/* ===================================
   ACT Therapy Learning Platform Styles
   Mental Health-Friendly Design
   =================================== */

/* CSS Variables - Calming Color Palette */
:root {
    --primary-color: #6B9BD1;        /* Soft blue */
    --primary-dark: #5A8AC0;
    --secondary-color: #7FB685;       /* Soft green */
    --secondary-dark: #6FA575;
    --accent-color: #A8C5DD;          /* Light blue */
    --background: #F5F8FA;            /* Very light blue-gray */
    --surface: #FFFFFF;
    --text-primary: #2C3E50;
    --text-secondary: #5D6D7E;
    --text-light: #95A5A6;
    --border-color: #E1E8ED;
    --success: #7FB685;
    --warning: #F4A261;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 600;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

li {
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   Navigation
   =================================== */

.main-nav {
    background-color: var(--surface);
    box-shadow: 0 2px 8px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    margin: 0;
}

.nav-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-link:hover {
    background-color: var(--accent-color);
    color: var(--primary-dark);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: var(--surface);
}

/* ===================================
   Main Content
   =================================== */

.main-content {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.content-section {
    display: none;
    animation: fadeIn var(--transition-base);
}

.content-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: var(--spacing-xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    font-family: var(--font-primary);
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

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

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

/* ===================================
   Dashboard/Home Section
   =================================== */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.dashboard-card {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
    transition: all var(--transition-base);
    text-align: center;
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-hover);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.dashboard-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.dashboard-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.welcome-info {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.welcome-info h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   Flashcards Section
   =================================== */

.flashcard-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-weight: 500;
    color: var(--text-secondary);
}

.filter-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    background-color: var(--surface);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.card-counter {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.flashcard-viewer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    min-height: 400px;
}

.nav-btn {
    background-color: var(--primary-color);
    color: var(--surface);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.nav-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.1);
}

.nav-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    transform: scale(1);
}

.flashcard-container {
    perspective: 1000px;
    width: 100%;
    max-width: 600px;
}

.flashcard {
    width: 100%;
    height: 400px;
    cursor: pointer;
    position: relative;
}

.flashcard-inner {
    width: 100%;
    height: 100%;
    transition: transform var(--transition-slow);
    transform-style: preserve-3d;
    position: relative;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 16px var(--shadow);
}

.flashcard-front {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--surface);
}

.flashcard-back {
    background-color: var(--surface);
    transform: rotateY(180deg);
    overflow-y: auto;
}

.card-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.flip-hint {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: var(--spacing-md);
}

.card-content {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.card-context {
    background-color: var(--background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    text-align: left;
    width: 100%;
}

.card-context strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.card-context p {
    color: var(--text-secondary);
    margin: 0;
}

.flashcard-list {
    margin-top: var(--spacing-xl);
}

.flashcard-list h3 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.card-grid-item {
    background-color: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px var(--shadow);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.card-grid-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--shadow-hover);
    border-color: var(--primary-color);
}

.card-grid-item.reviewed {
    border-color: var(--success);
    background-color: rgba(127, 182, 133, 0.1);
}

.card-grid-item .card-number {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.card-grid-item .card-title-small {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.card-grid-item .card-category-small {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.card-grid-item .reviewed-badge {
    display: inline-block;
    margin-top: var(--spacing-xs);
    padding: 2px 8px;
    background-color: var(--success);
    color: var(--surface);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

/* ===================================
   Psychoeducation Section
   =================================== */

.concept-modules {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.concept-module {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.concept-module h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.75rem;
}

.concept-module > p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.concept-details {
    margin-top: var(--spacing-md);
}

.concept-details h4 {
    color: var(--text-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.concept-details ul {
    background-color: var(--background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.concept-details li {
    color: var(--text-secondary);
}

.exercise-box {
    background: linear-gradient(135deg, rgba(107, 155, 209, 0.1), rgba(168, 197, 221, 0.1));
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    margin-top: var(--spacing-md);
}

.exercise-box p strong {
    color: var(--primary-color);
    font-size: 1.125rem;
}

.exercise-box ol {
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.exercise-box li {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   Journal Section
   =================================== */

.journal-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.journal-editor {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.journal-controls {
    margin-bottom: var(--spacing-md);
}

.journal-title-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: 600;
    font-family: var(--font-primary);
    margin-bottom: var(--spacing-sm);
    transition: border-color var(--transition-fast);
}

.journal-title-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.journal-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.journal-textarea {
    width: 100%;
    min-height: 400px;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    line-height: 1.8;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.journal-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.journal-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.save-message {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 500;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.save-message.show {
    opacity: 1;
}

.save-message.success {
    background-color: rgba(127, 182, 133, 0.2);
    color: var(--success);
}

.journal-sidebar {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
    max-height: 600px;
    overflow-y: auto;
}

.journal-sidebar h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    position: sticky;
    top: 0;
    background-color: var(--surface);
    padding-bottom: var(--spacing-sm);
}

.journal-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.journal-entry-item {
    padding: var(--spacing-sm);
    background-color: var(--background);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.journal-entry-item:hover {
    background-color: var(--accent-color);
    border-color: var(--primary-color);
}

.journal-entry-item .entry-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.journal-entry-item .entry-date {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.journal-entry-item .entry-preview {
    font-size: 0.875rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.journal-entry-item .entry-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
}

.journal-entry-item .entry-action-btn {
    padding: 2px 8px;
    font-size: 0.75rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.entry-action-btn.delete {
    background-color: var(--warning);
    color: var(--surface);
}

.entry-action-btn.delete:hover {
    background-color: #E38B4F;
}

.no-entries {
    text-align: center;
    color: var(--text-light);
    padding: var(--spacing-lg);
}

/* ===================================
   Progress Section
   =================================== */

.progress-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.progress-stat {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
    text-align: center;
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1rem;
}

.progress-bar-container {
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    width: 100%;
    height: 30px;
    background-color: var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: inset 0 2px 4px var(--shadow);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--surface);
    font-weight: 600;
}

.category-progress {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: var(--spacing-xl);
}

.category-progress h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.category-breakdown {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.category-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-name {
    font-weight: 600;
    color: var(--text-primary);
}

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

.category-bar {
    height: 20px;
    background-color: var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.category-bar-fill {
    height: 100%;
    background-color: var(--secondary-color);
    transition: width var(--transition-base);
}

.reviewed-cards {
    background-color: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: var(--spacing-xl);
}

.reviewed-cards h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.reviewed-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

.reviewed-item {
    padding: var(--spacing-sm);
    background-color: var(--background);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--success);
}

.reviewed-item .item-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.reviewed-item .item-category {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.progress-actions {
    text-align: center;
}

/* ===================================
   Footer
   =================================== */

.main-footer {
    background-color: var(--surface);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    box-shadow: 0 -2px 8px var(--shadow);
    text-align: center;
}

.main-footer p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer-note {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    :root {
        --font-size-base: 14px;
    }
    
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .flashcard-viewer {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .flashcard {
        height: 350px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .journal-container {
        grid-template-columns: 1fr;
    }
    
    .journal-sidebar {
        order: -1;
        max-height: 300px;
    }
    
    .progress-overview {
        grid-template-columns: 1fr;
    }
    
    .reviewed-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-menu {
        gap: var(--spacing-xs);
    }
    
    .nav-link {
        padding: var(--spacing-xs);
        font-size: 0.875rem;
    }
    
    .flashcard {
        height: 300px;
    }
    
    .flashcard-front,
    .flashcard-back {
        padding: var(--spacing-md);
    }
    
    .card-title {
        font-size: 1.5rem;
    }
    
    .nav-btn {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
    
    .journal-textarea {
        min-height: 300px;
    }
}

/* ===================================
   Accessibility
   =================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0056b3;
        --text-primary: #000000;
        --background: #FFFFFF;
    }
}

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

/* Print styles */
@media print {
    .main-nav,
    .main-footer,
    .btn,
    .nav-btn {
        display: none;
    }
    
    .content-section {
        display: block !important;
    }
    
    body {
        background-color: white;
    }
}