:root {
    --color-primary: #059669;
    --color-primary-hover: rgba(16,185,129,0.15);
    --color-white: #ffffff;
    --color-bg-light: #f8fafc;
    --color-bg-hover: #f1f5f9;
    --color-text-dark: #1e293b;
    --color-text-medium: #475569;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-green: 0 4px 14px rgba(5,150,105,0.18);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1),0 10px 10px -5px rgba(0,0,0,0.04);
    --border-radius: 12px;
    --border-radius-sm: 8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'DM Sans', sans-serif; background: #f8fafc; color: var(--color-text-dark); }

.cat-breadcrumb {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 0.875rem 2rem;
}

.cat-breadcrumb-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.cat-breadcrumb a {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.cat-breadcrumb a:hover { color: var(--color-primary); }
.cat-breadcrumb-sep { color: var(--color-text-light); font-size: 0.75rem; }
.cat-breadcrumb-current { font-size: 0.8125rem; color: var(--color-text-dark); font-weight: 600; }

.cat-hero {
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 100%);
    border-bottom: 1px solid var(--color-border);
    padding: 3.5rem 2rem 3rem;
    position: relative;
    overflow: hidden;
}

.cat-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 10% 50%, rgba(5,150,105,0.09) 0%, transparent 55%),
        radial-gradient(circle at 85% 20%, rgba(16,185,129,0.06) 0%, transparent 50%);
    pointer-events: none;
}

.cat-hero-inner {
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 2.5rem;
    flex-wrap: wrap;
}

.cat-hero-icon-wrap {
    width: 5rem;
    height: 5rem;
    background: var(--color-white);
    border: 2px solid rgba(5,150,105,0.2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.25rem;
    box-shadow: var(--shadow-green);
    flex-shrink: 0;
    animation: iconPop 0.6s cubic-bezier(0.34,1.56,0.64,1) both;
}

.cat-hero-icon-wrap i,
.cat-sidebar-link-icon i { color: var(--color-primary); }

@keyframes iconPop {
    from { opacity:0; transform: scale(0.5) rotate(-10deg); }
    to   { opacity:1; transform: scale(1) rotate(0deg); }
}

.cat-hero-text { flex: 1; min-width: 240px; }

.cat-hero-label {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: 0.625rem;
    animation: fadeUp 0.5s ease-out 0.1s both;
}

.cat-hero h1 {
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: 0.75rem;
    line-height: 1.2;
    animation: fadeUp 0.5s ease-out 0.2s both;
}

.cat-hero-desc {
    font-size: 1.0625rem;
    color: var(--color-text-medium);
    line-height: 1.65;
    max-width: 560px;
    animation: fadeUp 0.5s ease-out 0.3s both;
}

.cat-hero-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-top: 1.25rem;
    animation: fadeUp 0.5s ease-out 0.4s both;
    flex-wrap: wrap;
}

.cat-hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 2rem;
    padding: 0.3rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-medium);
}

.cat-hero-pill .dot {
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

@keyframes fadeUp {
    from { opacity:0; transform:translateY(18px); }
    to   { opacity:1; transform:translateY(0); }
}

.cat-layout {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2.5rem 2rem 5rem;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 2.5rem;
    align-items: start;
}

.cat-filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.cat-filter-pills {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.cat-filter-pill {
    padding: 0.4rem 1rem;
    border-radius: 2rem;
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid var(--color-border);
    background: var(--color-white);
    color: var(--color-text-medium);
    transition: all 0.2s;
    user-select: none;
}

.cat-filter-pill i,
.cat-tag-popular i { margin-right: 0.35rem; }

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

.cat-sort-select {
    padding: 0.4rem 0.875rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-medium);
    background: var(--color-white);
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.cat-sort-select:focus { border-color: var(--color-primary); }
.cat-articles { display: flex; flex-direction: column; gap: 0.875rem; }

.cat-article-card {
    background: var(--color-white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.5rem 1.75rem;
    text-decoration: none;
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    transition: all 0.28s cubic-bezier(0.4,0,0.2,1);
    position: relative;
    overflow: hidden;
    animation: cardIn 0.5s ease-out both;
}

.cat-article-card:nth-child(1) { animation-delay: 0.05s; }
.cat-article-card:nth-child(2) { animation-delay: 0.1s; }
.cat-article-card:nth-child(3) { animation-delay: 0.15s; }
.cat-article-card:nth-child(4) { animation-delay: 0.2s; }
.cat-article-card:nth-child(5) { animation-delay: 0.25s; }
.cat-article-card:nth-child(n+6) { animation-delay: 0.3s; }

@keyframes cardIn {
    from { opacity:0; transform: translateY(12px); }
    to   { opacity:1; transform: translateY(0); }
}

.cat-article-card::before {
    content:'';
    position:absolute;
    left:0;
    top:0;
    bottom:0;
    width:3px;
    background: linear-gradient(180deg, var(--color-primary), #10b981);
    transform: scaleY(0);
    transition: transform 0.28s ease;
    transform-origin: bottom;
}

.cat-article-card:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

.cat-article-card:hover::before { transform: scaleY(1); }

.cat-article-idx {
    font-family: 'Space Mono', monospace;
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--color-primary);
    background: #f0fdf4;
    border-radius: 50%;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.cat-article-body { flex: 1; min-width: 0; }

.cat-article-tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.cat-tag {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: #f0fdf4;
    border: 1px solid rgba(5,150,105,0.2);
    padding: 0.15rem 0.5rem;
    border-radius: 2rem;
}

.cat-tag-popular {
    color: #b45309;
    background: #fffbeb;
    border-color: rgba(180,83,9,0.2);
}

.cat-article-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: 0.4rem;
    line-height: 1.35;
    transition: color 0.2s;
}

.cat-article-card:hover .cat-article-title { color: var(--color-primary); }

.cat-article-excerpt {
    font-size: 0.875rem;
    color: var(--color-text-medium);
    line-height: 1.6;
    margin-bottom: 0.875rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cat-article-footer {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.cat-article-footer-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.cat-article-footer-item svg {
    width: 0.875rem;
    height: 0.875rem;
}

.cat-article-arrow {
    width: 1.125rem;
    height: 1.125rem;
    color: var(--color-text-light);
    flex-shrink: 0;
    align-self: center;
    transition: all 0.25s;
}

.cat-article-card:hover .cat-article-arrow {
    color: var(--color-primary);
    transform: translateX(4px);
}

.cat-sidebar {
    position: sticky;
    top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.cat-sidebar-card {
    background: var(--color-white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.cat-sidebar-card:hover { border-color: rgba(5,150,105,0.3); box-shadow: var(--shadow-green); }

.cat-sidebar-title {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--color-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.cat-sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text-dark);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.cat-sidebar-link:last-child { border-bottom: none; padding-bottom: 0; }
.cat-sidebar-link:first-of-type { padding-top: 0; }
.cat-sidebar-link:hover { color: var(--color-primary); padding-left: 4px; }

.cat-sidebar-link-icon {
    width: 1.75rem;
    height: 1.75rem;
    background: #f0fdf4;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.875rem;
}

.cat-other-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.cat-sidebar-search { position: relative; }

.cat-sidebar-search input {
    width: 100%;
    padding: 0.625rem 0.875rem 0.625rem 2.375rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.875rem;
    background: var(--color-bg-light);
    color: var(--color-text-dark);
    outline: none;
    transition: border-color 0.2s;
}

.cat-sidebar-search input:focus { border-color: var(--color-primary); background: var(--color-white); }

.cat-sidebar-search svg {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1rem;
    height: 1rem;
    color: var(--color-text-light);
    pointer-events: none;
}

.cat-sidebar-contact {
    background: linear-gradient(135deg, #f0fdf4, #ecfdf5);
    border-color: rgba(5,150,105,0.2);
    text-align: center;
}

.cat-sidebar-contact-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--color-primary), #10b981);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.cat-sidebar-contact-icon svg { width: 1.25rem; height: 1.25rem; color: white; }

.cat-sidebar-contact h3 {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: 0.4rem;
}

.cat-sidebar-contact p {
    font-size: 0.8125rem;
    color: var(--color-text-medium);
    line-height: 1.55;
    margin-bottom: 1rem;
}

.cat-contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.25rem;
    background: linear-gradient(135deg, var(--color-primary), #10b981);
    color: white;
    border-radius: var(--border-radius-sm);
    font-size: 0.8125rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.25s;
    box-shadow: var(--shadow-sm);
}

.cat-contact-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-green); }

@media (max-width: 860px) {
    .cat-layout { grid-template-columns: 1fr; }
    .cat-sidebar { position: static; }
}

@media (max-width: 560px) {
    .cat-hero { padding: 2.5rem 1.25rem 2rem; }
    .cat-layout { padding: 2rem 1.25rem 4rem; }
    .cat-hero-icon-wrap { width: 4rem; height: 4rem; font-size: 1.75rem; }
    .cat-filter-bar { flex-direction: column; align-items: flex-start; }
}