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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f9f9f9;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: #2c3e50;
    color: #fff;
    padding: 1rem 0;
    border-bottom: 3px solid #f1c40f;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #f1c40f;
}

/* Main content */
main {
    min-height: 70vh;
    padding: 2rem 0;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

h2 {
    font-size: 2rem;
    margin: 1.5rem 0 1rem;
    color: #34495e;
}

/* Hero section */
.hero {
    background: linear-gradient(135deg, #3498db, #2c3e50);
    color: #fff;
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.hero h1 {
    color: #fff;
    font-size: 2.8rem;
}

/* Calculator */
.calculator {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    margin: 2rem 0;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

button {
    background: #f1c40f;
    color: #2c3e50;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #d4ac0d;
}

.result {
    margin-top: 1rem;
    padding: 1rem;
    background: #ecf0f1;
    border-radius: 5px;
    font-weight: 500;
}

/* Article grid */
.latest-articles h2 {
    margin-top: 2rem;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.article-card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

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

.article-card h3 a {
    color: #2c3e50;
    text-decoration: none;
}

.article-card h3 a:hover {
    text-decoration: underline;
}

.meta {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

.read-more {
    display: inline-block;
    margin-top: 1rem;
    color: #3498db;
    font-weight: 600;
    text-decoration: none;
}

.read-more:hover {
    text-decoration: underline;
}

/* Article page */
.article p, .article li {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.article ul, .article ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

/* Contact form */
.contact-form {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    max-width: 600px;
    margin: 2rem 0;
}

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

.note {
    color: #7f8c8d;
    font-style: italic;
}

/* Footer */
footer {
    background: #2c3e50;
    color: #ecf0f1;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

footer a {
    color: #f1c40f;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.6rem;
    }
}