:root {
    --primary: #2563eb;
    --bg: #f5f7fb;
}

body {
    background: var(--bg);
    color: #1e293b;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.navbar {
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
}

.brand {
    font-size: 1.35rem;
    font-weight: 750;
    color: var(--primary);
    text-decoration: none;
}

.hero {
    padding: 42px 0 28px;
    text-align: center;
}

.hero h1 {
    font-weight: 750;
    letter-spacing: -1px;
}

.main-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 16px;
    padding: 26px;
    height: 100%;
    box-shadow: 0 5px 20px rgba(15, 23, 42, .035);
}

.form-label {
    font-weight: 650;
}

#qrCanvas {
    max-width: 100%;
    height: auto;
}

#qrPreview {
    min-height: 280px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
}

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

.feature {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 20px;
    height: 100%;
}

footer {
    border-top: 1px solid #e5e7eb;
    background: white;
}

#qrOutput img{
    width: 100%;
}

@media (max-width: 767px) {
    .hero {
        padding-top: 30px;
    }

    .main-card {
        padding: 18px;
    }
}