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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    color: white;
    text-align: center;
    padding: 60px 20px;
}

header i {
    font-size: 3rem;
    margin-bottom: 15px;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.tagline {
    font-size: 1.2rem;
    margin-bottom: 20px;
    opacity: 0.9;
}

.badges {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.badge {
    background: rgba(255,255,255,0.2);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.badge i {
    font-size: 0.8rem;
    margin-right: 5px;
}

/* Navigation */
nav {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav .container {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    padding: 15px 20px;
}

nav a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s;
}

nav a i {
    margin-right: 5px;
}

nav a:hover {
    color: #0d6efd;
}

/* Main content */
main {
    padding: 40px 0;
}

section {
    background: white;
    border-radius: 12px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #0d6efd;
    border-bottom: 3px solid #0d6efd;
    display: inline-block;
    padding-bottom: 5px;
}

section h2 i {
    margin-right: 10px;
}

/* Features grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.feature-card {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.feature-card i {
    color: #0d6efd;
    margin-bottom: 15px;
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.2rem;
}

.feature-card p {
    color: #666;
    font-size: 0.9rem;
}

/* Download grid */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.download-card {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
}

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

.download-card i {
    color: #0d6efd;
    margin-bottom: 15px;
}

.download-card h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.download-card p {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.download-links {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #0d6efd;
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    transition: background 0.3s;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn:hover {
    background: #0a58ca;
}

.github-btn {
    background: #24292e;
}

.github-btn:hover {
    background: #1a1e22;
}

.drive-btn {
    background: #0f9d58;
}

.drive-btn:hover {
    background: #0b7e48;
}

.btn.disabled {
    background: #adb5bd;
    cursor: not-allowed;
    opacity: 0.7;
}

.small-note {
    margin-top: 15px;
    font-size: 0.8rem;
}

.small-note a {
    color: #0d6efd;
    text-decoration: none;
}

.mirror-note {
    background: #e7f3ff;
    padding: 10px 15px;
    border-radius: 8px;
    text-align: center;
    font-size: 0.9rem;
    margin-top: 20px;
}

.mirror-note i {
    color: #0d6efd;
    margin-right: 5px;
}

/* Screenshots */
.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.screenshot-card {
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
    text-align: center;
}

.screenshot-placeholder {
    background: #e9ecef;
    padding: 40px 20px;
    text-align: center;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

.screenshot-placeholder i {
    color: #adb5bd;
}

.screenshot-placeholder p {
    color: #6c757d;
    font-size: 0.9rem;
}

/* Guide steps */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.step {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: #0d6efd;
    color: white;
    border-radius: 50%;
    line-height: 40px;
    font-weight: bold;
    margin-bottom: 15px;
}

.step i {
    font-size: 1.5rem;
    color: #0d6efd;
    margin: 10px 0;
    display: block;
}

.step p {
    font-size: 0.9rem;
}

.tip {
    background: #e7f3ff;
    border-left: 4px solid #0d6efd;
    padding: 15px 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.tip i {
    color: #0d6efd;
    margin-right: 8px;
}

code {
    background: #e9ecef;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.85rem;
}

.note {
    text-align: center;
    margin-top: 20px;
    color: #666;
}

.note i {
    margin-right: 5px;
}

/* Footer */
footer {
    background: #212529;
    color: #adb5bd;
    text-align: center;
    padding: 30px 0;
    font-size: 0.9rem;
}

footer p {
    margin: 5px 0;
}

footer i {
    margin: 0 3px;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    section {
        padding: 25px;
    }
    
    section h2 {
        font-size: 1.5rem;
    }
    
    nav .container {
        gap: 15px;
    }
    
    nav a {
        font-size: 0.85rem;
    }
    
    .download-card h3 {
        font-size: 1.2rem;
    }
}

.logo {
    width: 80px;
    height: 80px;
    margin-bottom: 15px;
}

@media (max-width: 768px) {
    .logo {
        width: 60px;
        height: 60px;
    }
}