.portal-membership-trigger {
    min-height: 34px;
    padding: 6px 11px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 999px;
    color: inherit;
    background: rgba(255,255,255,.12);
    cursor: pointer;
    white-space: nowrap;
}
.portal-membership-trigger:hover { background: rgba(255,255,255,.2); }
body[data-page="teacher"] .teacher-header .portal-membership-trigger {
    color: #53605c;
    background: #f7faf8;
    border-color: #dce2df;
}
body[data-page="teacher"] .teacher-header .portal-membership-trigger:hover {
    color: #17684f;
    background: #edf7f3;
    border-color: #c8ddd6;
}
.portal-membership-trigger .portal-member-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--member-tier-color, #cbd5e1); box-shadow: 0 0 0 3px rgba(255,255,255,.12); }
.portal-membership-trigger .portal-member-name { font-size: 12px; font-weight: 700; }

.portal-membership-backdrop {
    position: fixed;
    inset: 0;
    z-index: 99999;
    padding: 18px;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(15,23,42,.58);
    backdrop-filter: blur(3px);
}
.portal-membership-backdrop.active { display: flex; }
.portal-membership-dialog {
    width: min(560px, 100%);
    max-height: calc(100vh - 36px);
    overflow-y: auto;
    color: #172033;
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 28px 80px rgba(15,23,42,.34);
}
.portal-membership-hero {
    position: relative;
    padding: 25px 25px 21px;
    color: #fff;
    background: linear-gradient(135deg, var(--member-tier-color, #64748b), #17233d);
    border-radius: 18px 18px 0 0;
    overflow: hidden;
}
.portal-membership-hero::after {
    content: "";
    position: absolute;
    width: 180px;
    height: 180px;
    right: -65px;
    top: -80px;
    border: 1px solid rgba(255,255,255,.2);
    border-radius: 50%;
    box-shadow: 0 0 0 30px rgba(255,255,255,.04), 0 0 0 60px rgba(255,255,255,.025);
}
.portal-membership-close {
    position: absolute;
    z-index: 2;
    top: 14px;
    right: 14px;
    width: 34px;
    height: 34px;
    color: #fff;
    background: rgba(255,255,255,.14);
    border: 0;
    border-radius: 9px;
    font-size: 22px;
    cursor: pointer;
}
.portal-membership-kicker { display: block; margin-bottom: 7px; color: rgba(255,255,255,.72); font-size: 11px; font-weight: 750; letter-spacing: .12em; }
.portal-membership-hero h2 { margin: 0 0 7px; font-size: 25px; }
.portal-membership-hero p { margin: 0; color: rgba(255,255,255,.78); font-size: 13px; line-height: 1.55; }
.portal-membership-expiry { margin-top: 15px; display: inline-flex; padding: 5px 10px; color: #fff; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.16); border-radius: 999px; font-size: 12px; }
.portal-membership-body { padding: 22px 25px 25px; }
.portal-membership-section + .portal-membership-section { margin-top: 21px; padding-top: 20px; border-top: 1px solid #e8edf4; }
.portal-membership-section h3 { margin: 0 0 11px; color: #273248; font-size: 15px; }
.portal-membership-features { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.portal-membership-feature { padding: 9px 10px; display: flex; align-items: center; gap: 8px; color: #475467; background: #f7f9fc; border-radius: 8px; font-size: 12px; }
.portal-membership-feature::before { content: "✓"; width: 18px; height: 18px; display: grid; place-items: center; color: #047857; background: #d1fae5; border-radius: 50%; font-size: 11px; font-weight: 800; }
.portal-membership-empty { padding: 13px; color: #8a94a6; background: #f8fafc; border-radius: 8px; font-size: 13px; text-align: center; }
.portal-membership-form { display: flex; gap: 8px; }
.portal-membership-form input { min-width: 0; flex: 1; padding: 10px 12px; border: 1px solid #d7dfeb; border-radius: 8px; outline: none; text-transform: uppercase; }
.portal-membership-form input:focus { border-color: #739eea; box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.portal-membership-form button { padding: 10px 15px; color: #fff; background: #2563eb; border: 0; border-radius: 8px; font-weight: 700; cursor: pointer; }
.portal-membership-form button:disabled { opacity: .6; cursor: wait; }
.portal-membership-feedback { min-height: 19px; margin: 8px 0 0; color: #667085; font-size: 12px; }
.portal-membership-feedback.error { color: #b42318; }
.portal-membership-feedback.success { color: #047857; }

[data-membership-feature].membership-feature-locked { position: relative; opacity: .62; cursor: not-allowed !important; }
[data-membership-feature].membership-feature-locked::after { content: "会员"; margin-left: 5px; padding: 1px 5px; color: #7c3aed; background: #f3e8ff; border-radius: 999px; font-size: 9px; vertical-align: 2px; }

@media (max-width: 580px) {
    .portal-membership-trigger { padding: 6px 8px; }
    .portal-membership-trigger .portal-member-name { display: none; }
    .portal-membership-backdrop { padding: 8px; align-items: flex-end; }
    .portal-membership-dialog { max-height: 88vh; border-radius: 18px 18px 0 0; }
    .portal-membership-hero { padding: 22px 19px 18px; }
    .portal-membership-body { padding: 18px 19px 22px; }
    .portal-membership-features { grid-template-columns: 1fr; }
    .portal-membership-form { flex-direction: column; }
}