:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
    --error: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 450px;
    width: 100%;
}

.card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.product-image {
    width: 100%;
    height: 200px;
    border-radius: 15px;
    object-fit: cover;
    margin-bottom: 20px;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

p.description {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 25px;
    line-height: 1.5;
}

.price-tag {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 25px;
}

.price-tag span {
    font-size: 1rem;
    color: var(--text-muted);
}

.checkout-btn {
    display: inline-block;
    width: 100%;
    background: var(--primary);
    color: white;
    padding: 15px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.checkout-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.status-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.status-success { color: var(--success); }
.status-error { color: var(--error); }

.back-btn {
    margin-top: 20px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-block;
}

.back-btn:hover {
    color: var(--text-main);
}

input {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px 15px;
    border-radius: 10px;
    color: white;
    margin-bottom: 15px;
    outline: none;
}

input:focus {
    border-color: var(--primary);
}