:root {
    /* Clean Light Theme Colors */
    --bg-light: #f0f4f8;
    --bg-gradient: linear-gradient(135deg, #e2e8f0 0%, #f8fafc 100%);
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(255, 255, 255, 0.8);
    
    --accent: #4f46e5; /* Indigo */
    --accent-glow: rgba(79, 70, 229, 0.3);
    
    --success: #059669; /* Darker Green for light bg */
    --danger: #e11d48; /* Darker Red for light bg */
    
    --text-main: #0f172a; /* Near Black */
    --text-muted: #64748b; /* Gray */
    --toggle-dark: #1e293b; /* The "Black Box" */
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Poppins', sans-serif; }

body { 
    background: var(--bg-gradient); 
    background-attachment: fixed;
    color: var(--text-main); 
    padding: 2rem 1rem; 
    display: flex; 
    justify-content: center; 
    min-height: 100vh;
}

.container { max-width: 900px; width: 100%; }

/* Header Styling */
header { text-align: center; margin-bottom: 2.5rem; }
h1 { font-size: 2.5rem; font-weight: 600; letter-spacing: -1px; }
h1 span { color: var(--accent); }
.subtitle { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.2rem; }

/* Dashboard Cards */
.dashboard { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.card { 
    background: var(--glass-bg); 
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 1.5rem; 
    border-radius: 16px; 
    text-align: center; 
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0,0,0,0.08); }
.card h3 { font-size: 0.9rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 0.5rem; }
.card p { font-size: 1.8rem; font-weight: 600; }

.balance-card { background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(255,255,255,0.5)); border-color: rgba(79, 70, 229, 0.2); }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }

/* Glass Panels */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.8rem;
    backdrop-filter: blur(16px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
}

.controls { display: grid; grid-template-columns: 1.5fr 1fr; gap: 1.5rem; margin-bottom: 2rem; }
h2 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1.5rem; color: var(--accent); }

/* Form Elements */
.input-row { display: flex; gap: 1rem; }
.input-row .form-group { flex: 1; }
.form-group { margin-bottom: 1.2rem; }
label { display: block; margin-bottom: 0.4rem; font-size: 0.85rem; font-weight: 500; color: var(--text-muted); }

input[type="number"], input[type="date"], select { 
    width: 100%; 
    padding: 0.8rem 1rem; 
    background: rgba(255,255,255,0.8); 
    border: 1px solid #cbd5e1; 
    border-radius: 8px; 
    color: var(--text-main);
    font-size: 0.95rem;
    transition: border 0.3s ease, box-shadow 0.3s ease;
}
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

/* --- THE NEW TOGGLE SWITCH --- */
.type-toggle {
    position: relative;
    display: flex;
    background: rgba(203, 213, 225, 0.4);
    border-radius: 8px;
    padding: 0.25rem;
    overflow: hidden;
}
.type-toggle input[type="radio"] { display: none; }
.type-toggle .toggle-btn {
    flex: 1;
    text-align: center;
    padding: 0.55rem 0;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    position: relative;
    z-index: 2;
    transition: color 0.3s ease;
}
/* The Black Box */
.type-toggle .slider {
    position: absolute;
    top: 0.25rem;
    bottom: 0.25rem;
    left: 0.25rem;
    width: calc(50% - 0.25rem);
    background: var(--toggle-dark);
    border-radius: 6px;
    z-index: 1;
    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}
/* Change text color to white when the black box slides under it */
#type-expense:checked ~ label[for="type-expense"],
#type-income:checked ~ label[for="type-income"] { color: white; }

/* Move the slider depending on which radio is checked */
#type-income:checked ~ .slider { transform: translateX(100%); }
/* ----------------------------- */

/* Button */
.glow-btn { 
    background: linear-gradient(135deg, var(--accent), #4338ca); 
    color: white; 
    border: none; 
    padding: 0.9rem; 
    width: 100%;
    border-radius: 8px;
    cursor: pointer; 
    font-weight: 600; 
    font-size: 1rem;
    margin-top: 0.5rem; 
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px var(--accent-glow);
}
.glow-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(79, 70, 229, 0.4); }

/* Transaction List */
.transaction-item { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 1rem; 
    background: white;
    border-radius: 8px;
    margin-bottom: 0.8rem;
    border-left: 4px solid transparent;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    transition: transform 0.2s ease;
}
.transaction-item:hover { transform: translateX(5px); }

.transaction-item:has(.text-success) { border-left-color: var(--success); }
.transaction-item:has(.text-danger) { border-left-color: var(--danger); }

.t-info span { display: block; }
.t-title { font-weight: 600; font-size: 1.05rem; }
.t-date { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.2rem;}
.t-amount { font-weight: 600; display: flex; align-items: center; gap: 1rem; font-size: 1.1rem; }

/* Delete Button */
.delete-btn { 
    background: transparent; 
    color: var(--text-muted); 
    border: 1px solid #cbd5e1;
    width: 28px; 
    height: 28px;
    border-radius: 50%;
    font-size: 0.7rem; 
    cursor: pointer;
    transition: all 0.2s ease;
}
.delete-btn:hover { background: var(--danger); color: white; border-color: var(--danger); }

@media (max-width: 768px) {
    .controls { grid-template-columns: 1fr; }
    .input-row { flex-direction: column; gap: 0; }
}