:root {
    --primary-color: #0078D4;
    --primary-light: #E5F1FB;
    --accent-color: #107C10;
    --surface: #FFFFFF;
    --surface-light: #FAFAFA;
    --surface-dark: #F3F3F3;
    --text-primary: #323130;
    --text-secondary: #605E5C;
    --border: #EDEBE9;
    --border-light: #F3F2F1;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

body {
    background-color: var(--surface-light);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Styles */
header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.logo-icon {
    margin-right: 8px;
    width: 32px;
    height: 32px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
    padding: 8px 0;
}

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

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

nav a:hover::after {
    width: 100%;
}

.language-selector select {
    padding: 8px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background-color: var(--surface);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--surface) 0%, var(--surface-light) 100%);
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(0, 120, 212, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 16px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color) 0%, #4CAF50 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 40px;
    color: var(--text-secondary);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 32px;
    border-radius: var(--radius-lg);
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.cta-button:hover {
    background-color: #106EBE;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.cta-button .material-icons {
    margin-right: 8px;
}

/* Features Section */
.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    font-size: 2.5rem;
    font-weight: 600;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    background-color: var(--surface);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 1px solid var(--border-light);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    background-color: var(--primary-light);
    color: var(--primary-color);
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon .material-icons {
    font-size: 2.25rem;
}

.feature-card h3 {
    margin-bottom: 16px;
    font-size: 1.5rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
}

/* Links Section */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.link-card {
    background-color: var(--surface);
    border-radius: var(--radius-xl);
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 1px solid var(--border-light);
}

.link-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.link-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.link-card h3 {
    margin-bottom: 8px;
    font-size: 1.25rem;
    font-weight: 600;
}

.link-card a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    display: block;
    margin-top: 8px;
    transition: color 0.2s;
}

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

/* Footer */
footer {
    background-color: var(--surface);
    color: var(--text-primary);
    padding: 60px 0 40px;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
}

.footer-logo-icon {
    margin-right: 8px;
    width: 32px;
    height: 32px;
}

.footer-about p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.footer-links h4, .footer-contact h4 {
    margin-bottom: 20px;
    font-size: 1.125rem;
    font-weight: 600;
}

.footer-links ul, .footer-contact ul {
    list-style: none;
}

.footer-links li, .footer-contact li {
    margin-bottom: 12px;
}

.footer-links a, .footer-contact a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.copyright {
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Modal Styles - Windows 11 Style */
.black_overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    z-index: 1001;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.black_overlay.show {
    opacity: 1;
}

.white_content {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 500px;
    background-color: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
    z-index: 1002;
    opacity: 0;
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    overflow: hidden;
}

.white_content.show {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background-color: var(--surface-dark);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.download-option {
    display: flex;
    align-items: center;
    padding: 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    transition: all 0.2s;
    border: 1px solid var(--border-light);
}

.download-option:hover {
    background-color: var(--surface-light);
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.option-icon {
    margin-right: 16px;
}

.option-icon img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    object-fit: contain;
}

.option-info {
    flex: 1;
}

.option-info h3 {
    margin: 0 0 6px 0;
    font-size: 1.125rem;
    font-weight: 600;
}

.option-info p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.option-button {
    display: inline-flex;
    align-items: center;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-weight: 500;
    text-decoration: none;
    transition: background-color 0.2s;
    white-space: nowrap;
}

.option-button:hover {
    background-color: #106EBE;
}

.option-button .material-icons {
    margin-right: 6px;
    font-size: 1.125rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 12px 0;
    }

    nav ul {
        display: none;
    }

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

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.125rem;
    }

    .section {
        padding: 80px 0;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .download-option {
        flex-direction: column;
        text-align: center;
        padding: 16px;
    }

    .option-icon {
        margin-right: 0;
        margin-bottom: 12px;
    }

    .option-info {
        margin-bottom: 12px;
    }

    .white_content {
        width: 95%;
    }
}