color-bg-card);
}

.side-sub-item img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
}

.side-sub-item span {
    font-size: var(--font-size-mini);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    display: block;
}

.side-item:hover .side-sub-item {
    display: block;
    animation: fadeInRight 0.3s ease;
}

.sub-item-service {
    width: 300px;
    gap: var(--space-base);
    padding: var(--space-base);
}

.item-service:hover .sub-item-service {
    display: flex;
}

.service-qr {
    flex: var(--z-base);
    text-align: center;
}

.service-qr img {
    width: 100%;
    margin-bottom: 6px;
}

.sub-item-promotion {
    width: 360px;
    padding: 0;
    text-align: left;
    border-radius: var(--radius-lg);
    line-height: var(--line-height-caption);
    right: var(--space-2xl);
}

.promo-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
    padding: 20px 20px var(--space-lg);
    text-align: center;
    position: relative;
}

.promo-header::after {
    content: '';
    position: absolute;
    bottom: -14px;
    left: 0;
    right: 0;
    height: 28px;
    background: var(--color-bg-card);
    border-radius: 50% 50% 0 0;
}

.promo-header-icon {
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
}
.promo-header-icon i {
    font-size: var(--font-size-h2);
    color: var(--color-bg-card);
}

.promo-header-title {
    color: var(--color-bg-card);
    font-size: var(--font-size-price);
    font-weight: var(--font-weight-bold);
}

.promo-header-sub {
    color: rgba(255,255,255,0.85);
    font-size: var(--font-size-label);
    margin-top: var(--space-xs);
}

.promo-body {
    padding: var(--space-base) 20px 20px;
    position: relative;
    z-index: var(--z-base);
}

.earn-card {
    background: linear-gradient(135deg, #fff8f0 0%, var(--color-bg-card) 100%);
    border: 1px solid #ffe4d6;
    border-radius: var(--radius-lg);
    padding: var(--space-base);
    text-align: center;
    margin-bottom: 14px;
}

.earn-label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-label);
    margin-bottom: 6px;
}

.earn-rate {
    color: var(--color-primary);
    font-size: 36px;
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-btn);
    white-space: nowrap;
}

.earn-rate span {
    font-size: var(--font-size-card-title);
    font-weight: var(--font-weight-semibold);
    display: inline;
}

.earn-desc {
    color: var(--color-text-secondary);
    font-size: var(--font-size-label);
    margin-top: 6px;
}

.tip-bar {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    background: #fff8f0;
    border-radius: 6px;
    padding: 10px 14px;
    margin-bottom: var(--space-md);
}

.tip-bar i {
    font-size: var(--font-size-card-title);
    color: #e67e22;
    flex-shrink: 0;
    margin-top: var(--space-2xs);
}

.tip-bar p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-label);
    line-height: var(--line-height-caption);
    margin: 0;
}

.promo-footer {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px dashed #e8e8e8;
}

.promo-footer a {
    color: var(--color-primary);
    font-size: var(--font-size-caption);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.promo-footer a:hover {
    text-decoration: underline;
}


.sub-item-signin {
    width: 360px;
    padding: 0;
    text-align: left;
    border-radius: var(--radius-lg);
    line-height: var(--line-height-caption);
    right: var(--space-2xl);
}

.signin-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
    padding: 20px 20px var(--space-lg);
    text-align: center;
    position: relative;
}

.signin-header::after {
    content: '';
    position: absolute;
    bottom: -14px;
    left: 0;
    right: 0;
    height: 28px;
    background: var(--color-bg-card);
    border-radius: 50% 50% 0 0;
}

.signin-header-icon {
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
}

.signin-header-icon i {
    font-size: var(--font-size-h2);
    color: var(--color-bg-card);
}

.signin-header-title {
    color: var(--color-bg-card);
    font-size: var(--font-size-price);
    font-weight: var(--font-weight-bold);
}

.signin-header-sub {
    color: rgba(255,255,255,0.85);
    font-size: var(--font-size-label);
    margin-top: var(--space-xs);
}

.signin-body {
    padding: var(--space-base) 20px 20px;
    position: relative;
    z-index: var(--z-base);
}

.signin-body .earn-card {
    background: linear-gradient(135deg, #fff8f0 0%, var(--color-bg-card) 100%);
    border: 1px solid #ffe4d6;
    border-radius: var(--radius-lg);
    padding: var(--space-base);
    margin-bottom: 14px;
}

.signin-body .section-title {
    font-size: var(--font-size-btn);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-body);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: 6px;
    justify-content: flex-start;
}

.signin-body .earn-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.signin-body .earn-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
}

.signin-body .earn-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-lg);
    background: #fff8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 6px;
}

.signin-body .earn-icon i {
    font-size: var(--font-size-card-title);
    color: var(--color-primary);
}

.signin-body .earn-name {
    font-size: var(--font-size-label);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-body);
}

.signin-body .tip-bar {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    background: #fff8f0;
    border-radius: 6px;
    padding: 10px 14px;
    margin-bottom: var(--space-md);
}

.signin-body .tip-bar p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-label);
    line-height: var(--line-height-caption);
    margin: 0;
}

.signin-footer {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px dashed #e8e8e8;
}

.signin-footer a {
    color: var(--color-primary);
    font-size: var(--font-size-caption);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.signin-footer a:hover {
    text-decoration: underline;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateY(-50%) translateX(-8px);
    }
    to {
        opacity: var(--z-base);
        transform: translateY(-50%) translateX(0);
    }
}

.item-back-top {
    margin-top: var(--space-xs);
    font-size: var(--font-size-card-title);
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease;
}

.item-back-top.visible {
    visibility: visible;
    opacity: var(--z-base);
}

.item-back-top .top-text {
    display: none;
    font-size: var(--font-size-label);
    line-height: var(--line-height-h1);
    text-align: center;
    color: inherit;
    text-decoration: none;
}

.item-back-top:hover .fa-chevron-up {
    display: none;
}

.item-back-top:hover .top-text {
    display: block;
}

/* ====================== 阶段10.3：sidebar.html 内联样式提取 ====================== */
.sidebar .section-title .fa-coins {
    color: #e74c3c;
    font-size: 16px;
}
.sidebar .tip-bar .fa-circle-info {
    font-size: 16px;
    color: #e67e22;
    flex-shrink: 0;
}
.sidebar .signin-footer .fa-chevron-right,
.sidebar .promo-footer .fa-chevron-right {
    font-size: 12px;
}