/**
 * Authentication Pages Internationalization CSS
 * Professional language selector inspired by Google/Microsoft design patterns
 */

/* Language Selector Component - Subtle and Professional */
.language-selector {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 1000;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.language-selector-trigger {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.75rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    color: #e5e7eb;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(12px);
    min-width: 5rem;
    position: relative;
}

.language-selector-trigger:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.language-selector-trigger:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.current-language {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.language-icon {
    font-size: 0.75rem;
    opacity: 0.7;
    color: #a5b4fc;
}

.dropdown-icon {
    font-size: 0.65rem;
    opacity: 0.6;
    transition: transform 0.2s ease;
    margin-left: auto;
}

.language-selector-trigger[aria-expanded="true"] .dropdown-icon {
    transform: rotate(180deg);
}

/* Language Dropdown */
.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 9rem;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    box-shadow:
        0 10px 25px rgba(0, 0, 0, 0.2),
        0 4px 10px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.95);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
    overflow: hidden;
}

.language-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.language-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: #e5e7eb;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
    position: relative;
}

.language-option:hover {
    background: rgba(99, 102, 241, 0.1);
    color: #f0f9ff;
}

.language-option:focus {
    outline: none;
    background: rgba(99, 102, 241, 0.15);
    color: #f0f9ff;
}

.language-option.active {
    background: rgba(99, 102, 241, 0.2);
    color: #c7d2fe;
}

.language-option.active::after {
    content: '✓';
    position: absolute;
    right: 1rem;
    font-size: 0.75rem;
    color: #6366f1;
    font-weight: 600;
}

.language-name {
    font-weight: 500;
    letter-spacing: 0.01em;
}

.language-native {
    font-size: 0.75rem;
    opacity: 0.7;
    font-weight: 400;
}

/* Loading and Animation States */
.language-selector.loading .language-selector-trigger {
    pointer-events: none;
    opacity: 0.7;
}

.language-selector.loading .dropdown-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Language Change Notification - Subtle Toast */
.language-change-notification {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(16, 185, 129, 0.95);
    backdrop-filter: blur(12px);
    color: white;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
    z-index: 9999;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.language-change-notification.show {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.language-change-notification.hide {
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
}

.language-change-notification i {
    font-size: 0.875rem;
}

/* Content transition during language change */
.i18n-content {
    transition: opacity 0.2s ease;
}

.i18n-content.changing {
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .language-selector {
        top: 1rem;
        right: 1rem;
    }

    .language-selector-trigger {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
        min-width: 4.5rem;
    }

    .language-icon {
        font-size: 0.7rem;
    }

    .dropdown-icon {
        font-size: 0.6rem;
    }

    .language-dropdown {
        min-width: 8rem;
        top: calc(100% + 0.375rem);
    }

    .language-option {
        padding: 0.625rem 0.875rem;
        font-size: 0.75rem;
    }

    .language-native {
        font-size: 0.7rem;
    }

    .language-change-notification {
        top: 1rem;
        right: 1rem;
        left: 1rem;
        padding: 0.625rem 0.875rem;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .language-selector {
        top: 0.75rem;
        right: 0.75rem;
    }

    .language-selector-trigger {
        padding: 0.375rem 0.5rem;
        font-size: 0.7rem;
        min-width: 4rem;
    }

    .current-language {
        font-size: 0.7rem;
    }

    .language-dropdown {
        min-width: 7rem;
        right: -0.5rem;
    }

    .language-option {
        padding: 0.5rem 0.75rem;
        font-size: 0.7rem;
    }
}

/* Accessibility and System Preferences */
@media (prefers-contrast: high) {
    .language-selector-trigger {
        border-width: 2px;
        border-color: #ffffff;
        background: rgba(0, 0, 0, 0.8);
    }

    .language-dropdown {
        border-width: 2px;
        border-color: #ffffff;
        background: rgba(0, 0, 0, 0.95);
    }
}

@media (prefers-reduced-motion: reduce) {
    .language-selector-trigger,
    .language-dropdown,
    .language-option,
    .language-change-notification,
    .dropdown-icon {
        transition: none;
        animation: none;
    }

    .language-selector-trigger:hover {
        transform: none;
    }

    .language-dropdown {
        transform: none;
    }

    .language-dropdown.show {
        transform: none;
    }
}

@media (prefers-color-scheme: dark) {
    .language-selector-trigger {
        background: rgba(0, 0, 0, 0.4);
        border-color: rgba(255, 255, 255, 0.15);
    }

    .language-dropdown {
        background: rgba(0, 0, 0, 0.9);
        border-color: rgba(255, 255, 255, 0.2);
    }
}

/* Focus and Keyboard Navigation */
.language-selector:focus-within .language-selector-trigger {
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Click Outside Detection */
.language-selector.open .language-dropdown {
    display: block;
}

/* RTL Language Support */
[dir="rtl"] .language-selector {
    left: 1.25rem;
    right: auto;
}

[dir="rtl"] .language-dropdown {
    left: 0;
    right: auto;
}

[dir="rtl"] .language-change-notification {
    left: 1.5rem;
    right: auto;
    transform: translateY(-10px) scale(0.95);
}

[dir="rtl"] .language-change-notification.show {
    transform: translateY(0) scale(1);
}

[dir="rtl"] .language-change-notification.hide {
    transform: translateY(-10px) scale(0.95);
}

/* Hover States for Better UX */
.language-selector-trigger:hover .language-icon {
    opacity: 1;
    color: #c7d2fe;
}

.language-selector-trigger:hover .dropdown-icon {
    opacity: 0.8;
}

/* Smooth font transitions for different languages */
.auth-content {
    font-feature-settings: "kern" 1, "liga" 1;
    text-rendering: optimizeLegibility;
}

/* Chinese font optimizations */
[lang="zh"] .auth-content,
[lang="zh-CN"] .auth-content {
    font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    letter-spacing: 0.02em;
}

/* English font optimizations */
[lang="en"] .auth-content {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    letter-spacing: -0.01em;
}

/* Form input adjustments for different languages */
[lang="zh"] .form-input,
[lang="zh-CN"] .form-input {
    font-size: 0.95rem;
    line-height: 1.5;
}

[lang="en"] .form-input {
    font-size: 1rem;
    line-height: 1.4;
}

/* Button text adjustments */
[lang="zh"] .btn-primary,
[lang="zh-CN"] .btn-primary {
    letter-spacing: 0.05em;
}

[lang="en"] .btn-primary {
    letter-spacing: 0.025em;
}