/* 贤紫研究院矩阵 · 对齐技术学院顶级 UI（覆盖 research-institute.css 旧书架样式） */
body.page-research-wide.xm-page--research {
    background: #f4f7fc !important;
}

body.page-research-wide.xm-page--research .research-hub {
    background: transparent;
}

.xm-page--research .research-hub-page.container {
    padding-bottom: 64px;
}

.xm-page--research .xc-content {
    background: #f4f7fc;
    padding-bottom: 16px;
}

.xm-page--research .ri-section-head {
    text-align: center;
    margin-bottom: 32px;
}

.xm-page--research .ri-section-head h2 {
    font-size: clamp(1.35rem, 2.8vw, 1.75rem);
    font-weight: 800;
    color: #1e293b;
    margin: 0 0 10px;
}

.xm-page--research .ri-section-head p {
    font-size: 15px;
    color: #64748b;
    margin: 0 auto;
    max-width: 640px;
    line-height: 1.75;
}

/* Hero 右栏 · 检索中心面板 */
.xm-page--research .ri-search-panel {
    background: #fff;
    border-radius: 24px;
    padding: 28px 26px 24px;
    height: 100%;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--xm-accent-border);
    box-shadow: 0 24px 64px var(--xm-accent-shadow), 0 4px 16px rgba(15, 23, 42, 0.06);
}

.xm-page--research .ri-search-panel__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
}

.xm-page--research .ri-search-panel__head h2 {
    font-size: 1.12rem;
    font-weight: 800;
    color: #1e293b;
    margin: 0;
}

.xm-page--research .ri-search-panel__head h2 i {
    color: var(--xm-accent);
    margin-right: 8px;
}

.xm-page--research .ri-search-panel__tag {
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    color: var(--xm-accent-dark);
    background: var(--xm-accent-soft);
    border: 1px solid var(--xm-accent-border);
    white-space: nowrap;
}

.xm-page--research .ri-search-panel__channel {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    margin-bottom: 18px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--xm-accent-soft) 0%, rgba(255, 255, 255, 0.95) 100%);
    border: 1px solid var(--xm-accent-border);
}

.xm-page--research .ri-search-panel__channel-icon {
    flex-shrink: 0;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #fff;
    background: linear-gradient(135deg, var(--xm-accent), var(--xm-accent-dark));
    box-shadow: 0 6px 18px var(--xm-accent-shadow);
}

.xm-page--research .ri-search-panel__channel-body {
    flex: 1;
    min-width: 0;
}

.xm-page--research .ri-search-panel__channel-body strong {
    display: block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #94a3b8;
    margin-bottom: 2px;
}

.xm-page--research .ri-search-panel__channel-body span {
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: #1e293b;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.xm-page--research .ri-search-panel__channel-count {
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 800;
    color: var(--xm-accent-dark);
    padding: 6px 10px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--xm-accent-border);
    font-variant-numeric: tabular-nums;
}

.xm-page--research .ri-search-form {
    margin: 0 0 18px;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
}

.xm-page--research .ri-search-bar {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 5px 5px 5px 14px;
    border-radius: 14px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.xm-page--research .ri-search-bar:focus-within {
    background: #fff;
    border-color: var(--xm-accent-border);
    box-shadow: 0 0 0 3px var(--xm-accent-soft);
}

.xm-page--research .ri-search-bar__icon {
    flex-shrink: 0;
    color: #94a3b8;
    font-size: 14px;
    margin-right: 10px;
}

.xm-page--research .ri-search-bar__input,
.xm-page--research .ri-search-form .research-hub-search__input {
    flex: 1;
    min-width: 0;
    width: auto;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
    color: #0f172a;
    box-shadow: none;
}

.xm-page--research .ri-search-bar__input:focus,
.xm-page--research .ri-search-form .research-hub-search__input:focus {
    outline: none;
    border: none;
    box-shadow: none;
    background: transparent;
}

.xm-page--research .ri-search-bar__input::placeholder,
.xm-page--research .ri-search-form .research-hub-search__input::placeholder {
    color: #94a3b8;
}

.xm-page--research .ri-search-bar__btn,
.xm-page--research .ri-search-form .research-hub-search__btn {
    flex-shrink: 0;
    width: auto;
    height: 40px;
    padding: 0 18px;
    border: none;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    color: #fff;
    background: linear-gradient(135deg, var(--xm-accent), var(--xm-accent-dark));
    box-shadow: 0 4px 14px var(--xm-accent-shadow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.xm-page--research .ri-search-bar__btn:hover,
.xm-page--research .ri-search-form .research-hub-search__btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px var(--xm-accent-shadow);
}

.xm-page--research .ri-search-form__status {
    margin: 10px 0 0;
    font-size: 12px;
    color: #64748b;
    line-height: 1.5;
}

.xm-page--research .ri-search-form__status strong {
    color: var(--xm-accent-dark);
    font-weight: 700;
}

.xm-page--research .ri-search-form__status a {
    margin-left: 8px;
    color: var(--xm-accent-dark);
    font-weight: 700;
    text-decoration: none;
}

.xm-page--research .ri-search-form__status a:hover {
    text-decoration: underline;
}

.xm-page--research .ri-search-tips {
    list-style: none;
    margin: 0 0 20px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.xm-page--research .ri-search-tips li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid #f1f5f9;
    font-size: 13px;
    color: #64748b;
}

.xm-page--research .ri-search-tips li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.xm-page--research .ri-search-tips li i {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: var(--xm-accent-dark);
    background: var(--xm-accent-soft);
    border: 1px solid var(--xm-accent-border);
}

.xm-page--research .ri-search-tips li span {
    font-weight: 600;
    color: #334155;
}

.xm-page--research .ri-search-panel__foot {
    margin-top: auto;
    padding-top: 4px;
}

.xm-page--research .ri-search-panel__foot p {
    font-size: 12px;
    line-height: 1.65;
    color: #64748b;
    margin: 0 0 14px;
}

.xm-page--research .ri-search-panel__links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.xm-page--research .ri-search-panel__links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 11px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.xm-page--research .ri-search-panel__links a.primary {
    color: #fff;
    background: linear-gradient(135deg, var(--xm-accent), var(--xm-accent-dark));
    box-shadow: 0 4px 14px var(--xm-accent-shadow);
}

.xm-page--research .ri-search-panel__links a.primary:hover {
    transform: translateY(-1px);
    color: #fff;
}

.xm-page--research .ri-search-panel__links a.secondary {
    color: var(--xm-accent-dark);
    background: #fff;
    border: 1px solid var(--xm-accent-border);
}

.xm-page--research .ri-search-panel__links a.secondary:hover {
    background: var(--xm-accent-soft);
    transform: translateY(-1px);
}

.xm-page--research .ri-hero__eco a[href="/tech-academy/"] {
    border-color: rgba(233, 30, 140, 0.25);
}

/* 研究院栏目网格 */
.xm-page--research .ri-channels {
    padding: 56px 0 28px;
    max-width: var(--xm-width, min(1520px, calc(100vw - 64px)));
    margin: 0 auto;
    padding-left: var(--xm-gutter, 32px);
    padding-right: var(--xm-gutter, 32px);
}

.xm-page--research .ri-channel-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
}

.xm-page--research .ri-channel-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
    padding: 20px 14px 18px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid #e8ecf1;
    text-decoration: none;
    color: #334155;
    transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    position: relative;
    overflow: hidden;
}

.xm-page--research .ri-channel-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--ch-accent, var(--xm-accent)), var(--ch-accent-end, var(--xm-accent-dark)));
    opacity: 0;
    transition: opacity 0.22s ease;
}

.xm-page--research .ri-channel-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px var(--xm-accent-shadow);
    border-color: var(--xm-accent-border);
}

.xm-page--research .ri-channel-card:hover::before,
.xm-page--research .ri-channel-card.is-active::before {
    opacity: 1;
}

.xm-page--research .ri-channel-card.is-active {
    border-color: var(--xm-accent-border);
    background: linear-gradient(180deg, #fff 0%, var(--xm-accent-soft) 100%);
    box-shadow: 0 8px 28px var(--xm-accent-shadow);
}

.xm-page--research .ri-channel-card__icon {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    background: linear-gradient(135deg, var(--ch-accent, var(--xm-accent)), var(--ch-accent-end, var(--xm-accent-dark)));
    box-shadow: 0 6px 18px var(--xm-accent-shadow);
}

.xm-page--research .ri-channel-card__title {
    font-size: 13px;
    font-weight: 700;
    line-height: 1.45;
    margin: 0;
    color: #1e293b;
}

.xm-page--research .ri-channel-card.is-active .ri-channel-card__title {
    color: var(--xm-accent-dark);
}

.xm-page--research .ri-channel-card--c1 { --ch-accent: #6366f1; --ch-accent-end: #4f46e5; }
.xm-page--research .ri-channel-card--c2 { --ch-accent: #e91e8c; --ch-accent-end: #be185d; }
.xm-page--research .ri-channel-card--c3 { --ch-accent: #0891b2; --ch-accent-end: #0e7490; }
.xm-page--research .ri-channel-card--c4 { --ch-accent: #059669; --ch-accent-end: #047857; }
.xm-page--research .ri-channel-card--c5 { --ch-accent: #d97706; --ch-accent-end: #b45309; }
.xm-page--research .ri-channel-card--c6 { --ch-accent: #7c3aed; --ch-accent-end: #6d28d9; }
.xm-page--research .ri-channel-card--c7 { --ch-accent: #dc2626; --ch-accent-end: #b91c1c; }
.xm-page--research .ri-channel-card--c8 { --ch-accent: #0d9488; --ch-accent-end: #0f766e; }
.xm-page--research .ri-channel-card--c9 { --ch-accent: #2563eb; --ch-accent-end: #1d4ed8; }

/* 文献区 · 现代卡片网格（替代拟物书架） */
.xm-page--research .research-bookshelf--modern {
    max-width: var(--xm-width, min(1520px, calc(100vw - 64px)));
    margin: 0 auto;
    padding: 16px var(--xm-gutter, 32px) 0;
    background: transparent;
}

.xm-page--research .research-bookshelf--modern .research-bookshelf__cabinet {
    position: static;
    --shelf-cols: unset;
    --shelf-gap: unset;
    --shelf-pad: unset;
    --shelf-book-inset: unset;
    border: none;
    border-radius: 24px;
    background: #fff;
    padding: 32px 28px 36px;
    overflow: visible;
    box-shadow:
        0 4px 24px rgba(15, 23, 42, 0.04),
        0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.xm-page--research .research-bookshelf--modern .research-bookshelf__cabinet::after {
    display: none !important;
}

.xm-page--research .research-bookshelf.research-bookshelf--modern {
    margin-top: 0;
    padding-top: 24px;
    background: transparent;
}

.xm-page--research .research-bookshelf--modern .research-bookshelf__header {
    display: none;
}

.xm-page--research .ri-literature__head {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px 24px;
    margin-bottom: 28px;
    padding-bottom: 22px;
    border-bottom: 1px solid #eef2f7;
}

.xm-page--research .ri-literature__title {
    margin: 0 0 6px;
    font-size: clamp(1.2rem, 2.4vw, 1.45rem);
    font-weight: 800;
    color: #1e293b;
    display: flex;
    align-items: center;
    gap: 10px;
}

.xm-page--research .ri-literature__title i {
    color: var(--xm-accent);
}

.xm-page--research .ri-literature__sub {
    margin: 0;
    font-size: 13px;
    color: #64748b;
    line-height: 1.6;
}

.xm-page--research .ri-literature__head-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.xm-page--research .ri-literature__pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: #64748b;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
}

.xm-page--research .ri-literature__pill i {
    color: var(--xm-accent);
    font-size: 11px;
}

.xm-page--research .ri-literature__pill strong {
    color: var(--xm-accent-dark);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.xm-page--research .ri-literature__pill--filter {
    color: var(--xm-accent-dark);
    background: var(--xm-accent-soft);
    border-color: var(--xm-accent-border);
}

.xm-page--research .ri-literature__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.xm-page--research .ri-lit-card.research-book {
    position: relative;
    display: flex;
    flex-direction: column;
    width: auto;
    max-width: none;
    margin: 0;
    padding: 0;
    perspective: none;
    cursor: default;
    background: #fff;
    border-radius: 20px;
    border: 1px solid #e8ecf1;
    min-height: 0;
    overflow: hidden;
    transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

.xm-page--research .ri-lit-card.research-book:hover {
    transform: translateY(-6px);
    box-shadow: 0 22px 52px var(--xm-accent-shadow);
    border-color: var(--xm-accent-border);
}

.xm-page--research .ri-lit-card.research-book:hover .research-book__volume,
.xm-page--research .ri-lit-card.research-book:focus-within .research-book__volume,
.xm-page--research .ri-lit-card.research-book.is-pulling .research-book__volume {
    transform: none !important;
    filter: none !important;
}

.xm-page--research .ri-lit-card .research-book__volume {
    display: none !important;
}

.xm-page--research .ri-lit-card__cover {
    position: relative;
    height: 168px;
    overflow: hidden;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.xm-page--research .ri-lit-card__cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.xm-page--research .ri-lit-card__cover-spine {
    position: relative;
    height: 100%;
    padding: 22px 20px 18px 28px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    color: #fff;
    background: linear-gradient(145deg, var(--lit-cover-a, #6366f1) 0%, var(--lit-cover-b, #4f46e5) 52%, var(--lit-cover-c, #312e81) 100%);
    box-shadow: inset 4px 0 12px rgba(0, 0, 0, 0.18);
}

.xm-page--research .ri-lit-card__cover-spine::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 14px;
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.28), rgba(255, 255, 255, 0.08) 40%, transparent);
}

.xm-page--research .ri-lit-card__cover-spine::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.14) 0%, transparent 38%, rgba(0, 0, 0, 0.12) 100%);
    pointer-events: none;
}

.xm-page--research .ri-lit-card__cover-label {
    position: relative;
    z-index: 1;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.18em;
    opacity: 0.82;
    margin-bottom: 10px;
}

.xm-page--research .ri-lit-card__cover-title {
    position: relative;
    z-index: 1;
    margin: 0;
    font-size: 15px;
    font-weight: 800;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.xm-page--research .ri-lit-card__badge {
    position: absolute;
    top: 14px;
    right: 14px;
    z-index: 2;
    font-size: 10px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
    backdrop-filter: blur(8px);
}

.xm-page--research .ri-lit-card__badge--free {
    background: rgba(236, 253, 245, 0.92);
    color: #047857;
    border: 1px solid #a7f3d0;
}

.xm-page--research .ri-lit-card__badge--paid {
    background: rgba(254, 243, 199, 0.92);
    color: #b45309;
    border: 1px solid #fde68a;
}

.xm-page--research .ri-lit-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 18px 20px 20px;
}

.xm-page--research .ri-lit-card .research-book__panel {
    position: static;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    pointer-events: auto !important;
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
    background: transparent !important;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.xm-page--research .ri-lit-card__type {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--lit-accent, var(--xm-accent-dark));
    margin-bottom: 8px;
}

.xm-page--research .ri-lit-card .research-book__panel-title {
    font-size: 15px;
    font-weight: 800;
    color: #1e293b;
    line-height: 1.45;
    margin: 0 0 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.xm-page--research .ri-lit-card .research-book__panel-excerpt {
    font-size: 13px;
    line-height: 1.7;
    color: #64748b;
    margin: 0 0 14px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.xm-page--research .ri-lit-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid #f1f5f9;
}

.xm-page--research .ri-lit-card .research-book__panel-meta {
    font-size: 12px;
    color: #94a3b8;
    margin: 0;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.xm-page--research .ri-lit-card .research-book__panel-meta i {
    color: var(--xm-accent);
    margin-right: 4px;
}

.xm-page--research .ri-lit-card .research-hub-btn,
.xm-page--research .ri-lit-card .pay-button {
    flex-shrink: 0;
    margin: 0;
    width: auto;
    justify-content: center;
    border-radius: 10px;
    padding: 9px 16px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.xm-page--research .ri-lit-card .research-hub-btn--free,
.xm-page--research .ri-lit-card .pay-button[data-name="免费查看"] {
    background: linear-gradient(135deg, var(--xm-accent), var(--xm-accent-dark));
    color: #fff;
    box-shadow: 0 4px 14px var(--xm-accent-shadow);
}

.xm-page--research .ri-lit-card .research-hub-btn--paid,
.xm-page--research .ri-lit-card .pay-button[data-name="付费查看"] {
    background: #fff;
    color: var(--xm-accent-dark);
    border: 1px solid var(--xm-accent-border);
}

.xm-page--research .ri-lit-card .pay-button:hover {
    transform: translateY(-1px);
}

/* 书封配色 · nth-child 避免 cycle 输出数字 */
.xm-page--research .ri-literature__grid > .ri-lit-card:nth-child(6n+1) {
    --lit-accent: #6366f1;
    --lit-cover-a: #6366f1;
    --lit-cover-b: #4f46e5;
    --lit-cover-c: #312e81;
}

.xm-page--research .ri-literature__grid > .ri-lit-card:nth-child(6n+2) {
    --lit-accent: #e91e8c;
    --lit-cover-a: #e91e8c;
    --lit-cover-b: #be185d;
    --lit-cover-c: #831843;
}

.xm-page--research .ri-literature__grid > .ri-lit-card:nth-child(6n+3) {
    --lit-accent: #0891b2;
    --lit-cover-a: #0891b2;
    --lit-cover-b: #0e7490;
    --lit-cover-c: #164e63;
}

.xm-page--research .ri-literature__grid > .ri-lit-card:nth-child(6n+4) {
    --lit-accent: #059669;
    --lit-cover-a: #059669;
    --lit-cover-b: #047857;
    --lit-cover-c: #064e3b;
}

.xm-page--research .ri-literature__grid > .ri-lit-card:nth-child(6n+5) {
    --lit-accent: #d97706;
    --lit-cover-a: #d97706;
    --lit-cover-b: #b45309;
    --lit-cover-c: #78350f;
}

.xm-page--research .ri-literature__grid > .ri-lit-card:nth-child(6n+6) {
    --lit-accent: #7c3aed;
    --lit-cover-a: #7c3aed;
    --lit-cover-b: #6d28d9;
    --lit-cover-c: #4c1d95;
}

.xm-page--research .research-bookshelf--modern .research-bookshelf__wall,
.xm-page--research .research-bookshelf--modern .research-bookshelf__plank,
.xm-page--research .research-bookshelf--modern .research-bookshelf__shelf {
    display: none !important;
}

.xm-page--research .research-empty--shelf {
    grid-column: 1 / -1;
    background: linear-gradient(180deg, #f8fafc 0%, #fff 100%);
    border-radius: 20px;
    border: 1px dashed #cbd5e1;
    padding: 56px 24px;
    margin: 0;
    color: #64748b;
}

.xm-page--research .research-empty--shelf .fa-book-open {
    font-size: 40px;
    color: var(--xm-accent-muted);
    margin-bottom: 16px;
}

.xm-page--research .research-empty__title {
    color: #1e293b;
    font-weight: 800;
}

.xm-page--research .research-empty__hint {
    color: #64748b;
}

.xm-page--research .research-empty__hint a {
    color: var(--xm-accent-dark);
}

.xm-page--research .research-hub-pagination {
    max-width: var(--xm-width);
    margin: 32px auto 0;
    padding: 0 var(--xm-gutter, 32px);
}

@media (max-width: 1200px) {
    .xm-page--research .ri-channel-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .xm-page--research .ri-literature__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 960px) {
    .xm-page--research .ri-channel-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .xm-page--research .ri-literature__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .xm-page--research .ri-channel-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .xm-page--research .ri-literature__grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 文献阅读器 · 浅色现代风格（覆盖 research-institute.css 深色拟物） ========== */
.xm-page--research .research-book-flip__veil {
    background:
        radial-gradient(ellipse 90% 70% at 50% 0%, rgba(99, 102, 241, 0.14) 0%, transparent 58%),
        radial-gradient(ellipse 60% 50% at 90% 80%, rgba(124, 58, 237, 0.08) 0%, transparent 55%),
        linear-gradient(180deg, #eef2ff 0%, #f4f7fc 48%, #f8fafc 100%);
    backdrop-filter: blur(10px);
}

.xm-page--research .research-book-flip__glow {
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.2) 0%, transparent 68%);
}

.xm-page--research .research-book-flip__status {
    color: var(--xm-accent-dark);
    text-shadow: none;
    letter-spacing: 0.06em;
    font-weight: 700;
}

.xm-page--research .research-book-flip__block {
    filter: drop-shadow(0 20px 40px rgba(99, 102, 241, 0.22));
}

.xm-page--research .research-book-flip__cover--front.research-book-flip__tone--tone-1,
.xm-page--research .research-book-flip__cover--front[class*="tone-1"] {
    background: linear-gradient(145deg, #6366f1 0%, #4f46e5 52%, #312e81 100%);
}

.xm-page--research .research-book-flip__cover--front.research-book-flip__tone--tone-2,
.xm-page--research .research-book-flip__cover--front[class*="tone-2"] {
    background: linear-gradient(145deg, #e91e8c 0%, #be185d 52%, #831843 100%);
}

.xm-page--research .research-book-flip__cover--front.research-book-flip__tone--tone-3,
.xm-page--research .research-book-flip__cover--front[class*="tone-3"] {
    background: linear-gradient(145deg, #0891b2 0%, #0e7490 52%, #164e63 100%);
}

.xm-page--research .research-book-flip__cover--front.research-book-flip__tone--tone-4,
.xm-page--research .research-book-flip__cover--front[class*="tone-4"] {
    background: linear-gradient(145deg, #059669 0%, #047857 52%, #064e3b 100%);
}

.xm-page--research .research-book-flip__cover--front.research-book-flip__tone--tone-5,
.xm-page--research .research-book-flip__cover--front[class*="tone-5"] {
    background: linear-gradient(145deg, #d97706 0%, #b45309 52%, #78350f 100%);
}

.xm-page--research .research-book-flip__cover--front.research-book-flip__tone--tone-6,
.xm-page--research .research-book-flip__cover--front[class*="tone-6"] {
    background: linear-gradient(145deg, #7c3aed 0%, #6d28d9 52%, #4c1d95 100%);
}

.xm-page--research .research-book-flip__reader {
    width: min(860px, 94vw);
    gap: 10px;
}

.xm-page--research .research-book-flip__reader-bar {
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    border-radius: 14px;
    border: 1px solid var(--xm-accent-border);
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
}

.xm-page--research .research-book-flip__back {
    color: var(--xm-accent-dark);
    text-shadow: none;
    font-weight: 700;
}

.xm-page--research .research-book-flip__back:hover {
    color: var(--xm-accent-mid);
}

.xm-page--research .research-book-flip__close {
    border: none;
    background: linear-gradient(135deg, var(--xm-accent), var(--xm-accent-dark));
    color: #fff;
    font-weight: 700;
    box-shadow: 0 4px 14px var(--xm-accent-shadow);
}

.xm-page--research .research-book-flip__close:hover {
    background: linear-gradient(135deg, var(--xm-accent-dark), var(--xm-accent-mid));
    border-color: transparent;
}

.xm-page--research .research-book-flip__spread {
    grid-template-columns: 1fr;
    filter: none;
}

.xm-page--research .research-book-flip__spread-edge {
    display: none;
}

.xm-page--research .research-book-flip__spread-inner {
    background: #fff;
    border-radius: 18px;
    border: 1px solid var(--xm-accent-border);
    box-shadow:
        0 24px 64px var(--xm-accent-shadow),
        0 4px 16px rgba(15, 23, 42, 0.06);
    grid-template-columns: 52px 1fr 52px;
    overflow: hidden;
}

.xm-page--research .research-book-flip__page-layer {
    background: #fff;
    box-shadow: none;
}

.xm-page--research .research-book-flip__page-layer .research-detail-sheet,
.xm-page--research .research-book-flip__page-sheet {
    padding: 28px 32px 32px;
}

.xm-page--research .research-book-flip__page-layer .research-detail-category {
    color: var(--xm-accent-dark) !important;
}

.xm-page--research .research-book-flip__turn-zone {
    width: 40px;
    height: 72px;
    border-radius: 12px;
    background: var(--xm-accent-soft);
    color: var(--xm-accent-dark);
    border: 1px solid var(--xm-accent-border);
}

.xm-page--research .research-book-flip__turn-zone:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--xm-accent), var(--xm-accent-dark));
    color: #fff;
    border-color: transparent;
}

.xm-page--research .research-book-flip__turn-zone:disabled {
    opacity: 0.35;
}

.xm-page--research .research-book-flip__pager-bar {
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid var(--xm-accent-border);
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.04);
}

.xm-page--research .research-book-flip__pager-indicator {
    color: var(--xm-accent-dark);
    letter-spacing: 0.04em;
}

.xm-page--research .research-book-flip__pager-hint {
    color: #64748b;
}

.xm-page--research .research-book-flip__spread-inner .new-data a,
.xm-page--research .research-book-flip__page-layer .research-detail-sheet .new-data a {
    color: var(--xm-accent-dark);
}

@media (max-width: 768px) {
    .xm-page--research .research-book-flip__reader {
        width: 96vw;
    }

    .xm-page--research .research-book-flip__spread-inner {
        grid-template-columns: 40px 1fr 40px;
        border-radius: 14px;
    }

    .xm-page--research .research-book-flip__page-layer .research-detail-sheet,
    .xm-page--research .research-book-flip__page-sheet {
        padding: 20px 16px 24px;
    }

    .xm-page--research .research-book-flip__turn-zone {
        width: 32px;
        height: 56px;
    }
}