:root{--umc-bg:#041020;--umc-panel:rgba(7,22,42,.82);--umc-panel2:rgba(7,18,35,.70);--umc-border:rgba(110,220,255,.18);--umc-text:#edf8ff;--umc-muted:#a7bad0;--umc-cyan:#37d9ff;--umc-blue:#2197ff;--accent:#37d9ff}
.umc-platform-hub,.umc-chem-hub,.umc-unit-dashboard-v2,.umc-lesson-shell-v2,.umc-about-page{color:var(--umc-text)}
.umc-kicker{margin:0 0 .55rem;color:var(--accent,#37d9ff);font-size:.76rem;font-weight:900;text-transform:uppercase;letter-spacing:.16em}.umc-muted-note{color:var(--umc-muted);font-size:.88rem;line-height:1.55}.umc-button{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:44px;padding:.78rem 1.08rem;border:1px solid rgba(110,220,255,.22);border-radius:14px;background:rgba(110,220,255,.06);color:var(--umc-text);text-decoration:none;font-weight:850;transition:.2s ease}.umc-button:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--accent) 65%,transparent);box-shadow:0 0 28px color-mix(in srgb,var(--accent) 20%,transparent)}.umc-button-primary{border-color:transparent;background:linear-gradient(135deg,var(--accent),#216dff);color:#041020}.umc-button-disabled{opacity:.6;pointer-events:none;filter:saturate(.5)}
.umc-hex-emblem{width:94px;aspect-ratio:1;display:grid;place-items:center;border-radius:28px;color:var(--accent);background:radial-gradient(circle at 50% 42%,color-mix(in srgb,var(--accent) 24%,transparent),transparent 60%);filter:drop-shadow(0 0 20px color-mix(in srgb,var(--accent) 36%,transparent))}.umc-hex-emblem svg{width:86%;height:86%;stroke:currentColor;fill:none;stroke-width:3.2;stroke-linecap:round;stroke-linejoin:round}.umc-hex-emblem.small{width:72px;border-radius:22px}.umc-chip-row{display:flex;gap:.48rem;flex-wrap:wrap;margin-top:.8rem}.umc-chip{display:inline-flex;align-items:center;min-height:32px;padding:.42rem .66rem;border:1px solid rgba(110,220,255,.18);border-radius:999px;background:rgba(110,220,255,.055);color:#d9f3ff;font-size:.82rem;font-weight:750}.umc-standard-chips .umc-chip{border-color:rgba(55,151,255,.42);background:rgba(33,151,255,.10)}.umc-sep-chips .umc-chip{border-color:color-mix(in srgb,var(--accent) 38%,transparent);background:color-mix(in srgb,var(--accent) 10%,transparent)}.umc-ccc-chips .umc-chip{border-color:rgba(255,200,87,.38);background:rgba(255,200,87,.085);color:#fff0bf}
/* Home / courses */
.umc-platform-hero{position:relative;overflow:hidden;display:grid;grid-template-columns:auto minmax(0,1fr);gap:1.4rem;align-items:center;margin-bottom:1.3rem;padding:clamp(1.2rem,3vw,2rem);border:1px solid rgba(110,220,255,.18);border-radius:28px;background:linear-gradient(135deg,rgba(7,22,42,.86),rgba(4,12,24,.68));box-shadow:0 24px 80px rgba(0,0,0,.34)}.umc-platform-hero::after{content:"";position:absolute;right:-10rem;top:-12rem;width:34rem;height:34rem;background:radial-gradient(circle,rgba(55,217,255,.15),transparent 68%);pointer-events:none}.umc-platform-hero>*{position:relative;z-index:1}.umc-platform-hero h1{margin:0;max-width:14ch;font-size:clamp(2.4rem,5.5vw,5.2rem);line-height:.95;letter-spacing:-.055em}.umc-platform-hero p{max-width:68ch;color:var(--umc-muted);line-height:1.65}.umc-hero-links{display:flex;gap:.7rem;flex-wrap:wrap;margin-top:1rem}.umc-subject-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:1rem}.umc-subject-card{position:relative;overflow:hidden;min-height:255px;padding:1.1rem;border:1px solid color-mix(in srgb,var(--accent) 26%,transparent);border-radius:24px;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 13%,rgba(7,22,42,.9)),rgba(4,12,24,.72));box-shadow:0 20px 60px rgba(0,0,0,.28);text-decoration:none;display:flex;flex-direction:column;transition:.2s ease}.umc-subject-card:hover{transform:translateY(-4px);box-shadow:0 24px 76px rgba(0,0,0,.42),0 0 30px color-mix(in srgb,var(--accent) 20%,transparent)}.umc-subject-card.is-preview{opacity:.76;filter:saturate(.72)}.umc-card-sheen{position:absolute;inset:0;background:radial-gradient(circle at 78% 22%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 48%),linear-gradient(120deg,transparent 0%,rgba(255,255,255,.04) 40%,transparent 65%);pointer-events:none}.umc-card-top{display:flex;justify-content:space-between;align-items:center;position:relative}.umc-subject-icon{width:54px;height:54px;color:var(--accent)}.umc-subject-icon svg{width:100%;height:100%;stroke:currentColor;fill:none;stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round}.umc-status{display:inline-flex;align-items:center;width:max-content;min-height:28px;padding:.32rem .6rem;border:1px solid color-mix(in srgb,var(--accent) 42%,transparent);border-radius:999px;background:color-mix(in srgb,var(--accent) 8%,transparent);color:var(--accent);font-size:.7rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.umc-subject-card h2{position:relative;margin:.8rem 0 .25rem;font-size:1.35rem;letter-spacing:-.035em}.umc-subtitle{color:var(--accent)!important;font-weight:800}.umc-subject-card p{position:relative;color:var(--umc-muted);line-height:1.55}.umc-card-action{position:relative;margin-top:auto;color:var(--accent);font-weight:900}
/* Chemistry hub */
.umc-chem-hub{max-width:1460px;margin:0 auto}.umc-chem-hero{display:grid;grid-template-columns:140px minmax(0,1fr) minmax(320px,.75fr);gap:1.6rem;align-items:center;margin-bottom:1.4rem}.umc-hero-icon{width:128px;aspect-ratio:1;display:grid;place-items:center;color:var(--accent);border:1px solid rgba(55,217,255,.24);border-radius:32px;background:radial-gradient(circle at 50% 45%,rgba(55,217,255,.22),transparent 60%);filter:drop-shadow(0 0 24px rgba(55,217,255,.25))}.umc-hero-icon svg{width:82%;height:82%;stroke:currentColor;fill:none;stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round}.umc-chem-copy h1{margin:0;font-size:clamp(2.8rem,5vw,5rem);line-height:.96;letter-spacing:-.055em}.umc-chem-copy p{font-size:1.25rem;color:var(--umc-muted);line-height:1.55;max-width:58ch}.umc-feature-strip{display:flex;gap:1.2rem;flex-wrap:wrap;margin-top:1.4rem;color:#d7eafb}.umc-feature-strip span{display:inline-flex;gap:.55rem;align-items:center;color:#cce2f4}.umc-feature-strip svg{width:22px;height:22px;stroke:var(--accent);fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.umc-difference-card{padding:1.2rem;border:1px solid rgba(55,217,255,.20);border-radius:24px;background:linear-gradient(135deg,rgba(8,27,50,.86),rgba(5,15,31,.72));box-shadow:0 20px 70px rgba(0,0,0,.28)}.umc-difference-card h2{margin:.2rem 0 1rem}.umc-difference-row{display:grid;grid-template-columns:42px minmax(0,1fr);gap:.8rem;align-items:start;margin:.8rem 0}.umc-difference-row span{width:42px;height:42px;display:grid;place-items:center;border:1px solid rgba(55,217,255,.22);border-radius:50%;color:var(--accent);background:rgba(55,217,255,.06)}.umc-difference-row svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:3}.umc-difference-row strong{display:block}.umc-difference-row p{margin:.15rem 0 0;color:var(--umc-muted);font-size:.92rem}.umc-unit-card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem}.umc-course-unit-card{position:relative;overflow:hidden;min-height:292px;padding:1rem;border:1px solid color-mix(in srgb,var(--accent) 32%,transparent);border-radius:18px;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 12%,rgba(6,17,31,.92)),rgba(4,12,24,.70));text-decoration:none;display:flex;flex-direction:column;box-shadow:0 18px 55px rgba(0,0,0,.26);transition:.2s ease}.umc-course-unit-card:nth-child(5),.umc-course-unit-card:nth-child(6),.umc-course-unit-card:nth-child(7){grid-column:span 1}.umc-course-unit-card:hover{transform:translateY(-4px);box-shadow:0 25px 76px rgba(0,0,0,.42),0 0 34px color-mix(in srgb,var(--accent) 18%,transparent)}.umc-course-unit-card.is-locked{cursor:not-allowed}.umc-course-unit-card.is-locked .umc-card-sheen{opacity:.65}.umc-unit-num{width:58px;height:46px;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--accent) 52%,transparent);border-radius:12px;color:var(--accent);font-size:1.45rem;font-weight:900;background:color-mix(in srgb,var(--accent) 10%,transparent)}.umc-unit-art{position:absolute;right:1rem;top:1.4rem;width:42%;height:42%;color:var(--accent);opacity:.72;filter:drop-shadow(0 0 24px color-mix(in srgb,var(--accent) 38%,transparent))}.umc-unit-art svg{width:100%;height:100%;stroke:currentColor;fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}.umc-course-unit-card>p,.umc-course-unit-card h2,.umc-card-desc,.umc-unit-feature-row,.umc-arrow{position:relative;z-index:1}.umc-course-unit-card>p{margin:1rem 0 .25rem;color:#d5e8f6}.umc-course-unit-card h2{margin:.1rem 0 .6rem;font-size:1.35rem;line-height:1.15}.umc-card-desc{color:var(--umc-muted);line-height:1.45;font-size:.92rem}.umc-unit-feature-row{display:grid;grid-template-columns:repeat(4,1fr);gap:.4rem;margin-top:auto;padding-top:.85rem;border-top:1px solid rgba(110,220,255,.14)}.umc-unit-feature-row span{display:grid;place-items:center;gap:.25rem;color:var(--accent);font-size:.7rem}.umc-unit-feature-row svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:3}.umc-unit-feature-row b{color:#cfe6f6;font-weight:700}.umc-arrow{position:absolute;right:1rem;bottom:1rem;width:48px;height:48px;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--accent) 55%,transparent);border-radius:50%;color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,transparent);font-weight:900}.umc-bottom-banner{display:flex;align-items:center;gap:1rem;justify-content:space-between;margin-top:1.2rem;padding:1rem 1.25rem;border:1px solid rgba(110,220,255,.14);border-radius:18px;background:rgba(8,24,43,.68);color:#dceffd}.umc-bottom-banner span{color:var(--umc-muted)}
/* Unit dashboard */
.umc-unit-dashboard-v2{display:grid;grid-template-columns:220px minmax(0,1fr);gap:1.2rem;max-width:1460px;margin:0 auto}.umc-unit-sidebar{display:flex;flex-direction:column;gap:.6rem}.umc-side-unit-card{padding:1rem;border:1px solid rgba(55,217,255,.22);border-radius:18px;background:linear-gradient(135deg,rgba(8,27,50,.86),rgba(4,12,24,.76));box-shadow:0 20px 60px rgba(0,0,0,.25)}.umc-unit-num-big{display:block;color:var(--accent);font-size:2.2rem;font-weight:950;letter-spacing:.02em}.umc-side-unit-card p{margin:.25rem 0;color:#cfe6f6}.umc-side-unit-card h2{margin:.25rem 0 0;font-size:1.35rem;line-height:1.12}.umc-side-button,.umc-back-link{display:flex;align-items:center;min-height:52px;padding:.78rem .9rem;border:1px solid rgba(110,220,255,.14);border-radius:12px;background:rgba(8,24,43,.58);color:#e3f5ff;text-decoration:none;font:inherit;font-weight:800;cursor:pointer;transition:.2s ease}.umc-side-button:hover,.umc-side-button.is-active,.umc-back-link:hover{background:linear-gradient(90deg,rgba(55,217,255,.20),rgba(55,217,255,.05));border-color:rgba(55,217,255,.46);box-shadow:inset 3px 0 0 var(--accent),0 0 20px rgba(55,217,255,.12)}.umc-back-link{margin-top:auto;justify-content:center}.umc-unit-main{min-width:0}.umc-unit-title-row{display:flex;align-items:center;gap:1.25rem;margin-bottom:1rem;padding:1rem 1.15rem;border:1px solid rgba(110,220,255,.14);border-radius:22px;background:linear-gradient(135deg,rgba(7,22,42,.75),rgba(4,12,24,.50))}.umc-unit-title-row h1{margin:0;font-size:clamp(2.2rem,4vw,4.1rem);letter-spacing:-.055em;line-height:1}.umc-unit-title-row p{margin:.5rem 0 0;color:#d2e7f7;font-size:1.1rem}.umc-lesson-path{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:.7rem;margin:0 0 1rem}.umc-lesson-node{position:relative;min-height:132px;padding:.65rem;border:1px solid rgba(110,220,255,.15);border-radius:14px;background:rgba(8,24,43,.62);color:#eaf8ff;text-align:center;cursor:pointer;transition:.2s ease;overflow:hidden}.umc-lesson-node::after{content:"";position:absolute;inset:auto 8px 8px 8px;height:2px;background:var(--lesson-accent,var(--accent));opacity:.52}.umc-lesson-node b{display:block;color:var(--lesson-accent,var(--accent));font-size:1.35rem}.umc-lesson-node i{display:grid;place-items:center;width:42px;height:42px;margin:.25rem auto;color:var(--lesson-accent,var(--accent));font-style:normal}.umc-lesson-node i svg{width:42px;height:42px;stroke:currentColor;fill:none;stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round}.umc-lesson-node span{display:block;font-size:.82rem;line-height:1.08}.umc-lesson-node strong{display:block;font-size:.9rem}.umc-lesson-node:hover,.umc-lesson-node.is-active{transform:translateY(-3px);border-color:color-mix(in srgb,var(--lesson-accent,var(--accent)) 65%,transparent);background:color-mix(in srgb,var(--lesson-accent,var(--accent)) 10%,rgba(8,24,43,.70));box-shadow:0 0 28px color-mix(in srgb,var(--lesson-accent,var(--accent)) 22%,transparent)}.umc-unit-content-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:1rem}.umc-main-feature,.umc-summary-card,.umc-dashboard-card,.umc-activity-card{position:relative;overflow:hidden;border:1px solid rgba(110,220,255,.16);border-radius:18px;background:linear-gradient(135deg,rgba(8,27,50,.86),rgba(4,12,24,.62));box-shadow:0 18px 60px rgba(0,0,0,.24)}.umc-main-feature{min-height:320px;padding:1.45rem}.umc-main-feature::after{content:"";position:absolute;right:-7rem;bottom:-9rem;width:26rem;height:26rem;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 16%,transparent),transparent 68%);pointer-events:none}.umc-main-feature h2{position:relative;margin:.2rem 0 .75rem;font-size:2rem}.umc-main-feature p{position:relative;color:#d4e8f7;line-height:1.65}.umc-large-copy{font-size:1.05rem}.umc-arc-flow{position:relative;display:flex;gap:.7rem;flex-wrap:wrap;margin-top:1.2rem}.umc-arc-flow span{padding:.55rem .7rem;border:1px solid rgba(110,220,255,.18);border-radius:999px;background:rgba(110,220,255,.06);font-weight:800}.umc-arc-flow i{color:var(--accent);font-style:normal;font-weight:900;align-self:center}.umc-summary-card{padding:1.25rem}.umc-metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.75rem}.umc-metric{padding:.9rem;border:1px solid rgba(110,220,255,.14);border-radius:14px;background:rgba(110,220,255,.055)}.umc-metric strong{display:block;color:var(--accent);font-size:1.35rem}.umc-metric span{color:var(--umc-muted);font-size:.82rem}.umc-dashboard-cards{display:grid;grid-template-columns:1fr 1fr 1.15fr;gap:1rem;margin-top:1rem}.umc-dashboard-card{padding:1.1rem}.umc-dashboard-card h3{margin:.25rem 0 .85rem;font-size:1.25rem}.umc-thinking-row{display:grid;grid-template-columns:5.6rem minmax(0,1fr) 2.4rem;gap:.65rem;align-items:center;margin:.58rem 0}.umc-thinking-label{font-size:.86rem;font-weight:850;color:#d7eafb}.umc-thinking-track{height:10px;border-radius:999px;background:rgba(110,220,255,.10);overflow:hidden;border:1px solid rgba(110,220,255,.08)}.umc-thinking-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--row-color,var(--accent)),color-mix(in srgb,var(--row-color,var(--accent)) 70%,#fff));box-shadow:0 0 14px color-mix(in srgb,var(--row-color,var(--accent)) 42%,transparent)}.umc-thinking-row b{color:#cfe6f6;font-size:.75rem}.umc-thinking-color-0{--row-color:#37d9ff}.umc-thinking-color-1{--row-color:#a56cff}.umc-thinking-color-2{--row-color:#2bd6d6}.umc-thinking-color-3{--row-color:#89f45b}.umc-thinking-color-4{--row-color:#ffc857}.umc-thinking-color-5{--row-color:#ff8b38}.umc-thinking-color-6{--row-color:#ff5bc8}
/* Lesson page */
.umc-lesson-shell-v2{max-width:1260px;margin:0 auto}.umc-lesson-hero-v2{display:flex;align-items:center;gap:1.2rem;margin-bottom:1rem;padding:1.2rem;border:1px solid rgba(110,220,255,.18);border-radius:22px;background:linear-gradient(135deg,rgba(7,22,42,.84),rgba(4,12,24,.62));box-shadow:0 20px 70px rgba(0,0,0,.24)}.umc-lesson-hero-v2 h1{margin:0;font-size:clamp(2rem,4vw,3.6rem);letter-spacing:-.05em}.umc-lesson-hero-v2 p{color:#d4e8f7}.umc-lesson-workflow{display:grid;grid-template-columns:repeat(6,1fr);gap:.5rem;margin-bottom:1rem}.umc-lesson-workflow span{padding:.72rem;border:1px solid rgba(110,220,255,.14);border-radius:999px;text-align:center;background:rgba(8,24,43,.54);font-weight:850;color:#a7bad0}.umc-lesson-workflow .is-active{color:#03111e;background:linear-gradient(135deg,var(--accent),#216dff)}.umc-activity-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(340px,1.1fr);gap:1rem}.umc-activity-card{padding:1.15rem}.umc-activity-card h2{margin:.25rem 0 .7rem}.umc-activity-card p,.umc-activity-card label{color:#cfe1f0;line-height:1.55}.umc-response-label{display:block;margin-bottom:.45rem;font-weight:850}.umc-activity-card textarea{width:100%;resize:vertical;border:1px solid rgba(110,220,255,.20);border-radius:14px;background:rgba(2,8,18,.6);color:#edf8ff;padding:.9rem;font:inherit;margin:.3rem 0 .7rem}.umc-feedback-box{margin-top:1rem;padding:1rem;border:1px solid rgba(137,244,91,.28);border-radius:16px;background:rgba(137,244,91,.06)}.umc-mini-visual{position:relative;min-height:270px;border-radius:18px;border:1px solid rgba(110,220,255,.13);background:radial-gradient(circle at 50% 55%,rgba(55,217,255,.20),transparent 60%),linear-gradient(180deg,rgba(55,217,255,.08),rgba(165,108,255,.06));overflow:hidden}.umc-mini-visual span{position:absolute;width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 18px var(--accent)}.umc-mini-visual span:nth-child(1){left:20%;top:30%}.umc-mini-visual span:nth-child(2){left:48%;top:22%}.umc-mini-visual span:nth-child(3){left:70%;top:44%}.umc-mini-visual span:nth-child(4){left:38%;top:66%}.umc-mini-visual span:nth-child(5){left:62%;top:72%}.about-cards{grid-template-columns:repeat(3,1fr)}
@media(max-width:1160px){.umc-chem-hero{grid-template-columns:110px 1fr}.umc-difference-card{grid-column:1/-1}.umc-unit-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.umc-unit-dashboard-v2{grid-template-columns:1fr}.umc-unit-sidebar{position:static;display:grid;grid-template-columns:repeat(2,1fr)}.umc-side-unit-card{grid-column:1/-1}.umc-back-link{grid-column:1/-1}.umc-unit-content-grid,.umc-dashboard-cards{grid-template-columns:1fr}.umc-subject-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.umc-platform-hero,.umc-chem-hero,.umc-unit-title-row,.umc-lesson-hero-v2{grid-template-columns:1fr;display:block}.umc-hero-icon,.umc-hex-emblem{margin-bottom:1rem}.umc-unit-card-grid,.umc-subject-grid,.umc-activity-grid{grid-template-columns:1fr}.umc-lesson-path{grid-template-columns:repeat(2,1fr)}.umc-unit-sidebar{grid-template-columns:1fr}.umc-metric-grid{grid-template-columns:1fr}.umc-lesson-workflow{grid-template-columns:repeat(2,1fr)}.umc-platform-hero h1,.umc-chem-copy h1{font-size:2.5rem}.umc-bottom-banner{flex-direction:column;align-items:flex-start}}
.umc-course-unit-card.has-image{background-size:cover;background-position:center}.umc-course-unit-card.has-image .umc-card-sheen{background:radial-gradient(circle at 78% 22%,color-mix(in srgb,var(--accent) 25%,transparent),transparent 48%),linear-gradient(120deg,rgba(4,12,24,.15) 0%,rgba(255,255,255,.04) 40%,rgba(4,12,24,.38) 90%)}

.umc-card-subtitle{margin:.15rem 0 .45rem;color:color-mix(in srgb,var(--accent) 72%,#fff);font-size:.82rem;font-weight:800;line-height:1.25}


/* v0.3.7 homepage split hero */
.umc-platform-hero-split{grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);align-items:stretch;gap:1.4rem}
.umc-platform-hero-left{display:grid;grid-template-columns:auto minmax(0,1fr);gap:1.4rem;align-items:center}
.umc-home-right-card{position:relative;z-index:1;padding:1.05rem;border:1px solid rgba(110,220,255,.18);border-radius:22px;background:linear-gradient(135deg,rgba(7,22,42,.76),rgba(3,11,22,.58));box-shadow:inset 0 1px 0 rgba(255,255,255,.04)}
.umc-home-right-card h2{margin:.15rem 0 .85rem;font-size:1.35rem;letter-spacing:-.03em}
.umc-home-feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem}
.umc-home-feature{display:grid;grid-template-columns:38px minmax(0,1fr);gap:.62rem;align-items:start;padding:.65rem;border:1px solid rgba(110,220,255,.12);border-radius:16px;background:rgba(110,220,255,.045)}
.umc-home-feature span{width:38px;height:38px;display:grid;place-items:center;border:1px solid rgba(55,217,255,.22);border-radius:14px;color:var(--accent);background:rgba(55,217,255,.055)}
.umc-home-feature svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.umc-home-feature strong{display:block;color:#edf8ff;font-size:.94rem;line-height:1.1}
.umc-home-feature p{margin:.22rem 0 0!important;color:var(--umc-muted);font-size:.82rem;line-height:1.35}
@media(max-width:1100px){.umc-platform-hero-split{grid-template-columns:1fr}.umc-home-feature-grid{grid-template-columns:1fr}}
@media(max-width:720px){.umc-platform-hero-left{grid-template-columns:1fr}.umc-subject-grid{grid-template-columns:1fr}.umc-unit-card-grid{grid-template-columns:1fr}.umc-chem-hero{grid-template-columns:1fr}.umc-unit-dashboard-v2{grid-template-columns:1fr}}

/* v0.3.9 editable imagery/features */
.umc-subject-card.has-image{background-size:cover;background-position:center}
.umc-subject-card.has-image .umc-card-sheen{background:radial-gradient(circle at 80% 15%,color-mix(in srgb,var(--accent) 24%,transparent),transparent 48%),linear-gradient(120deg,rgba(4,12,24,.08) 0%,rgba(255,255,255,.04) 38%,rgba(4,12,24,.42) 92%)}
.umc-chem-hero.has-image{background-size:cover;background-position:center;border:1px solid rgba(110,220,255,.14);border-radius:24px;padding:1.15rem;box-shadow:0 20px 70px rgba(0,0,0,.22)}
.umc-lesson-node.has-image{background-size:cover;background-position:center}
.umc-main-feature.has-image{background-size:cover;background-position:center}
.umc-feature-strip span b{font-weight:850}
.umc-feature-strip span svg{flex:0 0 auto}
/* v0.3.10 optional homepage course-card backgrounds */
.umc-subject-card.has-image{background-size:cover;background-position:center;}
.umc-subject-card.has-image::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,color-mix(in srgb,var(--accent) 24%,transparent),transparent 45%),linear-gradient(180deg,rgba(5,13,25,.05),rgba(5,13,25,.35));pointer-events:none;z-index:0}
.umc-subject-card.has-image>*{position:relative;z-index:1}

/* v0.3.11 homepage hero background image */
.umc-platform-hero.has-image{background-size:cover;background-position:center;border:1px solid rgba(110,220,255,.20);box-shadow:0 20px 80px rgba(0,0,0,.30), inset 0 1px 0 rgba(255,255,255,.04)}
.umc-platform-hero.has-image::before{background:radial-gradient(circle at 78% 18%, color-mix(in srgb,var(--accent) 14%, transparent), transparent 45%), linear-gradient(180deg,rgba(2,8,18,.04),rgba(2,8,18,.15))}

/* v0.3.13 mobile refinement pass */
@media (max-width: 980px) {
  .umc-platform-hub,
  .umc-chem-hub,
  .umc-unit-dashboard-v2,
  .umc-lesson-shell-v2 {
    width: 100%;
    max-width: 100%;
  }
  .umc-platform-hero,
  .umc-platform-hero-split {
    grid-template-columns: 1fr !important;
    padding: 1.2rem;
    border-radius: 22px;
  }
  .umc-platform-hero-left {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 1rem;
  }
  .umc-platform-hero h1 {
    max-width: none;
    font-size: clamp(2.05rem, 9vw, 3.35rem);
    line-height: 1;
    overflow-wrap: anywhere;
  }
  .umc-home-feature-grid {
    grid-template-columns: 1fr 1fr;
  }
  .umc-subject-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .umc-chem-hero,
  .umc-chem-hero.has-image {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 1rem;
    padding: 1rem;
  }
  .umc-difference-card {
    grid-column: 1 / -1;
  }
  .umc-hero-icon {
    width: 80px;
    border-radius: 22px;
  }
  .umc-chem-copy h1 {
    font-size: clamp(2.15rem, 8vw, 3.4rem);
  }
  .umc-chem-copy p {
    font-size: 1rem;
  }
  .umc-feature-strip {
    gap: .6rem;
    flex-wrap: wrap;
  }
  .umc-unit-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .umc-unit-dashboard-v2 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .umc-unit-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .55rem;
    order: 1;
  }
  .umc-side-unit-card,
  .umc-back-link {
    grid-column: 1 / -1;
  }
  .umc-unit-main {
    order: 2;
    min-width: 0;
  }
  .umc-unit-title-row {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: .9rem;
  }
  .umc-unit-title-row h1 {
    font-size: clamp(2rem, 7.5vw, 3.25rem);
  }
  .umc-lesson-path {
    display: flex !important;
    gap: .65rem;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    padding: .2rem .15rem .75rem;
    -webkit-overflow-scrolling: touch;
  }
  .umc-lesson-node {
    flex: 0 0 118px;
    min-height: 120px;
    scroll-snap-align: start;
  }
  .umc-unit-content-grid,
  .umc-dashboard-cards,
  .umc-activity-grid {
    grid-template-columns: 1fr;
  }
  .umc-main-feature {
    min-height: 260px;
  }
}

@media (max-width: 640px) {
  .umc-platform-hero-left {
    grid-template-columns: 1fr;
  }
  .umc-hex-emblem,
  .umc-hero-icon {
    width: 70px;
    margin-bottom: .35rem;
  }
  .umc-home-feature-grid,
  .umc-subject-grid,
  .umc-unit-card-grid {
    grid-template-columns: 1fr !important;
  }
  .umc-home-feature {
    grid-template-columns: 34px minmax(0, 1fr);
    padding: .6rem;
  }
  .umc-home-feature span {
    width: 34px;
    height: 34px;
  }
  .umc-subject-card,
  .umc-course-unit-card {
    min-height: 235px;
  }
  .umc-chem-hero,
  .umc-chem-hero.has-image {
    grid-template-columns: 1fr;
    border-radius: 20px;
  }
  .umc-chem-copy h1,
  .umc-platform-hero h1 {
    font-size: clamp(2rem, 12vw, 2.8rem);
  }
  .umc-difference-card {
    padding: .95rem;
  }
  .umc-difference-item {
    grid-template-columns: 36px minmax(0,1fr);
  }
  .umc-unit-sidebar {
    grid-template-columns: 1fr;
  }
  .umc-unit-title-row {
    grid-template-columns: 1fr;
    border-radius: 20px;
  }
  .umc-unit-title-row h1 {
    font-size: clamp(1.8rem, 10vw, 2.6rem);
    line-height: 1.02;
  }
  .umc-lesson-node {
    flex-basis: 104px;
    min-height: 108px;
    padding: .65rem .55rem;
  }
  .umc-lesson-node strong {
    font-size: .72rem;
  }
  .umc-main-feature,
  .umc-dashboard-card,
  .umc-summary-card {
    padding: 1rem;
    border-radius: 16px;
  }
  .umc-main-feature h2 {
    font-size: 1.55rem;
  }
  .umc-thinking-row {
    grid-template-columns: 4.8rem minmax(0,1fr) 2.2rem;
    gap: .45rem;
  }
  .umc-chip-row {
    gap: .36rem;
  }
  .umc-chip {
    font-size: .76rem;
    min-height: 29px;
  }
  .umc-lesson-workflow {
    grid-template-columns: 1fr 1fr;
  }
}

/* v0.3.14 mobile unit menu drawer */
.umc-mobile-unit-menu-toggle,
.umc-mobile-unit-menu-backdrop{display:none}

@media (max-width: 980px){
  .umc-mobile-unit-menu-toggle{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:.55rem;
    position:sticky;
    top:.55rem;
    z-index:80;
    width:100%;
    min-height:48px;
    padding:.8rem 1rem;
    border:1px solid color-mix(in srgb,var(--accent) 38%,transparent);
    border-radius:16px;
    background:linear-gradient(135deg,rgba(7,22,42,.92),rgba(4,12,24,.76));
    color:#edf8ff;
    box-shadow:0 14px 42px rgba(0,0,0,.32),0 0 24px color-mix(in srgb,var(--accent) 14%,transparent);
    font:inherit;
    font-weight:900;
    letter-spacing:.02em;
    cursor:pointer;
  }
  .umc-mobile-unit-menu-toggle span{
    color:var(--accent);
    font-size:1.15rem;
    line-height:1;
  }
  .umc-unit-dashboard-v2{
    position:relative;
    display:block!important;
  }
  .umc-unit-sidebar{
    position:fixed!important;
    inset:0 auto 0 0;
    z-index:120;
    width:min(86vw,360px);
    max-width:360px;
    height:100dvh;
    overflow-y:auto;
    display:flex!important;
    flex-direction:column!important;
    grid-template-columns:none!important;
    gap:.7rem;
    padding:1rem;
    background:
      radial-gradient(circle at 20% 0%,color-mix(in srgb,var(--accent) 16%,transparent),transparent 32%),
      linear-gradient(180deg,rgba(5,17,33,.98),rgba(2,8,18,.96));
    border-right:1px solid rgba(110,220,255,.22);
    box-shadow:28px 0 80px rgba(0,0,0,.55),0 0 34px color-mix(in srgb,var(--accent) 13%,transparent);
    transform:translateX(-108%);
    transition:transform .24s ease;
    -webkit-overflow-scrolling:touch;
  }
  .umc-unit-dashboard-v2.is-mobile-menu-open .umc-unit-sidebar{
    transform:translateX(0);
  }
  .umc-unit-dashboard-v2.is-mobile-menu-open .umc-mobile-unit-menu-toggle{
    border-color:color-mix(in srgb,var(--accent) 70%,transparent);
    box-shadow:0 0 28px color-mix(in srgb,var(--accent) 22%,transparent);
  }
  .umc-mobile-unit-menu-backdrop{
    display:block;
    position:fixed;
    inset:0;
    z-index:110;
    background:rgba(1,5,12,.64);
    backdrop-filter:blur(5px);
    opacity:0;
    pointer-events:none;
    transition:opacity .22s ease;
  }
  .umc-unit-dashboard-v2.is-mobile-menu-open .umc-mobile-unit-menu-backdrop{
    opacity:1;
    pointer-events:auto;
  }
  .umc-side-unit-card,
  .umc-back-link{
    grid-column:auto!important;
  }
  .umc-unit-sidebar .umc-side-button,
  .umc-unit-sidebar .umc-back-link{
    width:100%;
  }
  body.umc-mobile-menu-lock{
    overflow:hidden;
  }
}

@media (min-width: 981px){
  .umc-mobile-unit-menu-toggle,
  .umc-mobile-unit-menu-backdrop{display:none!important}
}

/* v0.3.16 Evidence Explorer */
.umc-evidence-explorer{max-width:1260px;margin:0 auto;padding:1.5rem clamp(.85rem,2vw,1.25rem) 4rem;color:#edf8ff}
.umc-evidence-hero{position:relative;overflow:hidden;border:1px solid rgba(110,220,255,.18);border-radius:26px;padding:clamp(1.25rem,3vw,2rem);background:radial-gradient(circle at 80% 18%,rgba(55,217,255,.16),transparent 42%),linear-gradient(135deg,rgba(7,22,42,.92),rgba(3,11,22,.78));box-shadow:0 22px 80px rgba(0,0,0,.26),inset 0 1px 0 rgba(255,255,255,.04);margin-bottom:1rem}
.umc-evidence-hero h1{font-size:clamp(2.15rem,5vw,4.3rem);line-height:.98;letter-spacing:-.06em;max-width:930px;margin:.2rem 0 .8rem;color:#f3f8ff}
.umc-evidence-hero p:not(.umc-kicker){max-width:850px;color:var(--umc-muted);font-size:1.05rem;line-height:1.55}
.umc-evidence-controls{position:sticky;top:0;z-index:8;display:grid;grid-template-columns:minmax(260px,1.35fr) repeat(3,minmax(160px,1fr));gap:.72rem;margin:1rem 0;padding:1rem;border:1px solid rgba(110,220,255,.14);border-radius:22px;background:linear-gradient(135deg,rgba(4,16,30,.94),rgba(3,10,20,.88));backdrop-filter:blur(10px);box-shadow:0 14px 50px rgba(0,0,0,.22)}
.umc-evidence-controls label{display:grid;gap:.28rem;color:#dcefff;font-weight:850;font-size:.78rem;letter-spacing:.02em;text-transform:uppercase}
.umc-evidence-controls input,.umc-evidence-controls select{width:100%;min-height:42px;border-radius:14px;border:1px solid rgba(110,220,255,.18);background:rgba(2,8,18,.74);color:#edf8ff;padding:.55rem .72rem;font:inherit;text-transform:none;letter-spacing:0}
.umc-evidence-search{grid-column:span 2}
.umc-evidence-controls .umc-button{align-self:end;min-height:42px;justify-content:center}
.umc-evidence-count{margin:.8rem 0 1rem;color:var(--umc-muted)}
.umc-evidence-count strong{color:var(--accent);font-size:1.2rem}
.umc-evidence-empty{padding:1.1rem;border:1px dashed rgba(110,220,255,.26);border-radius:18px;background:rgba(110,220,255,.05);color:var(--umc-muted);margin-bottom:1rem}
.umc-evidence-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
.umc-evidence-card{position:relative;overflow:hidden;border:1px solid color-mix(in srgb,var(--accent) 38%,rgba(110,220,255,.12));border-radius:22px;background:radial-gradient(circle at 86% 12%,color-mix(in srgb,var(--accent) 12%,transparent),transparent 42%),linear-gradient(180deg,rgba(9,27,48,.88),rgba(3,11,22,.86));box-shadow:0 18px 60px rgba(0,0,0,.20),inset 0 1px 0 rgba(255,255,255,.04);padding:1rem}
.umc-evidence-card[hidden]{display:none!important}
.umc-evidence-card-head{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center;color:var(--umc-muted);font-size:.82rem;margin-bottom:.6rem}
.umc-evidence-type{display:inline-flex;align-items:center;border:1px solid color-mix(in srgb,var(--accent) 44%,transparent);background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);font-weight:900;text-transform:uppercase;letter-spacing:.08em;border-radius:999px;padding:.22rem .55rem;font-size:.68rem}
.umc-evidence-card h2{margin:.1rem 0 .35rem;font-size:1.4rem;letter-spacing:-.03em;color:#f3f8ff}
.umc-evidence-subtitle{color:color-mix(in srgb,var(--accent) 66%,#fff);font-weight:850;margin:.1rem 0 .45rem}
.umc-evidence-summary{color:var(--umc-muted);line-height:1.48;margin:.35rem 0 .85rem}
.umc-evidence-groups{display:grid;gap:.7rem;margin:.85rem 0}
.umc-evidence-groups b,.umc-evidence-note b{display:block;margin-bottom:.35rem;color:#bdefff;text-transform:uppercase;letter-spacing:.08em;font-size:.72rem}
.umc-evidence-note{margin-top:.8rem;padding:.85rem;border:1px solid rgba(137,244,91,.18);border-radius:16px;background:rgba(137,244,91,.055)}
.umc-evidence-note p{color:var(--umc-muted);margin:0;line-height:1.45}
.umc-evidence-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.95rem}
@media(max-width:1050px){.umc-evidence-controls{grid-template-columns:repeat(2,minmax(0,1fr))}.umc-evidence-search{grid-column:1/-1}.umc-evidence-results{grid-template-columns:1fr}}
@media(max-width:640px){.umc-evidence-explorer{padding:.85rem .7rem 3rem}.umc-evidence-hero{border-radius:20px;padding:1rem}.umc-evidence-hero h1{font-size:clamp(2rem,10vw,2.85rem)}.umc-evidence-controls{position:relative;grid-template-columns:1fr;padding:.75rem;border-radius:18px}.umc-evidence-search{grid-column:auto}.umc-evidence-card{border-radius:18px;padding:.85rem}.umc-evidence-card h2{font-size:1.2rem}}

/* v0.4 Activity Builder / Activity Shell */
.umc-activity-shell{width:min(96vw,1760px);max-width:none;margin:0 auto;padding:clamp(10px,1.6vw,24px);} 
.umc-activity-topbar{display:flex;justify-content:space-between;gap:1rem;align-items:flex-start;margin:1rem 0 1.25rem;padding:1.1rem;border:1px solid rgba(115,221,255,.24);border-radius:24px;background:linear-gradient(135deg,rgba(12,35,66,.92),rgba(6,16,36,.92));box-shadow:0 18px 60px rgba(0,0,0,.28);}
.umc-activity-topbar h1{margin:.1rem 0 .35rem;color:#f3f8ff;font-size:clamp(2rem,4vw,4rem);line-height:1;}
.umc-activity-privacy{color:rgba(225,243,255,.76);max-width:780px;margin:0;}
.umc-activity-actions{display:flex;gap:.6rem;flex-wrap:wrap;justify-content:flex-end;}
.umc-btn,.umc-activity-print,.umc-activity-save-now{border:1px solid rgba(96,220,255,.45);border-radius:999px;background:linear-gradient(135deg,#29d3ff,#5d7cff);color:#031326;font-weight:900;padding:.75rem 1rem;cursor:pointer;text-decoration:none;}
.umc-btn.ghost,.umc-activity-save-now{background:rgba(255,255,255,.06);color:#dff5ff;}
.umc-activity-studentbar{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin:0 0 1rem;padding:.9rem 1rem;border:1px solid rgba(255,255,255,.12);border-radius:18px;background:rgba(255,255,255,.055);color:#e7f6ff;}
.umc-activity-studentbar label{display:flex;gap:.75rem;align-items:center;flex-wrap:wrap;font-weight:800;}
.umc-activity-studentbar input{border:1px solid rgba(150,220,255,.3);border-radius:12px;background:rgba(0,0,0,.2);color:#fff;padding:.55rem .7rem;}
.umc-activity-stage{border:1px solid rgba(255,255,255,.12);border-radius:24px;background:rgba(255,255,255,.045);box-shadow:0 14px 50px rgba(0,0,0,.22);overflow:hidden;}
.umc-integrated-activity{padding:1rem;}
.umc-activity-frame{display:block;width:100%;min-height:92vh;border:0;background:#fff;overflow:hidden;}
.umc-activity-report-panel{margin:1rem 0;padding:1rem;border-radius:20px;border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.05);color:#eaf7ff;}
.umc-activity-report-output{width:100%;min-height:150px;border-radius:14px;border:1px solid rgba(255,255,255,.14);background:rgba(0,0,0,.25);color:#fff;padding:1rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;}
@media(max-width:760px){.umc-activity-shell{width:100vw;padding:0}.umc-activity-topbar{display:block;border-radius:0;margin:0}.umc-activity-actions{justify-content:flex-start;margin-top:1rem}.umc-activity-studentbar{display:block;border-radius:0;margin:0}.umc-activity-stage{border-left:0;border-right:0;border-radius:0}.umc-integrated-activity{padding:.55rem}.umc-activity-frame{min-height:calc(100vh - 130px)}}
@media print{.umc-site-header,.umc-activity-actions,.umc-activity-report-panel{display:none!important}.umc-activity-shell{padding:0}.umc-activity-stage{border:0;box-shadow:none;background:#fff}.umc-activity-topbar{box-shadow:none;background:#fff;color:#111;border:0}.umc-activity-topbar h1{color:#111}}

/* v0.4.3 Activity full-width and focus iframe layouts */
.umc-activity-layout-wide,
.umc-activity-layout-focus_iframe{
  width:100vw;
  max-width:none;
  margin-left:calc(50% - 50vw);
  margin-right:calc(50% - 50vw);
  padding:0 clamp(8px,1vw,18px) clamp(16px,1.4vw,28px);
}
.umc-activity-layout-focus_iframe{
  padding:0;
}
.umc-activity-layout-wide .umc-activity-topbar,
.umc-activity-layout-wide .umc-activity-studentbar,
.umc-activity-layout-wide .umc-activity-report-panel{
  width:min(96vw,1760px);
  margin-left:auto;
  margin-right:auto;
}
.umc-activity-layout-wide .umc-activity-stage,
.umc-activity-layout-focus_iframe .umc-activity-stage{
  width:100%;
  border-left:0;
  border-right:0;
  border-radius:0;
  background:transparent;
  box-shadow:none;
}
.umc-activity-layout-wide .umc-activity-frame,
.umc-activity-layout-focus_iframe .umc-activity-frame{
  width:100%;
  min-height:calc(100vh - 64px);
  border:0;
  background:#061525;
}
.umc-activity-layout-focus_iframe .umc-activity-frame{
  display:block;
  min-height:calc(100vh - 54px);
}
@media(max-width:760px){
  .umc-activity-layout-wide,
  .umc-activity-layout-focus_iframe{
    width:100vw;
    margin-left:calc(50% - 50vw);
    margin-right:calc(50% - 50vw);
    padding:0;
  }
  .umc-activity-layout-wide .umc-activity-frame,
  .umc-activity-layout-focus_iframe .umc-activity-frame{
    min-height:calc(100vh - 50px);
  }
}

/* v0.4.5 Activity view-only containment and comfortable gutters. */
.um-page-card.um-usemath-activity-page,
.um-page-card:has(.umc-activity-shell){
  padding:0 !important;
  border:0 !important;
  background:transparent !important;
  box-shadow:none !important;
  overflow:visible !important;
}
.um-page-card.um-usemath-activity-page::after,
.um-page-card:has(.umc-activity-shell)::after,
.um-page-card.um-usemath-activity-page > .um-page-header,
.um-page-card:has(.umc-activity-shell) > .um-page-header{
  display:none !important;
}
.um-page-card.um-usemath-activity-page .um-page-content,
.um-page-card:has(.umc-activity-shell) .um-page-content{
  z-index:auto;
}
.um-page-card.um-usemath-activity-page .umc-activity-shell,
.um-page-card:has(.umc-activity-shell) .umc-activity-shell{
  margin-top:0;
}
.umc-activity-shell{
  width:min(100%, 1560px);
  max-width:calc(100vw - clamp(16px, 2vw, 36px));
  margin-left:auto;
  margin-right:auto;
  padding:clamp(12px,1.6vw,24px);
}
.umc-activity-stage{
  max-width:100%;
  overflow:hidden;
}
.umc-integrated-activity{
  max-width:100%;
  overflow-x:hidden;
}
.umc-integrated-activity > header,
.umc-integrated-activity > main,
.umc-integrated-activity > .wrap{
  max-width:100%;
}
.umc-activity-layout-wide,
.umc-activity-layout-focus_iframe{
  width:min(100%, 1560px) !important;
  max-width:calc(100vw - clamp(16px, 2vw, 36px)) !important;
  margin-left:auto !important;
  margin-right:auto !important;
  padding:clamp(12px,1.6vw,24px) !important;
}
.umc-activity-layout-wide .umc-activity-topbar,
.umc-activity-layout-wide .umc-activity-studentbar,
.umc-activity-layout-wide .umc-activity-report-panel{
  width:100% !important;
}
.umc-activity-layout-wide .umc-activity-stage,
.umc-activity-layout-focus_iframe .umc-activity-stage{
  width:100%;
  border:1px solid rgba(115,221,255,.18) !important;
  border-radius:24px !important;
  background:linear-gradient(135deg,rgba(8,27,50,.42),rgba(4,12,24,.34)) !important;
  box-shadow:0 18px 60px rgba(0,0,0,.22) !important;
  overflow:hidden;
}
.umc-activity-layout-wide .umc-activity-frame,
.umc-activity-layout-focus_iframe .umc-activity-frame,
.umc-activity-frame{
  width:100%;
  max-width:100%;
  border:0;
  background:#061525;
}
.umc-activity-layout-focus_iframe .umc-activity-frame{
  min-height:calc(100vh - 84px);
}
@media(max-width:760px){
  .um-page-card.um-usemath-activity-page,
  .um-page-card:has(.umc-activity-shell){border-radius:0!important}
  .umc-activity-shell,
  .umc-activity-layout-wide,
  .umc-activity-layout-focus_iframe{
    width:100% !important;
    max-width:100% !important;
    margin-left:0 !important;
    margin-right:0 !important;
    padding:8px !important;
  }
  .umc-activity-layout-wide .umc-activity-stage,
  .umc-activity-layout-focus_iframe .umc-activity-stage,
  .umc-activity-stage{
    border-radius:18px !important;
  }
}

/* v0.4.7 card-builder activity runtime */
.umc-card-builder-activity{display:grid;gap:18px;width:100%}
.umc-card-jump{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 4px}
.umc-card-jump a{display:inline-flex;align-items:center;text-decoration:none;font-weight:900;font-size:.84rem;color:#d7f6ff;border:1px solid rgba(115,221,255,.22);border-radius:999px;background:rgba(255,255,255,.045);padding:7px 11px}.umc-card-jump a:hover{border-color:var(--section-accent,#31d7ff);color:#fff}
.umc-builder-card{--section-accent:#31d7ff;position:relative;overflow:hidden;border:1px solid color-mix(in srgb,var(--section-accent) 36%,transparent);border-radius:24px;background:linear-gradient(135deg,rgba(8,25,43,.92),rgba(5,13,25,.78));box-shadow:0 18px 60px rgba(0,0,0,.24);color:#eef7ff}.umc-builder-card:before{content:"";position:absolute;inset:0 0 auto;height:3px;background:linear-gradient(90deg,var(--section-accent),transparent 72%)}
.umc-builder-card-head{padding:20px 24px;border-bottom:1px solid color-mix(in srgb,var(--section-accent) 22%,transparent);background:linear-gradient(135deg,color-mix(in srgb,var(--section-accent) 14%,transparent),rgba(255,255,255,.025))}.umc-builder-card-head h2{margin:8px 0 6px;color:#fff;font-size:clamp(1.35rem,2.3vw,2rem);line-height:1.1;letter-spacing:-.035em}.umc-card-prompt{max-width:980px;color:#cce4f8;margin:6px 0 0}
.umc-builder-card-body{padding:20px 24px}.umc-builder-card-labels{display:flex;gap:8px;flex-wrap:wrap}.umc-card-pill{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:999px;background:rgba(255,255,255,.055);border:1px solid color-mix(in srgb,var(--section-accent) 30%,transparent);font-size:.82rem;color:#ddf8ff;font-weight:900;text-transform:capitalize}.umc-card-pill.points{background:var(--section-accent);color:#06111f}.umc-card-pill.required{color:#fff;background:rgba(255,189,74,.12);border-color:rgba(255,189,74,.38)}
.umc-card-custom-content{max-width:100%;overflow-x:auto}.umc-card-response-box{margin-top:14px;border:1px solid rgba(148,197,255,.2);border-radius:18px;background:rgba(255,255,255,.055);padding:14px}.umc-card-response-box label{display:block;font-weight:950;color:#fff}.umc-card-response-box textarea,.umc-ai-feedback-panel textarea{display:block;width:100%;margin-top:8px;min-height:132px;border:1px solid rgba(148,197,255,.28);border-radius:14px;padding:11px 12px;background:rgba(4,12,23,.72);color:#f4fbff;outline:none;resize:vertical}.umc-card-response-box textarea:focus,.umc-ai-feedback-panel textarea:focus{border-color:var(--section-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--section-accent) 18%,transparent)}
.umc-card-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:14px}.umc-card-status{font-weight:900;color:#7dffab}.umc-card-status.is-warning{color:#ffbd4a}.umc-card-status.is-error{color:#ff837f}.umc-ai-placeholder-note{margin:14px 0;padding:12px 14px;border:1px dashed rgba(165,102,255,.38);border-left:5px solid #a566ff;border-radius:16px;background:rgba(165,102,255,.08);color:#e8ddff}.umc-ai-feedback-panel{margin-top:14px;border:1px solid rgba(165,102,255,.35);border-radius:18px;background:linear-gradient(135deg,rgba(165,102,255,.13),rgba(49,215,255,.05));padding:16px}.umc-ai-feedback-panel h3{margin:0 0 8px;color:#fff}.umc-ai-feedback-text{color:#e9ddff}.umc-card-ledger-panel{border-radius:24px;background:linear-gradient(135deg,rgba(8,25,43,.92),rgba(5,13,25,.78));border:1px solid rgba(115,221,255,.22)}
@media(max-width:760px){.umc-card-jump{overflow-x:auto;flex-wrap:nowrap;padding-bottom:3px}.umc-card-jump a{white-space:nowrap}.umc-builder-card{border-radius:18px}.umc-builder-card-head,.umc-builder-card-body{padding:16px}.umc-card-actions .umc-btn,.umc-card-ledger-panel .umc-btn{width:100%;justify-content:center}.umc-card-response-box,.umc-ai-feedback-panel{padding:12px;border-radius:16px}}

/* v0.5.4 public status visibility and action cleanup */
.umc-subject-card.is-coming-soon,
.umc-subject-card.is-locked,
.umc-course-unit-card.is-coming-soon,
.umc-course-unit-card.is-locked{
  cursor:not-allowed;
  filter:saturate(.72);
}
.umc-subject-card.is-coming-soon:hover,
.umc-subject-card.is-locked:hover,
.umc-course-unit-card.is-coming-soon:hover,
.umc-course-unit-card.is-locked:hover{
  transform:none;
}
.umc-subject-card.is-locked,
.umc-course-unit-card.is-locked{
  opacity:.72;
}
.umc-subject-card.is-coming-soon,
.umc-course-unit-card.is-coming-soon{
  opacity:.82;
}
.umc-lesson-node[disabled],
.umc-lesson-node.is-coming-soon,
.umc-lesson-node.is-locked{
  cursor:not-allowed;
  opacity:.68;
  filter:saturate(.72);
}
.umc-lesson-node[disabled]:hover,
.umc-lesson-node.is-coming-soon:hover,
.umc-lesson-node.is-locked:hover{
  transform:none;
  box-shadow:none;
}
.umc-lesson-status-badge{
  display:inline-flex;
  justify-content:center;
  align-items:center;
  width:max-content;
  max-width:100%;
  margin:.45rem auto 0;
  padding:.22rem .48rem;
  border:1px solid color-mix(in srgb,var(--lesson-accent,var(--accent)) 38%,transparent);
  border-radius:999px;
  background:color-mix(in srgb,var(--lesson-accent,var(--accent)) 9%,transparent);
  color:var(--lesson-accent,var(--accent));
  font-size:.68rem;
  font-style:normal;
  font-weight:950;
  letter-spacing:.04em;
  text-transform:uppercase;
}

/* v0.5.6 Activity launch buttons on lesson overview */
.umc-main-feature .umc-hero-links{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:.7rem;
}
.umc-lesson-launch-stack{
  display:flex;
  flex-direction:column;
  align-items:stretch;
  gap:.65rem;
  width:min(100%, 360px);
}
.umc-activity-launch{
  width:100%;
  min-height:48px;
  border-color:color-mix(in srgb,var(--activity-accent,var(--accent)) 42%,transparent);
}
.umc-activity-launch.umc-button-primary{
  background:linear-gradient(135deg,var(--activity-accent,var(--accent)),#216dff);
  color:#041020;
}
.umc-activity-launch-disabled{
  justify-content:space-between;
  background:rgba(255,255,255,.055);
  color:#d8e9f5;
  border-color:rgba(255,255,255,.16);
  opacity:.56;
  filter:saturate(.45);
  cursor:not-allowed;
  pointer-events:auto;
}
.umc-activity-launch-disabled:hover{
  cursor:not-allowed;
  transform:none;
  box-shadow:none;
  border-color:rgba(255,255,255,.18);
}
.umc-activity-launch-disabled em{
  font-style:normal;
  font-size:.72rem;
  font-weight:950;
  text-transform:uppercase;
  letter-spacing:.08em;
  padding:.25rem .45rem;
  border-radius:999px;
  background:rgba(255,255,255,.08);
  color:#aebfca;
}
.umc-activity-launch-disabled.is-coming-soon em{
  color:#d5edf7;
}
.umc-activity-launch-disabled.is-locked em{
  color:#ffd4d4;
}

/* v0.5.8 Access scaffolding */
.umc-access-gate{
  max-width:920px;
  margin:2rem auto;
  padding:clamp(1.25rem,3vw,2.25rem);
  border:1px solid rgba(255,255,255,.16);
  border-radius:24px;
  background:linear-gradient(135deg,rgba(7,22,42,.92),rgba(4,12,24,.78));
  box-shadow:0 22px 70px rgba(0,0,0,.32);
  color:#eef8ff;
}
.umc-access-gate h1{margin:.2rem 0 .65rem;font-size:clamp(2rem,4vw,3.5rem);line-height:1;letter-spacing:-.05em}
.umc-access-gate p{color:#cfe5f4;font-size:1.05rem}
.umc-lesson-node.is-access-denied{
  opacity:.62;
  filter:saturate(.45);
  cursor:not-allowed;
}
.umc-lesson-node.is-access-denied:hover{
  transform:none;
  box-shadow:none;
}
.umc-activity-launch-disabled.is-access-denied em{
  color:#ffd4d4;
}

/* v0.5.9 Evidence Explorer access-visible locked records */
.umc-evidence-card.is-access-denied{
  opacity:.78;
  filter:saturate(.62);
}
.umc-evidence-access-badge{
  display:inline-flex;
  align-items:center;
  border:1px solid rgba(255,212,212,.34);
  background:rgba(255,99,92,.11);
  color:#ffd4d4;
  border-radius:999px;
  padding:.22rem .55rem;
  font-size:.68rem;
  font-weight:900;
  text-transform:uppercase;
  letter-spacing:.08em;
}
.umc-evidence-disabled-action{
  cursor:not-allowed!important;
  opacity:.62!important;
  filter:saturate(.45)!important;
  transform:none!important;
  box-shadow:none!important;
}
.umc-evidence-disabled-action:hover{
  transform:none!important;
  box-shadow:none!important;
}


/* v0.8.1: Standard activity report controls */
.umc-standard-report-controls{
  margin:24px 0 0;
  padding:22px;
  border:1px solid rgba(55,217,255,.24);
  border-radius:24px;
  background:linear-gradient(135deg,rgba(8,31,54,.92),rgba(5,14,27,.86));
  box-shadow:0 18px 60px rgba(0,0,0,.25);
}
.umc-standard-report-head h2{
  margin:0 0 6px;
  color:#fff;
  font-size:clamp(1.45rem,2.2vw,2.1rem);
  letter-spacing:-.035em;
}
.umc-standard-report-head p{
  color:#cce3f7;
}
.umc-standard-report-actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  align-items:center;
  margin:14px 0;
}
.umc-standard-report-status{
  color:#7dffab;
  font-weight:850;
}
.umc-standard-report-status.is-error{
  color:#ff8b8b;
}
.umc-standard-report-ready{
  border:1px solid rgba(49,215,255,.28);
  border-left:6px solid #31d7ff;
  border-radius:18px;
  background:rgba(49,215,255,.07);
  padding:18px 20px;
  color:#eaffff;
}
.umc-standard-report-ready strong{
  display:block;
  color:#fff;
  font-size:clamp(1.45rem,2.4vw,2.05rem);
  line-height:1.05;
  letter-spacing:-.035em;
  margin-bottom:8px;
}
.umc-standard-report-ready span{
  color:#cfe6fb;
}
.umc-standard-report-ready.is-ready{
  border-color:rgba(125,255,154,.35);
  border-left-color:#7dffab;
  background:rgba(125,255,154,.08);
}
.umc-standard-ready-chips{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:10px;
}
.umc-standard-ready-chips span{
  display:inline-flex;
  border:1px solid rgba(148,197,255,.24);
  border-radius:999px;
  padding:5px 9px;
  background:rgba(255,255,255,.055);
  color:#e8f8ff;
  font-weight:850;
  font-size:.86rem;
}
.umc-standard-report-hidden-source{
  position:absolute;
  left:-99999px;
  top:0;
  width:8.5in;
  pointer-events:none;
  opacity:0;
  overflow:hidden;
}
.umc-standard-report-print.report-ready-glow{
  box-sizing:border-box;
  border:4px solid transparent!important;
  min-height:42px;
  padding:8px 14px;
  color:#06111f!important;
  font-weight:950;
  line-height:1.1;
  text-shadow:none!important;
  background:
    linear-gradient(135deg,#ffffff,#dff7ff) padding-box,
    conic-gradient(from 0deg,#ff3b30,#ff9500,#ffcc00,#34c759,#00c7ff,#007aff,#af52de,#ff2d55,#ff3b30) border-box!important;
  box-shadow:
    0 0 0 1px rgba(255,255,255,.20),
    0 0 10px rgba(49,215,255,.48),
    0 8px 22px rgba(0,0,0,.20)!important;
  animation:umc-readable-rainbow-glow 2.2s linear infinite!important;
}
.umc-standard-report-print.report-ready-glow:hover{
  transform:translateY(-1px);
  box-shadow:
    0 0 0 1px rgba(255,255,255,.28),
    0 0 14px rgba(49,215,255,.58),
    0 10px 26px rgba(0,0,0,.24)!important;
}
@keyframes umc-readable-rainbow-glow{
  0%{filter:hue-rotate(0deg);}
  100%{filter:hue-rotate(360deg);}
}
@media (prefers-reduced-motion:reduce){
  .umc-standard-report-print.report-ready-glow{animation:none!important;}
}


/* v0.8.2: report-control ready/stale state */
.umc-standard-report-controls.is-report-dirty .umc-standard-report-status{
  color:#ffbd4a;
}
.umc-standard-report-ready.is-stale{
  border-color:rgba(255,189,74,.38);
  border-left-color:#ffbd4a;
  background:rgba(255,189,74,.08);
}
.umc-standard-report-generate.report-generate-glow{
  box-sizing:border-box;
  border:4px solid transparent!important;
  min-height:42px;
  padding:8px 14px;
  color:#06111f!important;
  font-weight:950;
  line-height:1.1;
  text-shadow:none!important;
  background:
    linear-gradient(135deg,#ffffff,#e9fbff) padding-box,
    conic-gradient(from 0deg,#ff3b30,#ff9500,#ffcc00,#34c759,#00c7ff,#007aff,#af52de,#ff2d55,#ff3b30) border-box!important;
  box-shadow:
    0 0 0 1px rgba(255,255,255,.20),
    0 0 10px rgba(49,215,255,.48),
    0 8px 22px rgba(0,0,0,.20)!important;
  animation:umc-readable-rainbow-glow 2.2s linear infinite!important;
}
.umc-standard-report-generate.report-generate-glow:hover{
  transform:translateY(-1px);
  box-shadow:
    0 0 0 1px rgba(255,255,255,.28),
    0 0 14px rgba(49,215,255,.58),
    0 10px 26px rgba(0,0,0,.24)!important;
}
@media (prefers-reduced-motion:reduce){
  .umc-standard-report-generate.report-generate-glow{animation:none!important;}
}

/* v0.8.7 local browser work controls */
.umc-activity-localbar{display:flex;gap:.65rem;align-items:center;justify-content:flex-end;margin:.4rem 0 .7rem;color:var(--umc-muted)}.umc-clear-local-work{appearance:none;border:1px solid rgba(115,221,255,.26);border-radius:999px;background:rgba(7,22,42,.35);color:var(--accent);font-weight:800;font-size:.78rem;padding:.42rem .72rem;cursor:pointer}.umc-clear-local-work:hover{background:rgba(55,217,255,.12)}.umc-activity-local-status{font-size:.8rem;color:var(--umc-muted)}