/* /courses/lesson: flat, square, readable */
.ls2-wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.ls2-page {
  background-color: #fff;
  background-image:
    linear-gradient(rgba(11,61,46,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11,61,46,.045) 1px, transparent 1px);
  background-size: 44px 44px;
  padding-bottom: 88px;
}
.ls2-head { background: #f2f8f5; border-bottom: 1px solid #d5e2dc; padding: 38px 0 30px; }
.ls2-crumb { font-size: 14px; color: #566a63; margin-bottom: 14px; line-height: 1.6; }
.ls2-crumb a { color: #0B3D2E; text-decoration: none; border-bottom: 1px solid #cfeade; }
.ls2-head h1 { margin: 0 0 14px; font-size: clamp(28px, 3.6vw, 42px); line-height: 1.15; font-weight: 600; letter-spacing: -.02em; color: #0B3D2E; max-width: 860px; }
.ls2-meta { font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: #1A9E72; }
.ls2-bar { height: 4px; background: #d5e2dc; margin-top: 20px; max-width: 360px; }
.ls2-bar i { display: block; height: 100%; background: #1A9E72; }

.ls2-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 40px; padding-top: 44px; align-items: start; }
.ls2-body { background: #fff; border: 1px solid #d5e2dc; padding: 44px 48px; }
.ls2-body p { margin: 0 0 22px; font-size: 18px; line-height: 1.8; color: #2c3f38; max-width: 720px; }
.ls2-body p:last-child { margin-bottom: 0; }
.ls2-extra { margin-top: 36px; }

.ls2-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.ls2-nav a { display: block; padding: 18px 22px; border: 1px solid #d5e2dc; background: #fff; text-decoration: none; color: #0B3D2E; font-weight: 600; line-height: 1.4; }
.ls2-nav a:hover { border-color: #1A9E72; }
.ls2-nav small { display: block; margin-bottom: 4px; font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: #8aa098; }
.ls2-nav .next { grid-column: 2; text-align: right; background: #1A9E72; border-color: #1A9E72; color: #fff; }
.ls2-nav .next small { color: rgba(255,255,255,.78); }
.ls2-nav .next:hover { background: #20b585; }

.ls2-side { background: #fff; border: 1px solid #d5e2dc; position: sticky; top: 90px; }
.ls2-side h2 { margin: 0; padding: 18px 20px; font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: #0B3D2E; border-bottom: 1px solid #d5e2dc; background: #f2f8f5; }
.ls2-item { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 4px 10px; padding: 14px 20px; border-bottom: 1px solid #e5eee9; text-decoration: none; color: #2c3f38; border-left: 3px solid transparent; }
.ls2-item:last-child { border-bottom: 0; }
.ls2-item:hover { background: #f7fbf9; }
.ls2-item.is-current { background: #e8f6f0; border-left-color: #1A9E72; }
.ls2-n { font-size: 13px; font-weight: 700; color: #1A9E72; padding-top: 2px; }
.ls2-t { font-size: 15px; line-height: 1.4; font-weight: 500; }
.ls2-item.is-current .ls2-t { font-weight: 600; color: #0B3D2E; }
.ls2-m { grid-column: 2; font-size: 12px; color: #8aa098; letter-spacing: .04em; }

.ls2-lock { background: #fff; border: 1px solid #d5e2dc; padding: 56px 40px; text-align: center; }
.ls2-lock h2 { margin: 0 0 10px; font-size: 26px; font-weight: 600; color: #0B3D2E; }
.ls2-lock p { margin: 0 auto 26px; max-width: 480px; font-size: 17px; line-height: 1.65; color: #566a63; }
.ls2-lock a { display: inline-block; padding: 14px 28px; background: #1A9E72; color: #fff; font-weight: 600; text-decoration: none; }
.ls2-lock a:hover { background: #20b585; }

@media (max-width: 900px) {
  .ls2-layout { grid-template-columns: 1fr; gap: 28px; padding-top: 28px; }
  .ls2-side { position: static; }
  .ls2-body { padding: 28px 22px; }
  .ls2-body p { font-size: 17px; }
  .ls2-nav { grid-template-columns: 1fr; }
  .ls2-nav .next { grid-column: 1; }
}

/* lesson-top-v1: keep the breadcrumb clear of the fixed menu bar */
html body .ls2-head { padding-top: calc(var(--nav-h, 66px) + 38px) !important; }