/* Custom properties for Light/Dark themes and sizing variables */
:root {
    --font-primary: 'Plus Jakarta Sans', sans-serif;
    
    /* Theme Light: Default */
    --bg-app: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --bg-container: rgba(255, 255, 255, 0.7);
    --bg-card: rgba(255, 255, 255, 0.65);
    --border-color: rgba(255, 255, 255, 0.5);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --shadow-main: 0 10px 30px -5px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 20px 40px -10px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);

    /* ACCENT COLORS */
    --color-primary: #4f46e5;
    --color-primary-rgb: 79, 70, 229;
    --color-primary-light: #818cf8;
    
    --color-success: #10b981;
    --color-success-rgb: 16, 185, 129;
    
    --color-warning: #f59e0b;
    --color-warning-rgb: 245, 158, 11;
    
    --color-danger: #ef4444;
    
    /* Sizing & Transitions */
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 8px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme overrides */
[data-theme="dark"] {
    --bg-app: radial-gradient(circle at top left, #0f172a, #020617);
    --bg-container: rgba(15, 23, 42, 0.6);
    --bg-card: rgba(30, 41, 59, 0.45);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --shadow-main: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 20px 50px -15px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.35);
}

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-primary);
}

body {
    min-height: 100vh;
    background: var(--bg-app);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
    transition: background var(--transition-normal);
    overflow-x: hidden;
}

/* Smooth Scrolling & Accessibility */
html {
    scroll-behavior: smooth;
}

input:focus, button:focus {
    outline: none;
}

/* Wrapper to constrain max-width and center on desktop */
.app-wrapper {
    width: 100%;
    max-width: 1100px;
    background: var(--bg-container);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-main);
    padding: 24px;
    margin: 0 auto;
    transition: background var(--transition-normal), border var(--transition-normal);
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 2rem;
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.1);
    padding: 10px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-glow);
}

.logo-text h1 {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.theme-toggle-btn:hover {
    transform: scale(1.05);
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

/* Reusable Glass Card Style */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-main);
    padding: 20px;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
}

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

/* Card Header */
.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
}

.icon-accent {
    font-size: 1.4rem;
    color: var(--color-primary);
}

/* Stats Layout */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
}

.border-left-blue::before { background: var(--color-primary); }
.border-left-green::before { background: var(--color-success); }
.border-left-orange::before { background: var(--color-warning); }

.stat-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    margin-right: 12px;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.stat-val {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.debt-note-badge {
    align-self: flex-start;
    margin-top: 6px;
    font-size: 0.65rem;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    font-weight: 600;
}

.stat-icon-wrapper {
    width: 46px;
    height: 46px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.icon-blue {
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
}

.icon-green {
    background: rgba(var(--color-success-rgb), 0.1);
    color: var(--color-success);
}

.icon-orange {
    background: rgba(var(--color-warning-rgb), 0.1);
    color: var(--color-warning);
}

/* Progress Circular Card */
.progress-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
}

.progress-radial-container {
    position: relative;
    width: 80px;
    height: 80px;
}

.radial-progress-svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.circle-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 8;
}

.circle-progress {
    fill: none;
    stroke: var(--color-success);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 251.2; /* 2 * PI * radius (40) = 251.2 */
    stroke-dashoffset: 251.2; /* Starts at 0% (fully offset) */
    transition: stroke-dashoffset 0.8s ease-in-out;
}

.progress-percentage-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    display: flex;
    flex-direction: column;
}

.percent-num {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
}

.percent-label {
    font-size: 0.6rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.edit-debt-btn {
    font-weight: 600;
    font-size: 0.75rem;
}

/* Layout Grid for Main Panels */
.main-content {
    margin-bottom: 24px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.content-grid-full {
    width: 100%;
}

@media (min-width: 768px) {
    .content-grid {
        grid-template-columns: 1.1fr 1.9fr;
    }
}

/* Form Styles */
.form-group {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input {
    background: rgba(255, 255, 255, 0.05);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.15);
}

/* Input layout for currency */
.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper .currency-symbol {
    position: absolute;
    left: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-wrapper input {
    width: 100%;
    padding-left: 32px;
}

/* Buttons styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.btn-primary:hover {
    background: var(--color-primary-light);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
}

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

.btn-text {
    background: transparent;
    border: none;
    padding: 6px 12px;
}

.btn-text:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-full {
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

.text-danger {
    color: var(--color-danger);
}

.text-danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Table Card Custom Flex Header */
.card-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.card-header-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header-title h2 {
    font-size: 1.1rem;
    font-weight: 700;
}

.count-badge {
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
}

/* Table Container (Allows horizontal scroll on small devices) */
.table-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.payment-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.payment-table th, .payment-table td {
    padding: 12px 16px;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border-color);
}

.payment-table th {
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.5px;
}

.payment-table tbody tr {
    transition: background var(--transition-fast);
}

.payment-table tbody tr:hover {
    background: rgba(var(--color-primary-rgb), 0.03);
}

.payment-table tbody tr:last-child td {
    border-bottom: none;
}

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

/* Payment Status / Details in List row */
.payment-amount-text {
    font-weight: 700;
    color: var(--color-success);
}

.payment-date-text {
    color: var(--text-secondary);
    font-weight: 500;
}

.payment-note-text {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.btn-delete {
    color: var(--text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.btn-delete:hover {
    color: var(--color-danger);
    background: rgba(239, 68, 68, 0.1);
}

/* Empty State Styling */
.empty-state-row:hover {
    background: transparent !important;
}

.empty-state-cell {
    padding: 40px 10px !important;
    text-align: center;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
    opacity: 0.5;
}

.empty-state-cell p {
    font-size: 0.85rem;
    font-weight: 500;
}

/* Setup Overlay and Dialog */
.setup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: opacity var(--transition-normal);
}

.setup-card {
    width: 100%;
    max-width: 450px;
    animation: scaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* General Modals styling */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 1;
    transition: opacity var(--transition-normal);
}

.modal-content {
    width: 100%;
    max-width: 450px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-size: 1.15rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 8px;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

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

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* Animations */
@keyframes scaleUp {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-slide-up {
    animation: slideUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

/* Utility Hidden state */
.hidden {
    display: none !important;
}

/* App Footer */
.app-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
}

@media (min-width: 600px) {
    .app-footer {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* Toast System */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
    max-width: 320px;
    width: 100%;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--color-primary);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-hover);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    backdrop-filter: blur(10px);
    animation: slideInLeft 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    font-size: 0.8rem;
    font-weight: 600;
}

.toast.toast-success {
    border-left-color: var(--color-success);
}

.toast.toast-danger {
    border-left-color: var(--color-danger);
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.fade-out {
    animation: fadeOut 0.3s ease-out forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(10px);
    }
}

/* Mobile adjustments (Under 600px) */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    .app-wrapper {
        padding: 16px;
        border-radius: var(--radius-md);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .stat-card {
        padding: 16px;
    }
    
    .progress-card {
        flex-direction: row;
        justify-content: space-between;
        padding: 16px;
    }
    
    .progress-radial-container {
        width: 65px;
        height: 65px;
    }
    
    .percent-num {
        font-size: 0.95rem;
    }
    
    .payment-table th, .payment-table td {
        padding: 10px 8px;
    }
    
    .payment-table th {
        font-size: 0.65rem;
    }
    
    .payment-table td {
        font-size: 0.8rem;
    }
    
    .toast-container {
        right: 10px;
        left: 10px;
        bottom: 10px;
        max-width: none;
        width: calc(100% - 20px);
    }
}

/* Dropdown Menu Styles */
.debt-card-relative {
    position: relative;
}

.stat-actions-container {
    position: absolute;
    top: 14px;
    right: 14px;
    z-index: 5;
}

/* Mini Progress Bar inside cards */
.progress-bar-wrapper {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: var(--radius-sm);
    margin-top: 8px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-success), var(--color-primary-light));
    border-radius: var(--radius-sm);
    width: 0%;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.menu-trigger-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.menu-trigger-btn:hover {
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-hover);
    z-index: 50;
    min-width: 150px;
    overflow: hidden;
    animation: scaleUp 0.15s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.dropdown-item {
    width: 100%;
    background: transparent;
    border: none;
    padding: 10px 14px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background var(--transition-fast);
}

.dropdown-item:hover {
    background: rgba(var(--color-primary-rgb), 0.08);
    color: var(--color-primary);
}

/* Row dropdown styles */
.menu-cell {
    width: 40px;
    text-align: center;
    padding: 10px 0 !important;
}

.row-menu-container {
    position: relative;
    display: inline-block;
}

.row-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.15rem;
    cursor: pointer;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.row-menu-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.row-dropdown-menu {
    left: 0;
    right: auto;
}

/* Modal Headers customization for Warnings/Danger */
.header-danger {
    background: linear-gradient(135deg, var(--color-danger), #b91c1c);
    color: #fff;
    padding: 16px 20px;
    border-bottom: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-warning {
    background: linear-gradient(135deg, var(--color-warning), #d97706);
    color: #fff;
    padding: 16px 20px;
    border-bottom: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.border-danger {
    border-color: rgba(239, 68, 68, 0.3) !important;
    box-shadow: 0 10px 40px -10px rgba(239, 68, 68, 0.3) !important;
}

.border-warning {
    border-color: rgba(245, 158, 11, 0.3) !important;
    box-shadow: 0 10px 40px -10px rgba(245, 158, 11, 0.3) !important;
}

.warning-alert-icon {
    font-size: 4rem;
    margin-bottom: 12px;
}

.warning-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.warning-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 320px;
    margin: 0 auto;
    line-height: 1.4;
}

.pad-tb-20 {
    padding: 20px 0;
}

.justify-center {
    justify-content: center !important;
}

.text-white {
    color: #ffffff !important;
}

.animate-bounce {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-12px);
    }
    60% {
        transform: translateY(-6px);
    }
}

/* Cloud Sync Status Icon Styles */
.cloud-sync-indicator {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.cloud-sync-indicator:hover {
    transform: scale(1.05);
}

.cloud-sync-indicator.unconfigured {
    color: var(--text-muted);
}

.cloud-sync-indicator.synced {
    color: var(--color-success);
    border-color: rgba(var(--color-success-rgb), 0.3);
    background: rgba(var(--color-success-rgb), 0.05);
}

.cloud-sync-indicator.syncing {
    color: var(--color-warning);
    border-color: rgba(var(--color-warning-rgb), 0.3);
    background: rgba(var(--color-warning-rgb), 0.05);
    animation: pulseGlow 1.5s infinite ease-in-out;
}

.cloud-sync-indicator.error {
    color: var(--color-danger);
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.05);
    animation: shakeError 0.5s ease-in-out;
}

.border-blue {
    border-color: rgba(99, 102, 241, 0.3) !important;
    box-shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.3) !important;
}

@keyframes pulseGlow {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 0 5px rgba(245, 158, 11, 0.2);
    }
    50% {
        opacity: 0.6;
        box-shadow: 0 0 15px rgba(245, 158, 11, 0.6);
    }
}

@keyframes shakeError {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}