/*
Theme Name: Kira LoiGiai Net
Theme URI: https://loigiai.net/
Author: LoiGiai.net
Author URI: https://loigiai.net/
Description: Theme WordPress cho cổng học liệu và lời giải LoiGiai.net — header/footer/sidebar tách bạch, layout page/post/category đầy đủ, responsive, tối ưu tốc độ và SEO. Phong cách hiện đại với tông cam–đỏ học đường.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.5
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: kira-loigiai-net
Tags: education, blog, two-columns, right-sidebar, custom-logo, custom-menu, featured-images, translation-ready
*/

:root{
  --brand-orange:#ea580c; --brand-red:#be1818; --brand-ink:#0f172a;
  --brand-grad:linear-gradient(135deg,#ea580c 0%,#be1818 100%);
  --c-text:#1f2937; --c-muted:#64748b; --c-line:#e9edf3; --c-bg:#ffffff;
  --c-soft:#f7f9fc; --c-soft2:#fff5ef; --c-link:#c2410c;
  --radius:14px; --radius-sm:10px; --shadow:0 10px 30px rgba(15,23,42,.08);
  --shadow-sm:0 4px 14px rgba(15,23,42,.06); --maxw:1200px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'Noto Sans',sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--c-text);background:var(--c-bg);line-height:1.7;font-size:16.5px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-link);text-decoration:none;transition:color .15s}
a:hover{color:var(--brand-red)}
h1,h2,h3,h4,h5{color:var(--brand-ink);line-height:1.25;font-weight:800;margin:0 0 .5em}
h1{font-size:2.05rem}h2{font-size:1.6rem}h3{font-size:1.25rem}
p{margin:0 0 1.1em}
ul,ol{padding-left:1.3em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;gap:.5em;font-weight:700;border-radius:999px;padding:.72em 1.5em;border:0;cursor:pointer;font-size:.98rem;transition:transform .12s,box-shadow .15s;line-height:1}
.btn-primary{background:var(--brand-grad);color:#fff;box-shadow:0 8px 20px rgba(190,24,24,.25)}
.btn-primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 12px 26px rgba(190,24,24,.34)}
.btn-ghost{background:#fff;color:var(--brand-red);border:1.5px solid var(--c-line)}
.btn-ghost:hover{border-color:var(--brand-orange);color:var(--brand-red)}
.btn-light{background:rgba(255,255,255,.16);color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-light:hover{background:#fff;color:var(--brand-red)}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:8px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:1000}

/* ---------- Header ---------- */
.site-topbar{background:var(--brand-ink);color:#cbd5e1;font-size:.85rem}
.site-topbar .container{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:38px}
.site-topbar a{color:#cbd5e1}.site-topbar a:hover{color:#fff}
.topbar-links{display:flex;gap:18px;list-style:none;margin:0;padding:0}
.site-header{position:sticky;top:0;z-index:200;background:rgba(255,255,255,.96);backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--c-line)}
.header-inner{display:flex;align-items:center;gap:24px;min-height:78px}
.site-branding .logo-img{height:46px;width:auto}
.site-branding .text-logo{font-weight:900;font-size:1.5rem;color:var(--brand-ink)}
.site-branding .text-logo span{color:var(--brand-orange)}
.main-nav{margin-left:auto}
.main-nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.main-nav a{display:block;padding:.6em .95em;font-weight:600;color:#334155;border-radius:10px;font-size:.98rem}
.main-nav a:hover,.main-nav .current-menu-item>a{color:var(--brand-red);background:var(--c-soft2)}
.main-nav li{position:relative}
.main-nav .sub-menu{position:absolute;top:100%;left:0;min-width:220px;background:#fff;box-shadow:var(--shadow);border:1px solid var(--c-line);border-radius:12px;padding:8px;display:none;flex-direction:column}
.main-nav li:hover>.sub-menu{display:flex}
.main-nav .sub-menu a{padding:.5em .8em}
.header-actions{display:flex;align-items:center;gap:10px}
.search-toggle,.menu-toggle{background:var(--c-soft);border:1px solid var(--c-line);width:44px;height:44px;border-radius:12px;display:none;align-items:center;justify-content:center;cursor:pointer;color:var(--brand-ink)}
.search-toggle{display:flex}
.header-search{position:relative}
.header-search form{display:flex;align-items:center}
.header-search input[type=search]{border:1px solid var(--c-line);background:var(--c-soft);border-radius:999px;padding:.55em 1em;width:210px;font-size:.92rem;outline:none}
.header-search input:focus{border-color:var(--brand-orange);background:#fff}

/* ---------- Hero / slider ---------- */
.hero{position:relative;color:#fff;overflow:hidden}
.hero-slide{position:relative;min-height:480px;display:flex;align-items:center;background-size:cover;background-position:center}
.hero-slide::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(15,23,42,.86) 0%,rgba(15,23,42,.55) 55%,rgba(190,24,24,.45) 100%)}
.hero-content{position:relative;z-index:2;max-width:640px;padding:54px 0}
.hero .eyebrow{display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.32);padding:.4em 1em;border-radius:999px;font-size:.82rem;font-weight:600;margin-bottom:18px;letter-spacing:.02em}
.hero h1{color:#fff;font-size:2.7rem;margin-bottom:.4em}
.hero p{font-size:1.16rem;color:#e2e8f0;margin-bottom:1.6em;max-width:540px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-dots{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);display:flex;gap:9px;z-index:3}
.hero-dots button{width:11px;height:11px;border-radius:50%;border:0;background:rgba(255,255,255,.45);cursor:pointer;padding:0}
.hero-dots button.active{background:#fff;width:28px;border-radius:6px}

/* quick subject chips */
.subject-strip{background:#fff;border-bottom:1px solid var(--c-line)}
.subject-strip .container{display:flex;gap:10px;flex-wrap:wrap;padding-top:18px;padding-bottom:18px}
.subject-chip{display:inline-flex;align-items:center;gap:.5em;background:var(--c-soft);border:1px solid var(--c-line);border-radius:999px;padding:.5em 1.05em;font-weight:600;font-size:.92rem;color:#334155}
.subject-chip:hover{border-color:var(--brand-orange);color:var(--brand-red);background:var(--c-soft2)}

/* ---------- Sections ---------- */
.section{padding:62px 0}
.section.alt{background:var(--c-soft)}
.section-head{text-align:center;max-width:680px;margin:0 auto 40px}
.section-head .kicker{color:var(--brand-orange);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.82rem;display:block;margin-bottom:8px}
.section-head h2{font-size:1.95rem}
.section-head p{color:var(--c-muted)}

.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}

/* category cards */
.cat-card{position:relative;border-radius:var(--radius);overflow:hidden;min-height:200px;display:flex;align-items:flex-end;color:#fff;box-shadow:var(--shadow-sm)}
.cat-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.cat-card:hover img{transform:scale(1.07)}
.cat-card::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(15,23,42,.9),rgba(15,23,42,.05))}
.cat-card .cat-body{position:relative;z-index:2;padding:18px 20px}
.cat-card h3{color:#fff;margin:0 0 4px;font-size:1.18rem}
.cat-card .count{font-size:.83rem;color:#e2e8f0}

/* post cards */
.card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;transition:transform .15s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card-thumb{display:block;aspect-ratio:16/10;overflow:hidden}
.card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.card:hover .card-thumb img{transform:scale(1.06)}
.card-body{padding:18px 20px 22px;display:flex;flex-direction:column;flex:1}
.card .cat-badge{align-self:flex-start;background:var(--c-soft2);color:var(--brand-red);font-weight:700;font-size:.74rem;text-transform:uppercase;letter-spacing:.04em;padding:.32em .8em;border-radius:999px;margin-bottom:11px}
.card h3{font-size:1.12rem;margin:0 0 .5em}
.card h3 a{color:var(--brand-ink)}.card h3 a:hover{color:var(--brand-red)}
.card .excerpt{color:var(--c-muted);font-size:.94rem;margin:0 0 14px;flex:1}
.card .meta{font-size:.82rem;color:#94a3b8;display:flex;gap:14px;align-items:center}
.card .meta .read-more{margin-left:auto;color:var(--brand-red);font-weight:700}

/* feature blocks */
.feature{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:26px 24px;box-shadow:var(--shadow-sm)}
.feature .ico{width:54px;height:54px;border-radius:14px;background:var(--c-soft2);display:flex;align-items:center;justify-content:center;color:var(--brand-red);margin-bottom:16px;font-size:1.5rem}
.feature h3{font-size:1.16rem}.feature p{color:var(--c-muted);margin:0;font-size:.95rem}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat .num{font-size:2.5rem;font-weight:900;background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1}
.stat .lbl{color:var(--c-muted);font-weight:600;margin-top:6px}

/* CTA banner */
.cta-banner{position:relative;border-radius:20px;overflow:hidden;color:#fff;text-align:center;padding:58px 24px}
.cta-banner img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cta-banner::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(190,24,24,.92),rgba(15,23,42,.86))}
.cta-banner .inner{position:relative;z-index:2;max-width:640px;margin:0 auto}
.cta-banner h2{color:#fff;font-size:2rem}
.cta-banner p{color:#fde9e0;font-size:1.08rem;margin-bottom:1.5em}

/* ---------- Content layout ---------- */
.layout{display:grid;grid-template-columns:1fr 320px;gap:40px;padding:46px 0}
.layout.full{grid-template-columns:1fr}
.page-hero{position:relative;color:#fff;padding:60px 0 50px;background:var(--brand-ink);overflow:hidden}
.page-hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.32}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(15,23,42,.86),rgba(190,24,24,.6))}
.page-hero .container{position:relative;z-index:2}
.page-hero h1{color:#fff;font-size:2.3rem;margin-bottom:.3em}
.page-hero .lead{color:#e2e8f0;max-width:680px;margin:0}
.breadcrumb{font-size:.86rem;color:#94a3b8;margin-bottom:14px}
.breadcrumb a{color:#cbd5e1}.breadcrumb a:hover{color:#fff}
.page-hero .breadcrumb a{color:#e2e8f0}
.breadcrumb .sep{margin:0 8px;opacity:.6}

article.entry{background:#fff}
.entry-figure{border-radius:var(--radius);overflow:hidden;margin:0 0 26px;box-shadow:var(--shadow-sm)}
.entry-meta{display:flex;flex-wrap:wrap;gap:16px;align-items:center;color:var(--c-muted);font-size:.9rem;margin:0 0 22px}
.entry-meta .cat-badge{background:var(--c-soft2);color:var(--brand-red);font-weight:700;padding:.3em .8em;border-radius:999px;font-size:.8rem}
.entry-content{font-size:1.05rem}
.entry-content h2{margin-top:1.4em;font-size:1.5rem}
.entry-content h3{margin-top:1.3em;color:var(--brand-red)}
.entry-content img{border-radius:var(--radius);margin:1.2em 0}
.entry-content blockquote{border-left:4px solid var(--brand-orange);background:var(--c-soft2);margin:1.4em 0;padding:1em 1.3em;border-radius:0 12px 12px 0;color:#7c2d12;font-style:italic}
.entry-content a{text-decoration:underline;text-underline-offset:3px}
.entry-content ul li,.entry-content ol li{margin-bottom:.4em}
.entry-content table{width:100%;border-collapse:collapse;margin:1.2em 0}
.entry-content th,.entry-content td{border:1px solid var(--c-line);padding:.6em .8em;text-align:left}
.entry-content th{background:var(--c-soft)}
.tagcloud{margin-top:26px;display:flex;gap:8px;flex-wrap:wrap}
.tagcloud a{background:var(--c-soft);border:1px solid var(--c-line);padding:.35em .85em;border-radius:999px;font-size:.84rem!important;color:#475569}
.tagcloud a:hover{border-color:var(--brand-orange);color:var(--brand-red)}

.share-row{display:flex;gap:10px;align-items:center;margin:30px 0;padding:18px 0;border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.share-row span{font-weight:700;color:var(--brand-ink)}
.share-row a{width:38px;height:38px;border-radius:10px;background:var(--c-soft);display:flex;align-items:center;justify-content:center;color:#475569;font-weight:700;font-size:.85rem}
.share-row a:hover{background:var(--brand-grad);color:#fff}

.author-box{display:flex;gap:18px;background:var(--c-soft);border:1px solid var(--c-line);border-radius:var(--radius);padding:22px;margin:30px 0}
.author-box .ava{width:64px;height:64px;border-radius:50%;background:var(--brand-grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.4rem;flex-shrink:0}
.author-box h4{margin:0 0 4px}.author-box p{margin:0;color:var(--c-muted);font-size:.94rem}

/* related */
.related h3.block-title,.section-title{font-size:1.35rem;margin:0 0 20px;position:relative;padding-left:14px}
.related h3.block-title::before,.section-title::before{content:"";position:absolute;left:0;top:.15em;bottom:.15em;width:5px;border-radius:4px;background:var(--brand-grad)}
.related{margin-top:40px}

/* comments */
.comments-area{margin-top:40px}
.comment-list{list-style:none;padding:0}
.comment-body{background:var(--c-soft);border:1px solid var(--c-line);border-radius:12px;padding:16px 18px;margin-bottom:14px}
.comment-form input,.comment-form textarea{width:100%;border:1px solid var(--c-line);border-radius:10px;padding:.7em .9em;margin-bottom:12px;font-family:inherit;font-size:.95rem}

/* ---------- Sidebar ---------- */
.sidebar .widget{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:22px;margin-bottom:26px;box-shadow:var(--shadow-sm)}
.sidebar .widget-title{font-size:1.08rem;margin:0 0 16px;padding-left:12px;position:relative}
.sidebar .widget-title::before{content:"";position:absolute;left:0;top:.1em;bottom:.1em;width:4px;border-radius:3px;background:var(--brand-grad)}
.sidebar ul{list-style:none;padding:0;margin:0}
.sidebar ul li{padding:.5em 0;border-bottom:1px dashed var(--c-line)}
.sidebar ul li:last-child{border-bottom:0}
.sidebar ul li a{color:#334155;font-weight:500}
.sidebar ul li a:hover{color:var(--brand-red)}
.widget-search form{display:flex;gap:8px}
.widget-search input[type=search]{flex:1;border:1px solid var(--c-line);border-radius:10px;padding:.6em .8em}
.widget-search button{background:var(--brand-grad);border:0;color:#fff;border-radius:10px;padding:0 14px;cursor:pointer;font-weight:700}
.mini-post{display:flex;gap:12px;padding:.7em 0;border-bottom:1px dashed var(--c-line)}
.mini-post:last-child{border-bottom:0}
.mini-post .thumb{width:64px;height:54px;border-radius:10px;overflow:hidden;flex-shrink:0}
.mini-post .thumb img{width:100%;height:100%;object-fit:cover}
.mini-post h4{font-size:.9rem;margin:0 0 4px;line-height:1.35}
.mini-post h4 a{color:var(--brand-ink)}.mini-post h4 a:hover{color:var(--brand-red)}
.mini-post .d{font-size:.78rem;color:#94a3b8}
.widget-cta{background:var(--brand-grad);color:#fff;text-align:center}
.widget-cta .widget-title{color:#fff}.widget-cta .widget-title::before{background:#fff}
.widget-cta p{color:#fde9e0;font-size:.92rem}
.cat-list li{display:flex;justify-content:space-between;align-items:center}
.cat-list .badge{background:var(--c-soft2);color:var(--brand-red);font-size:.78rem;font-weight:700;padding:.1em .6em;border-radius:999px}

/* archive header */
.archive-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.list-pagination{display:flex;justify-content:center;gap:8px;margin-top:40px;flex-wrap:wrap}
.list-pagination .page-numbers{display:inline-flex;min-width:42px;height:42px;align-items:center;justify-content:center;padding:0 12px;border:1px solid var(--c-line);border-radius:10px;background:#fff;font-weight:600;color:#334155}
.list-pagination .page-numbers.current{background:var(--brand-grad);color:#fff;border-color:transparent}
.list-pagination a.page-numbers:hover{border-color:var(--brand-orange);color:var(--brand-red)}

/* 404 / search empty */
.notice-block{text-align:center;max-width:620px;margin:0 auto;padding:50px 0}
.notice-block .big{font-size:5rem;font-weight:900;background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1}

/* ---------- Footer ---------- */
.site-footer{background:var(--brand-ink);color:#94a3b8;padding:58px 0 0;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:34px;padding-bottom:42px}
.site-footer h4{color:#fff;font-size:1.05rem;margin:0 0 18px}
.site-footer .foot-logo{height:42px;margin-bottom:16px}
.site-footer p{font-size:.92rem;color:#94a3b8}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer ul li{margin-bottom:10px}
.site-footer ul a{color:#cbd5e1;font-size:.93rem}
.site-footer ul a:hover{color:#fff;padding-left:4px}
.foot-contact li{display:flex;gap:10px;font-size:.92rem;margin-bottom:12px}
.social-row{display:flex;gap:10px;margin-top:18px}
.social-row a{width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:#cbd5e1;font-weight:700;font-size:.82rem}
.social-row a:hover{background:var(--brand-grad);color:#fff}
.foot-news input{width:100%;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);border-radius:10px;padding:.7em .9em;color:#fff;margin-bottom:10px}
.foot-news label{display:block;font-size:.86rem;color:#cbd5e1;margin-bottom:6px}
.comment-form label{display:block;font-weight:600;font-size:.9rem;color:var(--brand-ink);margin-bottom:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;font-size:.88rem;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.footer-bottom a{color:#cbd5e1}

.back-top{position:fixed;right:22px;bottom:22px;width:48px;height:48px;border-radius:14px;background:var(--brand-grad);color:#fff;border:0;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 8px 20px rgba(190,24,24,.3);opacity:0;visibility:hidden;transition:opacity .2s,transform .2s;z-index:150}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-3px)}

/* mobile drawer */
.mobile-drawer{position:fixed;inset:0 0 0 auto;width:84%;max-width:340px;background:#fff;z-index:400;transform:translateX(100%);transition:transform .28s;box-shadow:-10px 0 40px rgba(15,23,42,.18);padding:24px;overflow-y:auto}
.mobile-drawer.open{transform:translateX(0)}
.drawer-overlay{position:fixed;inset:0;background:rgba(15,23,42,.5);z-index:350;opacity:0;visibility:hidden;transition:opacity .25s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer .close{float:right;background:var(--c-soft);border:0;width:40px;height:40px;border-radius:10px;font-size:1.3rem;cursor:pointer}
.mobile-drawer ul{list-style:none;padding:0;margin:24px 0 0;clear:both}
.mobile-drawer ul a{display:block;padding:.8em .4em;border-bottom:1px solid var(--c-line);color:#334155;font-weight:600}

/* ---------- Responsive ---------- */
@media(max-width:1024px){
  .grid-4{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .header-search{display:none}
}
@media(max-width:880px){
  .layout{grid-template-columns:1fr}
  .main-nav{display:none}
  .menu-toggle{display:flex}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:2.1rem}
  .hero-slide{min-height:420px}
}
@media(max-width:560px){
  body{font-size:16px}
  h1{font-size:1.7rem}.hero h1{font-size:1.75rem}
  .grid-2,.grid-3,.grid-4,.archive-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .section{padding:44px 0}
  .site-topbar{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{justify-content:center;text-align:center}
  .hero-content{padding:40px 0}
  .cta-banner h2{font-size:1.5rem}
}


/* KIRA_LOGO_REFRESH_START */
.site-logo img,.navbar-brand img,.custom-logo-link img,img.custom-logo{height:75px!important;width:auto!important;max-width:min(300px,48vw)!important;object-fit:contain!important;}
.site-footer img.flogo,footer img[src*='logo-light-kira-'],footer img[src*='logo-light.png']{height:69px!important;width:auto!important;max-width:min(290px,55vw)!important;object-fit:contain!important;}
@media(max-width:680px){.site-logo img,.navbar-brand img,.custom-logo-link img,img.custom-logo{height:58px!important;max-width:62vw!important}.site-footer img.flogo,footer img[src*='logo-light-kira-'],footer img[src*='logo-light.png']{height:54px!important;max-width:70vw!important}}
/* KIRA_LOGO_REFRESH_END */