:root{--blue:#1782be;--blue-deep:#0f5e8c;--blue-navy:#0c4568;--sky:#eaf5fc;--sky-deep:#cfe9f8;--orange:#e96e24;--orange-deep:#c4570f;--green:#91bc3e;--green-deep:#6e9427;--ink:#213645;--ink-soft:#54677a;--line:#dde8f0;--r:12px;--accent:#1782be;--accent-deep:#0f5e8c}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:"Nunito",system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.6}body.bg-green{--accent:#91bc3e;--accent-deep:#6e9427}body.bg-orange{--accent:#e96e24;--accent-deep:#c4570f}.color-orange{color:var(--orange)}img{max-width:100%}a{color:var(--blue-deep)}.wrap{max-width:1120px;margin:0 auto;padding:0 24px}.round{font-family:"Quicksand",sans-serif;font-weight:700;line-height:1.2;letter-spacing:-.01em}header{position:sticky;top:0;z-index:50;background:#fff;box-shadow:0 1px 0 var(--line),0 2px 10px rgb(23 130 190 / .06)}.nav{display:flex;align-items:center;gap:16px;height:70px}.brand{display:flex;align-items:center;gap:10px;cursor:pointer;text-decoration:none;line-height:1}.brand img{width:40px;height:40px;display:block;border-radius:8px}.brand span{font-family:"Quicksand",sans-serif;font-weight:700;font-size:1.2rem;color:var(--blue-deep)}.nav .sitelink{margin-left:auto;font-family:"Quicksand",sans-serif;font-weight:700;font-size:.92rem;color:var(--blue-deep);text-decoration:none}.topic-hero{background:linear-gradient(180deg,var(--sky),#fff);border-bottom:1px solid var(--line);padding:40px 0 32px}.crumb{font-family:"Quicksand",sans-serif;font-weight:600;font-size:.92rem;color:var(--ink-soft);margin-bottom:12px}.crumb a{cursor:pointer;text-decoration:none}.topic-hero h1{font-size:clamp(1.7rem, 3.4vw, 2.5rem);color:var(--blue-navy);margin-bottom:8px}.topic-hero .sub{font-family:"Quicksand",sans-serif;font-weight:700;color:var(--accent-deep);font-size:1.18rem;margin-bottom:14px}.topic-hero .note{color:var(--ink-soft);font-size:.98rem;max-width:44rem}.badge-tag{display:inline-flex;align-items:center;font-family:"Nunito",sans-serif;font-size:.78rem;font-weight:800;color:#fff;background:var(--accent);border-radius:999px;padding:4px 14px;margin-bottom:14px}main{padding:44px 0 64px}.unit-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}.unit-grid.col-3{grid-template-columns:1fr 1fr 1fr}.unit-grid.col-1{grid-template-columns:1fr;max-width:640px}.unit{margin-bottom:8px}.unit-head{display:flex;align-items:baseline;gap:10px;margin-bottom:20px;border-bottom:2px solid var(--line);padding-bottom:10px}.unit-head .unit-letter{flex:none;width:34px;height:34px;border-radius:9px;color:#fff;display:flex;align-items:center;justify-content:center;font-family:"Quicksand",sans-serif;font-weight:700}.unit-head h2{font-family:"Quicksand",sans-serif;font-weight:700;font-size:1.15rem;color:var(--blue-navy)}.activity-group{margin-bottom:22px}.activity-group h3{font-family:"Quicksand",sans-serif;font-weight:700;font-size:1rem;color:var(--blue-navy);margin-bottom:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.group-status{font-family:"Nunito",sans-serif;font-weight:800;font-size:.68rem;letter-spacing:.02em;text-transform:uppercase;border-radius:999px;padding:3px 9px}.group-status.live{background:#eaf7dc;color:var(--green-deep)}.group-status.pending{background:#f1f5f8;color:var(--ink-soft)}.activity-list{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:12px}.activity-list a{text-decoration:none}.activity-row{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:13px 16px;background:#fff;border:none;border-bottom:1px solid var(--line);max-width:100%;cursor:pointer;font-family:"Quicksand",sans-serif;transition:background 0.12s}.activity-row:last-child{border-bottom:none}.activity-list a:nth-child(even) .activity-row:not(.last-viewed):not(:hover),.activity-row:nth-child(even){background:#f7fbfe}.activity-row:hover{background:var(--sky)}.activity-row:focus-visible{outline:2px solid var(--blue);outline-offset:-2px}.activity-row.last-viewed{background:#eaf7dc;box-shadow:inset 4px 0 0 var(--green-deep)}.activity-name{font-weight:800;font-size:.93rem;flex:1 1 auto;min-width:0;word-break:break-word;color:var(--ink)}.activity-num{color:var(--ink-soft);font-weight:700;margin-right:4px}.row-arrow{flex:none;color:var(--green-deep);font-weight:700;font-size:1rem}.activity-row.is-pending{cursor:default;opacity:.62}.activity-row.is-pending:hover{background:inherit}.activity-row.is-pending:nth-child(even){background:#f7fbfe}.activity-row.is-pending .row-arrow{color:var(--ink-soft)}footer{background:var(--blue-navy);color:#eaf5fc;padding:26px 0;margin-top:20px}footer .wrap{display:flex;align-items:center;gap:20px;flex-wrap:wrap}footer a{color:#fff;text-decoration:none;font-family:"Quicksand",sans-serif;font-weight:600;font-size:.9rem}footer small{margin-left:auto;color:#bbd9ea;font-size:.82rem}@media (max-width:820px){.unit-grid{grid-template-columns:1fr}footer .wrap{flex-direction:column;align-items:flex-start}footer small{margin-left:0}}.intro-overlay{position:fixed;inset:0;background:rgb(15 27 38 / .55);z-index:200;display:none;align-items:center;justify-content:center;padding:20px}.intro-overlay.open{display:flex}.intro-card{background:#fff;border-radius:18px;padding:32px;max-width:26rem;text-align:center;box-shadow:0 24px 60px rgb(0 0 0 / .25)}.intro-card .intro-message{font-family:"Quicksand",sans-serif;font-weight:700;font-size:1.2rem;color:var(--blue-navy);margin-bottom:22px;line-height:1.4}.btn{display:inline-block;font-family:"Quicksand",sans-serif;font-weight:700;font-size:1rem;padding:12px 26px;border-radius:999px;border:none;cursor:pointer;text-decoration:none;transition:background 0.12s,transform 0.12s}.btn:hover{transform:translateY(-1px)}.btn:focus-visible{outline:2px solid var(--blue-navy);outline-offset:2px}.btn-green{background:var(--green);color:#fff;box-shadow:0 2px 0 var(--green-deep)}.btn-green:hover{background:#9cc94a}.unit-a{background:#1782be}.unit-b{background:#e96e24}.unit-c{background:#91bc3e}.coming-soon{color:var(--ink-soft);font-style:italic;padding:6px 2px}.tippy-box[data-theme~="success"]{background-color:var(--green-deep);font-weight:700}.tippy-box[data-theme~="success"][data-placement^="top"]>.tippy-arrow::before{border-top-color:var(--green-deep)}.tippy-box[data-theme~="success"][data-placement^="bottom"]>.tippy-arrow::before{border-bottom-color:var(--green-deep)}.tippy-box[data-theme~="success"][data-placement^="left"]>.tippy-arrow::before{border-left-color:var(--green-deep)}.tippy-box[data-theme~="success"][data-placement^="right"]>.tippy-arrow::before{border-right-color:var(--green-deep)}.course-name-overlay.hidden{display:none}.course-name-overlay{position:fixed;inset:0;background:rgb(15 27 38 / .55);z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}.course-name{width:400px;background-color:#fff;border-radius:10px;top:50px;left:calc(50% - 200px);z-index:10;padding:10px}.course-name-input{text-align:left}.course-name-input input{width:calc(100% - 13px);border:2px solid #0070c0;outline:none;border-radius:10px;font-size:14px;padding:3px 5px}.course-name-btns{margin-top:10px;text-align:right}.course-name-btns button{border:none;outline:none;border-radius:15px;padding:5px 15px;color:#fff;cursor:pointer}.course-name-cancel-btn{margin-right:5px;background-color:var(--blue-navy)}.course-name-ok-btn{background-color:var(--green-deep)}