:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-soft: #f9fafb;
  --text: #111827;
  --muted: #667085;
  --line: #e5e7eb;
  --brand: #4f46e5;
  --brand-strong: #4338ca;
  --brand-soft: #eef2ff;
  --success: #15803d;
  --success-soft: #ecfdf3;
  --warning: #b45309;
  --warning-soft: #fff7ed;
  --pending: #64748b;
  --pending-soft: #f1f5f9;
  --danger: #b42318;
  --shadow: 0 14px 40px rgba(15, 23, 42, 0.07);
  --radius-lg: 22px;
  --radius-md: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
a { color: inherit; }
button { cursor: pointer; }

.brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.brand-link { text-decoration: none; }
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.25);
}
.eyebrow {
  display: inline-block;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
}
.muted { color: var(--muted); }

/* Auth */
.auth-body { background: #fff; }
.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, .95fr);
}
.auth-visual {
  min-height: 100vh;
  padding: 42px 7vw;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    radial-gradient(circle at 18% 16%, rgba(255,255,255,.17), transparent 28%),
    radial-gradient(circle at 84% 78%, rgba(99,102,241,.6), transparent 32%),
    linear-gradient(145deg, #101828 10%, #1e1b4b 52%, #312e81 100%);
}
.auth-visual .brand-mark { background: #fff; color: var(--brand); box-shadow: none; }
.auth-copy { max-width: 660px; }
.auth-copy .eyebrow { color: #c7d2fe; }
.auth-copy h1 {
  margin: 14px 0 18px;
  max-width: 700px;
  font-size: clamp(40px, 5vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.055em;
}
.auth-copy > p {
  max-width: 590px;
  color: #d0d5dd;
  font-size: 18px;
  line-height: 1.7;
}
.auth-benefits { display: grid; gap: 12px; margin-top: 34px; }
.auth-benefits div { display: flex; align-items: center; gap: 10px; color: #eef2ff; font-weight: 600; }
.auth-benefits span {
  width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%;
  background: rgba(255,255,255,.12); font-size: 13px;
}
.auth-note { color: #a5b4fc; font-size: 13px; }
.auth-panel { min-height: 100vh; display: grid; place-items: center; padding: 32px; }
.login-card { width: 100%; max-width: 440px; }
.login-card h2 { margin: 10px 0 8px; font-size: 34px; letter-spacing: -0.04em; }
.mobile-brand { display: none; }
.login-form { display: grid; gap: 18px; margin-top: 28px; }
.login-form label { display: grid; gap: 8px; font-size: 14px; font-weight: 700; }
.login-form input,
.controls input,
.controls select {
  width: 100%;
  border: 1px solid #d0d5dd;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border .2s ease, box-shadow .2s ease;
}
.login-form input { padding: 14px 15px; }
.login-form input:focus,
.controls input:focus,
.controls select:focus { border-color: #818cf8; box-shadow: 0 0 0 4px rgba(99,102,241,.12); }
.alert {
  margin-top: 20px; padding: 12px 14px; border-radius: 12px;
  background: #fef3f2; color: var(--danger); font-size: 14px; font-weight: 600;
}
.demo-hint { margin-top: 18px; color: var(--muted); font-size: 12px; line-height: 1.6; }

/* Buttons */
.btn {
  border: 0; border-radius: 12px; padding: 11px 15px; font-weight: 700;
  transition: transform .15s ease, background .2s ease, box-shadow .2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { color: #fff; background: var(--brand); box-shadow: 0 8px 20px rgba(79,70,229,.22); }
.btn-primary:hover { background: var(--brand-strong); }
.btn-secondary { color: #344054; background: #fff; border: 1px solid #d0d5dd; }
.btn-secondary:hover { background: #f9fafb; }
.btn-full { width: 100%; min-height: 48px; }

/* Dashboard */
.app-shell { min-height: 100vh; display: grid; grid-template-columns: 250px minmax(0, 1fr); }
.sidebar {
  position: sticky; top: 0; height: 100vh;
  padding: 28px 20px;
  background: #fff;
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column;
}
.side-nav { margin-top: 34px; }
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 11px 12px; border-radius: 11px; text-decoration: none;
  color: #475467; font-size: 14px; font-weight: 700;
}
.nav-item.active { color: var(--brand); background: var(--brand-soft); }
.nav-icon { font-size: 18px; }
.sidebar-footer { margin-top: auto; padding-top: 20px; border-top: 1px solid var(--line); }
.student-mini { display: flex; gap: 10px; align-items: center; min-width: 0; }
.student-mini .avatar {
  width: 38px; height: 38px; display: grid; place-items: center; flex: 0 0 auto;
  border-radius: 50%; background: #f2f4f7; font-weight: 800; color: #344054;
}
.student-mini div:last-child { min-width: 0; }
.student-mini strong, .student-mini span { display: block; }
.student-mini strong { font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.student-mini span { margin-top: 2px; color: var(--muted); font-size: 11px; }
.logout-btn { border: 0; background: transparent; padding: 10px 0 0; color: #667085; font-size: 12px; font-weight: 700; }
.logout-btn:hover { color: var(--danger); }
.dashboard { width: 100%; max-width: 1500px; padding: 38px clamp(24px, 4vw, 60px) 70px; margin: 0 auto; }
.topbar h1 { margin: 8px 0 8px; font-size: clamp(30px, 4vw, 44px); letter-spacing: -0.045em; }
.topbar p { margin: 0; color: var(--muted); }

.progress-card {
  margin-top: 30px; padding: 24px;
  display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(360px, .8fr); gap: 30px;
  border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow);
}
.progress-main { display: grid; align-content: center; }
.progress-label-row { display: flex; align-items: end; justify-content: space-between; gap: 20px; }
.progress-label-row div strong { display: block; margin-top: 6px; font-size: 34px; letter-spacing: -0.04em; }
.progress-label-row > span { color: var(--muted); font-size: 13px; font-weight: 600; }
.progress-track { height: 10px; margin-top: 18px; border-radius: 999px; overflow: hidden; background: #eef2f6; }
.progress-fill { height: 100%; border-radius: inherit; background: linear-gradient(90deg, #4f46e5, #7c3aed); transition: width .3s ease; }
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.stat-card { min-width: 0; padding: 14px; display: flex; align-items: center; gap: 10px; border-radius: 14px; background: var(--surface-soft); }
.stat-card strong, .stat-card span { display: block; }
.stat-card strong { font-size: 18px; }
.stat-card div span { margin-top: 2px; color: var(--muted); font-size: 11px; }
.stat-dot { width: 10px; height: 10px; flex: 0 0 auto; border-radius: 50%; }
.stat-dot.done { background: #22c55e; }
.stat-dot.revisit { background: #f59e0b; }
.stat-dot.pending { background: #94a3b8; }

.controls { margin-top: 22px; display: grid; grid-template-columns: minmax(260px, 1fr) auto; gap: 14px; align-items: center; }
.search-wrap { position: relative; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: #98a2b3; }
.controls input { padding: 12px 14px 12px 40px; }
.filter-row { display: flex; gap: 10px; }
.controls select { min-width: 150px; padding: 12px 36px 12px 12px; }

.question-section { margin-top: 34px; }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 14px; }
.section-heading h2 { margin: 0; font-size: 22px; letter-spacing: -0.03em; }
.section-heading p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.question-list { display: grid; gap: 12px; }
.question-card {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, auto); gap: 22px; align-items: center;
  padding: 20px; border: 1px solid var(--line); border-radius: 17px; background: #fff;
  transition: box-shadow .2s ease, border-color .2s ease, transform .2s ease;
}
.question-card:hover { border-color: #d8dbe5; box-shadow: 0 10px 28px rgba(15,23,42,.055); transform: translateY(-1px); }
.question-card[hidden] { display: none; }
.question-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.topic-pill, .difficulty-pill { padding: 5px 9px; border-radius: 999px; font-size: 10px; font-weight: 800; letter-spacing: .03em; }
.topic-pill { color: #475467; background: #f2f4f7; }
.difficulty-easy { color: #067647; background: #ecfdf3; }
.difficulty-medium { color: #b54708; background: #fffaeb; }
.difficulty-hard { color: #b42318; background: #fef3f2; }
.question-content h3 { margin: 10px 0 7px; font-size: 18px; letter-spacing: -0.025em; }
.question-content p { margin: 0; max-width: 820px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.question-link { display: inline-block; margin-top: 10px; color: var(--brand); font-size: 12px; font-weight: 800; text-decoration: none; }
.question-link:hover { text-decoration: underline; }
.status-area { display: grid; justify-items: end; gap: 7px; }
.status-label { color: var(--muted); font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.status-switch { display: inline-grid; grid-template-columns: repeat(3, 1fr); padding: 4px; border-radius: 12px; background: #f2f4f7; }
.status-btn { border: 0; padding: 9px 11px; border-radius: 9px; background: transparent; color: #667085; font-size: 11px; font-weight: 800; transition: .18s ease; }
.status-btn:hover:not(:disabled) { color: #344054; }
.status-btn:disabled { cursor: wait; opacity: .75; }
.status-btn.pending.active { background: #fff; color: var(--pending); box-shadow: 0 2px 7px rgba(15,23,42,.08); }
.status-btn.revisit.active { background: var(--warning-soft); color: var(--warning); box-shadow: 0 2px 7px rgba(180,83,9,.10); }
.status-btn.done.active { background: var(--success-soft); color: var(--success); box-shadow: 0 2px 7px rgba(21,128,61,.10); }
.save-state { min-height: 14px; color: var(--muted); font-size: 10px; }
.empty-state { padding: 70px 24px; text-align: center; border: 1px dashed #d0d5dd; border-radius: var(--radius-lg); background: #fff; }
.empty-state[hidden] { display: none; }
.empty-icon { width: 48px; height: 48px; margin: 0 auto 14px; display: grid; place-items: center; border-radius: 50%; background: #f2f4f7; color: #667085; font-size: 24px; }
.empty-state h3 { margin: 0; }
.empty-state p { margin: 8px 0 18px; color: var(--muted); font-size: 13px; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px);
  padding: 11px 15px; border-radius: 999px; background: #101828; color: #fff;
  font-size: 12px; font-weight: 700; opacity: 0; pointer-events: none; transition: .2s ease; box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast[data-type='error'] { background: #b42318; }
.center-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.error-card { max-width: 480px; padding: 34px; text-align: center; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
.error-card .brand-mark { margin: 0 auto; }
.error-card p { color: var(--muted); }

@media (max-width: 1050px) {
  .app-shell { grid-template-columns: 78px minmax(0, 1fr); }
  .sidebar { padding: 24px 14px; align-items: center; }
  .brand-row > span, .nav-item:not(.active) { display: none; }
  .nav-item { justify-content: center; }
  .nav-item.active { width: 48px; height: 48px; padding: 0; }
  .nav-item.active .nav-icon { font-size: 22px; }
  .sidebar-footer { width: 100%; }
  .student-mini { justify-content: center; }
  .student-mini div:last-child, .logout-btn { display: none; }
  .progress-card { grid-template-columns: 1fr; }
  .controls { grid-template-columns: 1fr; }
  .filter-row { display: grid; grid-template-columns: repeat(3, 1fr); }
  .controls select { min-width: 0; }
}

@media (max-width: 760px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-visual { display: none; }
  .auth-panel { padding: 24px; }
  .mobile-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 48px; font-size: 18px; font-weight: 800; }
  .app-shell { display: block; }
  .sidebar { position: static; width: 100%; height: auto; padding: 14px 18px; flex-direction: row; justify-content: space-between; border-right: 0; border-bottom: 1px solid var(--line); }
  .sidebar .brand-row > span { display: inline; }
  .side-nav { display: none; }
  .sidebar-footer { margin: 0; padding: 0; border: 0; }
  .student-mini { display: none; }
  .logout-btn { display: block; padding: 10px; }
  .dashboard { padding: 26px 18px 50px; }
  .topbar h1 { font-size: 30px; }
  .progress-card { padding: 18px; }
  .stat-grid { grid-template-columns: repeat(3, 1fr); }
  .stat-card { padding: 11px; }
  .filter-row { grid-template-columns: 1fr; }
  .question-card { grid-template-columns: 1fr; padding: 17px; }
  .status-area { justify-items: stretch; }
  .status-label { text-align: left; }
  .status-switch { width: 100%; }
  .section-heading { align-items: end; }
}

@media (max-width: 470px) {
  .progress-label-row { align-items: start; flex-direction: column; gap: 4px; }
  .stat-grid { gap: 6px; }
  .stat-card { display: grid; gap: 5px; }
  .section-heading { align-items: start; }
  .section-heading .btn { padding: 9px 10px; font-size: 11px; }
  .status-btn { padding-inline: 7px; }
}


/* Google-only authentication */
.google-btn {
  width: 100%;
  min-height: 52px;
  margin-top: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border: 1px solid #d0d5dd;
  border-radius: 12px;
  background: #fff;
  color: #1d2939;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 1px 2px rgba(16,24,40,.04);
  transition: border-color .18s ease, background .18s ease, box-shadow .18s ease, transform .15s ease;
}
.google-btn:hover {
  border-color: #b8c0cc;
  background: #f9fafb;
  box-shadow: 0 4px 12px rgba(16,24,40,.06);
}
.google-btn:active { transform: translateY(1px); }
.google-btn:focus-visible {
  outline: none;
  border-color: #818cf8;
  box-shadow: 0 0 0 4px rgba(99,102,241,.12);
}
.google-security-note {
  margin-top: 18px;
  padding: 13px 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border: 1px solid #eaecf0;
  border-radius: 12px;
  background: #f9fafb;
}
.google-security-note p {
  margin: 0;
  color: #667085;
  font-size: 11px;
  line-height: 1.55;
}
.security-icon {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #ecfdf3;
  color: #067647;
  font-size: 11px;
  font-weight: 900;
}
.avatar-image { object-fit: cover; }
.student-mini span {
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Platform metadata */
.platform-pill,
.rating-pill,
.tag-pill,
.question-total-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .02em;
}
.platform-pill { padding: 5px 9px; color: #344054; background: #f2f4f7; }
.platform-leetcode { color: #8a4b08; background: #fff7ed; }
.platform-codeforces { color: #175cd3; background: #eff8ff; }
.platform-atcoder { color: #344054; background: #f2f4f7; }
.rating-pill { padding: 5px 9px; color: #6941c6; background: #f4f3ff; }
.tag-pill { padding: 5px 8px; color: #475467; background: #f2f4f7; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.topbar.admin-topbar,
.topbar:has(.desktop-action) {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}
.desktop-action { flex: 0 0 auto; text-decoration: none; }

/* Admin portal */
.admin-dashboard { max-width: 1380px; }
.admin-import-card {
  margin-top: 30px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.admin-import-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}
.admin-import-heading h2 { margin: 7px 0 8px; font-size: 24px; letter-spacing: -.035em; }
.admin-import-heading p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.question-total-pill { padding: 8px 12px; color: #475467; background: #f2f4f7; white-space: nowrap; }
.question-total-pill strong { margin-right: 4px; color: var(--text); }
.import-form { margin-top: 24px; }
.import-url-field { display: grid; gap: 8px; font-size: 13px; font-weight: 800; }
.import-url-field small { color: var(--muted); font-size: 11px; font-weight: 500; line-height: 1.5; }
.import-url-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; }
.import-url-row input,
.metadata-options input,
.metadata-options select {
  width: 100%;
  border: 1px solid #d0d5dd;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border .2s ease, box-shadow .2s ease;
}
.import-url-row input { min-height: 48px; padding: 12px 14px; }
.import-url-row input:focus,
.metadata-options input:focus,
.metadata-options select:focus {
  border-color: #818cf8;
  box-shadow: 0 0 0 4px rgba(99,102,241,.12);
}
.admin-inline-error {
  margin-top: 14px;
  padding: 11px 13px;
  border-radius: 11px;
  color: var(--danger);
  background: #fef3f2;
  font-size: 12px;
  font-weight: 700;
}
.admin-inline-error[hidden], .metadata-preview[hidden] { display: none; }
.metadata-preview {
  margin-top: 20px;
  padding: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
  gap: 28px;
  border: 1px solid #d9d6fe;
  border-radius: 16px;
  background: #fafaff;
}
.metadata-preview-main h3 { margin: 10px 0 6px; font-size: 21px; letter-spacing: -.03em; }
.metadata-preview-main p { margin: 0; font-size: 12px; }
.metadata-options { display: grid; gap: 12px; }
.metadata-options label { display: grid; gap: 7px; color: #344054; font-size: 11px; font-weight: 800; }
.metadata-options label em { color: var(--muted); font-style: normal; font-weight: 500; }
.metadata-options input,
.metadata-options select { padding: 10px 11px; }
.admin-bank-section { margin-top: 34px; }
.admin-question-list { display: grid; gap: 10px; }
.admin-question-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 17px 18px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
}
.admin-question-main { min-width: 0; }
.admin-question-main h3 { margin: 9px 0 5px; font-size: 16px; letter-spacing: -.02em; }
.admin-question-main > a {
  display: block;
  max-width: 860px;
  overflow: hidden;
  color: var(--brand);
  font-size: 11px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: none;
}
.admin-question-main > a:hover { text-decoration: underline; }
.btn-danger-soft { color: var(--danger); background: #fff; border: 1px solid #fecdca; }
.btn-danger-soft:hover { background: #fef3f2; }

@media (max-width: 880px) {
  .metadata-preview { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .topbar.admin-topbar,
  .topbar:has(.desktop-action) { display: block; }
  .desktop-action { display: inline-flex; margin-top: 16px; }
  .admin-import-card { padding: 18px; }
  .admin-import-heading { display: block; }
  .question-total-pill { margin-top: 14px; }
  .import-url-row { grid-template-columns: 1fr; }
  .admin-question-row { grid-template-columns: 1fr; }
  .admin-question-row .btn { justify-self: start; }
}
.difficulty-unrated { color: #475467; background: #f2f4f7; }

/* Multi-sheet question system */
textarea { font: inherit; }
.back-link { display: inline-block; margin-bottom: 8px; color: var(--brand); font-size: 12px; font-weight: 800; text-decoration: none; }
.back-link:hover { text-decoration: underline; }
.sheet-title-line { margin-top: 10px; }
.access-pill, .sheet-count-pill, .email-chip {
  display: inline-flex; align-items: center; border-radius: 999px; font-size: 10px; font-weight: 800;
}
.access-pill { padding: 6px 9px; }
.access-pill.public { color: #067647; background: #ecfdf3; }
.access-pill.restricted { color: #b54708; background: #fffaeb; }
.sheet-count-pill { padding: 5px 9px; color: #475467; background: #f2f4f7; }
.sheet-count-pill.multi { color: #6941c6; background: #f4f3ff; }
.tag-row.compact { margin-top: 7px; }
.membership-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 8px; font-size: 11px; color: var(--muted); }
.membership-row a { padding: 4px 7px; border-radius: 999px; color: #344054; background: #f2f4f7; text-decoration: none; font-weight: 700; }
.membership-row a:hover { background: #eaecf0; }
.admin-row-actions { display: flex; gap: 8px; align-items: center; }
.admin-question-editable { align-items: start; }
.question-edit-form { grid-column: 1 / -1; padding-top: 16px; border-top: 1px solid var(--line); }
.question-edit-form[hidden] { display: none; }
.admin-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.admin-form-grid label, .grant-access-form label { display: grid; gap: 7px; color: #344054; font-size: 11px; font-weight: 800; }
.admin-form-grid input, .admin-form-grid select, .admin-form-grid textarea,
.grant-access-form input {
  width: 100%; border: 1px solid #d0d5dd; border-radius: 12px; background: #fff; color: var(--text); outline: none; padding: 11px 12px;
}
.admin-form-grid input:focus, .admin-form-grid select:focus, .admin-form-grid textarea:focus,
.grant-access-form input:focus { border-color: #818cf8; box-shadow: 0 0 0 4px rgba(99,102,241,.12); }
.span-2 { grid-column: 1 / -1; }
.sheet-checkbox-field { margin: 14px 0 0; padding: 14px; border: 1px solid var(--line); border-radius: 13px; }
.sheet-checkbox-field legend { padding: 0 6px; color: #344054; font-size: 11px; font-weight: 800; }
.sheet-checkbox-field legend em { color: var(--muted); font-style: normal; font-weight: 500; }
.sheet-checkbox-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.check-row { display: flex !important; grid-template-columns: none !important; align-items: center; gap: 8px !important; padding: 9px 10px; border-radius: 10px; background: #f9fafb; font-size: 11px !important; font-weight: 700 !important; }
.check-row input { width: auto !important; margin: 0; }
.form-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 14px; }
.metadata-options-wide { align-content: start; }
.metadata-options-wide .sheet-checkbox-field { margin-top: 0; }

.student-sheet-grid { margin-top: 30px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.student-sheet-card { min-height: 230px; padding: 22px; display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 18px; background: #fff; text-decoration: none; box-shadow: 0 8px 28px rgba(15,23,42,.04); transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.student-sheet-card:hover { transform: translateY(-2px); border-color: #d0d5dd; box-shadow: 0 14px 34px rgba(15,23,42,.07); }
.student-sheet-card h2 { margin: 16px 0 8px; font-size: 21px; letter-spacing: -.03em; }
.student-sheet-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.sheet-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.sheet-arrow { color: var(--brand); font-size: 22px; }
.sheet-progress-row { margin-top: auto; padding-top: 24px; display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; font-weight: 700; }
.sheet-progress-row strong { color: var(--text); }
.sheet-empty { grid-column: 1 / -1; }

.sheet-admin-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.sheet-admin-card { padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.sheet-admin-card h3, .access-sheet-card h2 { margin: 10px 0 0; font-size: 19px; letter-spacing: -.025em; }
.sheet-admin-card > p { min-height: 42px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.sheet-card-stats { margin-top: 18px; display: flex; gap: 10px; }
.sheet-card-stats span { padding: 9px 10px; border-radius: 10px; background: #f9fafb; color: var(--muted); font-size: 10px; }
.sheet-card-stats strong { color: var(--text); }
.sheet-create-grid { margin-top: 20px; }
.admin-search-controls { grid-template-columns: minmax(240px, 520px); margin-bottom: 14px; }
.admin-url { margin-top: 8px; }

.access-management-grid { margin-top: 30px; display: grid; gap: 16px; }
.access-sheet-card { padding: 22px; border: 1px solid var(--line); border-radius: 17px; background: #fff; }
.text-link { color: var(--brand); font-size: 11px; font-weight: 800; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.grant-access-form { margin-top: 20px; max-width: 760px; }
.access-list { margin-top: 16px; display: grid; gap: 8px; }
.access-row { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px; background: #f9fafb; font-size: 12px; }
.btn-small { padding: 7px 10px; font-size: 10px; }
.access-chip-row { display: flex; flex-wrap: wrap; gap: 7px; }
.email-chip { padding: 7px 9px; color: #344054; background: #f2f4f7; }
.access-inline-card { padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }

@media (max-width: 1100px) {
  .student-sheet-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sheet-checkbox-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .student-sheet-grid, .sheet-admin-grid, .admin-form-grid, .sheet-checkbox-grid { grid-template-columns: 1fr; }
  .span-2 { grid-column: auto; }
  .admin-row-actions { justify-content: flex-start; }
  .sheet-card-stats { flex-wrap: wrap; }
}

/* Platform/rating filters + bulk sheet access */
.filter-row.four-col { display: grid; grid-template-columns: repeat(4, minmax(145px, 1fr)); }
.filter-row.five-col { display: grid; grid-template-columns: repeat(5, minmax(135px, 1fr)); }
.admin-filter-controls { grid-template-columns: minmax(280px, 1fr); align-items: stretch; }
.admin-filter-count { margin: -4px 0 12px; font-size: 12px; }

.grant-access-form textarea {
  width: 100%; resize: vertical; min-height: 118px; border: 1px solid #d0d5dd; border-radius: 12px;
  background: #fff; color: var(--text); outline: none; padding: 11px 12px; font: inherit; line-height: 1.55;
}
.grant-access-form textarea:focus { border-color: #818cf8; box-shadow: 0 0 0 4px rgba(99,102,241,.12); }
.grant-access-form label span em { color: var(--muted); font-style: normal; font-weight: 500; }
.bulk-access-actions { margin-top: 10px; display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.bulk-access-actions .muted { font-size: 11px; }
.bulk-access-result { min-height: 18px; margin-top: 9px; font-size: 11px; font-weight: 700; }
.bulk-access-result[data-type='success'] { color: #067647; }
.bulk-access-result[data-type='warning'] { color: #b54708; }
.bulk-access-result[data-type='error'] { color: #b42318; }

@media (max-width: 1150px) {
  .filter-row.five-col { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .filter-row.four-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .filter-row.five-col, .filter-row.four-col { grid-template-columns: 1fr; }
  .bulk-access-actions { align-items: stretch; flex-direction: column; }
  .bulk-access-actions .btn { width: 100%; }
}

/* Admin platform-aware question filters */
.admin-question-row.is-filtered-out { display: none !important; }
.admin-filter-empty[hidden] { display: none !important; }
.conditional-filter.is-hidden { display: none !important; }
.filter-field {
  display: grid;
  gap: 6px;
  min-width: 0;
  color: #344054;
  font-size: 11px;
  font-weight: 800;
}
.filter-field select {
  width: 100%;
  min-height: 42px;
}
.filter-clear-button { align-self: end; min-height: 42px; }
.filter-spacer { min-height: 1px; }
@media (max-width: 1150px) {
  .admin-platform-filter-row .filter-spacer { display: none; }
}