/* ============================================================
   App shell — landing, app frame, topbar, scrubber, main
   ============================================================ */

/* ---------- App frame ---------- */
.app {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 100vh;
}

/* ---------- Landing (pre-entry) ---------- */
.landing {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-12);
  padding: var(--space-12) var(--space-10);
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--data-lavender-tint), transparent 50%),
    radial-gradient(900px 500px at 110% 20%, var(--brand-yellow-tint), transparent 55%),
    var(--surface-default);
}

.landing__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-7);
}

.landing__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-lg);
  color: var(--brand-purple-deep);
  letter-spacing: var(--tracking-tight);
}

.landing__brand-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--brand-purple-cta), var(--brand-purple-deep));
  display: inline-grid;
  place-items: center;
  color: var(--brand-yellow);
  font-size: 18px;
}

.landing__meta {
  display: inline-flex;
  gap: var(--space-7);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.landing__hero {
  max-width: 880px;
  display: grid;
  gap: var(--space-7);
  align-content: center;
  padding: var(--space-10) 0;
}

.landing__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--sds-text-brand-default);
}

.landing__eyebrow::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--brand-yellow);
  box-shadow: 0 0 0 4px var(--brand-yellow-tint);
}

.landing__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 64px);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--brand-purple-deep);
  margin: 0;
  font-weight: var(--font-weight-bold);
}

.landing__title em {
  font-style: normal;
  background: linear-gradient(180deg, transparent 65%, var(--brand-yellow) 65%);
  padding: 0 4px;
}

.landing__lede {
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  max-width: 64ch;
  margin: 0;
}

.landing__personas,
.landing__markets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-3);
}

.landing__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-7);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  border-top: 1px dashed var(--border-default);
  padding-top: var(--space-7);
}

.landing__shortcuts {
  display: inline-flex;
  gap: var(--space-7);
}

.landing__shortcuts kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  background: var(--surface-muted);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
}

/* ---------- Topbar ----------
   4 children (brand · context · nav · actions) so we need 4 columns.
   A previous 3-col grid caused actions to wrap onto row 2 silently. */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-4) var(--space-7);
  background: var(--surface-default);
  border-bottom: 1px solid var(--border-default);
  backdrop-filter: blur(8px);
}

.topbar__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: var(--font-weight-bold);
  color: var(--brand-purple-deep);
  font-size: var(--text-md);
}

.topbar__context {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  justify-self: start;
  padding-left: var(--space-4);
  border-left: 1px solid var(--border-default);
  margin-left: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.topbar__context strong {
  color: var(--text-primary);
}

.topbar__nav {
  display: inline-flex;
  gap: var(--space-2);
  justify-self: center;
}

.topbar__nav a {
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  transition: background var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.topbar__nav a:hover {
  background: var(--surface-muted);
  text-decoration: none;
  color: var(--text-primary);
}

.topbar__nav a[aria-current="page"] {
  background: var(--sds-bg-brand-tertiary);
  color: var(--sds-text-brand-default);
}

.topbar__actions {
  display: inline-flex;
  gap: var(--space-4);
  align-items: center;
  justify-self: end;
}

/* ---------- Scrubber bar ---------- */
.scrubber {
  position: sticky;
  top: 64px;
  z-index: 30;
  display: grid;
  /* Fixed left slot keeps the track from reflowing when the stage label
     changes length (W1 "Onboard" vs W7 "Week 1-4: Steady compounding"). */
  grid-template-columns: 340px 1fr 96px;
  align-items: center;
  gap: var(--space-7);
  padding: var(--space-4) var(--space-7);
  background: var(--surface-default);
  border-bottom: 1px solid var(--border-default);
}

.scrubber__label {
  /* Grid (not inline-flex) + min-width:0 lets strong truncate via ellipsis
     instead of spilling out of the fixed 340px left slot. */
  display: grid;
  gap: 2px;
  min-width: 0;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}
.scrubber__label > span,
.scrubber__label > strong {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.scrubber__label strong {
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: var(--font-weight-bold);
  text-transform: none;
  letter-spacing: 0;
  font-size: var(--text-sm);
}

.scrubber__track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  padding: 4px;
  background: var(--surface-muted);
  border-radius: var(--radius-pill);
  min-height: 40px;
}

.scrubber__tick {
  display: inline-grid;
  place-items: center;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
  white-space: nowrap;
}
.scrubber__tick:hover {
  background: var(--sds-bg-brand-tertiary);
  color: var(--sds-text-brand-default);
}
.scrubber__tick[aria-pressed="true"] {
  background: var(--brand-purple-deep);
  color: var(--text-on-brand);
}
.scrubber__tick--plateau {
  color: var(--state-attention-fg);
}
.scrubber__tick--plateau[aria-pressed="true"] {
  background: var(--state-attention-fg);
}
.scrubber__tick--milestone::after {
  content: "★";
  margin-left: 4px;
  color: var(--brand-yellow);
}

.scrubber__playback {
  display: inline-flex;
  gap: var(--space-2);
}

/* ---------- Main ---------- */
.main {
  padding: var(--space-12) var(--space-7);
  min-height: calc(100vh - 64px - 72px);
  display: grid;
  gap: var(--space-10);
}

.main__inner {
  max-width: var(--max-content);
  width: 100%;
  margin: 0 auto;
  display: grid;
  gap: var(--space-10);
}

/* ---------- Rationale overlay ---------- */
.rationale-root {
  position: relative;
}

.app[data-rationale="on"] [data-rationale-for] {
  outline: 2px dashed var(--state-attention-fg);
  outline-offset: 4px;
  border-radius: var(--radius-md);
  cursor: help;
  transition: outline-color var(--duration-fast) var(--ease-standard);
  position: relative;
}

.app[data-rationale="on"] [data-rationale-for]:hover {
  outline-color: var(--brand-purple-cta);
  outline-style: solid;
}

.rationale-popover {
  position: fixed;
  z-index: 80;
  max-width: 380px;
  background: var(--brand-purple-deep);
  color: var(--text-on-brand);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  display: none;
  pointer-events: none;
}

.rationale-popover[data-open="true"] {
  display: grid;
  gap: var(--space-4);
}

.rationale-popover__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--brand-yellow);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.rationale-popover__quote {
  font-style: italic;
  border-left: 2px solid var(--brand-yellow);
  padding-left: var(--space-4);
  color: var(--text-on-brand);
}

.rationale-popover__source {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--data-lavender);
  opacity: 0.85;
}

/* Toggle button state */
[data-rationale="on"] .rationale-toggle {
  background: var(--brand-yellow);
  color: var(--brand-purple-deep);
  border-color: var(--brand-yellow);
}

/* ---------- Footer ---------- */
.footer-strip {
  padding: var(--space-5) var(--space-7);
  background: var(--surface-default);
  border-top: 1px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  display: flex;
  justify-content: space-between;
  gap: var(--space-7);
  flex-wrap: wrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .topbar {
    grid-template-columns: auto 1fr auto;
  }
  .topbar__context {
    display: none;
  }
}

@media (max-width: 960px) {
  .topbar {
    grid-template-columns: auto 1fr auto;
  }
  .topbar__nav {
    grid-column: 1 / -1;
    justify-self: stretch;
    overflow-x: auto;
    padding-bottom: var(--space-2);
  }
  .topbar__context {
    display: none;
  }
  .scrubber {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .main {
    padding: var(--space-7) var(--space-5);
  }
}

@media (max-width: 640px) {
  .landing {
    padding: var(--space-7) var(--space-5);
  }
  .scrubber__track {
    grid-template-columns: repeat(8, minmax(48px, 1fr));
    overflow-x: auto;
  }
}