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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    background: #fff;
    padding: 10px 0;
    border-bottom: 1px solid #e0e0e0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: #666;
    font-size: 0.95rem;
    transition: color 0.2s;
}

nav a:hover {
    color: #2196F3;
}

/* Main Content */
main {
    flex: 1;
    padding: 80px 30px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-text {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: #333;
    line-height: 1.2;
}

.tagline {
    font-size: 1.2rem;
    color: #666;
    line-height: 1.6;
}

.features {
    list-style: none;
}

.features li {
    padding: 5px 0;
    color: #555;
    font-size: 1rem;
    line-height: 1.8;
}

.download-section {
    margin-top: 20px;
}

.download-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-block;
    padding: 14px 28px;
    background: #2196F3;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.download-btn:hover {
    background: #1976D2;
    transform: translateY(-2px);
}

.download-btn.secondary {
    background: #fff;
    color: #2196F3;
    border: 2px solid #2196F3;
}

.download-btn.secondary:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
}

.version-info {
    margin-top: 15px;
    color: #999;
    font-size: 0.9rem;
}

.update-info {
    display: inline-block;
    margin-top: 8px;
    padding: 6px 12px;
    background: #e3f2fd;
    color: #1976D2;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 20px;
}

.system-requirement {
    margin-top: 12px;
    color: #999;
    font-size: 0.85rem;
    line-height: 1.6;
}

.system-requirement a {
    color: #999;
    text-decoration: underline;
}

.system-requirement a:hover {
    color: #666;
}

.feedback-link {
    margin-top: 15px;
    color: #666;
    font-size: 0.9rem;
    line-height: 1.6;
}

.feedback-link a {
    color: #2196F3;
    text-decoration: none;
    font-weight: 500;
}

.feedback-link a:hover {
    text-decoration: underline;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.screenshot {
    max-width: 100%;
    height: auto;
    border: 1px solid #e0e0e0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.screenshot:hover {
    transform: scale(1.02);
}

/* Footer */
footer {
    background: #fff;
    padding: 40px 0;
    border-top: 1px solid #e0e0e0;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.footer-section p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #666;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: #2196F3;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
    color: #999;
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    h1 {
        font-size: 2.5rem;
    }

    .hero-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    nav {
        display: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    h1 {
        font-size: 2rem;
    }

    main {
        padding: 50px 20px;
    }

    .download-buttons {
        flex-direction: column;
    }

    .download-btn {
        text-align: center;
    }
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.75rem;
    }

    .header-container {
        padding: 0 20px;
    }

    .footer-container {
        padding: 0 20px;
    }
}