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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 100%;
    padding: 32px;
}

header {
    text-align: center;
    margin-bottom: 24px;
}

h1 {
    font-size: 28px;
    color: #1a202c;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 13px;
    color: #718096;
}

.total-display {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 24px;
}

.total-label {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.total-amount {
    font-size: 42px;
    font-weight: bold;
}

.expense-form {
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 16px;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #2d3748;
    margin-bottom: 6px;
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
}

.add-button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.add-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.4);
}

.add-button:active {
    transform: translateY(0);
}

.expense-list-container h2 {
    font-size: 18px;
    color: #2d3748;
    margin-bottom: 16px;
}

.expense-list {
    list-style: none;
}

.expense-list li {
    padding: 14px 16px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.expense-list li:last-child {
    border-bottom: none;
}

.empty-state {
    color: #a0aec0;
    font-style: italic;
    text-align: center;
    padding: 32px 16px !important;
}

.expense-description {
    color: #2d3748;
    font-weight: 500;
}

.expense-amount {
    color: #667eea;
    font-weight: 600;
    font-size: 16px;
}

@media (max-width: 600px) {
    .container {
        padding: 24px;
    }

    h1 {
        font-size: 24px;
    }

    .total-amount {
        font-size: 36px;
    }
}