/* Changan Auto - Automation In Harmony with Nature */
/* Variables */
:root {
    --primary-color: #006D5B;
    /* Forest Green */
    --secondary-color: #F4F1DE;
    /* Light Beige */
    --accent-color: #70e000;
    /* Bright Mint Green */
    --text-color: #333333;
    --text-light: #F4F1DE;
    --white: #FFFFFF;
    --black: #1a1a1a;
    --font-main: 'Inter', sans-serif;
    --transition-speed: 0.3s;
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
    border-radius: 8px;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    border: none;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    background-color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(0, 109, 91, 0.95);
    /* Primary with opacity */
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo span {
    color: var(--accent-color);
    margin-left: 5px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links li a {
    color: var(--text-light);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--accent-color);
}

.cta-btn {
    background-color: var(--accent-color);
    color: var(--primary-color);
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: 700;
}

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

/* Mobile Toggle */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--white);
    cursor: pointer;
}

/* Sections General */
section {
    padding: 80px 5%;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header p {
    font-size: 1.1rem;
    color: #555;
}

/* Hero Section */
#home {
    height: 100vh;
    display: flex;
    align-items: center;
    color: var(--white);
    position: relative;
    padding-top: var(--header-height);
    /* Fallback/Placeholder background if image fails */
    background: linear-gradient(rgba(0, 109, 91, 0.7), rgba(0, 109, 91, 0.5)), url('../assets/images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* Areas of Expertise */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition-speed);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.card-img {
    height: 200px;
    width: 100%;
    object-fit: cover;
}

.card-content {
    padding: 25px;
}

.card-content h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.tech-tag {
    display: block;
    margin-top: 15px;
    font-size: 0.85rem;
    color: #666;
    font-style: italic;
    background: #f0f0f0;
    padding: 5px 10px;
    border-radius: 4px;
    width: fit-content;
}

/* Sustainable Technology */
#technology {
    background-color: var(--white);
}

.tech-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature {
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.feature-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 20px;
}

.feature h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* Projects */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.project-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    height: 300px;
}

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

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

.project-overlay {
    position: absolute;
    bottom: -100%;
    left: 0;
    width: 100%;
    padding: 20px;
    background: linear-gradient(to top, rgba(0, 109, 91, 0.9), transparent);
    color: var(--white);
    transition: 0.3s;
}

.project-item:hover .project-overlay {
    bottom: 0;
}

/* Contact */
#contact {
    background-color: var(--primary-color);
    color: var(--white);
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h3 {
    color: var(--accent-color);
    margin-bottom: 20px;
}

.contact-info p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cyber-form {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: 12px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--white);
    font-family: var(--font-main);
}

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

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

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.8);
}

.form-group select option {
    background-color: var(--primary-color);
    color: var(--white);
}

.submit-btn {
    width: 100%;
    background-color: var(--accent-color);
    color: var(--primary-color);
    font-weight: 700;
    padding: 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-transform: uppercase;
    transition: 0.3s;
}

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

/* Footer */
footer {
    background-color: #004d40;
    color: rgba(255, 255, 255, 0.7);
    padding: 40px 5% 20px;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.footer-logo span {
    color: var(--accent-color);
}

.copy {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 900px) {
    h1 {
        font-size: 2.5rem;
    }

    .menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--primary-color);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.3s;
    }

    .nav-links.active {
        right: 0;
    }

    .contact-container {
        grid-template-columns: 1fr;
    }

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