/*
Theme Name: Learning Theme
Description: Mobile-optimized WordPress theme for maximum Lighthouse performance
Version: 1.5.0
*/

/* CSS Variables */
:root{--primary:#2563eb;--secondary:#06b6d4;--bg:#f1f5f9;--text:#1e293b;--card:#ffffff;--header-bg:rgba(190,190,190,.85);--border:rgba(0,0,0,.08);--menu-dark:#1e293b;--footer-bg:rgb(232,232,232);--footer-text:#1e293b;--font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;--shadow:0 4px 12px rgba(0,0,0,.15);--radius:8px;--radius-lg:12px;--transition:.3s}

body.dark-mode{--bg:#0f172a;--text:#f8fafc;--card:#1e293b;--header-bg:rgba(15,23,42,.95);--border:rgba(255,255,255,.1);--menu-dark:#020617;--footer-bg:#0f172a;--footer-text:#f8fafc}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:var(--font);font-size:18px;line-height:1.7;color:var(--text);background:var(--bg);transition:background .4s,color .4s;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
h1,h2,h3,h4,h5,h6{font-family:var(--font);font-weight:700;line-height:1.2;color:var(--text)}
h1{font-size:2.5em}
h2{font-size:2em}
h3{font-size:1.5em}
h4{font-size:1.25em}
p{font-size:1.1em}

/* Layout */
.container{max-width:1400px;margin:0 auto;padding:0 5%}
.site-main{padding:2px 0 5px}

/* Header - SentiNetLinux Style */
header{display:flex;justify-content:space-between;align-items:center;padding:0 8%;height:80px;background:var(--header-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:1000}
.logo{font-size:21px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-0.5px}

/* Navigation - Dark Pill Style */
.na-link{display:flex;align-items:center;gap:5px;background:var(--menu-dark);padding:5px 8px;border-radius:100px;box-shadow:var(--shadow);list-style:none;margin:0}
.na-link a{color:#e1e1e1;font-weight:800;font-size:16px;padding:8px 16px;border-radius:100px;transition:all var(--transition);letter-spacing:0.5px;text-transform:capitalize;min-height:44px;display:flex;align-items:center;font-family:Verdana,sans-serif}
.na-link a:hover{color:#fff;background:rgba(255,255,255,.1)}
.na-link a.active{color:#fff;background:rgba(255,255,255,.15)}
.na-link .sub-menu{position:absolute;top:100%;background:var(--menu-dark);border-radius:10px;padding:8px;min-width:180px;box-shadow:var(--shadow);display:none}
.na-link li:hover>.sub-menu{display:block}
.na-link .sub-menu a{border-radius:6px;text-transform:capitalize;font-size:13px}

/* Header Actions */
.header-actions{display:flex;align-items:center;gap:12px}
.auth-desktop{display:flex;gap:10px;align-items:center}
.btn{padding:9px 18px;border-radius:8px;font-weight:700;cursor:pointer;transition:var(--transition);border:none;font-size:16px;display:inline-flex;align-items:center}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff}
.btn-primary:hover{opacity:.9;transform:translateY(-2px);color:#fff}
.signin{background:#000;color:#fff;border:1.5px solid #000}
.signin:hover{opacity:.9;transform:translateY(-2px)}
.signup{background:#eeeeee;color:#000;font-weight:700}
.signup:hover{opacity:.9;transform:translateY(-2px);color:#1e293b;font-weight:700}

/* Theme Toggle */
.theme-toggle{cursor:pointer;font-size:18px;margin-left:5px;user-select:none;width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--menu-dark);border-radius:50%;transition:transform var(--transition)}
.theme-toggle:hover{transform:scale(1.1)}

/* Mobile Menu Toggle */
.menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;z-index:1100}
.menu-toggle span{width:22px;height:2px;background:var(--text);transition:var(--transition);border-radius:2px}
.menu-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Hero */
.hero{padding:80px 8% 60px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,48px);font-weight:800;margin-bottom:20px;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:#64748b;font-size:18px;max-width:650px;margin:0 auto 35px}
body.dark-mode .hero p{color:#94a3b8}

/* Posts Grid - Mobile First */
.posts-grid{display:grid;grid-template-columns:1fr;gap:16px}
.post-card{background:var(--card);padding:16px;border-radius:var(--radius-lg);border:1px solid var(--border);transition:transform var(--transition)}
.post-card:hover{transform:translateY(-2px)}
.post-card .post-thumbnail{margin:-16px -16px 16px;border-radius:var(--radius-lg) var(--radius-lg) 0 0;overflow:hidden}
.post-card .post-thumbnail img{width:100%;aspect-ratio:16/10;object-fit:cover}
.post-card .cat-links{margin-bottom:8px}
.post-card .cat-links a{background:var(--primary);color:#fff;padding:3px 10px;border-radius:100px;font-size:11px;font-weight:600;text-transform:capitalize}
.post-card .entry-title{font-size:16px;font-weight:700;margin-bottom:8px}
.post-card .entry-title a{color:var(--text)}
.post-card .entry-title a:hover{color:var(--primary)}
.post-card .entry-excerpt{color:#64748b;font-size:13px;margin-bottom:12px}
body.dark-mode .post-card .entry-excerpt{color:#94a3b8}
.post-card .entry-meta{font-size:12px;color:#64748b}
body.dark-mode .post-card .entry-meta{color:#94a3b8}

/* Section Header */
.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding:0 16px}
@media(max-width:767px){.section-header{justify-content:center}}
.section-header h2{font-size:20px;font-weight:700;text-align:center}
.view-all-link{color:var(--primary);font-weight:600;font-size:13px}

/* Categories */
.categories-section{padding:32px 0;background:var(--card)}
.categories-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.category-card{background:var(--bg);padding:16px;border-radius:var(--radius-lg);text-align:center;border:1px solid var(--border);transition:transform var(--transition)}
.category-card:hover{transform:translateY(-2px)}
.category-card h3{font-size:14px;margin-bottom:4px}
.category-card span{font-size:12px;color:#64748b}
body.dark-mode .category-card span{color:#94a3b8}

/* Page Header */
.page-header{padding:32px 0 24px;text-align:center}
.page-header h1{font-size:clamp(20px,5vw,28px);background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px}
.page-header p{color:#64748b;font-size:14px;max-width:500px;margin:0 auto}
body.dark-mode .page-header p{color:#94a3b8}

/* Filters */
.posts-filters{display:flex;flex-direction:column;gap:12px;margin-bottom:24px;padding:0 16px}
.filter-categories,.filter-tabs{display:flex;gap:8px;flex-wrap:wrap}
.filter-btn,.filter-tab{padding:8px 16px;background:var(--card);border:1px solid var(--border);border-radius:100px;color:var(--text);font-weight:600;font-size:13px;cursor:pointer;min-height:40px}
.filter-btn:hover,.filter-btn.active,.filter-tab:hover,.filter-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.filter-search input{padding:10px 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--text);font-size:14px;width:100%}
.filter-count{font-size:12px;color:#64748b}
body.dark-mode .filter-count{color:#94a3b8}

/* Video/Photo Grid */
.video-grid,.photo-gallery{display:grid;grid-template-columns:1fr;gap:16px}
.video-card{background:var(--card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border)}
.video-thumbnail{position:relative}
.video-thumbnail img{width:100%;aspect-ratio:16/9;object-fit:cover}
.placeholder-thumb{width:100%;aspect-ratio:16/9;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600}
.video-info{padding:12px}
.video-meta{display:flex;gap:8px;margin-bottom:6px;font-size:12px}
.video-category{color:var(--primary);font-weight:600}
.video-date{color:#64748b}
.video-info h3{font-size:14px;margin-bottom:4px}
.video-info h3 a{color:var(--text)}
.video-info p{color:#64748b;font-size:12px}
.video-footer{display:flex;justify-content:space-between;align-items:center;padding-top:10px;border-top:1px solid var(--border);font-size:12px}
.video-author{display:flex;align-items:center;gap:6px;font-weight:600}
.author-avatar{width:24px;height:24px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:10px}
.video-views{display:flex;align-items:center;gap:4px;color:#64748b}
.video-views svg{width:14px;height:14px}
body.dark-mode .video-date,body.dark-mode .video-info p,body.dark-mode .video-views{color:#94a3b8}

/* Photo Gallery */
.gallery-item{border-radius:var(--radius-lg);overflow:hidden;background:var(--card)}
.gallery-link{display:block;position:relative}
.gallery-link img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .3s}
.gallery-item:hover .gallery-link img{transform:scale(1.03)}
.gallery-overlay{position:absolute;inset:0;background:rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--transition)}
.gallery-item:hover .gallery-overlay{opacity:1}
.gallery-item figcaption{padding:10px 12px;font-size:12px;color:#64748b;background:var(--card)}
body.dark-mode .gallery-item figcaption{color:#94a3b8}

/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.95);z-index:10000;display:none;justify-content:center;align-items:center}
.lightbox.active{display:flex}
.lightbox-close{position:fixed;top:16px;right:16px;width:44px;height:44px;background:rgba(255,255,255,.1);border:0;border-radius:50%;color:#fff;font-size:24px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-nav{position:fixed;top:50%;transform:translateY(-50%);width:44px;height:44px;background:rgba(255,255,255,.1);border:0;border-radius:50%;color:#fff;font-size:24px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-prev{left:12px}
.lightbox-next{right:12px}
.lightbox-content img{max-width:95vw;max-height:80vh;border-radius:8px}
.lightbox-caption{color:#fff;margin-top:12px;font-size:14px;text-align:center}
.lightbox-counter{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,.5);padding:6px 16px;border-radius:20px;font-size:12px;color:#fff}

/* Footer - SentiNetLinux Style */
.site-footer{background:var(--footer-bg);color:var(--footer-text);padding:60px 8% 30px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(0,0,0,.05);max-width:1200px;margin:0 auto;text-align:center}
.footer-col h3{color:var(--text);margin-bottom:15px;font-size:18px;font-weight:600}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:8px;font-size:14px}
.footer-col ul li a{color:inherit}
.footer-col ul li a:hover{color:var(--primary)}
.footer-bottom{padding-top:30px;text-align:center;font-size:13px;font-weight:500}
body.dark-mode .footer-bottom p{color:#ababab}

/* Pagination */
.pagination{display:flex;justify-content:center;gap:6px;margin-top:32px;padding:0 16px}
.pagination a,.pagination span{padding:8px 14px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-weight:600;font-size:13px}
.pagination a:hover,.pagination .current{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Single Post */
.single-post .entry-header{padding:32px 0;text-align:center;max-width:800px;margin:0 auto}
.single-post .entry-title{font-size:clamp(22px,5vw,32px);background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:16px}
.single-post .entry-content{padding:0 16px;font-size:16px;line-height:1.7}
.single-post .entry-content h2{font-size:20px;margin:24px 0 12px}
.single-post .entry-content p{margin-bottom:16px}
.single-post .entry-content img{border-radius:var(--radius-lg);margin:20px 0}
.single-post .entry-content blockquote{border-left:3px solid var(--primary);padding-left:16px;margin:20px 0;font-style:italic;color:#64748b}
.single-post .entry-content code{background:var(--bg);padding:2px 6px;border-radius:4px;font-size:14px}
.single-post .entry-content pre{background:#1e293b;color:#e2e8f0;padding:16px;border-radius:var(--radius-lg);overflow-x:auto;margin:20px 0}
.single-post .entry-content pre code{background:0;padding:0}
body.dark-mode .single-post .entry-content blockquote{color:#94a3b8}

/* Video Container */
.video-container{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:var(--radius-lg);margin:20px 0}
.video-container iframe,.video-container video{position:absolute;top:0;left:0;width:100%;height:100%;border:0}

/* Accessibility */
.screen-reader-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(1px,1px,1px,1px)}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

/* Mobile Navigation - Full Screen Overlay */
@media(max-width:992px){
    header{position:sticky;top:0;z-index:9999;display:flex;flex-wrap:wrap;align-items:center}
    header::before{content:'';position:absolute;inset:0;background:var(--header-bg);z-index:-1}
    .na-link{position:fixed;top:0;left:0;right:0;bottom:0;width:100%;height:100vh;flex-direction:column;padding:80px 20px 20px;opacity:0;visibility:hidden;transition:all .3s ease;background:var(--menu-dark);z-index:9998;justify-content:center;overflow-y:auto}
    .na-link.active{opacity:1;visibility:visible}
    .na-link a{width:100%;text-align:center;padding:18px;font-size:20px;border-radius:10px;text-transform:capitalize;font-weight:600}
    .na-link .sub-menu{position:static;background:rgba(255,255,255,.1);padding:0;box-shadow:none;margin-top:8px}
    .na-link .sub-menu a{padding:10px 16px;font-size:14px}
    .menu-toggle{display:flex;position:relative;z-index:10000}
    .menu-toggle.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .menu-toggle.active span:nth-child(2){opacity:0}
    .menu-toggle.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .auth-desktop{display:none}
    .auth-mobile{display:flex!important;flex-direction:column;gap:10px;margin-top:20px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);width:100%}
    .auth-mobile .btn{justify-content:center;width:100%}
    .auth-mobile .signin{background:#000;color:#fff;border-color:#000}
}

/* Medium Screens */
@media(min-width:480px){
    .categories-grid{grid-template-columns:repeat(3,1fr)}
    .video-grid,.photo-gallery{grid-template-columns:repeat(2,1fr)}
}

/* Tablet */
@media(min-width:768px){
    .hero{padding:80px 8%}
    .posts-grid{grid-template-columns:repeat(2,1fr);gap:20px}
    .post-card{padding:20px}
    .post-card .post-thumbnail{margin:-20px -20px 20px}
    .categories-grid{grid-template-columns:repeat(3,1fr);gap:16px}
    .video-grid,.photo-gallery{grid-template-columns:repeat(2,1fr);gap:20px}
    .video-info{padding:16px}
}

/* Desktop */
@media(min-width:1024px){
    .posts-grid{grid-template-columns:repeat(3,1fr);gap:24px}
    .post-card{padding:24px}
    .post-card .post-thumbnail{margin:-24px -24px 24px}
    .categories-grid{grid-template-columns:repeat(6,1fr)}
    .video-grid,.photo-gallery{grid-template-columns:repeat(3,1fr)}
}

/* Print */
@media print{
    .site-header,.site-footer,.theme-toggle,.menu-toggle,.reading-controls,.btn,.pagination,.lightbox{display:none!important}
    body{background:#fff;color:#000}
}

/* Reduced Motion */
@media(prefers-reduced-motion:reduce){
    *,*::before,*::after{transition:none!important;animation:none!important}
    html{scroll-behavior:auto}
}