:root {
    --bg-color-main: #0a0e17;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --color-income: #10b981;
    --color-expense: #ef4444;
    --color-accent: #6366f1;
    --color-accent-hover: #4f46e5;
    --font-family: 'Outfit', sans-serif;
    --blur-xl: blur(20px);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color-main);
    background-image: 
        radial-gradient(ellipse at 10% 10%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
        radial-gradient(ellipse at 90% 90%, rgba(16, 185, 129, 0.1) 0%, transparent 40%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 450px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 2.5rem;
    backdrop-filter: var(--blur-xl);
    -webkit-backdrop-filter: var(--blur-xl);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.6s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.balance-container {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(99, 102, 241, 0.05));
    border-radius: 16px;
    border: 1px solid rgba(99, 102, 241, 0.2);
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.2);
}

.balance-container p {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.balance-container h2 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.summary {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.summary-card {
    flex: 1;
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--card-border);
    padding: 1.25rem;
    border-radius: 16px;
    text-align: center;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.summary-card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

.summary-card h4 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.money {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.money.plus {
    color: var(--color-income);
}

.money.minus {
    color: var(--color-expense);
}

h3 {
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.list {
    list-style-type: none;
    margin-bottom: 2.5rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.5rem;
    overflow-x: hidden;
}

/* Custom Scrollbar */
.list::-webkit-scrollbar {
    width: 6px;
}
.list::-webkit-scrollbar-track {
    background: transparent;
}
.list::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
}
.list::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.2);
}

.list li {
    background: rgba(0,0,0,0.25);
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.875rem 1rem;
    margin-bottom: 0.75rem;
    border-radius: 12px;
    position: relative;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.list li:hover {
    background: rgba(0,0,0,0.4);
}

.list li.plus {
    border-left-color: var(--color-income);
}

.list li.minus {
    border-left-color: var(--color-expense);
}

.delete-btn {
    cursor: pointer;
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-expense);
    border: none;
    font-size: 1rem;
    padding: 0.4rem;
    border-radius: 8px;
    opacity: 0;
    transition: all 0.2s ease;
    position: absolute;
    right: -40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.list li:hover .delete-btn {
    opacity: 1;
    right: 10px;
}

.delete-btn:hover {
    background-color: var(--color-expense);
    color: white;
}

.amount-display {
    transition: transform 0.2s ease;
    font-weight: 600;
}

.list li:hover .amount-display {
    transform: translateX(-35px);
}

.desc-display {
    font-size: 0.95rem;
}

.form-control {
    margin-bottom: 1.25rem;
}

.form-control label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.form-control small {
    font-size: 0.75rem;
    opacity: 0.7;
}

.form-control input {
    width: 100%;
    padding: 0.875rem;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    background: rgba(0,0,0,0.2);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: rgba(0,0,0,0.4);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-control input::placeholder {
    color: rgba(255,255,255,0.2);
}

.btn {
    cursor: pointer;
    background-color: var(--color-accent);
    color: #fff;
    border: none;
    display: block;
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-family);
    border-radius: 12px;
    margin-top: 1.5rem;
    transition: background-color 0.3s ease, transform 0.1s ease, box-shadow 0.3s ease;
}

.btn:hover {
    background-color: var(--color-accent-hover);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn:active {
    transform: scale(0.98);
}

@media (max-width: 480px) {
    .app-container {
        padding: 1.5rem;
        border-radius: 16px;
    }
    .summary {
        flex-direction: column;
    }
}