:root {
    /* Color Palette */
    --color-primary: #00A896;
    --color-primary-dark: #008f80;
    /* Darker shade for hover */
    --color-secondary: #333333;
    --color-white: #FFFFFF;
    --color-accent: #94D2BD;
    --color-bg-light: #f9f9f9;
    --color-text-body: #555555;

    /* Typography */
    --font-heading: 'Roboto', sans-serif;
    --font-body: 'Open Sans', sans-serif;

    /* Spacing & Layout */
    --container-width: 1200px;
    --header-height: 80px;
    --section-spacing: 5rem;
    --border-radius: 8px;

    /* Transitions */
    --transition-fast: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text-body);
    line-height: 1.6;
    background-color: var(--color-white);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--color-secondary);
    line-height: 1.2;
    margin-bottom: 1rem;
}

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

ul {
    list-style: none;
}

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

/* Utility Classes */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-align: center;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

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

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: all var(--transition-fast);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-weight: 600;
    color: var(--color-secondary);
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    background-image: url('../img/hero-banner.png');
    background-size: cover;
    background-position: center;
    color: var(--color-white);
    margin-top: 0;
    /* Override if needed */
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.6));
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding-top: var(--header-height);
}

.hero-title {
    font-size: 4rem;
    color: var(--color-white);
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: 2rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-text-intro {
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 600px;
    background: rgba(0, 0, 0, 0.5);
    /* Semi-transparent box for readability */
    padding: 1.5rem;
    border-left: 4px solid var(--color-accent);
    backdrop-filter: blur(5px);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* Section Styles */
.section {
    padding: var(--section-spacing) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--color-secondary);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-body);
}

/* Expertise Section */
.expertise {
    background-color: var(--color-bg-light);
}

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

.expertise-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.expertise-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-image {
    height: 200px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.expertise-card:hover .card-image img {
    transform: scale(1.1);
}

.card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h3 {
    color: var(--color-primary);
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.card-content p {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--color-text-body);
}

.card-tech {
    margin-top: auto;
    font-size: 0.85rem;
    color: var(--color-secondary);
    background: rgba(148, 210, 189, 0.15);
    /* Accent color with low opacity */
    padding: 0.5rem;
    border-radius: 4px;
}

/* Technology Section */
.technology {
    background-color: var(--color-white);
}

.tech-container {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.tech-feature {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.tech-feature.reverse {
    flex-direction: row-reverse;
}

.tech-content {
    flex: 1;
}

.tech-content h3 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.tech-content p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.tech-list {
    list-style: disc;
    padding-left: 1.5rem;
    color: var(--color-text-body);
}

.tech-list li {
    margin-bottom: 0.5rem;
}

.tech-image {
    flex: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.tech-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Projects Section */
.projects {
    background-color: var(--color-bg-light);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    height: 300px;
}

.project-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-item:hover img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    padding: 2rem 1.5rem 1rem;
    color: var(--color-white);
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.3s ease;
}

.project-item:hover .project-overlay {
    transform: translateY(0);
    opacity: 1;
}

.project-overlay h3 {
    font-size: 1.3rem;
    color: var(--color-white);
    /* Ensure white text */
    margin-bottom: 0.25rem;
}

.project-overlay p {
    font-size: 0.9rem;
    color: var(--color-accent);
}

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

.contact-container {
    display: flex;
    gap: 4rem;
    align-items: flex-start;
}

.contact-info {
    flex: 1;
}

.contact-info h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-secondary);
}

.contact-info p {
    margin-bottom: 2rem;
    color: var(--color-text-body);
}

.info-item {
    margin-bottom: 2rem;
}

.info-item h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.contact-form-wrapper {
    flex: 1;
    background-color: var(--color-bg-light);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

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

.btn-block {
    width: 100%;
}

/* Footer */
.footer {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.footer h4 {
    color: var(--color-white);
    margin-bottom: 1rem;
}

.footer-links a {
    color: #ccc;
    display: block;
    margin-bottom: 0.5rem;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: #999;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--color-white);
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
        z-index: 999;
        display: flex;
        /* Override display: none if handled by JS */
    }

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

    .nav-list {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .tech-feature,
    .tech-feature.reverse {
        flex-direction: column;
        gap: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .contact-container {
        flex-direction: column;
        gap: 3rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* Scroll Reveal Animation */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}