@layer reset,base,layout,components;
@layer reset{*{box-sizing:border-box}body,h1,h2,h3,p{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}button:disabled{cursor:default;opacity:.55}svg{flex:none}img{max-width:100%}button{touch-action:manipulation}}
@layer base{
:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#263d34;background:#f6f4ed;font-size:15px;line-height:1.65;--green:#2d5a48;--muted:#6d7b72;--line:#dfe4d9;--cream:#f6f4ed;--gold:#eac97b;--shadow:0 6px 26px #243b3020}
body{min-height:100dvh}button{border:1px solid var(--line);border-radius:12px;background:#fff;color:#294638;padding:10px 17px;min-height:46px;font-weight:600}button:hover{background:#edf1e8}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #a57820;outline-offset:3px}input,textarea,select{border:1px solid #b8c6ba;border-radius:10px;padding:13px 14px;background:#fff;color:#263d34;min-height:48px;max-width:100%;font-size:16px}textarea{width:100%;resize:vertical}h1{font-size:clamp(26px,3.1vw,40px);line-height:1.35;letter-spacing:-1px}h2{font-size:23px;line-height:1.45}h3{font-size:17px}p+p{margin-top:12px}small,.muted{color:var(--muted)}strong{font-weight:650}label{display:block;font-weight:600;margin:12px 0 7px}code{font-size:13px;overflow-wrap:anywhere}table{width:100%;border-collapse:collapse;text-align:left}th,td{border-bottom:1px solid var(--line);padding:12px 8px}th{font-size:13px;color:var(--muted)}.skip-link{position:absolute;top:-100px;z-index:10;padding:10px;background:white}.skip-link:focus{top:0}progress{accent-color:var(--green);width:100%;height:8px;border:none;border-radius:20px}progress::-webkit-progress-bar{background:#e3e8df;border-radius:20px}progress::-webkit-progress-value{background:var(--green);border-radius:20px}
}
@layer layout{
.shell{display:grid;grid-template-columns:235px minmax(0,1fr);max-width:1600px;margin:auto;min-height:100dvh}.sidebar{border-right:1px solid var(--line);padding:34px 24px;display:flex;flex-direction:column;position:sticky;top:0;height:100dvh;background:#f0f2e9}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:750;font-size:21px;letter-spacing:1px}.brand img{width:37px;height:37px}.brand small{display:block;letter-spacing:2px;font-size:10px;font-weight:500}.sidebar nav{display:grid;gap:7px;margin-top:42px}.nav-item{display:flex;gap:14px;align-items:center;padding:12px 15px;border-radius:11px;color:#64766a;text-decoration:none;min-height:48px;font-weight:550}.nav-item.active{background:#dfe7d7;color:#2d5a48}.sidebar-foot{margin-top:auto;font-size:12px;padding-top:40px}.sidebar-foot .tiny-leaf{width:35px;height:2px;background:#adbda2;margin-bottom:16px}.content{padding:28px clamp(20px,4vw,66px) 50px;min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:32px;font-size:12px;color:var(--muted)}.topbar .badge{padding:5px 12px;background:#e8eddf;color:#446148;border-radius:20px;white-space:nowrap}.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin:0 0 25px}.page-head p{margin-top:7px;color:var(--muted)}.eyebrow{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:#687d5c;font-weight:700;margin-bottom:9px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.two-col{display:grid;grid-template-columns:1.4fr 1fr;gap:20px}.stack{display:grid;gap:20px}.mobile-nav{display:none}.page-footer{margin-top:36px;border-top:1px solid var(--line);padding-top:18px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;align-items:center;font-size:12px}.boot{padding:80px 30px;text-align:center}.narrow{max-width:720px;margin:0 auto}.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:22px}.actions .primary{flex:1}.spaced{margin-top:24px}.section-title{display:flex;justify-content:space-between;align-items:center;margin:29px 0 15px;gap:15px}.table-wrap{overflow-x:auto}
@media(min-width:1450px){.content{padding-top:34px}.hero{min-height:270px}}
@media(max-width:1100px){.shell{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding:28px 15px}.content{padding:25px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-art{width:160px!important}.two-col{grid-template-columns:1fr}.brand{font-size:19px}}
@media(max-width:720px){.shell{display:block}.sidebar{display:none}.content{padding:18px 18px calc(100px + env(safe-area-inset-bottom))}.topbar{margin-bottom:27px}.topbar:before{content:'小步英语';font-size:17px;font-weight:750;color:var(--green)}.topbar .crumb{display:none}.page-head{align-items:flex-start;flex-direction:column;gap:14px}.page-head h1{font-size:29px}.mobile-nav{display:flex;justify-content:space-around;position:fixed;bottom:0;left:0;right:0;background:#f7f8f1f5;backdrop-filter:blur(12px);border-top:1px solid #dfe4d9;padding:8px 5px calc(8px + env(safe-area-inset-bottom));z-index:5}.mobile-nav a{display:grid;justify-items:center;gap:2px;min-width:58px;min-height:46px;font-size:10px;text-decoration:none;color:#738173;padding:3px 8px}.mobile-nav a.active{color:#234f3b;font-weight:750}.grid{gap:11px}.hero{padding:25px!important;min-height:240px}.hero-art{width:105px!important;opacity:.7;position:absolute;right:15px;bottom:14px;pointer-events:none}.hero h2{font-size:32px!important}.hero .primary{position:relative;z-index:1}.stat-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.stat .value{font-size:23px}.stat{padding:16px 10px!important}.module-card{padding:17px!important}.page-footer{align-items:flex-start}.lesson-word{font-size:52px!important}.question{padding:23px!important}.option{padding:13px!important}.onboarding{padding:25px!important}.settings-code{font-size:14px!important}.quick-stats{gap:11px!important}.question .actions{position:sticky;bottom:calc(80px + env(safe-area-inset-bottom));background:#fff;padding:10px 0 0}.word-head{align-items:flex-start!important}.module-card h3{font-size:15px}.unit-strip{align-items:flex-start!important;gap:10px!important}.unit-strip .muted{font-size:12px}.hero p{max-width:220px!important}.hero .eyebrow{max-width:200px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
}
@layer components{
.primary{background:var(--green);border-color:var(--green);color:white}.primary:hover{background:#204936;color:white}.secondary{background:#eaf0e3;border-color:#dfe8d5}.text-button{background:transparent;border:none;padding:8px;color:#4e6954;text-decoration:underline;text-underline-offset:4px;font-weight:500}.subtle{background:transparent;border:1px solid #cbd6c7}.icon-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 14px}.icon{width:21px;height:21px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.hero{display:flex;align-items:center;justify-content:space-between;gap:16px;background:#e3ebda;border:1px solid #d4dec9;border-radius:22px;padding:34px 37px;position:relative;overflow:hidden}.hero h2{font-size:42px;font-family:Georgia,"Times New Roman",serif;font-weight:400;letter-spacing:-1px;margin:5px 0 10px}.hero p{color:#5f7158;font-size:14px;max-width:400px}.hero .primary{margin-top:24px;padding:13px 23px;border-radius:12px;display:inline-flex;gap:20px;align-items:center}.hero-art{width:205px;height:185px;flex:none;color:#2d5a48}.unit-strip{padding:15px 0;display:flex;align-items:center;gap:18px;border-bottom:1px solid var(--line);font-size:13px}.pill{display:inline-flex;align-items:center;padding:4px 10px;border-radius:6px;font-size:11px;font-weight:650;background:#e8eddf;color:#476145;white-space:nowrap}.pill.gold{background:#f3e6bf;color:#795b20}.mode-switch{display:flex;background:#e9ece2;border-radius:12px;padding:4px;gap:4px}.mode-switch button{min-height:44px;padding:6px 16px;border:0;background:none;border-radius:9px;color:#788270;font-size:12px}.mode-switch button.selected{background:white;box-shadow:0 2px 6px #20382012;color:#2d5a48}.module-card{position:relative;border:1px solid var(--line);border-radius:16px;padding:22px;background:#fffefa;text-align:left;min-height:170px;transition:transform .15s ease}.module-card:hover{transform:translateY(-2px);background:#fff}.module-card .module-icon{width:39px;height:39px;border-radius:12px;background:#edf0e5;display:grid;place-items:center;margin-bottom:18px;color:#5c7351}.module-card:nth-child(3n+2) .module-icon{background:#f3e8cc;color:#8c7131}.module-card:nth-child(3n) .module-icon{background:#e8ecee;color:#657986}.module-card .meta{display:flex;justify-content:space-between;gap:5px;font-weight:400;font-size:11px;color:#7d8677;margin-top:8px}.module-card .done{position:absolute;right:17px;top:20px;color:#3b704e}.module-card p{font-size:12px;color:#76816e;font-weight:400;margin-top:5px}.callout{border:1px solid #dce5d5;background:#edf1e5;border-radius:13px;padding:18px 21px;font-size:13px}.callout.warning{background:#fcf1d7;border-color:#edddb1;color:#745b27}.callout p{color:inherit}.stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.stat{border:1px solid var(--line);border-radius:15px;background:#fffefa;padding:22px}.stat .value{display:block;font-size:32px;font-weight:600;color:#355a43}.stat .label{font-size:12px;color:var(--muted)}.card{border:1px solid var(--line);border-radius:17px;background:#fffefa;padding:25px}.question{padding:32px;border:1px solid var(--line);border-radius:20px;background:#fffefa}.question h2{font-size:23px;margin:22px 0 20px;line-height:1.6}.question-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;color:var(--muted);font-size:12px}.options{display:grid;gap:12px;margin-top:22px}.option{text-align:left;padding:16px 19px;font-weight:500;display:flex;gap:16px;align-items:center;border-radius:12px}.option .letter{font-size:11px;background:#f0f2eb;border-radius:6px;min-width:25px;text-align:center;padding:2px}.option.correct{border-color:#458259;background:#edf5e9}.option.wrong{border-color:#b46c4d;background:#fcf0e7}.answer-input{width:100%;font-size:22px!important;letter-spacing:.04em;margin-top:12px;scroll-margin-bottom:180px}.spell-preview{display:flex;gap:7px;margin:17px 0;flex-wrap:wrap}.spell-preview span{width:34px;height:42px;border-bottom:2px solid #a5b797;text-align:center;font-size:24px;color:#2d5a48}.feedback-box{margin-top:23px;background:#edf2e6;border-radius:12px;padding:17px}.feedback-box.wrong{background:#faf0de;color:#745b27}.feedback-box h3{margin-bottom:5px}.reading{font-family:Georgia,"Times New Roman",serif;font-size:24px;line-height:1.9;background:#f0f2e8;padding:22px;border-radius:12px;margin:18px 0}.word-head{display:flex;justify-content:space-between;align-items:center;gap:14px}.lesson-word{font-family:Georgia,"Times New Roman",serif;font-size:65px;line-height:1.3;margin:15px 0 4px;font-weight:400;letter-spacing:-1px}.ipa{color:#718367;font-size:17px}.meaning{font-size:21px;margin:22px 0}.example{border-left:2px solid #c7d6bd;padding:8px 0 8px 18px;margin:15px 0;font-size:18px}.example small{display:block;font-family:inherit;font-size:13px}.tokens{display:flex;gap:9px;flex-wrap:wrap;padding:13px 0}.token-target{min-height:64px;border-bottom:2px solid #bccab4;margin-bottom:15px}.reading-translation{font-size:13px;font-family:inherit}.recorder-controls{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.recording-dot{width:9px;height:9px;display:inline-block;border-radius:50%;background:#b94c40;margin-right:7px}.audio-row{padding:15px 0;border-bottom:1px solid var(--line)}audio{width:100%;max-width:500px;margin-top:9px}.onboarding{max-width:700px;margin:30px auto;padding:38px;background:#fffefa;border:1px solid var(--line);border-radius:20px}.onboarding h1{font-size:31px}.onboarding ol{padding-left:22px}.onboarding li{margin:10px 0}.keyboard-guide{display:flex;align-items:center;gap:15px;flex-wrap:wrap;background:#eef0e7;padding:16px;border-radius:12px;margin:17px 0}.keyboard-guide svg{width:112px;max-height:150px}.settings-code{font-family:ui-monospace,monospace;font-size:18px;letter-spacing:.04em;overflow-wrap:anywhere;display:block;background:#edf0e6;padding:18px;border-radius:10px;margin-top:10px}.status-dot{display:inline-block;width:6px;height:6px;background:#719365;border-radius:50%;margin-right:5px}.empty{text-align:center;padding:45px 20px}.empty .icon{width:35px;height:35px;margin:0 auto 15px}.note{font-size:12px;color:#71806b}.error{color:#9d4631}.row{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:14px 0;border-bottom:1px solid var(--line)}.row:last-child{border-bottom:0}.quick-stats{display:flex;gap:27px;margin-top:20px;font-size:12px;color:#78816e}.quick-stats strong{color:#3c5b43;font-size:17px;margin-right:5px}.link-list{display:grid;gap:8px}.link-list a{padding:12px 0}#toast{position:fixed;bottom:calc(97px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);background:#243e33;color:white;border-radius:13px;padding:12px 20px;z-index:30;box-shadow:var(--shadow);max-width:min(90vw,650px);font-size:13px;display:none}#toast.visible{display:block}dialog{border:1px solid var(--line);border-radius:18px;max-width:540px;width:calc(100% - 32px);padding:28px;color:#263d34}dialog::backdrop{background:#1f382c66}dialog p{margin:12px 0;font-size:13px}.success-ring{width:74px;height:74px;border:2px solid #9cb68d;border-radius:50%;display:grid;place-items:center;margin:10px auto 23px;background:#edf3e5}.success-ring svg{width:32px;height:32px}.privacy{font-size:13px}.privacy ul{padding-left:20px}.badge-number{font-family:Georgia,serif;font-size:19px}.file-input{display:none}.field-row{display:flex;gap:10px;align-items:center}.field-row input{min-width:0;flex:1}.feedback-review{font-size:13px;padding:12px 0;border-bottom:1px solid var(--line)}
}

@layer components { summary{min-height:44px;padding:9px 0;cursor:pointer}.page-footer a,.note a,.onboarding .actions a{display:inline-flex;align-items:center;min-height:44px} }