/* Global CPE OJ design system. */
:root {
  --oj-bg: #f7f8fa;
  --oj-panel: #ffffff;
  --oj-border: #e5e7eb;
  --oj-muted: #6b7280;
  --oj-text: #1f2937;
  --oj-accent: #00b8a3;
  --oj-accent-dark: #009884;
  --oj-soft-accent: #e6fffb;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  background: var(--oj-bg);
  color: var(--oj-text);
  font-size: 14px;
  overflow-x: hidden;
}

a {
  color: #2563eb;
}

a:hover {
  color: #1d4ed8;
}

.oj-navbar {
  height: 56px;
  box-shadow: 0 1px 0 rgba(31, 41, 55, 0.06);
}

.navbar-brand {
  letter-spacing: 0;
}

.nav-link {
  color: #4b5563;
  font-weight: 500;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--oj-text);
}

.oj-page {
  max-width: 1180px;
}

.oj-panel {
  background: var(--oj-panel);
  border: 1px solid var(--oj-border);
  border-radius: 8px;
  min-width: 0;
}

.oj-auth-shell {
  min-height: calc(100vh - 112px);
  display: grid;
  justify-items: center;
  align-items: start;
  padding: 28px 0 24px;
}

.oj-auth-card {
  width: min(460px, 100%);
  padding: 28px 32px;
}

.oj-auth-title {
  font-size: 24px;
  font-weight: 650;
  margin-bottom: 6px;
}

.oj-auth-subtitle {
  color: var(--oj-muted);
  margin-bottom: 24px;
}

.form-label {
  color: #374151;
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-text {
  color: var(--oj-muted);
  font-size: 12px;
  line-height: 1.45;
  margin-top: 6px;
}

.form-text ul {
  margin: 0;
  padding-left: 16px;
}

.oj-combobox {
  position: relative;
}

.oj-combobox-menu {
  background: #fff;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  box-shadow: 0 10px 18px rgba(31, 41, 55, 0.12);
  display: none;
  left: 0;
  max-height: 220px;
  overflow-y: auto;
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  z-index: 1000;
}

.oj-combobox.open .oj-combobox-menu {
  display: block;
}

.oj-combobox-option {
  cursor: pointer;
  padding: 8px 12px;
}

.oj-combobox-option:hover,
.oj-combobox-option.active {
  background: #f3f4f6;
}

.oj-combobox-empty {
  color: var(--oj-muted);
  padding: 8px 12px;
}

.oj-auth-card .mb-3 {
  margin-bottom: 14px !important;
}

input[type="text"],
input:not([type]),
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="url"],
textarea,
select {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  color: var(--oj-text);
  padding: 9px 12px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus,
input:not([type]):focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
input[type="url"]:focus,
textarea:focus,
select:focus {
  border-color: var(--oj-accent);
  box-shadow: 0 0 0 3px rgba(0, 184, 163, 0.16);
  outline: none;
}

.btn-primary {
  --bs-btn-bg: var(--oj-accent);
  --bs-btn-border-color: var(--oj-accent);
  --bs-btn-hover-bg: var(--oj-accent-dark);
  --bs-btn-hover-border-color: var(--oj-accent-dark);
  --bs-btn-active-bg: var(--oj-accent-dark);
  --bs-btn-active-border-color: var(--oj-accent-dark);
  font-weight: 600;
}

.oj-table {
  --bs-table-hover-bg: #f9fafb;
  font-size: 14px;
}

.oj-table thead th {
  background: #fafafa;
  color: #6b7280;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  padding: 12px 18px;
  text-transform: uppercase;
}

.oj-table tbody td {
  border-color: #f0f1f3;
  padding: 16px 18px;
}

.oj-table th,
.oj-table td {
  vertical-align: middle;
}

.oj-table td {
  overflow-wrap: anywhere;
}

.oj-table-scroll {
  max-height: 560px;
  overflow: auto;
}

.oj-table-scroll-sm {
  max-height: 320px;
}

.oj-table-scroll-lg {
  max-height: 640px;
}

.oj-table-scroll .oj-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
}

.oj-table-actions {
  white-space: nowrap;
  width: 1%;
}

.oj-table-actions > .btn,
.oj-table-actions > form {
  margin-left: 6px;
}

.oj-badge {
  display: inline-flex;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 650;
  padding: 5px 10px;
  white-space: nowrap;
}

.oj-badge-easy {
  background: var(--oj-soft-accent);
  color: #008673;
}

.oj-badge-difficulty-easy {
  background: #dcfce7;
  color: #15803d;
}

.oj-badge-difficulty-medium {
  background: #fef3c7;
  color: #92400e;
}

.oj-badge-difficulty-hard {
  background: #fee2e2;
  color: #b91c1c;
}

.oj-badge-neutral {
  background: #f3f4f6;
  color: #4b5563;
}

.oj-badge-danger {
  background: #fee2e2;
  color: #b91c1c;
}

.oj-badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.oj-tag-list {
  align-items: flex-start;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 180px;
}

.oj-table .oj-tag-list {
  max-width: 280px;
}

.oj-section-title {
  color: #111827;
  font-size: 18px;
  font-weight: 650;
  margin-bottom: 12px;
}

.oj-pre {
  background: #f7f8fa;
  border: 1px solid var(--oj-border);
  border-radius: 6px;
  color: #374151;
  font-size: 13px;
  margin: 0;
  padding: 14px;
  white-space: pre-wrap;
}

.oj-code-pre {
  overflow-x: auto;
  white-space: pre;
}

.oj-rich-content {
  color: #374151;
  line-height: 1.75;
  overflow-wrap: anywhere;
}

.oj-rich-content > :last-child {
  margin-bottom: 0;
}

.oj-rich-content img {
  border-radius: 6px;
  display: block;
  height: auto;
  margin: 16px 0;
  max-width: 100%;
}

.oj-rich-content table {
  border-collapse: collapse;
  display: block;
  margin: 16px 0;
  max-width: 100%;
  overflow-x: auto;
  width: max-content;
}

.oj-rich-content th,
.oj-rich-content td {
  border: 1px solid var(--oj-border);
  padding: 8px 10px;
}

.oj-rich-content th {
  background: #f9fafb;
  color: #111827;
  font-weight: 650;
}

.oj-rich-content code {
  background: #f3f4f6;
  border-radius: 4px;
  color: #111827;
  font-size: 0.92em;
  padding: 2px 4px;
}

.oj-rich-content pre {
  background: #f7f8fa;
  border: 1px solid var(--oj-border);
  border-radius: 6px;
  overflow-x: auto;
  padding: 14px;
}

.oj-rich-content pre code {
  background: transparent;
  border-radius: 0;
  padding: 0;
}

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

.oj-image-item {
  align-items: center;
  border: 1px solid var(--oj-border);
  border-radius: 8px;
  display: grid;
  gap: 14px;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  padding: 12px;
}

.oj-image-item img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--oj-border);
  border-radius: 6px;
  height: auto;
  object-fit: contain;
  width: 96px;
}

.oj-image-meta {
  min-width: 0;
}

.oj-tabs .nav-link {
  color: var(--oj-muted);
  font-weight: 600;
}

.oj-tabs .nav-link.active {
  color: var(--oj-text);
}

.oj-stat {
  min-height: 96px;
}

.oj-form-grid {
  display: grid;
  gap: 16px;
}

.oj-form-grid .form-check input {
  width: auto;
}

.oj-compact-list {
  display: grid;
  gap: 0;
}

.oj-compact-list-item {
  border-bottom: 1px solid #f0f1f3;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  min-width: 0;
  padding: 10px 0;
}

.oj-compact-list-item:last-child {
  border-bottom: 0;
}

.oj-compact-list-main {
  min-width: 0;
}

.oj-compact-list-title {
  color: #111827;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.oj-submission-link {
  color: inherit;
  text-decoration: none;
}

.oj-submission-link:hover {
  color: inherit;
}

.oj-performance-stack {
  display: grid;
  gap: 18px;
}

.oj-performance-progress {
  background: #eef2f7;
  height: 8px;
}

.oj-performance-progress .progress-bar {
  background: var(--oj-accent);
}

.oj-panel-title-link {
  color: #2563eb;
  text-decoration: none;
}

.oj-panel-title-link:hover {
  color: #1d4ed8;
  text-decoration: underline;
}

.oj-problem-user-panels {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.oj-submission-detail-row > td {
  background: #fbfbfc;
  border-bottom: 1px solid #f0f1f3;
}

.oj-submission-inline-detail {
  padding: 18px;
}

.oj-submission-inline-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
}

.oj-submission-inline-heading {
  color: #111827;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.oj-inline-toggle {
  font-size: 12px;
  font-weight: 650;
  margin-left: -8px;
  padding-bottom: 0;
  padding-top: 2px;
  text-decoration: none;
}

.oj-badge-button {
  border: 0;
  cursor: pointer;
}

.oj-badge-button:hover,
.oj-badge-button:focus {
  background: #e5e7eb;
  color: #111827;
}

.oj-solved-grid {
  display: grid;
  gap: 10px;
}

.oj-solved-item {
  align-items: center;
  border: 1px solid var(--oj-border);
  border-radius: 8px;
  color: inherit;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr) auto;
  padding: 12px 14px;
  text-decoration: none;
}

.oj-solved-item:hover {
  background: #fafafa;
  color: inherit;
}

.oj-solved-main {
  min-width: 0;
}

.oj-solved-title {
  color: #111827;
  font-weight: 650;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.oj-solved-metrics {
  color: var(--oj-muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 13px;
  gap: 8px;
  justify-content: flex-end;
  white-space: nowrap;
}

.oj-danger-zone {
  border-color: #fecaca;
}

.oj-filter-actions {
  align-self: end;
  display: flex;
  gap: 8px;
}

.oj-filter-actions .btn {
  min-height: 42px;
}

.oj-manage-layout {
  display: flex;
  gap: 24px;
}

.oj-manage-sidebar {
  align-self: flex-start;
  flex: 0 0 220px;
}

.oj-manage-content {
  flex: 1 1 auto;
  min-width: 0;
}

.oj-page-heading {
  align-items: flex-end;
  display: flex;
  gap: 16px;
  justify-content: space-between;
}

.oj-problem-detail-shell {
  align-items: flex-start;
}

.oj-problem-detail-main,
.oj-problem-detail-side {
  min-width: 0;
}

.oj-problem-title {
  line-height: 1.18;
  overflow-wrap: anywhere;
}

.oj-problem-tabs {
  flex-wrap: nowrap;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
}

.oj-problem-tabs .nav-link {
  white-space: nowrap;
}

.oj-submission-source textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.55;
  min-height: 300px;
  overflow: auto;
  resize: vertical;
  tab-size: 4;
  white-space: pre;
}

.oj-home-shell {
  display: grid;
  gap: 28px;
}

.oj-home-hero {
  align-items: stretch;
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
  padding: 32px;
}

.oj-home-title {
  color: #111827;
  font-size: 48px;
  font-weight: 750;
  letter-spacing: 0;
  line-height: 1.06;
  margin-bottom: 16px;
}

.oj-home-kicker {
  color: var(--oj-accent-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 10px;
}

.oj-home-copy {
  color: #4b5563;
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 22px;
  max-width: 640px;
}

.oj-home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.oj-practice-panel {
  background: #111827;
  border-radius: 8px;
  color: #f9fafb;
  padding: 22px;
}

.oj-practice-panel .form-label,
.oj-practice-panel .text-muted {
  color: #d1d5db !important;
}

.oj-segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.oj-segmented button {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 6px;
  color: #f9fafb;
  font-weight: 600;
  padding: 8px 12px;
}

.oj-segmented button:hover,
.oj-segmented button:focus {
  border-color: var(--oj-accent);
  color: #f9fafb;
}

.oj-segmented button.active {
  background: var(--oj-accent);
  border-color: var(--oj-accent);
  color: #062c28;
}

.oj-practice-note {
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 0;
}

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

.oj-home-stat {
  background: #f9fafb;
  border: 1px solid var(--oj-border);
  border-radius: 8px;
  padding: 16px;
}

.oj-home-stat strong {
  color: #111827;
  display: block;
  font-size: 24px;
  line-height: 1.1;
}

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

.oj-problem-card {
  color: inherit;
  min-height: 148px;
  padding: 16px;
  text-decoration: none;
}

.oj-problem-card:hover {
  border-color: rgba(0, 184, 163, 0.45);
  box-shadow: 0 10px 24px rgba(31, 41, 55, 0.08);
  color: inherit;
}

.oj-problem-card-title {
  color: #111827;
  font-size: 16px;
  font-weight: 650;
  line-height: 1.35;
}

.form-check {
  align-items: center;
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  min-height: 24px;
  padding-left: 0;
}

.form-check input[type="checkbox"] {
  flex: 0 0 auto;
  height: 16px;
  margin: 0;
  width: 16px;
}

.form-check .form-check-label {
  color: #374151;
  font-size: 13px;
  font-weight: 600;
  margin: 0;
}

@media (max-width: 767.98px) {
  .oj-navbar {
    height: auto;
  }

  .oj-page {
    max-width: 100%;
  }

  .oj-auth-card {
    padding: 24px;
  }

  .oj-table thead th,
  .oj-table tbody td {
    padding: 12px;
  }

  .oj-home-hero,
  .oj-home-stat-grid,
  .oj-problem-grid {
    grid-template-columns: 1fr;
  }

  .oj-home-hero {
    padding: 22px;
  }

  .oj-home-title {
    font-size: 34px;
  }

  .oj-page-heading {
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
  }

  .oj-page-heading .btn {
    width: 100%;
  }

  .oj-filter-actions {
    width: 100%;
  }

  .oj-filter-actions .btn {
    flex: 1 1 0;
  }

  .oj-manage-layout {
    flex-direction: column;
    gap: 16px;
  }

  .oj-manage-sidebar {
    align-self: stretch;
    flex-basis: auto;
    overflow-x: auto;
  }

  .oj-manage-sidebar .nav {
    flex-direction: row !important;
    gap: 16px;
    min-width: max-content;
  }

  .oj-problem-tabs {
    margin-left: -24px;
    margin-right: -24px;
    padding-left: 24px;
    padding-right: 24px;
  }

  .oj-problem-detail-shell {
    display: block;
    margin-left: 0;
    margin-right: 0;
  }

  .oj-problem-detail-main,
  .oj-problem-detail-side {
    padding-left: 0;
    padding-right: 0;
    width: 100%;
  }

  .oj-problem-detail-side {
    margin-top: 24px;
  }

  .oj-problem-detail-shell .oj-panel {
    max-width: calc(100vw - 24px);
    width: calc(100vw - 24px);
  }

  .oj-problem-title {
    font-size: 24px;
    max-width: calc(100vw - 72px);
    word-break: break-word;
  }

  .oj-submission-source textarea {
    min-height: 240px;
  }

  .oj-table-scroll {
    max-height: 480px;
  }

  .oj-table-scroll-sm {
    max-height: 280px;
  }

  .oj-compact-list-item {
    align-items: flex-start;
  }

  .oj-problem-user-panels,
  .oj-submission-inline-grid {
    grid-template-columns: 1fr;
  }

  .oj-image-item {
    align-items: stretch;
    grid-template-columns: 1fr;
  }

  .oj-image-item img {
    width: 100%;
  }

  .oj-solved-item {
    align-items: start;
    grid-template-columns: 1fr;
  }

  .oj-solved-metrics {
    justify-content: flex-start;
  }
}

@media (min-width: 768px) and (max-width: 991.98px) {
  .oj-home-hero {
    grid-template-columns: 1fr;
  }

  .oj-problem-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .oj-manage-layout {
    flex-direction: column;
  }

  .oj-manage-sidebar {
    align-self: stretch;
    flex-basis: auto;
  }
}

/* Modernized global UI layer. */
:root {
  --oj-bg: #f4f6f8;
  --oj-panel: #ffffff;
  --oj-panel-muted: #f8fafc;
  --oj-border: #dfe5ec;
  --oj-border-strong: #cbd5e1;
  --oj-muted: #64748b;
  --oj-text: #162033;
  --oj-heading: #0f172a;
  --oj-accent: #0891b2;
  --oj-accent-dark: #0e7490;
  --oj-accent-ink: #ecfeff;
  --oj-soft-accent: #e0f7fb;
  --oj-success: #168a4a;
  --oj-warning: #b7791f;
  --oj-danger: #c2413c;
  --oj-radius: 8px;
  --oj-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --oj-shadow-md: 0 16px 36px rgba(15, 23, 42, 0.10);
}

html {
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at top left, rgba(8, 145, 178, 0.08), transparent 32rem),
    linear-gradient(180deg, #f8fafc 0%, var(--oj-bg) 38rem);
  color: var(--oj-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100%;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--oj-heading);
  letter-spacing: 0;
}

a {
  color: #0369a1;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.oj-navbar {
  backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.88) !important;
  border-bottom: 1px solid rgba(203, 213, 225, 0.78);
  box-shadow: none;
  min-height: 60px;
}

.navbar-brand {
  color: var(--oj-heading);
  font-weight: 750 !important;
}

.nav-link {
  border-radius: 6px;
  color: #475569;
  padding-left: 10px !important;
  padding-right: 10px !important;
}

.nav-link:hover,
.nav-link:focus {
  background: #eef6f8;
  color: var(--oj-heading);
}

.oj-page {
  max-width: 1220px;
}

.oj-panel {
  border-color: var(--oj-border);
  border-radius: var(--oj-radius);
  box-shadow: var(--oj-shadow-sm);
}

.oj-panel:hover {
  border-color: var(--oj-border-strong);
}

.btn {
  border-radius: 6px;
  font-weight: 650;
}

.btn-primary {
  --bs-btn-bg: var(--oj-accent);
  --bs-btn-border-color: var(--oj-accent);
  --bs-btn-hover-bg: var(--oj-accent-dark);
  --bs-btn-hover-border-color: var(--oj-accent-dark);
  --bs-btn-active-bg: var(--oj-accent-dark);
  --bs-btn-active-border-color: var(--oj-accent-dark);
  --bs-btn-color: #ffffff;
  --bs-btn-hover-color: #ffffff;
}

.btn-outline-secondary {
  --bs-btn-color: #334155;
  --bs-btn-border-color: #cbd5e1;
  --bs-btn-hover-bg: #f1f5f9;
  --bs-btn-hover-border-color: #94a3b8;
  --bs-btn-hover-color: #0f172a;
}

input[type="text"],
input:not([type]),
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="url"],
textarea,
select {
  background: #ffffff;
  border-color: #cbd5e1;
  border-radius: 6px;
}

input[type="text"]:focus,
input:not([type]):focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
input[type="url"]:focus,
textarea:focus,
select:focus {
  border-color: var(--oj-accent);
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.18);
}

.oj-table {
  --bs-table-hover-bg: #f8fafc;
  color: #263244;
}

.oj-table thead th {
  background: #f8fafc;
  border-bottom: 1px solid var(--oj-border);
  color: #64748b;
  font-size: 11px;
}

.oj-table tbody td {
  border-color: #edf2f7;
}

.oj-badge {
  border-radius: 999px;
  font-weight: 750;
  letter-spacing: 0;
}

.oj-badge-difficulty-easy,
.oj-badge-easy {
  background: #dcfce7;
  color: #166534;
}

.oj-badge-difficulty-medium,
.oj-badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.oj-badge-difficulty-hard,
.oj-badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.oj-badge-neutral {
  background: #eef2f7;
  color: #334155;
}

.oj-page-heading {
  border-bottom: 1px solid rgba(203, 213, 225, 0.7);
  padding-bottom: 14px;
}

.oj-stat {
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.oj-form-grid {
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
}

.oj-empty-state {
  color: var(--oj-muted);
  padding: 28px;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}

/* Variant A: dense light dashboard finalization. */
:root {
  --oj-bg: #f3f6f9;
  --oj-panel: #ffffff;
  --oj-panel-muted: #f8fafc;
  --oj-border: #dbe3ec;
  --oj-border-strong: #bdc9d8;
  --oj-muted: #64748b;
  --oj-text: #172033;
  --oj-heading: #0f172a;
  --oj-accent: #0891b2;
  --oj-accent-dark: #0e7490;
  --oj-accent-soft: #e0f7fb;
  --oj-focus: rgba(8, 145, 178, 0.18);
  --oj-radius: 8px;
  --oj-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --oj-shadow-md: 0 18px 42px rgba(15, 23, 42, 0.10);
}

body {
  background:
    linear-gradient(180deg, rgba(224, 247, 251, 0.72), rgba(243, 246, 249, 0) 360px),
    var(--oj-bg);
  color: var(--oj-text);
  font-size: 14px;
}

.oj-navbar {
  background: rgba(255, 255, 255, 0.92) !important;
  border-bottom: 1px solid rgba(189, 201, 216, 0.75);
  box-shadow: none;
  min-height: 60px;
  position: sticky;
  top: 0;
  z-index: 1030;
}

.navbar-brand {
  color: var(--oj-heading);
  font-size: 18px;
  font-weight: 800 !important;
}

.nav-link {
  border-radius: 6px;
  color: #475569;
  font-weight: 650;
  line-height: 1.25;
}

.nav-link:hover,
.nav-link:focus {
  background: #eef7fa;
  color: var(--oj-heading);
}

.oj-page {
  max-width: 1220px;
}

.oj-panel {
  background: var(--oj-panel);
  border-color: var(--oj-border);
  border-radius: var(--oj-radius);
  box-shadow: var(--oj-shadow-sm);
}

.oj-panel.overflow-hidden {
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.oj-page-heading,
.oj-page > .d-flex.justify-content-between.align-items-end.mb-3,
.oj-manage-content > .d-flex.justify-content-between.align-items-end.mb-3 {
  align-items: flex-end;
  border-bottom: 1px solid rgba(189, 201, 216, 0.72);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  padding-bottom: 14px;
}

.oj-page-heading h1,
.oj-page > .d-flex.justify-content-between.align-items-end.mb-3 h1,
.oj-manage-content > .d-flex.justify-content-between.align-items-end.mb-3 h1 {
  color: var(--oj-heading);
  font-weight: 800 !important;
}

form.oj-panel.p-3,
.oj-filter-panel {
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  border-color: var(--oj-border);
}

.form-label {
  color: #334155;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.01em;
}

input[type="text"],
input:not([type]),
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="url"],
textarea,
select {
  border-color: #cbd5e1;
  border-radius: 6px;
  min-height: 40px;
}

input[type="text"]:focus,
input:not([type]):focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
input[type="url"]:focus,
textarea:focus,
select:focus {
  border-color: var(--oj-accent);
  box-shadow: 0 0 0 3px var(--oj-focus);
}

.btn {
  border-radius: 6px;
  font-weight: 750;
}

.btn-primary {
  --bs-btn-bg: var(--oj-accent);
  --bs-btn-border-color: var(--oj-accent);
  --bs-btn-hover-bg: var(--oj-accent-dark);
  --bs-btn-hover-border-color: var(--oj-accent-dark);
  --bs-btn-active-bg: var(--oj-accent-dark);
  --bs-btn-active-border-color: var(--oj-accent-dark);
  color: #ffffff;
}

.btn-outline-secondary {
  --bs-btn-color: #334155;
  --bs-btn-border-color: #cbd5e1;
  --bs-btn-hover-bg: #f1f5f9;
  --bs-btn-hover-border-color: #94a3b8;
  --bs-btn-hover-color: #0f172a;
}

.oj-table {
  --bs-table-hover-bg: #f7fbfd;
  color: #273244;
}

.oj-table thead th {
  background: #f8fafc;
  border-bottom: 1px solid var(--oj-border);
  color: #64748b;
  font-size: 11px;
  font-weight: 800;
  padding-bottom: 11px;
  padding-top: 11px;
}

.oj-table tbody td {
  border-color: #edf2f7;
  padding-bottom: 14px;
  padding-top: 14px;
}

.oj-table tbody tr:hover td {
  background: #f7fbfd;
}

.oj-badge {
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.oj-badge-difficulty-easy,
.oj-badge-easy {
  background: #dcfce7;
  color: #166534;
}

.oj-badge-difficulty-medium,
.oj-badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.oj-badge-difficulty-hard,
.oj-badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.oj-badge-neutral {
  background: #eef2f7;
  color: #334155;
}

.oj-stat {
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  border-left: 3px solid var(--oj-accent);
}

.oj-stat .h3,
.oj-stat strong {
  color: var(--oj-heading);
  font-weight: 850;
}

.oj-pre {
  background: #f8fafc;
  border: 1px solid var(--oj-border);
  border-radius: 6px;
}

.oj-code-pre {
  background: #0f172a;
  border-color: #1e293b;
  color: #e2e8f0;
}

.pagination .page-link {
  border-color: var(--oj-border);
  color: #334155;
  font-weight: 650;
}

.pagination .page-link:hover {
  background: #eef7fa;
  color: var(--oj-heading);
}

.oj-empty-state {
  color: var(--oj-muted);
  padding: 28px;
  text-align: center;
}

.oj-cell-primary,
.oj-cell-secondary {
  display: block;
  min-width: 0;
  overflow-wrap: anywhere;
}

.oj-cell-primary {
  color: var(--oj-heading);
  font-weight: 750;
}

.oj-cell-secondary {
  color: var(--oj-muted);
  font-size: 12px;
  margin-top: 2px;
}

.oj-line-clamp-2,
.oj-line-clamp-3 {
  -webkit-box-orient: vertical;
  display: -webkit-box !important;
  overflow: hidden;
}

.oj-line-clamp-2 {
  -webkit-line-clamp: 2;
  line-clamp: 2;
}

.oj-line-clamp-3 {
  -webkit-line-clamp: 3;
  line-clamp: 3;
}

.oj-table-cards td {
  min-width: 0;
}

.oj-table-fixed {
  table-layout: fixed;
}

.oj-table-roomy {
  table-layout: auto;
}

.oj-table .oj-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  align-items: flex-start;
  max-height: 62px;
  overflow: hidden;
  position: relative;
}

.oj-table .oj-tag-list .oj-badge {
  max-width: 100%;
  overflow-wrap: anywhere;
  white-space: normal;
}

.oj-table-card-label {
  color: var(--oj-muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.oj-table-actions-wide {
  min-width: 240px;
  padding-right: 18px !important;
  width: 1%;
}

.oj-table-actions {
  max-width: 100%;
  white-space: normal;
}

td.oj-table-actions {
  min-width: 164px;
  padding-right: 18px !important;
  text-align: right;
  width: 1%;
}

.oj-table-actions > .btn,
.oj-table-actions > form {
  margin-bottom: 4px;
  margin-left: 8px;
  margin-top: 4px;
  vertical-align: middle;
}

.oj-table-actions > .btn:first-child,
.oj-table-actions > form:first-child {
  margin-left: 0;
}

.oj-table-actions form {
  display: inline-flex;
}

.oj-table-actions .btn {
  align-items: center;
  display: inline-flex;
  justify-content: center;
}

@media (max-width: 767.98px) {
  .oj-page-heading,
  .oj-page > .d-flex.justify-content-between.align-items-end.mb-3,
  .oj-manage-content > .d-flex.justify-content-between.align-items-end.mb-3 {
    align-items: stretch;
    flex-direction: column;
  }

  .oj-table-cards {
    border-collapse: separate;
    border-spacing: 0 12px;
    min-width: 0;
  }

  .oj-table-cards thead {
    display: none;
  }

  .oj-table-cards tbody,
  .oj-table-cards tr,
  .oj-table-cards td {
    display: block;
    width: 100%;
  }

  .oj-table-cards tbody tr {
    background: #ffffff;
    border: 1px solid var(--oj-border);
    border-radius: var(--oj-radius);
    box-shadow: var(--oj-shadow-sm);
    margin-bottom: 12px;
    overflow: hidden;
  }

  .oj-table-cards tbody tr.oj-submission-detail-row {
    border: 0;
    box-shadow: none;
    margin-top: -12px;
  }

  .oj-table-cards td {
    border-bottom: 1px solid #edf2f7;
    padding: 10px 12px;
  }

  .oj-table-cards td:last-child {
    border-bottom: 0;
  }

  .oj-table-cards td[data-label] {
    display: grid;
    gap: 8px;
    grid-template-columns: minmax(88px, 0.34fr) minmax(0, 1fr);
  }

  .oj-table-cards td[data-label]::before {
    color: var(--oj-muted);
    content: attr(data-label);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.04em;
    line-height: 1.35;
    text-transform: uppercase;
  }

  .oj-table-cards td.oj-table-actions,
  .oj-table-cards td[data-label].oj-table-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-start;
    min-width: 0;
    width: 100%;
  }

  .oj-table-cards td.oj-table-actions::before {
    flex: 0 0 100%;
  }

  .oj-table-cards .oj-table-actions .btn,
  .oj-table-cards .oj-table-actions form {
    margin-left: 0;
  }

  .oj-table-cards .oj-table-actions .btn {
    flex: 1 1 auto;
  }

  .oj-table-cards .text-nowrap {
    white-space: normal !important;
  }

  .oj-filter-actions {
    display: grid;
    gap: 8px;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .oj-filter-actions .btn {
    min-width: 0;
    width: 100%;
  }

  form.oj-panel > .row {
    --bs-gutter-x: 0;
    margin-left: 0;
    margin-right: 0;
  }
}

@media (max-width: 991.98px) {
  .oj-navbar {
    background: #ffffff !important;
    min-height: 64px;
  }

  .oj-navbar .oj-page {
    align-items: center;
    flex-wrap: wrap;
    gap: 0;
  }

  .oj-navbar .navbar-brand {
    padding-bottom: 12px;
    padding-top: 12px;
  }

  .oj-navbar .navbar-toggler {
    background: #ffffff;
    border-color: var(--oj-border-strong);
    border-radius: 8px;
    box-shadow: var(--oj-shadow-sm);
    margin-left: auto;
    padding: 8px 10px;
    position: relative;
    z-index: 2;
  }

  .oj-navbar .navbar-toggler:focus {
    box-shadow: 0 0 0 3px var(--oj-focus);
  }

  .oj-navbar .navbar-collapse {
    background: #ffffff;
    border: 1px solid var(--oj-border);
    border-radius: var(--oj-radius);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
    flex-basis: 100%;
    margin-bottom: 12px;
    margin-top: 0;
    padding: 10px;
    position: relative;
    width: 100%;
    z-index: 1;
  }

  .oj-navbar .navbar-nav {
    gap: 6px;
    width: 100%;
  }

  .oj-navbar .nav-item,
  .oj-navbar .nav-link,
  .oj-navbar .navbar-nav form,
  .oj-navbar .navbar-nav .btn {
    width: 100%;
  }

  .oj-navbar .nav-link {
    display: block;
    padding: 10px 12px !important;
  }

  .oj-navbar .navbar-nav .btn {
    display: block;
    margin-top: 6px !important;
    padding: 10px 12px;
    text-align: center;
  }
}