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var(--border);background:var(--surface);cursor:pointer;max-width:280px;color:var(--text);border-radius:12px;flex:1;align-items:center;gap:10px;padding:12px 14px;display:flex}.pager-btn.next{text-align:right;justify-content:flex-end}.pager-btn:hover{border-color:var(--border-strong);color:var(--text)}.pager-btn.hot{border-color:var(--accent);background:var(--accent);color:var(--accent-ink);box-shadow:0 0 0 4px var(--accent-soft)}.pager-btn.hot:hover{background:var(--accent-hover);color:var(--accent-ink)}.pager-kicker{color:var(--text-3);font-size:12px;display:block}.pager-btn.hot .pager-kicker{color:var(--accent-ink);font-weight:600}.pager-title{white-space:nowrap;text-overflow:ellipsis;max-width:200px;font-size:13.5px;font-weight:500;display:block;overflow:hidden}.pager-btn.hot .pager-title{font-weight:600}.split-handle{z-index:5;cursor:col-resize;background:linear-gradient(var(--border), var(--border)) center / 1px 100% no-repeat;flex:none;width:9px;margin:0 -4px;position:relative}.split-handle:hover,.split-handle[data-separator=active],.split-handle[data-resize-handle-active]{background:linear-gradient(var(--accent), var(--accent)) center / 2px 100% no-repeat}.work-panel{background:var(--surface)}.workspace{background:var(--surface);flex-direction:column;min-width:0;height:100%;display:flex}.tabs{border-bottom:1px solid var(--border);flex:none;align-items:stretch;gap:2px;height:44px;padding:0 10px;display:flex}.tab{color:var(--text-3);cursor:pointer;background:0 0;border:0;align-items:center;gap:7px;padding:0 12px;font:500 12.5px JetBrains Mono,ui-monospace,monospace;display:flex;box-shadow:inset 0 -2px #0000}.tab.active{color:var(--text);box-shadow:inset 0 -2px 0 var(--accent)}.tab-note{color:var(--text-3);align-self:center;margin-left:auto;font-size:12px}.editor-stage{background:var(--editor-bg);flex:1;min-height:0;position:relative}.editor-stage>section,.editor-stage .monaco-editor{height:100%!important}.editor-fallback{color:var(--text-3);white-space:pre;margin:0;padding:16px 20px;font:13.5px/22px JetBrains Mono,ui-monospace,monospace;overflow:hidden}.runbar{border-top:1px solid var(--border);flex:none;align-items:center;gap:8px;height:56px;padding:0 14px;display:flex}.runbar-spacer{flex:1}.text-btn,.ghost-btn{height:34px;color:var(--text-2);cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:6px;padding:0 10px;font-size:13px;font-weight:500;display:inline-flex}.ghost-btn{border:1px solid var(--border);background:var(--surface);height:30px;padding:0 12px}.text-btn:hover,.ghost-btn:hover{background:var(--surface-2);color:var(--text);border-color:var(--border-strong)}.kbd-hint{color:var(--text-3);margin-right:4px;font-size:12px}.run-btn,.ship-btn{cursor:pointer;border-radius:9px;align-items:center;gap:7px;height:36px;padding:0 14px;font-size:13.5px;font-weight:600;display:inline-flex}.run-btn{border:1px solid var(--border-strong);background:var(--surface)}.run-btn:hover{background:var(--surface-2)}.ship-btn{background-color:var(--accent);color:var(--accent-ink);background-image:linear-gradient(110deg,#0000 38%,#ffffff8c 50%,#0000 62%);background-position:120% 0;background-repeat:no-repeat;background-size:260% 100%;border:0;padding:0 16px;transition:background-position .7s,background-color .15s;box-shadow:inset 0 1px #ffffff59}.ship-btn:hover{background-color:var(--accent-hover);background-position:-20% 0}.run-btn:disabled,.ship-btn:disabled{opacity:.55;cursor:default}.tests{border-top:1px solid var(--border);background:var(--surface);flex-direction:column;flex:none;height:300px;min-height:0;display:flex}.tests-bar{border-bottom:1px solid var(--border);flex:none;align-items:center;gap:8px;height:38px;padding:0 16px;display:flex}.tests-bar span:first-child{color:var(--text-2);font-size:12.5px;font-weight:600}.tests-summary{color:var(--text-3);font-variant-numeric:tabular-nums;margin-left:auto;font-size:12.5px;font-weight:500}.tests-summary.view-running,.tests-summary.view-failed{color:var(--text-2)}.tests-summary.view-passed,.tests-summary.view-shipped{color:var(--green)}.tests-summary.view-compile{color:var(--red)}.tests-body{flex:1;overflow:auto}.tests-intro{color:var(--text-2);margin:0;padding:14px 16px 4px;font-size:13.5px}.shipped-banner,.pass-banner,.fail-banner{align-items:center;gap:14px;margin:14px 16px 6px;display:flex}.shipped-banner{background:var(--green-soft);box-shadow:inset 0 0 0 1px var(--green-line);border-radius:14px;flex-wrap:wrap;padding:16px 18px}.shipped-copy{flex:1;min-width:180px}.shipped-title{letter-spacing:-.01em;font-size:17px;font-weight:650}.shipped-sub{color:var(--text-2);font-size:13.5px}.pass-banner{background:var(--green-soft);box-shadow:inset 0 0 0 1px var(--green-line);color:var(--green);border-radius:12px;padding:12px 14px;font-size:13.5px}.pass-banner span,.fail-banner{color:var(--text)}.pass-banner .muted,.fail-banner .muted,.muted{color:var(--text-2);font-weight:400}.fail-banner{background:var(--surface-2);border-radius:12px;padding:12px 14px;font-size:13.5px;line-height:1.5}.fail-segs{flex:none;gap:3px;display:flex}.seg{background:var(--border-strong);border-radius:2px;width:14px;height:7px}.seg.ok{background:var(--green)}.pop-check{background:var(--green);color:#fff;border-radius:50%;flex:none;place-items:center;width:40px;height:40px;animation:.5s cubic-bezier(.34,1.8,.5,1) pop;display:grid}.pop-check.small{width:24px;height:24px}@keyframes pop{0%{opacity:0;transform:scale(.4)}to{opacity:1;transform:scale(1)}}.compile-banner{padding:16px}.compile-head{align-items:center;gap:10px;display:flex}.compile-icon{background:var(--red-soft);width:22px;height:22px;box-shadow:inset 0 0 0 1px var(--red-line);color:var(--red);border-radius:50%;place-items:center;display:grid}.compile-title{font-size:15px;font-weight:650}.compile-head .ghost-btn{margin-left:auto}.compile-help{color:var(--text-2);margin:8px 0 0 32px;font-size:13.5px}.compile-pre{background:var(--code-bg);border:1px solid var(--border);border-radius:10px;margin:12px 0 0 32px;padding:12px 14px;font:12.5px/1.65 JetBrains Mono,ui-monospace,monospace;overflow-x:auto}.err{color:var(--red)}.test-list{padding:8px 0}.test-row{padding:9px 16px}.test-line{align-items:center;gap:10px;display:flex}.test-mark{flex:none;place-items:center;width:18px;height:18px;display:grid}.test-name{font:500 13px JetBrains Mono,ui-monospace,monospace}.test-meta{color:var(--text-3);margin-left:auto;font:12px JetBrains Mono,ui-monospace,monospace}.test-call{color:var(--text-3);margin:2px 0 0 28px;font:12px JetBrains Mono,ui-monospace,monospace}.test-msg{background:var(--surface-2);color:var(--text);white-space:pre;border-radius:8px;margin:8px 0 2px 28px;padding:9px 12px;font:12.5px/1.55 JetBrains Mono,ui-monospace,monospace;overflow-x:auto}.idle-dot{width:12px;height:12px;box-shadow:inset 0 0 0 1.5px var(--border-strong);border-radius:50%}.ok-dot,.fail-dot{border-radius:50%;place-items:center;width:18px;height:18px;display:grid}.ok-dot{background:var(--green-soft);color:var(--green)}.fail-dot{background:var(--red-soft);color:var(--red)}.spinner{border:1.5px solid var(--border-strong);border-top-color:var(--accent);border-radius:50%;width:12px;height:12px;animation:.7s linear infinite spin;display:block}@keyframes spin{to{transform:rotate(360deg)}}.br-err-line{background:#d238381a}.br-err-gutter{background:#d23838;border-radius:2px;margin-left:4px;width:3px!important}.quiz-panel{background:var(--surface);height:100%;overflow:auto}.quiz-inner{max-width:640px;margin:0 auto;padding:44px 40px 48px}.quiz-count{color:var(--text-3);align-items:center;gap:10px;font-size:13px;font-weight:500;display:flex}.quiz-steps{gap:3px;display:flex}.step{background:var(--surface-3);border-radius:3px;width:22px;height:5px}.step.current{background:var(--accent-line)}.step.filled{background:var(--accent)}.quiz-prompt{margin-top:14px}.quiz-markdown p:first-child{letter-spacing:-.015em;margin:0;font-size:21px;font-weight:650;line-height:1.35}.quiz-markdown p{margin:12px 0 0}.quiz-markdown .code-card{margin-top:16px}.select-label{color:var(--text-2);align-items:center;gap:8px;margin-top:24px;font-size:13px;font-weight:500;display:flex}.select-glyph{width:12px;height:12px;box-shadow:inset 0 0 0 1.5px var(--text-3);border-radius:50%}.select-glyph.box{border-radius:3px}.options{flex-direction:column;gap:10px;margin-top:12px;display:flex}.option{text-align:left;border:1.5px solid var(--border);background:var(--surface);cursor:pointer;width:100%;min-height:60px;color:var(--text);border-radius:12px;align-items:center;gap:14px;padding:16px 16px 16px 18px;transition:border-color .12s,background .12s,box-shadow .12s;display:flex}.option:hover{box-shadow:var(--shadow)}.option.tone-selected{border-color:var(--accent);background:var(--accent-soft)}.option.tone-wrong{border-color:var(--red-line);background:var(--red-soft)}.option.tone-wrong-kept{border-color:var(--border-strong)}.option.tone-right{border-color:var(--green-line);background:var(--green-soft)}.option.tone-dim{opacity:.55}.option-mark{width:20px;height:20px;box-shadow:inset 0 0 0 1.5px var(--border-strong);color:var(--accent-ink);border-radius:50%;flex:none;place-items:center;display:grid}.option-mark.box{border-radius:4px}.option-mark.tone-selected{box-shadow:inset 0 0 0 1.5px var(--accent);background:var(--accent)}.option-mark.tone-wrong{box-shadow:inset 0 0 0 1.5px var(--red);background:var(--red);color:#fff}.option-mark.tone-wrong-kept{box-shadow:inset 0 0 0 1.5px var(--text-3);background:var(--text-3);color:var(--surface)}.option-mark.tone-right{box-shadow:inset 0 0 0 1.5px var(--green);background:var(--green);color:#fff}.option-dot{background:currentColor;border-radius:50%;width:8px;height:8px}.option-text{flex:1;font-size:15px;line-height:1.5}.option-key{border:1px solid var(--border);width:22px;height:22px;color:var(--text-3);border-radius:6px;flex:none;place-items:center;font:500 11px JetBrains Mono,ui-monospace,monospace;display:grid}.quiz-actions{align-items:center;gap:14px;margin-top:24px;display:flex}.explain{border-radius:14px;margin-top:24px;padding:18px 20px}.explain.wrong{background:var(--surface-2);box-shadow:inset 0 0 0 1px var(--border)}.explain.right{background:var(--green-soft);box-shadow:inset 0 0 0 1px var(--green-line)}.explain-title{align-items:center;gap:10px;font-size:15px;font-weight:650;display:flex}.explain-title .blocks{margin-left:auto}.explain-spacer{flex:1}.explain p{margin:8px 0 0;font-size:14.5px;line-height:1.65}.explain .ghost-btn,.explain .accent-btn{margin-top:14px}.explain .ghost-btn{border:1px solid var(--border-strong);border-radius:9px;height:38px;padding:0 16px;font-size:13.5px;font-weight:600}.explain.wrong svg{color:var(--accent-text)}.signin{background-image:radial-gradient(var(--border) 1px, transparent 1px);background-size:22px 22px;background-color:var(--bg);place-items:center;min-height:100%;padding:32px;display:grid}.signin-card{background:var(--surface);border:1px solid var(--border);width:100%;max-width:400px;box-shadow:var(--shadow-lg);text-align:center;border-radius:18px;flex-direction:column;align-items:center;padding:40px 36px 32px;display:flex}.signin-brand{letter-spacing:-.035em;color:var(--text);align-items:center;gap:10px;font-size:23px;font-weight:700;display:flex}.signin-card h1{letter-spacing:-.02em;text-wrap:balance;margin:28px 0 0;font-size:24px;font-weight:650;line-height:1.25}.signin-sub{letter-spacing:-.02em;color:var(--text-3);margin:4px 0 0;font-size:24px;font-weight:650;line-height:1.25}.sign-blocks{gap:4px;margin:28px 0 32px;display:flex}.sign-slot{background:var(--surface-3);border-radius:3px;width:22px;height:11px;position:relative;overflow:hidden}.sign-fill{background:var(--accent);border-radius:3px;position:absolute;inset:0}.github-btn{background:var(--accent);width:100%;height:46px;color:var(--accent-ink);cursor:pointer;border:0;border-radius:11px;justify-content:center;align-items:center;gap:10px;font-size:15px;font-weight:600;display:flex;box-shadow:0 1px #00000014,inset 0 1px #ffffff59}.github-btn:hover{background:var(--accent-hover)}.fineprint{color:var(--text-3);margin:20px 0 0;font-size:12.5px}.fineprint button{color:var(--text-2);cursor:pointer;font-size:inherit;background:0 0;border:0;padding:0}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}@media (width<=980px){.top-progress{display:none}.build-card{flex-basis:100%;position:static}.lesson-article,.pager{padding-left:20px;padding-right:20px}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}