:root {
    --primary-color: #4f46e5;
    --secondary-color: #ec4899;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f3f4f6;
    --white: #ffffff;
    --gradient-hero: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-badge-blue: linear-gradient(to right, #60a5fa, #3b82f6);
    --gradient-badge-purple: linear-gradient(to right, #a78bfa, #8b5cf6);
    --gradient-badge-indigo: linear-gradient(to right, #818cf8, #6366f1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--white);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: #2563eb; /* Blue logo color */
}

.logo i {
    font-size: 1.5rem;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
}

.nav-link.active {
    background-color: #eff6ff;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    color: #2563eb;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-light);
}

.profile-pic img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    color: var(--white);
    padding: 4rem 0 8rem; /* Extra padding bottom for the overlap */
    text-align: center;
    position: relative;
    /* Create the curved bottom shape */
    border-bottom-left-radius: 50% 20px;
    border-bottom-right-radius: 50% 20px;
    /* Or use clip-path for more complex shape, but border-radius is simpler for this subtle curve */
    clip-path: ellipse(150% 100% at 50% 0%);
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 9999px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s;
}

.btn-primary {
    background-color: var(--white);
    color: #4f46e5;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn:hover {
    transform: translateY(-2px);
}

/* Cards Section */
.cards-section {
    margin-top: -4rem; /* Overlap with hero */
    padding-bottom: 4rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--white);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

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

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--white);
}

.badge-blue { background: var(--gradient-badge-blue); }
.badge-purple { background: var(--gradient-badge-purple); }
.badge-indigo { background: var(--gradient-badge-indigo); }

.date {
    font-size: 0.875rem;
    color: var(--text-light);
}

.card-body h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.card-body p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.btn-text {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.btn-text:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none; /* Hide nav on mobile for simplicity, or add hamburger menu */
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

/* Footer */
.footer {
    background-color: var(--white);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid #e5e7eb;
    text-align: center;
    color: var(--text-light);
}

.footer p {
    margin-bottom: 0.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-light);
    font-size: 1.25rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--primary-color);
}

/* Article Detail Page */
.article-detail {
    padding: 4rem 0;
}

.article-header {
    text-align: center;
    margin-bottom: 3rem;
}

.article-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.article-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.8rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.back-link {
    display: inline-block;
    margin-top: 2rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}