/**
 * AutoComplete Base Styles
 *
 * Contains structural and layout styles that are theme-independent.
 * These styles define the component's box model, positioning, and
 * core functionality (dropdown, virtualization, keyboard focus).
 *
 * Do not include colors, fonts, or theme-specific properties here.
 * All design tokens (colors, spacing, typography) are defined as CSS
 * custom properties and can be overridden by theme files.
 */

/* ===== CSS VARIABLE DECLARATIONS (defaults, overridden by themes) ===== */
:root {
    /* Colors - default neutral values */
    --ebd-ac-primary: #3b82f6;
    --ebd-ac-bg: #ffffff;
    --ebd-ac-text: #1f2937;
    --ebd-ac-text-secondary: #6b7280;
    --ebd-ac-border: #d1d5db;
    --ebd-ac-border-focus: var(--ebd-ac-primary);
    --ebd-ac-hover: #f3f4f6;
    --ebd-ac-selected: #eff6ff;
    --ebd-ac-selected-text: var(--ebd-ac-primary);
    --ebd-ac-disabled: #9ca3af;
    --ebd-ac-error: #dc2626;
    --ebd-ac-shadow: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --ebd-ac-input-padding: 8px 32px 8px 12px;
    --ebd-ac-item-padding: 8px 12px;
    --ebd-ac-border-radius: 6px;
    --ebd-ac-dropdown-gap: 4px;
    --ebd-ac-dropdown-max-height: 300px;
    --ebd-ac-list-padding: 4px 0;
    --ebd-ac-group-padding: 8px 12px;
    --ebd-ac-icon-size: 20px;

    /* Typography */
    --ebd-ac-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --ebd-ac-font-size: 14px;
    --ebd-ac-line-height: 1.5;
    --ebd-ac-font-weight: 400;
    --ebd-ac-group-font-size: 12px;
    --ebd-ac-letter-spacing: normal;

    /* Effects */
    --ebd-ac-focus-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    --ebd-ac-dropdown-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    --ebd-ac-transition-duration: 0.2s;
    --ebd-ac-transition-timing: ease;
}

/* ===== CONTAINER ===== */
.ebd-ac-container {
    position: relative;
    width: 100%;
    font-family: var(--ebd-ac-font-family);
    font-size: var(--ebd-ac-font-size);
}

/* ===== INPUT WRAPPER ===== */
.ebd-ac-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

/* ===== INPUT FIELD ===== */
.ebd-ac-input {
    width: 100%;
    padding: var(--ebd-ac-input-padding);
    border: 1px solid var(--ebd-ac-border);
    border-radius: var(--ebd-ac-border-radius);
    background-color: var(--ebd-ac-bg);
    color: var(--ebd-ac-text);
    font-size: var(--ebd-ac-font-size);
    line-height: var(--ebd-ac-line-height);
    transition: border-color var(--ebd-ac-transition-duration) var(--ebd-ac-transition-timing),
                box-shadow var(--ebd-ac-transition-duration) var(--ebd-ac-transition-timing);
    outline: none;
}

.ebd-ac-input:focus {
    border-color: var(--ebd-ac-border-focus);
    box-shadow: var(--ebd-ac-focus-shadow);
}

.ebd-ac-input:disabled {
    background-color: var(--ebd-ac-hover);
    color: var(--ebd-ac-disabled);
    cursor: not-allowed;
}

.ebd-ac-input::placeholder {
    color: var(--ebd-ac-disabled);
}

/* ===== CLEAR BUTTON ===== */
.ebd-ac-clear-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--ebd-ac-disabled);
    font-size: var(--ebd-ac-icon-size);
    line-height: 1;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--ebd-ac-icon-size);
    height: var(--ebd-ac-icon-size);
    transition: color var(--ebd-ac-transition-duration) var(--ebd-ac-transition-timing);
}

.ebd-ac-clear-btn:hover {
    color: var(--ebd-ac-text);
}

/* ===== DROPDOWN ===== */
.ebd-ac-dropdown {
    position: absolute;
    top: calc(100% + var(--ebd-ac-dropdown-gap));
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--ebd-ac-bg);
    border: 1px solid var(--ebd-ac-border);
    border-radius: var(--ebd-ac-border-radius);
    box-shadow: var(--ebd-ac-dropdown-shadow);
    max-height: var(--ebd-ac-dropdown-max-height);
    overflow-y: auto;
    overflow-x: hidden;
}

/* ===== LIST ===== */
.ebd-ac-list {
    list-style: none;
    margin: 0;
    padding: var(--ebd-ac-list-padding);
}

/* ===== ITEMS ===== */
.ebd-ac-item {
    padding: var(--ebd-ac-item-padding);
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
    color: var(--ebd-ac-text);
    border-left: 3px solid transparent;
}

.ebd-ac-item:hover {
    background-color: var(--ebd-ac-hover);
}

.ebd-ac-item.selected {
    background-color: var(--ebd-ac-selected);
    color: var(--ebd-ac-selected-text);
    font-weight: 500;
}

.ebd-ac-item.keyboard-selected {
    background: var(--ebd-ac-hover);
    border-left-color: var(--ebd-ac-primary);
    font-weight: 500;
}

/* ===== NO RESULTS ===== */
.ebd-ac-no-results {
    padding: 16px 12px;
    text-align: center;
    color: var(--ebd-ac-disabled);
    font-style: italic;
}

/* ===== GROUPING ===== */
.ebd-ac-group {
    margin-bottom: 4px;
    list-style: none;
}

.ebd-ac-group:last-child {
    margin-bottom: 0;
}

.ebd-ac-group-header {
    padding: var(--ebd-ac-group-padding);
    background-color: var(--ebd-ac-hover);
    color: var(--ebd-ac-text);
    font-weight: 600;
    font-size: var(--ebd-ac-group-font-size);
    text-transform: uppercase;
    letter-spacing: var(--ebd-ac-letter-spacing);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--ebd-ac-border);
}

.ebd-ac-group-count {
    font-weight: 400;
    color: var(--ebd-ac-disabled);
    font-size: 11px;
}

/* Items within groups should not have extra padding */
.ebd-ac-group .ebd-ac-item:first-of-type {
    margin-top: 0;
}

/* ===== LOADING & VIRTUALIZATION ===== */
.ebd-ac-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--ebd-ac-hover);
    opacity: 0.5;
}

.ebd-ac-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 12px;
    color: var(--ebd-ac-disabled);
    font-size: var(--ebd-ac-font-size);
    gap: 12px;
}

.ebd-ac-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--ebd-ac-border);
    border-top-color: var(--ebd-ac-border-focus);
    border-radius: 50%;
    animation: ebd-ac-spin 0.8s linear infinite;
}

@keyframes ebd-ac-spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* ===== BUILT-IN DISPLAY MODES ===== */

/* Title with Description */
.ebd-ac-title-desc {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ebd-ac-title-desc .ebd-ac-title {
    font-weight: 500;
    color: var(--ebd-ac-text);
}

.ebd-ac-title-desc .ebd-ac-description {
    font-size: 12px;
    line-height: 1.4;
    color: var(--ebd-ac-text-secondary);
}

/* Title with Badge */
.ebd-ac-title-badge {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.ebd-ac-title-badge .ebd-ac-title {
    flex: 1;
    font-weight: 500;
    color: var(--ebd-ac-text);
}

.ebd-ac-title-badge .ebd-ac-badge {
    flex-shrink: 0;
}

/* Title + Description + Badge */
.ebd-ac-title-desc-badge {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
}

.ebd-ac-title-desc-badge .ebd-ac-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ebd-ac-title-desc-badge .ebd-ac-title {
    font-weight: 500;
    color: var(--ebd-ac-text);
}

.ebd-ac-title-desc-badge .ebd-ac-description {
    font-size: 12px;
    line-height: 1.4;
    color: var(--ebd-ac-text-secondary);
}

.ebd-ac-title-desc-badge .ebd-ac-badge {
    flex-shrink: 0;
    margin-top: 2px;
}

/* Icon with Title */
.ebd-ac-icon-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ebd-ac-icon-title .ebd-ac-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.ebd-ac-icon-title .ebd-ac-title {
    flex: 1;
    font-weight: 500;
    color: var(--ebd-ac-text);
}

/* Icon + Title + Description */
.ebd-ac-icon-title-desc {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.ebd-ac-icon-title-desc .ebd-ac-icon {
    font-size: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

.ebd-ac-icon-title-desc .ebd-ac-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ebd-ac-icon-title-desc .ebd-ac-title {
    font-weight: 500;
    color: var(--ebd-ac-text);
}

.ebd-ac-icon-title-desc .ebd-ac-description {
    font-size: 12px;
    line-height: 1.4;
    color: var(--ebd-ac-text-secondary);
}

/* Card Mode */
.ebd-ac-card {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 4px 0;
}

.ebd-ac-card .ebd-ac-icon {
    font-size: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.ebd-ac-card .ebd-ac-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ebd-ac-card .ebd-ac-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.ebd-ac-card .ebd-ac-title {
    font-weight: 600;
    color: var(--ebd-ac-text);
}

.ebd-ac-card .ebd-ac-badge {
    flex-shrink: 0;
}

.ebd-ac-card .ebd-ac-subtitle {
    font-size: 13px;
    line-height: 1.4;
    color: var(--ebd-ac-text-secondary);
}

.ebd-ac-card .ebd-ac-description {
    font-size: 12px;
    line-height: 1.4;
    color: var(--ebd-ac-text-secondary);
}

/* Common Badge Styles */
.ebd-ac-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.4;
}

/* ===== RTL SUPPORT ===== */
.ebd-ac-container[dir="rtl"] .ebd-ac-input {
    padding: 8px 12px 8px 32px;
}

.ebd-ac-container[dir="rtl"] .ebd-ac-clear-btn {
    right: auto;
    left: 8px;
}

/* ===== SCROLLBAR STYLING ===== */
.ebd-ac-dropdown::-webkit-scrollbar {
    width: 8px;
}

.ebd-ac-dropdown::-webkit-scrollbar-track {
    background: var(--ebd-ac-bg);
}

.ebd-ac-dropdown::-webkit-scrollbar-thumb {
    background: var(--ebd-ac-border);
    border-radius: 4px;
}

.ebd-ac-dropdown::-webkit-scrollbar-thumb:hover {
    background: var(--ebd-ac-disabled);
}

/* ===== SIZE VARIANTS ===== */

/* Default size (base values, can be overridden) */
.ebd-ac-size-default {
    --ebd-ac-input-padding: 8px 32px 8px 12px;
    --ebd-ac-item-padding: 8px 12px;
    --ebd-ac-font-size: 14px;
    --ebd-ac-icon-size: 20px;
    --ebd-ac-border-radius: 6px;
}

/* Compact size (25% reduced spacing) */
.ebd-ac-size-compact {
    --ebd-ac-input-padding: 4px 24px 4px 8px;
    --ebd-ac-item-padding: 4px 8px;
    --ebd-ac-font-size: 13px;
    --ebd-ac-icon-size: 16px;
    --ebd-ac-border-radius: 3px;
    --ebd-ac-dropdown-gap: 2px;
    --ebd-ac-list-padding: 2px 0;
    --ebd-ac-group-padding: 4px 8px;
}

/* Large size (25% increased spacing) */
.ebd-ac-size-large {
    --ebd-ac-input-padding: 12px 40px 12px 16px;
    --ebd-ac-item-padding: 12px 16px;
    --ebd-ac-font-size: 16px;
    --ebd-ac-icon-size: 24px;
    --ebd-ac-border-radius: 8px;
    --ebd-ac-dropdown-gap: 6px;
    --ebd-ac-list-padding: 6px 0;
    --ebd-ac-group-padding: 12px 16px;
}

/* ===== THEME TRANSITIONS ===== */

/* Smooth transitions when theme changes */
.ebd-ac-theme-transitions,
.ebd-ac-theme-transitions * {
    transition:
        background-color var(--ebd-ac-transition-duration, 0.2s) var(--ebd-ac-transition-timing, ease),
        color var(--ebd-ac-transition-duration, 0.2s) var(--ebd-ac-transition-timing, ease),
        border-color var(--ebd-ac-transition-duration, 0.2s) var(--ebd-ac-transition-timing, ease),
        box-shadow var(--ebd-ac-transition-duration, 0.2s) var(--ebd-ac-transition-timing, ease);
}

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

/* Screen reader only - visually hidden but accessible to screen readers */
.sr-only,
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border-width: 0 !important;
}

/* Focus visible - show prominent focus ring only for keyboard navigation */
.ebd-ac-input:focus-visible {
    outline: 2px solid var(--ebd-ac-primary);
    outline-offset: 2px;
}

.ebd-ac-input:focus:not(:focus-visible) {
    outline: none;
}

/* Invalid state styling */
.ebd-ac-invalid .ebd-ac-input,
.ebd-ac-input.ebd-ac-invalid {
    border-color: var(--ebd-ac-error) !important;
    background-color: rgba(220, 38, 38, 0.05);
}

.ebd-ac-invalid .ebd-ac-input:focus,
.ebd-ac-input.ebd-ac-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.ebd-ac-error-messages {
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--ebd-ac-error);
}

.ebd-ac-error-message {
    display: block;
    margin-top: 0.25rem;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .ebd-ac-input {
        border-width: 2px;
    }

    .ebd-ac-item.keyboard-selected {
        font-weight: 600;
    }

    .ebd-ac-invalid .ebd-ac-input,
    .ebd-ac-input.ebd-ac-invalid {
        border-width: 3px;
    }
}

/* Reduced motion support - disables transitions */
@media (prefers-reduced-motion: reduce) {
    .ebd-ac-input,
    .ebd-ac-clear-btn,
    .ebd-ac-item,
    .ebd-ac-spinner,
    .ebd-ac-theme-transitions,
    .ebd-ac-theme-transitions * {
        transition: none !important;
        animation: none !important;
    }
}

/* Firefox scrollbar styling */
.ebd-ac-dropdown {
    scrollbar-width: thin;
    scrollbar-color: var(--ebd-ac-border) var(--ebd-ac-bg);
}