:root {
    --primary-color: #5a69e0;
    --primary-hover: #4a59d0;
    --bg-dark: #f5f7fa;
    --bg-container: #ffffff;
    --text-primary: #1a1d2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Arial, Helvetica, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}


/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 60px;
    padding: 40px 0;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: 0 8px 24px rgba(90, 105, 224, 0.2);
    transition: transform 0.3s ease;
}

.app-icon:hover {
    transform: scale(1.05);
}

.hero h1 {
    font-size: 36px;
    margin: 0;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-color), #6c7cff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 18px;
    margin: 0;
}

/* Features Section */
.features-section {
    background: var(--bg-container);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
    border: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-top: 20px;
}

.features-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.features-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.features-list ul li {
    padding: 12px 0;
    font-size: 16px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.features-list ul li:last-child {
    border-bottom: none;
}

/* System Badges */
.systems-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
    justify-content: center;
}

.system-badge {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), #6c7cff);
    color: white;
    border-radius: 8px;
    font-weight: bold;
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(90, 105, 224, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.system-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(90, 105, 224, 0.3);
}

/* Screenshots Gallery */
.screenshots-section {
    margin-bottom: 40px;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.screenshot-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.screenshot-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

.screenshot-item:hover img {
    transform: scale(1.05);
}

/* Download CTA Section */
.download-cta {
    text-align: center;
    background: linear-gradient(135deg, rgba(90, 105, 224, 0.05), rgba(108, 124, 255, 0.05));
    padding: 60px 40px;
    border-radius: 16px;
    margin: 60px 0 40px 0;
    border: 1px solid var(--border-color);
}

.download-cta h2 {
    font-size: 32px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.download-cta p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

/* Navigation */
.nav {
    background: var(--bg-container);
    padding: 15px 0;
    margin-bottom: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Content Sections */
.section {
    margin-bottom: 32px;
}

.section h2 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.content-box {
    background: var(--bg-container);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.content-box h1 {
    color: var(--primary-color);
    font-size: 28px;
    margin-bottom: 20px;
    text-align: center;
}

.content-box h2 {
    color: var(--primary-color);
    font-size: 20px;
    margin-top: 30px;
    margin-bottom: 15px;
}

.content-box p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

/* Lists */
ul {
    padding-left: 20px;
}

ul li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

/* Notice Box */
.notice {
    background-color: rgba(255, 153, 0, 0.08);
    border-left: 4px solid #ff9900;
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 4px;
    color: var(--text-primary);
}

.notice strong {
    color: #ff9900;
}

/* Download Button */
.download {
    text-align: center;
    margin-top: 40px;
}

.download a {
    display: inline-block;
    padding: 0;
    background: transparent;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    transition: transform 0.2s ease, opacity 0.3s ease;
}

.download a img {
    height: 60px;
    width: auto;
    display: block;
    transition: transform 0.2s ease;
}

.download a:hover {
    transform: translateY(-3px);
    opacity: 0.9;
}

.download a:hover img {
    transform: scale(1.05);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-muted);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 600px) {
    .container {
        padding: 20px 15px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero-description {
        font-size: 16px;
    }

    .app-icon {
        width: 100px;
        height: 100px;
    }

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

    .features-section {
        padding: 30px 20px;
    }

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

    .download-cta {
        padding: 40px 20px;
    }

    .download-cta h2 {
        font-size: 24px;
    }

    .download-cta p {
        font-size: 16px;
    }

    .content-box {
        padding: 20px;
    }

    .content-box h1 {
        font-size: 22px;
    }

    .content-box h2 {
        font-size: 18px;
    }

    .nav ul {
        gap: 15px;
    }

    .system-badge {
        padding: 10px 20px;
        font-size: 13px;
    }
}