:root {
  color-scheme: light;
  --bg: #f6f8f7;
  --surface: #ffffff;
  --surface-soft: #eef8f5;
  --text: #14211f;
  --muted: #60706c;
  --line: #dce6e3;
  --primary: #0f8f75;
  --primary-dark: #08715d;
  --accent: #2563eb;
  --warning: #b7791f;
  --danger: #c2410c;
  --success: #10865f;
  --shadow: 0 18px 40px rgba(19, 45, 39, 0.09);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Segoe UI",
    Arial,
    sans-serif;
  line-height: 1.5;
}

#app:focus {
  outline: none;
}

.site-footer {
  padding: 22px 16px 28px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.site-footer a:hover {
  color: var(--primary);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 12px clamp(16px, 4vw, 48px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--primary);
  color: white;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 4px;
  overflow-x: auto;
}

.nav a {
  flex: 0 0 auto;
  padding: 9px 12px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
}

.nav a.active,
.nav a:hover {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.auth-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.primary-button,
.secondary-button,
.ghost-button,
.danger-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 700;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease;
}

.primary-button {
  background: var(--primary);
  color: white;
  box-shadow: 0 8px 20px rgba(15, 143, 117, 0.2);
}

.primary-button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.secondary-button {
  background: var(--surface);
  color: var(--primary-dark);
  border-color: var(--line);
}

.secondary-button:hover,
.ghost-button:hover {
  background: var(--surface-soft);
}

.ghost-button {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

.danger-button {
  background: #fff0e8;
  border-color: rgba(194, 65, 12, 0.28);
  color: var(--danger);
}

.danger-button:hover,
.danger-action:hover {
  background: #ffe3d6;
}

.danger-action {
  min-height: 32px;
  padding: 0 10px;
  color: var(--danger);
}

.wide {
  width: 100%;
}

.home-route {
  background:
    radial-gradient(circle at 12% 20%, rgba(180, 244, 216, 0.58), transparent 34%),
    radial-gradient(circle at 88% 68%, rgba(209, 250, 229, 0.72), transparent 38%),
    linear-gradient(135deg, #ffffff 0%, #f8fffc 46%, #eaf9f1 100%);
}

.home-route .topbar {
  background: rgba(255, 255, 255, 0.78);
  border-bottom-color: rgba(15, 143, 117, 0.12);
  backdrop-filter: blur(12px);
}

.home-route .brand,
.home-route .brand small,
.home-route .nav a,
.home-route .ghost-button {
  color: var(--muted);
}

.home-route .brand strong {
  color: var(--text);
}

.home-route .brand-mark {
  background: var(--primary);
  color: white;
}

.home-route .nav a.active,
.home-route .nav a:hover,
.home-route .ghost-button:hover {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.home-route .ghost-button {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(15, 143, 117, 0.18);
  color: var(--text);
}

.dashboard-band {
  background:
    radial-gradient(circle at top left, rgba(15, 143, 117, 0.14), transparent 34%),
    linear-gradient(135deg, #f7fbfa 0%, #edf7f5 100%);
  border-bottom: 1px solid var(--line);
}

.dashboard,
.content-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.dashboard {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 32px;
  align-items: center;
  min-height: 430px;
  padding: 56px 0;
}

.intro-panel h1,
.content-shell h1,
.content-shell h2 {
  margin: 0;
  line-height: 1.16;
}

.intro-panel h1 {
  max-width: 640px;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 850;
}

.lead {
  max-width: 700px;
  color: var(--muted);
  font-size: 18px;
}

.lead.narrow {
  max-width: 560px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stat-grid article {
  padding: 22px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stat-grid span {
  display: block;
  color: var(--primary-dark);
  font-size: 34px;
  font-weight: 850;
}

.stat-grid strong,
.stat-grid small {
  display: block;
}

.stat-grid small {
  color: var(--muted);
}

.content-shell {
  padding: 34px 0;
}

.home-hero {
  display: flex;
  min-height: calc(100vh - 74px);
  color: var(--text);
  background:
    radial-gradient(circle at 14% 18%, rgba(187, 247, 208, 0.62), transparent 34%),
    radial-gradient(circle at 82% 70%, rgba(209, 250, 229, 0.76), transparent 38%),
    linear-gradient(135deg, #ffffff 0%, #fbfffd 48%, #eaf8f1 100%);
  border-bottom: 0;
}

.home-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 24px;
  align-items: stretch;
  padding-top: 44px;
  padding-bottom: 34px;
}

.home-hero-simple {
  display: flex;
  align-items: center;
  min-height: inherit;
  padding-top: 72px;
  padding-bottom: 84px;
}

.home-copy {
  align-self: center;
  max-width: 780px;
}

.home-copy h1 {
  margin: 0;
  color: var(--text);
  font-size: 56px;
  font-weight: 850;
  line-height: 1.08;
}

.home-copy .lead {
  margin: 16px 0 0;
  max-width: 680px;
  color: #43645c;
  font-size: 22px;
}

.home-hero .eyebrow {
  color: var(--primary-dark);
}

.home-hero .primary-button {
  background: var(--primary);
  color: white;
  box-shadow: 0 14px 34px rgba(15, 143, 117, 0.18);
}

.home-hero .primary-button:hover {
  background: var(--primary-dark);
}

.home-hero .secondary-button {
  background: rgba(255, 255, 255, 0.74);
  border-color: rgba(15, 143, 117, 0.18);
  color: var(--primary-dark);
}

.home-hero .secondary-button:hover {
  background: #eef8f5;
}

.home-entry-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.home-entry-list {
  display: grid;
  gap: 10px;
}

.home-entry-list a {
  display: grid;
  gap: 3px;
  padding: 12px;
  background: #f9fcfb;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    background 0.18s ease;
}

.home-entry-list a:hover {
  background: var(--surface-soft);
  border-color: rgba(15, 143, 117, 0.45);
  transform: translateY(-1px);
}

.home-entry-list strong,
.home-entry-list span {
  display: block;
}

.home-entry-list span {
  color: var(--muted);
  font-size: 13px;
}

.home-overview {
  padding-top: 24px;
  padding-bottom: 8px;
}

.home-stat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.home-stat-strip article {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.home-stat-strip span {
  display: block;
  color: var(--primary-dark);
  font-size: 30px;
  font-weight: 850;
  line-height: 1.1;
}

.home-stat-strip strong,
.home-stat-strip small {
  display: block;
}

.home-stat-strip small {
  color: var(--muted);
}

.home-workspace {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 18px;
  align-items: start;
}

.home-card {
  min-width: 0;
}

.quick-problems.home-problems {
  grid-template-columns: 1fr;
  gap: 10px;
}

.quick-problems.home-problems .problem-card {
  padding: 14px;
  box-shadow: none;
}

.quick-problems.home-problems .problem-card p {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.compact-table table {
  min-width: 620px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.section-head.compact {
  margin-bottom: 12px;
}

.section-head h1 {
  font-size: 34px;
}

.section-head h2,
.notice-panel h2 {
  font-size: 24px;
}

.text-link,
.back-link {
  color: var(--primary-dark);
  font-weight: 800;
}

.quick-problems,
.contest-grid,
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.problem-card,
.contest-card,
.team-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.problem-card:hover,
.team-card:hover,
.team-card.active {
  border-color: rgba(15, 143, 117, 0.45);
  transform: translateY(-1px);
}

.problem-card h3,
.contest-card h3,
.team-card h3 {
  margin: 0;
}

.problem-card p,
.contest-card p,
.team-card p,
.notice-panel p,
.help-text {
  margin: 0;
  color: var(--muted);
}

.meta-row,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.tag,
.difficulty,
.verdict,
.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.tag {
  background: #eef6ff;
  color: #1d4ed8;
}

.difficulty {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.difficulty.hard {
  background: #fff3e7;
  color: var(--danger);
}

.difficulty.medium {
  background: #fff8df;
  color: var(--warning);
}

.split-layout,
.admin-layout,
.team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 22px;
  align-items: start;
}

.notice-panel {
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.team-access-panel {
  max-width: 620px;
}

.team-access-form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.roadmap,
.check-list {
  margin: 16px 0 0;
  padding-left: 22px;
  color: var(--text);
}

.roadmap li,
.check-list li {
  margin: 8px 0;
}

.table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 860px;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

thead th {
  background: #f1f6f4;
  color: var(--muted);
  font-size: 13px;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.muted-text {
  color: var(--muted);
  font-size: 13px;
}

.rank-name,
.rank-name-cell {
  white-space: nowrap;
  word-break: keep-all;
}

.rank-name {
  display: inline-block;
  min-width: max-content;
}

.code-details summary {
  cursor: pointer;
  color: var(--primary-dark);
  font-weight: 800;
}

.submission-code {
  max-width: 520px;
  max-height: 220px;
  min-height: 0;
  margin-top: 10px;
  overflow: auto;
  white-space: pre;
}

.submission-status-link {
  display: inline-flex;
  text-decoration: none;
}

.submission-status-link:hover .verdict {
  filter: brightness(0.96);
  text-decoration: underline;
}

.submission-detail-shell {
  display: grid;
  gap: 18px;
}

.submission-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.submission-summary-grid article,
.submission-detail-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.submission-summary-grid span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

.submission-summary-grid strong {
  display: block;
  color: var(--text);
  word-break: break-word;
}

.submission-case-table {
  min-width: 680px;
}

.submission-detail-code {
  max-height: 560px;
  margin: 0;
  overflow: auto;
  white-space: pre;
}

.training-rank-wrap {
  overflow: auto;
}

.training-rank-table {
  table-layout: fixed;
}

.training-rank-table th,
.training-rank-table td {
  overflow: visible;
  white-space: nowrap;
}

.training-rank-table .rank-name {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  vertical-align: top;
}

.training-rank-table .verdict {
  max-width: 100%;
  white-space: nowrap;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 160px 180px;
  gap: 12px;
  margin-bottom: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  outline: none;
}

input,
select {
  height: 42px;
  padding: 0 12px;
}

textarea {
  min-height: 180px;
  padding: 12px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 143, 117, 0.13);
}

.problem-list {
  display: grid;
  gap: 10px;
}

.problem-group-heading {
  margin: 12px 0 2px;
  padding: 8px 12px;
  border-left: 4px solid var(--primary);
  border-radius: 6px;
  background: rgba(15, 143, 117, 0.08);
  color: var(--text);
  font-weight: 800;
}

.pagination-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

.pagination-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.page-button {
  display: inline-grid;
  place-items: center;
  min-width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.page-button.active {
  border-color: var(--primary);
  background: rgba(15, 143, 117, 0.1);
  color: var(--primary);
}

.pagination-ellipsis {
  padding: 0 4px;
  font-weight: 800;
}

.pagination-actions .disabled {
  opacity: 0.45;
  pointer-events: none;
}

.problem-row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) 100px 110px 90px;
  gap: 16px;
  align-items: center;
  padding: 15px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.problem-row:hover {
  border-color: rgba(15, 143, 117, 0.45);
  box-shadow: var(--shadow);
}

.problem-id {
  color: var(--muted);
  font-weight: 800;
}

.problem-title {
  min-width: 0;
}

.problem-title strong {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.problem-title small {
  color: var(--muted);
}

.detail-shell {
  padding-top: 24px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 16px;
}

.problem-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 22px;
  align-items: start;
}

.statement,
.submit-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.statement {
  padding: 28px;
}

.submit-panel {
  position: sticky;
  top: 86px;
  display: grid;
  gap: 14px;
  padding: 20px;
}

.account-note {
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 13px;
}

.account-note strong {
  color: var(--primary-dark);
}

.problem-title-row {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.problem-title-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.statement h1 {
  margin: 0;
  font-size: 32px;
}

.statement h2,
.submit-panel h2 {
  margin: 26px 0 10px;
  font-size: 20px;
}

.submit-panel h2 {
  margin-top: 0;
}

.statement p {
  margin: 0;
  color: #34433f;
}

.sample-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.sample-grid h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

pre {
  overflow-x: auto;
  min-height: 92px;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101817;
  color: #eafff7;
  font-family: Consolas, "Cascadia Mono", monospace;
  font-size: 14px;
  line-height: 1.45;
}

#codeInput {
  min-height: 260px;
  font-family: Consolas, "Cascadia Mono", monospace;
  font-size: 14px;
  line-height: 1.55;
  tab-size: 4;
}

#selfTestInput {
  min-height: 86px;
  font-family: Consolas, "Cascadia Mono", monospace;
}

.self-test-panel {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfc;
}

.self-test-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.self-test-head h3 {
  margin: 0;
  font-size: 16px;
}

.run-result {
  display: grid;
  gap: 8px;
  min-height: 76px;
  padding: 12px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--surface);
  font-size: 13px;
}

.run-result p {
  margin: 0;
}

.run-result pre {
  min-height: 0;
  max-height: 160px;
}

.self-test-status {
  width: fit-content;
  padding: 4px 8px;
  border-radius: 999px;
  font-weight: 800;
}

.submit-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.admin-form {
  display: grid;
  max-width: 680px;
  gap: 14px;
  margin-top: 20px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.admin-head {
  align-items: start;
}

.admin-console {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.admin-sidebar {
  position: sticky;
  top: 86px;
  display: grid;
  gap: 8px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.admin-sidebar button {
  width: 100%;
  min-height: 42px;
  padding: 0 12px;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
  text-align: left;
}

.admin-sidebar button.active,
.admin-sidebar button:hover {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.admin-main,
.admin-panel,
.problem-admin-form {
  display: grid;
  gap: 16px;
}

.admin-subtabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.admin-subtabs button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
}

.admin-subtabs button.active,
.admin-subtabs button:hover {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.problem-admin-list-panel,
.problem-form-head {
  display: grid;
  gap: 12px;
}

.problem-admin-search {
  display: grid;
  grid-template-columns: minmax(220px, 420px) auto;
  align-items: end;
  gap: 12px;
}

.problem-admin-search .help-text {
  margin: 0 0 10px;
  white-space: nowrap;
}

.problem-admin-list-panel[hidden],
.problem-import-panel[hidden],
.problem-admin-form[hidden] {
  display: none;
}

.problem-import-panel {
  display: grid;
  gap: 16px;
}

.problem-import-form {
  display: grid;
  gap: 12px;
}

.problem-import-form textarea {
  min-height: 320px;
  font-family: "Cascadia Code", Consolas, "Liberation Mono", monospace;
  line-height: 1.6;
}

.import-preview {
  display: grid;
  gap: 12px;
  color: var(--muted);
}

.import-errors {
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
  background: #fff7f7;
  color: #991b1b;
}

.import-errors p {
  margin: 0;
}

.problem-form-head {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
}

.problem-form-head h3 {
  margin: 0;
  font-size: 20px;
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.form-section {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfc;
}

.form-section h3 {
  margin: 0;
  font-size: 18px;
}

.problem-form-grid,
.sample-editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.problem-form-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.problem-admin-form textarea {
  min-height: 116px;
}

.markdown-editor-list {
  display: grid;
  gap: 16px;
}

.markdown-editor {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.markdown-editor-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.markdown-editor-head h4 {
  margin: 0;
  color: var(--text);
  font-size: 16px;
}

.markdown-editor-head span,
.markdown-preview-panel > span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.markdown-refresh-button {
  margin-left: auto;
  padding: 6px 10px;
  min-height: 30px;
}

.markdown-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
  align-items: stretch;
}

.markdown-write textarea {
  min-height: 240px;
  font-family: "Cascadia Code", Consolas, "Liberation Mono", monospace;
  line-height: 1.6;
}

.markdown-preview-panel {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.markdown-preview {
  min-height: 240px;
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfc;
}

.markdown-body {
  color: var(--text);
  font-size: 15px;
  line-height: 1.75;
}

.markdown-body > *:first-child {
  margin-top: 0;
}

.markdown-body > *:last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin: 14px 0 8px;
  line-height: 1.35;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body pre,
.markdown-table-wrap {
  margin: 0 0 12px;
}

.markdown-table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

.markdown-body table {
  width: auto;
  min-width: 420px;
  border-collapse: collapse;
  background: var(--surface);
}

.markdown-body th,
.markdown-body td {
  padding: 8px 12px;
  border: 1px solid var(--line);
  white-space: nowrap;
  text-align: center;
}

.markdown-body th {
  background: #eef8f2;
  font-weight: 800;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 22px;
}

.markdown-body blockquote {
  padding-left: 12px;
  border-left: 4px solid var(--line);
  color: var(--muted);
}

.markdown-body code {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--surface-soft);
  font-family: "Cascadia Code", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.markdown-body pre {
  min-height: 0;
  padding: 12px;
  overflow: auto;
  background: #101817;
  color: #e8f5f1;
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.markdown-body a {
  color: var(--primary-dark);
  text-decoration: underline;
}

.math-inline {
  display: inline-block;
  padding: 0 2px;
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: 1.06em;
  line-height: 1;
}

.math-block {
  margin: 12px 0;
  padding: 10px 12px;
  overflow-x: auto;
  border-radius: var(--radius);
  background: var(--surface-soft);
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: 18px;
  text-align: center;
}

.math-frac {
  display: inline-grid;
  grid-template-rows: auto auto;
  align-items: center;
  margin: 0 2px;
  vertical-align: middle;
  text-align: center;
  line-height: 1.1;
}

.math-frac span:first-child {
  padding: 0 4px 2px;
  border-bottom: 1px solid currentColor;
}

.math-frac span:last-child {
  padding: 2px 4px 0;
}

.markdown-empty {
  color: var(--muted);
}

.radio-row,
.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.option-line {
  display: inline-flex;
  grid-template-columns: none;
  align-items: center;
  gap: 8px;
  width: fit-content;
  color: var(--text);
  font-weight: 700;
}

.option-line input {
  width: auto;
  height: auto;
  padding: 0;
}

.judge-case-list {
  display: grid;
  gap: 12px;
}

.sample-editor-list {
  display: grid;
  gap: 12px;
}

.sample-case {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.sample-case-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.judge-case {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 120px;
  gap: 12px;
  align-items: end;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.judge-case-head {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.judge-case textarea {
  min-height: 92px;
}

.file-preview {
  padding: 12px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--surface);
  font-size: 13px;
}

.sample-stack {
  display: grid;
  gap: 14px;
}

.judge-info-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.judge-info-list li {
  padding: 7px 10px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 800;
}

.admin-panel[hidden] {
  display: none;
}

.admin-panel .admin-form,
.admin-team-panel,
.admin-student-panel,
.admin-teacher-panel,
.admin-training-panel,
.admin-contest-panel {
  max-width: none;
  margin-top: 0;
}

.admin-team-form,
.admin-student-form {
  grid-template-columns: minmax(220px, 1fr) minmax(180px, 0.7fr) minmax(180px, 0.8fr) auto;
  align-items: end;
  margin-top: 0;
}

.admin-teacher-form {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(160px, 0.8fr) minmax(180px, 1fr) minmax(140px, 0.7fr) auto;
  gap: 12px;
  align-items: end;
  margin-top: 0;
}

.admin-training-panel {
  max-width: none;
}

.teacher-training-form,
.admin-contest-form {
  display: grid;
  grid-template-columns: minmax(180px, 0.8fr) minmax(220px, 1fr) minmax(160px, 0.7fr) auto;
  gap: 12px;
  align-items: end;
}

.admin-contest-form {
  grid-template-columns: repeat(4, minmax(160px, 1fr));
}

.checkbox-field {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding-bottom: 2px;
  font-weight: 800;
  color: var(--text);
}

.checkbox-field input {
  width: 18px;
  height: 18px;
}

.admin-contest-form .wide-field {
  grid-column: span 2;
}

.contest-admin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.contest-admin-grid .manage-panel {
  min-width: 0;
}

.contest-admin-grid .table-wrap {
  overflow-x: auto;
}

.contest-problem-form {
  display: grid;
  grid-template-columns: minmax(180px, 0.6fr) minmax(220px, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.contest-password-form {
  display: grid;
  grid-template-columns: minmax(220px, 360px) auto;
  gap: 12px;
  align-items: end;
  margin-top: 16px;
}

.team-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 18px;
}

.team-submission-panel {
  display: grid;
  gap: 14px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.team-submission-panel .table-wrap {
  box-shadow: none;
}

.team-detail,
.team-summary,
.team-section,
.add-member-panel,
.add-training-panel {
  display: grid;
  gap: 16px;
}

.team-summary,
.team-section {
  margin-bottom: 18px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.team-summary {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.8fr);
  align-items: center;
}

.team-summary p,
.notice-item p,
.training-detail-head p,
.training-item p,
.empty-text {
  margin: 0;
  color: var(--muted);
}

.team-tabs-shell {
  margin-bottom: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.team-tabs,
.inner-tabs,
.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.team-tabs {
  padding: 12px;
  border-bottom: 1px solid var(--line);
}

.team-tabs a,
.inner-tabs a,
.segmented span {
  padding: 8px 12px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.team-tabs a.active,
.team-tabs a:hover,
.inner-tabs a.active,
.inner-tabs a:hover,
.segmented span.active {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.team-tab-panel {
  padding: 18px;
}

.team-tab-panel .team-section {
  margin-bottom: 14px;
  box-shadow: none;
}

.notice-list {
  display: grid;
  gap: 12px;
}

.notice-item {
  display: grid;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfc;
}

.notice-item h3 {
  margin: 0 0 2px;
}

.notice-item small {
  color: var(--muted);
}

.compact-toolbar {
  grid-template-columns: minmax(220px, 360px);
}

.submission-toolbar {
  grid-template-columns: repeat(4, minmax(160px, 1fr));
}

.training-detail-section {
  gap: 18px;
}

.training-detail-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 18px;
  align-items: center;
}

.training-detail-head h2 {
  margin-bottom: 6px;
}

.inner-tabs {
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}

.training-manage {
  display: grid;
  gap: 14px;
}

.manage-panel,
.danger-zone {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfc;
}

.danger-zone {
  border-color: rgba(194, 65, 12, 0.24);
  background: #fffaf7;
}

.manage-panel h3,
.danger-zone h3 {
  margin: 0;
}

.danger-zone p {
  margin: 0;
  color: var(--muted);
}

.training-problem-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.training-picker-controls {
  display: grid;
  grid-template-columns: minmax(160px, 0.7fr) minmax(140px, 0.55fr) minmax(220px, 1fr);
  gap: 12px;
}

.training-picker-summary {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.training-candidate-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 10px;
  max-height: 520px;
  overflow: auto;
  padding-right: 4px;
}

.training-candidate {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.training-candidate[hidden] {
  display: none;
}

.training-candidate strong {
  display: block;
  margin-bottom: 6px;
}

.training-candidate p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.mini-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.mini-stat-grid.large {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mini-stat-grid span {
  padding: 10px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 13px;
}

.mini-stat-grid strong {
  display: block;
  color: var(--primary-dark);
  font-size: 22px;
}

.training-list {
  display: grid;
  gap: 10px;
}

.training-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  gap: 16px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfc;
}

.training-item h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

.progress-block {
  display: grid;
  gap: 8px;
  color: var(--primary-dark);
  font-weight: 800;
}

.progress-bar {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #dfe9e6;
}

.progress-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
}

.team-form,
.member-form,
.training-form {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.member-form,
.training-form {
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  align-items: end;
  margin-top: 0;
}

.verdict.ac,
.status-pill.live {
  background: #e9f8ef;
  color: var(--success);
}

.status-pill.locked {
  background: #fff0e8;
  color: var(--danger);
}

.verdict.wa {
  background: #fff0e8;
  color: var(--danger);
}

.verdict.pac {
  background: #ecfdf3;
  color: #0f766e;
}

.verdict.pending,
.status-pill.soon {
  background: #fff8df;
  color: var(--warning);
}

.status-pill.done {
  background: #eef2f7;
  color: var(--muted);
}

.verdict.ce {
  background: #eef6ff;
  color: #1d4ed8;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 20;
  max-width: min(420px, calc(100% - 40px));
  padding: 14px 16px;
  border-radius: var(--radius);
  background: #10231f;
  color: white;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(20, 33, 31, 0.35);
}

.modal-backdrop[hidden] {
  display: none;
}

.login-card {
  display: grid;
  width: min(420px, 100%);
  gap: 14px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.login-card h2 {
  margin: 0 0 6px;
  font-size: 24px;
}

@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr;
  }

  .brand {
    min-width: 0;
  }

  .nav {
    justify-content: start;
  }

  .ghost-button {
    justify-self: start;
  }

  .auth-actions {
    justify-self: start;
    justify-content: start;
  }

  .dashboard,
  .split-layout,
  .admin-layout,
  .admin-console,
  .team-layout,
  .problem-layout,
  .team-summary,
  .training-detail-head,
  .member-form,
  .training-form,
  .training-problem-form,
  .training-picker-controls,
  .admin-team-form,
  .admin-student-form,
  .admin-teacher-form,
  .problem-form-head,
  .problem-admin-search,
  .problem-form-grid,
  .sample-editor-grid,
  .markdown-split,
  .judge-case,
  .teacher-training-form,
  .admin-contest-form,
  .contest-admin-grid,
  .contest-problem-form,
  .contest-password-form,
  .submit-actions {
    grid-template-columns: 1fr;
  }

  .admin-contest-form .wide-field {
    grid-column: auto;
  }

  .admin-sidebar {
    position: static;
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .admin-sidebar button {
    text-align: center;
  }

  .submit-panel {
    position: static;
  }

  .quick-problems,
  .contest-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .dashboard,
  .content-shell {
    width: min(100% - 24px, 1180px);
  }

  .dashboard {
    min-height: 0;
    padding: 36px 0;
  }

  .intro-panel h1 {
    font-size: 31px;
  }

  .lead {
    font-size: 16px;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .stat-grid,
  .quick-problems,
  .contest-grid,
  .team-grid,
  .sample-grid,
  .submission-summary-grid,
  .toolbar,
  .submission-toolbar,
  .compact-toolbar,
  .admin-contest-form,
  .contest-problem-form,
  .contest-password-form {
    grid-template-columns: 1fr;
  }

  .admin-contest-form .wide-field {
    grid-column: auto;
  }

  .admin-sidebar {
    grid-template-columns: 1fr;
  }

  .mini-stat-grid,
  .mini-stat-grid.large,
  .training-item {
    grid-template-columns: 1fr;
  }

  .problem-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .pagination-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .pagination-actions {
    justify-content: flex-start;
  }

  .problem-title strong {
    white-space: normal;
  }

  .statement,
  .submit-panel,
  .admin-form,
  .notice-panel {
    padding: 16px;
  }
}

@media (max-width: 980px) {
  .home-hero-grid,
  .home-workspace {
    grid-template-columns: 1fr;
  }

  .home-stat-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .home-hero {
    min-height: calc(100vh - 132px);
  }

  .home-hero-simple {
    padding-top: 48px;
    padding-bottom: 56px;
  }

  .home-hero-grid {
    padding-top: 26px;
    padding-bottom: 22px;
  }

  .home-copy h1 {
    font-size: 34px;
  }

  .home-copy .lead {
    font-size: 18px;
  }

  .home-entry-panel {
    padding: 16px;
  }

  .home-stat-strip {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 540px) and (max-width: 980px) {
  .home-entry-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 539px) {
  .home-entry-list {
    grid-template-columns: 1fr;
  }
}