/* ==========================================================================
   common.css - Shared styles for Cognitive Research Center (CRC)
   Extracted from: index.html, blog_en.html, basics_en.html,
                   ptsd_vr_en.html, tests_en.html, about_en.html
   ========================================================================== */


/* ==========================================================================
   1. GENERAL / BODY / CONTAINER STYLES
   ========================================================================== */

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #1a1a1a;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

main {
    flex-grow: 1;
}


/* ==========================================================================
   2. STICKY HEADER
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #f0f0f0;
}

.logo {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a1a;
}

.nav-container {
    display: flex;
    align-items: center;
    gap: 20px;
}


/* ==========================================================================
   3. NAVIGATION LINKS
   ========================================================================== */

nav a {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif !important;
    text-decoration: none !important;
    color: #1a1a1a !important;
    margin-left: 20px;
    font-size: 16px;
    padding-bottom: 4px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s, color 0.3s;
}

nav a.active-link {
    font-weight: 600;
    border-bottom-color: #1a1a1a;
}

nav a:not(.active-link):hover {
    border-bottom-color: #ccc;
}


/* ==========================================================================
   4. LANGUAGE SELECTOR
   ========================================================================== */

.language-selector {
    position: relative;
    margin-left: 20px;
}

.current-language {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.3s;
    user-select: none;
}

.current-language:hover {
    background-color: #f5f5f5;
}

.language-code {
    font-size: 14px;
    font-weight: 600;
    color: #1a1a1a;
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    min-width: 100px;
    overflow: hidden;
}

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

.language-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    cursor: pointer;
    transition: background-color 0.2s;
    text-decoration: none;
    color: #1a1a1a;
}

.language-option:hover {
    background-color: #f5f5f5;
}

.language-option.current {
    background-color: #f0f0f0;
    font-weight: 600;
}


/* ==========================================================================
   5. BLOG / LIST-PAGE STYLES (blog, basics)
   ========================================================================== */

.blog-header {
    padding: 140px 0 60px;
}

.blog-header h1 {
    font-size: 52px;
    font-weight: 300;
    margin: 0;
}

.blog-post {
    border-top: 1px solid #e0e0e0;
    padding: 40px 0;
}

.blog-post:last-child {
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: 60px;
}

.post-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.post-details {
    flex-basis: 50%;
    padding-right: 40px;
}

.post-title {
    font-size: 29px;
    font-weight: 400;
    margin: 0 0 20px 0;
}

.post-tags .tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 15px;
    font-size: 14px;
    margin-right: 10px;
    font-weight: 500;
}

.post-tags .tag-gray {
    background-color: #e0e0e0;
    color: #666;
}

.post-tags .tag-green {
    background-color: #d4edda;
    color: #155724;
}

.post-excerpt {
    flex-basis: 50%;
    max-width: 450px;
}

.post-excerpt p {
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    margin-top: 0;
}

.keep-reading {
    text-decoration: none;
    color: #1a1a1a !important;
    font-weight: bold;
    display: inline-block;
    margin-top: 20px;
    border-bottom: 1px solid #1a1a1a;
    padding-bottom: 2px;
}

.keep-reading span {
    margin-left: 5px;
    transition: margin-left 0.3s;
}

.keep-reading:hover span {
    margin-left: 10px;
}


/* ==========================================================================
   6. ARTICLE STYLES (ptsd_vr, about, and similar article pages)
   ========================================================================== */

.article-section {
    padding: 60px 0;
}

.article-title {
    font-size: 48px;
    font-weight: 300;
    margin: 0 0 25px 0;
    line-height: 1.2;
}

.article-section a {
    color: #888 !important;
    text-decoration: underline;
}

.article-section a:hover {
    color: #666 !important;
}

.article-section h2 {
    font-size: 32px;
    font-weight: 500;
    margin: 60px 0 20px 0;
    border-top: 1px solid #e0e0e0;
    padding-top: 40px;
}

.article-section h3 {
    font-size: 24px;
    font-weight: 500;
    margin: 40px 0 15px 0;
}

.article-section p,
.article-section li {
    font-size: 18px;
    color: #333;
    margin-bottom: 20px;
}

.article-section ol,
.article-section ul {
    padding-left: 25px;
}

/* Article image */
.article-image-container {
    margin: 40px 0;
    text-align: center;
}

.article-image-container img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.article-image-container figcaption {
    font-size: 14px;
    color: #888;
    margin-top: 10px;
    font-style: italic;
}

/* Highlight box */
.highlight-box {
    background-color: #f8f9fa;
    border-left: 4px solid #1a1a1a;
    padding: 25px 30px;
    margin: 40px 0;
    border-radius: 0 8px 8px 0;
}

.highlight-box p,
.highlight-box ul,
.highlight-box li {
    margin: 0;
    padding: 0;
    list-style-position: inside;
}

.highlight-box ul {
    margin-top: 15px;
}

/* External link (gray style) */
.external-link-gray a {
    color: #888 !important;
    text-decoration: underline;
}

.external-link-gray a:hover {
    color: #666 !important;
}

/* Article in-page navigation */
.article-navigation {
    background-color: #fafafa;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    padding: 15px 20px;
    margin: 30px 0;
}

.nav-title {
    font-size: 16px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-list li {
    margin-bottom: 0;
}

.nav-list a {
    color: #888 !important;
    text-decoration: none;
    font-size: 14px;
    display: block;
    padding: 4px 0;
    transition: color 0.3s ease;
    line-height: 1.4;
}

.nav-list a:hover {
    color: #666 !important;
}


/* ==========================================================================
   7. FOOTER STYLES (with !important overrides for Tilda defaults)
   ========================================================================== */

.site-footer {
    background-color: #ffffff !important;
    padding: 40px 0 !important;
    margin-top: 0 !important;
    font-size: 14px !important;
    color: #555 !important;
    border-top: none !important;
}

.site-footer .footer-container {
    display: flex !important;
    justify-content: space-between !important;
    align-items: flex-end !important;
    width: 100% !important;
    max-width: 100% !important;
    margin: 0 !important;
    padding: 0 40px !important;
    box-sizing: border-box !important;
}

.site-footer .footer-copyright {
    flex-basis: auto !important;
    align-self: flex-end !important;
}

.site-footer .footer-nav {
    display: flex !important;
    gap: 60px !important;
    align-items: flex-start !important;
}

.site-footer .footer-column {
    text-align: left !important;
}

.site-footer .footer-column h4 {
    font-size: 16px !important;
    font-weight: 600 !important;
    color: #1a1a1a !important;
    margin: 0 0 15px 0 !important;
    padding: 0 !important;
    text-align: left !important;
}

.site-footer .footer-column h4 a {
    text-decoration: none !important;
    color: #1a1a1a !important;
}

.site-footer .footer-column ul {
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
    text-align: left !important;
}

.site-footer .footer-column li {
    margin: 0 0 10px 0 !important;
    padding: 0 !important;
    text-align: left !important;
    list-style: none !important;
}

.site-footer .footer-column a {
    text-decoration: none !important;
    color: #555 !important;
    transition: color 0.3s;
    display: inline-block !important;
}

.site-footer .footer-column a:hover {
    color: #1a1a1a !important;
}


/* ==========================================================================
   8. RESPONSIVE MEDIA QUERIES
   ========================================================================== */

/* --- Tablet (max-width: 1024px) --- */
@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }
}

/* --- Mobile (max-width: 768px) --- */
@media (max-width: 768px) {
    .site-header {
        flex-direction: column;
        gap: 15px;
    }

    .nav-container {
        flex-wrap: wrap;
        justify-content: center;
    }

    /* Blog / list-page responsive */
    .blog-header {
        padding-top: 60px;
    }

    .blog-header h1 {
        font-size: 36px;
    }

    .post-content {
        flex-direction: column;
    }

    .post-details,
    .post-excerpt {
        flex-basis: 100%;
        max-width: 100%;
        padding-right: 0;
    }

    .post-excerpt {
        margin-top: 20px;
    }

    .post-title {
        font-size: 24px;
    }

    /* Article responsive */
    .article-title {
        font-size: 38px;
    }

    .article-section h2 {
        font-size: 28px;
    }
}

/* --- Mobile (max-width: 767px) --- */
@media (max-width: 767px) {
    .site-header {
        padding: 15px;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }

    .nav-container {
        flex-wrap: wrap;
        justify-content: center;
    }

    .language-selector {
        margin-left: 0;
        margin-top: 10px;
    }

    /* Footer responsive */
    .site-footer .footer-container {
        flex-direction: column;
        gap: 30px;
    }

    .site-footer .footer-nav {
        flex-direction: row;
        align-items: flex-start;
        gap: 40px;
    }
}