:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --bg-body: #ffffff;
    --bg-alt: #f1f5f9;
    --border: #e2e8f0;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-body);
    line-height: 1.6;
}

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

/* Navbar */
.navbar {
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

.logo img {
    height: 32px;
    width: 32px;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: color 0.2s;
}

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

.admin-link {
    background: var(--bg-alt);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 80px 24px;
    gap: 48px;
    min-height: 70vh;
}

.hero-text {
    flex: 1;
    max-width: 600px;
}

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #0f172a 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.39);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.23);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
    border-radius: var(--radius-md);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.mockup-card {
    width: 100%;
    max-width: 400px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

.mockup-header {
    background: var(--bg-alt);
    padding: 12px 16px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.mockup-body {
    padding: 24px;
}

.mockup-body h3 {
    margin-bottom: 16px;
    color: var(--primary);
}

.mockup-body p {
    color: var(--text-muted);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.progress-bar {
    height: 8px;
    background: var(--bg-alt);
    border-radius: 4px;
    margin-top: 24px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    width: 60%;
    animation: load 2s ease-in-out infinite alternate;
}

@keyframes load {
    0% { width: 30%; }
    100% { width: 90%; }
}

/* Sections */
.bg-light {
    background: var(--bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* Features Section */
.features-section {
    padding: 80px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 1100px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-icon {
    font-size: 1.75rem;
    width: 48px;
    height: 48px;
    background: var(--bg-alt);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.55;
}

/* Pricing Section */
.pricing-section {
    padding: 80px 0;
}

.pricing-footnote {
    margin-top: 40px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.pricing-footnote strong {
    color: var(--text-main);
}

.pricing-cards {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.pricing-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 100%;
    max-width: 340px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    position: relative;
    transition: transform 0.2s;
}

.pricing-card:hover {
    transform: translateY(-8px);
}

.pricing-card.featured {
    border: 2px solid var(--primary);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 8px;
}

.plan-desc {
    color: var(--text-muted);
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.features-list {
    list-style: none;
    margin-bottom: 32px;
}

.features-list li {
    margin-bottom: 12px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Payment & Contact Section */
.payment-contact-section {
    padding: 80px 0;
}

.split-layout {
    display: flex;
    gap: 64px;
    align-items: flex-start;
}

.payment-info {
    flex: 3;
}

.payment-info h2 {
    font-size: 2rem;
    margin-bottom: 24px;
}

.buy-steps {
    padding-left: 20px;
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.buy-steps li {
    margin-bottom: 12px;
    color: var(--text-muted);
}

.qr-container {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.qr-card {
    background: var(--bg-alt);
    padding: 24px;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border);
}

.qr-card h4 {
    margin-bottom: 16px;
    color: var(--text-main);
}

.qr-wrapper img {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    margin-bottom: 16px;
    background: white;
    padding: 8px;
    border: 1px solid var(--border);
}

.support-info {
    flex: 2;
    background: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.support-info h2 {
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.support-info p {
    color: var(--text-muted);
    margin-bottom: 32px;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 16px;
    text-decoration: none;
    color: var(--text-main);
}

.contact-icon {
    font-size: 2rem;
    background: var(--bg-alt);
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.contact-details {
    display: flex;
    flex-direction: column;
}

.contact-details strong {
    font-size: 1.1rem;
}

.contact-details span {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: var(--bg-alt);
    padding: 48px 0 24px;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    color: var(--text-main);
}

.footer-brand img {
    height: 32px;
    width: 32px;
    filter: grayscale(100%);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}

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

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

/* Responsive */
@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 40px 24px;
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .split-layout {
        flex-direction: column;
    }
    
    .pricing-card.featured {
        transform: scale(1);
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
}