/* =========================
   LESSON MENU - isolated test component
========================= */

body.lesson-menu-is-open {
  overflow: hidden;
}

.lesson-menu-trigger {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 1225;

  width: 44px;
  height: 44px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;

  background: rgba(13, 29, 43, 0.88);
  color: var(--yellow);

  font-family: inherit;
  font-size: 23px;
  line-height: 1;
  font-weight: 700;

  cursor: pointer;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);

  transition:
    transform 0.18s ease,
    background 0.18s ease,
    border-color 0.18s ease;
}

.lesson-menu-trigger:hover,
.lesson-menu-trigger:focus-visible {
  background: rgba(22, 47, 69, 0.96);
  border-color: rgba(255, 225, 68, 0.48);
  transform: translateY(-1px);
}

.lesson-menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 1190;

  background: rgba(0, 0, 0, 0.46);

  opacity: 0;
  pointer-events: none;

  transition: opacity 0.22s ease;
}

body.lesson-menu-is-open .lesson-menu-overlay {
  opacity: 1;
  pointer-events: auto;
}

.lesson-menu-panel {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 1210;

  width: min(400px, 90vw);
  max-height: 100vh;

  display: flex;
  flex-direction: column;
  gap: 22px;

  padding: 28px;
  overflow-y: auto;

  background:
    linear-gradient(180deg, rgba(22, 47, 69, 0.98), rgba(11, 24, 36, 0.98));
  color: rgba(255, 255, 255, 0.9);

  border-right: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 26px 0 70px rgba(0, 0, 0, 0.34);

  transform: translateX(-104%);
  transition: transform 0.24s ease;
}

body.lesson-menu-is-open .lesson-menu-panel {
  transform: translateX(0);
}

.lesson-menu-close {
  position: sticky;
  top: 0;
  z-index: 1235;

  width: 42px;
  height: 42px;
  margin-left: auto;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;

  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.88);

  font-family: inherit;
  font-size: 24px;
  line-height: 1;

  cursor: pointer;
}

.lesson-menu-close:hover,
.lesson-menu-close:focus-visible {
  border-color: rgba(255, 225, 68, 0.5);
  color: var(--yellow);
}

.lesson-menu-header {
  display: grid;
  gap: 10px;
}

.lesson-menu-label,
.lesson-menu-counter {
  margin: 0;
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.lesson-menu-title {
  margin: 0;
  color: #fff;
  font-size: 34px;
  line-height: 0.98;
  font-weight: 750;
  text-transform: uppercase;
}

.lesson-menu-counter {
  color: var(--yellow);
  letter-spacing: 0.08em;
}

.lesson-menu-progress {
  width: 100%;
  height: 9px;
  margin-top: 4px;

  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
}

.lesson-menu-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--yellow);
}

.lesson-menu-list {
  display: grid;
  gap: 9px;
}

.lesson-menu-item {
  min-height: 52px;

  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;

  padding: 12px 14px;

  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;

  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
}

.lesson-menu-item--current {
  border-color: rgba(255, 225, 68, 0.56);
  background: rgba(255, 225, 68, 0.12);
  color: #fff;
}

.lesson-menu-item--locked {
  opacity: 0.46;
  cursor: not-allowed;
}

.lesson-menu-item--locked .lesson-menu-item-status {
  position: relative;
  width: 18px;
  height: 18px;
  font-size: 0;
}

.lesson-menu-item--locked .lesson-menu-item-status::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 10px;
  height: 8px;
  border: 2px solid rgba(255, 255, 255, 0.62);
  border-radius: 2px;
}

.lesson-menu-item--locked .lesson-menu-item-status::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 7px;
  border: 2px solid rgba(255, 255, 255, 0.62);
  border-bottom: 0;
  border-radius: 7px 7px 0 0;
}

.lesson-menu-item-number,
.lesson-menu-item-status {
  color: rgba(255, 225, 68, 0.78);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-menu-item-title {
  min-width: 0;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.22;
}

.lesson-menu-item-status {
  color: rgba(255, 255, 255, 0.58);
}

.lesson-menu-footer {
  display: grid;
  gap: 10px;
  margin-top: auto;
  padding-top: 8px;
}

.lesson-menu-user,
.lesson-menu-platform-link {
  min-height: 46px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: 12px 16px;
  border-radius: 999px;

  font-size: 14px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

.lesson-menu-user {
  background: var(--yellow);
  color: #111;
}

.lesson-menu-platform-link {
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.82);
}

.lesson-hero-grid--single {
  grid-template-columns: minmax(0, 1fr);
  justify-items: center;
}

.lesson-hero-grid--single .lesson-hero-left {
  width: 100%;
  max-width: 760px;
  text-align: center;
}

.lesson-hero-grid--single .lesson-hero-left h1 {
  width: 100%;
  max-width: none;
  margin: 0 auto 28px;
  text-align: center;
}

.lesson-hero-grid--single .lesson-description {
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 768px) {
  .lesson-menu-trigger {
    top: 14px;
    left: 14px;
    width: 42px;
    height: 42px;
  }

  .lesson-menu-panel {
    width: min(360px, 90vw);
    padding: 22px 18px;
  }

  .lesson-menu-title {
    font-size: 30px;
  }

  .lesson-menu-item {
    min-height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-menu-trigger,
  .lesson-menu-overlay,
  .lesson-menu-panel {
    transition: none;
  }
}