:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent-color: #60a5fa;
    /* Category colors are now defined dynamically in index.php from configidx.php */
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Styles */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
    position: relative;
    z-index: 2;
    min-height: 250px;
    justify-content: center;
}

.logo {
    position: absolute;
    top: 60%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(100%, 800px);
    height: auto;
    z-index: 1;
    background-color: transparent;
    padding: 0;
    object-fit: contain;
    filter: blur(8px) brightness(1.6) drop-shadow(0 0 4px rgba(255, 255, 255, .6)) drop-shadow(0 0 8px rgba(255, 255, 255, .6)) drop-shadow(0 0 40px rgba(255, 255, 255, .7)) drop-shadow(0 0 60px rgba(255, 255, 255, .7));
    pointer-events: none;
}

header h1 {
    position: relative;
    z-index: 3;
    font-size: clamp(5rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: 0.01em;
    margin: 0;
    text-shadow: 0 0 25px rgba(0, 0, 0, 0.8), 0 4px 4px rgba(0, 0, 0, 0.6);
}

.subtitle {
    position: relative;
    z-index: 3;
    font-size: 1.5rem;
    max-width: 600px;
    opacity: 0.9;
    font-weight: 400;
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.8), 0 4px 4px rgba(0, 0, 0, 0.8);
}

.header-nav {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
    position: relative;
    z-index: 4;
}


.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.8rem;
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    letter-spacing: 0.12em;
    transition: var(--transition);
    border: 1px solid rgba(40, 68, 162, 0.8);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 2;
    text-shadow:
        -1px -1px 0 rgba(0, 0, 0, 0.25),
        1px -1px 0 rgba(0, 0, 0, 0.25),
        -1px 1px 0 rgba(0, 0, 0, 0.25),
        1px 1px 0 rgba(0, 0, 0, 0.25),
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-back:hover {
    background-color: rgba(255, 255, 255, 0.4);
    border: 2px solid rgb(134, 233, 255);
    transform: translateX(-4px);
    box-shadow: var(--shadow-md);
}

/* Main Content */
main {
    padding: 5rem 0;
}

section {
    margin-bottom: 6rem;
}

h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

h2::after {
    content: '';
    flex: 1;
    height: 2px;
    background-color: var(--border-color);
}

/* Latest Posts Grid */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.post-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.post-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.post-card.featured {
    border-top: 5px solid var(--cat-color, var(--primary-color));
}

.post-card.featured:hover {
    border-top-color: var(--primary-color);
}

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.category-badge {
    background-color: var(--cat-bg, #eff6ff);
    color: var(--cat-color, var(--primary-color));
    padding: 0.4rem 1rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--cat-border, #bfdbfe);
}

.post-date {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.post-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.post-description {
    color: var(--text-muted);
    margin-bottom: 2rem;
    flex-grow: 1;
    font-size: 0.95rem;
}

/* Buttons */
.btn-view {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--cat-color, var(--primary-color));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-view:hover {
    background-color: var(--primary-dark);
    gap: 0.5rem;
}

/* Buttons turn blue on card hover */
.post-card:hover .btn-view {
    background-color: var(--primary-color);
}

.post-card:hover .btn-view:hover {
    background-color: var(--primary-dark);
}

/* Category Filter */
.category-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.filter-btn {
    background-color: white;
    color: var(--primary-color);
    border: 1.5px solid var(--border-color);
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.filter-btn[data-category] {
    color: var(--cat-color);
    border-color: var(--cat-border);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    background-color: #f0f7ff;
    transform: translateY(-2px);
}

.filter-btn[data-category]:hover {
    background-color: var(--cat-bg);
    border-color: var(--cat-color);
    box-shadow: 0 4px 10px var(--cat-bg);
}

.filter-btn.active {
    background-color: var(--primary-color) !important;
    color: white !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.filter-btn[data-category].active {
    background-color: var(--cat-color) !important;
    color: white !important;
    border-color: var(--cat-color) !important;
    box-shadow: 0 4px 12px var(--cat-border);
}

/* All Posts List */
.posts-list {
    display: grid;
    gap: 1.5rem;
}

.post-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--cat-color, var(--primary-color));
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

/* Buttons turn blue on post-item hover */
.post-item:hover .btn-view {
    background-color: var(--primary-color);
}

.post-item:hover .btn-view:hover {
    background-color: var(--primary-dark);
}

.post-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.post-item-header>div {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.post-item h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 4rem;
    flex-wrap: wrap;
}

.pagination-btn {
    padding: 0.75rem 1.25rem;
    background-color: white;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    min-width: 44px;
    text-align: center;
}

.pagination-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: #eff6ff;
}

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

/* Footer */
footer {
    background-color: #0f172a;
    color: white;
    padding: 4rem 0;
    text-align: center;
}

footer p {
    font-size: 1rem;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 3rem 0;
    }

    .post-item-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .post-item h3 {
        font-size: 1.25rem;
    }

    section {
        margin-bottom: 4rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .category-filter {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }
}