/* ============================================================
   codencode.my LMS — "Learn" focus mode
   Lesson viewer + practice/drill screens.
   Self-contained --lrn-* token namespace so it is immune to
   lms-skin.css and the base <style>. The theme toggle is scoped
   to #learn-shell[data-theme] so leaving the focus mode never
   restyles the (always-light) dashboard.
   ============================================================ */

/* ---- tokens: dark (default / screenshots) ---------------- */
:root,
:root[data-theme="dark"],
#learn-shell,
#learn-shell[data-theme="dark"] {
  --lrn-bg:        #0a0f0d;
  --lrn-bg-grad:   radial-gradient(circle at 12% -8%, rgba(16,205,167,.10), transparent 40%),
                   linear-gradient(160deg, #0a0f0d 0%, #0c1411 55%, #0a0f0d 100%);
  --lrn-surface:   #111814;
  --lrn-surface-2: #0e1512;
  --lrn-media:     #060a08;
  --lrn-border:    #1f2b25;
  --lrn-border-2:  #29382f;
  --lrn-text:      #E8EFEA;
  --lrn-text-2:    #9fb0a6;
  --lrn-text-3:    #6b7d73;
  --lrn-accent:    #14C08A;
  --lrn-accent-2:  #10CDA7;
  --lrn-accent-bg: rgba(20,192,138,.12);
  --lrn-accent-brd:rgba(20,192,138,.55);
  --lrn-amber:     #E0A64B;
  --lrn-amber-bg:  rgba(224,166,75,.12);
  --lrn-red:       #E06B6B;
  --lrn-red-bg:    rgba(224,107,107,.12);
  --lrn-track:     #1c2721;
  --lrn-shadow:    0 24px 60px rgba(0,0,0,.45);
}

/* ---- tokens: light -------------------------------------- */
:root[data-theme="light"],
#learn-shell[data-theme="light"] {
  --lrn-bg:        #F0F1F3;
  --lrn-bg-grad:   radial-gradient(circle at 10% -5%, rgba(15,157,88,.12), transparent 34%),
                   linear-gradient(135deg, #F0F1F3 0%, #F7FAF8 48%, #FFFFFF 100%);
  --lrn-surface:   #ffffff;
  --lrn-surface-2: #FAFCFB;
  --lrn-media:     #0d1414;
  --lrn-border:    #ECEDEF;
  --lrn-border-2:  #DDE9E3;
  --lrn-text:      #14181B;
  --lrn-text-2:    #5c6b62;
  --lrn-text-3:    #97a49b;
  --lrn-accent:    #0F9D58;
  --lrn-accent-2:  #0B7A43;
  --lrn-accent-bg: #E6F6EC;
  --lrn-accent-brd:#0F9D58;
  --lrn-amber:     #B9660B;
  --lrn-amber-bg:  #FFF2D7;
  --lrn-red:       #C0392B;
  --lrn-red-bg:    #FBEAE8;
  --lrn-track:     #E3E7E5;
  --lrn-shadow:    0 20px 44px rgba(20,24,27,.12);
}

/* ---- shell --------------------------------------------- */
#learn-shell {
  position: fixed; inset: 0; z-index: 60;
  background: var(--lrn-bg);
  background-image: var(--lrn-bg-grad);
  color: var(--lrn-text);
  font-family: 'Inter', sans-serif;
  overflow-y: auto;
}
#learn-shell[hidden] { display: none !important; }

.lrn-topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 22px;
  padding: 14px 26px;
  background: color-mix(in srgb, var(--lrn-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--lrn-border);
}
.lrn-brand { display: flex; align-items: center; text-decoration: none; flex-shrink: 0; }
.lrn-logo { height: 22px; width: auto; display: block; }
.lrn-logo-dark { display: none; }
#learn-shell[data-theme="dark"] .lrn-logo-light { display: none; }
#learn-shell[data-theme="dark"] .lrn-logo-dark { display: block; }
@media (max-width: 640px){ .lrn-logo { height: 19px; } }
.lrn-nav { display: flex; gap: 4px; background: var(--lrn-surface-2); border: 1px solid var(--lrn-border); border-radius: 12px; padding: 4px; }
.lrn-nav button {
  border: 0; background: none; cursor: pointer;
  font: 500 13px 'Inter', sans-serif; color: var(--lrn-text-2);
  padding: 7px 15px; border-radius: 9px;
}
.lrn-nav button:hover { color: var(--lrn-text); }
.lrn-nav button.on { background: var(--lrn-accent-bg); color: var(--lrn-accent); }
.lrn-topbar-right { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.lrn-icon-btn {
  width: 34px; height: 34px; border-radius: 9px; border: 1px solid var(--lrn-border);
  background: var(--lrn-surface-2); color: var(--lrn-text-2); cursor: pointer;
  display: grid; place-items: center; font-size: 14px;
}
.lrn-icon-btn:hover { color: var(--lrn-text); border-color: var(--lrn-border-2); }
/* theme toggle: pill with a label so it reads as a control */
.lrn-theme-toggle {
  width: auto; height: 34px; padding: 0 12px; gap: 7px;
  display: inline-flex; align-items: center;
  color: var(--lrn-text); font: 600 12px 'Inter', sans-serif; white-space: nowrap;
}
.lrn-theme-toggle i { font-size: 13px; color: var(--lrn-accent); }
.lrn-user span { white-space: nowrap; }
@media (max-width: 640px){ .lrn-theme-toggle span { display: none; } .lrn-theme-toggle { width: 34px; padding: 0; } }
.lrn-user { display: flex; align-items: center; gap: 9px; font-size: 13px; color: var(--lrn-text-2); }
.lrn-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, #12A862, #0B7A43);
  color: #fff; display: grid; place-items: center; font-size: 12px; font-weight: 600;
}

.lrn-stage { max-width: 1360px; margin: 0 auto; padding: 26px; }
@media (max-width: 640px){ .lrn-stage { padding: 16px; } .lrn-topbar { gap: 12px; padding: 12px 14px; } .lrn-user span { display: none; } }

/* ---- generic bits -------------------------------------- */
.lrn-eyebrow { font: 500 12px 'JetBrains Mono', monospace; color: var(--lrn-accent); letter-spacing: .04em; }
.lrn-back {
  display: inline-flex; align-items: center; gap: 6px; margin-bottom: 18px;
  background: none; border: 0; cursor: pointer;
  font: 600 13px 'Inter', sans-serif; color: var(--lrn-text-2);
}
.lrn-back:hover { color: var(--lrn-text); }
.lrn-empty { padding: 60px 20px; text-align: center; color: var(--lrn-text-3); font-size: 13px; }

/* ---- outline (session list) --------------------------- */
.lrn-sess { margin-bottom: 28px; }
.lrn-sess-head { display: flex; align-items: baseline; gap: 12px; font: 700 16px 'Outfit','Inter',sans-serif; margin-bottom: 14px; }
.lrn-sess-count { font: 500 12px 'JetBrains Mono', monospace; color: var(--lrn-text-3); }
.lrn-sess-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }
.lrn-card {
  display: flex; gap: 14px; align-items: center; text-align: left; cursor: pointer;
  background: var(--lrn-surface); border: 1px solid var(--lrn-border);
  border-radius: 14px; padding: 15px 16px; box-shadow: var(--lrn-shadow);
}
.lrn-card:hover { border-color: var(--lrn-border-2); }
.lrn-card-ic {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 12px;
  background: var(--lrn-accent-bg); color: var(--lrn-accent);
  display: grid; place-items: center; font-size: 17px;
}
.lrn-card.drill .lrn-card-ic { background: var(--lrn-amber-bg); color: var(--lrn-amber); }
.lrn-card-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.lrn-card-kicker { font: 500 11px 'Inter', sans-serif; color: var(--lrn-text-3); }
.lrn-card-title { font: 600 14px/1.4 'Inter', sans-serif; color: var(--lrn-text); }
.lrn-card-prog { display: flex; align-items: center; gap: 8px; margin-top: 4px; }
.lrn-tag {
  display: inline-flex; align-items: center; gap: 5px; width: fit-content; margin-top: 4px;
  font: 700 11px 'Inter', sans-serif; color: var(--lrn-amber);
  background: var(--lrn-amber-bg); padding: 4px 9px; border-radius: 20px;
}
.lrn-tag.ok { color: var(--lrn-accent); background: var(--lrn-accent-bg); }

/* ============ LESSON VIEWER ============ */
.lrn-lesson { display: grid; grid-template-columns: 1fr 340px; gap: 22px; align-items: start; }
@media (max-width: 1000px){ .lrn-lesson { grid-template-columns: 1fr; } .lrn-rail { order: 1; } }

.lrn-media {
  width: 100%; aspect-ratio: 16 / 9; border-radius: 16px; overflow: hidden;
  background: var(--lrn-media); border: 1px solid var(--lrn-border);
  position: relative;
}
.lrn-media iframe, .lrn-media img { width: 100%; height: 100%; border: 0; display: block; object-fit: contain; background: var(--lrn-media); }
.lrn-media-tag {
  position: absolute; right: 12px; bottom: 12px;
  font: 500 12px 'JetBrains Mono', monospace; color: #cfe;
  background: rgba(0,0,0,.55); padding: 3px 8px; border-radius: 6px;
}
.lrn-slidenav { display: flex; align-items: center; justify-content: space-between; margin: 14px 0 8px; }
.lrn-slidenav button {
  width: 34px; height: 34px; border-radius: 10px; border: 0; cursor: pointer;
  background: var(--lrn-surface-2); color: var(--lrn-text-2); font-size: 15px;
}
.lrn-slidenav button:disabled { opacity: .35; cursor: not-allowed; }
.lrn-slidenav button:not(:disabled):hover { background: var(--lrn-accent-bg); color: var(--lrn-accent); }
.lrn-slidenav .count { font: 500 12px 'JetBrains Mono', monospace; color: var(--lrn-text-3); }

.lrn-h1 { font: 700 24px/1.3 'Outfit', 'Inter', sans-serif; letter-spacing: -.01em; margin: 14px 0 10px; }
.lrn-meta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 22px; }
.lrn-meta span { font-size: 12px; color: var(--lrn-text-3); display: inline-flex; align-items: center; gap: 6px; }

.lrn-tabs { display: flex; gap: 22px; border-bottom: 1px solid var(--lrn-border); margin-bottom: 18px; }
.lrn-tabs button {
  border: 0; background: none; cursor: pointer; padding: 0 0 10px;
  font: 500 13px 'Inter', sans-serif; color: var(--lrn-text-3);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.lrn-tabs button.on { color: var(--lrn-accent); border-bottom-color: var(--lrn-accent); }

.lrn-transcript .line { display: flex; gap: 12px; font-size: 14px; line-height: 1.7; color: var(--lrn-text-2); margin-bottom: 12px; }
.lrn-transcript .line b { font: 500 11px 'JetBrains Mono', monospace; color: var(--lrn-text-3); flex-shrink: 0; padding-top: 3px; }
.lrn-callout {
  display: flex; gap: 10px; align-items: flex-start;
  background: var(--lrn-accent-bg); color: var(--lrn-accent);
  border-radius: 14px; padding: 15px 17px; margin-bottom: 20px;
  font-size: 14px; font-weight: 500; line-height: 1.6;
}
.lrn-note-area {
  width: 100%; min-height: 160px; resize: vertical;
  background: var(--lrn-surface-2); border: 1px solid var(--lrn-border);
  border-radius: 12px; padding: 14px; color: var(--lrn-text);
  font: 400 14px/1.6 'Inter', sans-serif;
}
.lrn-res-row { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--lrn-border); }
.lrn-res-row:first-child { border-top: 0; }
.lrn-res-row a { color: var(--lrn-accent); font-size: 13px; font-weight: 600; text-decoration: none; }

/* right rail */
.lrn-rail { background: var(--lrn-surface); border: 1px solid var(--lrn-border); border-radius: 18px; padding: 20px; box-shadow: var(--lrn-shadow); }
.lrn-rail-title { font: 700 13px 'Outfit', 'Inter', sans-serif; letter-spacing: .02em; margin-bottom: 12px; }
.lrn-rail-item {
  display: flex; gap: 11px; align-items: center; padding: 9px 8px; border-radius: 11px;
  cursor: pointer; font-size: 13px;
}
.lrn-rail-item:hover { background: var(--lrn-surface-2); }
.lrn-rail-item.on { background: var(--lrn-accent-bg); }
.lrn-rail-item.on .lrn-rail-name { color: var(--lrn-text); font-weight: 600; }
.lrn-rail-item.done .lrn-rail-name { color: var(--lrn-text-3); }
.lrn-rail-name { color: var(--lrn-text-2); }
.lrn-check {
  width: 20px; height: 20px; border-radius: 50%; flex-shrink: 0;
  border: 1.5px solid var(--lrn-border-2); display: grid; place-items: center;
  font: 600 10px 'Inter', sans-serif; color: var(--lrn-text-3);
}
.lrn-check.done { background: var(--lrn-accent); border-color: var(--lrn-accent); color: #04120c; }
.lrn-check.on { border-color: var(--lrn-accent); color: var(--lrn-accent); }
.lrn-rail-divider { height: 1px; background: var(--lrn-border); margin: 16px 0; }
.lrn-rail-sub { font: 600 11px 'Inter', sans-serif; letter-spacing: .04em; text-transform: uppercase; color: var(--lrn-text-3); margin-bottom: 8px; }

.lrn-btn {
  width: 100%; border: 0; cursor: pointer; border-radius: 12px;
  font: 600 13px 'Inter', sans-serif; padding: 12px 16px; margin-top: 6px;
  background: var(--lrn-accent); color: #04120c;
}
.lrn-btn:hover { background: var(--lrn-accent-2); color: #fff; }
.lrn-btn.ghost { background: var(--lrn-surface-2); color: var(--lrn-text); border: 1px solid var(--lrn-border); }
.lrn-btn.ghost:hover { border-color: var(--lrn-border-2); background: var(--lrn-surface); }
.lrn-btn:disabled { opacity: .5; cursor: default; }

/* ============ PRACTICE / DRILL ============ */
.lrn-practice { max-width: 680px; margin: 0 auto; }
.lrn-prog-row { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.lrn-prog-track { flex: 1; height: 6px; background: var(--lrn-track); border-radius: 20px; overflow: hidden; }
.lrn-prog-fill { height: 100%; background: var(--lrn-accent); border-radius: 20px; transition: width .3s; }
.lrn-prog-label { font: 500 12px 'JetBrains Mono', monospace; color: var(--lrn-text-3); white-space: nowrap; }

.lrn-drill-eyebrow { font: 500 11.5px 'JetBrains Mono', monospace; color: var(--lrn-amber); margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }
.lrn-drill-q { font: 700 21px/1.4 'Outfit', 'Inter', sans-serif; letter-spacing: -.01em; margin-bottom: 8px; }
.lrn-drill-sub { font-size: 13px; color: var(--lrn-text-2); margin-bottom: 22px; line-height: 1.6; }
.lrn-code {
  background: var(--lrn-surface-2); border: 1px solid var(--lrn-border);
  border-radius: 12px; padding: 16px 18px; margin-bottom: 22px;
  font: 500 13px/1.55 'JetBrains Mono', monospace; color: var(--lrn-text); white-space: pre-wrap;
}
.lrn-code .k { color: var(--lrn-accent); }

.lrn-opt {
  display: flex; align-items: center; gap: 14px;
  border: 1.5px solid var(--lrn-border); border-radius: 14px;
  padding: 15px 18px; margin-bottom: 10px; cursor: pointer;
  transition: border-color .12s, background .12s;
}
.lrn-opt:hover { border-color: var(--lrn-accent-brd); background: var(--lrn-accent-bg); }
.lrn-opt.sel { border-color: var(--lrn-accent); background: var(--lrn-accent-bg); }
.lrn-opt.correct { border-color: var(--lrn-accent); background: var(--lrn-accent-bg); }
.lrn-opt.wrong { border-color: var(--lrn-red); background: var(--lrn-red-bg); }
.lrn-opt.lock { cursor: default; }
.lrn-opt-letter {
  width: 26px; height: 26px; flex-shrink: 0; border-radius: 8px;
  border: 1.5px solid var(--lrn-border-2); display: grid; place-items: center;
  font: 600 12px 'JetBrains Mono', monospace; color: var(--lrn-text-3);
}
.lrn-opt.sel .lrn-opt-letter,
.lrn-opt.correct .lrn-opt-letter { border-color: var(--lrn-accent); color: var(--lrn-accent); background: var(--lrn-surface); }
.lrn-opt.wrong .lrn-opt-letter { border-color: var(--lrn-red); color: var(--lrn-red); background: var(--lrn-surface); }
.lrn-opt-text { font: 500 14px/1.5 'JetBrains Mono', monospace; color: var(--lrn-text); }

.lrn-drill-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 26px; }
.lrn-skip { font-size: 13px; color: var(--lrn-text-3); cursor: pointer; }
.lrn-skip:hover { color: var(--lrn-text-2); }
.lrn-submit {
  border: 0; cursor: pointer; border-radius: 12px;
  font: 600 13px 'Inter', sans-serif; padding: 12px 22px;
  background: var(--lrn-accent); color: #04120c;
}
.lrn-submit:hover { background: var(--lrn-accent-2); color: #fff; }
.lrn-submit:disabled { opacity: .45; cursor: default; }
.lrn-feedback {
  display: flex; align-items: center; gap: 10px; margin-top: 20px;
  border-radius: 12px; padding: 14px 16px; font: 600 13px 'Inter', sans-serif;
}
.lrn-feedback.pass { background: var(--lrn-accent-bg); color: var(--lrn-accent); }
.lrn-feedback.fail { background: var(--lrn-red-bg); color: var(--lrn-red); }
.lrn-explain { margin-top: 12px; font-size: 13px; line-height: 1.6; color: var(--lrn-text-2); }