:root {
    --primary: #008080;
    --primary-dark: #006666;
    --secondary: #2ecc71;
    --danger: #e74c3c;
    --background: #f4f7f6;
    --surface: #ffffff;
    --text: #2c3e50;
    --text-muted: #7f8c8d;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    padding-bottom: 80px; /* footer space */
}

h1, h2, h3 {
    margin-bottom: 1rem;
}

.container {
    padding: 1rem;
}

/* Card Styling */
.card {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.05);
}

.glass-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Button Styling */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    text-align: center;
}

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

.btn-primary:active {
    transform: scale(0.98);
    background-color: var(--primary-dark);
}

.btn-block {
    display: block;
    width: 100%;
}

/* Navigation Bar (Bottom) */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 600px;
    background: var(--surface);
    display: flex;
    justify-content: space-around;
    padding: 0.8rem 0;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
}

.nav-item {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.nav-item.active {
    color: var(--primary);
}

.nav-icon {
    font-size: 1.5rem;
    margin-bottom: 2px;
}

/* Transaction List */
.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
}

.transaction-item:last-child {
    border-bottom: none;
}

.amount-income {
    color: var(--secondary);
    font-weight: bold;
}

.amount-expense {
    color: var(--danger);
    font-weight: bold;
}

/* Badge */
.badge {
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-income { background: #e8f8f5; color: #27ae60; }
.badge-expense { background: #fdf2f2; color: #c0392b; }

/* Dashboard Balance */
.balance-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 2rem;
    text-align: center;
}

.balance-amount {
    font-size: 2rem;
    font-weight: 800;
    margin: 10px 0;
}

/* Forms */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}