/* web_deployment/shared/css/common.css */

/**
 * Common styles for Homework Buddy multilingual website
 * Language switcher and progressive enhancement styles
 */

/* Language Switcher Styles */
.language-switcher {
    position: relative;
    display: inline-block;
}

.language-dropdown-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    color: inherit;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.language-dropdown-button:hover {
    border-color: #007bff;
    background-color: #f8f9fa;
}

.language-dropdown-button:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

.current-language {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-arrow {
    width: 12px;
    height: 12px;
    transition: transform 0.2s ease;
}

.language-switcher.open .dropdown-arrow {
    transform: rotate(180deg);
}

.language-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 120px;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
}

.language-switcher.open .language-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    display: block;
    padding: 10px 12px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s ease;
    border-bottom: 1px solid #f0f0f0;
}

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

.language-option:hover {
    background-color: #f8f9fa;
}

.language-option.active {
    background-color: #007bff;
    color: white;
}

.language-option:focus {
    outline: 2px solid #007bff;
    outline-offset: -2px;
}

/* Progressive Enhancement - No JavaScript fallback */
.language-switcher:not(.js-enabled) .language-dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    margin-top: 8px;
}

/* Hide dropdown by default until JavaScript loads */
.language-switcher:not(.open) .language-dropdown-menu {
    display: none;
}

/* Loading state for language detection */
.language-loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.language-loading::before {
    content: '';
    position: fixed;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: language-spinner 1s linear infinite;
    z-index: 9999;
}

@keyframes language-spinner {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .language-dropdown-menu {
        right: auto;
        left: 0;
        min-width: 100px;
    }

    .language-dropdown-button {
        padding: 6px 8px;
        font-size: 13px;
    }

    .language-option {
        padding: 8px 10px;
        font-size: 13px;
    }
}

/* SEO-friendly progressive enhancement for content */
.js-enabled [data-lang]:not(.active):not(.language-option) {
    display: none;
}

/* Before JavaScript loads, hide non-active languages gracefully */
[data-lang]:not([data-lang="sv"]):not(.language-option) {
    visibility: hidden;
    height: 0;
    overflow: hidden;
    position: absolute;
}

[data-lang].active {
    visibility: visible;
    height: auto;
    position: static;
}

/* Smooth transitions for content switching */
.content-section {
    transition: opacity 0.3s ease;
}

.content-section:not(.active) {
    opacity: 0;
}

.content-section.active {
    opacity: 1;
}