:root {
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --primary: #2ecc71;
    --danger: #e74c3c;
    --text-main: #2c3e50;
    --text-muted: #7f8c8d;
    --radius: 16px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

#app {
    max-width: 500px;
    margin: 0 auto;
    padding-bottom: 40px;
}

header {
    background: linear-gradient(135deg, #1abc9c, #2ecc71);
    color: white;
    padding: 30px 20px;
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

header h1 { font-size: 1.5rem; }
header p { opacity: 0.9; font-size: 0.9rem; }

main { padding: 20px; }

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.summary-card { text-align: center; }
.balance-info span { color: var(--text-muted); font-size: 0.9rem; }
.balance-info h2 { font-size: 2.2rem; margin: 10px 0; color: var(--primary); }

.progress-container {
    background: #eee;
    height: 10px;
    border-radius: 5px;
    margin: 15px 0;
    overflow: hidden;
}

.progress-bar {
    background: var(--primary);
    height: 100%;
    width: 0%;
    transition: width 0.8s cubic-bezier(0.17, 0.67, 0.83, 0.67);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 15px;
}

.stat-item small { color: var(--text-muted); }
.stat-item p { font-weight: 600; }

h3 { font-size: 1rem; margin-bottom: 15px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

.input-group { margin-bottom: 15px; }
label { display: block; font-size: 0.85rem; margin-bottom: 5px; color: var(--text-muted); }

input, select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 1rem;
    margin-bottom: 10px;
    outline: none;
}

input:focus { border-color: var(--primary); }

.row { display: flex; gap: 10px; }

button {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.1s;
}

button:active { transform: scale(0.98); }

.btn-primary { background-color: var(--primary); color: white; }
.btn-secondary { background-color: #34495e; color: white; }

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: white;
    margin-bottom: 10px;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.transaction-item.expense { border-left-color: var(--danger); }

.trans-info strong { display: block; }
.trans-info small { color: var(--text-muted); }

.trans-amount { font-weight: 700; }
.expense .trans-amount { color: var(--danger); }
.income .trans-amount { color: var(--primary); }