:root{--bg: #f7fbff;--ink: #172033;--muted: #617089;--line: #dfe8f3;--green: #58cc02;--green-dark: #45a302;--blue: #1cb0f6;--yellow: #ffc800;--orange: #ff8f1f;--purple: #ce82ff;--panel: #ffffff;--shadow: 0 14px 30px rgba(23, 32, 51, .1);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 10% 10%,rgba(255,200,0,.16),transparent 26rem),linear-gradient(180deg,#f7fbff,#eef7ff);color:var(--ink)}a{color:inherit;text-decoration:none}button,textarea{font:inherit}.site-shell{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:24px 0 48px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0 26px}.site-footer{display:flex;align-items:center;justify-content:center;gap:18px;flex-wrap:wrap;margin-top:56px;padding:24px 0 0;border-top:2px solid var(--line);color:var(--muted);font-size:.92rem;font-weight:800}.site-footer a{color:var(--ink)}.site-footer a:hover{color:var(--blue)}.footer-button{display:inline-flex;align-items:center;min-height:38px;padding:0 14px;border:2px solid var(--line);border-radius:999px;background:#fff;box-shadow:0 4px #d7e4ef}.topbar-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}.brand{display:flex;align-items:center;gap:12px;font-weight:900;letter-spacing:0}.brand-mark{display:grid;width:42px;height:42px;place-items:center;border:3px solid var(--green-dark);border-radius:14px;background:var(--green);color:#fff;box-shadow:0 5px 0 var(--green-dark)}.nav{display:flex;gap:8px;flex-wrap:wrap}.nav a{padding:10px 14px;border:2px solid transparent;border-radius:999px;color:var(--muted);font-weight:800}.nav a:hover,.nav a[aria-current=page]{border-color:var(--line);background:#fff;color:var(--ink)}.hero{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:end;margin-bottom:30px}.eyebrow{margin:0 0 8px;color:var(--green-dark);font-size:.84rem;font-weight:900;text-transform:uppercase}h1{margin:0;max-width:760px;font-size:clamp(2rem,4vw,4.2rem);line-height:1;letter-spacing:0}.lede{margin:14px 0 0;max-width:660px;color:var(--muted);font-size:1.1rem;line-height:1.6}.lesson-description{color:#7b8798;font-size:.98rem;font-style:italic}.progress-pill{display:inline-flex;align-items:center;min-height:48px;padding:12px 18px;border:2px solid var(--line);border-radius:999px;background:#fff;font-weight:900;box-shadow:0 5px #d7e4ef;white-space:nowrap}.nav-progress{min-height:44px;padding:10px 16px}.lesson-label{margin:0;max-width:none;font-size:1.05rem;line-height:1}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border:0;border-radius:16px;background:var(--green);color:#fff;font-weight:900;box-shadow:0 5px 0 var(--green-dark);cursor:pointer}.button:hover{transform:translateY(1px);box-shadow:0 4px 0 var(--green-dark)}.button.secondary{border:2px solid var(--line);background:#fff;color:var(--ink);box-shadow:0 5px #d7e4ef}.unit{margin:0 0 38px}.unit-heading{display:grid;gap:4px;margin-bottom:18px}.unit-heading h2{margin:0;font-size:1.36rem;line-height:1.1}.unit-heading span{color:var(--muted);font-size:.92rem;font-weight:800}.path{position:relative;display:flex;flex-wrap:wrap;gap:30px 44px;align-items:center;padding:10px 0 18px}.lesson-node{position:relative;z-index:1;display:grid;width:144px;min-height:114px;place-items:center;padding:16px 14px;border:3px solid #d7e4ef;border-radius:32px;background:#fff;box-shadow:0 7px #d7e4ef;text-align:center;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease;animation:path-bob 4.8s ease-in-out infinite;animation-delay:calc(var(--step) * -.28s)}.lesson-node:after{position:absolute;top:50%;left:calc(100% + 3px);z-index:-1;width:42px;height:8px;border-radius:999px;background:repeating-linear-gradient(90deg,#b8d7f1 0 12px,transparent 12px 20px);content:"";transform:translateY(-50%);animation:trail-slide 1.8s linear infinite}.lesson-node:last-child:after{display:none}.lesson-node:hover{transform:translateY(calc(var(--offset) + 2px));box-shadow:0 5px #d7e4ef}.lesson-node.completed{border-color:var(--green);box-shadow:0 7px 0 var(--green-dark)}.lesson-node.current{border-color:var(--yellow);box-shadow:0 7px #d9a800;animation:path-bob 4.8s ease-in-out infinite,current-pop 1.7s ease-in-out infinite}.node-index{display:grid;width:46px;height:46px;place-items:center;margin-bottom:10px;border-radius:18px;background:#eaf7e5;color:var(--green-dark);font-weight:900}.lesson-node.current .node-index{background:#fff4b8;color:#8a6800}.lesson-node h3{margin:0;font-size:1.08rem;line-height:1.2}@keyframes path-bob{0%,to{transform:translateY(var(--offset))}50%{transform:translateY(calc(var(--offset) - 4px))}}@keyframes trail-slide{0%{background-position:0 0}to{background-position:20px 0}}@keyframes current-pop{0%,to{border-color:var(--yellow)}50%{border-color:var(--orange)}}.lesson-grid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:22px;align-items:start}.lesson-panel,.side-stack,.phrase-card,.glossary-panel{border:3px solid var(--line);border-radius:28px;background:var(--panel);box-shadow:var(--shadow)}.lesson-panel{padding:26px}.lesson-section+.lesson-section{margin-top:26px;padding-top:24px;border-top:2px solid var(--line)}.lesson-section h2,.side-stack h2,.phrase-card h2{margin:0 0 10px;font-size:1.05rem}.lesson-section p{margin:0;line-height:1.7}.lesson-copy{color:#7b8798;font-size:.98rem;font-style:italic}.prompt-copy{margin-bottom:14px}.english-line{display:block;margin-top:10px;color:var(--blue);font-weight:900}textarea{width:100%;min-height:142px;resize:vertical;padding:16px;border:3px solid var(--line);border-radius:18px;outline:none;line-height:1.5}textarea:focus{border-color:var(--blue)}.check-list{display:grid;gap:10px;margin:14px 0 0;padding:0;list-style:none}.check-list li{padding:12px 14px;border-radius:16px;background:#f3f8fd;color:var(--muted);font-weight:700}.side-stack{display:grid;gap:18px;padding:22px;position:sticky;top:18px}.actions{display:flex;gap:12px;flex-wrap:wrap}.status-note{color:var(--muted);font-weight:800}.phrase-list{display:grid;gap:18px}.phrase-card{padding:22px}.phrase-card .answer{min-height:52px;margin:12px 0;padding:14px;border-radius:18px;background:#f3f8fd;color:var(--ink)}.empty-answer{color:var(--muted);font-style:italic}.glossary-layout{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:22px;align-items:start}.term-wall{columns:3 180px;column-gap:14px}.term-card{display:inline-block;width:100%;margin:0 0 14px;padding:16px;border:3px solid var(--line);border-radius:22px;background:#fff;box-shadow:0 5px #d7e4ef;cursor:pointer;break-inside:avoid;text-align:left}.term-card.active{border-color:var(--blue);box-shadow:0 5px #0b8fc9}.term-card strong{display:block;margin-bottom:8px;font-size:1rem}.term-card span{color:var(--muted);font-size:.9rem;line-height:1.35}.glossary-panel{position:sticky;top:18px;max-height:calc(100vh - 36px);overflow:auto;padding:24px}.glossary-content{color:var(--ink);line-height:1.65}.glossary-content a{color:var(--blue);font-weight:800}.glossary-content code{padding:2px 5px;border-radius:6px;background:#eef4fb}.glossary-content blockquote{margin:12px 0;padding-left:14px;border-left:4px solid var(--yellow);color:var(--muted)}.draft-badge{display:inline-flex;width:fit-content;padding:6px 10px;border-radius:999px;background:#fff4d2;color:#8a6800;font-size:.82rem;font-weight:900}@media(max-width:760px){.site-shell{width:min(100% - 20px,1120px);padding-top:12px}.topbar,.hero,.lesson-grid,.glossary-layout{grid-template-columns:1fr}.topbar{align-items:flex-start}.hero{align-items:start}.side-stack,.glossary-panel{position:static}.glossary-panel{position:fixed;inset:auto 0 0;z-index:10;display:none;max-height:84vh;border-radius:28px 28px 0 0;box-shadow:0 -18px 34px #1720332e}.glossary-panel.open{display:block}}