:root {
    --primary-color: #2563eb;
    --error-color: #dc2626;
    --success-color: #059669;
    --background-color: #f3f4f6;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.upload-section {
    text-align: center;
    margin-bottom: 2rem;
}

.file-input-wrapper {
    margin: 1.5rem 0;
}

input[type="file"] {
    display: none;
}

label[for="csvFile"] {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

label[for="csvFile"]:hover {
    background-color: #1d4ed8;
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #1d4ed8;
}

.hidden {
    display: none;
}

.error-message {
    color: var(--error-color);
    text-align: center;
    padding: 1rem;
    margin: 1rem 0;
    background-color: #fee2e2;
    border-radius: 4px;
}

.download-section {
    text-align: center;
    margin-top: 2rem;
}

.download-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--success-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    margin: 1rem 0;
    transition: background-color 0.2s;
}

.download-button:hover {
    background-color: #047857;
}

.expiry-note {
    color: #6b7280;
    font-size: 0.875rem;
}

/* Spinner */
.spinner {
    text-align: center;
    margin: 2rem 0;
}

.spinner-inner {
    width: 40px;
    height: 40px;
    margin: 0 auto;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}