/* =========================================
   CSS Variables & Core Setup
   ========================================= */
:root {
    --color-white: #ffffff;
    --color-bg-light: #f8fafc;
    --color-slate-dark: #0f172a; /* Deep slate/navy for text and contrast */
    --color-slate-medium: #334155;
    --color-ice-blue: #0ea5e9; /* Vibrant cyan/ice-blue accent */
    --color-ice-blue-hover: #0284c7;

    --font-primary: 'Inter', sans-serif;

    --max-width: 1200px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth; /* Native smooth scrolling fallback */
}

body {
    font-family: var(--font-primary);
    color: var(--color-slate-medium);
    background-color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-slate-dark);
    font-weight: 700;
    line-height: 1.2;
}

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

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Reusable Button Style */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    background-color: var(--color-ice-blue);
    color: var(--color-white);
    font-weight: 600;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background-color: var(--color-ice-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.section-padding {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-ice-blue);
    margin: 1rem auto 0;
}

/* =========================================
   Header & Navigation
   ========================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    z-index: 1000;
    transition: var(--transition);
    /* Adding subtle border bottom initially, which changes on scroll */
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border-bottom: transparent;
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-accent {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-ice-blue);
    letter-spacing: 1px;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-slate-dark);
    display: none; /* Hidden on very small screens by default */
}

@media (min-width: 576px) {
    .logo-text {
        display: block;
    }
}

/* Navigation Menu */
.nav-list {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-slate-medium);
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-ice-blue);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-ice-blue);
}

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

.btn-nav {
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
}

.mobile-only {
    display: none;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle .bar {
    height: 3px;
    width: 100%;
    background-color: var(--color-slate-dark);
    border-radius: 3px;
    transition: var(--transition);
}

/* Responsive Nav */
@media (max-width: 992px) {
    .menu-toggle {
        display: flex;
    }

    .desktop-only {
        display: none;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--color-white);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease;
        padding: 2rem;
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 2rem;
        margin-bottom: 2rem;
        text-align: center;
    }

    .nav-link {
        font-size: 1.2rem;
    }

    .mobile-only {
        display: inline-block;
    }

    /* Menu Toggle Animation */
    .menu-toggle.active .bar:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    position: relative;
    padding-top: 140px; /* Account for fixed header */
    padding-bottom: 6rem;
    background-color: var(--color-bg-light);
    overflow: hidden;
    text-align: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0.8;
}

.turbine-svg {
    width: 120%;
    max-width: 1000px;
    height: auto;
    animation: spin-slow 40s linear infinite;
}

@keyframes spin-slow {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-headline {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    color: var(--color-slate-dark);
    max-width: 800px;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.hero-subheadline {
    font-size: 1.1rem;
    color: var(--color-slate-medium);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.btn-hero {
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
    margin-bottom: 4rem;
    border-radius: 6px;
}

.hero-video-wrapper {
    width: 100%;
    max-width: 1108px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
    background-color: var(--color-slate-dark);
    /* Maintain aspect ratio 1108:828 (~4:3) */
    aspect-ratio: 1108 / 828;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.service-card {
    background-color: var(--color-bg-light);
    padding: 3rem 2rem;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(15, 23, 42, 0.05);
    border-color: rgba(14, 165, 233, 0.2);
    background-color: var(--color-white);
}

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--color-ice-blue);
}

.service-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-desc {
    color: var(--color-slate-medium);
}

/* =========================================
   About Section
   ========================================= */
.about {
    background-color: var(--color-slate-dark);
    color: var(--color-white);
}

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

.about .section-title::after {
    margin: 1rem 0 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    align-items: center;
}

@media (min-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.about-text {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: #cbd5e1; /* slate-300 */
}

.about-features {
    margin-top: 2rem;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
}

.check-icon {
    width: 24px;
    height: 24px;
    color: var(--color-ice-blue);
    flex-shrink: 0;
}

.about-image img {
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* =========================================
   Contact Section
   ========================================= */
.contact {
    background-color: var(--color-bg-light);
}

.contact-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-white);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .form-group-row {
        grid-template-columns: 1fr 1fr;
    }
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-slate-dark);
}

.form-input {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--color-slate-dark);
    transition: var(--transition);
    background-color: #f8fafc;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-ice-blue);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
    background-color: var(--color-white);
}

.btn-submit {
    width: 100%;
    font-size: 1.1rem;
    padding: 1rem;
    margin-top: 1rem;
}

/* =========================================
   Footer
   ========================================= */
.footer {
    background-color: var(--color-slate-dark);
    color: #cbd5e1;
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

.footer-logo {
    margin-bottom: 1.5rem;
}

.footer-text {
    line-height: 1.8;
}

.footer-heading {
    color: var(--color-white);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-links a {
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-ice-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}