/* biz 导航与用户下拉（biz.html）——自 biz.css 拆出守 400 行纪律 */
.biz-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(21, 32, 48, 0.72);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--sg-border);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.biz-nav.scrolled {
    background: rgba(21, 32, 48, 0.94);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.28);
}

.biz-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.biz-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--sg-text);
}

.biz-brand-logo img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: block;
}

.biz-brand-name {
    font-size: 18px;
    font-weight: 650;
    letter-spacing: 0.02em;
}

.biz-brand-tag {
    font-size: 12px;
    font-weight: 500;
    color: var(--sg-accent);
    background: var(--sg-accent-dim);
    border: 1px solid rgba(56, 189, 248, 0.25);
    padding: 3px 10px;
    border-radius: 999px;
}

.biz-nav-back {
    font-size: 13px;
    color: var(--sg-text-muted);
    text-decoration: none;
    padding: 12px 14px;
    border-radius: 10px;
    transition: color 0.2s ease, background 0.2s ease;
}

.biz-nav-back:hover {
    color: var(--sg-text);
    background: var(--sg-surface);
}

.biz-nav-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.biz-nav-login {
    font-size: 13px;
    color: var(--sg-text);
    background: var(--sg-accent);
    text-decoration: none;
    padding: 12px 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: filter 0.2s ease;
}
.biz-nav-login:hover {
    filter: brightness(1.08);
}

.biz-nav-user {
    position: relative;
}

.biz-nav-user .biz-nav-login {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--sg-surface);
    border: 1px solid var(--sg-border);
    color: var(--sg-accent);
}

.biz-user-avatar {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--sg-accent);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.biz-user-drop {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 200px;
    background: var(--sg-surface);
    border: 1px solid var(--sg-border);
    border-radius: 12px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.28);
    overflow: hidden;
    z-index: 110;
}
.biz-user-drop-id {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
}
.biz-user-drop-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--sg-accent);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
}
.biz-user-drop-meta {
    min-width: 0;
}
.biz-user-drop-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--sg-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.biz-user-drop-mail {
    font-size: 11px;
    color: var(--sg-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.biz-user-drop-sep {
    height: 1px;
    background: var(--sg-border);
}
.biz-user-drop button {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 11px 14px;
    font-size: 13px;
    color: var(--sg-text);
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: background 0.2s ease;
}
.biz-user-drop button:hover {
    background: var(--sg-hover, rgba(255, 255, 255, 0.06));
}