:root{color:#e2e8f0;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;background:#020817;font-family:Segoe UI,Roboto,sans-serif;font-weight:400;line-height:1.5}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:radial-gradient(circle at top,#0e749047,#0000 35%),linear-gradient(#020817,#0f172a 30%,#111827);min-width:320px;min-height:100vh;margin:0}button,input{font:inherit}#root{min-height:100vh}h1,h2,h3,h4,p{margin-top:0}:root{--ink:#243238;--muted:#718096;--green:#58cc02;--green-dark:#46a900;--blue:#1899d6;--line:#e5e7eb}.duo-app{min-height:100vh;color:var(--ink);background:#f7f9fb}.course-topbar{border-bottom:1px solid var(--line);z-index:5;background:#fff;justify-content:space-between;align-items:center;height:72px;padding:0 max(24px,50% - 560px);display:flex;position:sticky;top:0}.brand{color:#374151;cursor:pointer;background:0 0;border:0;align-items:center;gap:8px;font-size:21px;font-weight:800;display:flex}.brand-mark{background:var(--green);color:#fff;border-radius:10px;place-items:center;width:34px;height:34px;font-size:23px;display:grid}.brand-accent{color:var(--green-dark)}.top-stats{color:#52636b;align-items:center;gap:24px;font-weight:800;display:flex}.avatar,.profile-avatar{color:#4b5563;background:#eef2f5;border:0;border-radius:50%;place-items:center;font-weight:800;display:grid}.avatar{width:38px;height:38px}.course-layout{grid-template-columns:minmax(0,1fr) 300px;gap:34px;width:min(1080px,100% - 36px);margin:0 auto;padding:34px 0 70px;display:grid}.welcome-row{justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px;display:flex}.eyebrow,.side-label,.unit-level,.lesson-level,.exercise-type{color:#8b99a1;letter-spacing:.13em;text-transform:uppercase;font-size:11px;font-weight:800}.welcome-row h1{color:#1f3036;margin:5px 0 0;font-size:30px}.streak-card{color:#9a6700;background:#fffaf0;border:1px solid #ffe4a8;border-radius:14px;flex-direction:column;gap:3px;padding:12px 16px;display:flex}.streak-card span{color:#a78b54;font-size:12px}.goal-card{border:1px solid var(--line);background:#fff;border-radius:16px;align-items:center;gap:14px;margin-bottom:28px;padding:17px 20px;display:flex}.goal-icon{font-size:28px}.goal-copy{flex-direction:column;flex:1;gap:4px;display:flex}.goal-copy strong{font-size:15px}.goal-copy span{color:var(--muted);font-size:13px}.goal-xp{color:#d28a00;font-size:13px;font-weight:800}.goal-bar{background:#edf1f3;border-radius:20px;height:9px;overflow:hidden}.goal-bar span{border-radius:inherit;background:var(--green);height:100%;display:block}.path-title{justify-content:space-between;align-items:center;margin-bottom:14px;font-size:19px;font-weight:800;display:flex}.small-link{color:var(--blue);cursor:pointer;background:0 0;border:0;font-size:13px;font-weight:800}.unit-card{border:1px solid var(--line);background:#fff;border-radius:18px;margin-bottom:22px;overflow:hidden;box-shadow:0 2px 4px #1e323c0a}.unit-header{color:#fff;justify-content:space-between;gap:20px;padding:22px 24px;display:flex}.unit-card.green .unit-header{background:linear-gradient(110deg,#58cc02,#75d82a)}.unit-card.blue .unit-header{background:linear-gradient(110deg,#1899d6,#42b7e9)}.unit-card.purple .unit-header{background:linear-gradient(110deg,#7c4dce,#a77ae7)}.unit-card.orange .unit-header{background:linear-gradient(110deg,#e99600,#f8b82e)}.unit-header .unit-level{color:#ffffffd9}.unit-header h2{margin:5px 0;font-size:21px}.unit-header p{color:#ffffffde;margin:0;font-size:13px}.unit-badge{background:#ffffff38;border-radius:20px;align-self:flex-start;padding:7px 11px;font-size:13px;font-weight:800}.lesson-nodes{grid-template-columns:repeat(2,1fr);gap:12px;padding:18px;display:grid}.lesson-node{text-align:left;color:var(--ink);cursor:pointer;background:#fff;border:1px solid #e8edef;border-radius:14px;align-items:center;gap:12px;padding:14px;transition:all .18s;display:flex}.lesson-node:hover:not(:disabled){border-color:var(--green);transform:translateY(-2px)}.lesson-node.completed{background:#f7fff1;border-color:#9cdb7b}.lesson-node.locked{opacity:.5;cursor:not-allowed}.node-icon{background:#edf8e8;border-radius:13px;place-items:center;width:42px;height:42px;font-size:21px;display:grid}.lesson-node.completed .node-icon{background:var(--green);color:#fff;font-weight:900}.lesson-node strong,.lesson-node small{display:block}.lesson-node small{color:#98a5aa;margin-top:4px;font-size:12px}.course-sidebar{flex-direction:column;gap:16px;display:flex}.side-card{border:1px solid var(--line);background:#fff;border-radius:17px;padding:22px}.profile-avatar{width:58px;height:58px;color:var(--green-dark);background:#e2f5d9;margin-bottom:13px;font-size:18px}.side-card>strong{font-size:17px;display:block}.side-card>span:not(.side-label){color:var(--muted);margin-top:4px;font-size:13px;display:block}.side-divider{background:var(--line);height:1px;margin:18px 0}.stat-line{justify-content:space-between;margin-bottom:9px;font-size:13px;display:flex}.continue-card{border-top:4px solid var(--blue)}.continue-card h3{margin:9px 0 5px}.side-card p{color:var(--muted);font-size:13px;line-height:1.55}.primary-button,.secondary-button,.text-button{cursor:pointer;border:0;border-radius:12px;padding:13px 20px;font-weight:800}.primary-button{background:var(--green);color:#fff;box-shadow:0 3px 0 var(--green-dark)}.primary-button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.secondary-button{color:#1683b7;background:#edf8fc}.wide{width:100%;margin-top:8px}@media (width<=620px){.course-topbar{height:64px;padding:0 12px;padding-top:env(safe-area-inset-top)}.top-stats{gap:8px;font-size:12px}.top-stats span:nth-child(2){display:none}.course-layout{width:calc(100% - 20px);padding-top:22px}.welcome-row{flex-direction:column;align-items:flex-start}.welcome-row h1{font-size:26px}.streak-card{width:100%}.lesson-nodes{grid-template-columns:1fr}.course-sidebar{display:flex}.unit-header{padding:18px}.unit-header h2{font-size:18px}.unit-header p{font-size:12px}.lesson-node{min-height:70px}.exercise-card{padding:20px}.lesson-content{padding-top:28px}.lesson-heading h1{font-size:24px}.answer-options button,.word-bank button,.primary-button,.secondary-button{min-height:48px}.reward-row{grid-template-columns:1fr}.coach-form{flex-direction:column}.lesson-topbar{height:64px;padding-top:env(safe-area-inset-top)}}