:root{--bg: #121214;--panel: #202024;--card: #29292e;--line: #323238;--text: #e1e1e6;--muted: #a8a8b3;--green: #00b37e;--green-deep: #00875f;--amber: #fba94c;--red: #f75a68;--code: #0d0d10;color-scheme:dark;font-family:Outfit,Segoe UI,sans-serif}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%;background:#0c0c0e;color:var(--text)}button,a{font-family:inherit}a{color:inherit}.app{width:min(820px,100%);min-height:100dvh;margin:0 auto;background:var(--bg)}.screen{min-height:100dvh;padding:28px 22px 48px}.top{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.top.compact{align-items:center}.brand{margin:0 0 6px;color:var(--green);font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}h1{margin:0;font-size:32px;line-height:1.1}.lede{margin:8px 0 0;max-width:46ch;color:var(--muted);line-height:1.45}.icon-button{width:44px;height:44px;display:grid;place-items:center;border:0;border-radius:8px;background:var(--line);color:var(--text);text-decoration:none;cursor:pointer}.stat-line{margin:22px 0 0;color:var(--muted);font-size:14px}.unlock-toggle{width:100%;margin-top:18px;min-height:52px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid #3a3a42;border-radius:12px;background:var(--card);color:var(--text);font-size:16px;font-weight:650;cursor:pointer}.unlock-toggle .switch{width:46px;height:28px;flex:none;border-radius:99px;background:#3a3a42;position:relative}.unlock-toggle .switch:after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:#fff;transition:transform .15s ease}.unlock-toggle.on{border-color:#1f6b4f}.unlock-toggle.on .switch{background:var(--green)}.unlock-toggle.on .switch:after{transform:translate(18px)}.track-list{display:grid;gap:14px;margin-top:18px}.track-card{background:var(--card);border-radius:12px;padding:18px;border-top:3px solid var(--green)}.track-card.lang-javascript{border-top-color:#f7df1e}.track-card.lang-java{border-top-color:#f89820}.track-card-top,.track-card-foot{display:flex;justify-content:space-between;gap:12px;align-items:center}.track-card h2{margin:0;font-size:22px}.track-card p{color:var(--muted);line-height:1.45}.track-card-foot{margin-top:8px}.track-card-foot span,.track-card-top span{color:var(--muted);font-size:13px}.meter{height:6px;border-radius:99px;background:#3a3a42;overflow:hidden}.meter span{display:block;height:100%;background:var(--green)}.btn,.btn.ghost{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 14px;border-radius:8px;border:0;background:var(--green);color:#fff;font-weight:650;text-decoration:none;cursor:pointer}.btn.small{min-height:36px;font-size:14px}.btn.ghost{background:transparent;color:var(--text);border:1px solid #3f3f46}.btn:focus-visible,.icon-button:focus-visible,.option:focus-visible{outline:2px solid var(--green);outline-offset:2px}.level-block{margin-top:28px}.level-label{margin:0 0 10px;font-size:13px;letter-spacing:.08em;text-transform:uppercase}.level-label.basic{color:var(--green)}.level-label.intermediate{color:var(--amber)}.level-label.advanced{color:var(--red)}.path{list-style:none;margin:0;padding:0;display:grid;gap:10px}.path li{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;background:var(--card);border-radius:12px;padding:14px}.path li.locked{opacity:.55}.step{width:42px;height:42px;display:grid;place-items:center;border-radius:10px;background:var(--line);color:var(--green);font-weight:700}.path h3{margin:0 0 4px;font-size:17px}.path p,.meta,.empty{margin:0;color:var(--muted);line-height:1.4}.meta{margin-top:6px;font-size:13px}.lock{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.quiz{padding-bottom:108px}.quiz-head h1{font-size:24px}.quiz-title{display:flex;gap:12px;align-items:flex-start}.quiz-count{display:flex;justify-content:space-between;margin:16px 0 8px;color:var(--muted);font-size:14px}.quiz-body{margin-top:18px}.code-wrap{border-radius:12px;overflow:hidden;background:var(--code);border:1px solid #2a2a30}.code-bar{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.06em}.code-bar button{border:0;background:transparent;color:var(--text);cursor:pointer}.code{margin:0;padding:0 0 12px;overflow:auto;font-family:IBM Plex Mono,ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;line-height:1.55}.code-line{display:flex;min-width:max-content}.ln{width:42px;flex:none;text-align:right;padding-right:12px;color:#5c5c66;-webkit-user-select:none;user-select:none}.code .keyword{color:#7ee0c0}.code .string{color:#f0c7a0}.code .number{color:#f7c97e}.code .comment{color:#6f6f7a}.ask{margin:18px 0 12px;font-size:20px;line-height:1.35}.options{display:grid;gap:10px}.option{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;padding:12px;border-radius:10px;border:1px solid #3a3a42;background:var(--card);color:var(--text);cursor:pointer}.option.selected{border-color:var(--green);background:#16352c}.option.correct{border-color:var(--green);background:#14573f}.option.wrong{border-color:var(--red);background:#4a2228}.letter{width:28px;height:28px;flex:none;display:grid;place-items:center;border-radius:7px;background:var(--line);font-weight:700}.option-text{white-space:pre-wrap;line-height:1.45;padding-top:3px}.hint{color:var(--amber)}.why{margin-top:16px;padding:16px;border-radius:12px;background:#17261f;border:1px solid #1f6b4f}.why h3{margin:0 0 8px;color:var(--green);font-size:14px;letter-spacing:.04em;text-transform:uppercase}.why p,.review p{margin:8px 0 0;line-height:1.5}.why-answer{font-weight:700;white-space:pre-wrap}.dock{position:sticky;bottom:0;margin:0 -22px;padding:16px 22px calc(16px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--bg) 28%)}.dock .btn{width:100%}.score-card{margin-top:22px;padding:22px;border-radius:14px;background:var(--card)}.score-card.passed{box-shadow:inset 0 0 0 1px #1f6b4f}.score{margin:0;font-size:56px;font-weight:700;line-height:1}.score span{font-size:24px;color:var(--muted)}.finish-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.review{margin-top:28px}.review h2{font-size:20px}.review details{margin-top:10px;background:var(--card);border-radius:12px;padding:12px 14px}.review summary{display:flex;justify-content:space-between;gap:12px;cursor:pointer;font-weight:650}.review pre{overflow:auto;padding:12px;border-radius:8px;background:var(--code);font-family:IBM Plex Mono,ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px}.history{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:10px}.history li,.empty{background:var(--card);border-radius:12px;padding:14px}.history li{display:flex;justify-content:space-between;gap:12px;align-items:center}.history h2{margin:0 0 4px;font-size:17px}.history p{margin:0;color:var(--muted)}.history strong.good{color:var(--green)}.modal-back{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:grid;place-items:center;padding:20px}.modal{width:min(420px,100%);background:var(--panel);border-radius:14px;padding:20px}.modal h2{margin:0;font-size:22px}.modal p{color:var(--muted);line-height:1.45}.modal-actions{display:flex;justify-content:flex-end;gap:8px}@media(max-width:640px){h1{font-size:28px}.track-card-foot,.path li{align-items:stretch}.path li{grid-template-columns:auto 1fr}.path li .btn,.path li .lock{grid-column:2;justify-self:start}.track-card-foot{flex-direction:column;align-items:stretch}}