@media (max-width:1180px){
  :root{--sidebar:200px}.subject-grid{grid-template-columns:repeat(4,1fr)}.workspace-grid{grid-template-columns:1fr}.hero-grid{grid-template-columns:1fr}.community-layout{grid-template-columns:1fr}.settings-grid{grid-template-columns:1fr}.analytics-grid{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .app-shell{display:block}.sidebar{display:none}.topbar{height:60px;padding:0 14px}.mobile-menu-btn{display:grid}.topbar-actions .ghost-btn{display:none}.content{padding:16px 12px 92px}.page-head{align-items:flex-start;flex-direction:column}.page-head h2{font-size:22px}.subject-grid{grid-template-columns:repeat(2,1fr)}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.workspace-grid,.notebook-layout,.chapter-layout,.review-layout,.split-grid{grid-template-columns:1fr}.filter-panel{display:flex;gap:6px;overflow:auto}.filter-title{display:none}.filter-btn{width:auto;white-space:nowrap}.problem-table{min-width:720px}.table-scroll{overflow:auto}.paper{margin:10px;min-height:430px}.paper-toolbar{bottom:8px}.toolset:last-child{display:none}.concept-metrics{grid-template-columns:repeat(2,1fr)}.notes-grid{grid-template-columns:1fr}.publisher-grid{grid-template-columns:1fr}.mindmap-stage{min-width:820px}.mindmap-scroll{overflow:auto}.community-layout{grid-template-columns:1fr}.mobile-nav{position:fixed;display:grid;grid-template-columns:repeat(5,1fr);left:0;right:0;bottom:0;z-index:80;background:rgba(255,255,255,.96);backdrop-filter:blur(18px);border-top:1px solid var(--line);padding:6px max(8px,env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left))}.mobile-nav button{border:0;background:transparent;display:grid;place-items:center;gap:2px;font-size:9px;color:#6e7380;min-height:52px;border-radius:12px}.mobile-nav button svg{width:19px;height:19px}.mobile-nav button.active{color:var(--accent);font-weight:800}.mobile-nav .capture-mobile{width:54px;height:54px;min-height:54px;border-radius:50%;background:var(--accent);color:#fff;margin:-20px auto 0;box-shadow:0 9px 24px rgba(109,93,252,.3)}.mobile-drawer{position:fixed;inset:0;z-index:120;background:rgba(17,20,31,.45);padding:0 25% 0 0}.mobile-drawer.open{display:block}.mobile-drawer-panel{height:100%;background:#fff;padding:18px 12px;overflow:auto}.mobile-drawer .nav-btn{width:100%}.subject-tabs{width:100%}.stat-strip{grid-template-columns:repeat(2,1fr)}.hero-grid{grid-template-columns:1fr}.composer-foot{align-items:flex-start;flex-direction:column}.heatmap{grid-template-columns:85px repeat(8,36px);overflow:auto}.topbar-left{min-width:0}.crumb{max-width:55vw}
}
@media (max-width:520px){
  .content{padding:13px 10px 90px}.page-head{margin-bottom:13px}.subject-grid{grid-template-columns:1fr 1fr;gap:8px}.subject-card{padding:11px}.subject-card strong{font-size:13px}.subject-card .subject-badge{width:30px;height:30px}.stat-strip{gap:7px;padding:10px}.stat-card{padding:10px}.stat-card strong{font-size:18px}.panel{border-radius:15px}.panel-head{padding:12px 13px}.paper{margin:7px}.paper-demo{padding:22px 18px 72px}.paper-inner{padding:22px 18px 72px}.scan-text{font-size:11px}.mapping-row{grid-template-columns:70px 1fr}.correction-list{padding-left:12px;padding-right:12px}.statement{grid-template-columns:25px 1fr}.statement-actions{grid-column:2;display:flex}.tutor-input{grid-template-columns:1fr}.tutor-input .primary-btn{width:100%}.fill-sentence{font-size:18px}.fill-input{font-size:18px;width:140px}.concept-detail{padding:15px}.modal-backdrop{padding:10px}.modal{border-radius:16px}.page-actions{width:100%}.page-actions .primary-btn,.page-actions .soft-btn{flex:1}.mobile-drawer{padding-right:16%}
}