:root {
    --primary-color: #0056b3;
    --secondary-color: #00a8e8;
    --accent-color: #ff6b00;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --darker-color: #212529;
    --gray-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    
    --bg-color: #ffffff;
    --text-color: #333333;
    --header-footer-bg: #ffffff;
    --header-footer-text: var(--darker-color);
    --card-bg: #ffffff;
    --section-bg: var(--light-color);
    --border-color: #ddd;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --header-footer-bg: #1e1e1e;
    --header-footer-text: #ffffff;
    --card-bg: #1e1e1e;
    --section-bg: #2a2a2a;
    --border-color: #444;
    
    --primary-color: #4dabf7;
    --secondary-color: #74c0fc;
    --accent-color: #ff922b;
    --light-color: #2a2a2a;
    --dark-color: #e0e0e0;
    --darker-color: #ffffff;
    --gray-color: #adb5bd;
    --success-color: #51cf66;
    --danger-color: #ff6b6b;
}

* { 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(--bg-color);
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header {
    background-color: var(--header-footer-bg);
    color: var(--header-footer-text);
    padding: 15px 0;
    position: fixed;
    width: 100%; top: 0; z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, color 0.3s;
}

.header-container { display: flex; justify-content: space-between; align-items: center; }
.header-controls { display: flex; align-items: center; gap: 15px; }
.logo { display: flex; align-items: center; }

/* Theme Toggle */
.theme-toggle { position: relative; display: inline-block; width: 50px; height: 26px; }
.theme-toggle-input { opacity: 0; width: 0; height: 0; }
.theme-toggle-label {
    position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ccc; transition: .4s; border-radius: 34px;
}
.theme-toggle-label:before {
    position: absolute; content: ""; height: 18px; width: 18px; left: 4px; bottom: 4px;
    background-color: white; transition: .4s; border-radius: 50%;
}
.theme-toggle-input:checked + .theme-toggle-label { background-color: var(--primary-color); }
.theme-toggle-input:checked + .theme-toggle-label:before { transform: translateX(24px); }

.language-switcher {
    background-color: var(--primary-color); border: none; color: white;
    padding: 8px 15px; border-radius: 4px; cursor: pointer; font-weight: 600;
    transition: background-color 0.3s;
}
.language-switcher:hover { background-color: var(--secondary-color); }

/* Hero */
.hero {
    background: linear-gradient(rgba(0, 86, 179, 0.9), rgba(0, 168, 232, 0.8)), url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?ixlib=rb-4.0.3') center/cover no-repeat;
    height: 100vh;
    display: flex; align-items: center; text-align: center;
    color: white; padding-top: 80px;
}
.hero-content { max-width: 800px; margin: 0 auto; }
.hero h2 { font-size: 3rem; margin-bottom: 20px; text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3); }
.hero p { font-size: 1.2rem; margin-bottom: 30px; max-width: 600px; margin-left: auto; margin-right: auto; }

.btn {
    display: inline-block; background-color: var(--accent-color); color: white;
    padding: 12px 30px; border-radius: 4px; text-decoration: none; font-weight: 600;
    transition: all 0.3s; border: none; cursor: pointer; font-size: 1rem;
}
.btn:hover { background-color: #e55a00; transform: translateY(-3px); }

/* Services */
.services { padding: 80px 0; background-color: var(--section-bg); transition: background-color 0.3s; }
.section-title { text-align: center; margin-bottom: 60px; }
.section-title h2 { font-size: 2.5rem; color: var(--primary-color); margin-bottom: 15px; }
.section-title p { color: var(--gray-color); max-width: 700px; margin: 0 auto; font-size: 1.1rem; }
.services-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; }

.service-card {
    background-color: var(--card-bg); border-radius: 8px; padding: 30px; text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}
.service-card:hover { transform: translateY(-10px); box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1); }
.service-card i { font-size: 3rem; color: var(--secondary-color); margin-bottom: 20px; }
.service-card h3 { font-size: 1.3rem; margin-bottom: 15px; color: var(--dark-color); }
.service-card p { color: var(--gray-color); margin-bottom: 20px; }

/* About */
.about { padding: 80px 0; background-color: var(--card-bg); transition: background-color 0.3s; }
.about-content { display: flex; align-items: center; gap: 50px; }
.about-text { flex: 1; }
.about-text h2 { font-size: 2.5rem; color: var(--primary-color); margin-bottom: 20px; }
.about-text p { margin-bottom: 20px; color: var(--gray-color); }
.about-image { flex: 1; border-radius: 8px; overflow: hidden; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); max-height: 400px; }
.about-image img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* Contact */
.contact { padding: 80px 0; background-color: var(--section-bg); transition: background-color 0.3s; }
.contact-container { display: flex; gap: 50px; }
.contact-form {
    flex: 1; background-color: var(--card-bg); padding: 40px;
    border-radius: 8px; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: background-color 0.3s;
}
.contact-form h3 { font-size: 1.8rem; color: var(--primary-color); margin-bottom: 20px; }
.elem-group { margin-bottom: 20px; }
.elem-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--dark-color); }
.elem-group input, .elem-group textarea {
    width: 100%; padding: 12px; border: 1px solid var(--border-color);
    border-radius: 4px; font-size: 1rem; font-family: inherit;
    background-color: var(--card-bg); color: var(--text-color);
    transition: border-color 0.3s, background-color 0.3s;
}
.elem-group input:focus, .elem-group textarea:focus {
    border-color: var(--secondary-color); outline: none;
    box-shadow: 0 0 0 2px rgba(0, 168, 232, 0.2);
}
.elem-group textarea { height: 150px; resize: vertical; }
.contact-info { flex: 1; }
.contact-info h3 { font-size: 1.8rem; color: var(--primary-color); margin-bottom: 20px; }
.contact-item { display: flex; align-items: flex-start; margin-bottom: 20px; }
.contact-item i { font-size: 1.5rem; color: var(--secondary-color); margin-right: 15px; width: 30px; text-align: center; margin-top: 5px; }
.contact-item p { margin: 0; color: var(--gray-color); }
.contact-item p strong { display: block; color: var(--dark-color); }

/* Footer */
footer {
    background-color: var(--header-footer-bg); color: var(--header-footer-text);
    padding: 40px 0; text-align: center;
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}
.footer-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.footer-logo { display: flex; align-items: center; }
.footer-logo i { font-size: 1.8rem; color: var(--primary-color); margin-right: 10px; }
.footer-logo h2 { font-size: 1.5rem; color: var(--header-footer-text); }
.social-links { display: flex; gap: 15px; }
.social-links a { color: var(--header-footer-text); font-size: 1.2rem; transition: color 0.3s; }
.social-links a:hover { color: var(--secondary-color); }

/* Notification */
.notification {
    position: fixed; top: 100px; right: 20px; padding: 15px 25px;
    background-color: var(--success-color); color: white; border-radius: 4px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transform: translateX(150%); transition: transform 0.3s ease-in-out; z-index: 1001;
}
.notification.show { transform: translateX(0); }
.notification.error { background-color: var(--danger-color); }

/* Responsive */
@media (max-width: 992px) {
    .about-content, .contact-container { flex-direction: column; }
    .hero h2 { font-size: 2.5rem; }
    .about-image { max-height: 350px; }
}
@media (max-width: 768px) {
    .hero h2 { font-size: 2rem; }
    .section-title h2 { font-size: 2rem; }
    .services-grid { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; gap: 20px; }
    .about-image { max-height: 300px; }
}

/* Logo Styles */
.logo-img { height: 50px; width: auto; transition: transform 0.3s ease; }
.logo:hover .logo-img { transform: scale(1.05); }

/* Footer legal */
footer > .container > div:last-child {
    margin-top: 30px; padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--gray-color); transition: border-color 0.3s;
}
.footer-legal-links { margin-top: 15px; }
.footer-legal-links a { color: #0066cc; margin: 0 10px; text-decoration: none; transition: color 0.3s; }
.footer-legal-links a:hover { color: #004499; }