/* Cube Student challenge + assignment mobile app experience. */
@media (max-width:900px){
  body.cube-challenges-app{background:#f6f7ff;color:#20233b}
  .cm-ch-topbar{position:sticky;top:0;z-index:70;padding:calc(10px + env(safe-area-inset-top,0px)) 16px 10px;background:rgba(246,247,255,.94);border-bottom:1px solid #e5e7f3;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}
  .cm-ch-brand b{font-size:18px;color:#20233b}.cm-ch-brand img{width:38px;height:38px;border-radius:13px}.cm-ch-back{display:none}
  .cm-ch-page{max-width:520px;padding:16px 16px calc(92px + env(safe-area-inset-bottom,0px));gap:22px}
  .cm-ch-streak{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:13px 15px;border:2px solid #ebe5ff;border-bottom-width:5px;border-radius:18px;background:#fff;color:#20233b}
  .cm-ch-streak-fire{width:46px;height:46px;display:grid;place-items:center;border-radius:15px;background:#fff3df;font-size:25px}
  .cm-ch-streak-copy strong{display:block;font-size:15px}.cm-ch-streak-copy span{display:block;margin-top:2px;color:#70758f;font-size:12px;line-height:1.35}
  .cm-ch-streak-count{color:#ff8a3d;font-size:21px;font-weight:900}.cm-ch-streak-count small{display:block;color:#8b90a8;font-size:9px;text-align:center;text-transform:uppercase;letter-spacing:.06em}
  .cm-ch-hero{position:relative;overflow:hidden;padding:22px;border-radius:24px;background:linear-gradient(145deg,#5b43d6,#7864ee);border-bottom:6px solid #3d2ba8;box-shadow:none}
  .cm-ch-hero::after{content:"";position:absolute;right:-32px;top:-35px;width:128px;height:128px;border:22px solid rgba(255,255,255,.08);border-radius:50%}
  .cm-ch-hero-kicker{position:relative;z-index:1;background:rgba(255,255,255,.18)}
  .cm-ch-hero-title{position:relative;z-index:1;margin-top:14px;font-size:23px}.cm-ch-hero-meta{position:relative;z-index:1;font-size:13.5px;line-height:1.4}
  .cm-ch-hero-cta{position:relative;z-index:1;width:100%;min-height:52px;border-radius:16px;background:#fff;color:#4b34c4;font-size:15px;border-bottom:4px solid #dcd5ff;transition:transform .12s,border-bottom-width .12s}
  .cm-ch-hero-cta:active{transform:translateY(3px);border-bottom-width:1px}
  .cm-ch-section{gap:12px}.cm-ch-section-label{font-size:13px;color:#525870}.cm-ch-tag{color:#6550d7;background:#ece8ff}
  .cm-ch-list{position:relative;gap:12px;padding-left:8px}
  .cm-ch-card{position:relative;min-height:78px;padding:13px 13px 13px 14px;border:2px solid #e4e6f0;border-bottom-width:5px;border-radius:19px;background:#fff;color:#20233b;box-shadow:none;transition:transform .12s,border-bottom-width .12s}
  .cm-ch-card:active{transform:translateY(3px);border-bottom-width:2px}
  .cm-ch-card+.cm-ch-card::before{content:"";position:absolute;left:31px;top:-17px;width:4px;height:15px;border-radius:3px;background:#ddd9f2}
  .cm-ch-glyph{width:46px;height:46px;border-radius:15px;background:#eeeaff;font-size:22px;border:1px solid #ded7ff}
  .cm-ch-title{font-size:15px;color:#20233b;white-space:normal}.cm-ch-meta{font-size:12px;color:#777c93;line-height:1.35}
  .cm-ch-pill{max-width:92px;overflow:hidden;text-overflow:ellipsis;font-size:9.5px;padding:5px 8px}
  .cm-ch-empty{border:2px dashed #dfe1ed;border-radius:18px;background:#fff;color:#777c93}

  body.assigned-task-foundation{--cm-bg:#f6f7ff;--cm-bg-2:#fff;--cm-bg-3:#f0f1f8;--cm-card:#fff;--cm-card-border:#e1e3ee;--cm-fg:#20233b;--cm-fg-dim:#656b83;--cm-fg-mute:#858aa0;--cm-line:#dfe2ed;--cm-accent:#6550d7;--cm-accent-2:#6550d7;--cm-accent-dim:#ece8ff;background:#f6f7ff;color:#20233b}
  body.assigned-task-foundation .topbar{position:sticky;top:0;z-index:85;min-height:58px;padding:calc(8px + env(safe-area-inset-top,0px)) 14px 8px;background:rgba(255,255,255,.96);border-bottom:1px solid #e4e6f0}
  body.assigned-task-foundation .topbar-right{display:none}
  body.assigned-task-foundation .school-logo{width:36px;height:36px}.school-name{font-size:13px}.school-sub{font-size:10px}
  body.assigned-task-foundation .page-content,body.assigned-task-foundation .runtime-body,body.assigned-task-foundation .workspace{background:#f6f7ff!important}
  body.assigned-task-foundation .task-header{position:relative;top:auto;z-index:1;padding:14px 16px 12px;background:#f6f7ff!important;border-bottom:1px solid #e4e6f0}
  body.assigned-task-foundation .task-header-row{display:grid;grid-template-columns:1fr;gap:10px}.task-title{font-size:19px!important;line-height:1.25;color:#20233b!important}.task-meta{width:100%;display:grid;grid-template-columns:auto auto 1fr;align-items:center;justify-content:start;gap:8px}
  body.assigned-task-foundation .task-due:empty{display:none}
  body.assigned-task-foundation .task-progress-wrap{order:initial;width:auto;min-width:0;display:grid;grid-template-columns:minmax(54px,1fr) auto;gap:7px}.task-progress-bar{width:100%;height:7px;background:#e4e6f0!important}.task-progress-fill{background:linear-gradient(90deg,#6550d7,#8a75f5)!important}
  body.assigned-task-foundation .workspace{padding:16px!important}
  body.assigned-task-foundation .runtime-body{display:block!important;padding-bottom:0!important;overflow:visible!important}
  body.assigned-task-foundation .ai-panel{display:none!important}
  body.assigned-task-foundation .ws-instructions,body.assigned-task-foundation .ws-panel,body.assigned-task-foundation .runtime-summary-v1{border:2px solid #e2e4ee!important;border-radius:18px!important;background:#fff!important;color:#20233b!important;box-shadow:none!important}
  body.assigned-task-foundation .ws-question{padding:18px 16px!important;border:2px solid #dedfea!important;border-bottom-width:5px!important;border-radius:22px!important;background:#fff!important;color:#20233b!important;box-shadow:none!important}
  body.assigned-task-foundation .ws-question-text,body.assigned-task-foundation #kQText{font-size:18px!important;line-height:1.45;color:#20233b!important}
  body.assigned-task-foundation .ws-q-number{padding:5px 11px!important;background:#ece8ff!important;color:#5b43d6!important}
  body.assigned-task-foundation .choice{min-height:58px!important;padding:14px!important;border:2px solid #dfe1eb!important;border-bottom-width:4px!important;border-radius:17px!important;background:#fff!important;color:#272a42!important;font-weight:700}
  body.assigned-task-foundation .choice.selected{border-color:#6c56db!important;background:#f0edff!important;color:#4b35bc!important}
  body.assigned-task-foundation .choice-letter{background:#f0f1f7!important;color:#62677e!important}
  body.assigned-task-foundation .choice.selected .choice-letter{background:#6550d7!important;color:#fff!important}
  body.assigned-task-foundation .ws-textarea{min-height:150px!important;border:2px solid #dfe1eb!important;border-radius:17px!important;background:#fff!important;color:#20233b!important}
  body.assigned-task-foundation .ws-question-controls{padding-top:10px;border-top:1px solid #eceef5}.ws-nav-btns{width:100%;display:grid!important;grid-template-columns:1fr 1fr}.ws-nav-btns .btn{justify-content:center;min-height:50px;border:2px solid #dfe1eb;border-bottom-width:4px;border-radius:15px;background:#fff}.ws-nav-btns .btn-primary{background:#6550d7!important;color:#fff;border-color:#4b35b7!important}
  body.assigned-task-foundation .task-header-actions{position:static;display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:7px;width:100%!important;margin:0;padding:0;background:transparent;border:0;box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}
  body.assigned-task-foundation .task-header-actions .btn{min-width:0;min-height:42px;padding:8px 10px;border:1px solid #dfe1eb;border-bottom-width:3px;border-radius:13px;background:#fff;color:#5b43d6;justify-content:center;font-size:12.5px;white-space:nowrap}
  body.assigned-task-foundation .task-header-actions .btn-primary{background:#6550d7;color:#fff;border-color:#4934af}
  body.assigned-task-foundation .ws-footer{display:none}
}

@media(max-width:370px){.cm-ch-streak{grid-template-columns:auto 1fr}.cm-ch-streak-count{grid-column:2}.cm-ch-pill{display:none}body.assigned-task-foundation .task-meta{grid-template-columns:auto 1fr}body.assigned-task-foundation .task-progress-wrap{grid-column:1/-1}}
@media(prefers-reduced-motion:reduce){.cm-ch-card,.cm-ch-hero-cta{transition:none}}

/* The interactive challenge owns its dark theme. The mobile rules above define
   spacing and touch geometry; these tokens restore the KX palette instead of
   forcing the optional light/classic presentation over it. */
@media (max-width:900px){
  body.assigned-task-foundation.kx-activity-v1{--cm-bg:var(--kx-bg);--cm-bg-2:var(--kx-panel);--cm-bg-3:rgba(255,255,255,.08);--cm-card:var(--kx-panel);--cm-card-border:var(--kx-line-soft);--cm-fg:var(--kx-text);--cm-fg-dim:var(--kx-muted);--cm-fg-mute:#817b9f;--cm-line:var(--kx-line-soft);--cm-accent:var(--kx-accent);--cm-accent-2:var(--kx-cube-soft);--cm-accent-dim:color-mix(in srgb,var(--kx-accent) 18%,transparent);background:var(--kx-bg);color:var(--kx-text)}
  body.assigned-task-foundation.kx-activity-v1 .topbar{background:rgba(13,10,31,.94);border-color:var(--kx-line-soft)}
  body.assigned-task-foundation.kx-activity-v1 .task-header{background:var(--kx-bg)!important;border-color:var(--kx-line-soft)}
  body.assigned-task-foundation.kx-activity-v1 .task-title{color:var(--kx-text)!important}
  body.assigned-task-foundation.kx-activity-v1 .task-due,
  body.assigned-task-foundation.kx-activity-v1 .task-progress-label{color:var(--kx-muted)}
  body.assigned-task-foundation.kx-activity-v1 .task-progress-bar{background:var(--kx-glass2)!important}
  body.assigned-task-foundation.kx-activity-v1 .task-progress-fill{background:var(--kx-good)!important}
  body.assigned-task-foundation.kx-activity-v1 .page-content,
  body.assigned-task-foundation.kx-activity-v1 .runtime-body,
  body.assigned-task-foundation.kx-activity-v1 .workspace{background:var(--kx-bg)!important}
  body.assigned-task-foundation.kx-activity-v1 .ws-instructions,
  body.assigned-task-foundation.kx-activity-v1 .ws-panel,
  body.assigned-task-foundation.kx-activity-v1 .runtime-summary-v1,
  body.assigned-task-foundation.kx-activity-v1 .ws-question{background:linear-gradient(160deg,rgba(255,255,255,.07),rgba(255,255,255,.02)),var(--kx-panel)!important;border-color:var(--kx-line-soft)!important;color:var(--kx-text)!important;box-shadow:var(--kx-inset)!important}
  body.assigned-task-foundation.kx-activity-v1 .ws-question-text,
  body.assigned-task-foundation.kx-activity-v1 #kQText{color:var(--kx-text)!important}
  body.assigned-task-foundation.kx-activity-v1 .choice{background:var(--kx-glass)!important;border-color:var(--kx-line-soft)!important;color:var(--kx-text)!important}
  body.assigned-task-foundation.kx-activity-v1 .choice.selected{background:color-mix(in srgb,var(--kx-accent) 18%,transparent)!important;border-color:var(--kx-accent)!important;color:var(--kx-text)!important}
  body.assigned-task-foundation.kx-activity-v1 .task-header-actions .btn{background:var(--kx-glass);border-color:var(--kx-line-soft);color:var(--kx-text)}
  body.assigned-task-foundation.kx-activity-v1 .task-header-actions .btn-primary{background:var(--kx-accent);border-color:color-mix(in srgb,var(--kx-accent) 72%,#000);color:#fff}
  body.assigned-task-foundation.kx-activity-v1 .runtime-body{display:grid!important;grid-template-columns:1fr;grid-template-rows:auto auto}
  body.assigned-task-foundation.kx-activity-v1 .ai-panel{display:block!important;border-left:0;border-top:1px solid var(--kx-line-soft);background:var(--kx-panel)!important;overflow:visible}
}