.op-shell {
    min-height: 100vh;
}

.site-nav {
    height: var(--op-nav-height);
    border-bottom: 1px solid color-mix(in srgb, var(--op-aux-teal) 22%, var(--op-color-border));
    background: var(--op-color-surface);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
}

.op-nav-field {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    z-index: 0;
    display: block;
    width: 100%;
    height: var(--op-nav-height);
    pointer-events: none;
}

.op-page-field {
    position: fixed;
    inset: 0;
    z-index: var(--op-z-particles);
    display: block;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

body:has(.op-page-field) .op-nav-field {
    display: none;
}

.site-nav > .nav-inner,
.site-nav > .mobile-menu {
    position: relative;
    z-index: 1;
}

.nav-inner,
.footer-inner {
    width: min(
        calc(100% - (var(--op-page-gutter-desktop) * 2)),
        var(--op-layout-max)
    );
}

.site-brand,
.desktop-nav a,
.nav-actions > a,
.nav-account summary,
.menu-toggle {
    min-height: var(--op-control-min-height);
}

.site-brand {
    display: inline-flex;
    align-items: center;
}

.site-logo {
    filter: none;
}

.desktop-nav,
.nav-actions {
    gap: var(--op-space-4);
}

.desktop-nav a,
.nav-actions > a {
    display: inline-flex;
    align-items: center;
}

/* 学习中心：桌面有顶栏左侧门户菜单时不显示；与 .desktop-nav 同断点收起时才露出 */
.nav-actions > a.nav-back-portal {
    display: none;
}

.nav-cart {
    gap: var(--op-space-1);
    color: var(--op-color-text);
    text-decoration: none;
}

.nav-cart__count {
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: var(--op-radius-4);
    background: var(--op-color-action);
    color: var(--op-color-on-action);
    font-size: 12px;
    font-weight: 600;
    line-height: 16px;
    text-align: center;
}

/* 昵称高亮权益：与 is-link 同挂时需压过后者，否则只剩 ✦ 无配色 */
.nav-user.is-link.is-highlight {
    max-width: 196px;
    font-weight: 700;
    color: color-mix(in srgb, var(--op-aux-blue) 72%, var(--op-aux-teal));
}

.nav-user.is-link.is-highlight .nav-user-name {
    background: var(--op-brand-gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-user.is-link.is-highlight .nav-user-name::after {
    background: none;
    color: var(--op-aux-orange);
    -webkit-text-fill-color: currentColor;
}

.nav-user.is-link.is-highlight:hover {
    color: color-mix(in srgb, var(--op-aux-teal) 78%, #000);
}

.mobile-menu a.nav-cart {
    gap: var(--op-space-2);
}

.desktop-nav a {
    position: relative;
    padding: 0 var(--op-space-1);
    color: var(--op-color-text);
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
}

.desktop-nav a[aria-current="page"] {
    color: var(--op-aux-blue);
}

.desktop-nav a::before {
    content: "";
    position: absolute;
    top: var(--op-space-3);
    left: 0;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--op-aux-teal);
    opacity: 0;
    transform: scale(.6);
    transition:
        opacity var(--op-motion-fast) var(--op-ease-standard),
        transform var(--op-motion-fast) var(--op-ease-standard);
}

.desktop-nav a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: var(--op-space-2);
    width: 0;
    height: 2px;
    border-radius: 1px;
    background-image: var(--op-brand-gradient-text);
    transform: translateX(-50%);
    transition: width var(--op-motion-fast) var(--op-ease-standard);
}

.desktop-nav a:hover,
.desktop-nav a:focus-visible,
.footer-links a:hover {
    color: var(--op-aux-blue);
}

.desktop-nav a:hover::before,
.desktop-nav a:focus-visible::before {
    opacity: 1;
    transform: scale(1);
}

.desktop-nav a:hover::after,
.desktop-nav a:focus-visible::after,
.desktop-nav a[aria-current="page"]::after {
    width: calc(100% - var(--op-space-2));
}

.desktop-nav .op-nav-spark {
    position: absolute;
    z-index: 1;
    bottom: var(--op-space-2);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--op-aux-teal);
    pointer-events: none;
    animation: op-nav-spark var(--op-motion-normal) var(--op-ease-standard) forwards;
}

@keyframes op-nav-spark {
    from {
        opacity: .95;
        transform: translateY(0) scale(1);
    }

    to {
        opacity: 0;
        transform: translateY(-8px) scale(.4);
    }
}

@media (prefers-reduced-motion: reduce) {
    .desktop-nav .op-nav-spark,
    .op-nav-field,
    .op-page-field {
        display: none;
    }
}

.nav-account summary {
    padding: var(--op-space-2) var(--op-space-3);
    border: 0;
    border-radius: var(--op-radius-2);
    background: transparent;
}

.nav-account summary:hover,
.nav-account[open] summary {
    background: transparent;
    color: var(--op-color-text);
}

.nav-account-menu {
    top: calc(100% + var(--op-space-2));
    width: 232px;
    padding: var(--op-space-2);
    border-color: var(--op-color-border);
    border-radius: var(--op-radius-3);
    background: var(--op-color-surface);
    box-shadow: var(--op-shadow-overlay);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
}

.nav-actions .nav-account-menu a {
    display: flex;
    min-height: var(--op-control-min-height);
    padding: var(--op-space-2) var(--op-space-3);
    align-items: center;
    border-radius: var(--op-radius-2);
}

.nav-account-divider {
    margin: var(--op-space-1) var(--op-space-2);
    background: var(--op-color-border);
}

.menu-toggle {
    width: var(--op-control-min-height);
    height: var(--op-control-min-height);
    padding: var(--op-space-2);
    border-radius: var(--op-radius-2);
}

.mobile-menu {
    padding: var(--op-space-3) var(--op-page-gutter-tablet);
    gap: var(--op-space-2) var(--op-space-3);
    border-color: var(--op-color-border);
    background: var(--op-color-surface);
}

.mobile-menu a {
    display: flex;
    min-height: var(--op-control-min-height);
    padding: var(--op-space-2);
    align-items: center;
    border-radius: var(--op-radius-2);
}

.mobile-menu a:hover {
    background: var(--op-color-surface-subtle);
}

.member-shell {
    display: grid;
    width: min(
        calc(100% - (var(--op-page-gutter-desktop) * 2)),
        var(--op-layout-max)
    );
    margin: 0 auto;
    padding: calc(var(--op-nav-height) + var(--op-space-5)) 0 var(--op-space-7);
    grid-template-columns: var(--op-sidebar-width) minmax(0, 1fr);
    gap: var(--op-space-5);
}

.join-apply-shell {
    width: min(
        calc(100% - (var(--op-page-gutter-desktop) * 2)),
        var(--op-layout-max)
    );
    margin: 0 auto;
    padding: calc(var(--op-nav-height) + var(--op-space-5)) 0 var(--op-space-7);
}

.member-sidebar {
    position: sticky;
    top: calc(var(--op-nav-height) + var(--op-space-3));
    width: auto;
}

.member-sidebar-title {
    margin-bottom: var(--op-space-3);
}

.member-space-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--op-space-1);
    margin-bottom: var(--op-space-3);
}

.member-space-tab {
    display: inline-flex;
    min-height: var(--op-control-min-height);
    padding: var(--op-space-2);
    align-items: center;
    border-radius: var(--op-radius-2);
    color: var(--op-color-text-muted);
    font-size: 14px;
    font-weight: 600;
}

.member-space-tab:hover,
.member-space-tab:focus-visible {
    color: var(--op-aux-blue);
}

.member-space-tab.is-active {
    background: var(--op-color-surface-subtle);
    color: var(--op-aux-blue);
}

.member-nav {
    gap: var(--op-space-1);
}

.member-nav-label {
    margin: var(--op-space-4) 0 var(--op-space-1);
    color: var(--op-color-text-muted);
    font-size: 12px;
    font-weight: 600;
}

.member-nav-label:first-child {
    margin-top: 0;
}

.member-nav-item {
    display: flex;
    min-height: var(--op-control-min-height);
    padding: var(--op-space-2) var(--op-space-3);
    align-items: center;
    border-radius: var(--op-radius-2);
}

.member-nav-item.is-active {
    background: var(--op-color-action);
    color: var(--op-color-on-action);
}

.member-content {
    min-width: 0;
}

.site-footer {
    padding: var(--op-space-5) var(--op-page-gutter-desktop);
    border-color: var(--op-color-border);
    background: var(--op-color-surface-subtle);
    color: var(--op-color-text-muted);
}

.footer-inner {
    gap: var(--op-space-3);
}

.footer-meta {
    display: flex;
    flex-direction: column;
    gap: var(--op-space-1);
}

.site-footer__icp {
    margin: 0;
    font-size: 12px;
}

.site-footer__icp a {
    color: inherit;
    text-decoration: none;
}

.site-footer__icp a:hover {
    color: var(--op-color-text);
    text-decoration: underline;
}

.footer-links {
    display: flex;
    gap: var(--op-space-4);
    flex-wrap: wrap;
}

.footer-links a {
    display: inline-flex;
    min-height: var(--op-control-min-height);
    align-items: center;
}

.fill-prompt-modal {
    padding: var(--op-space-4);
    background: var(--op-color-overlay);
}

.fill-prompt-card {
    width: min(100%, 480px);
    padding: var(--op-space-5);
    border: 1px solid var(--op-color-border);
    border-radius: var(--op-radius-4);
    background: var(--op-color-surface);
    box-shadow: var(--op-shadow-overlay);
}

.fill-prompt-actions {
    gap: var(--op-space-3);
}

@media (max-width: 1180px) {
    .desktop-nav {
        gap: var(--op-space-3);
    }
}

@media (max-width: 1023px) {
    .op-nav-field,
    .op-page-field {
        display: none;
    }

    .nav-actions > a.nav-back-portal {
        display: inline-flex;
        align-items: center;
    }

    .nav-inner,
    .footer-inner,
    .member-shell {
        width: calc(100% - (var(--op-page-gutter-tablet) * 2));
    }

    .member-shell {
        grid-template-columns: 1fr;
        gap: var(--op-space-4);
    }

    .member-sidebar {
        position: static;
    }

    .member-nav {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: var(--op-space-2);
    }

    .member-nav-label {
        grid-column: 1 / -1;
        margin-top: var(--op-space-3);
    }
}

@media (max-width: 767px) {
    .nav-inner,
    .footer-inner,
    .member-shell {
        width: calc(100% - (var(--op-page-gutter-mobile) * 2));
    }

    .nav-actions {
        gap: var(--op-space-2);
    }

    .nav-account,
    .nav-user-name,
    .nav-actions .nav-cart__label {
        display: none;
    }

    .mobile-menu {
        grid-template-columns: 1fr;
        max-height: calc(100vh - var(--op-nav-height));
        padding-inline: var(--op-page-gutter-mobile);
        overflow-y: auto;
    }

    .member-shell {
        padding-top: calc(var(--op-nav-height) + var(--op-space-4));
        gap: var(--op-space-3);
    }

    .member-nav {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: var(--op-space-2);
        scrollbar-width: thin;
    }

    .member-nav-item {
        flex: 0 0 auto;
    }

    .footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .fill-prompt-modal {
        padding: var(--op-space-3);
    }

    .fill-prompt-card {
        padding: var(--op-space-4);
    }
}