.paper-page {
    width: min(1240px, 94%);
    margin: 0 auto;
    padding: 1.2rem 0 2.2rem;
}

.paper-header h1 {
    margin: 0.25rem 0 0.45rem;
    color: #1f3f66;
    font-size: 2rem;
}

.paper-header p {
    margin: 0;
    color: #50637a;
    line-height: 1.6;
}

.paper-header p a,
.paper-header p a:visited,
.paper-header p a:hover,
.paper-header p a:focus {
    color: #3f648f;
    text-decoration: none;
}

.paper-header p a:hover,
.paper-header p a:focus {
    color: #2f5178;
}

.paper-source-icon-link {
    display: inline-flex;
    align-items: center;
    margin-left: 0.2rem;
}

.paper-source-icon-link i {
    font-size: 0.86em;
}

.paper-header .breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 0.9rem;
    color: #6b7f98;
    margin-bottom: 0.7rem;
}

.paper-header .breadcrumb a,
.paper-header .breadcrumb a:visited {
    color: #4a6da7;
    text-decoration: none;
    font-weight: 600;
}

.paper-header .breadcrumb a:hover {
    color: #3a5a8a;
}

.paper-header .breadcrumb i {
    font-size: 0.78rem;
    color: #8ca0ba;
}

.paper-controls {
    margin-top: 1.1rem;
    display: grid;
    grid-template-columns: minmax(220px, 1.5fr) minmax(150px, 180px) minmax(150px, 180px) auto;
    gap: 0.62rem;
    align-items: center;
}

.paper-search-wrap {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    border: 1px solid rgba(122, 150, 186, 0.62);
    border-radius: 10px;
    background: #fff;
    padding: 0 0.4rem 0 0.62rem;
    height: 44px;
    box-sizing: border-box;
    transition: all 0.2s ease;
}

.paper-search-wrap:focus-within {
    border-color: rgba(122, 150, 186, 0.82);
    box-shadow: 0 0 0 2px rgba(74, 109, 167, 0.16);
    background: #fdfefe;
}

.paper-search-wrap > i {
    color: #6a83a3;
    font-size: 0.9rem;
}

.paper-search-wrap input {
    border: 0;
    outline: 0;
    width: 100%;
    height: 100%;
    font-size: 0.95rem;
    background: transparent;
    line-height: 1.2;
    box-sizing: border-box;
    color: #2f4f72;
    margin-right: 0.1rem;
}

.paper-search-wrap input::placeholder {
    color: #6f86a4;
}

.paper-search-btn {
    width: 34px;
    height: 34px;
    border-radius: 999px;
    border: 1px solid #4a6da7;
    background: #4a6da7;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex: 0 0 auto;
    margin-left: auto;
}

.paper-search-btn:hover {
    border-color: #3a5a8a;
    background: #3a5a8a;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(43, 71, 107, 0.22);
}

.paper-search-btn:focus-visible {
    outline: 2px solid rgba(74, 109, 167, 0.32);
    outline-offset: 2px;
}

.paper-search-btn i {
    color: #fff;
}

.paper-controls select {
    height: 44px;
    border: 1px solid rgba(122, 150, 186, 0.62);
    border-radius: 10px;
    padding: 0 2rem 0 0.7rem;
    font-size: 0.92rem;
    color: #345a84;
    background: #fff;
    line-height: 1.2;
    box-sizing: border-box;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, #6c84a0 50%),
        linear-gradient(135deg, #6c84a0 50%, transparent 50%);
    background-position:
        calc(100% - 16px) 18px,
        calc(100% - 11px) 18px;
    background-size: 5px 5px, 5px 5px;
    background-repeat: no-repeat;
}

.paper-refresh-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-height: 44px;
    padding: 0 1rem;
    border: 1px solid rgba(93, 127, 176, 0.62);
    border-radius: 12px;
    color: #2f5e95;
    font-weight: 700;
    background: linear-gradient(180deg, rgba(103, 137, 184, 0.12), rgba(86, 122, 172, 0.09));
    cursor: pointer;
}

.paper-refresh-btn:disabled {
    cursor: wait;
    opacity: 0.65;
}

.paper-meta {
    margin-top: 0.9rem;
    color: #5a7290;
    font-size: 0.9rem;
}

.paper-stats {
    margin-top: 0.75rem;
    display: grid;
    gap: 0.6rem;
}

.paper-filter-row {
    display: grid;
    gap: 0.4rem;
}

.paper-filter-row-title {
    font-size: 0.84rem;
    font-weight: 700;
    color: #4b688a;
}

.paper-filter-row-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.paper-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.32rem 0.6rem;
    border-radius: 999px;
    border: 1px solid rgba(136, 163, 191, 0.58);
    background: #fff;
    color: #3e628c;
    font-size: 0.82rem;
}

.paper-filter-chip {
    cursor: pointer;
    transition: all 0.18s ease;
}

.paper-filter-chip:hover {
    background: #f2f8ff;
}

.paper-filter-chip.is-active {
    border-color: #4a6da7;
    background: #4a6da7;
    color: #fff;
}

.paper-list {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 0.9rem;
}

.paper-card {
    border: 1px solid rgba(145, 171, 203, 0.62);
    border-radius: 14px;
    background: #fff;
    padding: 0.9rem 0.95rem;
    box-shadow: 0 12px 24px -24px rgba(43, 71, 107, 0.52);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.paper-card-skeleton {
    cursor: default;
    pointer-events: none;
}

.paper-skeleton-line,
.paper-skeleton-chip {
    background: linear-gradient(90deg, #e9f0f8 0%, #f5f8fc 50%, #e9f0f8 100%);
    background-size: 220% 100%;
    animation: paper-skeleton-shimmer 1.2s linear infinite;
}

.paper-skeleton-line {
    border-radius: 8px;
    height: 12px;
}

.paper-skeleton-title {
    height: 18px;
    width: 78%;
}

.paper-skeleton-meta {
    width: 62%;
    margin-top: 0.35rem;
}

.paper-skeleton-chip {
    width: 66px;
    height: 24px;
    border: 0;
}

.paper-skeleton-abstract {
    width: 100%;
    margin-top: 0.75rem;
}

@keyframes paper-skeleton-shimmer {
    0% { background-position: 220% 0; }
    100% { background-position: -220% 0; }
}

.paper-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px -24px rgba(43, 71, 107, 0.66);
    border-color: rgba(115, 146, 184, 0.72);
}

.paper-card:focus-visible {
    outline: 2px solid #4a6da7;
    outline-offset: 2px;
}

.paper-card h3 {
    margin: 0;
    font-size: 1rem;
    line-height: 1.45;
    color: #1f3f66;
}

.paper-card h3 a {
    color: inherit;
    text-decoration: none;
}

.paper-card h3 a:hover {
    text-decoration: underline;
}

.paper-card-meta {
    margin-top: 0.55rem;
    color: #5d7593;
    font-size: 0.83rem;
    line-height: 1.5;
}

.paper-tags {
    margin-top: 0.6rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.paper-tag {
    background: #eef5ff;
    color: #305f95;
    border: 1px solid #d4e4f6;
    border-radius: 999px;
    font-size: 0.78rem;
    padding: 0.2rem 0.5rem;
}

.paper-tag-keyword {
    background: #f7fbff;
    color: #36577d;
    border-color: #d9e7f5;
}

.paper-keywords {
    margin-top: 0.55rem;
}

.paper-keywords strong {
    display: inline-block;
    margin-bottom: 0.35rem;
    color: #526f91;
    font-size: 0.78rem;
}

.paper-empty {
    grid-column: 1 / -1;
    padding: 1rem;
    border-radius: 12px;
    border: 1px dashed rgba(144, 171, 202, 0.76);
    color: #5f7591;
    background: rgba(255, 255, 255, 0.8);
    text-align: center;
}

.paper-pagination {
    margin-top: 2.5rem;
    display: flex;
    justify-content: center;
    border-top: 1px solid var(--border-color, rgba(140, 168, 198, 0.15));
    padding-top: 1.5rem;
}

.paper-pagination .dr-pagination {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    flex-wrap: wrap;
}

.paper-pagination .dr-page-btn,
.paper-pagination .dr-page-nav {
    border: 1px solid var(--dr-border-soft, #d8e1ef);
    border-radius: 10px;
    background: #ffffff;
    color: var(--dr-primary-dark, #3a5a8a);
    height: 38px;
    min-width: 38px;
    padding: 0 0.75rem;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 2px 4px rgba(42, 60, 92, 0.04);
}

.paper-pagination .dr-page-btn:hover,
.paper-pagination .dr-page-nav:hover {
    border-color: var(--dr-primary, #4a6da7);
    background: #f8fbff;
    color: var(--dr-primary, #4a6da7);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(42, 60, 92, 0.08);
}

.paper-pagination .dr-page-btn.is-active {
    border-color: var(--dr-primary, #4a6da7);
    background: var(--dr-primary, #4a6da7);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(74, 109, 167, 0.25);
}

.paper-pagination .dr-page-btn:disabled,
.paper-pagination .dr-page-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: #f1f3f4;
    border-color: #d8e1ef;
    transform: none;
    box-shadow: none;
}

.paper-pagination .dr-page-ellipsis {
    color: var(--dr-muted, #627087);
    font-weight: 700;
    letter-spacing: 0.1em;
    padding: 0 0.5rem;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    height: 38px;
}

.paper-detail-modal {
    position: fixed;
    inset: 0;
    z-index: 10010;
    display: flex;
    align-items: center;
    justify-content: center;
}

.paper-detail-modal[hidden] {
    display: none;
}

.paper-detail-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(16, 28, 46, 0.45);
    backdrop-filter: blur(1.5px);
}

.paper-detail-modal-panel {
    position: relative;
    width: min(860px, 92vw);
    max-height: min(760px, 90vh);
    display: grid;
    grid-template-rows: auto 1fr;
    background: #fff;
    border: 1px solid rgba(140, 168, 198, 0.78);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 28px 56px -30px rgba(25, 45, 72, 0.7);
}

.paper-detail-modal .paper-detail-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.7rem;
    padding: 0.9rem 1rem;
    border-bottom: 1px solid rgba(145, 171, 203, 0.36);
    background: linear-gradient(180deg, #fbfdff, #f4f8ff);
    position: relative;
    width: 100%;
    z-index: 1;
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
}

.paper-detail-modal .paper-detail-modal-header h2 {
    margin: 0;
    font-size: 1rem;
    color: #1f3f66;
}

.paper-detail-close-btn {
    width: 36px;
    height: 36px;
    border-radius: 9px;
    border: 1px solid rgba(140, 168, 198, 0.62);
    background: #fff;
    color: #36577d;
    cursor: pointer;
}

.paper-detail-modal-body {
    overflow: auto;
    padding: 1rem;
    color: #2f4f72;
    line-height: 1.6;
}

.paper-detail-loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #516b89;
}

.paper-detail-title {
    margin: 0;
    font-size: 1.18rem;
    line-height: 1.45;
    color: #1f3f66;
}

.paper-detail-meta {
    margin-top: 0.75rem;
    display: grid;
    gap: 0.35rem;
    font-size: 0.9rem;
    color: #4f6886;
}

.paper-detail-actions {
    margin-top: 0.85rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.paper-btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 42px;
    padding: 0 1.2rem;
    border: 1px solid rgba(37, 99, 235, 0.3);
    border-radius: 10px;
    text-decoration: none;
    color: #2563eb !important;
    background: #f0f7ff;
    font-weight: 700;
    font-size: 0.88rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
    margin-bottom: 0.8rem;
}

.paper-btn-primary:hover {
    background: #2563eb;
    color: white !important;
    border-color: #2563eb;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

.paper-link-tip {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    line-height: 1.6;
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
}

.paper-link-tip i {
    color: #3b82f6;
    margin-top: 0.2rem;
    font-size: 0.9rem;
}

.dark-mode .paper-link-tip {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-tertiary);
}

.paper-detail-section {
    margin-top: 1.25rem;
}

.paper-detail-section h3 {
    margin: 0 0 0.6rem;
    color: #1e3a8a;
    font-size: 1rem;
    font-weight: 700;
}

.paper-detail-abstract {
    margin: 0;
    white-space: pre-wrap;
    color: #334f6f;
    font-size: 0.92rem;
}

body.paper-modal-open {
    overflow: hidden;
}

@media (max-width: 980px) {
    .paper-controls {
        grid-template-columns: 1fr 1fr;
    }

    .paper-refresh-btn {
        grid-column: 1 / -1;
    }

    .paper-detail-modal-panel {
        width: min(920px, 95vw);
        max-height: 92vh;
    }
}

@media (max-width: 640px) {
    .paper-controls {
        grid-template-columns: 1fr;
    }

    .paper-list {
        grid-template-columns: 1fr;
    }
}

/* Source Badges */
.source-badge {
    display: inline-block;
    padding: 2px 7px;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 700;
    margin-right: 8px;
    letter-spacing: -0.01em;
    vertical-align: middle;
}
.source-kci { background: #e3f2fd; color: #1976d2; }
.source-cnki { background: #fff3e0; color: #f57c00; }
.source-oasis { background: #f1f8e9; color: #689f38; }

/* Dark mode overrides (optional if global theme handles it) */
[data-theme="dark"] .source-kci { background: rgba(25, 118, 210, 0.2); color: #90caf9; }
[data-theme="dark"] .source-cnki { background: rgba(245, 124, 0, 0.2); color: #ffcc80; }
[data-theme="dark"] .source-oasis { background: rgba(104, 159, 56, 0.2); color: #c5e1a5; }