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img{width:58px;height:58px}}.optional-note{font-size:14px;line-height:1.8;background:#f0eee1;border-radius:10px;padding:14px;color:#4f5740}.bridge-lesson{border:1px solid #b6cbb3;border-radius:12px;padding:16px;margin:18px 0;background:#f4f8ee;font-size:14px;line-height:1.9}.bridge-lesson summary{cursor:pointer;font-weight:700;color:#28523a}.bridge-lesson pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#e8eee0;padding:14px;border-radius:8px;font-size:13px}.map-plain-goal{font-size:14px;color:#425b47;line-height:1.8;margin:0 24px 16px}.rest-page h1{text-wrap:balance}.study-small-step{font-size:15px;line-height:1.9;border-left:3px solid #69865b;padding:12px 18px;background:#f1f5e9}.editor-tip{font-size:12px;padding:10px 16px;margin:0;color:#d0decf;background:#243c30;line-height:1.7}.learning-flow.workspace{max-width:808px;margin:0 auto;padding:24px 24px 64px}.lesson-topline{display:flex;align-items:center;justify-content:space-between;gap:16px;color:#526656;font-size:12px;margin-bottom:25px}.lesson-topline button{font-size:12px;min-height:36px}.lesson-progress{display:flex;list-style:none;padding:0;margin:0 0 25px;gap:24px;color:#657063;font-size:12px}.lesson-progress li{display:flex;align-items:center;gap:7px;min-width:0}.lesson-progress li>span{display:grid;place-items:center;border:1px solid #abb9a5;border-radius:50%;width:24px;height:24px;flex:none;font-size:11px}.lesson-progress [aria-current=step]{color:#173e30;font-weight:700}.lesson-progress [aria-current=step]>span{background:#214b36;color:#fff;border-color:#214b36}.learning-flow h1{font-size:clamp(25px,4vw,34px);line-height:1.45;letter-spacing:-.6px;margin:0 0 24px}.lesson-intro{background:#fffef9;border:1px solid #dce3d5;border-radius:18px;padding:28px 32px 32px}.lesson-guide{display:flex;align-items:center;gap:12px;margin-bottom:20px}.lesson-guide 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12px;color:#24472f}.lesson-answer h3:focus{outline:none}.lesson-answer .solution pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.8 ui-monospace,monospace;margin:12px 0;background:#e7efdd}.lesson-answer .solution p{font-size:14px;line-height:1.85;margin:10px 0;overflow-wrap:anywhere}.lesson-answer .solution .lesson-answer-note{margin-top:0;color:#425b3b}.lesson-answer .outline-button{min-height:44px;font-size:13px;white-space:normal}.learning-flow .coding-panel{border-radius:12px;overflow:hidden;border:1px solid #b7c7b4}.learning-flow .editor-toolbar{padding:12px 18px}.learning-flow .editor-toolbar>span{font-size:13px;letter-spacing:0}.learning-flow .editor-toolbar small{font-size:10px;letter-spacing:0}.lesson-main-action{margin:18px 0 22px;text-align:center}.lesson-main-action>p{font-size:12px;line-height:1.7;color:#53634c;margin:10px 0 0}.lesson-rest{font-size:13px;margin-top:12px;padding:10px}.lesson-feedback{margin:16px 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40px}.lesson-topline{font-size:10px;gap:8px;margin-bottom:16px}.lesson-topline button{font-size:11px}.lesson-progress{gap:12px;font-size:10px;margin-bottom:20px;justify-content:space-between}.lesson-progress li{gap:4px}.lesson-progress li>span{width:20px;height:20px;font-size:10px}.learning-flow h1{margin-bottom:19px}.lesson-intro{padding:20px 18px;border-radius:12px}.lesson-guide{gap:9px;margin-bottom:16px}.lesson-guide img{width:44px;height:44px}.lesson-guide p{font-size:12px}.lesson-goal-text{font-size:16px}.lesson-example{flex-direction:column;align-items:stretch;gap:9px;padding:16px;margin:20px 0}.lesson-example pre{font-size:16px}.example-arrow{align-self:center;transform:rotate(90deg);font-size:18px;line-height:1}.lesson-primary.button,.lesson-primary.outline-button{font-size:14px;padding:13px 10px}.learning-flow h2{font-size:18px}.lesson-write-instruction>p{font-size:14px}.learning-flow .editor-toolbar{padding:11px 13px}.learning-flow .console{padding:17px}.learning-flow 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components;@layer utilities{.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.block{display:block}.contents{display:contents}.hidden{display:none}.table{display:table}.py-100{padding-block:calc(var(--spacing) * 100)}.py-101{padding-block:calc(var(--spacing) * 101)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{color:#1b3029;font-synthesis:none;--green:#193c2e;--lime:#d5f175;--muted:#748078;--line:#dfe5db;background:#fafbf5;font-family:Arial,Hiragino Kaku Gothic ProN,Noto Sans 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48px;display:flex}.brand{text-align:left;letter-spacing:-1px;white-space:nowrap;align-items:center;gap:10px;padding:0;font-size:24px;font-weight:800;line-height:1.2;display:flex}.brand-light{font-weight:400}.brand small{letter-spacing:2px;margin-top:7px;font-size:7px;font-weight:600;display:block}.brand-symbol{flex:none;width:43px;height:43px;display:block;overflow:visible}.brand-light{margin-left:3px}.footer-brand .brand-symbol{width:30px;height:30px}.header nav{gap:33px;margin-left:auto;display:flex}.header nav button{color:#637269;white-space:nowrap;padding:11px 0;font-size:12px;font-weight:600}.header nav button.active{color:var(--green);box-shadow:0 2px var(--green)}.header-start{background:var(--green);color:#fff;white-space:nowrap;border-radius:6px;gap:23px;padding:12px 19px;font-size:12px;display:flex}.header-start span{color:var(--lime)}.hero{grid-template-columns:1fr 1fr;align-items:center;gap:12px;max-width:1280px;min-height:614px;margin:auto;padding:50px 48px 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