:root {
    --primary-color: #FF7B00;
    --primary-hover-color: #E06C00;
    --bg-color: #F8F9FA;
    --surface-color: #FFFFFF;
    --text-color: #212529;
    --text-muted-color: #6C757D;
    --heading-color: #000000;
    --border-color: #DEE2E6;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Lato', sans-serif;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.07);
    --border-radius: 8px;
}

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

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 17px;
}

/* Header & Navigation */
.site-header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--heading-color);
    text-decoration: none;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 2.5rem;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-muted-color);
    font-weight: 700;
    font-size: 1rem;
    transition: color 0.3s ease;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.main-nav a.active {
    color: var(--text-color);
    border-bottom-color: var(--primary-color);
}

/* Main Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

main.container {
    padding-top: 4rem;
    padding-bottom: 4rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 3.5rem;
}

@media (min-width: 992px) {
    main.container {
        grid-template-columns: minmax(0, 2.5fr) minmax(0, 1fr);
    }
}

h1, h2, h3 {
    font-family: var(--font-heading);
    color: var(--heading-color);
    margin-bottom: 1rem;
    line-height: 1.2;
    font-weight: 700;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.3rem; }
p { margin-bottom: 1.5rem; color: var(--text-muted-color); }
a { color: var(--primary-color); text-decoration: none; font-weight: 700; transition: color 0.3s ease; }
a:hover { color: var(--primary-hover-color); }

/* Hero Section */
.hero-section {
    margin-bottom: 3rem;
}
.hero-section .subtitle {
    font-size: 1.25rem;
    color: var(--text-color);
    max-width: 650px;
}

/* Articles Section */
.articles-section h2 {
    margin-bottom: 2.5rem;
}
.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
}

@media (min-width: 768px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.card {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--box-shadow);
}

.card h3 {
    color: var(--heading-color);
}

.card p {
    flex-grow: 1;
    font-size: 1rem;
}

.read-more-link {
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-block;
    margin-top: auto;
}

/* Button */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    text-align: center;
    border: 2px solid var(--primary-color);
    transition: all 0.3s ease;
    font-family: var(--font-body);
}
.btn:hover {
    background-color: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
    color: #fff;
    transform: translateY(-2px);
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}
.widget {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.widget h3 {
    font-size: 1.2rem;
    color: var(--heading-color);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}
.widget-list {
    list-style: none;
}
.widget-list li {
    margin-bottom: 0.75rem;
}
.widget-list li:last-child {
    margin-bottom: 0;
}
.widget-list li a {
    color: var(--text-muted-color);
    font-weight: 400;
    transition: color 0.3s ease;
}
.widget-list li a:hover {
    color: var(--primary-color);
}
.widget.promo {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-hover-color));
    color: #fff;
    border: none;
}
.widget.promo h3 {
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.3);
}
.widget.promo p { color: rgba(255, 255, 255, 0.9); }
.widget.promo .btn {
    background-color: #fff;
    color: var(--primary-color);
}
.widget.promo .btn:hover {
    background-color: #eee;
    color: var(--primary-color);
}

/* Footer */
.site-footer {
    background-color: var(--surface-color);
    color: var(--text-muted-color);
    text-align: center;
    padding: 3rem 1rem;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
}
.footer-links { margin-bottom: 1rem; }
.footer-links a {
    color: var(--text-color);
    margin: 0 1rem;
    font-weight: 400;
    transition: color 0.3s ease;
}
.footer-links a:hover {
    color: var(--primary-color);
}

/* Article & Content Pages */
.content-page,
.full-article {
    background-color: var(--surface-color);
    padding: 3rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}
.article-meta {
    font-size: 0.9rem;
    color: var(--text-muted-color);
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    font-weight: 700;
}
.article-meta span {
    margin-right: 2rem;
}
.full-article h2 {
    margin-top: 3rem;
    font-size: 1.8rem;
    color: var(--heading-color);
}
.full-article ul, .full-article ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}
.full-article li {
    margin-bottom: 0.75rem;
}

.cta-box {
    background-color: var(--bg-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin: 3rem 0;
    text-align: center;
}
.cta-box h3 {
    margin-top: 0;
    font-size: 1.75rem;
}

/* Contact Form */
.contact-form {
    margin-top: 2rem;
}
.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 700;
    color: var(--text-color);
}
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    font-family: var(--font-body);
    font-size: 1rem;
    background-color: #fff;
    color: var(--text-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 123, 0, 0.2);
}
.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

/* Responsive adjustments */
@media (max-width: 767px) {
    .header-content {
        flex-direction: column;
        gap: 1.5rem;
    }
    .main-nav ul {
        justify-content: center;
        flex-wrap: wrap;
        gap: 1rem 1.5rem;
    }
    h1 { font-size: 2.75rem; }
    h2 { font-size: 2rem; }
    .content-page, .full-article { padding: 1.5rem; }
}