.course-structure-editor__status {
  flex: 1 1 100%;
  margin: 0;
  color: var(--course-meta-text);
  font-size: var(--font-size-100);
  font-weight: 700;
}

.course-structure-editor__status:empty {
  display: none;
}

.course-structure-editor__status.is-error {
  color: #d74444;
}

.course-structure-editor__body {
  display: grid;
  gap: 16px;
}

.course-structure-editor__section {
  border: 1px solid var(--course-card-border);
  border-radius: 18px;
  background: var(--course-card-surface);
  box-shadow: var(--course-card-shadow);
  overflow: hidden;
}

.course-structure-editor__section.is-new,
.course-structure-editor__lesson.is-new {
  border-color: color-mix(in srgb, var(--course-blue) 46%, var(--course-card-border));
}

.course-structure-editor__section-title {
  display: grid;
  grid-template-columns: 34px 28px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 58px;
  padding: 12px 16px;
  color: var(--course-card-title);
  font-size: var(--font-size-300);
  font-family: var(--course-font-editorial);
  font-weight: 700;
  cursor: pointer;
}

.course-structure-editor__section-index,
.course-structure-editor__lesson-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--course-blue) 14%, transparent);
  color: var(--course-blue);
  font-size: var(--font-size-100);
  font-weight: 700;
}

.course-structure-editor__block-drag-handle,
.course-structure-editor__drag-handle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  color: var(--course-action-ghost-text);
  cursor: grab;
}

.course-structure-editor__section-text,
.course-structure-editor__lesson-title {
  min-width: 0;
  font-family: var(--course-font-editorial);
  overflow-wrap: anywhere;
}

.course-structure-editor__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0 16px 16px;
  list-style: none;
}

.course-structure-editor__lesson {
  display: grid;
  grid-template-columns: 48px 28px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 46px;
  padding: 8px 12px;
  border: 1px solid var(--course-card-border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--course-card-surface) 92%, var(--course-blue) 8%);
  color: var(--course-card-title);
  cursor: pointer;
}

.course-structure-editor__section.is-dragging,
.course-structure-editor__lesson.is-dragging {
  opacity: .46;
}

.course-structure-editor__section.is-drop-target,
.course-structure-editor__lesson.is-drop-target {
  outline: 2px solid color-mix(in srgb, var(--course-blue) 70%, white 30%);
  outline-offset: 3px;
}

.course-structure-editor__rename-input {
  width: 100%;
  min-height: 36px;
  padding: 0 10px;
  border: 1px solid color-mix(in srgb, var(--course-blue) 42%, var(--course-card-border));
  border-radius: 10px;
  background: var(--course-card-surface);
  color: var(--course-card-title);
  font:inherit;
  font-weight: 700;
}

.course-structure-editor__context-menu {
  position: fixed;
  z-index: 1056;
  min-width: 220px;
  padding: 6px;
  border: 1px solid var(--course-card-border);
  border-radius: 14px;
  background: var(--course-card-surface);
  box-shadow: 0 18px 44px rgba(0,0,0,.2);
}

.course-structure-editor__context-menu[hidden] {
  display: none;
}

.course-structure-editor__context-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 38px;
  padding: 0 10px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--course-card-title);
  font:inherit;
  font-size: var(--font-size-100);
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.course-structure-editor__context-item:hover {
  background: color-mix(in srgb, var(--course-blue) 12%, transparent);
}

.course-structure-editor__context-item--danger {
  color: #d74444;
}

.course-structure-editor-modal-open {
  overflow: hidden;
}

.course-structure-editor__modal[hidden] {
  display: none;
}

.course-structure-editor__modal {
  position: fixed;
  inset: 0;
  z-index: 1080;
  display: grid;
  place-items: center;
  padding: 20px;
  font-family: var(--course-font-sans);
}

.course-structure-editor__modal-backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  background: color-mix(in srgb, var(--surface-overlay) 82%, transparent);
  backdrop-filter: blur(7px);
}

.course-structure-editor__modal-panel {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  width: min(560px, calc(100vw - 32px));
  max-height: min(720px, calc(100dvh - 32px));
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--course-line);
  border-radius: 28px;
  background:
    radial-gradient(circle at 90% 7%, color-mix(in srgb, var(--course-blue-soft) 72%, transparent), transparent 30%),
    radial-gradient(circle at 8% 94%, color-mix(in srgb, var(--course-paper-warm) 70%, transparent), transparent 34%),
    var(--course-paper);
  color: var(--course-ink);
  box-shadow: 0 30px 90px color-mix(in srgb, var(--course-ink) 24%, transparent), 0 2px 8px color-mix(in srgb, var(--course-ink) 8%, transparent);
}

.course-structure-editor__modal-head {
  position: absolute;
  top: 20px;
  right: 22px;
  z-index: 3;
}

.course-structure-editor__modal-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--course-line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--course-paper) 90%, transparent);
  color: var(--course-muted);
  cursor: pointer;
}

.course-structure-editor__modal-close:hover,
.course-structure-editor__modal-close:focus-visible {
  border-color: color-mix(in srgb, var(--course-blue) 44%, var(--course-line));
  color: var(--course-blue);
  outline: 0;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--course-ink) 10%, transparent);
}

.course-structure-editor__modal-titlebar {
  padding: 32px 78px 18px 34px;
}

.course-structure-editor__modal-titlebar > div {
  display: grid;
  gap: 7px;
}

.course-structure-editor__modal-kicker {
  margin: 0;
  color: var(--course-blue);
  font-size: var(--font-size-100);
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.course-structure-editor__modal--danger .course-structure-editor__modal-kicker {
  color: var(--course-error);
}

.course-structure-editor__modal-title {
  margin: 0;
  color: var(--course-ink);
  font-family: var(--course-font-editorial);
  font-size: clamp(var(--font-size-700), 5vw, var(--font-size-900));
  font-weight: 500;
  letter-spacing: -.025em;
  line-height: 1.04;
}

.course-structure-editor__modal-title::after {
  display: block;
  width: 96px;
  height: 1px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--course-blue), transparent);
  content: "";
}

.course-structure-editor__modal--danger .course-structure-editor__modal-title::after {
  background: linear-gradient(90deg, var(--course-error), transparent);
}

.course-structure-editor__modal-titlebar p:last-child {
  margin: 0;
  color: var(--course-muted);
  font-size: var(--font-size-100);
  font-weight: 500;
  line-height: 1.55;
}

.course-structure-editor__modal-body {
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 14px 34px 24px;
}

.course-structure-editor__modal-notice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--course-line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--course-highlight) 68%, transparent);
}

.course-structure-editor__modal-notice > i {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid color-mix(in srgb, var(--course-blue) 26%, var(--course-line));
  border-radius: 14px;
  background: var(--course-blue-soft);
  color: var(--course-blue);
  font-size: var(--font-size-400);
}

.course-structure-editor__modal--danger .course-structure-editor__modal-notice > i {
  border-color: color-mix(in srgb, var(--course-error) 26%, var(--course-line));
  background: color-mix(in srgb, var(--course-error) 10%, var(--course-paper));
  color: var(--course-error);
}

.course-structure-editor__modal-notice strong {
  display: block;
  margin-bottom: 3px;
  color: var(--course-ink);
}

.course-structure-editor__modal-text {
  margin: 0;
  color: var(--course-copy);
  font-size: var(--font-size-100);
  line-height: 1.55;
}

.course-structure-editor__modal-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--course-line);
  border-radius: 16px;
  background: color-mix(in srgb, var(--course-paper-warm) 62%, transparent);
  color: var(--course-copy);
  font-size: var(--font-size-100);
  font-weight: 700;
  line-height: 1.45;
}

.course-structure-editor__modal-check[hidden] {
  display: none;
}

.course-structure-editor__modal-check input {
  flex: 0 0 auto;
  width: 17px;
  height: 17px;
  margin: 1px 0 0;
  accent-color: var(--course-error);
}

.course-structure-editor__modal-actions {
  margin: 0;
  padding: 17px 34px 22px;
  border-top: 1px solid var(--course-line);
  background: color-mix(in srgb, var(--course-paper) 90%, transparent);
}

.course-structure-editor__modal-btn {
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--course-line);
  border-radius: 14px;
  background: var(--course-paper);
  color: var(--course-muted);
  font:inherit;
  font-size: var(--font-size-100);
  font-weight: 700;
  cursor: pointer;
}

.course-structure-editor__modal-btn:hover,
.course-structure-editor__modal-btn:focus-visible {
  border-color: color-mix(in srgb, var(--course-blue) 34%, var(--course-line));
  color: var(--course-ink);
  outline: 0;
  transform: translateY(-1px);
  box-shadow: 0 10px 20px color-mix(in srgb, var(--course-ink) 8%, transparent);
}

.course-structure-editor__modal-btn--primary {
  min-width: 156px;
  border-color: var(--course-blue);
  background: linear-gradient(180deg, var(--course-blue-bright), var(--course-blue));
  color: var(--course-on-accent);
}

.course-structure-editor__modal-btn--danger {
  min-width: 132px;
  border-color: var(--course-error);
  background: linear-gradient(180deg, color-mix(in srgb, var(--course-error) 84%, white), var(--course-error));
  color: var(--course-on-accent);
}

.course-structure-editor__modal-btn--danger-ghost {
  border-color: color-mix(in srgb, var(--course-error) 34%, var(--course-line));
  color: var(--course-error);
}

@media (max-width: 640px) {
  .course-structure-editor__modal {
    padding: 10px;
  }

  .course-structure-editor__modal-panel {
    width: calc(100vw - 20px);
    max-height: calc(100dvh - 20px);
    border-radius: 20px;
  }

  .course-structure-editor__modal-head {
    top: 14px;
    right: 14px;
  }

  .course-structure-editor__modal-titlebar {
    padding: 22px 66px 16px 18px;
  }

  .course-structure-editor__modal-body {
    padding: 12px 18px 20px;
  }

  .course-structure-editor__modal-actions {
    padding: 16px 18px 20px;
  }

  .course-structure-editor__modal-actions .admin-editor-modal__action-buttons {
    width: 100%;
  }

  .course-structure-editor__modal-btn {
    flex: 1 1 0;
    padding-inline: 12px;
  }
}