:root{
  --bg:#f7f8fc;
  --surface:#ffffff;
  --surface2:#f2f4fb;
  --text:#0f172a;
  --muted:#5b647a;
  --border:#e5e7ef;
  --shadow:0 12px 28px rgba(15,23,42,.08);
  --radius:16px;
  --radius2:12px;
  --container:1120px;
  --containerTight:780px;
  --gap:18px;
  --primary:#2563eb;
  --primaryHover:#1d4ed8;
  --accent:#7c3aed;
  --danger:#dc2626;
  --success:#16a34a;
  --font:ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
html[data-theme="dark"]{
  --bg:#0b1020;
  --surface:#111a33;
  --surface2:#0f1730;
  --text:#eef2ff;
  --muted:#a8b1d4;
  --border:rgba(255,255,255,.10);
  --shadow:0 18px 50px rgba(0,0,0,.35);
  --primary:#6ee7ff;
  --primaryHover:#89efff;
  --accent:#a78bfa;
  --danger:#ff6b6b;
  --success:#4ade80;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
  overflow-x:hidden;
}
a{color:inherit}
.container{max-width:var(--container); margin:0 auto; padding:0 18px}
.container-tight{max-width:var(--containerTight); margin:0 auto; padding:0 18px}

.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.70);
  border-bottom:1px solid var(--border);
  backdrop-filter: blur(10px);
}
html[data-theme="dark"] .site-header{background:rgba(11,16,32,.70)}
.nav{display:flex; align-items:center; gap:14px; padding:14px 0; position:relative}
.brand{display:flex; align-items:center; gap:10px; text-decoration:none}
.brand-logo{width:34px; height:34px}
.brand-name{font-weight:800; letter-spacing:.2px}
.nav-links{display:flex; gap:10px; align-items:center; margin-left:auto}
.nav-links a{
  text-decoration:none;
  color:var(--muted);
  padding:8px 10px;
  border-radius:10px;
}
.nav-links a.active{color:var(--text); background:rgba(37,99,235,.10)}
html[data-theme="dark"] .nav-links a.active{background:rgba(110,231,255,.10)}
.nav-actions{display:flex; gap:10px; align-items:center}
.nav-actions .btn{white-space:nowrap}
.nav-toggle{
  display:none;
  padding:10px 14px;
  border-radius:12px;
  border:1px solid var(--border);
  background:rgba(15,23,42,.03);
  color:var(--text);
  font-weight:800;
}
html[data-theme="dark"] .nav-toggle{background:rgba(255,255,255,.04)}
main.container{padding-top:24px; padding-bottom:70px}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px;
  padding:10px 14px;
  border-radius:12px;
  border:1px solid var(--border);
  background:transparent;
  color:var(--text);
  text-decoration:none;
  font-weight:700;
  cursor:pointer;
}
.btn:disabled{opacity:.55; cursor:not-allowed}
.btn-primary{
  border-color:transparent;
  background:linear-gradient(135deg, var(--primary), var(--accent));
  color:#fff;
}
html[data-theme="dark"] .btn-primary{color:#0b1020}
.btn-primary:hover{filter:saturate(1.1)}
.btn-ghost{background:rgba(15,23,42,.03)}
html[data-theme="dark"] .btn-ghost{background:rgba(255,255,255,.04)}
.btn-block{width:100%}
.inline{display:inline}
.link{color:var(--primary); text-decoration:none}
.link:hover{text-decoration:underline}
.badge,.pill{
  display:inline-flex; align-items:center;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(15,23,42,.03);
  color:var(--muted);
  font-size:13px;
}
html[data-theme="dark"] .badge,
html[data-theme="dark"] .pill{background:rgba(255,255,255,.05)}
.pill-sm{padding:4px 8px; font-size:12px}
.pill-list{display:flex; flex-wrap:wrap; gap:10px}

.lead{color:var(--muted); font-size:18px; margin:0}
.muted{color:var(--muted)}
.label{font-weight:800}
.mt{margin-top:16px}
.mt-sm{margin-top:10px}
.divider{height:1px; background:var(--border); margin:10px 0}

.section{padding:22px 0}
.section-head h1,.section-head h2{margin:0 0 6px}
.section-head{margin-bottom:14px}
.grid-2{display:grid; grid-template-columns:1fr 1fr; gap:var(--gap)}
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:var(--gap)}
.stack{display:flex; flex-direction:column; gap:12px}

.card{
  border:1px solid var(--border);
  background:var(--surface);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow);
  padding:16px;
}
html[data-theme="dark"] .card{box-shadow:0 10px 28px rgba(0,0,0,.25)}
.card-title{font-weight:900; margin:0 0 10px}
.panel{
  border:1px solid var(--border);
  background:var(--surface);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow);
}
.panel-title{font-weight:900; margin-bottom:10px}

.breadcrumbs{display:flex; gap:10px; align-items:center; color:var(--muted); font-size:13px; margin-bottom:10px}
.breadcrumbs a{color:var(--muted); text-decoration:none}
.breadcrumbs a:hover{color:var(--text)}
.code{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace; background:rgba(15,23,42,.06); border:1px solid var(--border); padding:2px 6px; border-radius:8px}
html[data-theme="dark"] .code{background:rgba(255,255,255,.06)}

.hero{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:26px;
  align-items:start;
  padding:26px 0 6px;
}
.hero-content h1{font-size:44px; line-height:1.12; margin:0 0 12px}
.hero-search{
  display:flex;
  gap:10px;
  align-items:center;
  margin-top:14px;
  max-width:640px;
}
.hero-search input{flex:1}
.hero-actions{display:flex; gap:10px; flex-wrap:wrap; margin-top:14px}
.hero-badges{display:flex; gap:10px; flex-wrap:wrap; margin-top:16px}
.hero-card .card{padding:16px}
.hero-card .card-title{margin-bottom:12px}

.page{margin:0}
.page-hero{
  padding:34px 0;
  border-bottom:1px solid var(--border);
  background:linear-gradient(135deg, rgba(37,99,235,.10), rgba(124,58,237,.08));
}
html[data-theme="dark"] .page-hero{
  background:radial-gradient(1200px 700px at 10% -10%, rgba(124,92,255,.45), transparent 60%),
             radial-gradient(1200px 700px at 80% 0%, rgba(110,231,255,.25), transparent 55%),
             var(--bg);
}
.page-hero-blog{background:linear-gradient(135deg, rgba(124,58,237,.10), rgba(37,99,235,.08))}
.page-hero-community{background:linear-gradient(135deg, rgba(37,99,235,.12), rgba(16,185,129,.10))}
.page-hero-inner h1{margin:0 0 8px; font-size:40px; line-height:1.12}
.page-body{
  display:grid;
  grid-template-columns: 360px 1fr;
  gap:var(--gap);
  padding:22px 0 8px;
}
.content-full{grid-column:1/-1}
.hero-split{display:flex; align-items:flex-start; justify-content:space-between; gap:16px}

.form-grid{display:flex; flex-direction:column; gap:12px}
.filters{
  display:grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr auto;
  gap:12px;
  align-items:end;
}
.filters-compact{grid-template-columns: 1.6fr 1fr auto}
.filters-courses{grid-template-columns: 1.8fr 1fr 1fr auto}
.field label{display:block; color:var(--muted); font-size:13px; margin-bottom:6px; font-weight:700}
input,select,textarea{
  width:100%;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:var(--surface2);
  color:var(--text);
  outline:none;
}
html[data-theme="dark"] input,
html[data-theme="dark"] select,
html[data-theme="dark"] textarea{background:rgba(255,255,255,.04)}
textarea{resize:vertical}
input:disabled{opacity:.7}
.field-actions{display:flex; gap:10px}

.grid-cards{display:grid; grid-template-columns:repeat(2,1fr); gap:var(--gap)}

.course-card{display:flex; flex-direction:column; padding:0}
.course-thumb img{width:100%; height:190px; object-fit:cover; display:block}
.course-meta{padding:14px 16px}
.course-title{font-weight:950; margin-bottom:6px}
.course-title a{text-decoration:none}
.course-row{display:flex; justify-content:space-between; align-items:center; gap:10px}
.course-actions{display:flex; gap:10px; margin-top:12px; align-items:center}
.price{font-weight:950}
.price-lg{font-size:22px}
.course-hero-img{width:100%; height:170px; object-fit:cover; border-radius:12px; border:1px solid var(--border); margin-bottom:10px}

.course-page{padding-bottom:40px}
.course-hero{
  padding:34px 0;
  border-bottom:1px solid var(--border);
  background:linear-gradient(135deg, rgba(37,99,235,.10), rgba(124,58,237,.08));
}
html[data-theme="dark"] .course-hero{
  background:radial-gradient(1200px 700px at 10% -10%, rgba(124,92,255,.45), transparent 60%),
             radial-gradient(1200px 700px at 80% 0%, rgba(110,231,255,.25), transparent 55%),
             var(--bg);
}
.course-hero-inner{display:flex}
.course-hero-main{max-width:820px}
.course-hero-main h1{margin:0 0 10px; font-size:40px; line-height:1.12}
.course-hero-meta{display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin-top:12px}
.course-layout{
  display:grid;
  grid-template-columns: 1fr 360px;
  gap:var(--gap);
  padding-top:22px;
}
.purchase-card{position:sticky; top:92px}
.preview-card{position:relative}
.preview-img{width:100%; height:200px; object-fit:cover; border-radius:14px; border:1px solid var(--border)}
.preview-btn{
  position:absolute;
  inset:auto 14px 14px 14px;
  width:calc(100% - 28px);
}

.course-player{padding:22px 0 50px}
.player-layout{
  display:grid;
  grid-template-columns: 1fr 360px;
  gap:var(--gap);
}
.player-side{position:sticky; top:92px; align-self:start}

.tabs{
  display:flex;
  gap:8px;
  padding:10px;
  border:1px solid var(--border);
  border-radius:14px;
  background:var(--surface);
  box-shadow:var(--shadow);
}
.tab{
  border:1px solid transparent;
  background:transparent;
  color:var(--muted);
  padding:10px 12px;
  border-radius:12px;
  font-weight:900;
  cursor:pointer;
}
.tab.is-active{color:var(--text); background:rgba(37,99,235,.10); border-color:rgba(37,99,235,.18)}
html[data-theme="dark"] .tab.is-active{background:rgba(110,231,255,.10); border-color:rgba(110,231,255,.18)}
.tab-panels{margin-top:14px}
.tab-panel{display:none}
.tab-panel.is-active{display:block}

.checklist{margin:0; padding-left:18px}
.checklist li{margin:8px 0; color:var(--muted)}

.accordion{display:flex; flex-direction:column; gap:10px}
.acc{border:1px solid var(--border); border-radius:14px; overflow:hidden; background:var(--surface2)}
html[data-theme="dark"] .acc{background:rgba(255,255,255,.04)}
.acc-sum{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:12px 14px;
  cursor:pointer;
  list-style:none;
  font-weight:950;
}
.acc-sum::-webkit-details-marker{display:none}
.acc-title{min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.acc-body{padding:10px 12px; border-top:1px solid var(--border)}
.lesson{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:10px 10px;
  border-radius:12px;
}
.lesson + .lesson{border-top:1px solid var(--border)}
.lesson-left{display:flex; gap:10px; align-items:center; min-width:0}
.lesson-left span{white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.lesson-play{width:26px; height:26px; border-radius:999px; display:flex; align-items:center; justify-content:center; border:1px solid var(--border); color:var(--muted); flex:0 0 auto}

.modal::backdrop{background:rgba(0,0,0,.45)}
.modal{border:none; padding:0; background:transparent}
.modal-inner{width:min(760px, calc(100vw - 24px)); margin:0; border-radius:16px; overflow:hidden; border:1px solid var(--border); background:var(--surface); box-shadow:var(--shadow)}
.modal-head{display:flex; justify-content:space-between; align-items:center; gap:12px; padding:12px 14px; border-bottom:1px solid var(--border); background:var(--surface2)}
html[data-theme="dark"] .modal-head{background:rgba(255,255,255,.04)}
.modal-body{padding:14px}

.course-mini-list{display:flex; flex-direction:column; gap:10px}
.course-mini{
  display:flex; gap:12px; align-items:center;
  text-decoration:none;
  padding:10px;
  border-radius:14px;
  border:1px solid var(--border);
  background:var(--surface2);
}
html[data-theme="dark"] .course-mini{background:rgba(255,255,255,.04)}
.course-mini:hover{filter:brightness(0.99)}
html[data-theme="dark"] .course-mini:hover{filter:brightness(1.05)}
.course-mini img{border-radius:12px; object-fit:cover}
.course-mini-title{font-weight:950}
.course-mini-price{margin-left:auto; font-weight:950}

.video{position:relative; padding-top:56.25%; border-radius:14px; overflow:hidden; border:1px solid var(--border); background:rgba(15,23,42,.04)}
html[data-theme="dark"] .video{background:rgba(0,0,0,.25)}
.video iframe{position:absolute; inset:0; width:100%; height:100%; border:0}

.flash{
  padding:12px 14px;
  border-radius:14px;
  border:1px solid var(--border);
  margin-bottom:12px;
}
.flash-success{border-color:rgba(22,163,74,.25); background:rgba(22,163,74,.08)}
.flash-error{border-color:rgba(220,38,38,.25); background:rgba(220,38,38,.08)}
html[data-theme="dark"] .flash-success{border-color:rgba(74,222,128,.35); background:rgba(74,222,128,.10)}
html[data-theme="dark"] .flash-error{border-color:rgba(255,107,107,.35); background:rgba(255,107,107,.10)}

.quote{font-size:16px; margin:0 0 10px}
.rating-line{display:flex; gap:10px; align-items:center; margin:10px 0}
.stars{letter-spacing:1px}

.cart-item{display:flex; justify-content:space-between; align-items:center; gap:14px}
.cart-left{display:flex; gap:12px; align-items:center}
.cart-thumb{width:74px; height:52px; border-radius:12px; border:1px solid var(--border); object-fit:cover}
.cart-right{display:flex; gap:12px; align-items:center}

.order-line{display:flex; justify-content:space-between; align-items:center; gap:12px; padding:12px; border-radius:14px; border:1px solid var(--border); background:var(--surface2)}
html[data-theme="dark"] .order-line{background:rgba(255,255,255,.04)}

.pagination{display:flex; gap:10px; justify-content:center; margin-top:18px}
.page{
  padding:8px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  text-decoration:none;
  color:var(--muted);
  background:var(--surface);
}
.page.active{color:var(--text); border-color:rgba(37,99,235,.35); background:rgba(37,99,235,.08)}
html[data-theme="dark"] .page.active{border-color:rgba(110,231,255,.35); background:rgba(110,231,255,.10)}

.post-card{display:flex; flex-direction:column; padding:0}
.post-media img{width:100%; height:200px; object-fit:cover; display:block}
.post-body{padding:14px 16px}
.post-meta{display:flex; justify-content:space-between; align-items:center; gap:12px; margin-bottom:8px}
.post-tags{display:flex; gap:8px; flex-wrap:wrap; justify-content:flex-end}
.post-title{font-weight:950; margin-bottom:8px}
.post-title a{text-decoration:none}

.page-blog-post{padding:22px 18px 60px; max-width:var(--containerTight); margin:0 auto}
.post-hero{display:grid; grid-template-columns: 1fr; gap:14px}
.post-hero-media img{width:100%; height:280px; object-fit:cover; border-radius:18px; border:1px solid var(--border); box-shadow:var(--shadow)}
.post-hero-body h1{margin:0 0 8px; font-size:38px; line-height:1.14}
.post-hero-meta{display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin-bottom:10px}
.post-content{margin-top:8px}
.prose h1,.prose h2{margin:0 0 10px}
.prose p,.prose ul{color:var(--muted)}
.prose a{color:var(--primary)}
.prose ul{padding-left:18px}

.forum{padding:0}
.forum-head{
  display:grid;
  grid-template-columns: 1fr 90px 170px 120px;
  gap:12px;
  padding:12px 16px;
  border-bottom:1px solid var(--border);
  background:var(--surface2);
  border-top-left-radius:var(--radius);
  border-top-right-radius:var(--radius);
}
html[data-theme="dark"] .forum-head{background:rgba(255,255,255,.04)}
.forum-list{display:flex; flex-direction:column}
.forum-row{
  display:grid;
  grid-template-columns: 1fr 90px 170px 120px;
  gap:12px;
  padding:14px 16px;
  text-decoration:none;
  color:inherit;
  border-bottom:1px solid var(--border);
}
.forum-row:hover{background:rgba(37,99,235,.05)}
html[data-theme="dark"] .forum-row:hover{background:rgba(110,231,255,.06)}
.forum-main{display:flex; gap:12px; align-items:center; min-width:0}
.forum-text{min-width:0}
.forum-title{font-weight:950; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.forum-sub{margin-top:4px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.forum-replies{color:var(--muted); font-weight:800}
.forum-stats{display:flex; gap:10px; align-items:center; justify-content:flex-start; color:var(--muted)}
.forum-date{color:var(--muted)}

.cat-list{display:flex; flex-direction:column; gap:8px}
.cat{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid transparent;
  text-decoration:none;
  color:var(--text);
  background:transparent;
}
.cat:hover{background:rgba(37,99,235,.06)}
html[data-theme="dark"] .cat:hover{background:rgba(110,231,255,.06)}
.cat.is-active{background:rgba(37,99,235,.10); border-color:rgba(37,99,235,.18)}
html[data-theme="dark"] .cat.is-active{background:rgba(110,231,255,.10); border-color:rgba(110,231,255,.18)}

.forum2{padding:0}
.forum2-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:14px 16px;
  border-bottom:1px solid var(--border);
  background:var(--surface2);
  border-top-left-radius:var(--radius);
  border-top-right-radius:var(--radius);
}
html[data-theme="dark"] .forum2-head{background:rgba(255,255,255,.04)}
.forum2-title{font-weight:950}
.tabs2{display:flex; gap:8px; flex-wrap:wrap}
.tab2{
  padding:8px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  text-decoration:none;
  color:var(--muted);
  background:var(--surface);
  font-weight:800;
  font-size:13px;
}
.tab2.is-active{color:var(--text); background:rgba(37,99,235,.10); border-color:rgba(37,99,235,.18)}
html[data-theme="dark"] .tab2.is-active{background:rgba(110,231,255,.10); border-color:rgba(110,231,255,.18)}
.forum2-list{display:flex; flex-direction:column}
.topic{
  display:flex;
  justify-content:space-between;
  gap:14px;
  padding:14px 16px;
  border-bottom:1px solid var(--border);
  color:inherit;
}
.topic:hover{background:rgba(37,99,235,.05)}
html[data-theme="dark"] .topic:hover{background:rgba(110,231,255,.06)}
.topic-link{flex:1; text-decoration:none; color:inherit}
.topic-meta{display:flex; gap:10px; align-items:center; flex-wrap:wrap}
.topic-title{font-weight:950; margin-top:6px}
.topic-title{overflow-wrap:anywhere}
.topic-stats{display:flex; gap:14px; align-items:center; color:var(--muted); font-weight:800}
.stat.ok{color:var(--success)}
.stat.open{color:var(--muted)}
.btn-xs{padding:7px 10px; border-radius:10px; font-size:13px}

.thread-hero{display:grid; grid-template-columns: 1fr; gap:16px}
.thread-actions{display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin-top:12px}
.thread-stats{display:flex; gap:12px; align-items:center; margin-top:10px}

.thread-card{display:grid; grid-template-columns: 1fr; gap:0; padding:16px}
.thread-body{padding:14px 16px}
.thread-title{font-weight:950; margin-bottom:6px}
.thread-title a{text-decoration:none}

.site-footer{
  border-top:1px solid var(--border);
  background:var(--surface);
  padding:34px 0 0;
}
.footer-grid{display:grid; grid-template-columns: 1.3fr 1fr 1fr; gap:44px; padding-bottom:22px}
.footer-brand{font-weight:950; margin-bottom:6px}
.footer-title{font-weight:950; margin-bottom:10px}
.footer-links{display:flex; flex-direction:column; gap:8px; margin-top:12px}
.footer-links a{text-decoration:none; color:var(--muted)}
.footer-links a:hover{color:var(--text)}
.footer-bottom{
  border-top:1px solid var(--border);
  background:var(--surface2);
  padding:14px 0;
  text-align:center;
}
html[data-theme="dark"] .footer-bottom{background:rgba(255,255,255,.04)}

.auth{display:flex; justify-content:center}
.auth .card{max-width:520px; width:100%; padding:16px}

.avatar{
  width:44px; height:44px;
  border-radius:999px;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg, rgba(37,99,235,.12), rgba(124,58,237,.10));
  border:1px solid var(--border);
  font-weight:950;
}
html[data-theme="dark"] .avatar{background:linear-gradient(135deg, rgba(110,231,255,.20), rgba(124,92,255,.20))}
.avatar-lg{width:64px; height:64px; font-size:22px}

.sr-only{
  position:absolute;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  border:0;
}

@media (max-width: 1100px){
  .page-body{grid-template-columns: 1fr; }
  .side{order:2}
  .content{order:1}
  .grid-cards{grid-template-columns:1fr 1fr}
  .course-layout{grid-template-columns:1fr}
  .purchase-card{position:static}
  .player-layout{grid-template-columns:1fr}
  .player-side{position:static}
}
@media (max-width: 980px){
  .hero{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr; gap:18px}
  .thread-hero{grid-template-columns:1fr}
  .filters{grid-template-columns:1fr 1fr}
  .filters .field-actions{grid-column:1/-1; justify-content:flex-end}
}
@media (max-width: 720px){
  .grid-2,.grid-3,.grid-cards{grid-template-columns:1fr}
  .nav{flex-wrap:wrap}
  .brand{order:1}
  .nav-toggle{order:2}
  .nav-links{order:3; margin-left:0}
  .nav-actions{order:4}
  .nav-links{display:none}
  .nav-toggle{display:inline-flex; margin-left:auto}
  .nav.is-open .nav-links{
    display:flex;
    position:static;
    width:100%;
    margin-left:0;
    padding:12px 0 0;
    background:transparent;
    border-bottom:0;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
  }
  .nav.is-open .nav-links a{width:100%}
  .nav-actions{display:none}
  .nav.is-open .nav-actions{
    display:flex;
    width:100%;
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    padding:12px 0 10px;
    border-bottom:0;
    background:transparent;
    margin-left:0;
  }
  .nav.is-open .nav-actions .btn,
  .nav.is-open .nav-actions a.btn,
  .nav.is-open .nav-actions button.btn{width:100%}
  .nav.is-open .nav-actions form.inline{display:block}
  .nav.is-open .nav-actions form.inline .btn{width:100%}
  .hero-content h1{font-size:34px}
  .hero-search{flex-direction:column; align-items:stretch}
  .hero-search .btn{width:100%}
  .hero-actions{flex-direction:column; align-items:stretch}
  .hero-actions .btn{width:100%}
  .page-hero-inner h1{font-size:32px}
  .forum-head{display:none}
  .forum-row{grid-template-columns:1fr}
  .forum-replies,.forum-stats,.forum-date{margin-left:0}
  .forum2-head{flex-direction:column; align-items:flex-start}
  .tabs2{flex-wrap:wrap; width:100%}
  .topic{flex-direction:column; align-items:stretch}
  .topic-stats{justify-content:flex-start; flex-wrap:wrap}
  .topic-meta{gap:8px}
  .course-hero-main h1{font-size:32px}
  .tabs{flex-wrap:wrap}
  .footer-bottom{flex-direction:column; align-items:flex-start}
}

@media (max-width: 420px){
  main.container{padding-top:18px}
  .hero-content h1{font-size:30px}
  .page-hero{padding:26px 0}
  .post-hero-media img{height:220px}
  .preview-img{height:180px}
}