:root {
    --primary: #2563eb;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --border: #e2e8f0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
}

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

header {
    margin-bottom: 30px;
}

.dashboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.card h3 { margin: 0; font-size: 0.9rem; color: #64748b; }
.card p { margin: 10px 0 0; font-size: 1.5rem; font-weight: 600; color: var(--primary); }

.add-expense, .expense-list {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
}

.form-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

input, select, button {
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
}

button {
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: opacity 0.2s;
}

button:hover { opacity: 0.9; }

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

th { color: #64748b; font-weight: 600; }