/* ==========================================================================
   QT Trading Lab — app shell: page ground, sidebar, mobile header and tab bar.
   Markup is rendered by assets/js/qt-shell.js. Requires qt-tokens.css.
   ========================================================================== */

.qt-app,
.qt-app *,
.qt-app *::before,
.qt-app *::after {
  box-sizing: border-box;
}

body.qt-app {
  margin: 0;
  min-height: 100vh;
  background: var(--page-background);
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.qt-app :focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.qt-app ::selection {
  background: color-mix(in srgb, var(--color-accent) 30%, transparent);
}

.qt-layout {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  min-height: 100vh;
}

.qt-main {
  min-width: 0;
}

/* ---- Sidebar ---- */
.qt-sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 24px;
  height: 100vh;
  padding: 20px 14px;
  overflow-y: auto;
  border-right: 1px solid var(--color-divider);
  background: var(--glass-fill-bar);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
}

.qt-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px;
  color: inherit;
  text-decoration: none;
}

.qt-brand img {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: cover;
}

.qt-brand-name {
  display: block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.qt-brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.qt-nav-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.qt-nav-label {
  padding: 0 10px 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.qt-nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
  padding: 7px 10px;
  border-radius: 6px;
  color: var(--color-text-muted);
  font-size: 13.5px;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.qt-nav-link:hover {
  background: color-mix(in srgb, var(--color-text) 7%, transparent);
  color: var(--color-text);
}

.qt-nav-link[aria-current="page"] {
  background: color-mix(in srgb, var(--color-accent) 11%, transparent);
  color: var(--color-text);
}

.qt-nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 2px;
  border-radius: 2px;
  background: var(--color-accent);
}

.qt-nav-meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--color-text-faint);
}

.qt-sidebar-foot {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: auto;
}

.qt-progress-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.qt-progress-card:hover {
  border-color: var(--color-divider-strong);
}

.qt-progress-card-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 11.5px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.qt-progress-card-meta {
  font-size: 11px;
  color: var(--color-text-faint);
}

/* ---- Edge Optimizer link: sidebar, library on phones, landing ---- */
.qt-eo-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface) 55%, transparent);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.qt-eo-card:hover {
  border-color: var(--color-accent-700);
  background: color-mix(in srgb, var(--color-accent) 9%, transparent);
}

.qt-eo-card img {
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.qt-eo-copy {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  line-height: 1.3;
}

.qt-eo-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
}

.qt-eo-sub {
  font-size: 11px;
  color: var(--color-text-faint);
}

.qt-eo-arrow {
  flex: none;
  width: 14px;
  height: 14px;
  color: var(--color-text-faint);
  transition: color 0.15s ease;
}

.qt-eo-card:hover .qt-eo-arrow {
  color: var(--color-accent-300);
}

/* ---- Module list on course pages (filled by course-app.js) ---- */
.qt-course-nav[hidden] {
  display: none;
}

.qt-module-link {
  align-items: flex-start;
  font-size: 12.5px;
  line-height: 1.35;
}

.qt-module-num {
  flex: none;
  width: 18px;
  padding-top: 1px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--color-text-faint);
}

.qt-module-title {
  display: -webkit-box;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.qt-module-link .qt-nav-meta {
  padding-top: 1px;
  font-variant-numeric: tabular-nums;
}

.qt-module-link[aria-current="page"] .qt-module-num,
.qt-module-link.is-done .qt-nav-meta {
  color: var(--color-accent-300);
}

/* ---- Mobile header and tab bar ---- */
.qt-mobilebar,
.qt-tabbar {
  display: none;
}

@media (max-width: 767px) {
  .qt-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .qt-sidebar {
    display: none;
  }

  .qt-mobilebar {
    position: sticky;
    top: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    padding: 12px 18px;
    border-bottom: 1px solid var(--color-divider);
    background: var(--glass-fill-bar);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
  }

  .qt-mobilebar .qt-brand {
    padding: 0;
  }

  .qt-main {
    padding-bottom: calc(56px + env(safe-area-inset-bottom));
  }

  .qt-tabbar {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 40;
    display: flex;
    padding-bottom: env(safe-area-inset-bottom);
    border-top: 1px solid var(--color-divider);
    background: var(--glass-fill-bar);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
  }

  .qt-tab {
    position: relative;
    display: grid;
    flex: 1;
    min-width: 0;
    min-height: 56px;
    place-items: center;
    padding: 0 4px;
    color: var(--color-text-faint);
    font-size: 11.5px;
    text-align: center;
    text-decoration: none;
  }

  .qt-tab[aria-current="page"] {
    color: var(--color-accent-300);
  }

  .qt-tab[aria-current="page"]::before {
    content: "";
    position: absolute;
    top: 0;
    left: 28%;
    right: 28%;
    height: 2px;
    border-radius: 0 0 2px 2px;
    background: var(--color-accent);
  }
}

@media (prefers-reduced-motion: reduce) {
  .qt-nav-link,
  .qt-progress-card {
    transition: none;
  }
}