:root {
  --page: #f4f0ea;
  --paper: #fffaf3;
  --paper-strong: #ffffff;
  --ink: #2b2621;
  --muted: #73685d;
  --line: #ded2c3;
  --accent: #7f6b50;
  --accent-dark: #594b39;
  --accent-light: #d8c8b3;
  --good: #55765d;
  --good-light: #e6efe7;
  --warn: #8b5e34;
  --warn-light: #f4e9da;
  --danger: #934c4c;
  --danger-light: #f5e4e2;
  --shadow: 0 18px 50px rgba(67, 54, 39, .09);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { min-height: 100%; }
body {
  min-height: 100vh;
  margin: 0;
  background: radial-gradient(circle at 10% 0%, rgba(216, 200, 179, .35), transparent 34rem), var(--page);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: var(--accent-dark); }
a:hover { color: var(--ink); }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(127, 107, 80, .18);
  background: rgba(255, 250, 243, .94);
  backdrop-filter: blur(12px);
}
.brand { display: inline-flex; gap: 10px; align-items: center; color: var(--ink); font-weight: 800; text-decoration: none; }
.brand-dot, .kicker-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(127, 107, 80, .13);
}
.topnav { display: flex; gap: 8px; align-items: center; }
.topnav a { padding: 9px 13px; border-radius: 12px; color: var(--muted); font-weight: 650; text-decoration: none; }
.topnav a:hover { background: var(--page); color: var(--ink); }
.user-menu { display: flex; gap: 14px; align-items: center; }
.user-menu form { margin: 0; }
.user-code { padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .88rem; font-weight: 750; }
.link-button { padding: 0; border: 0; background: none; color: var(--accent-dark); cursor: pointer; text-decoration: underline; }

.page-shell { width: min(1180px, calc(100% - 36px)); margin: 0 auto; padding: 42px 0 72px; }
.auth-shell { width: min(520px, calc(100% - 32px)); padding-top: 8vh; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 14px; font-size: clamp(2rem, 4vw, 3.35rem); line-height: 1.07; letter-spacing: -.04em; }
h2 { margin-bottom: 14px; font-size: clamp(1.3rem, 2vw, 1.75rem); line-height: 1.2; }
h3 { margin-bottom: 9px; }
.lead { max-width: 68ch; color: var(--muted); font-size: 1.05rem; }
.muted { color: var(--muted); }
.kicker { display: flex; gap: 10px; align-items: center; margin-bottom: 17px; color: var(--accent-dark); font-size: .78rem; font-weight: 850; letter-spacing: .11em; text-transform: uppercase; }

.hero { display: grid; grid-template-columns: minmax(0, 1.8fr) minmax(260px, .8fr); gap: 24px; align-items: stretch; margin-bottom: 30px; }
.hero-card, .side-card, .panel, .table-panel, .auth-card, .worksheet { border: 1px solid rgba(127, 107, 80, .19); border-radius: var(--radius); background: var(--paper); box-shadow: var(--shadow); }
.hero-card { min-height: 260px; padding: clamp(28px, 5vw, 58px); }
.compact-hero .hero-card { min-height: 0; }
.side-card { padding: 30px; }
.action-card { display: flex; flex-direction: column; gap: 12px; justify-content: center; }
.auth-card { padding: clamp(26px, 7vw, 48px); }
.auth-card .brand { margin-bottom: 36px; }
.section-gap { margin-top: 28px; }
.panel, .table-panel { padding: clamp(20px, 4vw, 34px); }
.panel-heading { display: flex; gap: 20px; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.panel-heading h1, .panel-heading h2 { margin-bottom: 0; }
.narrow-card, .login-card {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: clamp(26px, 5vw, 46px);
  border: 1px solid rgba(127, 107, 80, .19);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}
.wide-form { width: min(860px, 100%); }
.login-shell { width: min(520px, calc(100% - 32px)); padding-top: 8vh; }
.login-card .btn { width: 100%; margin-top: 8px; }
.fine-print { margin: 26px 0 0; color: var(--muted); font-size: .86rem; }
.form-stack, .form-grid { display: grid; gap: 18px; }
.form-stack > div, .form-grid > div { min-width: 0; }
.form-actions { padding-top: 8px; }
.form-grid.two-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.advanced-editor-form { display: grid; gap: 24px; }
.editor-block {
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid rgba(127, 107, 80, .19);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}
.editor-block.compact-block { padding-block: 22px; }
.editor-block-head, .preview-toolbar, .content-list-head {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 22px;
}
.editor-block-head h2, .preview-toolbar h3, .content-list-head h3 { margin-bottom: 5px; }
.editor-card, .content-list-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: rgba(255, 255, 255, .5);
}
.editor-card + .editor-card { margin-top: 16px; }
.topic-title-field { margin-bottom: 18px; }
.count-card { margin-top: 16px; }
.count-grid { display: grid; grid-template-columns: repeat(5, minmax(110px, 1fr)); gap: 13px; }
.content-editor-stack { display: grid; gap: 18px; margin-top: 18px; }
.content-list-card [data-new-item] { min-height: 118px; }
.editor-add-button { width: 100%; margin-top: 8px; }
.item-editor-list { display: grid; gap: 11px; margin-top: 12px; }
.item-editor-row { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.item-editor-row textarea { min-height: 90px; }
.item-index { display: grid; width: 28px; height: 28px; place-items: center; border-radius: 50%; background: var(--accent-light); font-size: .8rem; font-weight: 850; }
.item-actions { grid-column: 2; display: flex; flex-wrap: wrap; gap: 7px; }
.item-actions .btn { min-height: 32px; padding: 6px 9px; font-size: .78rem; }
.custom-title-field { margin-bottom: 0; }
.custom-title-hint { margin-bottom: 16px; }
.group-editor-layout { display: grid; grid-template-columns: minmax(280px, .9fr) minmax(320px, 1.1fr); gap: 18px; align-items: start; }
.group-editor-controls, .group-editor-result { display: grid; gap: 17px; padding: 18px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255, 255, 255, .5); }
.group-editor-result h3 { margin: 0; }
.group-editor-result .group-grid:empty { display: none; }
.group-editor-result .group-card { padding: 18px; }
.group-editor-result .group-card h4 { margin-bottom: 10px; }
.group-editor-result .group-card ol { margin: 0; padding-left: 22px; }
.check-line small { display: block; margin-top: 5px; color: var(--muted); font-weight: 500; line-height: 1.5; }
.roster-toolbar { display: grid; grid-template-columns: minmax(230px, 1fr) auto auto; gap: 16px; align-items: end; margin-bottom: 18px; }
.roster-search { margin: 0; }
.choice-grid > div { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 9px; }
.choice-grid > div > div { min-width: 0; }
.choice-grid label { display: flex; gap: 9px; align-items: center; min-height: 46px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px; background: rgba(255, 255, 255, .6); cursor: pointer; font-weight: 700; }
.choice-grid label:has(input:checked) { border-color: var(--accent); background: var(--accent-light); }
.choice-grid input[type="checkbox"] { width: 18px; height: 18px; flex: 0 0 auto; }
.roster-choice-grid { max-height: 520px; overflow: auto; padding: 3px; }
.recipient-layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: 18px; }
.recipient-panel { display: grid; gap: 14px; align-content: start; padding: 20px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255, 255, 255, .5); }
.recipient-panel h3 { margin: 0; }
.recipient-choice-grid { max-height: 330px; overflow: auto; padding: 3px; }
.instructor-choice-grid > div { grid-template-columns: 1fr; }
.assignment-audience { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-bottom: 24px; }
.preview-panel { margin-top: 22px; padding-top: 26px; border-top: 1px solid var(--line); }
.preview-sheet { margin-top: 15px; border-radius: 17px; box-shadow: none; }
.preview-sheet-head { padding: 24px; }
.preview-sheet .worksheet-section { padding: 22px 24px; }
.preview-answer-box { min-height: 65px; padding: 13px; border: 1px dashed #cdbfac; border-radius: 10px; color: var(--muted); background: var(--page); }
.check-line { display: flex; gap: 10px; align-items: flex-start; font-weight: 750; cursor: pointer; }
.check-line input { width: 18px; height: 18px; flex: 0 0 auto; margin: 3px 0 0; }
.check-line span { display: block; }
.form-check { min-height: 48px; align-items: center; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: rgba(255, 255, 255, .55); }
.hint { margin: 6px 0 0; color: var(--muted); font-size: .88rem; }
.section-gap-small { margin-top: 15px; }
.compact-notice { padding: 10px 12px; font-size: .9rem; }
.file-drop input[type="file"] { min-height: 76px; padding: 18px; border-style: dashed; background: var(--page); }
.editor-savebar { position: sticky; z-index: 10; bottom: 14px; display: flex; gap: 20px; align-items: center; justify-content: space-between; padding: 17px 20px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255, 250, 243, .96); box-shadow: 0 14px 40px rgba(67, 54, 39, .16); backdrop-filter: blur(10px); }
.two-column-layout, .dashboard-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.stats-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.stats-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.panel-span { grid-column: 1 / -1; }
.list-stack, .group-grid { display: grid; gap: 12px; }
.group-grid { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.list-card { display: grid; gap: 3px; padding: 15px; border: 1px solid var(--line); border-radius: 13px; background: rgba(255, 255, 255, .5); }
.list-card span { color: var(--muted); font-size: .9rem; }
.row-card { grid-template-columns: 1fr auto; gap: 14px; align-items: center; }
.row-card > div:first-child { display: grid; }
.empty-state { display: grid; min-height: 240px; place-items: center; padding: 34px; border: 1px dashed var(--accent-light); border-radius: var(--radius); background: rgba(255, 250, 243, .55); text-align: center; }
.status-label { display: block; margin-bottom: 7px; color: var(--muted); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }
.big-code { display: block; font: 800 clamp(1.7rem, 5vw, 2.8rem)/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.task-card-head { display: flex; gap: 12px; align-items: start; justify-content: space-between; }
.task-card-head .kicker { margin-top: 7px; }
.kicker.small { font-size: .72rem; }
.meta-list { display: grid; gap: 6px; margin: 3px 0 20px; }
.meta-list div { display: grid; grid-template-columns: 130px 1fr; gap: 8px; }
.meta-list dt { color: var(--muted); }
.meta-list dd { margin: 0; }
.answer-preview { min-height: 54px; padding: 15px; border: 1px solid var(--line); border-radius: 12px; background: var(--page); white-space: normal; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.task-card, .stat-card, .group-card { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, .55); }
.task-card { display: flex; min-height: 210px; flex-direction: column; }
.task-card .btn { margin-top: auto; align-self: flex-start; }
.stat-card strong { display: block; font-size: 2rem; line-height: 1.1; }
.stat-card span { color: var(--muted); }

.btn { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 10px 18px; border: 1px solid var(--accent-dark); border-radius: 13px; background: var(--accent-dark); color: #fff; font-weight: 750; line-height: 1.2; text-align: center; text-decoration: none; cursor: pointer; }
.btn:hover { background: var(--ink); color: #fff; }
.btn.secondary { border-color: var(--line); background: transparent; color: var(--accent-dark); }
.btn.secondary:hover { border-color: var(--accent); background: var(--page); color: var(--ink); }
.btn.danger { border-color: var(--danger); background: var(--danger); }
.btn.small { min-height: 36px; padding: 7px 12px; border-radius: 10px; font-size: .9rem; }
.button-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

form p { margin-bottom: 19px; }
label { display: block; margin-bottom: 7px; font-size: .92rem; font-weight: 750; }
input, select, textarea { width: 100%; padding: 11px 13px; border: 1px solid #cdbfac; border-radius: 12px; outline: none; background: #fff; color: var(--ink); }
textarea { min-height: 125px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(127, 107, 80, .13); }
input[type="checkbox"] { width: auto; margin-right: 8px; }
select[multiple] { min-height: 130px; }
.helptext { display: block; margin-top: 5px; color: var(--muted); font-size: .86rem; }
.errorlist { margin: 6px 0; padding-left: 20px; color: var(--danger); }

.message-stack { display: grid; gap: 10px; margin-bottom: 22px; }
.notice { padding: 12px 15px; border: 1px solid var(--line); border-radius: 12px; background: rgba(255, 255, 255, .58); }
.notice.success, .notice.good { border-color: #b8ceb9; background: var(--good-light); color: #3d6145; }
.notice.warning, .notice.warn { border-color: #dec3a0; background: var(--warn-light); color: #754b28; }
.notice.error, .notice.danger { border-color: #ddb6b0; background: var(--danger-light); color: #7c3f3f; }
.status-chip { display: inline-block; padding: 5px 9px; border-radius: 999px; background: #ece5db; color: var(--muted); font-size: .78rem; font-weight: 800; }
.status-chip.good { background: var(--good-light); color: var(--good); }
.status-chip.warn { background: var(--warn-light); color: var(--warn); }
.status-chip.danger { background: var(--danger-light); color: var(--danger); }

.responsive-table { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; }
tbody tr:last-child td { border-bottom: 0; }

.worksheet { overflow: hidden; background: var(--paper-strong); }
.sheet-head { display: grid; grid-template-columns: 1fr auto; gap: 28px; padding: clamp(26px, 5vw, 52px); border-bottom: 1px solid var(--line); background: linear-gradient(140deg, var(--paper), #fff); }
.sheet-title { font-size: clamp(2rem, 4vw, 3rem); }
.sheet-meta { display: grid; min-width: 190px; gap: 14px; align-content: center; }
.sheet-meta > div { display: grid; gap: 2px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.meta-label { color: var(--muted); font-size: .78rem; text-transform: uppercase; }
.prompt-box { margin: 28px; padding: 20px; border-left: 5px solid var(--accent); border-radius: 10px; background: var(--page); }
.worksheet-section { padding: 30px clamp(22px, 5vw, 52px); border-bottom: 1px solid var(--line); }
.question-card { display: grid; grid-template-columns: 36px 1fr; gap: 15px; margin-top: 17px; }
.question-number { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 50%; background: var(--accent-light); font-size: .85rem; font-weight: 850; }
.question-content p { margin: 3px 0 12px; }
.question-content textarea { min-height: 140px; }
.submission-bar { position: sticky; bottom: 0; display: flex; gap: 18px; align-items: center; justify-content: space-between; padding: 18px clamp(22px, 5vw, 52px); border-top: 1px solid var(--line); background: rgba(255, 250, 243, .96); backdrop-filter: blur(10px); }
.submission-bar .notice { margin: 0; }
.file-list { display: grid; gap: 9px; }
.file-link { display: flex; justify-content: space-between; padding: 13px 15px; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; }
.file-link:hover { background: var(--page); }

.credential-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.credential-card { break-inside: avoid; padding: 28px; border: 2px solid var(--accent); border-radius: 18px; background: #fff; }
.credential-brand { margin-bottom: 10px; font-size: 1.15rem; font-weight: 850; }
.credential-card dl { margin: 22px 0; }
.credential-card dl div { display: grid; grid-template-columns: 120px 1fr; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.credential-card dt { color: var(--muted); }
.credential-card dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-weight: 800; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }

@media (max-width: 820px) {
  .topbar { position: static; grid-template-columns: 1fr auto; gap: 10px; }
  .topnav { grid-column: 1 / -1; order: 3; overflow-x: auto; }
  .user-code { display: none; }
  .hero, .sheet-head { grid-template-columns: 1fr; }
  .sheet-meta { grid-template-columns: repeat(3, 1fr); }
  .credential-grid { grid-template-columns: 1fr; }
  .two-column-layout, .dashboard-grid { grid-template-columns: 1fr; }
  .stats-grid.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .count-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .group-editor-layout { grid-template-columns: 1fr; }
  .recipient-layout { grid-template-columns: 1fr; }
  .assignment-audience { grid-template-columns: 1fr; }
  .roster-toolbar { grid-template-columns: 1fr; align-items: stretch; }
}
@media (max-width: 560px) {
  .page-shell { width: min(100% - 22px, 1180px); padding-top: 22px; }
  .topbar { padding-inline: 14px; }
  .brand span:last-child { font-size: .94rem; }
  .hero-card, .side-card, .panel, .table-panel, .auth-card { border-radius: 17px; }
  .panel-heading, .submission-bar { align-items: stretch; flex-direction: column; }
  .sheet-meta { grid-template-columns: 1fr; }
  .question-card { grid-template-columns: 30px 1fr; }
  .worksheet-section { padding-inline: 18px; }
  .stats-grid { grid-template-columns: 1fr; }
  .stats-grid.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .row-card { grid-template-columns: 1fr; }
  .form-grid.two-fields { grid-template-columns: 1fr; }
  .editor-block-head, .preview-toolbar, .content-list-head, .editor-savebar { align-items: stretch; flex-direction: column; }
  .count-grid { grid-template-columns: 1fr 1fr; }
  .item-editor-row { grid-template-columns: 28px minmax(0, 1fr); padding: 9px; }
}
@media print {
  @page { size: A4; margin: 12mm; }
  body { background: #fff; font-size: 10pt; }
  .no-print { display: none !important; }
  .page-shell { width: 100%; margin: 0; padding: 0; }
  .credential-grid { grid-template-columns: repeat(2, 1fr); gap: 8mm; }
  .credential-card { padding: 8mm; box-shadow: none; }
  .worksheet { border: 0; box-shadow: none; }
  .worksheet-section { break-inside: avoid; }
}