/* ============================================
   COURS / LMS LAYOUT
   ============================================ */

.cours-page {
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.cours-page nav {
  flex-shrink: 0;
}

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 340px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 90;
  display: flex;
  flex-direction: column;
  transition: transform var(--duration-slow) var(--ease-out), width var(--duration-slow) var(--ease-out);
  padding-top: 72px;
}

.sidebar.collapsed {
  transform: translateX(-340px);
}

.sidebar__toggle {
  position: absolute;
  top: 80px;
  right: -44px;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 91;
  transition: all var(--duration-base) var(--ease-out);
  box-shadow: var(--shadow-sm);
}

.sidebar__toggle:hover {
  background: var(--bg);
  box-shadow: var(--shadow-md);
}

.sidebar__toggle-icon {
  width: 18px;
  height: 18px;
  stroke: var(--text-secondary);
  transition: transform var(--duration-base);
}

.sidebar.collapsed .sidebar__toggle-icon {
  transform: rotate(90deg);
}

/* Sidebar content */
.sidebar__content {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar__header {
  padding: 24px 24px 16px;
  border-bottom: 1px solid var(--divider);
}

.sidebar__header h3 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 6px;
}

.sidebar__progress {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 400;
}

/* Chapters */
.sidebar__chapters {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.sidebar__chapter {
  border-bottom: 1px solid var(--divider);
}

.sidebar__chapter-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-align: left;
  cursor: pointer;
  transition: all var(--duration-base);
  background: none;
  border: none;
  font-family: inherit;
}

.sidebar__chapter-btn:hover {
  color: var(--text);
  background: var(--bg);
}

.sidebar__chapter-arrow {
  width: 16px;
  height: 16px;
  stroke: var(--text-tertiary);
  transition: transform var(--duration-base) var(--ease-out);
  flex-shrink: 0;
}

.sidebar__chapter.open .sidebar__chapter-arrow {
  transform: rotate(180deg);
}

/* Modules list */
.sidebar__modules {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-out);
}

.sidebar__chapter.open .sidebar__modules {
  max-height: 600px;
}

.sidebar__module {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 24px 12px 32px;
  cursor: pointer;
  transition: all var(--duration-base);
  background: none;
  border: none;
  font-family: inherit;
  text-align: left;
}

.sidebar__module:hover {
  background: var(--bg);
}

.sidebar__module.active {
  background: var(--pink-soft);
}

/* Check circle */
.sidebar__module-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
  transition: all var(--duration-base);
}

.sidebar__module-check svg {
  width: 12px;
  height: 12px;
  stroke: transparent;
  transition: stroke var(--duration-base);
}

.sidebar__module-check.done {
  background: var(--secondary-text);
  border-color: var(--secondary-text);
}

.sidebar__module-check.done svg {
  stroke: var(--white);
}

.sidebar__module.active .sidebar__module-check {
  border-color: var(--secondary-text);
}

/* Module info */
.sidebar__module-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.sidebar__module-title {
  font-size: 13px;
  font-weight: 400;
  color: var(--text);
  line-height: 1.4;
}

.sidebar__module.active .sidebar__module-title {
  font-weight: 500;
  color: var(--secondary-text);
}

.sidebar__module-meta {
  font-size: 11px;
  color: var(--text-tertiary);
  font-weight: 300;
}

/* ── Main content ── */
.cours-main {
  margin-left: 340px;
  flex: 1;
  overflow-y: auto;
  transition: margin-left var(--duration-slow) var(--ease-out);
  padding-top: 72px;
}

.sidebar.collapsed ~ .cours-main,
.cours-main.expanded {
  margin-left: 0;
}

.cours-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 60px 80px;
}

/* ── Module styles ── */
.module__breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  margin-bottom: 32px;
}

.module__breadcrumb svg {
  width: 14px;
  height: 14px;
  stroke: var(--text-tertiary);
}

.module__breadcrumb span:last-child {
  color: var(--secondary-text);
  font-weight: 500;
}

.module__header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--divider);
}

.module__type {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--secondary-text);
  display: inline-block;
  background: var(--pink-soft);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.module__header h1 {
  font-size: clamp(28px, 3.5vw, 38px);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--text);
}

.module__intro {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.85;
  font-weight: 300;
  max-width: 640px;
}

/* Body sections */
.module__section {
  margin-bottom: 40px;
}

.module__section h2 {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 16px;
  padding-left: 16px;
  border-left: 3px solid var(--primary-soft);
}

.module__text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
  font-weight: 300;
}

.module__text p {
  margin-bottom: 12px;
}

.module__text li {
  padding: 4px 0 4px 20px;
  position: relative;
}

.module__text li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 13px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary-soft);
}

/* Key points */
.module__keypoints {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 48px 0;
}

.module__keypoints h3 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--secondary-text);
  margin-bottom: 16px;
}

.module__keypoints ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module__keypoints li {
  font-size: 14px;
  color: var(--text);
  font-weight: 400;
  line-height: 1.6;
  padding-left: 28px;
  position: relative;
}

.module__keypoints li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary-soft);
  opacity: 0.5;
}

.module__keypoints li::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--secondary-text);
}

/* Actions bar */
.module__actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid var(--divider);
}

.module__nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  padding: 10px 18px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  background: none;
  font-family: inherit;
}

.module__nav-btn svg {
  width: 16px;
  height: 16px;
}

.module__nav-btn:hover {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--bg);
}

.module__complete-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--secondary);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  font-family: inherit;
}

.module__complete-btn svg {
  width: 16px;
  height: 16px;
}

.module__complete-btn:hover {
  background: var(--secondary-variant);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.module__complete-btn.completed {
  background: var(--secondary-text);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .sidebar { width: 300px; }
  .cours-main { margin-left: 300px; }
  .sidebar.collapsed ~ .cours-main,
  .cours-main.expanded { margin-left: 0; }
  .cours-content { padding: 36px 40px 60px; }
}

@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    transform: translateX(-100%);
  }

  .sidebar:not(.collapsed) {
    transform: translateX(0);
  }

  .sidebar.collapsed {
    transform: translateX(-100%);
  }

  /* On mobile, sidebar is collapsed by default */
  .cours-main {
    margin-left: 0;
  }

  .sidebar__toggle {
    right: -44px;
  }

  .cours-content {
    padding: 24px 20px 60px;
  }

  .module__header h1 { font-size: 24px; }
  .module__actions { flex-direction: column; }
  .module__nav-btn { width: 100%; justify-content: center; }
  .module__complete-btn { width: 100%; justify-content: center; }
}