/* =========================================
   PAPERS ISLAND (Vue) - Matching Design System
   ========================================= */

.papers-island-container {
    margin-top: 3rem;
    padding: 2rem;
    background: rgba(28, 25, 23, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    color: var(--text-secondary);
    position: relative;
    overflow: hidden;
}

/* Gradient border effect */
.papers-island-container::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    padding: 1px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(20, 184, 166, 0.2));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.papers-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--primary-400);
}

.papers-icon {
    color: var(--primary-400);
    width: 22px;
    height: 22px;
}

.papers-profile {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: -0.5rem 0 1.25rem;
    color: var(--text-muted);
    font-size: 0.78rem;
    line-height: 1.5;
}

.papers-profile-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.papers-profile-divider {
    color: var(--text-disabled);
}

/* =========================================
   GRID LAYOUT
   ========================================= */
.papers-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 1024px) {
    .papers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* =========================================
   PAPER CARD
   ========================================= */
.paper-card {
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.paper-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-500);
    background: rgba(99, 102, 241, 0.05);
}

.paper-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
    flex-wrap: wrap;
}

.paper-year {
    font-weight: 600;
    color: var(--text-muted);
}

/* Citations Badge */
.paper-citations {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.citation-icon {
    width: 12px;
    height: 12px;
    color: var(--warning);
}

/* Open Access PDF Badge */
.paper-open-access {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Language Badges */
.paper-lang-badge {
    margin-left: auto;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
}

.paper-lang-badge.lang-ru {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-400);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.paper-lang-badge.lang-en {
    background: rgba(107, 114, 128, 0.2);
    color: var(--text-muted);
    border: 1px solid rgba(107, 114, 128, 0.4);
}

.paper-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
    line-height: 1.4;
}

.paper-authors {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0 0 0.75rem 0;
    font-style: italic;
}

.paper-abstract {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-reasons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin: 0.9rem 0 0;
    padding: 0;
    list-style: none;
}

.paper-reasons li {
    padding: 0.22rem 0.5rem;
    border-radius: 6px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-muted);
    border: 1px solid rgba(99, 102, 241, 0.18);
    font-size: 0.72rem;
    line-height: 1.35;
}

/* =========================================
   SKELETON LOADING
   ========================================= */
.papers-loading {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 1024px) {
    .papers-loading {
        grid-template-columns: repeat(2, 1fr);
    }
}

.skeleton-card {
    padding: 1.25rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .5; }
}

.skeleton-title {
    height: 1.25rem;
    background: var(--bg-muted);
    border-radius: 4px;
    width: 80%;
    margin-bottom: 1rem;
}

.skeleton-authors {
    height: 0.875rem;
    background: var(--bg-muted);
    border-radius: 4px;
    width: 50%;
    margin-bottom: 1.25rem;
}

.skeleton-text {
    height: 0.875rem;
    background: var(--bg-muted);
    border-radius: 4px;
    width: 100%;
    margin-bottom: 0.5rem;
}

.skeleton-text.short {
    width: 70%;
}

/* =========================================
   LOAD MORE BUTTON
   ========================================= */
.papers-load-more {
    text-align: center;
    margin-top: 1.5rem;
}

.btn-load-more {
    background: transparent;
    color: var(--primary-400);
    border: 1px solid rgba(99, 102, 241, 0.4);
    padding: 0.6rem 2rem;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-main);
}

.btn-load-more:hover {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

/* =========================================
   FOOTER & STATES
   ========================================= */
.papers-footer {
    margin-top: 1.5rem;
    text-align: right;
    font-size: 0.75rem;
    color: var(--text-disabled);
}

.papers-footer a {
    color: var(--text-muted);
    text-decoration: underline;
}

.papers-footer a:hover {
    color: var(--text-secondary);
}

.papers-error,
.papers-empty {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}