/* Papers Page Specific Styles */
.page-hero {
    background: linear-gradient(135deg, #1e40af 0%, #0f172a 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

.page-hero h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.page-hero p {
    font-size: 18px;
    opacity: 0.95;
}

/* Papers Section */
.papers-section {
    padding: 40px 20px 80px;
}

/* Filters Bar */
.filters-bar {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}

.filter-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.filter-item {
    display: flex;
    flex-direction: column;
}

.filter-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-select,
.filter-input {
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
    background: white;
}

.filter-select:focus,
.filter-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Subject Tabs */
.subject-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.tab-btn {
    padding: 12px 20px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.tab-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 22px;
    padding: 0 8px;
    background: var(--light);
    border-radius: 11px;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-light);
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--light);
    border-color: var(--primary);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.tab-btn.active .tab-count {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.tab-btn.biology.active { background: var(--biology); border-color: var(--biology); }
.tab-btn.chemistry.active { background: var(--chemistry); border-color: var(--chemistry); }
.tab-btn.physics.active { background: var(--physics); border-color: var(--physics); }
.tab-btn.maths.active { background: var(--maths); border-color: var(--maths); }
.tab-btn.english.active { background: var(--english); border-color: var(--english); }
.tab-btn.history.active { background: var(--history); border-color: var(--history); }

/* Papers Grid */
.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    min-height: 400px;
}

.loading-state,
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.loading-state i,
.no-results i {
    font-size: 48px;
    margin-bottom: 16px;
    color: var(--primary);
}

.no-results i {
    color: var(--text-light);
}

/* Paper Card */
.paper-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 2px solid var(--border);
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
}

.paper-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--subject-color);
}

.paper-header {
    padding: 20px;
    background: linear-gradient(135deg, var(--subject-color), var(--subject-color));
    color: white;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
}

.paper-subject {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

.paper-icon {
    font-size: 24px;
    opacity: 0.8;
}

.paper-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.paper-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.paper-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.paper-badge {
    padding: 4px 10px;
    background: var(--light);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
}

.paper-badge.board {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
}

.paper-badge.level-foundation {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.paper-badge.level-higher {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.paper-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 8px;
}

.btn-view {
    flex: 1;
    padding: 10px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-decoration: none;
}

.btn-view:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    text-decoration: none;
    color: white;
}

.btn-download {
    padding: 10px 16px;
    background: var(--light);
    color: var(--text);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-download:hover {
    background: white;
    border-color: var(--primary);
    color: var(--primary);
}

/* Subject Colors */
.paper-card.biology { --subject-color: var(--biology); }
.paper-card.chemistry { --subject-color: var(--chemistry); }
.paper-card.physics { --subject-color: var(--physics); }
.paper-card.maths { --subject-color: var(--maths); }
.paper-card.english { --subject-color: var(--english); }
.paper-card.history { --subject-color: var(--history); }

/* Responsive */
@media (max-width: 968px) {
    .filter-row {
        grid-template-columns: 1fr 1fr;
    }
    
    .papers-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 640px) {
    .page-hero h1 {
        font-size: 28px;
    }
    
    .filter-row {
        grid-template-columns: 1fr;
    }
    
    .subject-tabs {
        gap: 6px;
    }
    
    .tab-btn {
        padding: 10px 16px;
        font-size: 13px;
    }
    
    .papers-grid {
        grid-template-columns: 1fr;
    }
}