/* Category Page Styles */

/* Breadcrumb — slim bar */
.breadcrumb {
    padding: 0.4rem 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 56px;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    line-height: 1;
}

.breadcrumb .container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
}

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

.breadcrumb .separator {
    margin: 0 0.15rem;
    color: var(--text-tertiary);
    font-weight: 600;
}

.breadcrumb span:last-child {
    color: var(--text-primary);
    font-weight: 600;
    padding: 0.2rem 0.4rem;
    background: var(--bg-secondary);
    border-radius: 4px;
}

/* Category Hero */
.category-hero {
    padding: 2.5rem 0 1.5rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

.category-hero-content {
    text-align: center;
}

.category-hero-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    animation: fadeInUp 0.6s ease-out;
    display: block;
}

.category-hero-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    margin-bottom: 0.35rem;
    color: var(--text-primary);
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.category-hero-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 0.9rem;
    line-height: 1.5;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.category-hero-stats {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease-out 0.6s both;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.9rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.stat-badge-value {
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-badge-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Problems Section */
.problems-section {
    padding: 3rem 0;
    background: var(--bg-primary);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.problem-card {
    padding: 2rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-hover) 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.problem-card:hover::before {
    transform: scaleX(1);
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.problem-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.problem-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.problem-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
    flex-shrink: 0;
}

.problem-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.problem-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.problem-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.problem-progress {
    margin-bottom: 1rem;
}

.problem-progress-bar {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 50px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.problem-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-hover) 100%);
    border-radius: 50px;
    transition: width 0.6s ease-out;
}

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

.problem-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.btn-start {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.btn-start:hover {
    background: var(--primary-hover);
    transform: translateX(4px);
}

.btn-start svg {
    width: 16px;
    height: 16px;
}

/* Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .category-hero { padding: 1rem 0; }
    .category-hero-icon { font-size: 1.75rem; }
    .category-hero-stats { gap: 0.5rem; }
    .stat-badge { padding: 0.3rem 0.75rem; }
    .stat-badge-value { font-size: 0.9rem; }
    .problems-section { padding: 2rem 0; }
    .problems-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    .problem-meta { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}