:root {
    --primary-color: #4a6bff;
    --secondary-color: #ff6b6b;
    --dark-color: #333;
    --light-color: #f8f9fa;
    --gray-color: #6c757d;
    --border-radius: 5px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f5f5;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #3a5bef;
}

/* Header */
header {
    background-color: white;
    box-shadow: var(--box-shadow);
    padding: 0px 0;
    
    top: 0;
    z-index: 1000;
  position: static;
}

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

  position: static;
}

header h1 {
    color: var(--primary-color);
    font-size: 28px;
}

.main-nav ul {
    display: flex;
}

.main-nav li {
    margin-left: 20px;
}

.main-nav a {
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 0;
    position: relative;
}

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

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

.main-nav a:hover::after {
    width: 100%;
}

/* Tab system */
.tabs-system {
    margin: 40px 0;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.tabs-system input[type="radio"] {
    display: none;
}

.tabs-system label {
    display: inline-block;
    padding: 15px 25px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
    background-color: #f1f1f1;
    border-right: 1px solid #ddd;
    margin-bottom: -1px;
}

.tabs-system label i {
    margin-right: 8px;
}

.tabs-system label:last-child {
    border-right: none;
}

.tabs-system label:hover {
    background-color: #e1e1e1;
}

.tabs-system input[type="radio"]:checked + label {
    background-color: white;
    border-bottom: 3px solid var(--primary-color);
    color: var(--primary-color);
}

.tab-content {
    display: none;
    padding: 30px;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

#tab1:checked ~ #content1,
#tab2:checked ~ #content2,
#tab3:checked ~ #content3,
#tab4:checked ~ #content4,
#tab5:checked ~ #content5 {
    display: block;
}

/* Tab content */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.feature {
    text-align: center;
    padding: 25px;
    border-radius: var(--border-radius);
    background-color: #f9f9f9;
    transition: transform 0.3s;
}

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

.feature i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.services-grid, .products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.service, .product {
    background-color: #f9f9f9;
    border-radius: var(--border-radius);
    padding: 25px;
    text-align: center;
    transition: transform 0.3s;
}

.service:hover, .product:hover {
    transform: translateY(-5px);
}

.service i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.product img {
    border-radius: var(--border-radius);
    margin-bottom: 15px;
}

.price {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
    margin: 15px 0;
}

.old-price {
    text-decoration: line-through;
    color: var(--gray-color);
    font-size: 16px;
    margin-left: 5px;
}

.about-content {
    display: flex;
    gap: 30px;
    margin-top: 30px;
    align-items: center;
}

.about-img {
    border-radius: var(--border-radius);
    max-width: 400px;
}

.about-text ul {
    margin-top: 15px;
}

.about-text li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.about-text i {
    color: var(--primary-color);
    margin-right: 10px;
}

.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 30px;
}

.contact-info {
    background-color: #f9f9f9;
    padding: 25px;
    border-radius: var(--border-radius);
}

.contact-info p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.contact-info i {
    margin-right: 10px;
    color: var(--primary-color);
    width: 20px;
    text-align: center;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    transition: background-color 0.3s;
}

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

.contact-form .form-group {
    margin-bottom: 20px;
}

.contact-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
}

.contact-form textarea {
    height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 50px;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        text-align: center;
      align-items: center;

  position: static;
}
    
    .main-nav ul {
        margin-top: 15px;
        justify-content: center;
    }
    
    .main-nav li {
        margin: 0 10px;
    }
    
    .tabs-system label {
        padding: 10px 15px;
        font-size: 14px;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-img {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .tabs-system label {
        display: block;
        border-right: none;
        border-bottom: 1px solid #ddd;
    }
    
    .features, .services-grid, .products-grid {
        grid-template-columns: 1fr;
    }
}

/* logo */
.logo {
    height: 200px;
    display: block;
}

/* === OVERRIDE: Center logo, header scrolls with page === */
header .container {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: flex-start !important;
  position: static !important;
}

.logo, .logo img {
  display: block !important;
  height: 200px !important;
  width: auto !important;
  margin: 0 auto !important; /* centers horizontally */
}


/* DARK MODE PATCH */
body.dark .tabs-system,
body.dark .tab-content,
body.dark .feature,
body.dark .service,
body.dark .product,
body.dark .contact-info,
body.dark .contact-form,
body.dark .about-content,
body.dark .about-text,
body.dark .contact-container {
    background-color: #1e1e1e !important;
    color: #f5f5f5 !important;
}

body.dark .tabs-system label {
    background-color: #2a2a2a !important;
    border-color: #444 !important;
    color: #f5f5f5 !important;
}

body.dark .tabs-system input[type="radio"]:checked + label {
    background-color: #121212 !important;
    border-bottom: 3px solid #81c2ff !important;
    color: #81c2ff !important;
}

body.dark .btn {
    background-color: #81c2ff !important;
    color: #121212 !important;
}

body.dark .btn:hover {
    background-color: #4a90e2 !important;
}

body.dark input,
body.dark textarea {
    background-color: #2a2a2a !important;
    color: #f5f5f5 !important;
    border: 1px solid #555 !important;
}