:root{--ink:#172033;--muted:#667085;--line:#dfe4ea;--accent:#2563eb;--soft:#eff6ff;--bg:#f7f9fc;--dark:#09111f}
*,*::before,*::after{box-sizing:border-box}html,body{margin:0;width:100%;max-width:100%;overflow-x:hidden;overflow-x:clip}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink);line-height:1.68}
main,section,article,aside,nav,header,footer,div,ul,ol,li{min-width:0;max-width:100%}img,svg,video,iframe{max-width:100%;height:auto}h1,h2,h3,p,a,li,span,strong{overflow-wrap:anywhere}
.wrap{width:min(calc(100% - 16px),1500px);margin:auto;padding:8px 0 36px}.top{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 14px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.hero{background:linear-gradient(135deg,#eef5ff,#ecfdf5);border:1px solid #d9e4ef;border-radius:16px;padding:22px;margin:12px 0}.hero h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.05;margin:.15em 0}.pill{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 9px;margin:3px;font-weight:700}
.menu-btn{display:none;width:100%;padding:10px;border:1px solid #bfdbfe;border-radius:10px;background:#eff6ff;font-weight:800}.layout{display:grid;grid-template-columns:minmax(260px,330px) minmax(0,1fr);gap:14px;align-items:start}
.side{position:sticky;top:6px;background:#fff;border:1px solid var(--line);border-radius:14px;max-height:calc(100vh - 12px);overflow:auto;padding:12px}.side input{width:100%;min-width:0;padding:8px;border:1px solid var(--line);border-radius:8px}
.chapters{list-style:none;padding:0}.chapters>li>a{display:block;padding:7px;border-radius:8px;font-weight:800;text-decoration:none;color:#1d4ed8}.chapters>li>a:hover,.chapters>li>a.active{background:var(--soft)}.subs{list-style:none;padding:0 0 0 12px}.subs a{display:block;padding:4px 6px;text-decoration:none;font-size:.88rem;color:#475467}
.content{background:#fff;border:1px solid var(--line);border-radius:14px;padding:clamp(14px,3vw,28px)}.jump{display:flex;flex-wrap:wrap;gap:6px}.jump a{background:var(--soft);border-radius:999px;padding:6px 9px;text-decoration:none;font-weight:700}
.topic{border-top:1px solid var(--line);padding:20px 0}.topic:first-of-type{border-top:0}.topic h2{scroll-margin-top:12px}.box{border:1px solid var(--line);border-radius:10px;padding:12px;margin:10px 0;background:#fbfdff}.code{background:var(--dark);color:#e5edf7}.code h3{color:#fff}
pre,code{direction:ltr!important;text-align:left!important;unicode-bidi:isolate}pre{max-width:100%;overflow-x:auto;white-space:pre;background:#050b15;border-radius:8px;padding:12px;color:#dbeafe}
.practice{border-left:5px solid #d97706;background:#fff8ed}.mistake{border-left:5px solid #dc2626;background:#fff7f7}.expected{border-left:5px solid #059669;background:#f0fdf4}.qa details{border-top:1px solid var(--line);padding:7px 0}.qa summary{font-weight:800;cursor:pointer}
.nav{display:flex;gap:8px;flex-wrap:wrap;justify-content:space-between;margin-top:18px}.nav a{border:1px solid var(--line);padding:7px 10px;border-radius:8px;text-decoration:none}.footer{background:#111827;color:#e5e7eb;border-radius:14px;padding:18px;margin-top:16px}
[dir=rtl] body,.rtl{direction:rtl;text-align:right}[dir=rtl] pre,[dir=rtl] code,.rtl pre,.rtl code{direction:ltr!important;text-align:left!important;unicode-bidi:isolate}
@media(max-width:1000px){.layout{grid-template-columns:1fr}.menu-btn{display:block;position:sticky;top:4px;z-index:12}.side{position:fixed;z-index:20;inset:0 auto 0 0;width:min(90vw,390px);max-height:100vh;border-radius:0;transform:translateX(-105%);transition:.2s}.side.open{transform:none}[dir=rtl] .side,.rtl .side{left:auto;right:0;transform:translateX(105%)}[dir=rtl] .side.open,.rtl .side.open{transform:none}}
@media(max-width:500px){.wrap{width:calc(100% - 6px)}.content{padding:12px}.hero{padding:15px}}

/* ===== EasyTutorGuide React-style site header/footer additions ===== */
.etg-site-header{position:relative;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:10px 14px;margin:10px 0 13px;background:#fff;border:1px solid #d8e2ec;border-radius:16px;box-shadow:0 12px 34px rgba(56,78,112,.08);min-width:0;max-width:100%}
.etg-header-logo-row{flex:0 0 auto;min-width:0}.etg-site-logo-link{display:flex;align-items:center;gap:8px;text-decoration:none;color:inherit;min-width:0}.etg-site-logo-image img{display:block;width:150px;height:75px;object-fit:contain;max-width:100%}.etg-site-logo-text{min-width:0}.etg-logo-tagline{font-size:.86rem;font-weight:800;color:#53657a;white-space:nowrap}
.etg-main-nav{min-width:0}.etg-nav-links{display:flex;flex-wrap:wrap;gap:3px 8px;list-style:none;margin:0;padding:0;justify-content:flex-end}.etg-nav-links a{display:block;padding:7px;text-decoration:none;border-radius:9px;font-size:.9rem;font-weight:700;color:#25324a}.etg-nav-links a:hover,.etg-nav-links a.active{background:linear-gradient(100deg,#edf6ff,#f4efff);color:#153e75}
.etg-menu-toggle{display:none;border:1px solid #cbd5e1;background:linear-gradient(135deg,#fff,#eef7ff);border-radius:10px;padding:8px 11px;font-size:1.25rem;cursor:pointer}.etg-mobile-nav{display:none;margin:-5px 0 12px;padding:8px;background:#fff;border:1px solid #d8e2ec;border-radius:12px}.etg-mobile-nav.open{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.etg-mobile-nav a{display:block;padding:9px 10px;border-radius:8px;text-decoration:none;font-weight:700;color:#25324a;background:#f8fbff}
.etg-site-footer{margin-top:18px;padding:22px 18px;background:linear-gradient(150deg,#101827,#172033);color:#fff;border-radius:16px;max-width:100%}.etg-footer-menu{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin-bottom:16px}.etg-footer-col{display:flex;flex-direction:column;gap:7px;min-width:0}.etg-footer-col strong{color:#fff}.etg-footer-col a{color:#e7eef8;text-decoration:none;font-weight:700}.etg-footer-col a:hover{text-decoration:underline}
.etg-footer-social{display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;margin:17px 0}.etg-footer-social a{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:#fff;border:1px solid rgba(255,255,255,.16);box-shadow:0 6px 16px rgba(0,0,0,.15);text-decoration:none;transition:transform .2s ease}.etg-footer-social a:hover{transform:translateY(-2px)}.etg-footer-social svg{width:21px;height:21px;display:block;fill:currentColor}.etg-footer-social a:nth-child(1){color:#1877f2}.etg-footer-social a:nth-child(2){color:#e4405f}.etg-footer-social a:nth-child(3){color:#111}.etg-footer-social a:nth-child(4){color:#ff0000}.etg-footer-social a:nth-child(5){color:#111}.etg-footer-social a:nth-child(6){color:#0088cc}
.etg-footer-copy,.etg-footer-note{text-align:center;margin:7px 0;color:#e7eef8;font-weight:700}.etg-footer-note{font-size:.9rem;font-weight:500;color:#cdd8e6}
@media(max-width:1000px){.etg-main-nav{display:none}.etg-menu-toggle{display:block}.etg-site-header{gap:10px}.etg-footer-menu{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.etg-site-header{padding:8px 10px}.etg-site-logo-image img{width:130px;height:65px}.etg-logo-tagline{display:none}.etg-footer-menu{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.etg-site-footer{padding:18px 12px}}
@media(max-width:390px){.etg-site-logo-image img{width:112px;height:auto}.etg-mobile-nav.open{grid-template-columns:1fr}}
[dir="rtl"] .etg-site-header,[dir="rtl"] .etg-site-footer{text-align:right}