:root {
    --bg-dark: #0f111a;
    --card-bg: rgba(25, 28, 41, 0.7);
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --accent-cyan: #00f3ff;
    --accent-purple: #b026ff;
    --expense-color: #ff4757;
    --income-color: #2ed573;
    --border-radius: 16px;
    --glass-border: 1px solid rgba(255, 255, 255, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
    background-image: radial-gradient(circle at top right, rgba(176, 38, 255, 0.1), transparent 40%),
                      radial-gradient(circle at bottom left, rgba(0, 243, 255, 0.1), transparent 40%);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3 { font-weight: 600; margin-bottom: 1rem; }
.text-cyan { color: var(--accent-cyan); text-shadow: 0 0 10px rgba(0, 243, 255, 0.3); }
.text-expense { color: var(--expense-color); }
.text-income { color: var(--income-color); }

/* Layout & Cards */
.container {
    max-width: 1200px;
    margin: 0 auto;
}

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

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.kpi-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 10px 0;
}

/* Forms & Buttons */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input, select, button {
    width: 100%;
    padding: 12px 16px;
    border-radius: 8px;
    border: none;
    outline: none;
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

input:focus, select:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 8px rgba(0, 243, 255, 0.2);
}

button {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    color: white;
    font-weight: 600;
    cursor: pointer;
    margin-top: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

button:hover {
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.4);
    transform: translateY(-2px);
}

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

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

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

.transaction-info h4 { margin-bottom: 0; }
.transaction-info p { color: var(--text-muted); font-size: 0.8rem; }

/* Desktop Optimizations */
@media (min-width: 768px) {
    .dashboard-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .form-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
}