/* 前台 A+ 导航：分组下拉 + 页面壳留白 */
:root {
    --fe-navbar-height: 56px;
}

.fe-navbar__brand {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px 6px 4px;
    margin-right: 4px;
    text-decoration: none;
    color: var(--text-inverse, #fff);
    flex-shrink: 0;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.fe-navbar__brand:hover {
    background: rgba(255, 255, 255, 0.12);
    text-decoration: none;
    color: #fff;
}

.fe-navbar__brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 28px;
    padding: 0 8px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.04em;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color, #0288d1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.fe-navbar__brand-text {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.92;
}

.fe-nav-group[data-nav-group="materials"] .fe-nav-trigger::before,
.fe-nav-group[data-nav-group="videos"] .fe-nav-trigger::before {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-right: 2px;
    opacity: 0.88;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.fe-nav-group[data-nav-group="materials"] .fe-nav-trigger::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3C/svg%3E");
}

.fe-nav-group[data-nav-group="videos"] .fe-nav-trigger::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2'%3E%3Cpolygon points='5 3 19 12 5 21 5 3'/%3E%3C/svg%3E");
}

@media (max-width: 900px) {
    .fe-navbar__brand-text {
        display: none;
    }
}

.fe-body-shell {
    padding-top: var(--fe-navbar-height);
    min-height: 100vh;
    background: var(--bg-primary, #f5f7fa);
    color: var(--text-primary, #333);
}

.fe-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 3000;
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: var(--fe-navbar-height);
    padding: 0 12px;
    background: var(--primary-color, #0288d1);
    box-shadow:
        var(--shadow-sm, 0 2px 8px rgba(0, 0, 0, 0.12)),
        0 1px 0 color-mix(in srgb, #fff 18%, transparent) inset,
        0 4px 20px color-mix(in srgb, var(--primary-color, #0288d1) 35%, transparent);
    border-bottom: 1px solid color-mix(in srgb, #fff 12%, transparent);
}

.fe-navbar__primary {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    min-width: 0;
    overflow-x: auto;
    scrollbar-width: thin;
}

@media (min-width: 901px) {
    .fe-navbar__primary {
        overflow: visible;
    }
}

.fe-navbar__utilities {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    margin-left: auto;
}

.fe-nav-link,
.fe-nav-trigger {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text-inverse, #fff);
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition: background 0.2s ease;
}

.fe-nav-link:hover,
.fe-nav-trigger:hover,
.fe-nav-group.is-open .fe-nav-trigger {
    background: rgba(255, 255, 255, 0.16);
}

.fe-nav-group {
    position: relative;
    flex-shrink: 0;
}

.fe-nav-trigger__caret {
    font-size: 10px;
    opacity: 0.85;
}

.fe-nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 196px;
    max-width: min(22rem, 88vw);
    max-height: 70vh;
    overflow-y: auto;
    padding: 6px;
    padding-top: 8px;
    background: var(--bg-secondary, #fff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 10px;
    box-shadow: var(--shadow-lg, 0 8px 24px rgba(15, 23, 42, 0.15));
}

/* 桥接 trigger 与 dropdown，避免 hover 经过空隙时菜单消失 */
.fe-nav-dropdown::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8px;
    transform: translateY(-100%);
}

.fe-nav-group.is-open .fe-nav-dropdown,
.fe-nav-group:hover .fe-nav-dropdown {
    display: block;
}

.fe-nav-dropdown__item {
    display: block;
    padding: 9px 12px;
    font-size: 13px;
    color: var(--text-primary, #334155);
    text-decoration: none;
    border-radius: 8px;
    overflow: hidden;
    transition: background 0.15s ease, color 0.15s ease;
}

.fe-nav-dropdown__text {
    display: block;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

/* 仅超长项：悬停时横向滚完完整标题 */
.fe-nav-dropdown__item.is-overflow:hover .fe-nav-dropdown__text,
.fe-nav-dropdown__item.is-overflow:focus-visible .fe-nav-dropdown__text {
    text-overflow: clip;
    animation: fe-nav-marquee 5.5s ease-in-out infinite alternate;
}

@keyframes fe-nav-marquee {
    from {
        transform: translateX(0);
    }
    to {
        transform: translateX(calc(var(--fe-nav-visible, 100%) - 100%));
    }
}

@media (prefers-reduced-motion: reduce) {
    .fe-nav-dropdown__item.is-overflow:hover .fe-nav-dropdown__text,
    .fe-nav-dropdown__item.is-overflow:focus-visible .fe-nav-dropdown__text {
        animation: none;
        text-overflow: ellipsis;
    }
}

.fe-nav-dropdown__item:hover {
    background: var(--primary-light, #e3f2fd);
    color: var(--primary-color, #0288d1);
}

.fe-nav-dropdown__item.is-highlight {
    font-weight: 600;
    color: var(--primary-color, #0288d1);
}

.fe-nav-dropdown__divider {
    height: 1px;
    margin: 6px 8px;
    background: var(--border-light, #f1f5f9);
}

.fe-navbar .navbar-right-buttons {
    margin-left: 0;
    padding-right: 0;
}

#navbarAuthSlot {
    display: flex;
    align-items: center;
}

.fe-navbar-mobile-toggle {
    display: none;
    padding: 8px 10px;
    color: var(--text-inverse, #fff);
    background: rgba(255, 255, 255, 0.12);
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

@media (max-width: 900px) {
    .fe-navbar {
        flex-wrap: wrap;
        padding-bottom: 8px;
    }

    .fe-navbar-mobile-toggle {
        display: inline-flex;
    }

    .fe-navbar__primary {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        order: 3;
        max-height: 60vh;
        overflow-y: auto;
    }

    .fe-navbar__primary.is-expanded {
        display: flex;
    }

    .fe-nav-group {
        width: 100%;
    }

    .fe-nav-dropdown {
        position: static;
        display: none;
        box-shadow: none;
        border: none;
        background: rgba(255, 255, 255, 0.08);
        margin-top: 4px;
    }

    .fe-nav-group.is-open .fe-nav-dropdown {
        display: block;
    }

    .fe-nav-group:hover .fe-nav-dropdown {
        display: none;
    }

    .fe-nav-group.is-open:hover .fe-nav-dropdown {
        display: block;
    }

    .fe-nav-dropdown__item {
        color: var(--text-inverse, #fff);
    }

    .fe-nav-dropdown__item:hover {
        background: rgba(255, 255, 255, 0.12);
        color: #fff;
    }

    .fe-nav-trigger,
    .fe-nav-link {
        width: 100%;
        justify-content: space-between;
    }
}

/* ── User account menu (avatar + dropdown) ── */
.navbar-user-container {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.navbar-online-count {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: rgba(255, 255, 255, 0.82);
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.16);
    white-space: nowrap;
}

.fe-user-menu {
    position: relative;
    flex-shrink: 0;
}

.fe-user-menu__trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px 4px 4px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.fe-user-menu__trigger:hover,
.fe-user-menu.is-open .fe-user-menu__trigger {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.38);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.fe-user-menu__avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0;
    color: #fff;
    background: linear-gradient(
        145deg,
        hsl(var(--avatar-hue, 210) 68% 52%),
        hsl(calc(var(--avatar-hue, 210) + 28) 72% 42%)
    );
    box-shadow:
        0 0 0 2px rgba(255, 255, 255, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
    flex-shrink: 0;
}

.fe-user-menu__avatar--lg {
    width: 42px;
    height: 42px;
    font-size: 17px;
}

.fe-user-menu__name {
    max-width: 88px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.fe-user-menu__caret {
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid rgba(255, 255, 255, 0.85);
    transition: transform 0.2s ease;
}

.fe-user-menu.is-open .fe-user-menu__caret {
    transform: rotate(180deg);
}

.fe-user-menu__dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    padding: 6px;
    background: var(--bg-secondary, #fff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 12px;
    box-shadow:
        0 12px 40px rgba(15, 23, 42, 0.16),
        0 0 0 1px rgba(15, 23, 42, 0.04);
    z-index: 3100;
}

.fe-user-menu__dropdown::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8px;
    transform: translateY(-100%);
}

.fe-user-menu.is-open .fe-user-menu__dropdown {
    display: block;
}

.fe-user-menu__header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px 12px;
    margin-bottom: 4px;
}

.fe-user-menu__meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.fe-user-menu__meta strong {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary, #0f172a);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.fe-user-menu__role {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--primary-color, #0288d1);
    background: color-mix(in srgb, var(--primary-color, #0288d1) 12%, transparent);
    border-radius: 999px;
}

.fe-user-menu__item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    color: var(--text-primary, #334155);
    background: transparent;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    text-align: left;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.fe-user-menu__item:hover {
    background: color-mix(in srgb, var(--primary-color, #0288d1) 10%, transparent);
    color: var(--primary-color, #0288d1);
    text-decoration: none;
}

.fe-user-menu__item--danger {
    color: #dc2626;
}

.fe-user-menu__item--danger:hover {
    background: rgba(220, 38, 38, 0.08);
    color: #b91c1c;
}

.fe-user-menu__divider {
    height: 1px;
    margin: 6px 8px;
    background: var(--border-light, #f1f5f9);
}

.fe-user-menu__item-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.72;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.fe-user-menu__item-icon--profile {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2'%3E%3Cpath d='M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2'/%3E%3Ccircle cx='12' cy='7' r='4'/%3E%3C/svg%3E");
}

.fe-user-menu__item-icon--report {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3C/svg%3E");
}

.fe-user-menu__item-icon--exam {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2'%3E%3Cpath d='M22 10v6M2 10l10-5 10 5-10 5z'/%3E%3Cpath d='M6 12v5c0 1.1 2.7 2 6 2s6-.9 6-2v-5'/%3E%3C/svg%3E");
}

.fe-user-menu__item-icon--admin {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2'%3E%3Crect x='3' y='3' width='7' height='7'/%3E%3Crect x='14' y='3' width='7' height='7'/%3E%3Crect x='14' y='14' width='7' height='7'/%3E%3Crect x='3' y='14' width='7' height='7'/%3E%3C/svg%3E");
}

.fe-user-menu__item-icon--logout {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23dc2626' stroke-width='2'%3E%3Cpath d='M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4'/%3E%3Cpolyline points='16 17 21 12 16 7'/%3E%3Cline x1='21' y1='12' x2='9' y2='12'/%3E%3C/svg%3E");
}

.fe-user-menu__item:hover .fe-user-menu__item-icon--profile,
.fe-user-menu__item:hover .fe-user-menu__item-icon--report,
.fe-user-menu__item:hover .fe-user-menu__item-icon--exam,
.fe-user-menu__item:hover .fe-user-menu__item-icon--admin {
    opacity: 1;
}

.fe-user-menu__login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color, #0288d1);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.fe-user-menu__login:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.16);
    text-decoration: none;
    color: var(--primary-dark, #0277bd);
}

@media (max-width: 900px) {
    .navbar-online-count {
        display: none;
    }

    .fe-user-menu__name {
        display: none;
    }

    .fe-user-menu__trigger {
        padding: 4px;
    }

    .fe-user-menu__dropdown {
        right: 0;
        left: auto;
        min-width: 200px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .fe-user-menu__trigger,
    .fe-user-menu__caret,
    .fe-user-menu__login {
        transition: none;
    }

    .fe-user-menu__login:hover {
        transform: none;
    }
}

/* 导航栏工具区：主题切换 / 通知 — 玻璃态，避免与主色底同色 */
.fe-navbar #theme-selector {
    padding: 6px 28px 6px 10px;
    min-width: 108px;
    font-size: 12px;
    font-weight: 600;
    font-family: inherit;
    color: var(--fe-btn-solid-text, #fff);
    background: var(--fe-nav-chip-bg, rgba(255, 255, 255, 0.12));
    border: 1px solid var(--fe-nav-chip-border, rgba(255, 255, 255, 0.22));
    border-radius: 999px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 12px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    transition: background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.fe-navbar #theme-selector:hover {
    background-color: color-mix(in srgb, var(--fe-nav-chip-bg, rgba(255, 255, 255, 0.12)) 70%, #fff 30%);
    border-color: rgba(255, 255, 255, 0.38);
}

.fe-navbar #theme-selector:focus {
    outline: none;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        0 0 0 3px rgba(255, 255, 255, 0.14);
}

.fe-navbar #theme-selector option {
    background: var(--bg-secondary, #fff);
    color: var(--text-primary, #333);
}

.fe-navbar .navbar-notification-btn,
.fe-navbar .navbar-latest-notification-btn {
    background: var(--fe-nav-chip-bg, rgba(255, 255, 255, 0.12));
    border: 1px solid var(--fe-nav-chip-border, rgba(255, 255, 255, 0.22));
    border-radius: 999px;
    color: var(--fe-btn-solid-text, #fff);
}

.fe-navbar .navbar-notification-btn:hover,
.fe-navbar .navbar-latest-notification-btn:hover {
    background: color-mix(in srgb, var(--fe-nav-chip-bg, rgba(255, 255, 255, 0.12)) 70%, #fff 30%);
    border-color: rgba(255, 255, 255, 0.38);
}