/* ============================================================
   layout.css — Каркас прототипа LMS
   Покрывает: базовый сброс внутри .rmk-proto, каркас страницы
   (сайдбар + хедер + контент + футер), двухколоночный layout
   страницы урока.
   ============================================================ */

/* ---------- Базовый сброс (только в скоупе .rmk-proto) ---------- */
.rmk-proto *,
.rmk-proto *::before,
.rmk-proto *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.rmk-proto {
  font-family: var(--rmk-font-family);
  font-size: 14px;
  line-height: 1.5;
  color: var(--rmk-gray-900);
  background: var(--rmk-gray-100);
  -webkit-font-smoothing: antialiased;
}

.rmk-proto a {
  text-decoration: none;
  color: inherit;
}

.rmk-proto ul,
.rmk-proto ol {
  list-style: none;
}

.rmk-proto button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.rmk-proto img,
.rmk-proto svg {
  display: block;
}

/* ---------- Каркас страницы ---------- */
.rmk-page {
  display: flex;
  min-height: 100vh;
}

.rmk-page--main {
  min-height: calc(100vh - 64px);
}

.rmk-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.rmk-content {
  flex: 1;
  padding: 28px 32px 48px;
}

.rmk-content--flush {
  padding: 24px 28px 40px;
}

/* ---------- Сайдбар ---------- */
.rmk-sidebar {
  width: 236px;
  flex-shrink: 0;
  background: var(--rmk-white);
  border-right: 1px solid var(--rmk-gray-200);
  display: flex;
  flex-direction: column;
  padding: 20px 14px 24px;
  min-height: 100vh;
}

.rmk-sidebar__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
  margin-bottom: 22px;
}

.rmk-logo__emblem {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--rmk-primary-700), var(--rmk-primary-500));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--rmk-white);
  box-shadow: var(--rmk-shadow-card);
}

.rmk-logo__text {
  text-transform: uppercase;
  font-weight: 700;
  font-size: 12px;
  line-height: 1.35;
  color: var(--rmk-primary-700);
  letter-spacing: .02em;
}

/* Плашка пользователя */
.rmk-sidebar__user {
  padding: 0 4px;
  margin-bottom: 18px;
}

.rmk-user-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--rmk-gray-100);
  border-radius: var(--rmk-radius-pill);
  padding: 6px 12px 6px 6px;
}

.rmk-user-card__avatar {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--rmk-gray-400);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--rmk-white);
}

.rmk-user-card__role {
  font-size: 13px;
  font-weight: 600;
  color: var(--rmk-gray-600);
  white-space: nowrap;
}

/* Навигация */
.rmk-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rmk-nav__item {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 42px;
  padding: 0 12px;
  border-radius: var(--rmk-radius-sm);
  color: var(--rmk-gray-600);
  font-size: 14px;
  font-weight: 500;
  transition: background .15s ease, color .15s ease;
}

.rmk-nav__item:hover {
  background: var(--rmk-gray-100);
}

.rmk-nav__item--active {
  background: var(--rmk-primary-100);
  color: var(--rmk-primary-700);
  font-weight: 600;
}

.rmk-nav__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: currentColor;
}

.rmk-nav__item--has-sub {
  cursor: pointer;
}

.rmk-nav__chevron {
  margin-left: auto;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: currentColor;
  transition: transform .25s ease;
}

.rmk-nav__item--has-sub[aria-expanded="true"] .rmk-nav__chevron {
  transform: rotate(180deg);
}

.rmk-nav__sub {
  overflow: hidden;
}

.rmk-nav__sub-item {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 36px;
  padding: 0 12px 0 44px;
  border-radius: var(--rmk-radius-sm);
  color: var(--rmk-gray-600);
  font-size: 13px;
  transition: background .15s ease, color .15s ease;
}

.rmk-nav__sub-item:hover {
  background: var(--rmk-gray-100);
  color: var(--rmk-primary-700);
}

.rmk-nav__sub-item--active {
  color: var(--rmk-primary-700);
  font-weight: 600;
}

/* ---------- Хедер ---------- */
.rmk-header {
  height: 64px;
  flex-shrink: 0;
  background: var(--rmk-white);
  border-bottom: 1px solid var(--rmk-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.rmk-header__left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.rmk-header__icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--rmk-primary-500);
  color: var(--rmk-white);
  display: flex;
  align-items: center;
  justify-content: center;
}

.rmk-header__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--rmk-gray-900);
}

/* Вариант Б: заголовок урока в капсуле */
.rmk-header__title--capsule {
  font-size: 15px;
  font-weight: 600;
  color: var(--rmk-primary-700);
  background: var(--rmk-primary-100);
  border: 1px solid var(--rmk-primary-100);
  border-radius: var(--rmk-radius-pill);
  padding: 7px 18px;
  max-width: 720px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rmk-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.rmk-icon-btn {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--rmk-gray-100);
  color: var(--rmk-gray-600);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s ease, color .15s ease;
}

.rmk-icon-btn:hover {
  background: var(--rmk-gray-200);
  color: var(--rmk-gray-900);
}

.rmk-icon-btn__avatar {
  background: var(--rmk-primary-500);
  color: var(--rmk-white);
}

.rmk-icon-btn__avatar:hover {
  background: var(--rmk-primary-700);
  color: var(--rmk-white);
}

/* ---------- Заголовки секций ---------- */
.rmk-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.rmk-section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--rmk-gray-900);
}

.rmk-section-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--rmk-primary-700);
}

.rmk-section-link:hover {
  text-decoration: underline;
}

/* ---------- Футер ---------- */
.rmk-footer {
  background: var(--rmk-footer-navy);
  color: var(--rmk-white);
  margin-top: auto;
}

.rmk-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding: 48px 32px 32px;
}

.rmk-footer__brand-name {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .03em;
  margin-bottom: 14px;
  color: var(--rmk-white);
}

.rmk-footer__desc {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .7);
  max-width: 340px;
  margin-bottom: 20px;
}

.rmk-footer__socials {
  display: flex;
  gap: 10px;
}

.rmk-footer__social {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .12);
  color: var(--rmk-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s ease;
}

.rmk-footer__social:hover {
  background: var(--rmk-primary-500);
}

.rmk-footer__col-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--rmk-white);
}

.rmk-footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rmk-footer__link {
  font-size: 13px;
  color: rgba(255, 255, 255, .7);
  transition: color .15s ease;
}

.rmk-footer__link:hover {
  color: var(--rmk-white);
}

.rmk-footer__contacts {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.rmk-footer__contact {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, .7);
}

.rmk-footer__contact-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--rmk-accent-orange-600);
  margin-top: 2px;
}

.rmk-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: rgba(255, 255, 255, .55);
}

/* ---------- Layout страницы урока ---------- */
.rmk-lesson-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.rmk-lesson-main {
  flex: 1;
  min-width: 0;
}

.rmk-lesson-panel {
  width: 300px;
  flex-shrink: 0;
  background: var(--rmk-white);
  border: 1px solid var(--rmk-gray-200);
  border-radius: var(--rmk-radius-lg);
  box-shadow: var(--rmk-shadow-card);
  overflow: hidden;
}

.rmk-lesson-panel__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--rmk-gray-900);
  padding: 16px 18px;
  border-bottom: 1px solid var(--rmk-gray-200);
}