/* ============================================= */
/* CSS Variables */
/* ============================================= */
:root {
    /* Bright Color Palette */
    --color-primary: #00A896; /* Vibrant Teal */
    --color-primary-dark: #00877A;
    --color-secondary: #F0F3BD; /* Light Lime Green */
    --color-accent: #FF8C42; /* Bright Orange */
    --color-accent-dark: #E0742B;
    
    /* Neutral & Text Colors */
    --color-text: #212529; /* Dark Gray for high contrast */
    --color-text-light: #F8F9FA; /* Off-white */
    --color-background-light: #FFFFFF;
    --color-background-medium: #F8F9FA;
    --color-border: #DEE2E6;
    --color-footer-bg: #212529;
    
    /* Font Families */
    --font-heading: 'Archivo Black', sans-serif;
    --font-body: 'Roboto', sans-serif;
    
    /* Spacing & Sizes */
    --header-height: 80px;
    --spacing-xs: 0.5rem;   /* 8px */
    --spacing-sm: 1rem;     /* 16px */
    --spacing-md: 1.5rem;   /* 24px */
    --spacing-lg: 3rem;     /* 48px */
    --spacing-xl: 5rem;     /* 80px */
    --container-width: 1200px;
    --border-radius: 8px;

    /* Transitions & Animations */
    --transition-speed-fast: 0.2s;
    --transition-speed-normal: 0.4s;
    --transition-elastic: cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

/* ============================================= */
/* Global Styles & Reset */
/* ============================================= */
*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-background-light);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ============================================= */
/* Typography */
/* ============================================= */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--color-text);
    text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    max-width: 75ch;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-speed-fast) ease-in-out;
}

a:hover, a:focus {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

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

.section {
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
}

.section--light-bg {
    background-color: var(--color-background-medium);
}

.section__title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section__subtitle {
    text-align: center;
    margin: -2rem auto 3rem;
    font-size: 1.1rem;
    color: #6c757d;
}

.columns {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    align-items: center;
}

.column {
    flex: 1;
    min-width: 300px;
}

.column.is-two-thirds {
    flex-basis: 66.66%;
}

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

/* ============================================= */
/* Global Button Styles */
/* ============================================= */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-speed-normal) var(--transition-elastic);
    transform-origin: center;
}

.btn:hover, .btn:focus {
    transform: scale(1.05) translateY(-3px);
    text-decoration: none;
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

.btn:active {
    transform: scale(0.98) translateY(0);
}

.btn--primary {
    background-color: var(--color-accent);
    color: var(--color-text-light);
    border-color: var(--color-accent);
}

.btn--primary:hover, .btn--primary:focus {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: var(--color-text-light);
}

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

.btn--secondary:hover, .btn--secondary:focus {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

/* ============================================= */
/* Header */
/* ============================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: background-color var(--transition-speed-fast) ease;
}

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

.header__logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--color-text);
    text-decoration: none;
}
.header__logo:hover {
    color: var(--color-primary);
}

.header__nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-md);
}

.header__nav-link {
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    position: relative;
    padding: var(--spacing-xs) 0;
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-speed-normal) var(--transition-elastic);
}

.header__nav-link:hover::after,
.header__nav-link:focus::after {
    transform: scaleX(1);
    transform-origin: left;
}

.header__burger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.header__burger-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-text);
    margin: 5px 0;
    transition: all 0.3s ease-in-out;
}

/* ============================================= */
/* Hero Section */
/* ============================================= */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    color: var(--color-text-light);
    text-align: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed; /* Parallax effect */
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5));
}

.hero__container {
    position: relative;
    z-index: 1;
}

.hero__content {
    max-width: 800px;
    margin: 0 auto;
}

.hero__title {
    color: var(--color-text-light);
    font-size: 4rem;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
}

.hero__subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

/* ============================================= */
/* Cards & Sliders (Case Studies, Sustainability) */
/* ============================================= */
.slider {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 80%;
    gap: var(--spacing-md);
    overflow-x: auto;
    padding: var(--spacing-md);
    scroll-snap-type: x mandatory;
}

@media (min-width: 768px) {
    .slider {
        grid-auto-columns: 45%;
    }
}
@media (min-width: 1024px) {
    .slider {
        grid-auto-columns: 31%;
    }
}


.card {
    background: var(--color-background-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform var(--transition-speed-normal) var(--transition-elastic), box-shadow var(--transition-speed-normal) ease;
    display: flex;
    flex-direction: column;
    scroll-snap-align: start;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

.card-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: var(--spacing-md);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

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

.card__text {
    flex-grow: 1;
    margin-bottom: var(--spacing-md);
}

.card__author {
    font-style: italic;
    color: #6c757d;
    margin-top: auto;
}

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

.info-card {
    text-align: center;
    background: var(--color-background-light);
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform var(--transition-speed-normal) var(--transition-elastic), box-shadow var(--transition-speed-normal) ease;
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.1);
}

.info-card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.info-card__title {
    margin-bottom: var(--spacing-sm);
}

/* ============================================= */
/* External Resources Section */
/* ============================================= */
.external-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.external-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--color-border);
    border-radius: 50px;
    color: var(--color-text);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-speed-normal) var(--transition-elastic);
}

.external-link:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    transform: scale(1.05);
    color: var(--color-text);
}

/* ============================================= */
/* FAQ Section */
/* ============================================= */
.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid var(--color-border);
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: var(--spacing-md) 0;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text);
}

.faq-question::after {
    content: '+';
    font-size: 2rem;
    font-weight: 300;
    color: var(--color-primary);
    transition: transform var(--transition-speed-normal) var(--transition-elastic);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94), padding 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.faq-answer p {
    padding-bottom: var(--spacing-md);
    margin: 0;
}

/* ============================================= */
/* Contact Form */
/* ============================================= */
.contact-form {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    position: relative;
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-background-light);
    font-size: 1rem;
    color: var(--color-text);
    transition: border-color var(--transition-speed-fast) ease-in-out;
}

textarea.form-input {
    resize: vertical;
    min-height: 150px;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 168, 150, 0.2);
}

.form-label {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    color: #6c757d;
    background-color: var(--color-background-light);
    padding: 0 5px;
    transition: all var(--transition-speed-fast) ease-in-out;
    pointer-events: none;
}

.form-input:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label {
    top: -12px;
    font-size: 0.8rem;
    color: var(--color-primary);
}

/* ============================================= */
/* Footer */
/* ============================================= */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-text-light);
    padding-top: var(--spacing-xl);
}

.footer__container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer__title {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

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

.footer__list li {
    margin-bottom: var(--spacing-xs);
}

.footer__link {
    color: #adb5bd;
    text-decoration: none;
    transition: color var(--transition-speed-fast) ease;
}

.footer__link:hover {
    color: var(--color-text-light);
    text-decoration: underline;
}

.footer__bottom {
    border-top: 1px solid #495057;
    padding: var(--spacing-md) 0;
    text-align: center;
    color: #6c757d;
}

/* ============================================= */
/* Animation on Scroll */
/* ============================================= */
[data-animate-on-scroll] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-animate-on-scroll].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================= */
/* Specific Page Styles */
/* ============================================= */
.page-content,
.success-page {
    padding-top: calc(var(--header-height) + var(--spacing-xl));
    padding-bottom: var(--spacing-xl);
}

.success-page {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}

.success-page h1 {
    color: var(--color-primary);
}

/* ============================================= */
/* Responsive Styles */
/* ============================================= */
@media (max-width: 1024px) {
    h1 { font-size: 3rem; }
    .hero__title { font-size: 3.2rem; }
    h2 { font-size: 2.2rem; }
}

@media (max-width: 768px) {
    .header__nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--color-background-light);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        display: flex;
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease-in-out;
    }

    .header__nav.is-active {
        right: 0;
    }

    .header__nav-list {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-lg);
    }
    
    .header__nav-link {
        font-size: 1.5rem;
    }

    .header__burger-btn {
        display: block;
    }

    .header__burger-btn.is-active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .header__burger-btn.is-active span:nth-child(2) {
        opacity: 0;
    }
    .header__burger-btn.is-active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero__title { font-size: 2.5rem; }
    .hero__subtitle { font-size: 1.1rem; }
}