:root{font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:#213b35;background:#f7f9f5;font-synthesis:none;font-size:15px;line-height:1.7}*{box-sizing:border-box}body{margin:0}a{color:#146c59;text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,.button{border:1px solid transparent;background:#146c59;color:#fff;border-radius:9px;padding:11px 20px;min-height:44px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:12px}button:hover,.button:hover{background:#105844;text-decoration:none}button:disabled{opacity:.5;cursor:not-allowed}.secondary{background:#fff;color:#285b4f;border-color:#cddbd3}.secondary:hover{background:#edf5ef}.small{font-size:13px;padding:7px 12px}.text-button{background:transparent;color:#146c59}.danger{background:#a83935}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #dc8a32;outline-offset:4px}header{max-width:1360px;padding:24px 48px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid #e2e8df}.brand{display:flex;align-items:center;gap:12px;color:#203e34;font-weight:750;font-size:17px}.brand:hover{text-decoration:none}.brand small{display:block;font-size:10px;letter-spacing:2px;color:#71847a;font-weight:400}.logo{background:#176b56;color:#fff;font-size:23px;border-radius:12px;display:block;padding:3px 10px;position:relative}.logo span{color:#f5c66d;font-size:19px}header nav{display:flex;gap:6px}header nav a{display:flex;align-items:center;gap:7px;padding:9px 14px;color:#60736a;font-size:14px;border-radius:8px}header nav a.active{background:#e7efe7;color:#146c59;font-weight:650}.guide-link{font-size:13px;color:#627269}main{max-width:1240px;margin:auto;padding:0 32px 60px;min-height:75vh}.hero{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;gap:40px;padding:65px 0 48px}.eyebrow{font-size:10px;letter-spacing:1.7px;font-weight:700;color:#477460}.dot{display:inline-block;width:7px;height:7px;background:#398469;border-radius:50%;margin-right:8px}h1,h2,h3,p{margin-top:0}h1{font-size:42px;line-height:1.35;letter-spacing:-1.5px;margin:18px 0 20px;font-weight:800}h2{font-size:23px;line-height:1.5}h3{font-size:18px}p{color:#5b7065}.hero p{font-size:15px;line-height:1.9}.orange{color:#d98a36}.hero-actions{display:flex;gap:24px;align-items:center;margin:28px 0 22px;font-size:13px}.hero-note{font-size:11px;color:#7c8a80}.hero-art{position:relative;padding:45px 20px 40px;background:radial-gradient(ellipse,#ddebdc 10%,transparent 70%);min-width:0}.code-window{transform:rotate(-3deg);background:#213e35;border-radius:12px;box-shadow:0 20px 30px #26493622;overflow:hidden}.window-bar{display:flex;align-items:center;gap:6px;background:#2c493f;padding:14px}.window-bar i{height:7px;width:7px;border-radius:50%;background:#f19a83}.window-bar i:nth-child(2){background:#f0cc74}.window-bar i:nth-child(3){background:#8cc89b}.window-bar span{margin-left:30px;color:#acbdb0;font:10px monospace}.window-code{font:12px/2.1 monospace;color:#e0eadd;padding:26px 24px 30px;white-space:nowrap}.comment{color:#9fbaa6}.purple{color:#c3b4e9}.yellow{color:#f4d89b}.cursor{color:#ecc16e}.float-label{position:absolute;right:8px;top:10px;font-size:12px;border:1px solid #e5e9d9;border-radius:8px;background:#fffcf0;padding:6px 14px;transform:rotate(5deg);z-index:1}.art-badge{position:absolute;bottom:20px;right:0;display:flex;align-items:center;gap:8px;background:#fff;padding:12px 20px;border-radius:9px;box-shadow:0 5px 20px #2649360d;font-size:12px;color:#3e7457}.spark{position:absolute;font-size:45px;color:#d8a657;left:0;bottom:7px}.stats{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid #e1e8df;border-radius:13px;padding:24px 0}.stats>div{padding:0 30px;border-right:1px solid #e5eae3}.stats>div:last-child{border:0}.stats span{display:block;font-size:12px;color:#6b7e70}.stats strong{font-size:29px;color:#285d47}.stats small{font-size:12px;color:#8a968b;font-weight:400}.section-heading{display:flex;align-items:end;justify-content:space-between;margin:45px 0 20px}.section-heading h2{margin:5px 0 0}.muted{font-size:12px;color:#728275}.home-grid{display:grid;grid-template-columns:1fr 270px;gap:24px}.path-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.day-card{display:block;background:#fff;border:1px solid #dfe7dd;border-radius:11px;padding:20px 22px;color:inherit;transition:transform .15s,box-shadow .15s}.day-card:hover{transform:translateY(-3px);box-shadow:0 8px 18px #26493612;text-decoration:none}.day-card.today{border-color:#61957b;background:#f0f6ed}.day-top{display:flex;justify-content:space-between;font-size:10px;color:#7d8f7d;align-items:center}.day-top b{font-size:19px;color:#316c50;margin-left:4px}.day-top>span:last-child{font-size:10px;background:#edf3e8;padding:2px 8px;border-radius:20px}.day-card h3{margin:12px 0 6px;font-size:17px}.day-card p{font-size:11px;margin-bottom:16px}.day-bottom{border-top:1px solid #e5eadf;padding-top:11px;display:flex;justify-content:space-between;font-size:11px;color:#748370}.day-bottom>span:last-child{color:#367053;font-size:16px}.today-card{background:#e9efe1;border-radius:12px;padding:26px 23px}.today-card .eyebrow{font-size:8px}.today-card h2{font-size:21px;margin:10px 0}.today-card p{font-size:12px}.today-card ol{padding-left:20px;font-size:12px;line-height:2.8;margin:20px 0}.today-card .button{width:100%;font-size:12px}.today-card .muted{margin:14px 0 0;font-size:10px}.bonus-link{display:block;background:#fcf2dd;border:1px solid #eee1c6;padding:22px;border-radius:12px;margin-top:18px;font-size:12px;color:#876438;line-height:2}.bottom-note{display:flex;align-items:center;gap:20px;background:#eef2ea;border-radius:12px;margin-top:32px;padding:25px;color:#5f8056}.bottom-note strong{font-size:13px}.bottom-note p{font-size:11px;margin:4px 0 0}.bottom-note a{margin-left:auto;font-size:11px}footer{border-top:1px solid #dfe6db;max-width:1280px;margin:auto;padding:28px 32px;display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:10px;color:#7c897e}footer .brand{font-size:12px}footer p{margin:0;font-size:10px}.page-head{padding:45px 0 20px}.page-head h1{font-size:33px}.pill{display:inline-block;background:#eaf0e5;color:#416d4c;padding:4px 12px;font-size:12px;border-radius:20px}.card{background:#fff;border:1px solid #dfe7dd;border-radius:13px;padding:28px;margin-bottom:20px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:26px}.side{height:fit-content;position:sticky;top:20px}.side p{font-size:13px}.knowledge{background:#fff;border:1px solid #dfe7dd;border-radius:12px;margin-bottom:16px}summary{cursor:pointer;font-weight:600;padding:15px 0;min-height:44px}summary:hover{color:#146c59}.knowledge>summary{padding:20px;font-size:18px}.number{display:inline-block;color:#61916c;font-size:14px;margin-right:14px}.detail-body{padding:0 26px 24px}.detail-body p{line-height:1.95}.note{background:#fff6e5;border-left:3px solid #dbb15a;padding:14px;font-size:13px}.check{background:#eef4eb;padding:0 16px;border-radius:9px}.help{border-top:1px dashed #d9e3d4;margin-top:25px;font-size:13px}.help summary{color:#507255}.tabs{display:flex;gap:10px;flex-wrap:wrap;padding-top:24px}.tabs a{padding:8px 17px;border:1px solid #d7e2d4;border-radius:8px;background:#fff}.tabs a[aria-current]{background:#146c59;color:#fff}.filters{display:flex;align-items:end;gap:14px;flex-wrap:wrap;padding:20px}.filters label{font-size:12px;color:#59705f;display:flex;flex-direction:column;gap:5px}select{padding:10px;border:1px solid #cddbd0;border-radius:7px;background:#fff;color:#334f3c;max-width:100%;min-height:44px}.question{max-width:850px;margin:0 auto}.question-top{display:flex;justify-content:space-between;align-items:center}.question h2{font-size:22px}.question progress{width:100%;height:5px;accent-color:#377e5e;margin:20px 0 10px}pre{background:#213b33;color:#e9f1e4;border-radius:10px;padding:22px;overflow-x:auto;line-height:1.85;font-size:14px;max-width:100%;-moz-tab-size:4;tab-size:4}code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}fieldset{padding:0;border:0;margin:25px 0;min-width:0}.option{display:flex;align-items:center;gap:12px;border:1px solid #dce4d8;padding:14px 17px;border-radius:9px;margin-bottom:10px;cursor:pointer;overflow-wrap:anywhere}.option.selected{border-color:#4f8b6d;background:#eff6ec}.option input{accent-color:#146c59;width:18px;height:18px;flex-shrink:0}.option-letter{font-weight:650;color:#416e50;min-width:20px}.question-nav{display:flex;justify-content:space-between;gap:10px;margin-top:30px}.feedback{padding:22px;border-radius:10px;margin-top:20px;border:1px solid #b9d9bd;background:#eff7eb}.feedback.incorrect{background:#fff4e8;border-color:#e5c6a7}.feedback h3{margin-bottom:10px}.feedback p{color:#3e5847}.timer{display:flex;align-items:center;gap:16px;margin-top:30px;flex-wrap:wrap}.timer p{margin:0}.timer output{font-size:30px;margin-left:auto;font-variant-numeric:tabular-nums}.task{max-width:900px;margin:20px auto}.task h2{margin-top:15px}.task-done{display:block;margin-top:20px}.task-done input{width:18px;height:18px;accent-color:#146c59;margin-right:10px}.prose{max-width:900px;margin:auto}.prose h2{margin-top:30px}.prose h2:first-child{margin-top:0}.prose p{line-height:1.95}.copy-status{font-size:12px;margin-left:10px}textarea{width:100%;min-height:130px;margin-top:10px}.storage-warning{background:#fff0cc;border:1px solid #d5a644;padding:18px;border-radius:8px}.skip{position:fixed;top:-100px;z-index:10;background:#fff;padding:12px}.skip:focus{top:0}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden}main,article,section{min-width:0}@media(min-width:1400px){.hero{padding-top:80px;padding-bottom:65px}}@media(max-width:1050px){header{padding:20px 25px;flex-wrap:wrap}.guide-link{display:none}header nav a{padding:8px}.hero{gap:15px}h1{font-size:35px}.home-grid{grid-template-columns:1fr 240px}.window-code{font-size:10px;padding:22px 16px}.stats>div{padding:0 20px}.lesson-layout{grid-template-columns:minmax(0,1fr) 220px}}@media(max-width:760px){header{padding:16px 20px;gap:15px}header nav{width:100%;justify-content:space-between}header nav a{font-size:12px;padding:8px;gap:5px}.brand{font-size:16px}main{padding:0 20px 35px}.hero{grid-template-columns:1fr;padding:35px 0 25px;gap:10px}.hero h1{font-size:36px}.hero-art{max-width:460px;width:100%;margin:auto;padding-top:35px}.window-code{font-size:12px}.hero-actions{gap:16px;font-size:12px}.hero-actions .button{padding:11px 14px}.stats{grid-template-columns:1fr 1fr;padding:5px 0}.stats>div{padding:14px 23px}.stats>div:nth-child(2){border-right:0}.stats strong{font-size:25px}.stats span{font-size:11px}.section-heading{margin-top:30px;align-items:start;gap:10px}.section-heading .muted{font-size:10px;max-width:90px}.home-grid{grid-template-columns:1fr}.home-grid aside{display:grid;grid-template-columns:1fr 1fr;gap:14px}.bonus-link{margin:0;height:fit-content}.today-card{padding:20px}.path-grid{gap:12px}.day-card{padding:15px}.day-card h3{font-size:15px}.day-top{gap:8px}.day-top>span:last-child{font-size:9px;padding:1px 5px}.day-card p,.day-bottom{font-size:10px}.day-bottom{gap:7px}.bottom-note{padding:20px;gap:12px;flex-wrap:wrap}.bottom-note a{margin-left:35px}footer{flex-direction:column;align-items:start;padding:23px 20px;gap:8px}.lesson-layout{grid-template-columns:1fr}.side{position:static}.page-head{padding-top:30px}.page-head h1{font-size:28px}.card{padding:20px}.knowledge>summary{font-size:16px}.detail-body{padding:0 20px 20px}.question h2{font-size:20px}pre{padding:16px;font-size:13px}.filters{gap:10px}.filters label{flex:1;min-width:110px}.filters button{font-size:12px;padding:9px 12px}.question-nav button{font-size:12px;padding:10px 14px}.timer output{font-size:26px}.timer>div{width:100%}.timer output{margin-left:0}.tabs{gap:7px}.tabs a{padding:7px 12px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}@media(max-width:480px){header nav a{white-space:nowrap;font-size:11px;padding:9px 5px;gap:4px}header nav a svg{width:14px;flex-shrink:0}.path-grid{grid-template-columns:1fr}.day-card{padding:17px 20px}.day-card h3{font-size:17px}.day-card p{font-size:12px}.day-top{font-size:11px}.day-bottom{font-size:12px}.home-grid aside{grid-template-columns:1fr}.today-card{padding:24px}.today-card h2{font-size:22px}.today-card p,.today-card ol,.bonus-link{font-size:14px}.hero-note{font-size:12px}.hero h1{font-size:34px}}
