/* Reset and Base Styles */
:root {
    --primary-color: #0078d4;
    --secondary-color: #2b88d8;
    --accent-color: #004578;
    --text-color: #323130;
    --light-bg: #f3f2f1;
    --white: #ffffff;
    --dark-bg: #201f1e;
    --success-color: #107c10;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

ul {
    list-style: none;
}

/* Header & Navigation */
header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-links a {
    font-weight: 500;
    transition: color 0.3s;
}

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

.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-btn {
    border: 1px solid #c8c6c4;
    background-color: var(--white);
    color: var(--text-color);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    font-size: 0.85rem;
}

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

.cta-button {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: var(--accent-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--light-bg) 0%, #e1dfdd 100%);
    padding: 4rem 2rem;
    text-align: center;
}

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

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: #605e5c;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    font-weight: 600;
    transition: all 0.3s;
}

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

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

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

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

/* Features Highlights (Home) */
.highlights {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.highlights h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
}

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

.highlight-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s;
}

.highlight-card:hover {
    transform: translateY(-5px);
}

.highlight-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.highlight-card h3 {
    margin-bottom: 1rem;
}

/* Detailed Features Page */
.features-section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-block {
    display: flex;
    align-items: center;
    margin-bottom: 4rem;
    gap: 4rem;
}

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

.feature-text {
    flex: 1;
}

.feature-text h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-text ul {
    list-style: disc;
    padding-left: 1.5rem;
    margin-top: 1rem;
}

.feature-text li {
    margin-bottom: 0.5rem;
}

.feature-visual {
    flex: 1;
    background-color: var(--light-bg);
    height: 300px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #a19f9d;
    font-size: 1.5rem;
    border: 2px dashed #c8c6c4;
}

/* Download Page */
.download-section {
    padding: 4rem 2rem;
    text-align: center;
    background-color: var(--light-bg);
}

.download-card {
    background: var(--white);
    max-width: 600px;
    margin: 0 auto;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.download-card h1 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.version-info {
    margin-bottom: 2rem;
    color: #605e5c;
}

.system-req {
    text-align: left;
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: #faf9f8;
    border-radius: 4px;
}

.system-req h3 {
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 2rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: #c8c6c4;
    margin: 0 1rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Simplification for this demo */
    }
    
    .feature-block {
        flex-direction: column;
        gap: 2rem;
    }
    
    .feature-block:nth-child(even) {
        flex-direction: column;
    }
}