/* ========================================
   Ecosphere - Professional Solar Design
   Inspired by SunStar Template
   ======================================== */

/* CSS Variables */
:root {
    --primary-color: #2ecc71;
    --primary-dark: #27ae60;
    --secondary-color: #f39c12;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --white: #ffffff;
    --text-dark: #333333;
    --text-light: #666666;
    --border-color: #e0e0e0;

    --font-primary: 'Poppins', sans-serif;
    --transition: all 0.3s ease;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.15);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    position: relative;
    overscroll-behavior: none;
    overscroll-behavior-y: none;
    height: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    overscroll-behavior: none;
    overscroll-behavior-y: none;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-weight: 600;
    font-size: 15px;
    border-radius: 50px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}

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

.btn-hero {
    background: var(--white);
    color: var(--primary-color);
    padding: 16px 40px;
    font-size: 16px;
}

.btn-hero:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(46, 204, 113, 0.4);
}

/* Section Titles */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-badge {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.section-title h2 {
    font-size: 38px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.section-title p {
    font-size: 17px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   HEADER
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: none;
    box-shadow: none;
    transition: all 0.4s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0,0,0,0.12);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 0;
    position: relative;
}

.mobile-only {
    display: none;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 26px;
    font-weight: 700;
    color: var(--white);
    transition: all 0.4s ease;
    flex-shrink: 0;
}

.logo img {
    height: 30px;
    width: 250px;
    object-fit: contain;
    transition: all 0.4s ease;
}

.logo i {
    font-size: 32px;
    color: var(--white);
    transition: all 0.4s ease;
}

.logo span {
    color: var(--white);
    transition: all 0.4s ease;
}

.header.scrolled .logo {
    color: var(--primary-color);
}

.header.scrolled .logo img {
    filter: brightness(0.9);
}

.header.scrolled .logo i {
    color: var(--primary-color);
}

.header.scrolled .logo span {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo:hover {
    transform: translateY(-2px);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--white);
    font-weight: 500;
    font-size: 15px;
    transition: all 0.4s ease;
    position: relative;
    padding: 8px 0;
}

.header.scrolled .nav-link {
    color: var(--dark-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--white);
    transition: all 0.4s ease;
}

.header.scrolled .nav-link::after {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
}

.header.scrolled .nav-link:hover,
.header.scrolled .nav-link.active {
    color: var(--primary-color);
}

.navbar .btn-primary {
    padding: 12px 28px;
    font-size: 14px;
    white-space: nowrap;
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
    box-shadow: none;
    transition: all 0.4s ease;
}

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

.header.scrolled .navbar .btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    border: 2px solid transparent;
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
}

.header.scrolled .navbar .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.4);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-shrink: 0;
}

.admin-link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--white);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.4s ease;
    padding: 8px 0;
}

.admin-link i {
    font-size: 16px;
}

.header.scrolled .admin-link {
    color: var(--text-light);
}

.admin-link:hover {
    color: rgba(255, 255, 255, 0.8);
}

.header.scrolled .admin-link:hover {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
    background: transparent;
    border: none;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--white);
    transition: all 0.4s ease;
    border-radius: 3px;
}

.header.scrolled .hamburger span {
    background: var(--dark-color);
}

.hamburger:hover span {
    background: var(--white);
    opacity: 0.8;
}

.header.scrolled .hamburger:hover span {
    background: var(--primary-color);
    opacity: 1;
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    margin-top: 0;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #1e3c72 0%, #2ecc71 100%);
    top: 0;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(30, 60, 114, 0.85) 0%, rgba(46, 204, 113, 0.75) 100%);
    z-index: 1;
}

.hero-slider {
    position: relative;
    z-index: 2;
    padding: 100px 0 60px;
}

.slide {
    display: none;
}

.slide.active {
    display: block;
}

.slide-content {
    text-align: center;
    color: var(--white);
    animation: fadeInUp 1s ease-out;
}

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

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.slide-content h1 {
    font-size: 52px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.slide-content p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.95;
}

/* Hero Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 80px;
    position: relative;
    z-index: 2;
}

.stat-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 30px 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.stat-box:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
}

/* ========================================
   SERVICES SECTION
   ======================================== */
.services {
    padding: 100px 0;
    background: var(--light-color);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--white);
    border-radius: 12px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    transform: scaleX(0);
    transition: var(--transition);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-card.featured {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    transform: scale(1.05);
}

.service-card.featured:hover {
    transform: scale(1.08) translateY(-10px);
}

.service-card.featured h3,
.service-card.featured p {
    color: var(--white);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--white);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
}

.service-card.featured .service-icon {
    background: var(--white);
    color: var(--primary-color);
}

.service-card h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.service-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-list {
    list-style: none;
    padding: 0;
    margin: 25px 0;
    text-align: left;
}

.service-list li {
    padding: 8px 0;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 10px;
}

.service-list li i {
    color: var(--primary-color);
    font-size: 14px;
}

.service-card.featured .service-list li {
    color: rgba(255, 255, 255, 0.95);
}

.service-card.featured .service-list li i {
    color: var(--white);
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 15px;
    margin-top: 15px;
    transition: var(--transition);
}

.service-link:hover {
    gap: 12px;
}

.service-link i {
    font-size: 14px;
}

.service-card.featured .service-link {
    color: var(--white);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--white);
    color: var(--primary-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ========================================
   ABOUT SECTION
   ======================================== */
.about {
    padding: 100px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.about-text h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 25px;
    line-height: 1.8;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin: 35px 0;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: var(--transition);
}

.about-feature:hover {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    transform: translateX(5px);
}

.feature-icon {
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
    flex-shrink: 0;
}

.feature-content h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 6px;
}

.feature-content p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
    line-height: 1.6;
}

.experience-badge {
    position: absolute;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(46, 204, 113, 0.4);
}

.experience-number {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 5px;
}

.experience-text {
    font-size: 13px;
    font-weight: 500;
    opacity: 0.95;
}

/* ========================================
   TESTIMONIALS SECTION
   ======================================== */
.testimonials {
    padding: 100px 0;
    background: var(--light-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background: var(--white);
    border-radius: 12px;
    padding: 35px 30px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
}

.testimonial-card::before {
    content: '\201C';
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 80px;
    color: var(--primary-color);
    opacity: 0.1;
    font-family: Georgia, serif;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-stars {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
}

.testimonial-stars i {
    color: var(--secondary-color);
    font-size: 16px;
}

.testimonial-text {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 25px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
}

.author-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 3px;
}

.author-info p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
}

/* ========================================
   CONTACT SECTION
   ======================================== */
.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.section-badge.light {
    color: var(--primary-color);
    background: rgba(46, 204, 113, 0.1);
    padding: 6px 16px;
    border-radius: 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 38px;
    font-weight: 700;
    color: var(--dark-color);
    margin: 15px 0;
}

.section-header p {
    font-size: 17px;
    color: var(--text-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 40px;
    align-items: start;
}

.contact-form {
    background: var(--white);
    padding: 45px 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 10px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group label i {
    color: var(--primary-color);
    margin-right: 8px;
    font-size: 16px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 15px 18px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-family: var(--font-primary);
    font-size: 15px;
    transition: var(--transition);
    background: #fafafa;
    color: var(--dark-color);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(46, 204, 113, 0.08);
    transform: translateY(-2px);
}

.form-group textarea {
    resize: vertical;
    min-height: 180px;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%232ecc71' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px;
}

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 16px 32px;
    font-weight: 600;
    font-size: 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(46, 204, 113, 0.3);
    margin-top: 10px;
}

.btn-submit:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(46, 204, 113, 0.4);
}

.btn-submit i {
    margin-left: 8px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-box {
    background: var(--white);
    border: 2px solid #e9ecef;
    padding: 25px;
    border-radius: 12px;
    transition: var(--transition);
    display: flex;
    align-items: start;
    gap: 18px;
}

.info-box:hover {
    transform: translateX(5px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(46, 204, 113, 0.15);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--white);
    flex-shrink: 0;
}

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

.info-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin: 0;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--dark-color);
    color: var(--light-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col {
    display: flex;
    flex-direction: column;
}

.footer-col h4 {
    color: var(--white);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 15px;
}

.footer-logo img {
    height: 30px;
    width: 250px;
    object-fit: contain;
}

.footer-logo i {
    font-size: 28px;
    color: var(--primary-color);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--light-color);
    opacity: 0.85;
    margin-bottom: 10px;
}

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

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: var(--light-color);
    font-size: 14px;
    opacity: 0.85;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-col ul li a:hover {
    opacity: 1;
    color: var(--primary-color);
    transform: translateX(5px);
}

.footer-contact li {
    display: flex;
    align-items: start;
    gap: 12px;
    margin-bottom: 15px;
    color: var(--light-color);
    opacity: 0.85;
    font-size: 14px;
    line-height: 1.6;
}

.footer-contact li i {
    color: var(--primary-color);
    font-size: 16px;
    margin-top: 2px;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-bottom p {
    font-size: 14px;
    opacity: 0.7;
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 25px;
}

.footer-links a {
    color: var(--light-color);
    font-size: 14px;
    opacity: 0.7;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-color);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .service-card.featured {
        transform: scale(1);
    }

    .about-content {
        gap: 40px;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 1150px) {
    /* Header Mobile */
    .navbar {
        padding: 12px 0;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 300px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 30px 30px;
        box-shadow: 0 0 50px rgba(0,0,0,0.2);
        transition: var(--transition);
        gap: 0;
        z-index: 999;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-link {
        display: block;
        padding: 18px 0;
        width: 100%;
        color: var(--dark-color) !important;
    }

    .nav-link::after {
        display: none;
    }

    .nav-link i {
        margin-right: 8px;
        color: var(--primary-color);
    }

    .navbar .btn-primary {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .mobile-only {
        display: block;
    }

    .header-actions {
        display: none;
    }

    .logo img {
        height: 30px;
        width: 250px;
    }

    .nav-menu {
        justify-content: flex-start;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(9px, 9px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }

    /* Hero Mobile */
    .hero {
        margin-top: 0;
        min-height: 100vh;
        padding-top: 80px;
        background-image: url('/static/images/hero-mobile-bg.jpg?v=1.2');
        background-size: cover;
        background-position: center;
        background-attachment: scroll;
        top: 0;
    }

    .hero-video {
        display: none;
    }

    .hero-slider {
        padding: 60px 0 40px;
    }

    .slide-content h1 {
        font-size: 32px;
    }

    .slide-content p {
        font-size: 16px;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 15px;
        margin-bottom: 40px;
    }

    .stat-box {
        padding: 25px 20px;
    }

    /* Sections Mobile */
    .section-title h2 {
        font-size: 28px;
    }

    .services-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

    .about-image {
        order: -1;
    }

    .experience-badge {
        bottom: 20px;
        right: 20px;
        padding: 20px;
    }

    .experience-number {
        font-size: 28px;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-form {
        padding: 35px 25px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .slide-content h1 {
        font-size: 26px;
    }

    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }

    .stat-number {
        font-size: 32px;
    }

    .service-icon {
        width: 60px;
        height: 60px;
        font-size: 28px;
    }
}