:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --bg-color: #F3F4F6;
    --card-bg: #FFFFFF;
    --text-main: #111827;
    --text-muted: #6B7280;
    --danger: #EF4444;
    --danger-hover: #DC2626;
    --success: #10B981;
    --border-color: #E5E7EB;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: linear-gradient(rgba(243, 244, 246, 0.85), rgba(243, 244, 246, 0.85)), url('../img/inner_wallpaper.jpg') no-repeat center center fixed;
    background-size: cover;
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    background-color: transparent;
    position: relative;
    padding-bottom: 2rem;
}

/* Header */
.header {
    background-color: var(--primary-color);
    color: white;
    padding: 1.5rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom-left-radius: 1.5rem;
    border-bottom-right-radius: 1.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: -1.5rem;
    padding-bottom: 3rem;
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 1.2rem;
    text-decoration: none;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Content Area */
.content-area {
    padding: 0 1.25rem;
    margin-top: 1rem;
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-decoration: none;
    color: var(--text-main);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.card-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.card-info p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.card-balance {
    text-align: right;
}

.card-balance .amount {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary-color);
}

.card-balance .type {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.action-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s;
}

.action-btn:hover {
    color: var(--primary-color);
}

.action-btn.delete:hover {
    color: var(--danger);
}

/* PIN Screen */
.pin-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--card-bg);
    padding: 2rem;
}

.pin-screen h2 {
    margin-bottom: 2rem;
    font-size: 1.5rem;
    color: var(--text-main);
}

.pin-input {
    width: 100%;
    max-width: 250px;
    font-size: 2rem;
    text-align: center;
    letter-spacing: 0.5em;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    transition: border-color 0.2s;
}

.pin-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-color);
    transition: border-color 0.2s;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: var(--bg-color);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #E5E7EB;
}

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

.btn-danger:hover {
    background-color: var(--danger-hover);
}

.btn-block {
    width: 100%;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 400px;
    padding: 1.5rem;
    transform: translateY(20px);
    transition: transform 0.2s;
    box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* Utilities */
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }

/* Radio groups */
.radio-group {
    display: flex;
    gap: 1rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

/* Transaction List */
.transaction-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.transaction-item:last-child {
    border-bottom: none;
}
.transaction-details .date {
    font-size: 0.75rem;
    color: var(--text-muted);
}
.transaction-details .desc {
    font-weight: 500;
}
.transaction-details .meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Side Menu */
.side-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--card-bg);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    transition: right 0.3s ease;
    padding: 2rem 1rem;
}
.side-menu.open {
    right: 0;
}
.menu-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}
.menu-list {
    list-style: none;
    margin-top: 2rem;
}
.menu-list li a {
    display: block;
    padding: 1rem;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}
.menu-list li a:hover {
    background-color: var(--bg-color);
}

/* Global Loader */
.global-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.global-loader.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}