* { box-sizing: border-box; }
[hidden] { display: none !important; }
:root { font-family: "Microsoft YaHei",system-ui,sans-serif; color:#1b2d48; background:#f3f6fa; font-size:15px; line-height:1.65; --blue:#2563eb; --line:#dde5ef; --muted:#697a90; }
body { margin:0; }
header { height:76px; background:white; border-bottom:1px solid var(--line); padding:0 36px; display:flex; align-items:center; justify-content:space-between; }
.brand { text-decoration:none; font-size:28px; font-weight:700; color:var(--blue); }
.brand span { font-size:20px; color:#1b2d48; margin-left:18px; }
#account { display:flex; align-items:center; gap:16px; }
main { max-width:1600px; margin:0 auto; padding:32px; }
h1 { font-size:28px; margin:0 0 8px; }
h2 { font-size:20px; margin:0 0 20px; }
h3 { font-size:17px; }
p { margin:8px 0 16px; }
.muted { color:var(--muted); }
.eyebrow { color:var(--blue); font-size:13px; letter-spacing:2px; margin-bottom:8px; }
.page-head { display:flex; justify-content:space-between; align-items:center; gap:20px; margin-bottom:26px; }
.actions { display:flex; flex-wrap:wrap; gap:10px; align-items:center; }
button,.button { font:inherit; border:1px solid transparent; border-radius:7px; padding:10px 18px; background:var(--blue); color:white; cursor:pointer; text-decoration:none; display:inline-block; text-align:center; }
button:disabled { opacity:.5; cursor:wait; }
.secondary { background:white; border-color:var(--line); color:#29415e; }
.text-button { background:transparent; color:var(--blue); padding:6px; border:0; }
.danger { color:#a53b38; }
.card { background:white; border:1px solid var(--line); border-radius:12px; padding:26px; margin-bottom:20px; min-width:0; }
.auth { max-width:440px; margin:70px auto; }
label { display:block; font-size:14px; margin-bottom:8px; }
input,select,textarea { font:inherit; border:1px solid var(--line); border-radius:6px; padding:11px 12px; background:#fcfdff; color:inherit; width:100%; min-width:0; }
input:focus,select:focus,textarea:focus { outline:2px solid #a9c7ff; border-color:var(--blue); }
textarea { resize:vertical; min-height:100px; }
.field { margin-bottom:20px; }
.grid2 { display:grid; grid-template-columns:1fr 1fr; gap:22px; }
.layout { display:grid; grid-template-columns:154px minmax(0,1fr); gap:24px; }
.nav { display:flex; flex-direction:column; gap:10px; }
.nav button { color:var(--muted); text-align:left; background:transparent; }
.nav button.active { background:#e6efff; color:var(--blue); }
.task-row { padding:20px; border:1px solid var(--line); border-radius:9px; display:flex; align-items:center; justify-content:space-between; gap:20px; margin:12px 0; }
.task-row strong { font-size:18px; }
.tag { font-size:12px; border-radius:5px; background:#eef3fa; padding:4px 9px; color:#5c718d; }
.tag.good { background:#e7f6ed; color:#18734c; }
.tag.wait { background:#fff4dc; color:#93601a; }
.tag.fail { background:#fdeceb; color:#a43c38; }
.rule-row { display:grid; grid-template-columns:130px 90px 1fr 58px; gap:12px; align-items:start; border-bottom:1px solid #edf1f6; padding:12px 0; }
.rule-row textarea { min-height:48px; height:48px; }
.total { color:#18734c; }
.total.invalid { color:#b03e3e; }
.upload-area { border:2px dashed #c8d7ed; border-radius:10px; padding:20px; text-align:center; background:#f8fbff; margin:16px 0; }
.upload-area:focus-within { border-color:var(--blue); }
.upload-area input { margin:14px 0; font-size:13px; }
.upload-preview { max-width:100%; max-height:340px; object-fit:contain; display:block; margin:14px auto; }
.student-list { max-height:200px; overflow:auto; border:1px solid var(--line); border-radius:6px; margin-top:8px; }
.student-list button { display:block; width:100%; text-align:left; background:white; color:#29415e; border-radius:0; border-bottom:1px solid #edf1f6; padding:8px 12px; }
.student-list button.selected { background:#eaf1ff; color:var(--blue); }
.work-grid { display:grid; grid-template-columns:300px minmax(0,1fr); gap:22px; align-items:start; }
.submissions { max-height:560px; overflow:auto; }
.submission { padding:14px; margin-bottom:9px; border:1px solid var(--line); border-radius:8px; display:flex; justify-content:space-between; align-items:center; gap:10px; }
.submission.selected { border-color:#8bb1ff; background:#f4f8ff; }
.review-grid { display:grid; grid-template-columns:minmax(0,1.2fr) minmax(0,1fr); gap:24px; }
.original { overflow:auto; max-height:760px; background:#edf1f5; border:1px solid var(--line); border-radius:8px; text-align:center; min-height:250px; }
.original img { width:100%; transform-origin:center center; display:block; }
.score { font-size:34px; color:var(--blue); font-weight:700; }
.score-row { display:grid; grid-template-columns:1fr 90px 50px; gap:10px; align-items:center; padding:10px 0; border-bottom:1px solid #edf1f6; }
.score-row input { padding:6px 10px; }
.score-comment { font-size:13px; color:var(--muted); margin:0; }
.sticky-actions { position:sticky; bottom:0; background:white; padding:16px 0 0; display:flex; flex-wrap:wrap; gap:10px; border-top:1px solid var(--line); margin-top:22px; }
.error { color:#a43c38; white-space:pre-wrap; }
.empty { padding:50px 20px; text-align:center; color:var(--muted); }
dialog { border:1px solid var(--line); border-radius:12px; max-width:700px; width:90%; max-height:85vh; overflow:auto; padding:26px; }
dialog::backdrop { background:#182c4e66; }
dialog img { max-width:260px; display:block; margin:20px auto; }
#toast { position:fixed; top:86px; left:50%; transform:translateX(-50%); background:#1b2d48; color:white; padding:12px 22px; border-radius:8px; z-index:30; display:none; max-width:90%; box-shadow:0 6px 24px #15253a22; }
.mobile-capture { max-width:620px; margin:auto; }
.full { width:100%; }
a { color:var(--blue); }
.note { border-left:3px solid #9ab9ed; padding-left:14px; color:var(--muted); }
@media(max-width:1100px) {
  .review-grid { grid-template-columns:1fr; }
  .rule-row { grid-template-columns:110px 70px 1fr 50px; }
}
@media(max-width:760px) {
  header { height:64px; padding:0 18px; }
  .brand { font-size:25px; }
  .brand span { font-size:16px; margin-left:10px; }
  main { padding:20px 14px; }
  .layout,.grid2,.work-grid,.review-grid { grid-template-columns:minmax(0,1fr); }
  .nav { flex-direction:row; overflow:auto; }
  .nav button { white-space:nowrap; }
  .page-head { align-items:flex-start; flex-direction:column; }
  .card { padding:18px; }
  .rule-row { grid-template-columns:1fr 75px 52px; }
  .rule-row textarea { grid-column:1/-1; grid-row:2; }
  .rule-row button { grid-column:3; grid-row:1; }
  .task-row { align-items:flex-start; flex-direction:column; }
  .actions button { padding:8px 12px; }
  h1 { font-size:24px; }
  .auth { margin:30px auto; }
  .original { max-height:550px; }
}

/* V2：账户资源独立管理，任务内仅保留目录和两个内容面板。 */
.welcome { padding:22px 0 24px; }
.welcome h1 { font-size:34px; }
.subject-grid { display:grid; grid-template-columns:1.7fr 1fr 1fr; gap:22px; }
.subject { min-height:240px; padding:28px; }
.subject h2 { font-size:26px; margin:16px 0 12px; }
.subject.available { border-top:3px solid var(--blue); }
.subject.future { background:#f8fafc; }
.account-menu { position:relative; padding:6px 0; }
.account-avatar { width:44px; height:44px; padding:8px; border-radius:50%; display:flex; align-items:center; justify-content:center; }
.account-dropdown { display:none; position:absolute; right:0; top:100%; z-index:15; background:white; box-shadow:0 8px 30px #213b5b22; border:1px solid var(--line); border-radius:10px; min-width:180px; padding:8px; }
.account-menu:hover .account-dropdown,.account-menu:focus-within .account-dropdown,.account-menu.is-open .account-dropdown { display:block; }
.account-dropdown button { width:100%; text-align:center; border:0; padding:10px 14px; margin:2px 0; border-radius:8px; transition:background-color .16s ease,color .16s ease; }
.account-dropdown button:hover,.account-dropdown button:focus-visible { background:#eaf1ff; color:var(--blue); }
.word-count { color:var(--muted); font-size:13px; }
.essay-title { text-align:center; }

.resource-tabs { display:flex; gap:10px; margin-bottom:22px; }
.task-layout { display:grid; grid-template-columns:224px minmax(0,1fr); gap:22px; align-items:start; }
.task-directory { position:sticky; top:20px; padding:18px; }
#directory-list { max-height:calc(100vh - 370px); min-height:220px; overflow:auto; margin:14px -6px; }
.directory-item { background:transparent; color:var(--muted); width:100%; text-align:left; display:flex; flex-direction:row; align-items:center; justify-content:space-between; gap:8px; padding:10px 8px; margin-bottom:3px; min-height:44px; border:1px solid transparent; }
.directory-item strong { font-size:14px; font-weight:500; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.directory-item .tag { flex-shrink:0; font-size:11px; padding:2px 5px; white-space:nowrap; }
.directory-item.selected { border-color:#b9d0fc; background:#eaf1ff; color:var(--blue); }
.workspace-columns { display:grid; grid-template-columns:minmax(0,1.5fr) minmax(330px,1fr); gap:22px; align-items:start; }
.paper-panel,.score-panel { min-height:640px; }
.paper-panel .page-head { align-items:flex-start; }
.paper-panel h2 { margin-bottom:6px; }
.rubric-summary { margin:22px 0; }
.rubric-summary p { margin-top:6px; }
.selected-label { font-size:18px; color:var(--blue); }
.service-notice { padding:12px 16px; margin:0 0 20px; border:1px solid #ead5a3; border-radius:8px; background:#fff8e8; color:#805b13; }
.compact { padding:22px; text-align:left; }
.file-button { display:inline-block; font:inherit; border:1px solid var(--line); background:white; border-radius:7px; padding:10px 18px; margin:0; cursor:pointer; }
.visually-hidden { position:absolute!important; width:1px!important; height:1px!important; padding:0!important; margin:-1px!important; overflow:hidden!important; clip:rect(0,0,0,0)!important; white-space:nowrap!important; border:0!important; }
.preview-button,.original-image-button { display:block; border:0; background:#f6f8fc; padding:0; width:100%; cursor:zoom-in; overflow:auto; }
.preview-button img { width:100%; max-height:560px; object-fit:contain; display:block; }
.preview-shell { margin:20px 0; }
.view-tabs { background:#f1f5fb; border-radius:8px; padding:7px; margin:22px 0; }
.view-tabs button { padding:8px 12px; }
.paper-content { margin:20px 0; min-height:320px; }
.transcription { white-space:pre-wrap; overflow-wrap:anywhere; font-size:20px; line-height:2; padding:10px 5px; }
.original-image-button img { display:block; width:100%; }
.prewrap { white-space:pre-wrap; }
.deduction { border-top:1px solid var(--line); margin-top:20px; padding-top:20px; }
.deduction input { width:130px; }
.score-panel .sticky-actions { position:static; }
.class-table-head,.class-row { display:grid; grid-template-columns:150px minmax(0,1fr) 78px; gap:10px; align-items:center; margin-bottom:10px; }
.class-table-head { color:var(--muted); font-size:14px; }
.class-row button { padding:9px 10px; }
body.viewing-image { overflow:hidden; }
#image-viewer { position:fixed; inset:0; width:100vw; height:100dvh; max-width:none; max-height:none; margin:0; padding:0; border:0; border-radius:0; overflow:hidden; background:transparent; }
#image-viewer::backdrop { background:rgba(0,0,0,.65); }
.viewer-close { position:absolute; top:20px; right:24px; z-index:2; display:grid; place-items:center; width:44px; height:44px; padding:0; border:0; border-radius:50%; background:rgba(0,0,0,.5); color:white; cursor:pointer; }
.viewer-close:hover { background:rgba(0,0,0,.75); }
#viewer-stage { position:relative; width:100%; height:100%; overflow:hidden; cursor:default; touch-action:none; }
#viewer-image { position:absolute; left:0; top:0; width:auto; height:auto; max-width:none; max-height:none; margin:0; display:block; transform-origin:0 0; user-select:none; will-change:transform; }
@media(max-width:1200px) {
  .task-layout { grid-template-columns:200px minmax(0,1fr); gap:16px; }
  .workspace-columns { grid-template-columns:minmax(0,1fr) minmax(280px,.9fr); gap:16px; }
  .paper-panel,.score-panel { padding:18px; }
  .task-heading { align-items:flex-start; flex-direction:column; }
}
@media(max-width:900px) {
  .workspace-columns { grid-template-columns:minmax(0,1fr); }
  .subject-grid { grid-template-columns:1fr 1fr; }
  .subject.available { grid-column:1/-1; }
}
@media(max-width:760px) {
  #account { gap:4px; font-size:13px; }
  #account button { padding:6px 8px; }
  .account-name { display:none; }
  .brand span { font-size:14px; }
  .task-layout { grid-template-columns:minmax(0,1fr); }
  .task-directory { position:static; }
  #directory-list { min-height:0; max-height:180px; }
  .paper-panel,.score-panel { min-height:0; }
  .welcome h1 { font-size:28px; }
  .subject-grid { gap:12px; }
  .subject { padding:18px; min-height:190px; }
  .subject h2 { font-size:22px; }
  .class-table-head,.class-row { grid-template-columns:90px minmax(0,1fr) 65px; gap:6px; }
}

/* Compact paper toolbar, task context and shared message dialogs. */
.paper-toolbar { display:flex; align-items:center; flex-wrap:wrap; gap:10px 16px; margin:22px 0 12px; }
.paper-toolbar .view-tabs { margin:0; flex-shrink:0; }
.paper-toolbar .word-count { flex:1; min-width:180px; font-size:12px; line-height:1.7; }
.paper-hint { margin:0 0 18px; }
.task-title-wrap { position:relative; width:fit-content; }
.task-title-wrap h1 { cursor:pointer; transition:color .18s ease,transform .18s ease; }
.task-title-wrap:hover h1,.task-title-wrap:focus-within h1 { color:var(--blue); transform:translateY(-2px); }
@media(prefers-reduced-motion:reduce) { .task-title-wrap h1 { transition:none; transform:none; } }
.assignment-popover { display:none; position:absolute; z-index:20; left:calc(100% + 28px); top:0; width:clamp(300px,40vw,640px); max-height:45vh; overflow:auto; padding:20px; background:white; border:1px solid var(--line); border-radius:12px; box-shadow:0 12px 36px #213b5b22; }
.assignment-popover::before { content:''; position:absolute; right:100%; top:0; width:30px; height:100%; }
.assignment-popover div { white-space:pre-wrap; overflow-wrap:anywhere; line-height:1.8; margin-top:10px; }
.task-title-wrap:hover .assignment-popover,.task-title-wrap:focus-within .assignment-popover { display:block; }
.account-dropdown { width:190px; min-width:190px; padding:8px; }
.account-profile { padding:10px 8px 12px; border-bottom:1px solid var(--line); margin-bottom:6px; text-align:center; overflow-wrap:anywhere; }
.notice-dialog { max-width:440px; padding:28px; box-shadow:0 18px 70px #213b5b33; color:#1b2d48; }
.notice-dialog h2 { margin-top:0; }
.notice-message { white-space:pre-wrap; overflow-wrap:anywhere; line-height:1.8; color:var(--muted); }
.notice-actions { display:flex; justify-content:flex-end; gap:12px; margin-top:26px; }
@media(max-width:1000px) { .assignment-popover { left:0; top:100%; width:min(640px,calc(100vw - 64px)); } }

.admin-badge { display:inline-block; padding:2px 8px; color:#805709; background:#fff4d6; border-radius:6px; font-size:12px; white-space:nowrap; }
.account-profile .admin-account-link { margin:0; padding:0; background:transparent; color:#fb7299; border:0; box-shadow:none; }
.account-profile .admin-account-link:hover,.account-profile .admin-account-link:focus-visible { background:transparent; color:#f25d8e; }
.admin-metrics { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px; }
.admin-metric { background:#f3f6fb; padding:18px; border-radius:10px; }
.admin-metric span { color:var(--muted); display:block; }
.admin-metric strong { display:block; font-size:26px; margin-top:6px; color:var(--blue); }
.admin-table-scroll { overflow:auto; }
.admin-table { width:100%; border-collapse:collapse; font-size:14px; }
.admin-table th,.admin-table td { padding:12px 10px; border-bottom:1px solid var(--line); text-align:left; vertical-align:top; }
.admin-table th { background:#f3f6fb; white-space:nowrap; }
.admin-table button { padding:6px 10px; white-space:nowrap; }
.admin-table tr:hover td { background:#f9fbff; }
.admin-pager { display:flex; justify-content:flex-end; align-items:center; gap:12px; margin-top:20px; }
.admin-filter { display:flex; flex-wrap:wrap; align-items:flex-end; gap:12px; margin-bottom:20px; }
.admin-filter .field { flex:1; min-width:140px; margin:0; }
.admin-filter button { margin-bottom:0; }
.admin-section { margin-top:28px; }
.trace-attempt { border-top:1px solid var(--line); margin-top:20px; padding-top:12px; }
.trace-call { padding:14px; border:1px solid var(--line); border-radius:8px; margin:12px 0; }
.trace-call pre { background:#f3f6fb; padding:14px; white-space:pre-wrap; overflow-wrap:anywhere; max-height:360px; overflow:auto; font-size:13px; }
@media(max-width:700px) { .admin-metrics { grid-template-columns:repeat(2,minmax(0,1fr)); } }

#admin-account-filter { flex-wrap:nowrap; max-width:460px; flex:1; }
#admin-account-filter input { flex:1; }
#admin-account-filter button { flex-shrink:0; }

.grading-service-status { display:flex; flex-wrap:wrap; align-items:center; gap:12px; margin-top:24px; padding:16px; border:1px solid var(--line); border-radius:10px; }

.dialog-close-form { position:absolute; top:12px; right:12px; margin:0; }
.dialog-close { display:flex; align-items:center; justify-content:center; padding:6px; border:0; background:transparent; color:var(--muted); border-radius:50%; }
.dialog-close:hover { background:#edf2fa; color:#1b2d48; }
#dialog-content > h2:first-child { padding-right:30px; }
.pair-footer { display:flex; align-items:center; gap:12px; margin-top:18px; }
.pair-footer input { flex:1; }
.pair-footer button { flex-shrink:0; }
@media(max-width:600px) { .pair-footer { flex-wrap:wrap; } .pair-footer input { flex-basis:100%; } }