/* ==========================================================================
   Workspace shell — sidebar, breadcrumbs, drawer, shortcuts sheet.
   body[data-mode="home"] is the landing page (top nav, no sidebar).
   body[data-mode="work"] is everything else (sidebar + breadcrumbs).
   ========================================================================== */

:root { --side-w: 272px; --sidebar: #fafafa; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --sidebar: #151617; } }
:root[data-theme="dark"] { --sidebar: #151617; }

/* ---------- chrome in each mode ---------- */
.crumbs { display: none; }
.side-toggle { display: none; }

body[data-mode="work"] .chrome-in { max-width: none; padding-inline: 16px 18px; }
body[data-mode="work"] .nav { display: none; }
body[data-mode="work"] .brand { margin-right: 0; }
body[data-mode="work"] .crumbs {
  display: flex; align-items: center; gap: 8px; min-width: 0; margin-right: auto;
  font-size: var(--fs-small); color: var(--ink-3); white-space: nowrap; overflow: hidden;
  padding-left: 16px; border-left: 1px solid var(--line-2); height: 22px;
}
.crumbs a { color: var(--ink-3); display: inline-flex; gap: 6px; align-items: baseline; }
.crumbs a:hover { color: var(--ink); text-decoration: none; }
.crumbs-sep { color: var(--ink-4); opacity: .7; }
.crumbs-here { color: var(--ink); font-weight: 500; overflow: hidden; text-overflow: ellipsis; display: inline-flex; gap: 6px; align-items: baseline; min-width: 0; }
.crumbs-code { font-family: var(--mono); font-size: var(--fs-fine); color: var(--ink-4); }

@media (min-width: 1100px) {
  body[data-mode="work"] .side-toggle { display: inline-flex; }
  .nav-toggle { display: none !important; }
}
@media (max-width: 1099px) {
  .nav-toggle { display: inline-flex; }
  .nav { display: none !important; }
  body[data-mode="home"] .brand { margin-right: auto; }
}
@media (max-width: 640px) {
  body[data-mode="work"] .brand-name { display: none; }
  body[data-mode="work"] .crumbs { padding-left: 12px; }
  #btn-help { display: none; }
}

/* ---------- frame ---------- */
.frame { display: block; }
body[data-mode="work"] .foot { display: none; }
body[data-mode="work"] .stage { min-height: calc(100vh - var(--chrome-h)); }

@media (min-width: 1100px) {
  body[data-mode="work"] .frame { display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr); }
  body[data-mode="work"][data-side="hidden"] .frame { grid-template-columns: 0 minmax(0, 1fr); }
  body[data-mode="work"][data-side="hidden"] .side { visibility: hidden; }
}

/* ---------- sidebar ---------- */
.side { display: none; }
body[data-mode="work"] .side,
body[data-drawer="open"] .side {
  display: flex; flex-direction: column;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
}
@media (min-width: 1100px) {
  body[data-mode="work"] .side {
    position: sticky; top: var(--chrome-h);
    height: calc(100vh - var(--chrome-h));
    height: calc(100dvh - var(--chrome-h));
    overflow: hidden;
  }
}
@media (max-width: 1099px) {
  .side, body[data-mode="work"] .side {
    display: flex; flex-direction: column;
    position: fixed; z-index: 420; left: 0; bottom: 0;
    top: calc(var(--chrome-h) + env(safe-area-inset-top, 0px));
    width: min(320px, 88vw);
    background: var(--sidebar); border-right: 1px solid var(--line);
    transform: translateX(-102%); transition: transform var(--t-mid) var(--ease-out);
    box-shadow: var(--lift-3);
  }
  body[data-drawer="open"] .side { transform: none; }
  .side-scrim { position: fixed; inset: calc(var(--chrome-h) + env(safe-area-inset-top, 0px)) 0 0 0; z-index: 410; background: rgba(0,0,0,.28); animation: fadeIn var(--t-fast) ease both; }
}
@media (min-width: 1100px) { .side-scrim { display: none; } }

.side-scroll { flex: 1; min-height: 0; overflow-y: auto; padding: 12px 10px 18px; overscroll-behavior: contain; }

.side-resume {
  display: flex; flex-direction: column; gap: 2px; padding: 11px 12px; margin: 0 2px 14px;
  border: 1px solid var(--line-2); border-radius: var(--r-md); background: var(--surface);
  color: var(--ink); position: relative; overflow: hidden;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.side-resume::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--hue); }
.side-resume:hover { text-decoration: none; border-color: var(--line-strong); box-shadow: var(--lift-1); }
.side-resume-k { font-family: var(--mono); font-size: var(--fs-micro); color: var(--ink-3); }
.side-resume-t { font-size: var(--fs-small); font-weight: 500; line-height: 1.3; }
.side-resume-m { font-family: var(--mono); font-size: var(--fs-micro); color: var(--ink-4); }

.side-group { display: flex; flex-direction: column; gap: 1px; margin-bottom: 16px; }
.side-group h2 {
  margin: 0 0 5px; padding: 0 8px; font-family: var(--mono); font-weight: 400;
  font-size: var(--fs-micro); color: var(--ink-4); letter-spacing: 0; line-height: 1.5; text-wrap: wrap;
}

.side-link {
  display: flex; align-items: center; gap: 9px; padding: 6px 8px; border-radius: var(--r-sm);
  color: var(--ink-2); font-size: var(--fs-small); line-height: 1.25;
}
.side-link svg { color: var(--ink-4); flex: none; }
.side-link:hover { background: var(--ground-deep); color: var(--ink); text-decoration: none; }
.side-link[aria-current="page"] { background: var(--surface); color: var(--ink); font-weight: 500; box-shadow: inset 0 0 0 1px var(--line-2); }
.side-link[aria-current="page"] svg { color: var(--ink); }
.side-link-t { flex: 1; min-width: 0; }
.side-kbd {
  font-size: 10px; padding: 0 5px; line-height: 16px; border-radius: 4px;
  opacity: 0; transition: opacity var(--t-fast) var(--ease); white-space: nowrap;
}
.side-link:hover .side-kbd, .side-link:focus-visible .side-kbd { opacity: 1; }
.side-badge {
  font-family: var(--mono); font-size: 10px; line-height: 16px; padding: 0 6px; border-radius: 99px;
  background: var(--ink); color: var(--ground);
}
.side-link:hover .side-badge { display: none; }

/* modules */
.side-mod { border-radius: var(--r-sm); }
.side-mod-bar {
  display: flex; align-items: center; gap: 7px; width: 100%; text-align: left;
  padding: 6px 8px; border-radius: var(--r-sm); color: var(--ink-2); font-size: var(--fs-small);
}
.side-mod-bar:hover { background: var(--ground-deep); color: var(--ink); }
.side-mod[data-here="1"] > .side-mod-bar { color: var(--ink); font-weight: 500; }
.side-n { font-family: var(--mono); font-size: var(--fs-micro); color: var(--ink-4); width: 16px; flex: none; }
.side-chev { color: var(--ink-4); display: inline-flex; transition: transform var(--t-mid) var(--ease); flex: none; }
.side-mod[data-open="1"] .side-chev { transform: rotate(90deg); }
.side-mod-t { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-count { font-family: var(--mono); font-size: var(--fs-micro); color: var(--ink-4); flex: none; }
.side-count[data-done="1"] { color: var(--good-text); }

.side-lessons { display: grid; grid-template-rows: 0fr; transition: grid-template-rows var(--t-mid) var(--ease); }
.side-mod[data-open="1"] .side-lessons { grid-template-rows: 1fr; }
.side-lessons > div { overflow: hidden; display: flex; flex-direction: column; gap: 1px; padding-left: 22px; }
.side-mod[data-open="1"] .side-lessons > div { padding-block: 2px 6px; }

.side-lesson {
  display: flex; align-items: baseline; gap: 7px; padding: 4px 8px; border-radius: var(--r-sm);
  font-size: var(--fs-fine); color: var(--ink-3); line-height: 1.35; position: relative;
}
.side-lesson:hover { background: var(--ground-deep); color: var(--ink); text-decoration: none; }
.side-lesson[aria-current="page"] { background: var(--surface); color: var(--ink); font-weight: 500; box-shadow: inset 0 0 0 1px var(--line-2); }
.side-lesson[aria-current="page"]::before { content: ""; position: absolute; left: -10px; top: 6px; bottom: 6px; width: 2px; border-radius: 2px; background: var(--hue); }
.side-code { font-family: var(--mono); font-size: 10px; color: var(--ink-4); flex: none; }
.side-lesson-t { flex: 1; min-width: 0; }
.side-dot { width: 6px; height: 6px; border-radius: 99px; border: 1px solid var(--line-strong); flex: none; align-self: center; }
.side-lesson[data-s="doing"] .side-dot { border-color: var(--warn); background: var(--warn-soft); }
.side-lesson[data-s="done"] .side-dot { border-color: var(--good); background: var(--good); }

.side-foot {
  display: flex; flex-direction: column; gap: 7px; padding: 11px 16px 13px;
  border-top: 1px solid var(--line); color: var(--ink-3);
}
.side-foot:hover { text-decoration: none; background: var(--ground-deep); }
.side-foot-t { font-family: var(--mono); font-size: var(--fs-micro); }
.side-foot-t b { color: var(--ink); font-weight: 500; }
.side-foot .meter { height: 3px; }
.side-foot .meter > span { background: var(--good); }

/* ---------- shortcuts sheet ---------- */
.keys { position: fixed; inset: 0; z-index: 720; display: grid; place-items: center; padding: 16px; }
.keys-scrim { position: absolute; inset: 0; background: rgba(0,0,0,.34); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); animation: fadeIn var(--t-fast) ease both; }
.keys-box {
  position: relative; width: min(760px, 100%); max-height: calc(100vh - 32px); overflow-y: auto;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--r-lg);
  box-shadow: var(--lift-3); padding: 22px 24px 24px;
  animation: paletteIn var(--t-mid) var(--ease-out) both;
}
.keys-head h2 { font-size: 1.25rem; letter-spacing: -0.01em; }
.keys-head p { margin-top: 6px; color: var(--ink-3); font-size: var(--fs-small); max-width: 60ch; }
.keys-cols { display: grid; gap: 22px; margin-top: 18px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .keys-cols { grid-template-columns: 1fr 1fr; } }
.keys-col h3 { line-height: 1.5; letter-spacing: normal; text-wrap: wrap; margin: 0 0 8px; font-family: var(--mono); font-weight: 400; font-size: var(--fs-fine); color: var(--ink-4); }
.keys-row { display: flex; align-items: center; gap: 12px; padding: 6px 0; border-top: 1px solid var(--line); font-size: var(--fs-small); }
.keys-k { display: inline-flex; gap: 4px; width: 62px; flex: none; }
.keys-k kbd { min-width: 22px; text-align: center; font-size: var(--fs-fine); color: var(--ink-2); }
.keys-w { color: var(--ink-2); }

.foot-keys { display: inline-flex; gap: 6px; align-items: center; color: var(--ink-3); font-size: var(--fs-small); padding: 0; }
.foot-keys:hover { color: var(--ink); }