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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 40px 0;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    padding: 20px 0;
}

/* Main Content */
main {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

/* Buttons */
.auth-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    padding: 40px 0;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd6;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #e0e0e0;
    color: #333;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

.btn-success {
    background: #4caf50;
    color: white;
}

.btn-success:hover {
    background: #45a049;
}

.btn-delete {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 5px;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px 0;
}

.feature {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
}

.feature h3 {
    margin-bottom: 10px;
    color: #667eea;
}

/* Forms */
.auth-form {
    max-width: 400px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.auth-link {
    text-align: center;
    margin-top: 20px;
}

.auth-link a {
    color: #667eea;
    text-decoration: none;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 20px;
}

.alert {
    padding: 12px 20px;
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 8px;
    color: #856404;
    margin-bottom: 10px;
}

/* Upload Section */
.upload-section {
    margin-bottom: 30px;
}

.upload-section h2 {
    margin-bottom: 15px;
    color: #333;
}

.drop-zone {
    border: 3px dashed #667eea;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    background: #f8f9ff;
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
    background: #e8ebff;
    border-color: #5a6fd6;
}

.drop-zone p {
    font-size: 1.2rem;
    color: #667eea;
    margin-bottom: 5px;
}

.drop-zone p.small {
    font-size: 0.9rem;
    color: #888;
}

/* Expense Form Section */
.expense-form-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.expense-form-section h3 {
    margin-bottom: 20px;
    color: #333;
}

/* Expenses Section */
.expenses-section {
    margin-top: 30px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    color: #333;
}

/* Table */
.expenses-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.expenses-table th,
.expenses-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.expenses-table th {
    font-weight: 600;
    color: #555;
    background: #f8f9fa;
}

.expenses-table tr:hover {
    background: #f8f9fa;
}

.no-expenses {
    text-align: center;
    padding: 40px;
    color: #888;
    font-size: 1.1rem;
}

/* Upload Status */
#upload-status {
    margin-top: 15px;
}

.upload-success {
    padding: 12px;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 8px;
    color: #155724;
}

.upload-error {
    padding: 12px;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 8px;
    color: #721c24;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    color: white;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .dashboard-header {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .section-header {
        flex-direction: column;
        gap: 15px;
    }
    
    .expenses-table {
        font-size: 0.9rem;
    }
    
    .expenses-table th,
    .expenses-table td {
        padding: 8px;
    }
}