/* Problems List Page Styles */

/* Breadcrumb - Consistent with other pages */
.breadcrumb {
    padding: 1rem 0;
    background: var(--surface);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.breadcrumb .container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.breadcrumb a:hover {
    background: var(--bg-secondary);
    color: var(--primary-hover);
}

.breadcrumb .separator {
    margin: 0 0.25rem;
    color: var(--text-tertiary);
    font-weight: 600;
}

.breadcrumb span:last-child {
    color: var(--text-primary);
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    background: var(--bg-secondary);
    border-radius: 4px;
}

.problems-list-header {
    padding: 2.5rem 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-color);
}

.problems-list-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.problems-list-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.problems-list-filters {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.filter-pill {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-pill:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary);
    color: var(--text-primary);
}

.filter-pill.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.problems-list-search {
    max-width: 500px;
    margin: 0 auto;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition);
}

.problems-list-search:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-icon-small {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

#problems-filter-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.9375rem;
    outline: none;
}

#problems-filter-input::placeholder {
    color: var(--text-tertiary);
}

.problems-list-section {
    padding: 3rem 0;
    background: var(--bg-primary);
}

.category-group {
    margin-bottom: 3rem;
}

.category-group-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.category-group-icon {
    font-size: 2rem;
}

.category-group-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    flex: 1;
}

.category-group-count {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 50px;
}

.problem-list-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.25rem;
    margin-bottom: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition);
    cursor: pointer;
}

.problem-list-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.problem-number {
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-tertiary);
    min-width: 40px;
    text-align: center;
}

.problem-info {
    flex: 1;
    min-width: 0;
}

.problem-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.problem-name {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.problem-difficulty-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid;
}

.problem-companies {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.company-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.company-icon:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.company-icon svg {
    width: 14px;
    height: 14px;
}

.problem-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.problem-meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.problem-meta-item svg {
    width: 14px;
    height: 14px;
}

.problem-progress-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 100px;
}

.progress-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: conic-gradient(var(--primary) 0deg, var(--bg-tertiary) 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    position: relative;
}

.progress-circle::before {
    content: '';
    position: absolute;
    width: 32px;
    height: 32px;
    background: var(--surface);
    border-radius: 50%;
    z-index: 1;
}

.progress-circle span {
    position: relative;
    z-index: 2;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Empty State */
.problems-empty {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-tertiary);
}

.problems-empty svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.problems-empty h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .problem-list-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .problem-progress-indicator {
        width: 100%;
        justify-content: space-between;
    }
}

@media (max-width: 768px) {
    .problems-list-header {
        padding: 2rem 0;
    }
    
    .problems-list-filters {
        gap: 0.375rem;
    }
    
    .filter-pill {
        padding: 0.375rem 0.75rem;
        font-size: 0.8125rem;
    }
    
    .problems-list-section {
        padding: 2rem 0;
    }
    
    .category-group {
        margin-bottom: 2rem;
    }
    
    .category-group-header {
        flex-wrap: wrap;
    }
    
    .category-group-title {
        font-size: 1.25rem;
    }
    
    .problem-list-item {
        padding: 1rem;
        gap: 0.75rem;
    }
    
    .problem-number {
        font-size: 1rem;
        min-width: 30px;
    }
    
    .problem-name {
        font-size: 1rem;
    }
    
    .problem-companies {
        gap: 0.375rem;
    }
    
    .company-icon {
        font-size: 0.6875rem;
        padding: 0.25rem 0.5rem;
    }
    
    .problem-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Print Styles */
@media print {
    .problems-list-filters,
    .problems-list-search,
    .problem-progress-indicator,
    .fab-container,
    .theme-toggle {
        display: none;
    }
    
    .problem-list-item {
        break-inside: avoid;
    }
}