/**
 * Universal Header Styles - Complete & Organized Version
 * 
 * Professional header component for Aphasia Studio widgets with:
 * - Mobile-first responsive design
 * - Perfect icon centering
 * - Enhanced accessibility
 * - Consistent styling across all widgets
 * 
 * Version: 2.0
 * Last Updated: September 2025
 */

/* =====================================================================================
   CSS CUSTOM PROPERTIES
   ===================================================================================== */

:root {
    /* Colors */
    --header-primary: #3b82f6;
    --header-primary-hover: #2563eb;
    --header-secondary: #1d4ed8;
    --header-background: #f8fafc;
    --header-border: #e5e7eb;
    --header-border-light: #f1f5f9;
    --header-text-primary: #1f2937;
    --header-text-secondary: #6b7280;
    --header-text-muted: #9ca3af;
    --header-surface: #ffffff;
    --header-surface-hover: #f9fafb;
    --header-surface-active: #f3f4f6;
    
    /* Shadows */
    --header-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --header-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --header-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --header-shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.1);
    
    /* Spacing */
    --header-spacing-xs: 0.25rem;   /* 4px */
    --header-spacing-sm: 0.5rem;    /* 8px */
    --header-spacing-md: 1rem;      /* 16px */
    --header-spacing-lg: 1.5rem;    /* 24px */
    --header-spacing-xl: 2rem;      /* 32px */
    
    /* Border Radius */
    --header-radius-sm: 6px;
    --header-radius-md: 8px;
    --header-radius-lg: 12px;
    --header-radius-xl: 16px;
    
    /* Typography */
    --header-font-size-xs: 0.75rem;   /* 12px */
    --header-font-size-sm: 0.875rem;  /* 14px */
    --header-font-size-base: 1rem;    /* 16px */
    --header-font-size-lg: 1.125rem;  /* 18px */
    --header-font-size-xl: 1.25rem;   /* 20px */
    --header-font-size-2xl: 1.5rem;   /* 24px */
    --header-font-size-3xl: 1.875rem; /* 30px */
    --header-font-size-4xl: 2rem;     /* 32px */
    
    /* Animation */
    --header-transition: all 0.2s ease;
    --header-transition-slow: all 0.3s ease;
}

/* =====================================================================================
   MAIN HEADER CONTAINER
   ===================================================================================== */

.exercise-header-container {
    width: 100%;
    margin-bottom: var(--header-spacing-xl);
    position: relative;
    z-index: 10;
}

/* =====================================================================================
   HEADER BAR - Main Header Layout (3-Column Design)
   ===================================================================================== */

.exercise-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--header-spacing-lg);
    margin-bottom: var(--header-spacing-xl);
    padding-bottom: var(--header-spacing-md);
    border-bottom: 1px solid var(--header-border);
}

/* Left Side - Settings Button */
.exercise-header-left {
    display: flex;
    flex-direction: column;
    padding:0%;
    align-items: flex-start;
    justify-content: center;
}

/* Center - Exercise Info (Centered) */
.exercise-header-center {
    display: flex;
    flex-direction: column;
    gap: var(--header-spacing-xs);
    text-align: center;
    align-items: center;
}

.exercise-type {
    color: var(--header-text-secondary);
    font-size: var(--header-font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin: 0;
    line-height: 1.2;
}

.exercise-title {
    font-size: var(--header-font-size-4xl);
    font-weight: 600;
    margin: 0;
    color: var(--header-text-primary);
    line-height: 1.2;
}

/* Right Side - Progress Display */
.exercise-header-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--header-spacing-md);
}

/* =====================================================================================
   PROGRESS DISPLAY
   ===================================================================================== */

.header-progress {
    background: var(--header-surface-hover);
    padding: var(--header-spacing-sm) var(--header-spacing-md);
    border-radius: var(--header-radius-sm);
    font-size: var(--header-font-size-sm);
    color: var(--header-text-secondary);
    border: 1px solid var(--header-border);
    white-space: nowrap;
    font-weight: 500;
    display: flex;
    align-items: center;
    min-height: 44px; /* Match button height */
    box-sizing: border-box;
}

/* =====================================================================================
   SETTINGS TOGGLE BUTTON - PERFECTLY CENTERED
   ===================================================================================== */

.settings-toggle {
    /* Layout & Positioning */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    
    /* Perfect Square Dimensions */
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    
    /* Remove all padding/margin that could interfere */
    padding: 0;
    margin: 0;
    
    /* Styling */
    background: #3b82f6 !important;
    border: 1px solid var(--header-border);
    border-radius: 16px !important;
    cursor: pointer;
    
    /* Typography - Hide text, show icon via pseudo-element */
    font-size: 0;  /* Hide any text/emoji in HTML */
    font-weight: 500;
    color: var(--header-text-primary);
    line-height: 1;
    text-align: center;
    
    /* Interaction */
    transition: var(--header-transition);
    touch-action: manipulation;
    user-select: none;
    
    /* Prevent any text selection or highlighting */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    
    /* Box model */
    box-sizing: border-box;
}

/* Unicode Gear Icon */
.settings-toggle::before {
    content: '⚙';
    font-size: 26px;
    color: white;
    line-height: 1;
    display: block;
}

.settings-toggle::after {
    content: none;
}

/* Settings Toggle States */
.settings-toggle:hover {
    background: var(--header-border);
    border-color: var(--header-text-muted);
    transform: translateY(-1px);
    box-shadow: var(--header-shadow-sm);
}

.settings-toggle:hover::before {
    color: var(--header-gray-700);
}

.settings-toggle:focus {
    outline: 2px solid var(--header-primary);
    outline-offset: 2px;
    border-color: var(--header-primary);
}

.settings-toggle:active {
    transform: translateY(0);
    box-shadow: none;
}

.settings-toggle.active {
    background: var(--header-primary);
    color: rgb(11, 11, 184);
    border-color: var(--header-primary);
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.2);
}

.settings-toggle.active::before {
    color: white;
}

.settings-toggle.active:hover {
    background: var(--header-primary-hover);
    border-color: var(--header-primary-hover);
}

/* =====================================================================================
   COLLAPSIBLE SETTINGS PANEL
   ===================================================================================== */

.exercise-settings-panel {
    background: var(--header-background);
    border: 1px solid var(--header-border);
    border-radius: var(--header-radius-md);
    padding: var(--header-spacing-lg);
    margin-bottom: var(--header-spacing-xl);
    transition: var(--header-transition-slow);
    animation: slideDown 0.3s ease-out;
    box-shadow: var(--header-shadow-sm);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 500px;
    }
}

/* =====================================================================================
   SETTINGS GRID & GROUPS
   ===================================================================================== */

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--header-spacing-md);
    align-items: start;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: var(--header-spacing-sm);
}

.setting-group label {
    font-size: var(--header-font-size-sm);
    font-weight: 600;
    color: var(--header-text-primary);
    margin: 0;
    line-height: 1.4;
}

/* =====================================================================================
   FORM CONTROLS
   ===================================================================================== */

/* Select Dropdowns */
.settings-select {
    padding: 0.75rem;
    border: 1px solid var(--header-border);
    border-radius: var(--header-radius-sm);
    font-size: var(--header-font-size-sm);
    background: var(--header-surface);
    color: var(--header-text-primary);
    transition: var(--header-transition);
    min-height: 44px;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

.settings-select:focus {
    outline: none;
    border-color: var(--header-primary);
    box-shadow: var(--header-shadow-focus);
}

.settings-select:hover {
    border-color: var(--header-text-muted);
    background-color: var(--header-surface-hover);
}

/* =====================================================================================
   CHECKBOX STYLES
   ===================================================================================== */

.settings-checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--header-spacing-sm);
    cursor: pointer;
    padding: 12px;
    background: var(--header-surface);
    border: 1px solid var(--header-border);
    border-radius: var(--header-radius-md);
    transition: var(--header-transition);
    min-height: 44px;
    user-select: none;
}

.settings-checkbox-label:hover {
    border-color: var(--header-text-muted);
    background: var(--header-surface-hover);
}

.settings-checkbox-label:focus-within {
    border-color: var(--header-primary);
    box-shadow: var(--header-shadow-focus);
}

.settings-checkbox {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--header-border);
    border-radius: 4px;
    background: var(--header-surface);
    cursor: pointer;
    position: relative;
    transition: var(--header-transition);
    flex-shrink: 0;
    margin: 0;
}

.settings-checkbox:checked {
    background: var(--header-primary);
    border-color: var(--header-primary);
}

.settings-checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: -2px;
    left: 1px;
    color: var(--header-surface);
    font-size: 12px;
    font-weight: bold;
    line-height: 1;
}

.settings-checkbox:focus {
    outline: 2px solid var(--header-primary);
    outline-offset: 2px;
}

.checkbox-text {
    font-size: var(--header-font-size-sm);
    color: var(--header-text-primary);
    font-weight: 500;
    line-height: 1.4;
}

/* =====================================================================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ===================================================================================== */

/* Tablet Breakpoint - 768px and below */
@media (max-width: 768px) {
    .exercise-header {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: var(--header-spacing-md);
    }
    
    /* On mobile, settings button moves to top-left */
    .exercise-header-left {
        grid-row: 1;
        align-self: start;
    }
    
    /* Title stays centered */
    .exercise-header-center {
        grid-row: 2;
        text-align: center;
    }
    
    .exercise-title {
        font-size: var(--header-font-size-3xl);
    }
    
    /* Progress moves to bottom */
    .exercise-header-right {
        grid-row: 3;
        justify-content: center;
        width: 100%;
    }
    
    .header-progress {
        flex: 1;
        text-align: center;
        justify-content: center;
    }
    
    .settings-toggle {
        width: 46px;
        height: 46px;
        min-width: 46px;
        min-height: 46px;
        font-size: var(--header-font-size-xl);
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
        gap: var(--header-spacing-lg);
    }
    
    .exercise-settings-panel {
        padding: var(--header-spacing-md);
    }
}

/* Mobile Breakpoint - 480px and below */
@media (max-width: 480px) {
    .exercise-header-container {
        margin-bottom: var(--header-spacing-lg);
    }
    
    .exercise-header {
        gap: var(--header-spacing-md);
        margin-bottom: var(--header-spacing-lg);
        padding-bottom: var(--header-spacing-md);
    }
    
    .exercise-title {
        font-size: var(--header-font-size-2xl);
        line-height: 1.3;
    }
    
    .exercise-type {
        font-size: var(--header-font-size-xs);
    }
    
    .header-progress {
        text-align: center;
        padding: 0.75rem var(--header-spacing-md);
        font-size: var(--header-font-size-xs);
    }
    
    .settings-toggle {
        width: 48px;
        height: 48px;
        min-width: 48px;
        min-height: 48px;
        font-size: var(--header-font-size-xl);
    }
    
    .exercise-settings-panel {
        padding: var(--header-spacing-md);
        border-radius: var(--header-radius-sm);
    }
    
    .settings-grid {
        gap: var(--header-spacing-md);
    }
    
    .settings-select {
        padding: var(--header-spacing-md) 0.75rem;
        font-size: var(--header-font-size-base);
        min-height: 48px;
        padding-right: 2.5rem;
    }
    
    .setting-group label {
        font-size: var(--header-font-size-base);
        margin-bottom: var(--header-spacing-sm);
    }
    
    .settings-checkbox-label {
        padding: 16px;
        min-height: 48px;
    }
    
    .settings-checkbox {
        width: 20px;
        height: 20px;
    }
    
    .checkbox-text {
        font-size: var(--header-font-size-base);
    }
}

/* Extra Small Screens - 360px and below */
@media (max-width: 360px) {
    .exercise-title {
        font-size: var(--header-font-size-xl);
    }
    
    .exercise-header-right {
        gap: var(--header-spacing-sm);
    }
    
    .settings-toggle {
        width: 44px;
        height: 44px;
        min-width: 44px;
        min-height: 44px;
        font-size: var(--header-font-size-lg);
    }
    
    .header-progress {
        font-size: var(--header-font-size-xs);
        padding: var(--header-spacing-sm) 0.75rem;
    }
    
    .exercise-settings-panel {
        padding: 0.75rem;
    }
}

/* =====================================================================================
   MOBILE HEADER LAYOUT ADJUSTMENTS - SFA & ALL WIDGETS
   ===================================================================================== */

@media (max-width: 768px) {
    /* Hide question count/progress on mobile */
    .exercise-header-right,
    .header-progress {
        display: none !important;
    }
    
    /* Change header to 2-column layout: title + settings */
    .exercise-header {
        grid-template-columns: 1fr auto;
        grid-template-rows: auto;
        gap: var(--header-spacing-md);
        align-items: center;
    }
    
    /* Title section - left aligned, takes most space */
    .exercise-header-center {
        grid-column: 1;
        grid-row: 1;
        text-align: left;
        align-items: flex-start;
    }
    
    /* Smaller title on mobile */
    .exercise-title {
        font-size: var(--header-font-size-xl) !important; /* 20px */
        line-height: 1.3;
    }
    
    /* Settings button - right side, same row as title */
    .exercise-header-left {
        grid-column: 2;
        grid-row: 1;
        align-self: center;
    }
    
    .settings-toggle {
        width: 40px !important;
        height: 40px !important;
        min-width: 40px !important;
        min-height: 40px !important;
        font-size: 24px !important;
    }
}

@media (max-width: 480px) {
    /* Even smaller title on small mobile */
    .exercise-title {
        font-size: var(--header-font-size-lg) !important; /* 18px */
    }
    
    .exercise-type {
        font-size: 10px;
    }
    
    .settings-toggle {
        width: 36px !important;
        height: 36px !important;
        min-width: 36px !important;
        min-height: 36px !important;
        font-size: 20px !important;
    }
}

@media (max-width: 360px) {
    .exercise-title {
        font-size: var(--header-font-size-base) !important; /* 16px */
    }
    
    .exercise-header {
        gap: var(--header-spacing-sm);
    }
}

/* =====================================================================================
   ACCESSIBILITY ENHANCEMENTS
   ===================================================================================== */

/* Focus Indicators */
*:focus {
    outline-color: var(--header-primary);
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .exercise-header {
        border-bottom-width: 2px;
        border-bottom-color: #000;
    }
    
    .settings-toggle {
        border-width: 2px;
    }
    
    .settings-select {
        border-width: 2px;
    }
    
    .settings-checkbox {
        border-width: 3px;
    }
    
    .exercise-settings-panel {
        border-width: 2px;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .exercise-settings-panel {
        animation: none;
        transition: none;
    }
    
    .settings-toggle,
    .settings-select,
    .settings-checkbox-label,
    .settings-checkbox {
        transition: none;
    }
    
    @keyframes slideDown {
        from { opacity: 0; }
        to { opacity: 1; }
    }
}

/* =====================================================================================
   INTEGRATION WITH EXISTING WIDGET STYLES
   ===================================================================================== */

/* Ensure compatibility with flashcard widget */
.flashcard-exercise-root .exercise-header-container {
    width: 100%;
    margin-bottom: var(--header-spacing-xl);
}

.flashcard-exercise-root .exercise-header {
    margin-bottom: 0;
    padding-bottom: var(--header-spacing-md);
    border-bottom: 1px solid var(--header-border);
}

/* Ensure compatibility with category widget */
.category-exercise-root .exercise-header-container {
    width: 100%;
    margin-bottom: var(--header-spacing-xl);
}

/* Ensure compatibility with other widgets */
.widget-container .exercise-header-container {
    width: 100%;
    margin-bottom: var(--header-spacing-xl);
}

/* Root container adjustments for mobile */
@media (max-width: 480px) {
    .flashcard-exercise-root,
    .category-exercise-root,
    .widget-container {
        margin: var(--header-spacing-md);
        padding: var(--header-spacing-md);
        border-radius: var(--header-radius-md);
    }
}

@media (max-width: 360px) {
    .flashcard-exercise-root,
    .category-exercise-root,
    .widget-container {
        margin: var(--header-spacing-sm);
        padding: 0.75rem;
    }
}

/* =====================================================================================
   DEBUGGING UTILITIES (REMOVE IN PRODUCTION)
   ===================================================================================== */

/* Uncomment for debugging layout issues */
/*
.debug .settings-toggle {
    border: 2px solid red !important;
    background: rgba(255, 0, 0, 0.1) !important;
}

.debug .settings-toggle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 2px;
    background: red;
    transform: translate(-50%, -50%);
    z-index: 1000;
}

.debug .exercise-header-right {
    border: 1px dashed blue;
}

.debug .header-progress {
    border: 1px dashed green;
}
*/

/* =====================================================================================
   PRINT STYLES
   ===================================================================================== */

@media print {
    .exercise-header-container {
        margin-bottom: 1rem;
    }
    
    .exercise-settings-panel {
        display: none;
    }
    
    .settings-toggle {
        display: none;
    }
    
    .exercise-header {
        border-bottom: 2px solid #000;
        padding-bottom: 0.5rem;
    }
    
    .exercise-title {
        color: #000;
    }
    
    .exercise-type {
        color: #333;
    }
}