/* Genesis: neutral editorial surfaces, indigo interactions, semantic status. */
@import url("fonts/fonts.9e188156a53f.css");
:root{color-scheme:light;--ink:#0a0a0a;--muted:#6b6b6b;--primary:#6366f1;--primary-hover:#4f46e5;--green:var(--primary);--paper:#fafafa;--white:#fff;--line:#e8e8ec;--pale:#f3f3f5;--blue:#f3f3f5;--surface:#fff;--success:#10b981;--warning:#f59e0b;--error:#ef4444;--error-bg:#fff1f2;--error-text:#b42332;--success-bg:#ecfdf5;--success-text:#087957;--warning-bg:#fffbeb;--warning-text:#946000;--body:'DM Sans',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;--heading:'General Sans',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;--mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Consolas,monospace}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.75 var(--body)}a{color:var(--primary-hover);text-decoration:none}a:hover{text-decoration:underline}button,input,textarea,select{font:inherit}button,a,input,textarea,select,summary{touch-action:manipulation}button{cursor:pointer}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:var(--heading);font-weight:700;letter-spacing:-.03em}h1{font-size:clamp(32px,4vw,60px);line-height:1.2;margin-bottom:16px}h2{font-size:24px;line-height:1.5;margin-bottom:16px}h3{font-size:20px}strong,b{font-weight:700}pre,code{font-family:var(--mono)}code{background:var(--pale);padding:2px 4px;border-radius:4px}pre{overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--pale);padding:20px;border-radius:8px;font-size:14px;line-height:1.75}pre code{padding:0;background:none}
.topbar{position:sticky;top:0;z-index:10;min-height:56px;display:flex;align-items:center;justify-content:space-between;padding:8px max(24px,calc((100vw - 1232px)/2));background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;gap:12px;align-items:center;font-family:var(--heading);font-weight:700;white-space:nowrap;color:var(--ink);line-height:1.4}.brand:hover{text-decoration:none}.brand-mark{border:1px solid var(--line);color:var(--ink);width:36px;height:36px;display:grid;place-items:center;font:700 24px var(--heading);border-radius:8px;background:var(--pale)}.brand small{display:block;color:var(--muted);font:11px var(--body);letter-spacing:1px;margin-top:4px}nav{display:flex;gap:8px;align-items:center;font-size:14px}nav>a,.link-button{padding:8px 12px;border-radius:6px;color:var(--muted)}nav>a:hover,.link-button:hover{background:var(--pale);text-decoration:none;color:var(--primary-hover)}nav>a[aria-current=page]{color:var(--primary-hover);background:var(--pale)}nav form{margin:0}.identity{font-size:12px;color:var(--muted);border-left:1px solid var(--line);padding-left:16px;margin-left:8px}.link-button{border:0;background:none;font-size:inherit}.nav-toggle{display:none}
main{max-width:1280px;margin:0 auto;padding:64px 24px 80px;min-height:calc(100vh - 144px)}footer{border-top:1px solid var(--line);max-width:1232px;margin:auto;padding:24px 0;font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:16px}.eyebrow{font-size:11px;font-weight:500;letter-spacing:2px;text-transform:uppercase;color:var(--muted);margin-bottom:16px}.muted,.hint{color:var(--muted)}.hint{font-size:12px;margin-top:16px}.page-head{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:48px}.page-head p:last-child{margin-bottom:0}.page-head>div{min-width:0}
.button{border:1px solid var(--primary);background:var(--primary);color:#fff;padding:8px 20px;min-height:44px;border-radius:6px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:500;white-space:nowrap;transition:transform .2s,box-shadow .2s,background .2s}.button:hover{background:var(--primary-hover);border-color:var(--primary-hover);color:#fff;text-decoration:none;transform:translateY(-1px);box-shadow:0 4px 12px #6366f159}.secondary{background:transparent;color:var(--ink);border-color:var(--line)}.secondary:hover{background:var(--pale);color:var(--ink);border-color:var(--line);box-shadow:none}.button:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.full{width:100%;margin-top:24px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:32px;margin-bottom:24px}.section-label{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:13px}.task-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.task-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:32px;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}.task-card:hover{transform:translateY(-2px);box-shadow:0 8px 30px #00000014}.card-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;margin-bottom:32px}.tag,.status-chip{display:inline-block;background:var(--pale);color:var(--muted);font-size:12px;padding:4px 12px;border-radius:9999px;white-space:nowrap}.tag.blue{background:var(--pale);color:var(--muted)}.status-published{background:var(--success-bg);color:var(--success-text)}.status-draft{background:var(--warning-bg);color:var(--warning-text)}.task-card h2{margin-bottom:8px;min-height:72px}.task-card h2 a{color:var(--ink)}.task-card h2 a:hover{color:var(--primary-hover)}.deadline{margin:16px 0 24px;display:flex;flex-direction:column}.deadline small{font-size:12px;color:var(--muted)}.deadline strong{font-size:24px;font-weight:500;letter-spacing:-.03em}.card-bottom{border-top:1px solid var(--line);padding-top:20px;display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:13px;margin-top:auto}
.login-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:96px;align-items:center;min-height:640px}.login-intro h1{font-size:clamp(44px,5.4vw,72px);line-height:1.25;letter-spacing:-.04em;margin:24px 0 32px}.login-intro em{font-style:normal;color:var(--ink)}.login-intro>p:not(.eyebrow){font-size:15px;color:var(--muted)}.course-line{display:flex;gap:24px;padding-top:32px;margin-top:40px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.login-panel{padding:40px;margin-bottom:0}.login-panel h2{font-size:32px;letter-spacing:-.03em}
label{display:block;font-size:13px;font-weight:500;margin:16px 0 8px}input:not([type=checkbox]):not([type=hidden]),select,textarea{width:100%;padding:10px 14px;border:1px solid var(--line);background:var(--surface);border-radius:6px;color:var(--ink);min-height:44px;font-size:14px}input::placeholder,textarea::placeholder{color:#9c9c9c}input[type=file]{padding:8px!important;font-size:13px;max-width:100%}input::file-selector-button{border:1px solid var(--line);border-radius:4px;background:var(--pale);color:var(--ink);padding:4px 12px;margin-right:12px}textarea{resize:vertical}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f11f}:where(a,button,summary):focus-visible{outline:3px solid #6366f180;outline-offset:3px}input[aria-invalid=true],textarea[aria-invalid=true]{border-color:var(--error)}.check{display:flex;align-items:center;gap:8px;font-weight:400}input[type=checkbox]{width:20px;height:20px;accent-color:var(--primary);flex-shrink:0}.helptext{font-size:12px;color:var(--muted)}.errorlist{list-style:none;padding:12px 16px;background:var(--error-bg);color:var(--error-text);border-radius:6px;font-size:14px;overflow-wrap:anywhere}.message{padding:16px 20px;border:1px solid var(--success);background:var(--success-bg);color:var(--success-text);border-radius:8px;margin-bottom:24px;font-size:14px}.message.error{background:var(--error-bg);border-color:var(--error);color:var(--error-text)}.message.warning{background:var(--warning-bg);border-color:var(--warning);color:var(--warning-text)}
.back{display:inline-block;font-size:13px;margin-bottom:24px}.action-bar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:24px}.action-bar form{margin:0}.prose{overflow-wrap:anywhere}.prose h1{font-size:32px}.prose h2{font-size:24px}.prose table{margin:24px 0}.prose p:last-child{margin-bottom:0}.prose ul,.prose ol{padding-left:24px}.question{position:relative;padding-left:80px}.question-number{position:absolute;left:32px;top:32px;color:var(--muted);font:500 20px var(--mono)}.internal{background:var(--pale)}.internal summary{font-size:14px;color:var(--muted);cursor:pointer}.internal .prose{padding-top:20px}.table-scroll{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}th,td{padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}th{font-weight:500;background:var(--pale)}tbody tr:hover{background:var(--pale)}td input{min-width:80px}table p{margin:4px 0}.file-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;background:var(--pale);padding:12px 16px;border-radius:6px;margin-top:12px;font-size:13px}.file-row a{overflow-wrap:anywhere;min-width:0}.file-row label{margin:0 0 0 auto}.incomplete{margin-top:24px;padding-top:16px;border-top:1px dashed var(--line);font-size:13px;color:var(--muted)}summary{cursor:pointer}.sticky-actions{position:sticky;bottom:12px;display:flex;justify-content:flex-end;align-items:center;gap:12px;background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(16px);border:1px solid var(--line);border-radius:8px;padding:16px 24px;margin:24px 0;z-index:2}.sticky-actions span{margin-right:auto;font-size:12px}.code-input,.answer-text,.source-code{font-family:var(--mono)}.review-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(230px,1fr);gap:32px}.review-grid>div{min-width:0}.review-note{border-left:1px solid var(--line);padding-left:24px}.review-note label{margin-top:0}.feedback{border-top:3px solid var(--success)}.feedback-entry+.feedback-entry{border-top:1px solid var(--line);margin-top:24px;padding-top:24px}.narrow{max-width:600px;margin:32px auto}.empty{grid-column:1/-1;text-align:center;padding:64px 24px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.revision-summary,.revision-notice{background:var(--error-bg);border:1px solid var(--error);border-left-width:4px;border-radius:8px;padding:24px;margin:0 0 32px;color:var(--error-text);overflow-wrap:anywhere}.revision-summary strong,.revision-label{font-size:18px;font-weight:700;color:var(--error-text)}.revision-summary p{margin-bottom:0}.revision-notice h2{margin-top:8px}.revision-reason{white-space:normal}.revision-notice .action-bar{margin-bottom:0}.task-card-returned{border:2px solid var(--error)}.revision-card{border-top:1px solid var(--error);padding-top:20px;margin-top:16px;overflow-wrap:anywhere}.revision-notice a:not(.button),.revision-card a:not(.button){color:var(--error-text);text-decoration:underline}.filter-bar,.viewer-toolbar,.review-navigation{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:24px 0}.filter-bar a{padding:8px 16px;border:1px solid var(--line);border-radius:6px}.filter-bar a[aria-current]{background:var(--primary);color:#fff}.review-navigation small{color:var(--muted)}.inline-preview{margin-top:12px}.inline-preview summary{padding:12px 16px;background:var(--pale);border-radius:6px}.inline-preview iframe{width:100%;height:480px;border:1px solid var(--line);background:var(--surface)}.viewer-toolbar button{padding:8px 16px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:6px}.code-view{background:#18181b;color:#e4e4e7;overflow:auto;max-height:75vh;border-radius:8px;padding:16px 12px;font:14px/1.75 var(--mono)}.code-view ol{margin:0;padding-left:4em}.code-view li{padding-left:12px;white-space:pre}.code-view li::marker{color:#9c9c9c}.code-view code{background:transparent;color:inherit;padding:0;font:inherit}.wrap-code li{white-space:pre-wrap;overflow-wrap:anywhere}.image-stage{overflow:auto;background:var(--pale);max-height:75vh;padding:12px;border-radius:8px}.image-stage img{display:block;width:100%;max-width:none;height:auto}body:has(.embedded-viewer)>.topbar,body:has(.embedded-viewer)>footer{display:none}body:has(.embedded-viewer) main{padding:12px;max-width:none}.embedded-viewer h1{font-size:20px}.embedded-viewer .page-head{margin-bottom:12px}.embedded-viewer .code-view,.embedded-viewer .image-stage{max-height:320px}
@media(max-width:900px){.topbar{padding:8px 24px;flex-wrap:wrap;gap:8px}.nav-toggle{display:block;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);padding:8px 12px;min-height:40px}nav{width:100%;flex-wrap:wrap;padding:12px 0;border-top:1px solid var(--line)}.js #main-nav:not(.is-open){display:none}.identity{border:0;padding:0;margin:0}main{padding:40px 24px 64px}.login-layout{gap:40px;grid-template-columns:1fr;min-height:auto}.login-intro h1{font-size:48px}.login-intro{padding:8px 0}.login-panel{padding:32px;max-width:600px;width:100%}.course-line{margin-top:24px;padding-top:24px}.page-head{align-items:flex-start;flex-direction:column;margin-bottom:32px}.review-grid{grid-template-columns:1fr}.review-note{border-left:0;border-top:1px solid var(--line);padding:24px 0 0}footer{margin:0 24px;flex-wrap:wrap}}
@media(max-width:600px){main{padding:32px 16px 48px}.topbar{padding:8px 16px}.topbar>.muted{font-size:11px}.brand{font-size:14px}.task-grid{grid-template-columns:1fr}.task-card,.panel{padding:24px}.task-card h2{min-height:0;font-size:22px}.question{padding-left:48px}.question-number{left:16px;top:24px;font-size:16px}.sticky-actions{flex-wrap:wrap;padding:12px;bottom:4px}.sticky-actions span{width:100%}.sticky-actions .button{flex:1;padding:8px}.course-line{gap:16px;flex-wrap:wrap}.login-intro h1{font-size:44px}.login-panel h2{font-size:28px}.prose table{display:block;overflow:auto}th,td{padding:12px 8px}.revision-notice,.revision-summary{padding:16px}.revision-button{white-space:normal;text-align:center;max-width:100%}.card-bottom{flex-wrap:wrap}footer{margin:0 16px}.page-head h1{overflow-wrap:anywhere}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}.button:hover,.task-card:hover{transform:none}}

.button.danger{background:transparent;color:var(--error-text);border-color:var(--error)}.button.danger:hover{background:var(--error-bg);color:var(--error-text);box-shadow:none;border-color:var(--error)}