:root {
    --primary-color: #000080; /* Navy */
    --secondary-color: #007bff;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --gray-light: #e9ecef;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

ul {
    list-style: none;
}

/* Header & Nav */
header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 82px;
}

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

.logo svg {
    height: 40px;
    width: 40px;
    margin-right: 10px;
}

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

.nav-links a {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
    line-height: 1;
    transition: var(--transition);
}

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

.btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--secondary-color);
    color: var(--white);
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

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

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--white) 0%, var(--bg-color) 100%);
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.hero p {
    font-size: 1.2rem;
    color: #666;
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-image {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 10px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    overflow: hidden;
    background-color: #ddd; /* Placeholder color */
    min-height: 400px; /* Placeholder height */
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
}

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

/* Features Section */
.features {
    padding: 80px 0;
    background-color: var(--white);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 30px;
    border-radius: 10px;
    background-color: var(--bg-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* Detailed Info Section */
.details {
    padding: 80px 0;
}

.detail-row {
    display: flex;
    align-items: center;
    gap: 50px;
    margin-bottom: 80px;
}

.detail-row:nth-child(even) {
    flex-direction: row-reverse;
}

.detail-content {
    flex: 1;
}

.detail-content h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.detail-image {
    flex: 1;
    background-color: #ddd;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
}
.detail-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
}

/* Reviews */
.reviews {
    padding: 80px 0;
    background-color: var(--primary-color);
    color: var(--white);
}

.reviews .section-title h2 {
    color: var(--white);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.review-card {
    background-color: rgba(255,255,255,0.1);
    padding: 30px;
    border-radius: 10px;
}

.stars {
    color: #ffc107;
    margin-bottom: 15px;
}

.review-author {
    margin-top: 20px;
    font-weight: bold;
    font-style: italic;
}

/* Download Page */
.download-section {
    padding: 100px 0;
    text-align: center;
    min-height: 60vh;
}

.download-card {
    background: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.version-info {
    margin: 20px 0;
    color: #666;
}

.requirements {
    margin-top: 40px;
    text-align: left;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-warning-image {
    display: block;
    width: min(100%, 320px);
    max-width: 100%;
    height: auto;
    object-fit: contain;
}

/* Contact Page */
.contact-section {
    padding: 100px 0;
    min-height: 60vh;
}

.contact-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
}

.contact-email {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin: 20px 0;
    font-weight: bold;
    word-break: break-all;
}

/* Footer */
footer {
    background-color: #222;
    color: #aaa;
    padding: 40px 0;
    text-align: center;
}

footer p {
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 82px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
        text-align: center;
    }

    .nav-links.active {
        display: flex;
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .requirements {
        overflow: hidden;
    }

    .download-warning-image {
        width: min(100%, 260px);
    }

    .detail-row, .detail-row:nth-child(even) {
        flex-direction: column;
    }
}