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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f4f5f7;
    color: #222;
    padding: 20px;
}

.page {
    max-width: 960px;
    margin: 0 auto;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    margin-bottom: 24px;
}

.campaign-header {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.campaign-image-wrapper {
    flex: 0 0 220px;
    max-width: 100%;
}

.campaign-image {
    width: 100%;
    border-radius: 10px;
    object-fit: cover;
}

.campaign-content {
    flex: 1 1 260px;
}

.campaign-title {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.campaign-description {
    color: #555;
    line-height: 1.5;
    margin-bottom: 8px;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    font-size: 0.75rem;
    border-radius: 999px;
    background: #e6f4ff;
    color: #095aba;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.form-group {
    margin-bottom: 14px;
}

label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 4px;
}

input[type="email"] {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #ccd0d5;
    font-size: 0.95rem;
}

input[type="email"]:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 999px;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    background: #2563eb;
    color: #fff;
    transition: transform 0.05s ease, box-shadow 0.1s ease, background 0.1s ease;
}

.btn:active {
    transform: translateY(1px) scale(0.99);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
    background: #1d4ed8;
}

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.helper-text {
    font-size: 0.8rem;
    color: #777;
}

.error-text {
    font-size: 0.85rem;
    color: #b91c1c;
    margin-top: 6px;
}

.success-text {
    font-size: 0.9rem;
    color: #15803d;
    margin-top: 6px;
}

.coupon-wrapper {
    display: none; /* skryté, kým sa nezaregistruje */
    animation: fadeIn 0.25s ease-out;
}

.coupon-code {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 8px;
    background: #2563eb;
    color: #e5e7eb;
    font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.9rem;
    letter-spacing: 0.08em;
}

.coupon-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    opacity: 0.7;
}

.product-card {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 18px;
}

.product-image-wrapper {
    flex: 0 0 180px;
    max-width: 100%;
}

.product-image {
    width: 100%;
    border-radius: 10px;
    object-fit: cover;
    background: #f3f4f6;
}

.product-details {
    flex: 1 1 220px;
}

.product-title {
    font-size: 1.2rem;
    margin-bottom: 6px;
}

.product-sku {
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 10px;
}

.product-price {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.product-price small {
    font-size: 0.9rem;
    font-weight: 400;
    color: #6b7280;
    margin-left: 4px;
}

.product-meta {
    font-size: 0.9rem;
    color: #4b5563;
}

.divider {
    height: 1px;
    background: #e5e7eb;
    margin: 16px 0;
}

#campaign-loading {
    text-align: center;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
    .campaign-header,
    .product-card {
        flex-direction: column;
    }

    .campaign-title {
        font-size: 1.5rem;
    }

    body {
        padding-bottom: 100px;
    }
}