/* SPETROM Oil and Gas Company - Main Stylesheet */

:root {
    --primary-color: #1a4d7a;
    --secondary-color: #2c6b9e;
    --accent-color: #f39c12;
    --dark-color: #0d2d47;
    --light-color: #f5f5f5;
    --text-color: #333;
    --white: #ffffff;
    --gray: #666;
    --light-gray: #e0e0e0;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

/* Header Styles */
header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
}

.logo img {
    max-height: 60px;
    width: auto;
}

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

nav ul li a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 1rem;
    display: block;
}

nav ul li a:hover {
    color: var(--accent-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Sliding Header Hero Section */
.hero-slider {
    position: relative;
    width: 100%;
    height: 500px;
    overflow: hidden;
}

.hero-slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide.active {
    opacity: 1;
}

.hero-content {
    text-align: center;
    color: var(--white);
    z-index: 2;
    padding: 2rem;
    background: rgba(0,0,0,0.5);
    border-radius: 10px;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.hero-slider-nav {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 3;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: background 0.3s;
}

.slider-dot.active {
    background: var(--white);
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 20px;
}

.section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--accent-color);
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.content-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.15);
}

.content-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.content-card-body {
    padding: 1.5rem;
}

.content-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    background-color: var(--secondary-color);
}

.btn-secondary {
    background-color: var(--accent-color);
}

.btn-secondary:hover {
    background-color: #e67e22;
}

/* Forms */
.form-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--light-gray);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: var(--light-gray);
}

/* Image Gallery */
.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    aspect-ratio: 4/3;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

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

.blog-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.blog-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.blog-card-body {
    padding: 1.5rem;
}

.blog-card-date {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

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

.testimonial-card {
    background: var(--light-color);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.testimonial-author {
    font-weight: bold;
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-color);
        flex-direction: column;
        padding: 1rem;
    }

    nav ul.active {
        display: flex;
    }

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

    .hero-content p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .content-grid,
    .blog-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* SEO and Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}