:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 8px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    padding: 2rem 1rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    margin-bottom: 2rem;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-color);
}

.subtitle {
    color: var(--text-light);
    font-size: 1rem;
}

main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.quick-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.date-range-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-light);
}

input[type="date"] {
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

input[type="date"]:focus {
    border-color: var(--primary-color);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
    font-size: 0.875rem;
}

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

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

.btn-primary:disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-secondary {
    background-color: white;
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
    color: var(--secondary-hover);
}

.btn-large {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    font-weight: 600;
}

.message {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    text-align: center;
}

.message.success {
    background-color: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.message.error {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fee2e2;
}

.hidden {
    display: none !important;
}

.reports-table {
    width: 100%;
    border-collapse: collapse;
}

.reports-table th {
    text-align: left;
    padding: 0.75rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
}

.reports-table td {
    padding: 1rem 0.75rem;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.btn-download {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.8125rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.75rem;
    border-radius: 4px;
    background-color: #eff6ff;
    transition: all 0.2s;
}

.btn-download:hover {
    background-color: #dbeafe;
    text-decoration: none;
}

.date-range-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background-color: #f1f5f9;
    border-radius: 4px;
    color: var(--text-color);
    font-family: monospace;
    font-size: 0.75rem;
}

.empty-state {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-light);
    font-style: italic;
}

footer {
    margin-top: 3rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-light);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
    margin-left: 0.5rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 640px) {
    .date-range-form {
        grid-template-columns: 1fr;
    }

    .quick-actions {
        flex-direction: column;
    }
}

/* Authentication Styles */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    padding: 1rem;
}

.login-card {
    max-width: 400px;
    width: 100%;
    text-align: center;
}

#password-input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    width: 100%;
    margin-bottom: 0.5rem;
}

#password-input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}