/* MOBILE FIRST CSS - Херсон Теплосети */

/* =====================================
   БАЗОВЫЕ СТИЛИ (Mobile First - 320px+)
   ===================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #374151;
    --accent-color: #3B82F6;
    --light-gray: #E5E7EB;
    --dark-gray: #6B7280;
    --white: #FFFFFF;
    --section-padding: 60px 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    color: var(--primary-color);
    background-color: var(--white);
    font-size: 16px;
}

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

/* =====================================
   HEADER - MOBILE FIRST
   ===================================== */
.header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(55, 65, 81, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    position: relative;
}

.logo {
    height: 40px;
}

.header-phone {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s;
}

.header-phone:hover {
    color: #2563EB;
}

/* BURGER MENU - MOBILE */
.burger {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    transition: transform 0.3s ease;
}

.burger:hover {
    transform: scale(1.05);
}

.burger-line {
    width: 24px;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

/* Burger animation when active */
.burger.active .burger-line:nth-child(1) {
    transform: rotate(45deg) translate(6.5px, 6px);
}

.burger.active .burger-line:nth-child(2) {
    opacity: 0;
}

.burger.active .burger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* MOBILE NAVIGATION */
.nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    height: calc(100vh - 64px);
    background: var(--white);
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    overflow-y: auto;
    box-shadow: 0 4px 25px rgba(55, 65, 81, 0.15);
    z-index: 999;
}

.nav.active {
    transform: translateX(0);
}

.nav ul {
    list-style: none;
    padding: 15px 0;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.nav li {
    position: relative;
    border-bottom: 1px solid var(--light-gray);
}

.nav li:last-child {
    border-bottom: none;
}

.nav a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 16px;
    display: block;
    padding: 16px 20px;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav a:hover {
color: var(--accent-color);
background: #f8fafc;
border-left-color: var(--accent-color);
}

/* MOBILE DROPDOWN STYLES */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    position: relative;
}

.dropdown-toggle::after {
    content: '▼';
    font-size: 10px;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    transition: transform 0.3s ease;
}

.dropdown.active .dropdown-toggle::after {
    transform: translateY(-50%) rotate(180deg);
}

.dropdown-menu {
    background: var(--light-gray);
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0;
}

.dropdown.active .dropdown-menu {
    max-height: 300px;
    padding: 8px 0;
}

.dropdown-menu a {
    font-size: 14px;
    padding: 12px 35px;
    color: var(--dark-gray);
    border-left: none;
    background: transparent;
}

.dropdown-menu a:hover {
background: var(--white);
color: var(--accent-color);
}

/* =====================================
   BUTTONS - MOBILE FIRST
   ===================================== */
.cta-btn {
    background: var(--accent-color);
    color: var(--white);
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
}

.cta-btn:hover {
    background: #2563EB;
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    font-size: 14px;
}

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

/* =====================================
   HERO SECTION - MOBILE FIRST
   ===================================== */
.hero {
    padding: 80px 0 50px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    text-align: center;
}

.hero h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero .subtitle {
    font-size: 16px;
    color: var(--dark-gray);
    margin-bottom: 20px;
}

.hero .benefits {
    font-size: 14px;
    color: var(--accent-color);
    margin-bottom: 30px;
    font-weight: 500;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* =====================================
   SECTIONS - MOBILE FIRST
   ===================================== */
.section-title {
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 40px;
    line-height: 1.3;
}

/* SERVICES SECTION */
.services {
    padding: var(--section-padding);
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
    margin-bottom: 40px;
}

.service-card {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 12px;
    box-shadow: 0 4px 25px rgba(55, 65, 81, 0.1);
    text-align: center;
    transition: transform 0.3s;
}

.service-card:hover {
    transform: translateY(-3px);
}

.service-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, var(--accent-color), #2563EB);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: var(--white);
    font-size: 20px;
}

.service-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--dark-gray);
    margin-bottom: 20px;
    font-size: 15px;
    line-height: 1.5;
}

/* ADVANTAGES SECTION */
.advantages {
    padding: var(--section-padding);
    background: #f8fafc;
}

.advantages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.advantage-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    flex-shrink: 0;
    font-size: 18px;
}

.advantage-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.advantage-content p {
    color: var(--dark-gray);
    font-size: 14px;
    line-height: 1.4;
}

/* PORTFOLIO SECTION */
.portfolio {
    padding: var(--section-padding);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 40px;
}

.portfolio-item {
    background: var(--light-gray);
    aspect-ratio: 4/3;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.portfolio-item::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    border-radius: 50%;
    opacity: 0.8;
}

.portfolio-item::before {
    content: '📷';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 20px;
    z-index: 1;
}

.portfolio-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(55, 65, 81, 0.9));
    color: var(--white);
    padding: 15px;
    font-size: 13px;
    line-height: 1.3;
}

/* CONTACT SECTION */
.contact {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--primary-color) 0%, #1f2937 100%);
    color: var(--white);
}

.contact .section-title {
    color: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: start;
}

.contact-form {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 12px;
    color: var(--primary-color);
}

.contact-form h3 {
    font-size: 20px;
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--light-gray);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

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

.contact-info h3 {
    font-size: 20px;
    margin-bottom: 25px;
}

.contact-item {
    margin-bottom: 20px;
}

.contact-item strong {
    color: var(--accent-color);
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
}

.contact-item div {
    font-size: 14px;
    line-height: 1.4;
}

/* FOOTER */
.footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 30px 0;
    font-size: 14px;
}

/* =====================================
   SERVICE PAGES - MOBILE FIRST
   ===================================== */

/* BREADCRUMBS */
.breadcrumbs {
    padding: 15px 0;
    background: var(--light-gray);
    font-size: 12px;
    margin-top: 64px;
}

.breadcrumbs a {
    color: var(--dark-gray);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--accent-color);
}

.breadcrumbs span {
    color: var(--dark-gray);
    margin: 0 6px;
}

/* SERVICE HERO */
.service-hero {
    padding: 50px 0 40px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    text-align: center;
}

.service-hero h1 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.service-hero .subtitle {
    font-size: 14px;
    color: var(--dark-gray);
    margin-bottom: 20px;
    line-height: 1.4;
}

.service-hero .price {
    font-size: 18px;
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 25px;
}

.service-benefits {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 25px 0;
    text-align: left;
}

.service-benefit {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--primary-color);
}

.service-benefit::before {
    content: '✅';
    font-size: 14px;
    flex-shrink: 0;
}

/* CONTENT SECTIONS */
.content-section {
    padding: 50px 0;
}

.content-section:nth-child(even) {
    background: #f8fafc;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.content-list {
    list-style: none;
    padding: 0;
}

.content-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.content-list li:last-child {
    border-bottom: none;
}

.list-number {
    background: var(--accent-color);
    color: var(--white);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
    font-size: 12px;
}

.list-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.list-content p {
    color: var(--dark-gray);
    font-size: 13px;
    line-height: 1.4;
}

/* PRICE TABLE */
.price-table {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 25px rgba(55, 65, 81, 0.1);
    margin: 25px 0;
    overflow-x: auto;
}

.price-table table {
    width: 100%;
    border-collapse: collapse;
    min-width: 400px;
}

.price-table th {
    background: var(--accent-color);
    color: var(--white);
    padding: 15px 12px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
}

.price-table td {
    padding: 12px;
    border-bottom: 1px solid var(--light-gray);
    font-size: 13px;
}

.price-table tr:last-child td {
    border-bottom: none;
}

.price-table tr:hover {
    background: #f8fafc;
}

.price {
    font-weight: bold;
    color: var(--accent-color);
}

/* MATERIALS SECTION */
.materials-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin: 25px 0;
}

.material-item {
    background: var(--white);
    padding: 16px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(55, 65, 81, 0.1);
}

.material-item h4 {
    color: var(--accent-color);
    margin-bottom: 8px;
    font-size: 15px;
}

.material-item p {
    font-size: 13px;
    color: var(--dark-gray);
    line-height: 1.4;
}

/* STEPS TIMELINE */
.steps-timeline {
    position: relative;
    padding-left: 30px;
}

.steps-timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--light-gray);
}

.step-item {
    position: relative;
    margin-bottom: 30px;
}

.step-item::before {
    content: '';
    position: absolute;
    left: -25px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 2px solid var(--white);
    box-shadow: 0 0 0 2px var(--accent-color);
}

.step-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--primary-color);
}

.step-duration {
    font-size: 12px;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 4px;
}

.step-content p {
    color: var(--dark-gray);
    font-size: 13px;
    line-height: 1.4;
}

/* SERVICE CONTACT FORM */
.service-contact {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1f2937 100%);
    padding: var(--section-padding);
    color: var(--white);
}

.service-contact .section-title {
    color: var(--white);
}

.service-form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: start;
}

/* UTILITY CLASSES */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mb-40 { margin-bottom: 40px; }
.mb-30 { margin-bottom: 30px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.ml-20 { margin-left: 20px; }

/* ANIMATIONS */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

/* SPECIFIC BUTTON STYLES */
.advantages .text-center .cta-btn {
    margin-top: 40px;
}

/* PORTFOLIO BUTTONS ROW */
.portfolio-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

/* =====================================
   TABLET - 480px+
   ===================================== */
@media (min-width: 480px) {
    .container {
        padding: 0 20px;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero .subtitle {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .service-hero h1 {
        font-size: 24px;
    }
    
    .service-hero .price {
        font-size: 20px;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .service-benefits {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .materials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* =====================================
   TABLET LARGE - 768px+
   ===================================== */
@media (min-width: 768px) {
    :root {
        --section-padding: 80px 0;
    }
    
    .container {
        padding: 0 30px;
    }
    
    /* HEADER DESKTOP */
    .header-content {
        padding: 15px 0;
    }
    
    .logo {
        height: 50px;
    }
    
    .header-phone {
        font-size: 16px;
    }
    
    /* Hide burger menu */
    .burger {
        display: none;
    }
    
    /* Show regular navigation */
    .nav {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        transform: none;
        transition: none;
        box-shadow: none;
        overflow: visible;
    }
    
    .nav ul {
        display: flex;
        flex-direction: row;
        gap: 25px;
        padding: 0;
    }
    
    .nav li {
        border-bottom: none;
    }
    
    .nav a {
        font-size: 15px;
        padding: 8px 0;
        border-left: none;
    }
    
    .nav a:hover {
        background: transparent;
    }
    
    /* Desktop Dropdown */
    .dropdown {
        position: relative;
    }
    
    .dropdown-toggle::after {
        position: static;
        right: auto;
        top: auto;
        transform: none;
        margin-left: 5px;
        font-size: 9px;
        display: inline-block;
        transition: transform 0.3s ease;
    }
    
    .dropdown:hover .dropdown-toggle::after {
        transform: rotate(180deg);
    }
    
    .dropdown-menu {
        position: absolute;
        top: 100%;
        left: 0;
        background: var(--white);
        min-width: 260px;
        box-shadow: 0 8px 25px rgba(55, 65, 81, 0.15);
        border-radius: 8px;
        padding: 12px 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
        border: 1px solid var(--light-gray);
        overflow: visible;
        pointer-events: none;
    }
    
    .dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
    }
    
    .dropdown-menu a {
        padding: 10px 16px;
        font-size: 14px;
        color: var(--primary-color);
        border-left: 3px solid transparent;
    }
    
    .dropdown-menu a:hover {
        background: #f8fafc;
        color: var(--accent-color);
        border-left-color: var(--accent-color);
    }
    
    /* Desktop dropdown menu items - специфичный padding для навигации */
    .nav .dropdown-menu a {
        padding: 10px;
    }
    
    /* BREADCRUMBS */
    .breadcrumbs {
        font-size: 14px;
        padding: 20px 0;
        margin-top: 80px;
    }
    
    .breadcrumbs span {
        margin: 0 8px;
    }
    
    /* HERO */
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero h1 {
        font-size: 42px;
    }
    
    .hero .subtitle {
        font-size: 22px;
    }
    
    .hero .benefits {
        font-size: 16px;
    }
    
    .cta-btn {
        padding: 12px 24px;
        font-size: 15px;
    }
    
    .btn-secondary {
        padding: 12px 24px;
        font-size: 15px;
    }
    
    /* SECTIONS */
    .section-title {
        font-size: 32px;
        margin-bottom: 50px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
        margin-bottom: 50px;
    }
    
    .service-card {
        padding: 35px 25px;
    }
    
    .service-icon {
        width: 60px;
        height: 60px;
        font-size: 24px;
        margin-bottom: 20px;
    }
    
    .service-card h3 {
        font-size: 19px;
        margin-bottom: 15px;
    }
    
    .service-card p {
        font-size: 15px;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 35px;
    }
    
    .advantage-icon {
        width: 45px;
        height: 45px;
    }
    
    .advantage-content h3 {
        font-size: 17px;
        margin-bottom: 8px;
    }
    
    .advantage-content p {
        font-size: 15px;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
        margin-bottom: 50px;
    }
    
    .portfolio-caption {
        padding: 18px;
        font-size: 14px;
    }
    
    .contact-content {
        grid-template-columns: 1fr 1fr;
        gap: 50px;
    }
    
    .contact-form {
        padding: 35px 30px;
    }
    
    .contact-form h3 {
        font-size: 22px;
        margin-bottom: 30px;
    }
    
    .form-group {
        margin-bottom: 20px;
    }
    
    .form-group label {
        font-size: 15px;
        margin-bottom: 8px;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 12px 15px;
        font-size: 15px;
    }
    
    .contact-info h3 {
        font-size: 22px;
        margin-bottom: 30px;
    }
    
    .contact-item {
        margin-bottom: 25px;
    }
    
    .contact-item strong {
        font-size: 15px;
        margin-bottom: 5px;
    }
    
    .contact-item div {
        font-size: 15px;
    }
    
    /* SERVICE PAGES */
    .service-hero {
        padding: 100px 0 60px;
    }
    
    .service-hero h1 {
        font-size: 36px;
    }
    
    .service-hero .subtitle {
        font-size: 18px;
    }
    
    .service-hero .price {
        font-size: 22px;
    }
    
    .service-benefits {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        text-align: left;
    }
    
    .service-benefit {
        font-size: 15px;
    }
    
    .content-section {
        padding: 70px 0;
    }
    
    .content-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    
    .list-number {
        width: 28px;
        height: 28px;
        font-size: 14px;
    }
    
    .list-content h4 {
        font-size: 17px;
        margin-bottom: 6px;
    }
    
    .list-content p {
        font-size: 14px;
    }
    
    .materials-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .material-item {
        padding: 20px;
    }
    
    .material-item h4 {
        font-size: 16px;
        margin-bottom: 10px;
    }
    
    .material-item p {
        font-size: 14px;
    }
    
    .steps-timeline {
        padding-left: 40px;
    }
    
    .step-item {
        margin-bottom: 35px;
    }
    
    .step-item::before {
        width: 14px;
        height: 14px;
        left: -30px;
    }
    
    .step-content h4 {
        font-size: 17px;
        margin-bottom: 8px;
    }
    
    .step-duration {
        font-size: 13px;
        margin-bottom: 5px;
    }
    
    .step-content p {
        font-size: 14px;
    }
    
    .service-form-grid {
        grid-template-columns: 1fr 1fr;
        gap: 50px;
    }
    
    .price-table th {
        padding: 18px 15px;
        font-size: 15px;
    }
    
    .price-table td {
        padding: 15px;
        font-size: 14px;
    }
}

/* =====================================
   DESKTOP - 1024px+
   ===================================== */
@media (min-width: 1024px) {
    .nav ul {
        gap: 30px;
    }
    
    .nav a {
        font-size: 16px;
        padding: 10px 0;
    }
    
    .hero h1 {
        font-size: 48px;
    }
    
    .hero .subtitle {
        font-size: 24px;
    }
    
    .hero .benefits {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 36px;
        margin-bottom: 60px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 35px;
    }
    
    .service-card {
        padding: 40px 30px;
    }
    
    .service-card h3 {
        font-size: 20px;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    
    .advantage-content h3 {
        font-size: 18px;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
    
    .contact-content {
        gap: 60px;
    }
    
    .contact-form {
        padding: 40px;
    }
    
    .service-hero h1 {
        font-size: 42px;
    }
    
    .service-hero .subtitle {
        font-size: 20px;
    }
    
    .service-hero .price {
        font-size: 24px;
    }
    
    .service-benefits {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .content-section {
        padding: 80px 0;
    }
    
    .materials-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .step-item {
        margin-bottom: 40px;
    }
    
    .step-content h4 {
        font-size: 18px;
    }
    
    .step-duration {
        font-size: 14px;
    }
    
    .step-content p {
        font-size: 15px;
    }
}

/* =====================================
   404 ERROR PAGE - MOBILE FIRST
   ===================================== */
.error-404 {
    min-height: calc(100vh - 140px);
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 80px 0 50px;
}

.error-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.error-icon {
    width: 120px;
    height: 120px;
    background: linear-gradient(45deg, var(--accent-color), #2563EB);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 30px;
    font-size: 48px;
    color: white;
}

.error-code {
    font-size: 72px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
    line-height: 1;
}

.error-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.error-description {
    font-size: 18px;
    color: var(--dark-gray);
    margin-bottom: 40px;
    line-height: 1.5;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.error-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.error-contacts {
    border-top: 1px solid var(--light-gray);
    padding-top: 30px;
    margin-top: 30px;
}

.contact-text {
    color: var(--dark-gray);
    margin-bottom: 16px;
    font-size: 16px;
}

.contact-links {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.contact-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: color 0.3s;
}

.contact-link:hover {
    color: #2563EB;
}

.emergency-text {
    color: var(--dark-gray);
    font-size: 14px;
}

/* 404 ERROR PAGE - TABLET */
@media (min-width: 768px) {
    .error-404 {
        padding: 120px 0 80px;
    }
    
    .error-code {
        font-size: 96px;
    }
    
    .error-title {
        font-size: 32px;
    }
    
    .error-description {
        font-size: 20px;
    }
    
    .contact-text {
        font-size: 18px;
    }
    
    .contact-link {
        font-size: 18px;
    }
    
    .emergency-text {
        font-size: 16px;
    }
}

/* 404 ERROR PAGE - DESKTOP */
@media (min-width: 1024px) {
    .error-code {
        font-size: 120px;
    }
    
    .error-title {
        font-size: 36px;
    }
    
    .error-description {
        font-size: 22px;
    }
}

/* =====================================
   BLOG ARTICLE STYLES - MOBILE FIRST (BEM)
   ===================================== */

/* Blog Article Block */
.blog-article {
    max-width: 800px;
    margin: 0 auto;
}

/* Blog Hero Image */
.blog-article__hero {
    width: 100%;
    max-width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 8px 30px rgba(55, 65, 81, 0.15);
}

/* Table of Contents */
.blog-article__toc {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(55, 65, 81, 0.1);
    margin-bottom: 30px;
    border-left: 4px solid var(--accent-color);
}

.blog-article__toc li {
    margin-bottom: 8px;
}

.blog-article__toc a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
    display: block;
    padding: 5px 0;
}

.blog-article__toc a:hover {
    color: var(--accent-color);
    padding-left: 8px;
}

/* FAQ Section */
.faq-item {
    background: var(--white);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(55, 65, 81, 0.08);
    border-left: 4px solid var(--accent-color);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(55, 65, 81, 0.15);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 600;
}

.faq-item p {
    color: var(--dark-gray);
    line-height: 1.6;
    margin: 0;
    font-size: 14px;
}

/* Enhanced Info Boxes */
.blog-article__info-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 25px;
    border-radius: 12px;
    margin: 25px 0;
    border-left: 5px solid var(--accent-color);
    position: relative;
    overflow: hidden;
}

.blog-article__info-box::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(45deg, rgba(59, 130, 246, 0.1), transparent);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.blog-article__info-box--warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-left-color: #f59e0b;
}

.blog-article__info-box--warning::before {
    background: linear-gradient(45deg, rgba(245, 158, 11, 0.1), transparent);
}

.blog-article__info-box--success {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-left-color: #10b981;
}

.blog-article__info-box--success::before {
    background: linear-gradient(45deg, rgba(16, 185, 129, 0.1), transparent);
}

.blog-article__info-box--danger {
    background: linear-gradient(135deg, #fef2f2 0%, #fecaca 100%);
    border-left-color: #ef4444;
}

.blog-article__info-box--danger::before {
    background: linear-gradient(45deg, rgba(239, 68, 68, 0.1), transparent);
}

/* Quote Blocks */
.blog-article__quote {
    background: var(--white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(55, 65, 81, 0.1);
    margin: 30px 0;
    position: relative;
    border-left: 5px solid var(--accent-color);
}

.blog-article__quote::before {
    content: '"';
    position: absolute;
    top: -10px;
    left: 20px;
    font-size: 60px;
    color: var(--accent-color);
    opacity: 0.3;
    font-family: Georgia, serif;
}

.blog-article__quote-text {
    font-size: 18px;
    font-style: italic;
    line-height: 1.6;
    color: var(--primary-color);
    margin-bottom: 15px;
    padding-left: 20px;
}

.blog-article__quote-author {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 14px;
    text-align: right;
}

/* Statistics Grid */
.blog-article__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.blog-article__stat {
    background: var(--white);
    padding: 25px 15px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(55, 65, 81, 0.1);
    border-top: 4px solid var(--accent-color);
    transition: transform 0.3s ease;
}

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

.blog-article__stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: 8px;
}

.blog-article__stat-label {
    font-size: 12px;
    color: var(--dark-gray);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Enhanced Step by Step */
.blog-article__steps {
    margin: 30px 0;
}

.blog-article__step {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 2px 15px rgba(55, 65, 81, 0.08);
    border-left: 4px solid var(--accent-color);
    position: relative;
    transition: all 0.3s ease;
}

.blog-article__step:hover {
    transform: translateX(5px);
    box-shadow: 0 8px 25px rgba(55, 65, 81, 0.15);
}

.blog-article__step-number {
    position: absolute;
    top: -15px;
    left: 20px;
    background: var(--accent-color);
    color: var(--white);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

.blog-article__step-title {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 16px;
    font-weight: 600;
    padding-left: 15px;
}

.blog-article__step-description {
    color: var(--dark-gray);
    line-height: 1.6;
    font-size: 14px;
    padding-left: 15px;
}

/* Image Gallery */
.blog-article__gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 30px 0;
}

.blog-article__gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(55, 65, 81, 0.1);
    transition: transform 0.3s ease;
}

.blog-article__gallery-item:hover {
    transform: scale(1.05);
}

.blog-article__gallery-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.blog-article__gallery-item:hover .blog-article__gallery-image {
    transform: scale(1.1);
}

/* Checklist */
.blog-article__checklist {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    margin: 25px 0;
    box-shadow: 0 4px 15px rgba(55, 65, 81, 0.1);
}

.blog-article__checklist-title {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.blog-article__checklist-title::before {
    content: '✅';
    font-size: 20px;
}

.blog-article__checklist-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.blog-article__checklist-item:hover {
    background: #f8fafc;
}

.blog-article__checklist-item::before {
    content: '☐';
    font-size: 16px;
    color: var(--accent-color);
    margin-top: 2px;
}

.blog-article__checklist-item--checked::before {
    content: '✅';
}

.blog-article__checklist-text {
    color: var(--primary-color);
    font-size: 14px;
    line-height: 1.5;
}

/* Progress Bar */
.blog-article__progress {
    background: var(--light-gray);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    margin: 20px 0;
}

.blog-article__progress-fill {
    background: linear-gradient(45deg, var(--accent-color), #2563EB);
    height: 100%;
    border-radius: 4px;
    transition: width 0.8s ease;
}

/* Video Embed */
.blog-article__video {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 8px 25px rgba(55, 65, 81, 0.15);
}

.blog-article__video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Social Share */
.blog-article__share {
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    margin: 30px 0;
    box-shadow: 0 2px 15px rgba(55, 65, 81, 0.08);
}

.blog-article__share-title {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 600;
}

.blog-article__share-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.blog-article__share-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.blog-article__share-button:hover {
    transform: translateY(-2px);
}

.blog-article__share-button--facebook {
    background: #1877f2;
    color: white;
}

.blog-article__share-button--twitter {
    background: #1da1f2;
    color: white;
}

.blog-article__share-button--whatsapp {
    background: #25d366;
    color: white;
}

.blog-article__share-button--telegram {
    background: #0088cc;
    color: white;
}

/* Article Meta */
.blog-article__meta {
    color: var(--accent-color);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
}

/* Article Intro */
.blog-article__intro {
    font-size: 18px;
    line-height: 1.6;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.blog-article__intro--secondary {
    font-size: 16px;
    color: var(--dark-gray);
    margin-bottom: 30px;
}

/* Article Section */
.blog-article__section {
    margin-bottom: 40px;
}

/* Article Titles */
.blog-article__title {
    color: var(--primary-color);
    margin-bottom: 20px;
    border-left: 4px solid var(--accent-color);
    padding-left: 20px;
}

.blog-article__title--centered {
    border-left: none;
    padding-left: 0;
    margin-bottom: 30px;
    text-align: center;
}

/* Article Text */
.blog-article__text {
    line-height: 1.6;
    margin-bottom: 15px;
}

.blog-article__text--large {
    font-size: 18px;
    line-height: 1.6;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* Article Lists */
.blog-article__list {
    margin-left: 20px;
    margin-bottom: 15px;
}

.blog-article__list-item {
    margin-bottom: 8px;
}

/* Article Highlights */
.blog-article__highlight {
    background: #f0f9ff;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    margin-bottom: 15px;
}

.blog-article__highlight--warning {
    background: #fef3c7;
    border-left-color: #f59e0b;
}

.blog-article__highlight--success {
    background: #f0fdf4;
    border-left-color: #10b981;
}

.blog-article__highlight--blue {
    background: #f0f9ff;
    padding: 30px;
    border-radius: 12px;
}

/* Highlight Content */
.blog-article__highlight-title {
    font-weight: 600;
    margin-bottom: 10px;
}

.blog-article__highlight-title--blue {
    color: var(--accent-color);
}

.blog-article__highlight-title--warning {
    color: #d97706;
}

.blog-article__highlight-title--success {
    color: #059669;
}

.blog-article__highlight-list {
    margin-left: 20px;
    margin-top: 10px;
}

/* Article Cards Grid */
.blog-article__cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.blog-article__card {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(55, 65, 81, 0.1);
}

.blog-article__card-title {
    color: var(--accent-color);
    margin-bottom: 15px;
    font-size: 16px;
}

.blog-article__card-text {
    font-size: 14px;
    line-height: 1.5;
}

/* Energy Efficiency Classes */
.blog-article__efficiency {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
}

.blog-article__efficiency-grid {
    display: grid;
    gap: 10px;
}

.blog-article__efficiency-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
}

.blog-article__efficiency-class {
    padding: 5px 10px;
    border-radius: 4px;
    font-weight: bold;
    color: white;
    min-width: 50px;
    text-align: center;
    font-size: 12px;
}

.blog-article__efficiency-class--a3 {
    background: #10b981;
}

.blog-article__efficiency-class--a2 {
    background: #22c55e;
}

.blog-article__efficiency-class--a1 {
    background: #84cc16;
}

.blog-article__efficiency-class--low {
    background: #ef4444;
}

.blog-article__efficiency-text {
    font-size: 14px;
    flex: 1;
}

/* Article Conclusion */
.blog-article__conclusion {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1f2937 100%);
    padding: 40px;
    border-radius: 12px;
    color: var(--white);
    margin-bottom: 40px;
}

.blog-article__conclusion--success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.blog-article__conclusion-title {
    color: var(--white);
    margin-bottom: 20px;
}

.blog-article__conclusion-text {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 20px;
}

/* Calculation Blocks */
.blog-article__calculation {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.blog-article__calculation-title {
    color: var(--white);
    margin-bottom: 15px;
    font-size: 16px;
}

.blog-article__calculation-list {
    margin-left: 15px;
    font-size: 14px;
}

.blog-article__calculation-total {
    font-size: 18px;
    font-weight: 600;
    margin-top: 15px;
}

.blog-article__savings {
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary-color);
    padding: 20px;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
}

.blog-article__savings-amount {
    font-size: 20px;
    margin-bottom: 10px;
}

.blog-article__savings-yearly {
    font-size: 16px;
}

/* Service Icons with Custom Colors */
.blog-article__service-icon--green {
    background: #10b981 !important;
}

.blog-article__service-icon--blue {
    background: #3b82f6 !important;
}

.blog-article__service-icon--purple {
    background: #8b5cf6 !important;
}

.blog-article__service-icon--orange {
    background: #f59e0b !important;
}

/* Additional Text Styles */
.blog-article__note {
    font-size: 14px;
    color: var(--dark-gray);
    margin-top: 15px;
}

.blog-article__strong {
    font-weight: 600;
}

/* Background Utilities */
.bg-light {
    background: #f8fafc;
}

/* Margin Utilities */
.mt-15 {
    margin-top: 15px;
    text-align: left;
    font-size: 14px;
}

.mb-20 {
    margin-bottom: 20px;
}

/* Footer Styles for Blog */
.footer__blog-subtitle {
    margin-top: 10px;
    color: var(--dark-gray);
}

/* Tablet - 480px+ */
@media (min-width: 480px) {
    .blog-article__cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .blog-article__meta {
        font-size: 15px;
    }
    
    .blog-article__intro {
        font-size: 19px;
    }
}

/* Tablet - 768px+ */
@media (min-width: 768px) {
    .blog-article__meta {
        font-size: 16px;
    }
    
    .blog-article__intro {
        font-size: 20px;
    }
    
    .blog-article__intro--secondary {
        font-size: 17px;
    }
    
    .blog-article__text--large {
        font-size: 19px;
    }
    
    .blog-article__card-title {
        font-size: 17px;
    }
    
    .blog-article__card-text {
        font-size: 15px;
    }
    
    .blog-article__efficiency-class {
        font-size: 13px;
        min-width: 55px;
    }
    
    .blog-article__efficiency-text {
        font-size: 15px;
    }
    
    .blog-article__conclusion {
        padding: 45px;
    }
    
    .blog-article__conclusion-text {
        font-size: 19px;
    }
}

/* Desktop - 1024px+ */
@media (min-width: 1024px) {
    .blog-article__meta {
        font-size: 17px;
    }
    
    .blog-article__intro {
        font-size: 22px;
    }
    
    .blog-article__intro--secondary {
        font-size: 18px;
    }
    
    .blog-article__text--large {
        font-size: 20px;
    }
    
    .blog-article__conclusion {
        padding: 50px;
    }
    
    .blog-article__conclusion-text {
        font-size: 20px;
    }
}