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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --background: #f8fafc;
    --foreground: #0f172a;
    --muted: #64748b;
    --card: #ffffff;
    --border: #e2e8f0;
    --success: #22c55e;
    --warning: #f59e0b;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--background);
    color: var(--foreground);
    min-height: 100vh;
    line-height: 1.6;
}

/* Header */
.header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--foreground);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.header-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.header-btn:hover {
    background: var(--primary-dark);
}

/* Hero Section */
.hero {
    padding: 4rem 1.5rem;
    text-align: center;
    background: linear-gradient(180deg, var(--card) 0%, var(--background) 100%);
}

.hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #dbeafe;
    color: var(--primary);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.125rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.2s;
    min-width: 280px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-outline {
    background: var(--card);
    color: var(--foreground);
    border: 2px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn i {
    font-size: 1.25rem;
}

/* App Preview */
.app-preview {
    margin-top: 3rem;
}

.app-preview img {
    max-width: 280px;
    border-radius: 24px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

/* Features Section */
.features {
    padding: 4rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.features h2 {
    text-align: center;
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.features-subtitle {
    text-align: center;
    color: var(--muted);
    margin-bottom: 2.5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: #dbeafe;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.feature-icon i {
    font-size: 1.25rem;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--muted);
    font-size: 0.9375rem;
}

/* Installation Guide */
.install-guide {
    padding: 4rem 1.5rem;
    background: var(--card);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.install-guide-content {
    max-width: 800px;
    margin: 0 auto;
}

.install-guide h2 {
    text-align: center;
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.install-guide-subtitle {
    text-align: center;
    color: var(--muted);
    margin-bottom: 2.5rem;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.step-content p {
    color: var(--muted);
    font-size: 0.9375rem;
}

.step-content code {
    background: #f1f5f9;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.warning-box {
    background: #fef3c7;
    border: 1px solid #f59e0b;
    border-radius: 12px;
    padding: 1rem 1.25rem;
    margin-top: 2rem;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.warning-box i {
    color: #d97706;
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.warning-box p {
    color: #92400e;
    font-size: 0.9375rem;
}

/* Footer */
.footer {
    padding: 2rem 1.5rem;
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer p {
    color: var(--muted);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

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

/* Responsive */
@media (min-width: 640px) {
    .hero h1 {
        font-size: 3rem;
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .btn {
        min-width: 100%;
    }
    
    .header-btn span {
        display: none;
    }
}