:root {
    --primary-color: #03045E;
    --secondary-color: #023E8A;
    --accent-color: #0077B6;
    --light-accent: #0096C7;
    --lightest: #90E0EF;
    --white: #FFFFFF;
    --light-gray: #F8F9FA;
    --gray: #6C757D;
    --dark-gray: #343A40;
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;
    --shadow: 0 2px 10px rgba(3, 4, 94, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

* {
    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, var(--lightest) 0%, var(--light-gray) 100%);
    color: var(--dark-gray);
    line-height: 1.6;
    padding-bottom: 80px;
    min-height: 100vh;
}

.app-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 1.5rem 1rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.header-content h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header-content p {
    opacity: 0.9;
    font-size: 0.95rem;
}

.app-main {
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.page-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

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

.section-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--gray);
    font-size: 0.9rem;
}

.welcome-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.welcome-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--gray);
    margin-top: 0.25rem;
}

.quick-actions {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.quick-actions h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.action-buttons {
    display: grid;
    gap: 0.75rem;
}

.action-btn {
    background: linear-gradient(135deg, var(--accent-color), var(--light-accent));
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 119, 182, 0.3);
}

.habit-form {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--lightest);
    border-radius: 8px;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-group input[type="range"] {
    margin-bottom: 0.5rem;
}

#intensityValue {
    display: inline-block;
    background: var(--accent-color);
    color: var(--white);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.submit-btn {
    background: linear-gradient(135deg, var(--success), #34CE57);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.habits-list {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.habits-list h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.habits-container {
    display: grid;
    gap: 1rem;
}

.habit-item {
    background: var(--light-gray);
    border-radius: 8px;
    padding: 1rem;
    border-left: 4px solid var(--accent-color);
    transition: var(--transition);
}

.habit-item:hover {
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.habit-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.habit-name {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1rem;
}

.habit-type {
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
}

.habit-type.positivo {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success);
}

.habit-type.negativo {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger);
}

.habit-type.neutro {
    background: rgba(108, 117, 125, 0.1);
    color: var(--gray);
}

.habit-details {
    display: grid;
    gap: 0.25rem;
    font-size: 0.85rem;
    color: var(--gray);
}

.habit-actions {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
}

.habit-btn {
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.edit-btn {
    background: var(--warning);
    color: var(--dark-gray);
}

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

.habit-btn:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

.analysis-controls {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.analysis-controls select {
    flex: 1;
    padding: 0.5rem;
    border: 2px solid var(--lightest);
    border-radius: 6px;
}

.update-btn {
    background: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.analysis-grid {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.analysis-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

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

.analysis-card canvas {
    width: 100%;
    height: auto;
    max-height: 200px;
}

.patterns-list {
    display: grid;
    gap: 0.75rem;
}

.pattern-item {
    background: var(--light-gray);
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.intensity-display {
    text-align: center;
}

.intensity-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
}

.intensity-label {
    color: var(--gray);
    font-size: 0.85rem;
}

.insights-section {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

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

.insights-container {
    display: grid;
    gap: 1rem;
}

.insight-item {
    background: linear-gradient(135deg, var(--lightest), rgba(144, 224, 239, 0.5));
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.insight-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.strategy-selector {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

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

.strategy-selector select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--lightest);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.generate-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
}

.strategies-container {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.strategy-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--accent-color);
}

.strategy-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.strategy-description {
    color: var(--gray);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.strategy-steps {
    background: var(--light-gray);
    border-radius: 6px;
    padding: 1rem;
}

.strategy-steps h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.strategy-steps ol {
    margin-left: 1rem;
}

.strategy-steps li {
    margin-bottom: 0.25rem;
    font-size: 0.85rem;
}

.replacement-habits {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

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

.replacement-container {
    display: grid;
    gap: 1rem;
}

.replacement-item {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.1), rgba(52, 206, 87, 0.05));
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--success);
}

.replacement-title {
    font-weight: 600;
    color: var(--success);
    margin-bottom: 0.5rem;
}

.progress-controls {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.add-btn {
    background: var(--success);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-entries {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.progress-entry {
    background: var(--light-gray);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid var(--success);
}

.progress-charts {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

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

.faq-section {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.faq-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.faq-container {
    display: grid;
    gap: 1rem;
}

.faq-item {
    border: 1px solid var(--lightest);
    border-radius: 8px;
    overflow: hidden;
}

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

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

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

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

.faq-icon {
    font-size: 1.2rem;
    transition: var(--transition);
}

.faq-answer {
    padding: 1rem;
    background: var(--white);
    border-top: 1px solid var(--lightest);
    animation: slideDown 0.3s ease;
}

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

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

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid var(--lightest);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

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

.nav-item:hover {
    background: var(--light-gray);
}

.nav-item.active {
    color: var(--accent-color);
    background: rgba(0, 119, 182, 0.1);
}

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

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 1rem;
    font-size: 0.8rem;
    margin-top: 2rem;
}

footer a {
    color: var(--lightest);
    text-decoration: none;
}

@media (min-width: 768px) {
    .app-main {
        padding: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
    
    .action-buttons {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .analysis-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .habits-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .strategies-container {
        grid-template-columns: repeat(1, 1fr);
    }
    
    .replacement-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .analysis-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .habits-container {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .replacement-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--gray);
}

.loading i {
    font-size: 2rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.error-message {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    border-left: 4px solid var(--danger);
}

.success-message {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    border-left: 4px solid var(--success);
}