:root {
  --color-primary: #092a5e;
  --color-primary-700: #071f46;
  --color-primary-100: #eaf1ff;
  --color-accent: #ed001f;
  --color-accent-700: #b90018;
  --color-ink: #101828;
  --color-muted: #667085;
  --color-line: #d7deea;
  --color-soft: #f4f7fb;
  --color-surface: #ffffff;
  --shadow-card: 0 18px 50px rgba(9, 42, 94, 0.12);
  --font-sans: "Segoe UI Variable", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Aptos Display", "Segoe UI Variable Display", "Segoe UI", var(--font-sans);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at 18% 12%, rgba(237, 0, 31, 0.12), transparent 28%),
    linear-gradient(135deg, #f7f9fc, #eef4ff);
  line-height: 1.6;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

.is-hidden {
  display: none !important;
}

.admin-page {
  min-height: 100vh;
}

.login-panel {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card,
.manager-card {
  width: min(100%, 520px);
  padding: 34px;
  border: 1px solid var(--color-line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-card);
}

.login-card img {
  width: 220px;
  margin-bottom: 28px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--color-primary);
  font-weight: 800;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--color-accent);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--color-primary);
  font-family: var(--font-display);
  letter-spacing: -0.035em;
  line-height: 1.12;
}

.login-card h1,
.workspace-header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

p {
  color: var(--color-muted);
}

.admin-form {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.field-group {
  display: grid;
  gap: 8px;
}

.field-group--checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  border-radius: 14px;
  background: #ffffff;
  cursor: pointer;
}

.field-group--checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  min-height: 0;
  padding: 0;
  margin: 0;
  border: 1px solid rgba(9, 42, 94, 0.35);
  border-radius: 4px;
  background: #ffffff;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.field-group--checkbox span {
  color: var(--color-primary);
  font-weight: 700;
}

.field-group--checkbox .form-help {
  flex-basis: 100%;
  margin: 4px 0 0;
  color: var(--color-muted);
  font-weight: 400;
}

.admin-form label {
  color: var(--color-primary);
  font-weight: 800;
}

.admin-form input,
.admin-form select,
.admin-form textarea {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  color: var(--color-ink);
  border: 1px solid var(--color-line);
  border-radius: 14px;
  background: #ffffff;
}

.admin-form select {
  height: 48px;
  line-height: 1.2;
}

.admin-form textarea {
  min-height: 110px;
  padding-block: 12px;
  resize: vertical;
}

.jodit-container {
  overflow: hidden;
  border-color: var(--color-line) !important;
  border-radius: 16px !important;
}

.jodit-toolbar__box {
  background: var(--color-soft) !important;
}

.jodit-wysiwyg {
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.7;
}

.admin-form input:focus,
.admin-form select:focus,
.admin-form textarea:focus {
  border-color: var(--color-primary);
  outline: 3px solid rgba(9, 42, 94, 0.16);
}

.upload-box {
  position: relative;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  align-items: center;
  min-height: 128px;
  padding: 14px;
  border: 1px dashed rgba(9, 42, 94, 0.32);
  border-radius: 18px;
  background: linear-gradient(135deg, #ffffff, var(--color-soft));
}

.upload-box strong {
  display: block;
  color: var(--color-primary);
  font-size: 1rem;
}

.upload-box span {
  display: block;
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.upload-box input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.image-preview {
  width: 120px;
  height: 96px;
  object-fit: cover;
  border-radius: 14px;
  background: var(--color-primary-100);
  box-shadow: 0 8px 22px rgba(9, 42, 94, 0.14);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 18px;
  border: 0;
  border-radius: 999px;
  font-weight: 850;
  cursor: pointer;
}

.button-primary {
  color: #ffffff;
  background: var(--color-accent);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--color-accent-700);
}

.button-secondary {
  color: var(--color-primary);
  border: 1px solid var(--color-line);
  background: #ffffff;
}

.form-help {
  margin: 2px 0 0;
  font-size: 0.9rem;
}

.feedback {
  min-height: 24px;
  margin: 0;
  font-weight: 800;
}

.feedback.error {
  color: var(--color-accent-700);
}

.dashboard {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 28px;
  overflow-x: hidden;
  overflow-y: auto;
  color: #ffffff;
  background: linear-gradient(180deg, var(--color-primary), var(--color-primary-700));
  -webkit-overflow-scrolling: touch;
}

.brand img {
  width: 210px;
  padding: 8px;
  border-radius: 16px;
  background: #ffffff;
}

.admin-nav {
  display: grid;
  gap: 10px;
  flex: 1 1 auto;
  min-height: 0;
  align-content: start;
}

.admin-nav-btn {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 46px;
  padding: 0 16px;
  color: rgba(255, 255, 255, 0.82);
  text-align: left;
  font-weight: 800;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
  cursor: pointer;
  box-sizing: border-box;
  font: inherit;
}

.admin-nav-btn:hover,
.admin-nav-btn:focus-visible,
.admin-nav-btn.is-active {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.12);
}

.sidebar-footer {
  position: relative;
  display: grid;
  gap: 12px;
  margin-top: auto;
}

.admin-sidebar-footer-btn {
  width: 100%;
  min-height: 44px;
  padding: 0 14px;
  color: rgba(255, 255, 255, 0.92);
  font: inherit;
  font-weight: 800;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.admin-sidebar-footer-btn:hover,
.admin-sidebar-footer-btn:focus-visible {
  border-color: rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.16);
}

.admin-password-panel {
  position: absolute;
  z-index: 20;
  left: 0;
  right: 0;
  bottom: calc(100% + 12px);
  padding: 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(180deg, var(--color-primary-700), #051636);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.38);
}

.admin-password-panel.is-hidden {
  display: none;
}

.admin-password-form label {
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.82rem;
}

.admin-password-form input {
  width: 100%;
  min-height: 42px;
  padding: 0 12px;
  margin-bottom: 10px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-ink);
  font: inherit;
}

.admin-password-form .button {
  width: 100%;
  margin-top: 4px;
}

.admin-password-form .feedback {
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.85rem;
}

.admin-password-form .feedback.error {
  color: #ffb4b4;
}

.workspace {
  padding: 36px;
}

.workspace-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.manager-card {
  width: 100%;
}

.manager-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-line);
}

.editor-form {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding-bottom: 26px;
  border-bottom: 1px solid var(--color-line);
}

.editor-form.staff-form {
  grid-template-columns: minmax(0, 1fr);
}

.editor-form.staff-form .staff-perm-box {
  max-width: 100%;
}

.staff-status-group {
  max-width: 260px;
}

.editor-form .field-group:has(textarea),
.form-actions {
  grid-column: 1 / -1;
}

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

.item-list {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.staff-perm-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.staff-perm-row input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.staff-perm-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 14px;
}

.staff-perm-role-note {
  display: none;
  margin: 6px 0 0;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(9, 42, 94, 0.06);
  color: var(--color-ink);
}

.admin-members-warning {
  margin-bottom: 16px;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(181, 71, 8, 0.1);
  border: 1px solid rgba(181, 71, 8, 0.3);
  color: #8a3e08;
  font-weight: 700;
}

.news-status-pill {
  display: inline-block;
  margin: 6px 0 4px;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: rgba(181, 71, 8, 0.12);
  color: #b54708;
}

.admin-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: 18px;
  background: var(--color-soft);
}

.admin-item h3 {
  font-size: 1.08rem;
}

.admin-item p {
  margin: 6px 0 0;
}

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

.text-button {
  min-height: 38px;
  padding: 0 12px;
  color: var(--color-primary);
  font-weight: 850;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: #ffffff;
  cursor: pointer;
}

.text-button.danger {
  color: var(--color-accent-700);
}

.empty-state {
  padding: 18px;
  border-radius: 18px;
  background: var(--color-soft);
}

.admin-members-warning {
  margin-bottom: 12px;
  border: 1px solid rgba(237, 0, 31, 0.35);
  color: var(--color-primary);
  font-weight: 750;
}

.checkbox-grid {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  padding: 12px;
  border: 1px solid var(--color-line);
  border-radius: 12px;
  background: #ffffff;
  max-height: 280px;
  overflow-y: auto;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
  margin-top: 3px;
}

.checkbox-label {
  display: grid;
  gap: 2px;
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.92rem;
}

.checkbox-meta {
  font-weight: 400;
  opacity: 0.75;
  font-size: 0.82rem;
}

.instructor-thumb {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-line);
  margin-bottom: 8px;
  background: #f4f6f9;
}

.course-structure {
  display: grid;
  gap: 24px;
  margin-top: 12px;
}

.course-structure.is-hidden {
  display: none;
}

.course-structure-loading,
.course-structure-error {
  padding: 24px;
  border-radius: 16px;
  background: var(--color-soft);
}

.course-structure-error {
  border: 1px solid rgba(237, 0, 31, 0.4);
  color: var(--color-accent-700);
}

.structure-header {
  display: grid;
  gap: 8px;
}

.structure-title {
  margin: 0;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
}

.structure-help {
  color: var(--color-muted, #5a6470);
  margin: 0;
}

.structure-block {
  display: grid;
  gap: 12px;
  padding: 20px;
  border-radius: 18px;
  background: var(--color-soft);
}

.structure-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.structure-block-head h4,
.structure-block-head h5 {
  margin: 0;
  font-size: 1rem;
}

.structure-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: none;
}

.structure-item {
  border: 1px solid var(--color-line);
  border-radius: 14px;
  background: #ffffff;
  padding: 14px 16px;
}

.structure-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.structure-toggle {
  flex: 1 1 auto;
  text-align: left;
  background: none;
  border: 0;
  padding: 0;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
  cursor: pointer;
}

.structure-toggle::before {
  content: "▸ ";
}

.structure-toggle[aria-expanded="true"]::before {
  content: "▾ ";
}

.structure-status {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(13, 102, 56, 0.15);
  color: #0d6638;
}

.structure-status.is-draft {
  background: rgba(214, 158, 0, 0.16);
  color: #8b6300;
}

.structure-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.structure-summary-text,
.structure-meta {
  margin: 6px 0 0;
  color: var(--color-muted, #5a6470);
  font-size: 0.88rem;
}

.structure-children {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-line);
  display: grid;
  gap: 10px;
}

.structure-children .structure-block-head {
  margin-bottom: 4px;
}

.structure-empty {
  margin: 0;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.04);
  color: var(--color-muted, #5a6470);
}

.structure-form {
  margin-top: 12px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--color-line);
  background: #fafbfd;
  display: grid;
  gap: 10px;
}

.structure-field {
  display: grid;
  gap: 4px;
}

.structure-field label {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-primary);
  display: grid;
  gap: 4px;
}

.structure-field input[type="text"],
.structure-field input[type="number"],
.structure-field select,
.structure-field textarea {
  width: 100%;
  font: inherit;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--color-line);
  background: #ffffff;
}

.structure-field textarea {
  resize: vertical;
}

.structure-hint {
  margin: 0;
  font-size: 0.78rem;
  color: var(--color-muted, #5a6470);
}

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

.button.button-sm {
  min-height: 32px;
  padding: 0 12px;
  font-size: 0.85rem;
}

.structure-detail {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}

.structure-content-preview {
  padding: 12px 14px;
  background: rgba(9, 42, 94, 0.05);
  border-radius: 12px;
  line-height: 1.55;
}

.structure-attachments h6 {
  margin: 8px 0 4px;
  font-size: 0.85rem;
  color: var(--color-primary);
}

.structure-attach-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.structure-attach-list li {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 0.88rem;
}

.structure-attach-meta {
  color: var(--color-muted, #5a6470);
}

.structure-attach-upload {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.structure-attach-upload input[type="text"] {
  flex: 1 1 160px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--color-line);
}

.structure-question-prompt {
  margin: 6px 0 0;
  white-space: pre-wrap;
}

.structure-options {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.structure-options li {
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.04);
  font-size: 0.92rem;
}

.structure-options li.is-correct {
  background: rgba(13, 102, 56, 0.15);
  color: #0d6638;
  font-weight: 700;
}

.structure-options-editor {
  display: grid;
  gap: 6px;
}

.structure-option-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.structure-option-row input[type="text"] {
  flex: 1 1 auto;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--color-line);
}

@media (max-width: 900px) {
  .dashboard {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

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

  .workspace {
    padding: 24px;
  }

  .workspace-header,
  .manager-heading,
  .admin-item {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .login-card,
  .manager-card {
    padding: 24px;
  }

  .admin-nav,
  .editor-form {
    grid-template-columns: 1fr;
  }

  .workspace-header .button,
  .manager-heading .button,
  .form-actions .button {
    width: 100%;
  }

  .upload-box {
    grid-template-columns: 1fr;
  }

  .image-preview {
    width: 100%;
    height: 170px;
  }
}