/* TechEarths Theme - main.css v2.1 */
:root{
  --ac:#0057ff;--acd:#003db3;--or:#f04e23;--gn:#0a8a4f;--pu:#6d28d9;
  --bg:#f8fafc;--sf:#fff;--sf2:#f1f5f9;--bd:#e2e8f0;
  --tx:#0f172a;--mu:#64748b;
  --fh:'Syne',sans-serif;--fb:'Nunito Sans',sans-serif;
  --mw:1200px;--rs:6px;--rm:10px;--rl:14px;
  --ss:0 1px 3px rgba(0,0,0,.06);--sh:0 8px 24px rgba(0,0,0,.10);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--fb);background:var(--bg);color:var(--tx);line-height:1.65;font-size:15px}
img{max-width:100%;display:block;object-fit:cover}
a{text-decoration:none;color:inherit;transition:color .2s}
ul{list-style:none}
button{font-family:var(--fb);cursor:pointer;border:none;background:none}
.wrap{max-width:var(--mw);margin:0 auto;padding:0 20px}

/* TOPBAR */
.topbar{background:var(--ac);overflow:hidden;padding:7px 0}
.tk-track{display:flex;width:max-content;animation:tk 38s linear infinite}
.tk-track:hover{animation-play-state:paused}
.tk-item{display:flex;align-items:center;gap:18px;padding:0 28px;font-family:var(--fh);font-size:11px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;color:#fff;white-space:nowrap}
.tk-item .d{width:5px;height:5px;background:rgba(255,255,255,.4);border-radius:50%;flex-shrink:0}
@keyframes tk{to{transform:translateX(-50%)}}

/* ══════════════════════════════
   DESKTOP HEADER (always visible)
══════════════════════════════ */
.site-header{background:var(--sf);border-bottom:1px solid var(--bd);position:sticky;top:0;z-index:900;box-shadow:var(--ss)}
.hdr-row{display:flex;align-items:center;justify-content:center;padding:18px 20px 14px;position:relative}
.site-logo{display:flex;flex-direction:column;align-items:center;gap:3px}
.logo-mark{font-family:var(--fh);font-size:36px;font-weight:800;letter-spacing:-2px;line-height:1;display:flex;align-items:center;gap:2px}
.logo-mark .lt{color:var(--tx)}
.logo-mark .le{color:var(--ac)}
.logo-mark .ld{width:9px;height:9px;background:var(--or);border-radius:50%;margin-bottom:6px;margin-left:1px;flex-shrink:0}
.logo-sub{font-family:var(--fb);font-size:10px;font-weight:600;letter-spacing:4px;text-transform:uppercase;color:var(--mu)}
.hdr-search{position:absolute;left:20px;display:flex;align-items:center;gap:8px;background:var(--sf2);border:1px solid var(--bd);border-radius:var(--rs);padding:8px 13px;color:var(--mu);font-size:13px;font-weight:600;transition:all .2s}
.hdr-search:hover{border-color:var(--ac);color:var(--ac)}
.hdr-search svg{width:14px;height:14px;flex-shrink:0}
.hdr-search .kbd{font-size:10px;background:var(--sf2);border:1px solid var(--bd);border-radius:3px;padding:1px 5px;color:var(--mu)}
.hdr-sub{position:absolute;right:20px;background:var(--ac);color:#fff;border-radius:var(--rs);padding:8px 18px;font-size:13px;font-weight:700;transition:background .2s}
.hdr-sub:hover{background:var(--acd)}
.pri-nav{border-top:1px solid var(--bd)}
.pri-nav ul{display:flex;justify-content:center;align-items:center;overflow-x:auto;scrollbar-width:none}
.pri-nav ul::-webkit-scrollbar{display:none}
.pri-nav ul li a{display:block;padding:11px 15px;font-family:var(--fh);font-size:13px;font-weight:700;color:var(--mu);border-bottom:2px solid transparent;white-space:nowrap;transition:all .2s}
.pri-nav ul li a:hover,.pri-nav ul li a.current-menu-item{color:var(--ac);border-bottom-color:var(--ac)}

/* ══════════════════════════════
   MOBILE HEADER — hidden on desktop
══════════════════════════════ */
.mob-header{display:none}

/* ══════════════════════════════
   MOBILE PANEL + OVERLAY
   Always hidden by default (display:none).
   Only .open class makes them visible.
   z-index higher than everything so panel
   sits on top of page content — NOT header.
══════════════════════════════ */
.mob-overlay{
  display:none;
  position:fixed;inset:0;
  background:rgba(0,0,0,.55);
  z-index:1100;
  backdrop-filter:blur(2px);
}
.mob-overlay.open{display:block}

.mob-panel{
  display:block; /* always in DOM but off-screen */
  position:fixed;
  top:0;left:0;
  width:280px;height:100%;
  background:var(--sf);
  z-index:1200;
  overflow-y:auto;
  transform:translateX(-100%);
  transition:transform .28s ease;
  box-shadow:4px 0 28px rgba(0,0,0,.15);
}
.mob-panel.open{transform:translateX(0)}

.mp-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--bd)}
.mp-head .logo-mark{font-size:22px}
.mp-close{width:32px;height:32px;border-radius:50%;background:var(--sf2);border:1px solid var(--bd);display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--mu);cursor:pointer}
.mp-links{padding:12px 0}
.mp-link{display:flex;align-items:center;justify-content:space-between;padding:13px 20px;font-family:var(--fh);font-size:14px;font-weight:700;color:var(--tx);border-bottom:1px solid var(--sf2);transition:all .2s;text-decoration:none}
.mp-link:hover{color:var(--ac);background:var(--sf2)}
.mp-arr{font-size:14px;color:var(--mu);flex-shrink:0}
.mp-foot{padding:20px;border-top:1px solid var(--bd)}
.mp-sub-big{width:100%;background:var(--ac);color:#fff;border-radius:var(--rs);padding:12px;font-family:var(--fh);font-size:14px;font-weight:800;text-align:center;cursor:pointer;border:none}

/* ══════════════════════════════
   DESKTOP SEARCH OVERLAY
══════════════════════════════ */
.s-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:9999;backdrop-filter:blur(4px)}
.s-overlay.open{display:flex;align-items:flex-start;justify-content:center;padding-top:80px}
.s-box{background:var(--sf);border-radius:var(--rl);width:min(640px,94vw);overflow:hidden;box-shadow:var(--sh)}
.s-row{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--bd)}
.s-row svg{width:18px;height:18px;color:var(--mu);flex-shrink:0}
.s-row input{flex:1;border:none;outline:none;font-family:var(--fb);font-size:16px;color:var(--tx);background:transparent}
.s-row input::placeholder{color:var(--mu)}
.s-esc{background:var(--sf2);border:1px solid var(--bd);border-radius:5px;padding:4px 10px;font-size:12px;font-weight:600;color:var(--mu)}
.s-hits{padding:8px 0;max-height:320px;overflow-y:auto}
.s-hit{display:flex;align-items:center;gap:14px;padding:11px 20px;cursor:pointer;transition:background .15s;text-decoration:none;color:inherit}
.s-hit:hover{background:var(--sf2)}
.s-icon{width:34px;height:34px;border-radius:var(--rs);display:flex;align-items:center;justify-content:center;font-family:var(--fh);font-size:11px;font-weight:700;flex-shrink:0}
.ib{background:#e8efff;color:var(--ac)}.io{background:#fff1ed;color:var(--or)}.ig{background:#e6f5ee;color:var(--gn)}.ip{background:#f0ebff;color:var(--pu)}
.s-title{font-family:var(--fh);font-size:14px;font-weight:700;color:var(--tx)}
.s-sub{font-size:11px;color:var(--mu);margin-top:2px}
.s-foot{padding:10px 20px;border-top:1px solid var(--bd);font-size:12px;color:var(--mu)}

/* HERO */
.hero{padding:28px 0 36px}
.hero-grid{display:grid;grid-template-columns:1.65fr 1fr;gap:20px}
.hero-main{background:var(--sf);border:1px solid var(--bd);border-radius:var(--rl);overflow:hidden;box-shadow:var(--ss);display:flex;flex-direction:column;transition:box-shadow .2s}
.hero-main:hover{box-shadow:var(--sh)}
.hero-img{width:100%;aspect-ratio:16/9;background:linear-gradient(135deg,#c8d4e8,#dde5f0);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.hero-img img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.hero-ph{font-family:var(--fh);font-size:72px;font-weight:800;color:rgba(255,255,255,.35);letter-spacing:-3px;position:relative;z-index:1}
.hero-badge{position:absolute;top:14px;left:14px;background:var(--ac);color:#fff;font-family:var(--fh);font-size:10px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;padding:4px 11px;border-radius:4px;z-index:2}
.hero-body{padding:24px 26px 26px;display:flex;flex-direction:column;flex:1}
.hero-cat{font-family:var(--fh);font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--ac);margin-bottom:10px}
.hero-cat a{color:var(--ac)}
.hero-title{font-family:var(--fh);font-size:25px;font-weight:800;line-height:1.22;letter-spacing:-.5px;margin-bottom:12px}
.hero-title a:hover{color:var(--ac)}
.hero-exc{font-size:15px;color:var(--mu);line-height:1.7;margin-bottom:18px;flex:1}
.hero-foot{display:flex;align-items:center;justify-content:space-between}
.hero-meta{font-size:12px;color:var(--mu)}
.read-btn{display:inline-flex;align-items:center;gap:6px;background:var(--ac);color:#fff;font-family:var(--fh);font-size:12px;font-weight:700;padding:9px 18px;border-radius:var(--rs);transition:background .2s}
.read-btn:hover{background:var(--acd);color:#fff}
.hero-side{display:flex;flex-direction:column;gap:13px}
.side-card{display:flex;gap:13px;background:var(--sf);border:1px solid var(--bd);border-radius:var(--rm);padding:13px;box-shadow:var(--ss);transition:all .2s}
.side-card:hover{border-color:var(--ac);box-shadow:var(--sh);transform:translateX(3px)}
.side-thumb{width:88px;height:76px;background:linear-gradient(135deg,#dde5f0,#c8d4e8);border-radius:var(--rs);flex-shrink:0;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.side-thumb img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.side-ph{font-family:var(--fh);font-size:18px;font-weight:800;color:rgba(100,116,139,.4);position:relative;z-index:1}
.side-body{display:flex;flex-direction:column;justify-content:center;gap:5px}
.side-cat{font-family:var(--fh);font-size:10px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--ac)}
.side-title{font-family:var(--fh);font-size:14px;font-weight:700;line-height:1.35;color:var(--tx)}
.side-title:hover{color:var(--ac)}
.side-date{font-size:11px;color:var(--mu)}

/* CATEGORY SECTIONS */
.cat-sec{margin-bottom:48px}
.cat-hdr{display:flex;align-items:center;justify-content:space-between;border-bottom:2px solid var(--bd);padding-bottom:10px;margin-bottom:20px;position:relative}
.cat-hdr::after{content:'';position:absolute;bottom:-2px;left:0;width:80px;height:2px;background:var(--cc,var(--ac))}
.cat-name{font-family:var(--fh);font-size:20px;font-weight:800;letter-spacing:-.5px;display:flex;align-items:center;gap:10px}
.cat-bar{width:4px;height:22px;border-radius:2px;background:var(--cc,var(--ac));flex-shrink:0}
.cat-more{font-family:var(--fh);font-size:11px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--cc,var(--ac));transition:letter-spacing .2s}
.cat-more:hover{letter-spacing:1.5px}
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cat-card{background:var(--sf);border:1px solid var(--bd);border-radius:var(--rm);overflow:hidden;display:flex;flex-direction:column;transition:all .2s;box-shadow:var(--ss)}
.cat-card:hover{transform:translateY(-3px);box-shadow:var(--sh);border-color:transparent}
.cat-img{aspect-ratio:16/9;background:linear-gradient(135deg,#dde5f0,#c8d4e8);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.cat-img img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.cat-ph{font-family:var(--fh);font-size:26px;font-weight:800;color:rgba(100,116,139,.25);position:relative;z-index:1}
.cat-body{padding:14px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.cat-date{font-size:11px;color:var(--mu)}
.cat-ttl{font-family:var(--fh);font-size:15px;font-weight:700;line-height:1.4}
.cat-ttl a:hover{color:var(--ac)}
.cat-exc{font-size:13px;color:var(--mu);line-height:1.6}

/* NEWSLETTER */
.nl-strip{background:var(--ac);padding:40px 0;margin-bottom:48px;position:relative;overflow:hidden}
.nl-strip::before{content:'';position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;background:rgba(255,255,255,.07)}
.nl-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;position:relative;z-index:1}
.nl-ey{font-family:var(--fh);font-size:11px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;color:rgba(255,255,255,.6);margin-bottom:6px}
.nl-ttl{font-family:var(--fh);font-size:24px;font-weight:800;color:#fff;letter-spacing:-.5px;line-height:1.2}
.nl-sub{font-size:14px;color:rgba(255,255,255,.75);margin-top:6px}
.nl-form{display:flex;gap:8px;flex-shrink:0}
.nl-input{background:rgba(255,255,255,.15);border:1.5px solid rgba(255,255,255,.25);border-radius:var(--rs);padding:11px 18px;font-family:var(--fb);font-size:14px;color:#fff;width:220px;outline:none}
.nl-input::placeholder{color:rgba(255,255,255,.5)}
.nl-input:focus{border-color:rgba(255,255,255,.6)}
.nl-btn{background:#fff;color:var(--ac);border-radius:var(--rs);padding:11px 22px;font-family:var(--fh);font-size:13px;font-weight:800;transition:all .2s}
.nl-btn:hover{background:#f0f4ff}

/* FOOTER */
.site-footer{background:#0f172a;border-top:4px solid var(--ac)}
.ft-cols{display:grid;grid-template-columns:1fr 1fr 1fr;gap:48px;padding:52px 0 44px}
.ft-col{display:flex;flex-direction:column}
.ft-lbl{font-family:var(--fh);font-size:10px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;color:rgba(255,255,255,.28);border-bottom:1px solid rgba(255,255,255,.07);padding-bottom:12px;margin-bottom:18px}
.ft-logo{font-family:var(--fh);font-size:26px;font-weight:800;letter-spacing:-1.5px;color:#fff;margin-bottom:4px;display:flex;align-items:center;gap:2px}
.ft-logo .le{color:#60a5fa}
.ft-logo .ld{width:7px;height:7px;background:var(--or);border-radius:50%;margin-bottom:4px;flex-shrink:0}
.ft-tag{font-size:10px;font-weight:600;letter-spacing:3px;text-transform:uppercase;color:rgba(255,255,255,.2);margin-bottom:14px}
.ft-about{font-size:13px;line-height:1.8;color:rgba(255,255,255,.45);flex:1}
.ft-socs{display:flex;gap:8px;margin-top:18px}
.ft-soc{width:34px;height:34px;border-radius:var(--rs);border:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;font-family:var(--fh);font-size:11px;font-weight:700;color:rgba(255,255,255,.35);background:transparent;transition:all .2s;cursor:pointer}
.ft-soc:hover{border-color:#60a5fa;color:#60a5fa}
.ft-posts{display:flex;flex-direction:column;flex:1}
.ft-post{display:flex;align-items:flex-start;gap:12px;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.05);text-decoration:none;color:inherit}
.ft-post:last-child{border-bottom:none}
.ft-pn{font-family:var(--fh);font-size:20px;font-weight:800;color:rgba(255,255,255,.1);line-height:1.2;min-width:26px;flex-shrink:0}
.ft-pt{font-family:var(--fh);font-size:13px;font-weight:700;color:rgba(255,255,255,.65);line-height:1.5;transition:color .2s}
.ft-post:hover .ft-pt{color:#60a5fa}
.ft-pages{display:flex;flex-direction:column;flex:1}
.ft-pg{display:flex;align-items:center;gap:10px;padding:12px 10px;border-radius:6px;font-size:13px;font-weight:600;color:rgba(255,255,255,.5);transition:all .2s;border-bottom:1px solid rgba(255,255,255,.04);text-decoration:none}
.ft-pg:last-child{border-bottom:none}
.ft-pg:hover{background:rgba(255,255,255,.05);color:#fff;padding-left:16px}
.ft-arr{font-size:13px;color:rgba(255,255,255,.18);transition:color .2s;flex-shrink:0}
.ft-pg:hover .ft-arr{color:#60a5fa}
.ft-copy-row{border-top:1px solid rgba(255,255,255,.06);padding:18px 0;text-align:center}
.ft-copy{font-size:13px;color:rgba(255,255,255,.22)}
.ft-copy strong{color:rgba(255,255,255,.38);font-weight:700}

/* ══════════════════════════════
   RESPONSIVE — TABLET (≤1024px)
══════════════════════════════ */
@media(max-width:1024px){
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1fr}
  .hero-side{display:grid;grid-template-columns:repeat(2,1fr)}
  .ft-cols{grid-template-columns:1fr;gap:28px;padding:36px 0 28px}
}

/* ══════════════════════════════
   RESPONSIVE — MOBILE (≤768px)
   Desktop header hidden.
   Mobile header shown.
══════════════════════════════ */
@media(max-width:768px){
  /* Swap headers */
  .site-header{display:none !important}
  .mob-header{
    display:block;
    background:var(--sf);
    border-bottom:1px solid var(--bd);
    position:sticky;
    top:0;
    z-index:900;
    box-shadow:var(--ss);
  }

  /* Top row: hamburger | logo | spacer */
  .mh-top{display:flex;align-items:center;padding:12px 16px;gap:12px}
  .hamburger{
    display:flex;flex-direction:column;gap:5px;
    width:36px;height:36px;
    align-items:center;justify-content:center;
    background:var(--sf2);border:1px solid var(--bd);
    border-radius:var(--rs);flex-shrink:0;
  }
  .hamburger span{display:block;width:18px;height:2px;background:var(--tx);border-radius:2px;transition:all .25s}
  .hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .hamburger.open span:nth-child(2){opacity:0}
  .hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .mh-logo{flex:1;text-align:center}
  .mh-logo .logo-mark{font-size:26px;justify-content:center}
  .mh-logo .logo-sub{font-size:8px;letter-spacing:3px}
  .mh-spacer{width:36px;flex-shrink:0}

  /* Search bar row */
  .mh-search{padding:0 16px 10px}
  .mh-search form{display:flex;align-items:center;gap:10px;background:var(--sf2);border:1px solid var(--bd);border-radius:var(--rs);padding:9px 14px}
  .mh-search svg{width:15px;height:15px;color:var(--mu);flex-shrink:0}
  .mh-search input{flex:1;border:none;background:transparent;outline:none;font-family:var(--fb);font-size:14px;color:var(--tx)}
  .mh-search input::placeholder{color:var(--mu)}

  /* Nav scroll row */
  .mh-nav-row{overflow-x:auto;scrollbar-width:none;border-top:1px solid var(--bd);display:flex;align-items:center;padding:0 8px}
  .mh-nav-row::-webkit-scrollbar{display:none}
  .mh-nav-row a{display:block;padding:10px 12px;white-space:nowrap;font-family:var(--fh);font-size:12px;font-weight:700;color:var(--mu);border-bottom:2px solid transparent;transition:all .2s}
  .mh-nav-row a:hover{color:var(--ac);border-bottom-color:var(--ac)}
  .mh-sub{margin-left:auto;flex-shrink:0;background:var(--ac);color:#fff;border-radius:var(--rs);padding:7px 14px;font-size:12px;font-weight:700;white-space:nowrap;margin-right:8px}

  /* Content */
  .hero{padding:20px 0 28px}
  .hero-title{font-size:20px}
  .hero-body{padding:18px}
  .hero-exc{display:none}
  .hero-side{grid-template-columns:1fr !important}
  .nl-inner{flex-direction:column;text-align:center}
  .nl-form{flex-direction:column;width:100%}
  .nl-input{width:100%}
}

@media(max-width:480px){
  .cat-grid{grid-template-columns:1fr}
  .cat-exc{display:none}
}