/* ===== Navigation ===== */
.main-navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background-color: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.main-navigation.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.logo-icon {
    font-size: 1.4rem;
}

.logo-image {
    height: 36px;
    width: auto;
    border-radius: 8px;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle-icon {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
}

.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { bottom: -6px; }

.nav-toggle.active .nav-toggle-icon { background-color: transparent; }
.nav-toggle.active .nav-toggle-icon::before { transform: rotate(45deg); top: 0; }
.nav-toggle.active .nav-toggle-icon::after { transform: rotate(-45deg); bottom: 0; }

/* ===== Hero ===== */
.hero {
    padding: calc(64px + var(--spacing-4xl)) 0 var(--spacing-3xl);
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -1.5px;
}

.hero-title .highlight {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 640px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

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

.hero-stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    display: block;
}

.hero-stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.hero-image {
    margin-top: var(--spacing-3xl);
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* ===== About / What is ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.about-text {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm) var(--spacing-lg);
}

.about-list li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.about-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.about-image {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ===== Features ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl) var(--spacing-lg);
}

.feature-item {
    text-align: left;
}

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== Download ===== */
.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.download-card {
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.download-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.download-card-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.download-card-req {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

/* ===== Footer ===== */
.footer-section {
    background-color: var(--color-primary);
    color: #ffffff;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    max-width: 300px;
}

.footer-section h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: #ffffff;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-md) var(--spacing-lg);
        flex-direction: column;
        gap: var(--spacing-sm);
    }

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

    .nav-toggle {
        display: block;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-stats {
        gap: var(--spacing-xl);
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-list {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .download-grid {
        grid-template-columns: 1fr;
    }

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