/* ===============================================
   Verdanix Energy - Main Stylesheet
   Clean-tech renewable energy design system
   =============================================== */

/* ==========================================================================
   CSS Variables & Color Scheme
   ========================================================================== */
:root {
    /* Primary Colors - Green Energy Theme */
    --color-primary: #10b981;
    --color-primary-dark: #059669;
    --color-primary-light: #34d399;
    --color-primary-lighter: #a7f3d0;
    
    /* Secondary Colors */
    --color-secondary: #0ea5e9;
    --color-secondary-dark: #0284c7;
    --color-accent: #f59e0b;
    
    /* Neutral Colors */
    --color-dark: #0f172a;
    --color-gray-900: #1e293b;
    --color-gray-800: #334155;
    --color-gray-700: #475569;
    --color-gray-600: #64748b;
    --color-gray-500: #94a3b8;
    --color-gray-400: #cbd5e1;
    --color-gray-300: #e2e8f0;
    --color-gray-200: #f1f5f9;
    --color-gray-100: #f8fafc;
    --color-white: #ffffff;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Sora', sans-serif;
    
    /* Font Sizes */
    --fs-xs: 0.75rem;      /* 12px */
    --fs-sm: 0.875rem;     /* 14px */
    --fs-base: 1rem;       /* 16px */
    --fs-lg: 1.125rem;     /* 18px */
    --fs-xl: 1.25rem;      /* 20px */
    --fs-2xl: 1.5rem;      /* 24px */
    --fs-3xl: 1.875rem;    /* 30px */
    --fs-4xl: 2.25rem;     /* 36px */
    --fs-5xl: 3rem;        /* 48px */
    --fs-6xl: 3.75rem;     /* 60px */
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Layout */
    --container-width: 1200px;
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-back: -1;
    --z-normal: 1;
    --z-tooltip: 10;
    --z-fixed: 100;
    --z-modal: 1000;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-size: var(--fs-base);
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--fs-5xl); }
h2 { font-size: var(--fs-4xl); }
h3 { font-size: var(--fs-3xl); }
h4 { font-size: var(--fs-2xl); }
h5 { font-size: var(--fs-xl); }
h6 { font-size: var(--fs-lg); }

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

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section--gray {
    background-color: var(--color-gray-100);
}

.section--dark {
    background-color: var(--color-dark);
    color: var(--color-gray-300);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
    color: var(--color-white);
}

/* Section Headers */
.section__header {
    margin-bottom: var(--spacing-2xl);
}

.section__header--center {
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-2xl);
}

.section__subtitle {
    display: inline-block;
    font-size: var(--fs-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.section__title {
    font-size: var(--fs-4xl);
    margin-bottom: var(--spacing-md);
}

.section__description {
    font-size: var(--fs-lg);
    color: var(--color-gray-600);
    max-width: 700px;
}

.section--dark .section__description {
    color: var(--color-gray-400);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-fixed);
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: 700;
    color: var(--color-dark);
}

.nav__logo i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.nav__menu {
    display: flex;
    align-items: center;
}

.nav__list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav__link {
    font-size: var(--fs-base);
    font-weight: 500;
    color: var(--color-gray-700);
    padding: 0.5rem 0;
    position: relative;
}

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

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

.nav__toggle,
.nav__close {
    display: none;
    font-size: 1.5rem;
    color: var(--color-dark);
    cursor: pointer;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: var(--fs-base);
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
}

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

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn--outline:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn--large {
    padding: 1.125rem 2.25rem;
    font-size: var(--fs-lg);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    padding-top: 140px;
    padding-bottom: var(--spacing-3xl);
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
    z-index: 0;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__content {
    animation: fadeInUp 0.8s ease-out;
}

.hero__subtitle {
    display: inline-block;
    font-size: var(--fs-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.hero__title {
    font-size: var(--fs-6xl);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero__description {
    font-size: var(--fs-xl);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hero__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat__number {
    font-family: var(--font-heading);
    font-size: var(--fs-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat__label {
    font-size: var(--fs-sm);
    color: var(--color-gray-600);
}

.hero__image {
    animation: fadeInRight 0.8s ease-out 0.2s both;
}

.hero__image img {
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    object-fit: cover;
}

.hero__scroll {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.scroll-down {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: 1.25rem;
    animation: bounce 2s infinite;
}

/* ==========================================================================
   Systems Grid
   ========================================================================== */
.systems__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.system-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.system-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.system-card--featured {
    border: 2px solid var(--color-primary);
}

.system-card__badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
}

.system-card__icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    font-size: 1.75rem;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.system-card__title {
    font-size: var(--fs-2xl);
    margin-bottom: var(--spacing-sm);
}

.system-card__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
}

.system-card__features {
    margin-bottom: var(--spacing-md);
}

.system-card__features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    font-size: var(--fs-sm);
    color: var(--color-gray-700);
}

.system-card__features i {
    color: var(--color-primary);
}

.system-card__link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    font-weight: 600;
    font-size: var(--fs-base);
}

.system-card__link:hover {
    gap: 0.75rem;
}

/* ==========================================================================
   Grid Modernization Section
   ========================================================================== */
.grid-mod__wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.grid-mod__content {
    padding: var(--spacing-lg);
}

.grid-mod__text {
    font-size: var(--fs-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

.grid-mod__features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

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

.feature-item__icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary-lighter);
    color: var(--color-primary-dark);
    border-radius: var(--border-radius);
    font-size: 1.5rem;
}

.feature-item__title {
    font-size: var(--fs-xl);
    margin-bottom: 0.5rem;
}

.feature-item__text {
    color: var(--color-gray-600);
}

.grid-mod__visual {
    position: relative;
}

.grid-mod__visual img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
}

.grid-mod__overlay {
    position: absolute;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.overlay-stat__value {
    display: block;
    font-family: var(--font-heading);
    font-size: var(--fs-4xl);
    font-weight: 700;
    color: var(--color-primary);
}

.overlay-stat__label {
    display: block;
    font-size: var(--fs-sm);
    color: var(--color-gray-700);
}

/* ==========================================================================
   Environmental Section
   ========================================================================== */
.environmental__wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.environmental__visual img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
}

.environmental__text {
    font-size: var(--fs-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

.environmental__benefits {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.benefit-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: var(--transition);
}

.benefit-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.benefit-card i {
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.benefit-card h4 {
    font-size: var(--fs-lg);
    margin-bottom: 0.5rem;
}

.benefit-card p {
    font-size: var(--fs-sm);
    color: var(--color-gray-600);
    margin: 0;
}

/* ==========================================================================
   Efficiency Section
   ========================================================================== */
.efficiency__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.efficiency-card {
    background-color: var(--color-gray-900);
    border: 1px solid var(--color-gray-800);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition);
}

.efficiency-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
}

.efficiency-card__header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.efficiency-card__header i {
    font-size: 2rem;
    color: var(--color-primary);
}

.efficiency-card__header h3 {
    color: var(--color-white);
    margin: 0;
}

.efficiency-card p {
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-lg);
}

.efficiency-card__metric {
    display: flex;
    flex-direction: column;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-800);
}

.metric-value {
    font-family: var(--font-heading);
    font-size: var(--fs-4xl);
    font-weight: 700;
    color: var(--color-primary);
}

.metric-label {
    font-size: var(--fs-sm);
    color: var(--color-gray-500);
}

.efficiency__cta {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-gray-900);
    border-radius: var(--border-radius-lg);
}

.efficiency__cta p {
    font-size: var(--fs-xl);
    color: var(--color-gray-300);
    margin-bottom: var(--spacing-md);
}

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta-box {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-3xl) var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.cta-box__title {
    font-size: var(--fs-4xl);
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.cta-box__text {
    font-size: var(--fs-lg);
    opacity: 0.95;
    max-width: 600px;
}

.cta-box__actions {
    display: flex;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

.cta-box .btn--primary {
    background-color: var(--color-white);
    color: var(--color-primary);
}

.cta-box .btn--primary:hover {
    background-color: var(--color-gray-100);
}

.cta-box .btn--outline {
    border-color: var(--color-white);
    color: var(--color-white);
}

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

/* ==========================================================================
   Forms
   ========================================================================== */
.form-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: var(--fs-base);
    font-family: inherit;
    color: var(--color-gray-700);
    background-color: var(--color-gray-100);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-white);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: var(--fs-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin-top: 0.125rem;
}

.checkbox-label a {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: var(--color-dark);
    color: var(--color-gray-400);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer__logo i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.footer__description {
    font-size: var(--fs-sm);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer__social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-gray-800);
    color: var(--color-gray-400);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.footer__title {
    font-size: var(--fs-lg);
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer__links li,
.footer__contact li {
    margin-bottom: 0.75rem;
}

.footer__links a {
    font-size: var(--fs-sm);
    color: var(--color-gray-400);
    transition: var(--transition-fast);
}

.footer__links a:hover {
    color: var(--color-primary);
    padding-left: 0.5rem;
}

.footer__contact li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: var(--fs-sm);
}

.footer__contact i {
    color: var(--color-primary);
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.footer__contact a {
    color: var(--color-gray-400);
}

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

.footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-800);
    font-size: var(--fs-sm);
}

.footer__legal {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer__legal a {
    color: var(--color-gray-400);
}

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

.separator {
    color: var(--color-gray-700);
}

.footer__copyright {
    color: var(--color-gray-500);
    margin: 0;
}

/* ==========================================================================
   Back to Top Button
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: var(--z-tooltip);
}

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

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-5px);
}

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

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Lazy load fade-in */
.lazy-load {
    opacity: 0;
    transition: opacity 0.5s ease-in;
}

.lazy-load.loaded {
    opacity: 1;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet (max-width: 1024px) */
@media screen and (max-width: 1024px) {
    :root {
        --fs-6xl: 3rem;
        --fs-5xl: 2.5rem;
        --fs-4xl: 2rem;
    }
    
    .hero__container,
    .grid-mod__wrapper,
    .environmental__wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero__image,
    .grid-mod__visual {
        order: -1;
    }
    
    .cta-box {
        flex-direction: column;
        text-align: center;
    }
    
    .cta-box__actions {
        justify-content: center;
    }
    
    .footer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile (max-width: 768px) */
@media screen and (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--color-white);
        box-shadow: var(--shadow-xl);
        padding: var(--spacing-2xl) var(--spacing-md);
        transition: var(--transition);
    }
    
    .nav__menu.show {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav__close,
    .nav__toggle {
        display: block;
    }
    
    .nav__close {
        position: absolute;
        top: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero__title {
        font-size: var(--fs-4xl);
    }
    
    .hero__buttons {
        flex-direction: column;
    }
    
    .hero__stats {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .systems__grid {
        grid-template-columns: 1fr;
    }
    
    .environmental__benefits {
        grid-template-columns: 1fr;
    }
    
    .efficiency__grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer__grid {
        grid-template-columns: 1fr;
    }
    
    .footer__bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .cta-box__actions {
        flex-direction: column;
        width: 100%;
    }
    
    .cta-box__actions .btn {
        width: 100%;
    }
}

/* Small Mobile (max-width: 480px) */
@media screen and (max-width: 480px) {
    :root {
        --spacing-3xl: 3rem;
        --spacing-2xl: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero__title {
        font-size: var(--fs-3xl);
    }
    
    .section__title {
        font-size: var(--fs-3xl);
    }
}

/* ==========================================================================
   Cookie Banner
   ========================================================================== */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-fixed);
    transform: translateY(100%);
    transition: transform 0.3s ease-in-out;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-banner__container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.cookie-banner__content {
    flex: 1;
}

.cookie-banner__title {
    font-size: var(--fs-lg);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 0.5rem;
}

.cookie-banner__text {
    font-size: var(--fs-sm);
    color: var(--color-gray-400);
    margin: 0;
}

.cookie-banner__text a {
    color: var(--color-primary);
    text-decoration: underline;
}

.cookie-banner__text a:hover {
    color: var(--color-primary-light);
}

.cookie-banner__actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.cookie-banner__btn {
    padding: 0.75rem 1.5rem;
    font-size: var(--fs-sm);
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.cookie-banner__btn--accept {
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
}

.cookie-banner__btn--accept:hover {
    background-color: var(--color-primary-dark);
}

.cookie-banner__btn--decline {
    background-color: transparent;
    color: var(--color-gray-400);
    border: 1px solid var(--color-gray-700);
}

.cookie-banner__btn--decline:hover {
    background-color: var(--color-gray-800);
    color: var(--color-white);
}

/* Cookie Banner Responsive */
@media screen and (max-width: 768px) {
    .cookie-banner__container {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .cookie-banner__actions {
        width: 100%;
    }
    
    .cookie-banner__btn {
        flex: 1;
    }
}