/* CSS Variables */
:root {
    --primary-blue: #2196F3;
    --secondary-green: #4CAF50;
    --accent-yellow: #FFC107;
    --alert-red: #F44336;
    --support-purple: #9C27B0;
    --background: #f5f5f5;
    --surface: #ffffff;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border: #e0e0e0;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* 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-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    padding-bottom: 80px;
    overflow-x: hidden;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--support-purple));
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

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

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

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

/* Cards */
.welcome-card,
.summary-card,
.recommendation-card,
.cultural-article {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.welcome-card:hover,
.summary-card:hover,
.recommendation-card:hover {
    box-shadow: var(--shadow-hover);
}

/* Progress Overview */
.progress-overview {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.5rem;
    align-items: center;
}

.progress-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: conic-gradient(var(--primary-blue) 0deg, var(--border) 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.progress-circle::before {
    content: '';
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--surface);
    position: absolute;
}

.progress-text {
    font-weight: 700;
    font-size: 1rem;
    color: var(--primary-blue);
    z-index: 1;
}

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

.stat-item {
    text-align: center;
    padding: 0.5rem;
}

.stat-item i {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

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

.stat-item small {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Quick Actions */
.quick-actions {
    margin: 2rem 0;
}

.action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.action-btn {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
}

.action-btn:hover {
    border-color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.action-btn i {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #1976D2;
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: #616161;
}

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

.btn-danger:hover {
    background: #D32F2F;
}

.btn-complete {
    background: var(--secondary-green);
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.btn-complete:hover {
    background: #388E3C;
}

.btn-skip {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

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

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

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

/* Progress Filters */
.progress-filters {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.progress-filters select {
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    background: var(--surface);
    font-size: 1rem;
}

/* Skills Chart */
.skills-chart {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.skill-bar {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.skill-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-progress {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.skill-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-green));
    transition: width 0.8s ease;
}

.skill-score {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Progress List */
.progress-list,
.activity-list,
.speech-history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.progress-item,
.activity-item,
.speech-item {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-blue);
}

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

.progress-item-title {
    font-weight: 600;
    color: var(--text-primary);
}

.progress-item-score {
    background: var(--primary-blue);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.progress-item-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.progress-item-notes {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-style: italic;
}

/* Analysis Section */
.analysis-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.strengths-list,
.weaknesses-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.strength-item,
.weakness-item {
    padding: 0.5rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.strength-item {
    background: rgba(76, 175, 80, 0.1);
    color: var(--secondary-green);
    border-left: 3px solid var(--secondary-green);
}

.weakness-item {
    background: rgba(255, 193, 7, 0.1);
    color: #F57F17;
    border-left: 3px solid var(--accent-yellow);
}

.analysis-chart {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

#analysis-canvas {
    max-width: 100%;
    height: auto;
}

/* Recommendations */
.recommendation-categories {
    margin-bottom: 2rem;
}

.category-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border);
}

.tab-btn {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-blue);
    border-bottom-color: var(--primary-blue);
}

.recommendation-group {
    display: none;
}

.recommendation-group.active {
    display: block;
}

.recommendations-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.rec-header i {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

.rec-header h4 {
    flex: 1;
    margin: 0;
}

.difficulty {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty.easy {
    background: rgba(76, 175, 80, 0.2);
    color: var(--secondary-green);
}

.difficulty.medium {
    background: rgba(255, 193, 7, 0.2);
    color: #F57F17;
}

.difficulty.hard {
    background: rgba(244, 67, 54, 0.2);
    color: var(--alert-red);
}

.rec-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

/* Cultural Section */
.cultural-categories {
    margin-bottom: 2rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.cultural-category {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.cultural-category:hover,
.cultural-category.active {
    border-color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.05);
}

.cultural-category i {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

.cultural-articles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.cultural-article {
    cursor: pointer;
    transition: var(--transition);
}

.cultural-article:hover {
    transform: translateY(-2px);
}

.cultural-article h4 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.cultural-article p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.cultural-article .article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Speech Practice */
.speech-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.exercise-types {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.exercise-type {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 120px;
}

.exercise-type:hover,
.exercise-type.active {
    border-color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.05);
}

.exercise-type i {
    color: var(--primary-blue);
}

.current-exercise {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.exercise-text {
    background: var(--background);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    text-align: center;
}

.exercise-text p {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
}

.speech-controls-panel {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.speech-feedback {
    background: var(--background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 1rem;
}

.feedback-content {
    margin-top: 1rem;
}

.feedback-score {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.score-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: conic-gradient(var(--secondary-green) 0deg, var(--border) 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--secondary-green);
}

/* Quiz */
.quiz-container {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.quiz-question {
    margin-bottom: 2rem;
}

.quiz-options {
    display: grid;
    gap: 1rem;
}

.quiz-option {
    background: var(--background);
    border: 2px solid var(--border);
    padding: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.quiz-option:hover {
    border-color: var(--primary-blue);
}

.quiz-option.selected {
    border-color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

.quiz-option.correct {
    border-color: var(--secondary-green);
    background: rgba(76, 175, 80, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--alert-red);
    background: rgba(244, 67, 54, 0.1);
}

/* FAQ Section */
.faq-section {
    margin: 3rem 0;
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

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

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

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

.faq-question:hover {
    background: #eeeeee;
}

.faq-question[aria-expanded="true"] {
    background: var(--primary-blue);
    color: white;
}

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

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

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

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

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        padding-top: 0;
        padding-bottom: 0;
    }
    to {
        opacity: 1;
        max-height: 200px;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

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

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

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

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

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--background);
}

.modal-body {
    padding: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

.language-options {
    display: grid;
    gap: 1rem;
}

.language-option {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 1rem;
    text-align: left;
}

.language-option:hover {
    border-color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.05);
}

.language-option i {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

/* 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;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    z-index: 100;
}

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

.nav-item:hover,
.nav-item.active {
    color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

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

.nav-item span {
    font-size: 0.7rem;
    font-weight: 600;
}

/* Empty States */
.empty-state {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 2rem;
    background: var(--background);
    border-radius: var(--border-radius);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    background: var(--surface);
    margin-top: 3rem;
    border-top: 1px solid var(--border);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-main {
        padding: 0.5rem;
    }
    
    .progress-overview {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
    }
    
    .analysis-summary {
        grid-template-columns: 1fr;
    }
    
    .progress-filters {
        grid-template-columns: 1fr;
    }
    
    .speech-controls-panel {
        flex-direction: column;
    }
    
    .exercise-types {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cultural-articles {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 1rem;
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: 0.75rem;
    }
    
    .app-header h1 {
        font-size: 1.2rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .progress-item-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .progress-item-meta {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .rec-actions {
        flex-direction: column;
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .category-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        padding: 0.75rem 1rem;
        flex: 1;
        min-width: 100px;
    }
}

/* 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;
        --text-secondary: #000000;
        --shadow: 0 2px 8px rgba(0,0,0,0.3);
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #121212;
        --surface: #1e1e1e;
        --text-primary: #ffffff;
        --text-secondary: #aaaaaa;
        --border: #333333;
    }
    
    .faq-question:hover {
        background: #333333;
    }
}

/* Print styles */
@media print {
    .bottom-nav,
    .modal,
    .btn-primary,
    .btn-secondary,
    .btn-danger,
    .action-btn {
        display: none !important;
    }
    
    .app-section {
        display: block !important;
    }
    
    body {
        padding-bottom: 0;
    }
}