/**
 * Combobox Component Styles - Design Token Enhanced
 * 
 * Styling for the autocomplete combobox dropdown overlay.
 * Uses design tokens for consistent theming and easy customization.
 * Includes responsive design, accessibility features, and portal positioning.
 */

/* Combobox Theme Variables */
:root {
    --cb-border-radius: var(--radius-md, 0.375rem);
    --cb-border-radius-lg: var(--radius-lg, 0.5rem);
    --cb-shadow: var(--shadow-lg, 0 10px 15px -3px rgba(0, 0, 0, 0.1));
    --cb-z-index: var(--z-dropdown, 1050);
    --cb-transition: var(--transition-base, 0.15s ease-in-out);
    
    /* Colors */
    --cb-bg-primary: var(--color-bg-primary, #ffffff);
    --cb-border-color: var(--color-border, #dee2e6);
    --cb-text-primary: var(--color-text-primary, #212529);
    --cb-text-muted: var(--color-text-muted, #6c757d);
    
    /* Focus and Selection Colors */
    --cb-focus-color: var(--color-primary, #0d6efd);
    --cb-focus-shadow: rgba(var(--color-primary-rgb, 13, 110, 253), 0.25);
    --cb-highlight-bg: rgba(var(--color-primary-rgb, 13, 110, 253), 0.1);
    --cb-selected-bg: var(--color-primary, #0d6efd);
    --cb-selected-text: var(--color-text-white, #ffffff);
    
    /* Spacing */
    --cb-padding-sm: var(--space-sm, 0.5rem);
    --cb-padding-md: var(--space-md, 0.75rem);
    --cb-padding-lg: var(--space-lg, 1rem);
    
    /* Touch Targets */
    --cb-min-height-desktop: 44px;
    --cb-min-height-mobile: 48px;
}

/* Combobox input field styling - Issue #31 Task 10: Force light theme */
[data-combobox] input[role="combobox"] {
    cursor: pointer;
    background-color: #ffffff !important;
    position: relative;
    color: #212529 !important;
    transition: var(--cb-transition);
}

[data-combobox] input[role="combobox"]:focus {
    outline: 2px solid var(--cb-focus-color);
    outline-offset: -2px;
    box-shadow: 0 0 0 0.2rem var(--cb-focus-shadow);
}

/* Portal overlay container */
.cb-overlay {
    position: absolute;
    z-index: var(--cb-z-index);
    pointer-events: none; /* Only enable on listbox */
    top: 0;
    left: 0;
    width: auto;
    max-width: 90vw; /* Prevent overflow on small screens */
}

/* Listbox container */
.cb-overlay .cb-listbox {
    pointer-events: auto;
    /* max-height controlled dynamically by JavaScript */
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid var(--cb-border-color);
    border-radius: var(--cb-border-radius);
    box-shadow: var(--cb-shadow);
    background: var(--cb-bg-primary);
    font-family: inherit;
    font-size: var(--font-size-sm, 0.875rem);
    line-height: var(--line-height-normal, 1.5);
    color: var(--cb-text-primary);
}

/* Individual option styling */
.cb-overlay .cb-option {
    padding: var(--cb-padding-sm) var(--cb-padding-md);
    cursor: pointer;
    border-bottom: 1px solid rgba(var(--color-border-rgb, 222, 226, 230), 0.4);
    transition: var(--cb-transition);
    display: flex;
    align-items: center;
    min-height: var(--cb-min-height-desktop);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.cb-overlay .cb-option:last-child {
    border-bottom: none;
}

/* Hover state */
.cb-overlay .cb-option:hover {
    background-color: var(--cb-highlight-bg);
    color: var(--cb-text-primary);
}

/* Highlighted state (keyboard navigation) */
.cb-overlay .cb-option.cb-highlighted {
    background-color: var(--cb-highlight-bg);
    color: var(--cb-text-primary);
    outline: 2px solid var(--cb-focus-color);
    outline-offset: -2px;
}

/* Selected state */
.cb-overlay .cb-option[aria-selected="true"] {
    background-color: var(--cb-selected-bg);
    color: var(--cb-selected-text);
}

/* Empty state */
.cb-overlay .cb-option.cb-empty {
    color: var(--cb-text-muted);
    font-style: italic;
    cursor: default;
    background: var(--color-bg-subtle, #f8f9fa);
}

.cb-overlay .cb-option.cb-empty:hover {
    background: var(--color-bg-subtle, #f8f9fa);
}

/* Option title styling */
.cb-overlay .cb-title {
    font-weight: 500;
    flex: 1;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

/* Scrollbar styling for WebKit browsers */
.cb-overlay .cb-listbox::-webkit-scrollbar {
    width: 6px;
}

.cb-overlay .cb-listbox::-webkit-scrollbar-track {
    background: var(--bs-tertiary-bg, #f8f9fa);
}

.cb-overlay .cb-listbox::-webkit-scrollbar-thumb {
    background: var(--bs-secondary, #6c757d);
    border-radius: 3px;
}

.cb-overlay .cb-listbox::-webkit-scrollbar-thumb:hover {
    background: var(--bs-secondary-dark, #565e64);
}

/* Loading state (if needed for future enhancements) */
.cb-overlay .cb-loading {
    padding: 1rem;
    text-align: center;
    color: var(--bs-secondary, #6c757d);
    font-style: italic;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .cb-overlay .cb-listbox {
        border: 2px solid currentColor;
    }
    
    .cb-overlay .cb-option.cb-highlighted {
        outline: 2px solid currentColor;
        outline-offset: -2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .cb-overlay .cb-option {
        transition: none;
    }
}

/* Mobile responsive design */
@media (max-width: 768px) {
    .cb-overlay {
        max-width: 95vw;
        z-index: 10000 !important; /* Must be above cards (z-index: 1000) */
    }
    
    .cb-overlay .cb-listbox {
        /* max-height controlled dynamically by JavaScript */
        font-size: var(--font-size-base, 1rem); /* Larger text on mobile */
    }
    
    .cb-overlay .cb-option {
        padding: var(--cb-padding-md) var(--cb-padding-lg);
        min-height: var(--cb-min-height-mobile); /* Larger touch targets on mobile */
    }
    
    /* Ensure dropdown doesn't get cut off by soft keyboard */
    /* max-height controlled dynamically by JavaScript */
}

/* Issue #31 Task 10: Force light theme - Override system dark mode */
.cb-overlay .cb-listbox {
    background: #ffffff !important;
    border-color: #dee2e6 !important;
    color: #212529 !important;
}

.cb-overlay .cb-option {
    border-bottom-color: rgba(222, 226, 230, 0.4) !important;
    color: #212529 !important;
}

.cb-overlay .cb-option:hover {
    background-color: rgba(13, 110, 253, 0.1) !important;
    color: #212529 !important;
}

.cb-overlay .cb-option.cb-highlighted {
    background-color: rgba(13, 110, 253, 0.1) !important;
    color: #212529 !important;
}

/* Focus management for better accessibility */
[data-combobox] input[role="combobox"][aria-expanded="true"] {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

/* Teacher combobox specific styling */
:root {
    --cb-teacher-color: var(--color-success, #198754);
    --cb-teacher-shadow: rgba(var(--color-success-rgb, 25, 135, 84), 0.25);
    --cb-teacher-bg-subtle: var(--color-success-bg, #d1e7dd);
}

[data-teacher-combobox] input[role="combobox"] {
    cursor: text;
    background-color: var(--cb-bg-primary);
    position: relative;
    border-color: var(--cb-teacher-color);
    color: var(--cb-text-primary);
    transition: var(--cb-transition);
}

[data-teacher-combobox] input[role="combobox"]:focus {
    outline: 2px solid var(--cb-teacher-color);
    outline-offset: -2px;
    border-color: var(--cb-teacher-color);
    box-shadow: 0 0 0 0.2rem var(--cb-teacher-shadow);
}

/* Teacher-specific overlay styling */
.teacher-cb-overlay .cb-listbox {
    border-color: var(--cb-teacher-color);
    box-shadow: 
        var(--cb-shadow),
        0 0 0 1px var(--cb-teacher-shadow);
}

.teacher-cb-overlay .cb-option {
    min-height: 54px; /* Slightly larger for two-line teacher entries */
    padding: var(--cb-padding-md) var(--cb-padding-lg);
}

.teacher-cb-overlay .cb-option.cb-highlighted {
    background-color: var(--cb-teacher-bg-subtle);
    color: var(--cb-text-primary);
    outline: 2px solid var(--cb-teacher-color);
    outline-offset: -2px;
}

.teacher-cb-overlay .cb-option[aria-selected="true"] {
    background-color: var(--cb-teacher-color);
    color: var(--cb-selected-text);
}

/* Teacher option content styling */
.teacher-cb-overlay .cb-subtitle {
    font-size: var(--font-size-xs, 0.75rem);
    margin-top: var(--space-xs, 0.125rem);
    line-height: var(--line-height-tight, 1.3);
    color: var(--cb-text-muted);
}

.teacher-cb-overlay .cb-option.cb-loading,
.teacher-cb-overlay .cb-option.cb-error {
    justify-content: center;
    color: var(--cb-text-muted);
}

.teacher-cb-overlay .cb-option.cb-error {
    color: var(--color-warning, #ffc107);
}

/* Issue #31 Task 10: Teacher combobox light theme forced */
[data-teacher-combobox] input[role="combobox"] {
    background-color: #ffffff !important;
    color: #212529 !important;
}

.teacher-cb-overlay .cb-listbox {
    background: #ffffff !important;
    border-color: #198754 !important;
    color: #212529 !important;
}

.teacher-cb-overlay .cb-option {
    color: #212529 !important;
}

.teacher-cb-overlay .cb-option:hover {
    background-color: #d1e7dd !important;
    color: #212529 !important;
}

.teacher-cb-overlay .cb-option.cb-highlighted {
    background-color: #d1e7dd !important;
    color: #212529 !important;
}

/* Print styles */
@media print {
    .cb-overlay,
    .teacher-cb-overlay {
        display: none !important;
    }
}

/*
 * CUSTOMIZATION GUIDE
 * ===================
 * 
 * This combobox component is now fully integrated with the design token system.
 * For easy visual customization, override these CSS custom properties:
 * 
 * BASIC THEMING:
 * --------------
 * :root {
 *   --cb-bg-primary: #ffffff;              // Background color
 *   --cb-border-color: #dee2e6;            // Border color
 *   --cb-text-primary: #212529;            // Text color
 *   --cb-text-muted: #6c757d;              // Muted text color
 * }
 * 
 * INTERACTION COLORS:
 * -------------------
 * :root {
 *   --cb-focus-color: #0d6efd;             // Focus outline color
 *   --cb-highlight-bg: rgba(13, 110, 253, 0.1);  // Hover/highlight background
 *   --cb-selected-bg: #0d6efd;             // Selected option background
 *   --cb-selected-text: #ffffff;           // Selected option text
 * }
 * 
 * SPACING & SIZING:
 * -----------------
 * :root {
 *   --cb-padding-sm: 0.5rem;              // Small padding
 *   --cb-padding-md: 0.75rem;             // Medium padding
 *   --cb-padding-lg: 1rem;                // Large padding
 *   --cb-min-height-desktop: 44px;        // Touch target on desktop
 *   --cb-min-height-mobile: 48px;         // Touch target on mobile
 * }
 * 
 * TEACHER COMBOBOX VARIANT:
 * -------------------------
 * :root {
 *   --cb-teacher-color: #198754;          // Success/teacher theme color
 *   --cb-teacher-shadow: rgba(25, 135, 84, 0.25);  // Focus shadow
 *   --cb-teacher-bg-subtle: #d1e7dd;      // Subtle background
 * }
 * 
 * DARK MODE EXAMPLE:
 * ------------------
 * [data-theme="dark"] {
 *   --cb-bg-primary: #212529;
 *   --cb-border-color: #495057;
 *   --cb-text-primary: #f8f9fa;
 *   --cb-text-muted: #adb5bd;
 *   --cb-highlight-bg: rgba(13, 110, 253, 0.3);
 * }
 * 
 * CUSTOM BRAND COLORS:
 * --------------------
 * .combobox-brand-purple {
 *   --cb-focus-color: #6f42c1;
 *   --cb-selected-bg: #6f42c1;
 *   --cb-highlight-bg: rgba(111, 66, 193, 0.1);
 * }
 *
 * For more information see: docs/FRONTEND_ARCHITECTURE.md
 */