/*
Theme Name: DiffCoin
Theme URI: https://diffcoin.com/
Author: DiffCoin
Author URI: https://diffcoin.com
Description: Ultra-light, responsive, mobile-first theme for a cryptocurrency news magazine. Optimized for SEO and Core Web Vitals. Left-to-right (LTR), English-ready.
Version: 1.0.0
Requires at least: 6.2
Tested up to: 6.7
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: diffcoin
Tags: news, magazine, cryptocurrency, blog, responsive-layout, custom-menu, featured-images, threaded-comments, translation-ready
*/

/* ===== Design Tokens ===== */
:root{
  --bg:#0a0e17;
  --bg-elev:#0f1626;
  --bg-card:#111a2e;
  --border:#1d2942;
  --text:#e7ecf5;
  --text-dim:#9aa7c2;
  --text-mute:#64718f;
  --accent:#00e0c6;
  --accent-2:#3b82f6;
  --accent-glow:rgba(0,224,198,.35);
  --danger:#ff4d6d;
  --radius:14px;
  --radius-sm:9px;
  --maxw:1240px;
  --gap:22px;
  --font:"Inter",-apple-system,"Segoe UI",Tahoma,sans-serif;
  --shadow:0 8px 30px rgba(0,0,0,.45);
  --tr:.25s cubic-bezier(.4,0,.2,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;
  background-image:
    radial-gradient(900px 500px at 85% -10%,rgba(59,130,246,.10),transparent 60%),
    radial-gradient(700px 400px at -10% 0%,rgba(0,224,198,.08),transparent 55%);
  background-attachment:fixed;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color var(--tr)}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 18px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ===== Skip link / a11y ===== */
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--accent);color:#001;padding:8px 14px;border-radius:8px;z-index:1000}
.skip-link:focus{left:8px}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:200;backdrop-filter:blur(14px);background:rgba(10,14,23,.82);border-bottom:1px solid var(--border)}
.header-top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
.site-brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:1.45rem;letter-spacing:-.5px}
.brand-name b{color:var(--accent)}
.header-actions{display:flex;align-items:center;gap:10px}
.icon-btn{width:42px;height:42px;border-radius:11px;border:1px solid var(--border);background:var(--bg-elev);color:var(--text);display:grid;place-items:center;cursor:pointer;transition:var(--tr)}
.icon-btn:hover{border-color:var(--accent);color:var(--accent)}

/* ===== Nav ===== */
.main-nav{border-top:1px solid var(--border)}
.main-nav .menu,
.main-nav > div > ul{display:flex;flex-wrap:wrap;gap:2px;position:relative}
.main-nav li{position:relative}
.main-nav a{display:flex;align-items:center;gap:5px;padding:13px 16px;font-weight:600;font-size:.95rem;color:var(--text-dim);position:relative;white-space:nowrap}
.main-nav a:hover,.main-nav .current-menu-item>a,.main-nav .current-menu-ancestor>a{color:var(--accent)}
.main-nav > div > ul > li > a::after{content:"";position:absolute;bottom:0;right:16px;left:16px;height:2px;background:var(--accent);transform:scaleX(0);transition:transform var(--tr);box-shadow:0 0 10px var(--accent-glow)}
.main-nav > div > ul > li:hover > a::after,.main-nav > div > ul > li.current-menu-item > a::after{transform:scaleX(1)}

/* Submenu caret */
.main-nav .menu-item-has-children > a::before{
  content:"";width:7px;height:7px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;
  transform:rotate(45deg);margin-top:-3px;opacity:.7;transition:transform var(--tr);order:2;
}
.main-nav .menu-item-has-children:hover > a::before{transform:rotate(-135deg);margin-top:2px}

/* Dropdown submenu */
.main-nav .sub-menu{
  position:absolute;top:100%;left:0;min-width:220px;
  background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius-sm);
  box-shadow:var(--shadow);padding:7px;z-index:300;
  display:flex;flex-direction:column;gap:1px;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--tr),transform var(--tr),visibility var(--tr);
}
.main-nav li:hover > .sub-menu,
.main-nav li:focus-within > .sub-menu{opacity:1;visibility:visible;transform:translateY(0)}
.main-nav .sub-menu li{width:100%}
.main-nav .sub-menu a{padding:10px 13px;border-radius:9px;font-size:.9rem;font-weight:500}
.main-nav .sub-menu a::after{display:none}
.main-nav .sub-menu a:hover{background:var(--bg-card);color:var(--accent)}
.main-nav .sub-menu .menu-item-has-children > a::before{transform:rotate(-45deg)}

/* Third-level submenu (opens to the right in LTR) */
.main-nav .sub-menu .sub-menu{top:-8px;left:auto;right:100%;transform:translateX(8px)}
.main-nav .sub-menu li:hover > .sub-menu{transform:translateX(0)}

.nav-toggle{display:none}

/* ===== Search bar ===== */
.search-panel{max-height:0;overflow:hidden;transition:max-height var(--tr)}
.search-panel.open{max-height:120px}
.search-panel form{display:flex;gap:8px;padding:14px 0}
.search-panel input{flex:1;background:var(--bg-elev);border:1px solid var(--border);border-radius:11px;padding:12px 16px;color:var(--text);font-family:var(--font);font-size:1rem}
.search-panel input:focus{outline:none;border-color:var(--accent)}
.search-panel button{background:var(--accent);color:#001;border:none;border-radius:11px;padding:0 22px;font-weight:700;cursor:pointer;font-family:var(--font)}

/* ===== Section heading ===== */
.section-head{display:flex;align-items:center;justify-content:space-between;margin:38px 0 20px}
.section-head h2{font-size:1.4rem;font-weight:800;display:flex;align-items:center;gap:11px}
.section-head h2::before{content:"";width:6px;height:24px;border-radius:4px;background:linear-gradient(var(--accent),var(--accent-2))}
.section-head .more{font-size:.88rem;color:var(--text-dim);font-weight:600}
.section-head .more:hover{color:var(--accent)}

/* ===== Card grid ===== */
.grid{display:grid;gap:var(--gap)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}

.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform var(--tr),border-color var(--tr),box-shadow var(--tr)}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:var(--shadow)}
.card-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg-elev)}
.card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.card:hover .card-thumb img{transform:scale(1.06)}
.card-cat{position:absolute;top:10px;right:10px;background:var(--accent);color:#001;font-size:.72rem;font-weight:800;padding:5px 11px;border-radius:8px}
.card-body{padding:16px 17px 18px;display:flex;flex-direction:column;flex:1;gap:9px}
.card-title{font-size:1.06rem;font-weight:700;line-height:1.55}
.card-title a:hover{color:var(--accent)}
.card-meta{display:flex;gap:13px;font-size:.78rem;color:var(--text-mute);margin-top:auto}
.card-meta span{display:flex;align-items:center;gap:5px}
.card-excerpt{font-size:.9rem;color:var(--text-dim);line-height:1.7}

/* ===== Hero / featured ===== */
.hero{display:grid;grid-template-columns:1.6fr 1fr;gap:var(--gap);margin-top:26px}
.hero-main{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:16/10;min-height:340px}
.hero-main img{width:100%;height:100%;object-fit:cover}
.hero-main .overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(7,10,18,.95) 8%,transparent 70%);display:flex;flex-direction:column;justify-content:flex-end;padding:30px}
.hero-main h2{font-size:1.9rem;font-weight:800;line-height:1.45;margin-top:12px}
.hero-side{display:flex;flex-direction:column;gap:var(--gap)}
.hero-side .card{flex-direction:row}
.hero-side .card-thumb{width:42%;aspect-ratio:1;flex-shrink:0}
.hero-side .card-body{padding:13px 14px}
.hero-side .card-title{font-size:.98rem}

/* ===== List item (sidebar/archive small) ===== */
.tlist{display:flex;flex-direction:column;gap:15px}
.tlist-item{display:flex;gap:13px;align-items:flex-start}
.tlist-num{font-size:1.5rem;font-weight:900;color:var(--accent);opacity:.5;line-height:1;min-width:30px}
.tlist-item .t{font-size:.94rem;font-weight:600;line-height:1.6}
.tlist-item .t a:hover{color:var(--accent)}
.tlist-item small{color:var(--text-mute);font-size:.76rem}

/* ===== Single post ===== */
.single-wrap{display:grid;grid-template-columns:1fr 320px;gap:36px;margin-top:30px}
.post-head h1{font-size:2.1rem;font-weight:800;line-height:1.5;margin-bottom:16px}
.post-meta{display:flex;flex-wrap:wrap;gap:16px;color:var(--text-mute);font-size:.85rem;padding-bottom:18px;border-bottom:1px solid var(--border);margin-bottom:22px}
.post-meta span{display:flex;align-items:center;gap:6px}
.post-feat{border-radius:var(--radius);overflow:hidden;margin-bottom:26px}
.post-content{font-size:1.06rem;line-height:2}
.post-content p{margin:0 0 22px}
.post-content h2,.post-content h3{margin:34px 0 16px;font-weight:800}
.post-content h2{font-size:1.5rem}
.post-content h3{font-size:1.25rem}
.post-content a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.post-content img{border-radius:var(--radius);margin:22px 0}
.post-content blockquote{border-left:4px solid var(--accent);background:var(--bg-elev);padding:16px 22px;border-radius:var(--radius-sm);margin:22px 0;color:var(--text-dim)}
.post-content ul,.post-content ol{margin:0 0 22px;padding-left:24px}
.post-content li{margin-bottom:9px}
.post-content code{background:var(--bg-elev);padding:2px 7px;border-radius:6px;font-size:.9em;color:var(--accent)}
.post-content pre{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px;overflow:auto;margin:22px 0;direction:ltr;text-align:left}

.post-tags{display:flex;flex-wrap:wrap;gap:8px;margin:28px 0}
.post-tags a{background:var(--bg-elev);border:1px solid var(--border);padding:6px 13px;border-radius:20px;font-size:.82rem;color:var(--text-dim)}
.post-tags a:hover{border-color:var(--accent);color:var(--accent)}

/* ===== Sidebar ===== */
.sidebar .widget{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:24px}
.sidebar .widget-title{font-size:1.08rem;font-weight:800;margin-bottom:16px;display:flex;align-items:center;gap:9px}
.sidebar .widget-title::before{content:"";width:5px;height:18px;border-radius:3px;background:var(--accent)}
.sidebar ul li{padding:9px 0;border-bottom:1px solid var(--border);font-size:.92rem}
.sidebar ul li:last-child{border-bottom:none}
.sidebar a:hover{color:var(--accent)}

/* ===== Pagination ===== */
.pagination{display:flex;justify-content:center;gap:8px;margin:42px 0;flex-wrap:wrap}
.pagination a,.pagination span{min-width:44px;height:44px;display:grid;place-items:center;border-radius:11px;border:1px solid var(--border);background:var(--bg-elev);font-weight:700;padding:0 12px}
.pagination .current{background:var(--accent);color:#001;border-color:var(--accent)}
.pagination a:hover{border-color:var(--accent);color:var(--accent)}

/* ===== Comments ===== */
.comments-area{margin-top:46px}
.comment-list{list-style:none}
.comment-body{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:16px}
.comment-author{font-weight:700;margin-bottom:6px}
.comment-meta{font-size:.78rem;color:var(--text-mute);margin-bottom:10px}
.comment-form{display:grid;gap:14px;margin-top:20px}
.comment-form input,.comment-form textarea{background:var(--bg-elev);border:1px solid var(--border);border-radius:11px;padding:12px 15px;color:var(--text);font-family:var(--font);font-size:1rem;width:100%}
.comment-form input:focus,.comment-form textarea:focus{outline:none;border-color:var(--accent)}
.comment-form .submit{background:var(--accent);color:#001;border:none;border-radius:11px;padding:13px 28px;font-weight:800;cursor:pointer;font-family:var(--font);width:fit-content}

/* ===== Footer ===== */
.site-footer{margin-top:60px;border-top:1px solid var(--border);background:var(--bg-elev)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1.3fr 1.1fr;gap:40px;padding:50px 0}
.footer-col h3{font-size:1.02rem;font-weight:800;margin-bottom:18px;position:relative;padding-bottom:10px}
.footer-col h3::after{content:"";position:absolute;bottom:0;left:0;width:32px;height:2px;background:var(--accent);border-radius:2px}
.footer-col p{color:var(--text-dim);font-size:.92rem;line-height:1.85}
.footer-brand .site-brand{font-size:1.3rem}
.footer-links li{padding:7px 0}
.footer-links a{color:var(--text-dim);font-size:.92rem;display:inline-flex;align-items:center;gap:7px;transition:var(--tr)}
.footer-links a::before{content:"›";color:var(--accent);font-weight:800}
.footer-links a:hover{color:var(--accent);transform:translateX(3px)}

.footer-recent{display:flex;flex-direction:column;gap:14px}
.footer-recent a{display:flex;flex-direction:column;gap:3px}
.footer-recent .fr-title{color:var(--text-dim);font-size:.9rem;font-weight:600;line-height:1.6;transition:var(--tr)}
.footer-recent a:hover .fr-title{color:var(--accent)}
.footer-recent .fr-date{color:var(--text-mute);font-size:.76rem}

.footer-social{display:flex;gap:10px;margin-top:20px}
.social-link{width:40px;height:40px;border-radius:11px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-dim);display:grid;place-items:center;transition:var(--tr)}
.social-link:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-3px)}

.footer-newsletter{display:flex;gap:8px}
.footer-newsletter input{flex:1;min-width:0;background:var(--bg-card);border:1px solid var(--border);border-radius:11px;padding:11px 14px;color:var(--text);font-family:var(--font);font-size:.92rem}
.footer-newsletter input:focus{outline:none;border-color:var(--accent)}
.footer-newsletter button{background:var(--accent);color:#001;border:none;border-radius:11px;padding:0 18px;font-weight:800;cursor:pointer;font-family:var(--font);white-space:nowrap}

.footer-bottom{border-top:1px solid var(--border);padding:18px 0;color:var(--text-mute);font-size:.84rem}
.footer-bottom-inner{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.footer-built{color:var(--text-mute)}
.footer-built::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-right:7px;vertical-align:middle;box-shadow:0 0 8px var(--accent-glow)}

/* ===== Brand mark (SVG logo) ===== */
.brand-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:grid;place-items:center;padding:0;box-shadow:0 0 24px var(--accent-glow);overflow:hidden}
.brand-mark svg{width:100%;height:100%}

/* ===== Back to top ===== */
.back-to-top{position:fixed;bottom:22px;right:22px;width:46px;height:46px;border-radius:13px;border:1px solid var(--border);background:var(--bg-card);color:var(--accent);display:grid;place-items:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:var(--tr);z-index:150;box-shadow:var(--shadow)}
.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{border-color:var(--accent);box-shadow:0 0 20px var(--accent-glow)}

/* ===== Breadcrumb ===== */
.breadcrumb{font-size:.84rem;color:var(--text-mute);margin:20px 0 4px;display:flex;gap:8px;flex-wrap:wrap}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{opacity:.5}

/* ===== Page title ===== */
.archive-head{margin:26px 0 6px}
.archive-head h1{font-size:1.9rem;font-weight:800}
.archive-head .desc{color:var(--text-dim);margin-top:8px}

/* ===== Mobile menu drawer ===== */
.mobile-drawer{position:fixed;inset:0;z-index:500;visibility:hidden;opacity:0;transition:var(--tr)}
.mobile-drawer.open{visibility:visible;opacity:1}
.mobile-drawer .backdrop{position:absolute;inset:0;background:rgba(0,0,0,.6)}
.mobile-drawer .panel{position:absolute;top:0;right:0;bottom:0;width:min(82%,330px);background:var(--bg-elev);border-left:1px solid var(--border);padding:22px;transform:translateX(100%);transition:transform var(--tr);overflow-y:auto}
.mobile-drawer.open .panel{transform:translateX(0)}
.mobile-drawer .panel ul{display:flex;flex-direction:column;gap:2px;margin-top:18px}
.mobile-drawer .panel a{display:block;padding:13px 12px;border-radius:11px;font-weight:600;color:var(--text-dim)}
.mobile-drawer .panel a:hover{background:var(--bg-card);color:var(--accent)}

/* Mobile submenu accordion */
.mobile-drawer .menu-item-has-children{position:relative}
.mobile-drawer .submenu-toggle{
  position:absolute;top:4px;right:0;width:42px;height:42px;border:none;background:transparent;
  color:var(--text-dim);cursor:pointer;display:grid;place-items:center;border-radius:11px;
}
.mobile-drawer .submenu-toggle::before{
  content:"";width:8px;height:8px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;
  transform:rotate(45deg);transition:transform var(--tr);
}
.mobile-drawer .menu-item-has-children.open > .submenu-toggle{color:var(--accent)}
.mobile-drawer .menu-item-has-children.open > .submenu-toggle::before{transform:rotate(-135deg)}
.mobile-drawer .sub-menu{
  max-height:0;overflow:hidden;margin:0;padding-left:16px;gap:0;
  transition:max-height var(--tr);border-left:2px solid var(--border);
}
.mobile-drawer .menu-item-has-children.open > .sub-menu{max-height:600px}
.mobile-drawer .sub-menu a{font-size:.9rem;font-weight:500;padding:11px 12px}
.drawer-close{width:42px;height:42px;border-radius:11px;border:1px solid var(--border);background:var(--bg-card);color:var(--text);cursor:pointer}

/* ===== Responsive (mobile-first priority) ===== */
@media(max-width:1024px){
  .grid-4{grid-template-columns:repeat(3,1fr)}
  .single-wrap{grid-template-columns:1fr;gap:30px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .main-nav{display:none}
  .nav-toggle{display:grid}
  .hero{grid-template-columns:1fr}
  .hero-main{min-height:260px;aspect-ratio:16/11}
  .hero-main h2{font-size:1.4rem}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .section-head h2{font-size:1.2rem}
  .post-head h1{font-size:1.55rem}
  .post-content{font-size:1rem}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px;padding:36px 0}
  .footer-bottom-inner{flex-direction:column;text-align:center;gap:8px}
  .back-to-top{bottom:16px;right:16px;width:42px;height:42px}
}
@media(max-width:480px){
  .grid-3,.grid-4,.grid-2{grid-template-columns:1fr}
  .hero-side .card{flex-direction:column}
  .hero-side .card-thumb{width:100%;aspect-ratio:16/9}
  .site-brand{font-size:1.2rem}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{text-align:center}
  .footer-brand .site-brand{justify-content:center}
  .footer-social{justify-content:center}
  .footer-col h3::after{right:50%;transform:translateX(50%)}
  .footer-col{text-align:center}
  .footer-links a{justify-content:center}
  .card-title{font-size:1rem}
}

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

/* ===== WordPress core element styles (LTR) ===== */
.alignright{float:right;margin:0 0 1em 1.5em}
.alignleft{float:left;margin:0 1.5em 1em 0}
.aligncenter{display:block;margin-left:auto;margin-right:auto}
.page-links{margin:20px 0}
.page-links a,.page-links>span{display:inline-grid;place-items:center;min-width:38px;height:38px;border:1px solid var(--border);border-radius:9px;margin-right:6px}
.comment-list .children{margin-left:28px;list-style:none}
.bypostauthor{display:block}
.screen-reader-text,.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ===== Most Viewed section ===== */
.popular-block .section-head h2::before{background:linear-gradient(var(--accent-2),var(--accent))}
.popular-card .card-thumb{position:relative}
.rank-badge{
  position:absolute;top:10px;left:10px;z-index:2;
  width:30px;height:30px;display:grid;place-items:center;
  font-size:.95rem;font-weight:900;color:#001;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  border-radius:9px;box-shadow:0 4px 14px var(--accent-glow);
}
.views-meta{display:inline-flex;align-items:center;gap:5px}
.views-meta svg{flex:none;opacity:.8}