/* =============================================================
   forms.css — поля ввода, чекбоксы, радио, label, ошибки.
   Источник: UI Kit — 74:939 Password Field, 74:991 Surname Field,
   127:294 Checkbox, 97:1279 Number Field.
   ============================================================= */

/* ----- Контейнер поля ----- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.field--inline {
  flex-direction: row;
  align-items: center;
  gap: var(--space-10);
}

/* ----- Label ----- */
.label {
  font-size: var(--fs-16);
  font-weight: var(--fw-medium);
  color: var(--color-ink);
  line-height: 1.2;
}

.label--required::after {
  content: " *";
  color: var(--color-error);
}

.help {
  font-size: var(--fs-12);
  color: var(--color-ink-56);
  line-height: 1.4;
}

.error-text {
  font-size: var(--fs-12);
  color: var(--color-error);
  font-weight: var(--fw-medium);
  line-height: 1.4;
}

/* ----- Базовый input ----- */
.input,
.textarea,
.select {
  display: block;
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  line-height: 1.25;
  color: var(--color-ink);
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  padding: var(--space-16) var(--space-20);
  border-radius: var(--radius-lg);   /* 12px по умолчанию */
  transition: border-color .2s ease, box-shadow .2s ease;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-grey-500);
}

.input:hover:not(:disabled),
.textarea:hover:not(:disabled),
.select:hover:not(:disabled) {
  border-color: var(--color-grey-400);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-80);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  background: var(--color-grey-200);
  color: var(--color-grey-500);
  cursor: not-allowed;
}

.input.is-error,
.textarea.is-error,
.select.is-error {
  border-color: var(--color-error);
}

.input.is-error:focus,
.textarea.is-error:focus,
.select.is-error:focus {
  box-shadow: 0 0 0 3px var(--color-error-80);
}

/* ----- Pill input (login, password) ----- */
.input--pill {
  border-radius: var(--radius-pill-lg);   /* 100px */
}

/* ----- Underline-вариант (модалки) ----- */
.input--underline {
  border: none;
  border-bottom: 1px solid var(--color-grey-300);
  border-radius: 0;
  padding: var(--space-20) 0;
  background: transparent;
}

.input--underline:focus {
  box-shadow: none;
  border-bottom-color: var(--color-primary);
}

/* ----- Textarea ----- */
.textarea {
  min-height: 120px;
  resize: vertical;
}

/* ----- Select ----- */
.select {
  appearance: none;
  background-image: url("../img/icons/arrow-down.svg");
  background-repeat: no-repeat;
  background-position: right var(--space-20) center;
  background-size: 12px 8px;
  padding-right: calc(var(--space-20) + 12px + var(--space-12));
}

/* ----- Поле с иконкой слева ----- */
.input-group {
  position: relative;
}

.input-group .input {
  padding-left: calc(var(--space-20) + 20px + var(--space-10));
}

.input-group .input-group__icon {
  position: absolute;
  top: 50%;
  left: var(--space-20);
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-grey-500);
  pointer-events: none;
}

.input-group .input-group__icon img,
.input-group .input-group__icon svg {
  width: 100%;
  height: 100%;
}

/* Кнопка-«глаз» для пароля */
.input-group .input-group__action {
  position: absolute;
  top: 50%;
  right: var(--space-16);
  transform: translateY(-50%);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  display: inline-flex;
  color: var(--color-grey-500);
}

/* ----- Checkbox ----- */
.checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  cursor: pointer;
  font-size: var(--fs-14);
  color: var(--color-ink);
  line-height: 1.3;
}

.checkbox input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.checkbox__box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--color-grey-400);
  border-radius: var(--radius-xs);   /* 4px */
  background: var(--color-white);
  flex-shrink: 0;
  transition: background-color .15s ease, border-color .15s ease;
}

.checkbox__box::after {
  content: "";
  display: block;
  width: 8px;
  height: 6px;
  background: url("../img/icons/check.svg") center/contain no-repeat;
  filter: brightness(0) invert(1);   /* чтобы галка стала белой */
  opacity: 0;
  transition: opacity .15s ease;
}

.checkbox input:checked + .checkbox__box {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.checkbox input:checked + .checkbox__box::after {
  opacity: 1;
}

.checkbox input:focus-visible + .checkbox__box {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.checkbox input:disabled + .checkbox__box {
  background: var(--color-grey-200);
  border-color: var(--color-grey-300);
  cursor: not-allowed;
}

/* ----- Radio ----- */
.radio {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  cursor: pointer;
  font-size: var(--fs-14);
  color: var(--color-ink);
}

.radio input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio__circle {
  position: relative;
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--color-grey-400);
  border-radius: 50%;
  background: var(--color-white);
  flex-shrink: 0;
  transition: border-color .15s ease;
}

.radio__circle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  transform: translate(-50%, -50%) scale(0);
  transition: transform .15s ease;
}

.radio input:checked + .radio__circle {
  border-color: var(--color-primary);
}

.radio input:checked + .radio__circle::after {
  transform: translate(-50%, -50%) scale(1);
}

.radio input:focus-visible + .radio__circle {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ----- Upload-зона (dashed border, UI Kit Download Info) ----- */
.upload {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-12);
  padding: var(--space-40) var(--space-20);
  border: 1.5px dashed var(--color-grey-450);
  border-radius: var(--radius-md);   /* 10px */
  background: var(--color-white);
  color: var(--color-grey-600);
  text-align: center;
  cursor: pointer;
  transition: border-color .2s ease, background-color .2s ease;
}

.upload:hover {
  border-color: var(--color-primary);
  background: var(--color-off-white);
}

.upload__icon {
  width: 32px;
  height: 32px;
  color: var(--color-grey-500);
}

/* ===== Красивое поле загрузки файла с кнопкой «Удалить» ===== */
.file-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-field__current {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--color-grey-200);
  border-radius: 12px;
  background: var(--color-off-white);
}

.file-field__thumb {
  width: 56px;
  height: 56px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--color-grey-100);
}

.file-field__thumb--file {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--color-grey-500);
}

.file-field__info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-field__name {
  font-size: 13px;
  color: var(--color-ink);
  word-break: break-all;
  overflow-wrap: anywhere;
}

.file-field__link {
  font-size: 12px;
  color: var(--color-primary);
  text-decoration: none;
  width: max-content;
}

.file-field__link:hover {
  text-decoration: underline;
}

.file-field__delete {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--color-grey-300);
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  color: var(--color-error);
  transition: background-color .15s ease, border-color .15s ease;
  user-select: none;
  flex-shrink: 0;
}

.file-field__delete:hover {
  background: rgba(255, 45, 49, 0.06);
  border-color: var(--color-error);
}

.file-field__delete input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 0; height: 0;
}

.file-field__delete:has(input:checked) {
  background: var(--color-error);
  border-color: var(--color-error);
  color: var(--color-white);
}

.file-field__delete-text {
  font-weight: 500;
  letter-spacing: 0.2px;
}

.file-field__replace-label {
  font-size: 12px;
  color: var(--color-ink-56);
  margin-top: 2px;
}

/* Кастомная «drop-zone»: сам input скрыт, кликается кнопка/label */
.file-input-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
  opacity: 0;
  pointer-events: none;
}

.file-field__drop {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-off-white);
  border: 1.5px dashed var(--color-grey-300);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color .15s ease, background-color .15s ease;
  user-select: none;
}

.file-field__drop:hover,
.file-field__drop.is-drag {
  border-color: var(--color-primary);
  background: rgba(217, 182, 1, 0.06);
}

.file-field__drop.is-picked {
  border-style: solid;
  border-color: var(--color-primary);
  background: rgba(217, 182, 1, 0.10);
}

.file-field__drop-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--color-ink);
  color: var(--color-white);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.file-field__drop-hint {
  font-size: 13px;
  color: var(--color-ink-56);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-field__drop.is-picked .file-field__drop-hint {
  color: var(--color-ink);
  font-weight: 500;
}

/* ===== Мультиселект с поиском (CheckboxSelectMultiple) ===== */
.picker {
  border: 1px solid var(--color-grey-200);
  border-radius: 14px;
  background: var(--color-white);
  overflow: hidden;
}

.picker__toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-grey-200);
  background: var(--color-off-white);
  flex-wrap: wrap;
}

.picker__search {
  flex: 1;
  min-width: 180px;
  border: 1px solid var(--color-grey-200);
  border-radius: 10px;
  padding: 8px 12px 8px 34px;
  font-size: 14px;
  background: var(--color-white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23838383' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") no-repeat 10px center;
}
.picker__search:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-80, rgba(217,182,1,0.25));
}

.picker__count {
  font-size: 13px;
  color: var(--color-ink-56);
  white-space: nowrap;
}
.picker__count strong { color: var(--color-primary); font-weight: 600; }

.picker__clear {
  font-size: 13px;
  background: transparent;
  border: 1px solid var(--color-grey-200);
  border-radius: 999px;
  padding: 6px 14px;
  color: var(--color-ink);
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease;
}
.picker__clear:hover {
  background: var(--color-white);
  border-color: var(--color-grey-500);
}

.panel-checkboxes {
  list-style: none;
  padding: 8px;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 6px;
  max-height: 340px;
  overflow-y: auto;
  background: var(--color-white);
}
.panel-checkboxes li { display: block; }
.panel-checkboxes li[hidden] { display: none; }

.panel-checkboxes label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.35;
  transition: background-color .12s ease, border-color .12s ease;
}
.panel-checkboxes label:hover {
  background: var(--color-off-white);
  border-color: var(--color-grey-200);
}
.panel-checkboxes label:has(input:checked) {
  background: rgba(217, 182, 1, 0.08);
  border-color: rgba(217, 182, 1, 0.35);
}

.panel-checkboxes input[type="checkbox"] {
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 1px;
}

.picker__empty {
  padding: 20px;
  text-align: center;
  color: var(--color-ink-56);
  font-size: 14px;
}

/* ===== Дерево уроков (Курс → Глава → Уроки) — сворачивающееся ===== */
.lesson-tree {
  border: 1px solid var(--color-grey-200);
  border-radius: 14px;
  background: var(--color-white);
  overflow: hidden;
}

/* Внешнее <summary> — сжатая полоска-хедер */
.lesson-tree__summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  background: linear-gradient(90deg, rgba(217,182,1,0.06), transparent 60%);
  user-select: none;
}
.lesson-tree__summary::-webkit-details-marker { display: none; }
.lesson-tree__summary::marker { content: ""; }

.lesson-tree__caret {
  transition: transform .15s ease;
  color: var(--color-primary);
  font-size: 12px;
  flex-shrink: 0;
}
.lesson-tree[open] > .lesson-tree__summary > .lesson-tree__caret {
  transform: rotate(90deg);
}

.lesson-tree__summary-title {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-ink);
}

.lesson-tree__hint {
  margin-left: auto;
  font-size: 12px;
  color: var(--color-ink-56);
  font-style: italic;
}

.lesson-tree[open] .lesson-tree__hint { display: none; }

.lesson-tree__toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-top: 1px solid var(--color-grey-200);
  border-bottom: 1px solid var(--color-grey-200);
  background: var(--color-off-white);
  flex-wrap: wrap;
}

.lesson-tree__search {
  flex: 1;
  min-width: 180px;
  border: 1px solid var(--color-grey-200);
  border-radius: 10px;
  padding: 8px 12px 8px 34px;
  font-size: 14px;
  background: var(--color-white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23838383' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") no-repeat 10px center;
}
.lesson-tree__search:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-80, rgba(217,182,1,0.25));
}

.lesson-tree__counter {
  font-size: 13px;
  color: var(--color-ink-56);
  white-space: nowrap;
}
.lesson-tree__counter strong { color: var(--color-primary); font-weight: 600; }

/* Кнопки в тулбаре */
.lesson-tree__clear,
.lesson-tree__collapse,
.lesson-tree__expand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 500;
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  border-radius: 10px;
  padding: 7px 14px;
  color: var(--color-ink);
  cursor: pointer;
  transition: all .18s cubic-bezier(.4,0,.2,1);
  white-space: nowrap;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}
.lesson-tree__clear:hover,
.lesson-tree__collapse:hover,
.lesson-tree__expand:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(217, 182, 1, 0.06);
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(217, 182, 1, 0.15);
}
.lesson-tree__clear:active,
.lesson-tree__collapse:active,
.lesson-tree__expand:active {
  transform: translateY(0);
}
.lesson-tree__clear {
  color: var(--color-error, #FF2D31);
  border-color: rgba(255, 45, 49, 0.25);
}
.lesson-tree__clear:hover {
  color: var(--color-white);
  background: var(--color-error, #FF2D31);
  border-color: var(--color-error, #FF2D31);
  box-shadow: 0 3px 8px rgba(255, 45, 49, 0.25);
}
.lesson-tree__clear::before { content: "✕"; font-size: 11px; opacity: 0.7; }
.lesson-tree__collapse::before { content: "▲"; font-size: 9px; opacity: 0.7; }
.lesson-tree__expand::before { content: "▼"; font-size: 9px; opacity: 0.7; }

.lesson-tree__body {
  max-height: 520px;
  overflow-y: auto;
  padding: 8px;
}

.lesson-tree__empty {
  padding: 30px;
  text-align: center;
  color: var(--color-ink-56);
  font-size: 14px;
}

/* Узел «Курс» */
.tree-course {
  border-radius: 12px;
  margin-bottom: 6px;
  background: var(--color-off-white, #FAF9F5);
  overflow: hidden;
}
.tree-course > summary {
  list-style: none;
  padding: 12px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}
.tree-course > summary::-webkit-details-marker { display: none; }
.tree-course > summary::marker { content: ""; }
.tree-course__title {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-ink);
  flex: 1;
}
.tree-course__body {
  padding: 4px 12px 12px 32px;
}

/* Узел «Глава» */
.tree-chapter {
  margin: 6px 0;
  border-radius: 10px;
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  overflow: hidden;
}
.tree-chapter > summary {
  list-style: none;
  padding: 10px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}
.tree-chapter > summary::-webkit-details-marker { display: none; }
.tree-chapter > summary::marker { content: ""; }
.tree-chapter__title {
  font-weight: 500;
  font-size: 14px;
  color: var(--color-ink);
  flex: 1;
}

/* Раскрытие/сворачивание стрелочкой */
.tree-caret {
  display: inline-block;
  transition: transform .15s ease;
  color: var(--color-ink-56);
  font-size: 10px;
  flex-shrink: 0;
  width: 12px;
  text-align: center;
}
details[open] > summary > .tree-caret { transform: rotate(90deg); }

/* Плашка «5/7» */
.tree-badge {
  font-size: 12px;
  color: var(--color-ink-56);
  background: var(--color-grey-100, #F5F4EE);
  padding: 2px 8px;
  border-radius: 999px;
  flex-shrink: 0;
}
.tree-badge[data-course-badge]:has(+ *) { margin-left: auto; }

/* Быстрые кнопки в саммари */
.tree-actions {
  display: inline-flex;
  gap: 6px;
  flex-shrink: 0;
  margin-left: auto;
}
.tree-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  padding: 5px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-ink-56);
  cursor: pointer;
  transition: all .15s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  white-space: nowrap;
}
.tree-btn:hover {
  background: linear-gradient(135deg, rgba(217,182,1,0.12), rgba(217,182,1,0.06));
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: 0 3px 6px rgba(217, 182, 1, 0.18);
}
.tree-btn:active { transform: translateY(0); }
.tree-btn::before { content: "✓"; font-size: 11px; opacity: 0.6; }

/* Компактный вариант для «Все» у главы */
.tree-btn--sm {
  padding: 3px 9px;
  font-size: 11px;
  border-radius: 6px;
}
.tree-btn--sm::before { font-size: 9px; }

/* «Ни одного» — красноватый на hover */
.tree-btn--ghost {
  background: transparent;
  color: var(--color-ink-56);
}
.tree-btn--ghost::before { content: "✕"; }
.tree-btn--ghost:hover {
  background: rgba(255, 45, 49, 0.06);
  border-color: rgba(255, 45, 49, 0.35);
  color: var(--color-error, #FF2D31);
  box-shadow: 0 3px 6px rgba(255, 45, 49, 0.15);
}

/* Список уроков */
.tree-lessons {
  list-style: none;
  padding: 0 12px 10px 30px;
  margin: 0;
}
.tree-lesson {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--color-ink);
  transition: background-color .12s ease;
}
.tree-lesson:hover { background: rgba(217, 182, 1, 0.06); }
.tree-lesson:has(input:checked) {
  background: rgba(217, 182, 1, 0.10);
}
.tree-lesson input[type="checkbox"] {
  accent-color: var(--color-primary);
  width: 17px;
  height: 17px;
  cursor: pointer;
  flex-shrink: 0;
}
.tree-lesson[hidden] { display: none; }

/* Скрытая глава/курс при поиске */
.tree-chapter[hidden],
.tree-course[hidden] { display: none; }