:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --max-width: 1100px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.025em;
}

.logo span {
    color: var(--text-color);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

.hero {
    padding: 5rem 0;
    text-align: center;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.05em;
    line-height: 1.1;
}

h1 span, h2 span {
    color: var(--primary-color);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 3rem;
}

.generator-box {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    margin: 0 auto;
}

.input-group {
    text-align: left;
    margin-bottom: 2rem;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

input[type="text"] {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.qr-container {
    background: #f1f5f9;
    border-radius: 0.5rem;
    width: 250px;
    height: 250px;
    margin: 0 auto 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border-color);
    overflow: hidden;
}

.qr-container img, .qr-container canvas {
    max-width: 100%;
    height: auto;
}

.qr-container .placeholder {
    color: var(--text-light);
    font-size: 0.875rem;
    padding: 2rem;
}

.actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-size: 1rem;
}

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

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

.btn.secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn.secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn.outline:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

.pricing {
    padding: 5rem 0;
    background: #f1f5f9;
}

.pricing h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 4rem;
}

.pricing-cards {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.card {
    background: var(--card-bg);
    padding: 3rem 2rem;
    border-radius: 1rem;
    width: 100%;
    max-width: 350px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    position: relative;
}

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

.badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-weight: 700;
    text-transform: uppercase;
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.price {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
}

.price span {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 400;
}

.card ul {
    list-style: none;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.card li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
}

.card li::before {
    content: "✓";
    color: #10b981;
    margin-right: 0.75rem;
    font-weight: 900;
}

footer {
    padding: 3rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    .hero { padding: 3rem 0; }
    .card.premium { transform: none; }
    .pricing-cards { flex-direction: column; align-items: center; }
}