@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Fira+Code:wght@400;500&display=swap');
:root{--ink:#102a2a;--muted:#687b7b;--green:#19a974;--green2:#087f5b;--blue:#3178c6;--mint:#e9f8f2;--line:#dce9e5;--bg:#f5faf8;--white:#fff;--shadow:0 24px 70px rgba(20,75,62,.13)}*{box-sizing:border-box}body{margin:0;font-family:'DM Sans',sans-serif;color:var(--ink);background:var(--bg);font-size:16px}button,textarea,input{font:inherit}.hidden{display:none!important}.welcome-shell{min-height:100vh;display:grid;place-items:center;padding:28px;background:radial-gradient(circle at 15% 20%,#dff8ef 0,transparent 30%),radial-gradient(circle at 90% 85%,#e1effd 0,transparent 32%),#f7fbfa}.welcome-card{width:min(980px,100%);padding:36px 46px 48px;background:rgba(255,255,255,.9);border:1px solid #e2eeea;border-radius:30px;box-shadow:var(--shadow)}.brand{display:flex;align-items:center;gap:10px;font-size:1.15rem;font-weight:800}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;color:#fff;background:linear-gradient(135deg,var(--green),var(--blue));font:700 .85rem 'Fira Code'}.welcome-copy{text-align:center;max-width:700px;margin:65px auto 40px}.eyebrow{display:inline-block;color:var(--green2);font-weight:700;font-size:.8rem;letter-spacing:.13em;text-transform:uppercase}.welcome-copy h1{font-size:clamp(2.6rem,7vw,5rem);letter-spacing:-.06em;line-height:.97;margin:15px 0 22px}.welcome-copy h1 em{font-style:normal;color:var(--green)}.welcome-copy p{color:var(--muted);font-size:1.12rem}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.choice-card{display:grid;grid-template-columns:auto 1fr auto;gap:16px;text-align:left;align-items:center;padding:22px;border:1px solid var(--line);border-radius:17px;background:#fff;color:var(--ink);cursor:pointer;transition:.2s}.choice-card:hover{transform:translateY(-3px);border-color:var(--green);box-shadow:0 12px 30px rgba(25,169,116,.12)}.choice-card strong,.choice-card small{display:block}.choice-card strong{font-size:1rem}.choice-card small{color:var(--muted);margin-top:5px}.choice-card b{font-size:1.4rem;color:var(--green)}.choice-icon{display:grid;place-items:center;width:46px;height:46px;border-radius:13px;background:var(--mint);color:var(--green2);font-size:1.3rem}.continue-btn{display:block;margin:20px auto 0;border:0;background:transparent;color:var(--green2);font-weight:700;cursor:pointer}.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:270px;padding:28px 20px;background:#0e2b2a;color:#fff;display:flex;flex-direction:column}.sidebar .brand{padding:0 10px 28px}.sidebar nav{display:grid;gap:6px}.nav-btn{width:100%;display:flex;align-items:center;gap:12px;border:0;border-radius:11px;padding:13px;color:#b9cfca;background:transparent;text-align:left;cursor:pointer}.nav-btn:hover,.nav-btn.active{background:#183d3a;color:#fff}.nav-btn.active{box-shadow:inset 3px 0 var(--green)}.nav-btn.locked{opacity:.48;cursor:not-allowed}.nav-icon{width:24px;text-align:center}.nav-btn .lock{margin-left:auto}.side-progress{margin-top:auto;padding:16px;border:1px solid #2c4b48;border-radius:14px;background:#153532}.side-progress>div:first-child{display:flex;justify-content:space-between;font-size:.85rem}.progress-track{height:7px;background:#294d49;border-radius:10px;margin:12px 0 8px;overflow:hidden}.progress-track i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--green),#54d6c2);border-radius:inherit;transition:.35s}.side-progress small{color:#9ab6b1}.text-btn{margin:14px 0 0;border:0;color:#9ab6b1;background:transparent;cursor:pointer}.mobile-header{display:none}.content{margin-left:270px;min-height:100vh;padding:52px clamp(26px,6vw,78px)}.page-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:30px}.page-head h1{font-size:clamp(2rem,4vw,3.25rem);letter-spacing:-.045em;margin:5px 0}.page-head p{color:var(--muted);margin:0;max-width:660px}.pill{display:inline-flex;align-items:center;gap:7px;border-radius:100px;padding:7px 11px;background:var(--mint);color:var(--green2);font-size:.8rem;font-weight:700}.grid{display:grid;gap:18px}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 7px 25px rgba(25,70,60,.04)}.lesson-card{position:relative}.lesson-card.done{border-color:#9ed9c4}.lesson-num{color:var(--green);font:600 .8rem 'Fira Code';letter-spacing:.08em}.lesson-card h2{margin:9px 0}.lesson-card p{color:var(--muted);line-height:1.65}.code{position:relative;margin:18px 0;padding:18px;border-radius:12px;background:#0c2528;color:#d8f5ea;font:500 .87rem/1.65 'Fira Code';white-space:pre-wrap;overflow-x:auto}.code .kw{color:#71b7ff}.code .str{color:#8fe3a6}.code .cm{color:#789c95}.practice-box{padding-top:16px;border-top:1px solid var(--line)}.practice-box label{display:block;font-weight:700;margin-bottom:9px}.practice-box input,.practice-box textarea{width:100%;padding:12px 13px;border:1px solid #cadbd6;border-radius:10px;resize:vertical}.lesson-actions{display:flex;justify-content:space-between;align-items:center;margin-top:15px;gap:10px}.btn{border:0;border-radius:10px;padding:11px 16px;background:var(--green);color:#fff;font-weight:700;cursor:pointer}.btn:hover{background:var(--green2)}.btn.secondary{background:#edf5f3;color:var(--ink)}.complete-btn.done{background:#e0f5ec;color:#087f5b}.feedback{font-size:.85rem;color:var(--muted)}.quiz-wrap{max-width:790px}.quiz-progress{display:flex;gap:7px;margin-bottom:22px}.quiz-progress i{height:6px;flex:1;border-radius:9px;background:#dce9e5}.quiz-progress i.on{background:var(--green)}.question-card h2{font-size:1.55rem}.answers{display:grid;gap:10px;margin-top:23px}.answer{padding:15px;text-align:left;border:1px solid var(--line);border-radius:11px;background:#fff;cursor:pointer}.answer:hover{border-color:var(--green)}.answer.selected{border:2px solid var(--green);background:var(--mint)}.quiz-next{margin-top:20px;float:right}.result{text-align:center;padding:42px}.score-ring{display:grid;place-items:center;width:130px;height:130px;margin:0 auto 22px;border-radius:50%;background:conic-gradient(var(--green) var(--score),#e0ebe8 0);position:relative}.score-ring:before{content:'';position:absolute;width:98px;height:98px;border-radius:50%;background:#fff}.score-ring strong{position:relative;font-size:2rem}.path-card{border-left:5px solid var(--blue)}.path-card h2{margin-top:5px}.practice-list{grid-template-columns:repeat(2,minmax(0,1fr))}.practice-card textarea{min-height:95px;font-family:'Fira Code'}.status-grid{grid-template-columns:repeat(3,1fr)}.stat strong{display:block;font-size:1.65rem;margin:8px 0}.stat span{color:var(--muted)}.wide{grid-column:1/-1}.unlock-list{display:flex;flex-wrap:wrap;gap:9px;margin-top:15px}.unlock-chip{padding:8px 11px;border-radius:9px;background:#e6f7f0;color:#087f5b;font-weight:600}.unlock-chip.locked{background:#eef1f1;color:#85918f}.path-steps{position:relative;display:grid;gap:14px}.path-step{display:flex;gap:16px;align-items:center;padding:18px;border:1px solid var(--line);border-radius:13px}.path-step b{display:grid;place-items:center;min-width:36px;height:36px;border-radius:50%;background:var(--mint);color:var(--green2)}.path-step.current{border-color:var(--blue);background:#f3f8fe}.empty-state{text-align:center;padding:55px}.empty-state .choice-icon{margin:0 auto}.locked-panel{text-align:center;padding:60px}.locked-panel h2{margin-top:17px}#toast{position:fixed;right:24px;bottom:24px;z-index:20;padding:13px 18px;border-radius:10px;background:#102a2a;color:#fff;opacity:0;transform:translateY(12px);pointer-events:none;transition:.25s}#toast.show{opacity:1;transform:none}@media(max-width:850px){.sidebar{transform:translateX(-100%);transition:.25s;z-index:10}.sidebar.open{transform:none}.mobile-header{display:flex;position:sticky;top:0;z-index:8;justify-content:space-between;align-items:center;padding:14px 20px;background:#fff;border-bottom:1px solid var(--line)}.mobile-header button{border:0;background:var(--mint);border-radius:9px;padding:8px 11px}.content{margin-left:0;padding:30px 20px}.lesson-grid,.practice-list,.status-grid{grid-template-columns:1fr}.welcome-card{padding:28px 22px}.welcome-copy{margin:45px auto 30px}.choice-grid{grid-template-columns:1fr}.page-head{align-items:start;flex-direction:column}}@media(max-width:480px){.welcome-shell{padding:12px}.welcome-card{border-radius:20px}.choice-card{padding:17px}.content{padding:25px 15px}.card{padding:19px}}