:root {
    --primary-color: #03045E;
    --secondary-color: #023E8A;
    --accent-color: #0077B6;
    --light-accent: #0096C7;
    --lightest-accent: #90E0EF;
    --background: #F8F9FA;
    --surface: #FFFFFF;
    --text-primary: #212529;
    --text-secondary: #6C757D;
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;
    --border: #DEE2E6;
    --shadow: rgba(0, 0, 0, 0.1);
    --paper-texture: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f1f3f4' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    background-image: var(--paper-texture);
    color: var(--text-primary);
    line-height: 1.6;
    padding-bottom: 80px;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: 0 2px 10px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.header-content h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.profile-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.3s ease;
}

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

/* Main Content */
.app-main {
    margin-top: 80px;
    padding: 1rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.app-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.app-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Welcome Card */
.welcome-card {
    background: linear-gradient(135deg, var(--accent-color), var(--light-accent));
    color: white;
    padding: 2rem;
    border-radius: 16px;
    margin-bottom: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 119, 182, 0.3);
}

.welcome-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Quick Stats */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow);
    text-align: center;
    border: 1px solid var(--border);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Children List */
.children-list {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
}

.children-list h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--border);
}

.child-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.child-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow);
}

.child-card-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.child-avatar {
    font-size: 2rem;
    margin-right: 1rem;
}

.child-info h4 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.child-age {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.child-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.child-stat {
    text-align: center;
    padding: 0.5rem;
    background: var(--background);
    border-radius: 8px;
}

.child-stat-value {
    display: block;
    font-weight: 600;
    color: var(--primary-color);
}

.child-stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.child-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.section-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger, .btn-small {
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
}

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

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

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

.btn-danger:hover {
    background: #c82333;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    background: var(--lightest-accent);
    color: var(--primary-color);
}

.btn-small:hover {
    background: var(--light-accent);
    color: white;
}

/* Reports */
.period-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
}

.report-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.report-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
}

.report-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.report-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.chart-container {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}

.chart-container canvas {
    width: 100% !important;
    height: 200px !important;
}

.insights-section {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
}

.insights-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.insight-item {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: var(--background);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

/* Settings */
.settings-groups {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.settings-group {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
}

.settings-group h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.setting-item {
    margin-bottom: 1rem;
}

.setting-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    padding: 0.5rem 0;
}

.setting-text {
    flex: 1;
    margin-right: 1rem;
}

.setting-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.setting-input {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--text-primary);
    width: 120px;
}

.danger-zone {
    background: rgba(220, 53, 69, 0.1);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--danger);
    margin-top: 2rem;
}

.danger-zone h3 {
    color: var(--danger);
    margin-bottom: 1rem;
}

/* FAQ */
.faq-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: var(--background);
}

.faq-question[aria-expanded="true"] {
    background: var(--lightest-accent);
}

.faq-icon {
    font-size: 1.2rem;
    font-weight: bold;
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
    animation: slideDown 0.3s ease-out;
}

.faq-answer[hidden] {
    display: none;
}

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

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    z-index: 100;
    box-shadow: 0 -2px 10px var(--shadow);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    min-width: 60px;
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

.nav-item.active {
    color: var(--accent-color);
    background: var(--lightest-accent);
}

.nav-item:hover {
    color: var(--accent-color);
    background: rgba(144, 224, 239, 0.3);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: fadeIn 0.3s ease-out;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-content {
    background: var(--surface);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-out;
}

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

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    color: var(--primary-color);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 119, 182, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

/* Children Management */
.children-management {
    display: grid;
    gap: 1rem;
}

.child-management-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px var(--shadow);
}

.child-management-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.child-management-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.child-management-avatar {
    font-size: 2.5rem;
}

.child-management-details h4 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.child-management-details p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.child-management-actions {
    display: flex;
    gap: 0.5rem;
}

.progress-bar {
    background: var(--border);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success), var(--warning));
    transition: width 0.3s ease;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-main {
        padding: 0.5rem;
    }
    
    .quick-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .report-cards {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .child-management-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .child-management-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.25rem;
    }
    
    .welcome-card {
        padding: 1.5rem;
    }
    
    .quick-stats {
        grid-template-columns: 1fr;
    }
    
    .nav-item span {
        display: none;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-height: 95vh;
    }
    
    .stat-card {
        padding: 1rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --shadow: rgba(0, 0, 0, 0.5);
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #1a1a1a;
        --surface: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --border: #404040;
        --shadow: rgba(0, 0, 0, 0.3);
    }
}