/**
 * ChessStake - Language Selector Premium UI
 * Modal with 30+ languages, search, and region grouping
 */

/* ============================================
   FALLBACK VARIABLES FOR COMPATIBILITY
   Uses generic variables (--surface, --border, etc.) that each
   page's CSS defines. Falls back to light theme if not defined.
   ============================================ */
:root {
    --lang-surface: var(--surface, #ffffff);
    --lang-border: var(--border, #e2e8f0);
    --lang-primary: var(--primary, #7c3aed);
    --lang-hover: var(--hover, #f1f5f9);
    --lang-text-primary: var(--text-primary, #1e293b);
    --lang-text-secondary: var(--text-secondary, #64748b);
    --lang-text-muted: var(--text-muted, #94a3b8);
    --lang-card: var(--card, #ffffff);
    --lang-card-hover: var(--card-hover, #f8fafc);
}

/* ============================================
   LANGUAGE BUTTON IN NAVBAR
   ============================================ */

.lang-selector-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: var(--lang-surface);
    border: 1px solid var(--lang-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--lang-text-primary);
}

.lang-selector-btn:hover {
    border-color: var(--lang-primary);
    background: var(--lang-hover);
}

.lang-selector-btn .lang-flag {
    font-size: 1.25rem;
    line-height: 1;
}

.lang-selector-btn .lang-code {
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--lang-text-secondary);
}

.lang-selector-btn .lang-chevron {
    color: var(--lang-text-muted);
    transition: transform 0.2s ease;
}

.lang-selector-btn:hover .lang-chevron {
    color: var(--lang-primary);
}

/* ============================================
   MODAL OVERLAY
   ============================================ */

.lang-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.lang-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   MODAL CONTAINER
   ============================================ */

.lang-modal {
    background: var(--lang-card);
    border: 1px solid var(--lang-border);
    border-radius: 20px;
    width: 100%;
    max-width: 560px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lang-modal-overlay.active .lang-modal {
    transform: scale(1) translateY(0);
}

/* ============================================
   MODAL HEADER
   ============================================ */

.lang-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--lang-border);
    background: var(--lang-surface);
}

.lang-modal-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-modal-title svg {
    color: var(--lang-primary);
}

.lang-modal-title h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--lang-text-primary);
    margin: 0;
}

.lang-modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--lang-border);
    border-radius: 10px;
    color: var(--lang-text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-modal-close:hover {
    background: var(--lang-hover);
    border-color: var(--lang-primary);
    color: var(--lang-primary);
}

/* ============================================
   SEARCH BOX
   ============================================ */

.lang-search-box {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--lang-border);
}

.lang-search-input-wrap {
    position: relative;
}

.lang-search-input-wrap svg {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--lang-text-muted);
    pointer-events: none;
}

.lang-search-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    background: var(--lang-surface);
    border: 1px solid var(--lang-border);
    border-radius: 12px;
    font-size: 0.9375rem;
    color: var(--lang-text-primary);
    transition: all 0.2s ease;
}

.lang-search-input::placeholder {
    color: var(--lang-text-muted);
}

.lang-search-input:focus {
    outline: none;
    border-color: var(--lang-primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* ============================================
   CURRENT LANGUAGE INDICATOR
   ============================================ */

.lang-current {
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(99, 102, 241, 0.05) 100%);
    border-bottom: 1px solid var(--lang-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.lang-current-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-current-flag {
    font-size: 1.5rem;
    line-height: 1;
}

.lang-current-text {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.lang-current-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--lang-text-primary);
}

.lang-current-native {
    font-size: 0.8125rem;
    color: var(--lang-text-secondary);
}

.lang-current-badge {
    display: inline-flex;
    padding: 0.25rem 0.625rem;
    background: rgba(139, 92, 246, 0.2);
    color: var(--lang-primary);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 100px;
}

/* ============================================
   LANGUAGES LIST
   ============================================ */

.lang-list-container {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.lang-list-container::-webkit-scrollbar {
    width: 6px;
}

.lang-list-container::-webkit-scrollbar-track {
    background: transparent;
}

.lang-list-container::-webkit-scrollbar-thumb {
    background: var(--lang-border);
    border-radius: 3px;
}

.lang-list-container::-webkit-scrollbar-thumb:hover {
    background: var(--lang-text-muted);
}

/* Region Group */
.lang-region-group {
    margin-bottom: 0.5rem;
}

.lang-region-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--lang-text-muted);
    background: var(--lang-surface);
    position: sticky;
    top: 0;
    z-index: 1;
}

.lang-region-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--lang-border);
}

/* Language Item */
.lang-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: all 0.15s ease;
    border-left: 3px solid transparent;
}

.lang-item:hover {
    background: var(--lang-hover);
    border-left-color: var(--lang-primary);
}

.lang-item.active {
    background: linear-gradient(90deg, rgba(139, 92, 246, 0.15) 0%, transparent 100%);
    border-left-color: var(--lang-primary);
}

.lang-item-flag {
    font-size: 1.375rem;
    line-height: 1;
    flex-shrink: 0;
}

.lang-item-info {
    flex: 1;
    min-width: 0;
}

.lang-item-name {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--lang-text-primary);
    margin-bottom: 0.125rem;
}

.lang-item-native {
    font-size: 0.8125rem;
    color: var(--lang-text-secondary);
}

.lang-item-check {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    color: white;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.2s ease;
}

.lang-item.active .lang-item-check {
    opacity: 1;
    transform: scale(1);
}

/* Hidden when filtered */
.lang-item.hidden,
.lang-region-group.hidden {
    display: none;
}

/* No results message */
.lang-no-results {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    text-align: center;
}

.lang-no-results.visible {
    display: flex;
}

.lang-no-results svg {
    color: var(--lang-text-muted);
    margin-bottom: 1rem;
}

.lang-no-results p {
    font-size: 0.9375rem;
    color: var(--lang-text-secondary);
    margin: 0;
}

/* ============================================
   MODAL FOOTER
   ============================================ */

.lang-modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--lang-border);
    background: var(--lang-surface);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.lang-modal-footer .btn-cancel {
    padding: 0.625rem 1.25rem;
    background: transparent;
    border: 1px solid var(--lang-border);
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--lang-text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-modal-footer .btn-cancel:hover {
    background: var(--lang-hover);
    color: var(--lang-text-primary);
}

.lang-modal-footer .btn-apply {
    padding: 0.625rem 1.5rem;
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    border: none;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-modal-footer .btn-apply:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.lang-modal-footer .btn-apply:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 600px) {
    .lang-modal {
        max-height: 90vh;
        border-radius: 16px 16px 0 0;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        max-width: 100%;
        transform: translateY(100%);
    }

    .lang-modal-overlay.active .lang-modal {
        transform: translateY(0);
    }

    .lang-selector-btn .lang-code {
        display: none;
    }

    .lang-modal-header,
    .lang-search-box,
    .lang-current {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .lang-region-title,
    .lang-item {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* ============================================
   RTL SUPPORT
   ============================================ */

[dir="rtl"] .lang-item {
    border-left: none;
    border-right: 3px solid transparent;
}

[dir="rtl"] .lang-item:hover,
[dir="rtl"] .lang-item.active {
    border-left-color: transparent;
    border-right-color: var(--lang-primary);
}

[dir="rtl"] .lang-item.active {
    background: linear-gradient(270deg, rgba(139, 92, 246, 0.1) 0%, transparent 100%);
}

[dir="rtl"] .lang-search-input-wrap svg {
    left: auto;
    right: 1rem;
}

[dir="rtl"] .lang-search-input {
    padding: 0.875rem 2.75rem 0.875rem 1rem;
}