:root{--paper:#f4f6f5;--surface:#fff;--ink:#192e28;--muted:#60716a;--line:#dce2db;--green:#214d41;--green-hover:#163b31;--wash:#eaf0e9;--ochre:#946424;--danger:#a3382f;--radius:14px;--shadow:0 14px 50px #1c3d321c;--body:"PingFang SC","Microsoft YaHei",system-ui,sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.65 var(--body);accent-color:var(--green);caret-color:var(--green)}::selection{background:#cadfd0;color:#133a2c}a{color:var(--green);text-underline-offset:4px}button,input,textarea{font:inherit}button,a,input,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}:focus-visible{outline:3px solid #aa7426;outline-offset:4px}button,input,textarea{border-radius:8px}input,textarea{width:100%;border:1px solid #bcc9bf;background:#fff;padding:12px 14px;color:var(--ink)}input::placeholder,textarea::placeholder{color:#6a766f}textarea{resize:vertical;min-height:80px}input[type=file]{padding:8px;font-size:13px}input[type=file]::file-selector-button{border:0;border-radius:5px;background:var(--wash);color:var(--green);padding:7px 11px;margin-right:10px;cursor:pointer}label{display:block;font-weight:600;margin-bottom:8px}.field{margin-bottom:20px}.field small{display:block;margin-top:6px;color:var(--muted)}h1,h2,h3,p{margin:0}h1{font-size:clamp(28px,3.2vw,42px);line-height:1.3;letter-spacing:-.025em;font-weight:650;text-wrap:balance}h2{font-size:23px;line-height:1.4;font-weight:650}h3{font-size:17px;line-height:1.5}p{max-width:68ch}.muted{color:var(--muted)}.small{font-size:13px}.mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-variant-numeric:tabular-nums}.site-header{max-width:1280px;margin:auto;display:flex;align-items:center;gap:48px;padding:24px 44px;border-bottom:1px solid var(--line);min-height:90px}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-size:19px;font-weight:650;white-space:nowrap}.brand svg{width:35px;height:35px;fill:none;stroke:var(--green);stroke-width:2;stroke-linejoin:round}.site-header 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46px}.entry-form h2{margin-bottom:8px}.entry-form>p{margin-bottom:28px}.entry-form .button{margin-top:6px}.guide{background:var(--green);color:#f3f7ed;padding:40px;display:flex;flex-direction:column;justify-content:space-between;gap:30px}.guide h2{font-size:24px;max-width:12ch}.guide ol{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:25px;counter-reset:step}.guide li{display:grid;grid-template-columns:26px 1fr;gap:14px;counter-increment:step}.guide li:before{content:counter(step);font-size:13px;border:1px solid #77998a;border-radius:50%;width:26px;height:26px;display:grid;place-items:center;color:#e0eedf}.guide li strong{font-size:16px;font-weight:600;display:block}.guide li p{font-size:13px;color:#d1e2d6;margin-top:4px}.guide-foot{border-top:1px solid #557466;padding-top:20px;font-size:13px;color:#d1e2d6}.guide-foot 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strong{display:block;font-size:16px;font-weight:600;overflow-wrap:anywhere}.project-row small{display:block;color:var(--muted);margin-top:4px}.project-row .version-count{color:var(--muted);font-size:13px}.create-form{margin:0 0 24px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.form-grid .field{margin-bottom:0}.create-footer{margin-top:22px;display:flex;gap:16px;align-items:center}.detail-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:24px 0}.detail-heading h1{font-size:30px;overflow-wrap:anywhere}.detail-layout{display:grid;grid-template-columns:1fr 300px;gap:30px;align-items:start}.detail-layout .panel{padding:24px}.detail-layout .panel h2{font-size:18px;margin-bottom:20px}.settings-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.breadcrumb{color:var(--muted);font-size:14px}.qr{width:180px;height:180px;display:block;margin:20px auto}.loading{padding:70px;text-align:center;color:var(--muted)}footer{max-width:1180px;margin:auto;border-top:1px solid var(--line);padding:24px 44px;display:flex;gap:20px;justify-content:space-between;color:var(--muted);font-size:12px}.skip{position:fixed;left:10px;top:-60px;z-index:20;background:#fff;padding:12px}.skip:focus{top:10px}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:var(--green);color:#fff;padding:13px 22px;border-radius:10px;box-shadow:var(--shadow);max-width:min(92vw,600px);z-index:30}dialog{border:0;border-radius:var(--radius);padding:32px;max-width:520px;width:calc(100% - 32px);color:var(--ink);box-shadow:var(--shadow)}dialog::backdrop{background:#14281fcc}dialog h2{margin-bottom:12px}dialog p{margin:12px 0;color:var(--muted)}.secret{font-size:18px;line-height:1.7;word-break:break-all;display:block;padding:18px;background:var(--wash);border-radius:8px;margin:20px 0;color:var(--green);user-select:all}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:24px}.hidden,[hidden]{display:none!important}.mobile-status{display:none}*{scrollbar-width:thin;scrollbar-color:#a3b4a5 var(--paper)}@media(max-width:900px){.site-header{gap:25px;padding:22px 24px}main{padding:40px 24px 60px}.entry-form{padding:32px}.guide{padding:32px}.workspace{grid-template-columns:1fr 1.4fr;gap:24px}.detail-layout{grid-template-columns:1fr 270px;gap:22px}footer{padding:22px 24px}.version{align-items:flex-start;flex-direction:column;gap:12px}}@media(max-width:650px){.site-header{flex-wrap:wrap;gap:17px 24px;padding:18px 20px}.brand{font-size:17px;gap:8px}.brand svg{width:29px;height:29px}.site-header nav{order:3;width:100%;gap:28px;padding-top:3px}.site-header nav a[aria-current=page]:after{bottom:-18px}#account{font-size:12px;gap:10px}main{padding:32px 20px 45px}.intro{align-items:flex-start;flex-direction:column;gap:16px;margin-bottom:24px}.intro p{font-size:14px}.entry-layout{grid-template-columns:1fr;margin-top:22px}.entry-form{padding:28px 24px}.guide{padding:28px 24px}.guide h2{max-width:none;font-size:21px}.guide ol{gap:18px;margin-top:22px}.guide-foot{padding-top:18px}.workspace{grid-template-columns:1fr;gap:22px}.project-summary{padding-top:0}.project-summary .divider{margin:18px 0}.panel{padding:24px 20px}.section-head{margin-top:30px;align-items:flex-start}.section-head h2{font-size:21px}.version{padding:18px 0}.version-title{gap:8px}.teacher-toolbar{align-items:stretch;flex-direction:column}.search{max-width:none}.project-row{padding:19px 18px;grid-template-columns:minmax(0,1fr) 85px 16px;gap:10px}.version-count{display:none}.form-grid{grid-template-columns:1fr;gap:16px}.detail-layout{grid-template-columns:1fr}.detail-layout>aside{order:-1}.detail-heading{align-items:flex-start}.detail-heading h1{font-size:26px}.detail-heading>.actions{justify-content:flex-end}.upload-footer{align-items:flex-start;flex-direction:column}.upload-footer .button{width:100%}.file-name{max-width:100%}footer{padding:20px;flex-direction:column;gap:8px}.dialog-actions{flex-wrap:wrap}.code-input{font-size:14px}.dropzone{padding:22px 14px}.loading{padding:50px 15px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.entry-form .entry-hint{margin-top:22px;margin-bottom:0}
@media(max-width:650px){.workspace>.panel{order:-1}}

.auth-switch{display:flex;gap:10px;margin-bottom:26px}.auth-switch .button{flex:1}.field-help{margin:7px 0 0;font-size:12px}.entry-form .entry-hint{display:block;text-align:left;min-height:44px}.student-row{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}.student-row:last-child{border-bottom:0}.student-row p{margin:5px 0 0}.student-row strong{overflow-wrap:anywhere}#account .muted{max-width:180px;overflow-wrap:anywhere}@media(max-width:650px){#account .muted{max-width:110px}.student-row{align-items:flex-start;flex-wrap:wrap}}

.gallery-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,285px),1fr));gap:20px;margin:18px 0}.gallery-card{display:flex;flex-direction:column;align-items:flex-start;gap:12px;margin:0;min-width:0}.gallery-card h3{font-size:21px;overflow-wrap:anywhere}.gallery-card .actions,.gallery-card>a.button{margin-top:auto}.reference-card{background:#eef3e6}.gallery-search{display:block;font-size:14px;color:var(--muted)}.gallery-search input{display:block;margin-top:8px;width:100%}.gallery-note{margin-top:25px}.site-header nav{gap:22px}@media(max-width:650px){.site-header nav{gap:20px}.site-header nav a{font-size:14px}.gallery-card .actions{flex-wrap:wrap}.gallery-grid{grid-template-columns:1fr}}