/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    overflow-x: hidden;
}

/* Page Management */
.page {
    display: none;
    min-height: 100vh;
}

.page.active {
    display: block;
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.5rem;
    color: #667eea;
    font-weight: 700;
}

.header-button {
    background: #667eea;
    color: white;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 70px;
    min-height: 44px;
}

.header-button:active {
    transform: scale(0.95);
    background: #5568d3;
}

.header-button.done {
    background: #51cf66;
}

/* Children List */
.children-list {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.child-item {
    background: white;
    border-radius: 15px;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    min-height: 80px;
    border-left: 6px solid;
    cursor: pointer;
}

.child-item:active {
    transform: scale(0.98);
}

.child-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.child-info h3 {
    font-size: 1.25rem;
    color: #333;
}

.child-info .points {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

.child-controls {
    display: none;
    gap: 0.5rem;
    align-items: center;
}

.edit-mode .child-controls {
    display: flex;
}

.edit-mode .child-item {
    cursor: default;
}

.control-button {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 10px;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.control-button:active {
    transform: scale(0.9);
}

.delete-button {
    background: #ff6b6b;
    color: white;
}

.up-button, .down-button {
    background: #667eea;
    color: white;
}

.up-button:disabled, .down-button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* Add Child Form */
.add-child-form {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.95);
    margin: 0 1rem 1rem 1rem;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.add-child-form.hidden {
    display: none;
}

.add-child-form input[type="text"] {
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    min-height: 44px;
}

.add-child-form input[type="color"] {
    width: 100%;
    height: 50px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    cursor: pointer;
}

.button-primary {
    background: #51cf66;
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 50px;
}

.button-primary:active {
    transform: scale(0.98);
    background: #40c057;
}

/* Number Pad Page */
.child-header {
    padding: 1.5rem;
    color: white;
    text-align: center;
    position: relative;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.back-button {
    position: absolute;
    left: 1rem;
    top: 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    padding: 0.5rem 1rem;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    min-height: 44px;
    min-width: 80px;
}

.back-button:active {
    background: rgba(255, 255, 255, 0.3);
}

.child-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.current-points {
    font-size: 2.5rem;
    font-weight: 700;
}

/* Number Pad Container */
.number-pad-container {
    padding: 1rem;
    background: white;
    min-height: calc(100vh - 180px);
    border-radius: 30px 30px 0 0;
    margin-top: -20px;
}

.transaction-display {
    margin-bottom: 1rem;
}

.transaction-input {
    width: 100%;
    padding: 1rem;
    font-size: 2rem;
    text-align: right;
    border: 3px solid #667eea;
    border-radius: 15px;
    background: #f8f9ff;
    color: #333;
    font-weight: 600;
}

/* Number Pad */
.number-pad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.num-button {
    background: #f0f0f0;
    border: none;
    border-radius: 15px;
    font-size: 1.75rem;
    font-weight: 600;
    color: #333;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 70px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.num-button:active {
    transform: scale(0.95);
    background: #e0e0e0;
}

.num-button.clear {
    background: #ff6b6b;
    color: white;
}

.num-button.backspace {
    background: #ffa94d;
    color: white;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.button-add, .button-remove {
    padding: 1rem;
    border: none;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 60px;
    color: white;
}

.button-add {
    background: #51cf66;
}

.button-add:active:not(:disabled) {
    background: #40c057;
}

.button-remove {
    background: #ff6b6b;
}

.button-remove:active:not(:disabled) {
    background: #fa5252;
}

.button-add:disabled, .button-remove:disabled {
    background: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
}

/* Confirmation Section */
.confirm-section {
    background: #fff3bf;
    border: 3px solid #ffd43b;
    border-radius: 15px;
    padding: 1rem;
    margin-bottom: 1rem;
    text-align: center;
}

.confirm-section.hidden {
    display: none;
}

.confirm-section p {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.confirm-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.button-confirm, .button-cancel {
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    min-height: 50px;
}

.button-confirm {
    background: #51cf66;
    color: white;
}

.button-confirm:active {
    background: #40c057;
}

.button-cancel {
    background: #868e96;
    color: white;
}

.button-cancel:active {
    background: #6c757d;
}

/* Recent Transactions */
.recent-transactions {
    margin-top: 1.5rem;
}

.recent-transactions h3 {
    color: #667eea;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.transaction-item {
    background: #f8f9ff;
    padding: 0.75rem;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.transaction-item.add {
    border-left: 4px solid #51cf66;
}

.transaction-item.remove {
    border-left: 4px solid #ff6b6b;
}

.transaction-item .amount {
    font-weight: 700;
    font-size: 1.1rem;
}

.transaction-item.add .amount {
    color: #51cf66;
}

.transaction-item.remove .amount {
    color: #ff6b6b;
}

.transaction-item .time {
    font-size: 0.85rem;
    color: #868e96;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-content h3 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.modal-content p {
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.5;
}

.modal-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.button-danger, .button-secondary {
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    min-height: 50px;
}

.button-danger {
    background: #ff6b6b;
    color: white;
}

.button-danger:active {
    background: #fa5252;
}

.button-secondary {
    background: #e9ecef;
    color: #333;
}

.button-secondary:active {
    background: #dee2e6;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: white;
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    font-size: 1rem;
    opacity: 0.9;
}

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

/* Responsive adjustments for larger screens */
@media (min-width: 768px) {
    body {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .page {
        max-width: 500px;
        width: 100%;
        box-shadow: 0 10px 50px rgba(0, 0, 0, 0.2);
        border-radius: 20px;
        overflow: hidden;
    }
}