/* ==========================================================================
   QT Trading Lab — course library (library.html). The landing page (index.html)
   reuses these sections with landing.css.
   Requires qt-tokens.css, qt-components.css, qt-shell.css.
   ========================================================================== */

.lib {
  display: flex;
  flex-direction: column;
  gap: 48px;
  max-width: 1120px;
  padding: 44px 44px 72px;
}

/* ---- Hero ---- */
.lib-hero {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lib-hero h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(34px, 4.6vw, 50px);
  font-weight: var(--font-heading-weight);
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.lib-lede {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  color: var(--color-text-muted);
  text-wrap: pretty;
}

.lib-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 44px;
  margin: 14px 0 0;
  padding-bottom: 26px;
  background: linear-gradient(to right, transparent, var(--color-divider) 48px, var(--color-divider) calc(100% - 48px), transparent) no-repeat bottom / 100% 1px;
}

.lib-stats div {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
}

.lib-stats dd {
  margin: 0;
  font-size: 30px;
  font-weight: var(--font-heading-weight);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.lib-stats dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

/* ---- Resume / start card ---- */
.lib-resume {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 20px 22px;
  border: 1px solid var(--color-accent-800);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(120deg, color-mix(in srgb, var(--color-accent) 10%, transparent), transparent 62%),
    var(--glass-fill);
}

.lib-resume-copy {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.lib-resume-title {
  margin: 0;
  font-size: 20px;
  font-weight: var(--font-heading-weight);
  line-height: 1.25;
}

.lib-resume-meta {
  margin: 0;
  font-size: 13.5px;
  color: var(--color-text-muted);
}

.lib-resume .qt-progress {
  max-width: 440px;
  margin-top: 8px;
}

.lib-resume-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
}

/* ---- Sections ---- */
.lib-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lib-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
}

.lib-section-head h2 {
  margin: 0;
  font-size: 22px;
  font-weight: var(--font-heading-weight);
  letter-spacing: -0.01em;
}

.lib-section-head p {
  margin: 0;
  font-size: 12.5px;
  color: var(--color-text-faint);
}

/* ---- Course tracks ---- */
.lib-tracks {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.lib-track {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
}

.lib-track-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.lib-track-status {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--color-text-faint);
}

.lib-track h3 {
  margin: 4px 0 0;
  font-size: 18px;
  font-weight: var(--font-heading-weight);
  line-height: 1.25;
}

.lib-track p {
  flex: 1;
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--color-text-muted);
}

.lib-track-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-faint);
}

.lib-track .qt-progress {
  margin-top: 6px;
}

.lib-track[data-state="in-progress"] {
  border-color: var(--color-accent-700);
}

.lib-track[data-state="in-progress"] .lib-track-status {
  color: var(--color-accent-300);
}

.lib-track[data-state="complete"] .lib-track-status {
  color: var(--color-text-muted);
}

.lib-track[data-state="complete"] .qt-progress > span {
  background: var(--color-neutral-500);
}

.lib-track--soon {
  border-style: dashed;
  border-color: var(--color-neutral-700);
  background: transparent;
  box-shadow: none;
}

a.lib-track--soon:hover {
  background: color-mix(in srgb, var(--color-text) 3%, transparent);
}

.lib-track--soon h3 {
  color: var(--color-text-muted);
}

/* ---- Intermediate modules ---- */
.lib-modules {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-divider);
}

.lib-module {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: var(--color-surface);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.lib-module:hover {
  background: var(--color-raised);
}

.lib-module-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-300);
}

.lib-module h3 {
  margin: 0;
  font-size: 15px;
  font-weight: var(--font-heading-weight);
  line-height: 1.3;
}

.lib-module p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--color-text-muted);
}

.lib-module--ref .lib-module-num {
  color: var(--color-text-faint);
}

.lib-instruments {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.lib-instruments .qt-label {
  margin-right: 6px;
}

/* ---- About ---- */
.lib-about {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  align-items: start;
  gap: 14px;
}

.lib-about-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 26px;
}

.lib-about-card h3 {
  margin: 0;
  font-size: 18px;
  font-weight: var(--font-heading-weight);
}

.lib-about-card p {
  max-width: 66ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text-muted);
  text-wrap: pretty;
}

.lib-about-closing {
  padding-top: 16px;
  background: linear-gradient(to right, transparent, var(--color-divider) 48px, var(--color-divider) calc(100% - 48px), transparent) no-repeat top / 100% 1px;
  font-size: 15px;
  color: var(--color-text);
}

.lib-principles {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.lib-principles li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text-muted);
}

.lib-principles li::before {
  content: "";
  width: 8px;
  height: 1px;
  margin-top: 0.8em;
  background: var(--color-accent);
}

/* ---- Edge Optimizer card: phones only, the sidebar has it on wider screens ---- */
.lib-eo {
  display: none;
}

/* ---- Footer ---- */
.lib-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 20px;
  background: linear-gradient(to right, transparent, var(--color-divider) 48px, var(--color-divider) calc(100% - 48px), transparent) no-repeat top / 100% 1px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--color-text-faint);
}

.lib-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.lib-footer a:hover {
  color: var(--color-accent-300);
}

/* ---- Responsive ---- */
@media (max-width: 1279px) {
  .lib-tracks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lib-modules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1023px) {
  .lib {
    padding: 36px 32px 60px;
  }

  .lib-about {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 767px) {
  .lib {
    gap: 40px;
    padding: 28px 18px 40px;
  }

  .lib-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .lib-stats dd {
    font-size: 26px;
  }

  .lib-resume {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    padding: 18px;
  }

  .lib-resume .qt-btn {
    width: 100%;
  }

  .lib-eo {
    display: flex;
  }

  .lib-footer {
    flex-direction: column;
  }
}

@media (max-width: 559px) {
  .lib-tracks,
  .lib-modules {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .lib-module {
    transition: none;
  }
}