/* ==========================================
   CSS Variables & Reset
   ========================================== */
:root {
    /* Colors - Professional Blue Corporate Theme */
    --primary-blue: #0066cc;
    --primary-dark: #003d7a;
    --secondary-blue: #0080ff;
    --accent-orange: #ff6600;
    --accent-yellow: #ffa500;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #2c3e50;
    --text-dark: #1a1a1a;
    --white: #ffffff;
    --overlay: rgba(0, 0, 0, 0.6);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Typography */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-normal: 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-slow: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-dark);
}

h1 {
    font-size: clamp(2rem, 5vw, var(--font-size-3xl));
}

h2 {
    font-size: clamp(1.75rem, 4vw, var(--font-size-2xl));
}

h3 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

/* ==========================================
   Layout Components
   ========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--primary-dark);
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    font-size: var(--font-size-lg);
    color: var(--dark-gray);
    line-height: 1.8;
}

/* ==========================================
   Header Navigation
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin: 0;
    font-weight: 800;
}

.logo .tagline {
    display: block;
    font-size: 0.75rem;
    color: var(--dark-gray);
    font-weight: 400;
    margin-top: -0.25rem;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-blue);
    background: var(--light-gray);
}

/* Dropdown Navigation */
.nav-dropdown {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding-bottom: 0.75rem;
    margin-bottom: -0.75rem;
}

.nav-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height: 0.75rem;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.25rem);
    left: 50%;
    transform: translateX(-50%) translateY(0.35rem);
    background: var(--white);
    min-width: 260px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    padding: 0.5rem 0;
    z-index: 1000;
    border: 1px solid rgba(0, 0, 0, 0.08);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--white);
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.dropdown-item:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.dropdown-item.active {
    color: var(--primary-blue);
    background: rgba(0, 102, 204, 0.08);
}


/* ==========================================
   Hero Section
   ========================================== */
.hero {
    min-height: 70vh;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-xl) 0;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 166, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 128, 255, 0.15) 0%, transparent 50%);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(0, 0, 0, 0.2) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    color: var(--white);
}

.hero-text {
    max-width: 900px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--white);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.gas-types {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin: var(--spacing-md) 0;
}

.gas-badge {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-fast);
}

.gas-badge:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.location {
    margin: var(--spacing-md) 0;
    font-size: var(--font-size-lg);
    font-weight: 500;
}

/* ==========================================
   Buttons
   ========================================== */
.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-orange) 0%, var(--accent-yellow) 100%);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.25rem;
}

/* ==========================================
   Products Section
   ========================================== */
.products-section {
    background: var(--white);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.product-card {
    background: var(--white);
    border: 2px solid var(--medium-gray);
    border-radius: 15px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.product-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 35px rgba(0, 102, 204, 0.2);
    border-color: var(--primary-blue);
}

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.product-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.product-card p {
    color: var(--dark-gray);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin: 0;
}

/* ==========================================
   Medical Section
   ========================================== */
.medical-section {
    background: var(--light-gray);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
}

.text-content h2 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
}

.text-content p {
    font-size: var(--font-size-lg);
    color: var(--dark-gray);
    line-height: 1.8;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-md);
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-lg);
    color: var(--dark-gray);
}

.image-placeholder {
    aspect-ratio: 4/3;
    background: var(--medium-gray);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.image-placeholder:hover img {
    transform: scale(1.1);
}

/* ==========================================
   Services Section
   ========================================== */
.services-section {
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background: var(--light-gray);
    border-radius: 15px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.service-card:hover {
    background: var(--white);
    border-color: var(--primary-blue);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 35px rgba(0, 102, 204, 0.15);
}

.service-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-sm);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 102, 204, 0.12);
    color: var(--primary-blue);
}

.service-icon svg,
.advantage-icon svg {
    width: 34px;
    height: 34px;
}

.service-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.service-card p {
    color: var(--dark-gray);
    margin: 0;
}

/* ==========================================
   VGL Section
   ========================================== */
.vgl-section {
    background: linear-gradient(to bottom, var(--light-gray) 0%, var(--white) 100%);
}

.vgl-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.vgl-card {
    background: var(--white);
    border: 2px solid var(--primary-blue);
    border-radius: 15px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.vgl-card:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: 0 20px 45px rgba(0, 102, 204, 0.25);
}

.vgl-card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.vgl-card p {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.vgl-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.vgl-features li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--dark-gray);
}

.vgl-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 700;
}

/* ==========================================
   Advantages Section
   ========================================== */
.advantages-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: var(--white);
}

.advantages-content-center {
    text-align: center;
}

.advantages-content-center h2 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.advantages-grid-flex {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.advantage-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.advantage-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.advantage-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-sm);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.12);
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.advantage-item h3 {
    color: var(--white);
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.advantage-item p {
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

.contact-info-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.contact-info-box h3 {
    color: var(--white);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.contact-item {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    color: var(--white);
}

.contact-item strong {
    color: var(--accent-yellow);
}

.contact-item a {
    color: var(--white);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item a:hover {
    color: var(--accent-yellow);
}

.contact-info-box .btn {
    display: block;
    width: fit-content;
    margin: 0 auto;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--accent-yellow);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    padding: 0.25rem 0;
    color: rgba(255, 255, 255, 0.8);
}

.footer-section a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover,
.footer-section a:focus-visible {
    color: var(--accent-yellow);
}

.footer-tagline {
    color: var(--accent-yellow);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

.footer-legal-line {
    margin: 0.2rem 0;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.85);
}

.footer-legal-line strong {
    color: var(--accent-yellow);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

/* ==========================================
   Mobile Navigation
   ========================================== */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger {
    position: relative;
    width: 25px;
    height: 19px;
    transition: transform 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}

.hamburger span {
    position: absolute;
    left: 0;
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    transition: transform 0.42s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.24s ease, background-color 0.24s ease;
    border-radius: 2px;
    transform-origin: center;
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2) {
    top: 8px;
}

.hamburger span:nth-child(3) {
    top: 16px;
}

.mobile-menu-toggle.active .hamburger span:nth-child(1) {
    transform: translateY(8px) rotate(45deg) scaleX(1.08);
}

.mobile-menu-toggle.active .hamburger span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0.2);
}

.mobile-menu-toggle.active .hamburger span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg) scaleX(1.08);
}

.mobile-menu-toggle.active .hamburger span {
    background: var(--primary-dark);
}

.mobile-menu-toggle.active .hamburger {
    transform: rotate(90deg);
}

/* Mobile Menu Backdrop */
.mobile-menu-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.36s ease;
    pointer-events: none;
}

.mobile-menu-backdrop.active {
    display: block;
    opacity: 1;
    pointer-events: auto;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 968px) {
    .header {
        padding: 0.75rem 0;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .logo .tagline {
        font-size: 0.7rem;
    }
    
    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: block;
        position: relative;
        z-index: 1002;
    }
    
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        padding: 64px 0 var(--spacing-md);
        box-shadow: var(--shadow-xl);
        transition: right 0.42s cubic-bezier(0.22, 1, 0.36, 1);
        z-index: 1001;
        overflow-y: auto;
    }
    
    .nav.active {
        right: 0;
    }

    body.mobile-menu-open {
        overflow: hidden;
    }
    
    .nav-link {
        width: 100%;
        padding: 1rem var(--spacing-md);
        border-radius: 0;
        border-bottom: 1px solid var(--light-gray);
        font-size: 1rem;
    }
    
    .nav-link:hover {
        background: var(--light-gray);
        color: var(--primary-blue);
    }
    
    .nav-dropdown {
        width: 100%;
        display: block;
        padding-bottom: 0;
        margin-bottom: 0;
    }

    .nav-dropdown::after {
        display: none;
    }
    
    .nav-dropdown .nav-link {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .dropdown-menu {
        position: static;
        transform: none;
        display: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        background: var(--light-gray);
        margin: 0;
        padding: 0;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transition: none;
    }

    .nav-dropdown.open .dropdown-menu {
        display: block;
    }
    
    .dropdown-menu::before {
        display: none;
    }
    
    .dropdown-item {
        padding: 0.75rem var(--spacing-lg);
        border-bottom: 1px solid var(--medium-gray);
        font-size: 0.95rem;
    }
    
    .dropdown-item:hover {
        background: var(--white);
    }
    
    /* Content adjustments */
    .hero {
        min-height: 50vh;
        padding: calc(var(--spacing-lg) + 70px) 0 var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 1rem 1.5rem;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .product-grid,
    .services-grid,
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .products-detailed-grid {
        grid-template-columns: 1fr;
    }
    
    .vgl-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
}

@media (max-width: 600px) {
    :root {
        --font-size-base: 15px;
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
    }
    
    .header {
        padding: 0.5rem 0;
    }
    
    .logo h1 {
        font-size: 1.1rem;
    }
    
    .nav {
        top: 0;
        height: 100vh;
        padding-top: 58px;
        width: 260px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-description {
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 1.5rem;
    }
    
    .btn {
        font-size: 1rem;
        padding: 0.875rem 1.25rem;
    }
    
    .product-icon,
    .product-detail-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .service-icon {
        width: 60px;
        height: 60px;
    }

    .service-icon svg,
    .advantage-icon svg {
        width: 30px;
        height: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info-box {
        padding: var(--spacing-md);
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 400px) {
    :root {
        --font-size-base: 14px;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .btn {
        font-size: 0.95rem;
        padding: 0.75rem 1rem;
    }
    
    .product-card,
    .service-card {
        padding: var(--spacing-md);
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .nav-link,
    .btn,
    .dropdown-item {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .service-card,
    .product-card,
    .product-detail-card {
        transition: none;
    }
    
    .service-card:active,
    .product-card:active {
        transform: scale(0.98);
    }
}


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

.mb-1 { margin-top: var(--spacing-sm); }
.mb-2 { margin-top: var(--spacing-md); }
.mb-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

/* ==========================================
   Products Page Specific Styles
   ========================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: var(--white);
    padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-xl);
    text-align: center;
}

.page-header h1 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

.page-header p {
    font-size: var(--font-size-lg);
    opacity: 0.95;
}

.products-page {
    background: var(--light-gray);
}

.products-detailed-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.product-detail-card {
    background: var(--white);
    border: 2px solid var(--medium-gray);
    border-radius: 15px;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.product-detail-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.product-detail-icon {
    width: 80px;
    height: 80px;
    margin: 0 0 var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.product-detail-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
    font-size: 1.5rem;
}

.product-category {
    display: inline-block;
    background: var(--light-gray);
    color: var(--primary-blue);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.product-description {
    color: var(--dark-gray);
    font-size: var(--font-size-base);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.product-specs {
    list-style: none;
    padding: 0;
    margin: 0;
}

.product-specs li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--dark-gray);
    border-top: 1px solid var(--medium-gray);
}

.product-specs li:first-child {
    border-top: none;
}

.product-specs li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 700;
}

.cta-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: var(--white);
}

.cta-box {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-box h2 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.cta-box p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.hero-description {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    margin: var(--spacing-md) 0;
    opacity: 0.95;
}

.hero-description p {
    margin: 0 0 var(--spacing-sm);
}

.hero-description p:last-child {
    margin-bottom: 0;
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-blue);
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.nav-link.active {
    color: var(--primary-blue);
    background: var(--light-gray);
}

/* Mobile responsive for products page */
@media (max-width: 768px) {
    .products-detailed-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        padding: calc(var(--spacing-lg) + 70px) 0 var(--spacing-lg);
    }
}

/* ==========================================
   Service Detail Pages
   ========================================== */
.service-detail-section {
    background: var(--light-gray);
}

.service-detail-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.service-main {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
}

.service-main h2 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
}

.service-main h3 {
    color: var(--primary-dark);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.service-main h4 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.service-main p {
    color: var(--dark-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.service-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

.service-list li {
    padding: var(--spacing-xs) 0 var(--spacing-xs) 2rem;
    position: relative;
    color: var(--dark-gray);
    line-height: 1.8;
}

.service-list li::before {
    content: '▸';
    position: absolute;
    left: 0.5rem;
    color: var(--primary-blue);
    font-weight: 700;
}

.service-list-small {
    list-style: none;
    padding: 0;
    margin: var(--spacing-sm) 0;
}

.service-list-small li {
    padding: 0.25rem 0 0.25rem 1.25rem;
    position: relative;
    color: var(--dark-gray);
    font-size: var(--font-size-sm);
}

.service-list-small li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
}

.feature-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.feature-box {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: 10px;
    border-left: 4px solid var(--primary-blue);
}

.advantages-list-inline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.advantage-inline {
    display: flex;
    gap: var(--spacing-sm);
    align-items: start;
}

.check-icon {
    background: var(--primary-blue);
    color: var(--white);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.advantage-inline strong {
    color: var(--primary-dark);
    display: block;
    margin-bottom: 0.25rem;
}

.advantage-inline p {
    margin: 0;
    font-size: var(--font-size-sm);
}

/* Service Sidebar */
.service-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-box-service {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: var(--white);
    padding: var(--spacing-lg);
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.contact-box-service h3 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.contact-box-service p {
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.btn-block {
    display: block;
    width: 100%;
    justify-content: center;
}

.related-services {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
}

.related-services h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
}

.related-service-item {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    margin: var(--spacing-xs) 0;
    color: var(--dark-gray);
    text-decoration: none;
    border-left: 3px solid var(--medium-gray);
    transition: all var(--transition-fast);
}

.related-service-item:hover {
    border-left-color: var(--primary-blue);
    color: var(--primary-blue);
    padding-left: 1rem;
}

.info-box,
.price-info-box {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: 10px;
    border-left: 4px solid var(--accent-yellow);
}

.info-box h4,
.price-info-box h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
}

.info-box p,
.price-info-box p {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--dark-gray);
}

.small-text {
    font-size: 0.75rem;
    font-style: italic;
    opacity: 0.8;
}

/* Refill Gas Page Specific */
.gas-refill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.gas-refill-item {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: 10px;
}

.gas-refill-item h4 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.step-item {
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: 10px;
    text-align: center;
}

.step-number {
    background: var(--primary-blue);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
}

.step-item h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
}

.step-item p {
    font-size: var(--font-size-sm);
    color: var(--dark-gray);
    margin: 0;
}

/* Mobile Responsive for Service Pages */
@media (max-width: 968px) {
    .service-detail-content {
        grid-template-columns: 1fr;
    }
    
    .feature-boxes,
    .gas-refill-grid,
    .process-steps {
        grid-template-columns: 1fr;
    }
}