/* EtherCalc landing page (start.html).
 *
 * The hero is a spreadsheet fragment rendered in M3E material: gridlines,
 * highlighted A/1 headers, a selection marquee with fill handle around the
 * headline cell, and a formula bar mirroring it. Color/shape come from the
 * <m3e-theme color="#0c3159"> token set; every var() carries the concrete
 * light-scheme value that theme produces as a fallback, so the pre-upgrade
 * paint (before Lit registers m3e-theme and materializes tokens on <html>)
 * is byte-identical to the post-upgrade one — no flash.
 *
 * Type: system sans for display/body; monospace for the spreadsheet's own
 * voice (cell refs, formula bar, facts strip). No webfont downloads — this
 * page makes zero third-party requests.
 */

:root {
  --ec-font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --ec-font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;

  --ec-primary: var(--md-sys-color-primary, #1e5fa6);
  --ec-on-primary: var(--md-sys-color-on-primary, #ffffff);
  --ec-primary-container: var(--md-sys-color-primary-container, #d4e3ff);
  --ec-on-primary-container: var(--md-sys-color-on-primary-container, #004785);
  --ec-surface: var(--md-sys-color-surface, #faf9fd);
  --ec-on-surface: var(--md-sys-color-on-surface, #1a1c1e);
  --ec-on-surface-variant: var(--md-sys-color-on-surface-variant, #43474e);
  --ec-surface-container: var(--md-sys-color-surface-container, #eeedf1);
  --ec-surface-container-low: var(--md-sys-color-surface-container-low, #f4f3f7);
  --ec-outline: var(--md-sys-color-outline, #74777f);
  --ec-outline-variant: var(--md-sys-color-outline-variant, #c3c6cf);
  --ec-error: var(--md-sys-color-error, #ba1a1a);

  --ec-gridline: color-mix(in srgb, var(--ec-outline-variant) 62%, var(--ec-surface));
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--ec-font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ec-on-surface);
  background: var(--ec-surface-container);
  -webkit-font-smoothing: antialiased;
}

/* ---- Page title (in-flow, no chrome band) ---------------------------- */

.ec-top {
  max-width: 880px;
  margin: 0 auto;
  padding: 22px 24px 6px;
}

.ec-brand {
  /* `inline-flex`, not `flex`: since `.ec-top` is no longer itself a flex
     container (the nav moved out to float independently), a block-level
     flex h1 would stretch to `.ec-top`'s full content width — its
     bounding box would extend far past the visible "EtherCalc" text,
     which is exactly the kind of invisible hit-region a real layout
     collision check should never measure against. inline-flex keeps the
     internal icon+text flex layout but shrink-wraps the box itself. */
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 1.125rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.ec-brand__glyph {
  width: 21px;
  height: 21px;
  color: var(--ec-primary);
}

/* Floating project-links cluster now lives in the SHARED
 * packages/client/src/passkey/ui.css (both start.html and index.html
 * already load it) — the sheet page needs the same nav, just anchored
 * to a different corner (see that file for the full rationale). Only
 * the landing-page-specific narrow-width override (drop below the
 * brand) stays here, scoped to `.ec-floatnav--top`. */

/* ---- Layout column -------------------------------------------------- */

.ec-main {
  max-width: 880px;
  margin: 0 auto;
  padding: 18px 24px 56px;
}

/* ---- The sheet hero -------------------------------------------------- */

.ec-sheet {
  background: var(--ec-surface);
  border: 1px solid var(--ec-outline-variant);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(12, 49, 89, 0.10), 0 4px 16px rgba(12, 49, 89, 0.07);
}

.ec-formulabar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--ec-outline-variant);
  font-family: var(--ec-font-mono);
}

.ec-formulabar__ref {
  font-size: 0.75rem;
  color: var(--ec-on-surface-variant);
  background: var(--ec-surface-container);
  border: 1px solid var(--ec-outline-variant);
  border-radius: 6px;
  padding: 2px 10px;
}

.ec-formulabar__fx {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--ec-on-surface-variant);
}

.ec-formulabar__value {
  font-size: 0.8125rem;
  color: var(--ec-on-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ec-formulabar__value--typing::after {
  content: '';
  display: inline-block;
  width: 2px;
  height: 1.05em;
  margin-left: 1px;
  vertical-align: text-bottom;
  background: var(--ec-primary);
  animation: ec-caret 1s steps(2, start) infinite;
}

@keyframes ec-caret {
  50% { opacity: 0; }
}

/* Grid: row-header column + A (wide) + B/C/D. Gridlines via per-cell
   right/bottom borders; the last row keeps no bottom border so the sheet
   reads as cropped — it continues past the card edge. */
.ec-grid {
  display: grid;
  grid-template-columns: 44px minmax(0, 2.6fr) 1fr 1fr 1fr;
}

.ec-grid__corner,
.ec-grid__col,
.ec-grid__row {
  font-family: var(--ec-font-mono);
  font-size: 0.6875rem;
  color: var(--ec-on-surface-variant);
  background: var(--ec-surface-container-low);
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 1px solid var(--ec-gridline);
  border-bottom: 1px solid var(--ec-gridline);
  min-height: 30px;
}

.ec-grid__col--active,
.ec-grid__row--active {
  background: var(--ec-primary-container);
  color: var(--ec-on-primary-container);
  font-weight: 600;
}

.ec-grid__cell {
  background: var(--ec-surface);
  border-right: 1px solid var(--ec-gridline);
  border-bottom: 1px solid var(--ec-gridline);
  min-height: 44px;
}

.ec-grid > :nth-last-child(-n + 5) {
  border-bottom: none;
}

.ec-grid > :nth-child(5n) {
  border-right: none;
}

/* A1: the selected cell. 2px marquee + fill handle, exactly as a
   spreadsheet draws its selection. */
.ec-grid__cell--a1 {
  position: relative;
  padding: 22px 26px 24px;
  box-shadow: inset 0 0 0 2px var(--ec-primary);
}

.ec-headline {
  margin: 0;
  font-size: clamp(1.85rem, 4.4vw, 2.9rem);
  font-weight: 800;
  letter-spacing: -0.022em;
  line-height: 1.1;
  text-wrap: balance;
}

.ec-fillhandle {
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 8px;
  height: 8px;
  background: var(--ec-primary);
  border: 1px solid var(--ec-surface);
  z-index: 1;
}

.ec-grid__cell--a2 {
  padding: 14px 26px 16px;
}

.ec-subline {
  margin: 0;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ec-on-surface-variant);
  max-width: 46ch;
}

/* ---- Actions row (async enhancement slot) --------------------------- */

#intro-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 26px 2px 0;
  min-height: 48px;
}

/* ui.css gives the injected #ec-landing-actions its own margin-top for
   the legacy layout; inside this flex row it must sit on the baseline. */
body #intro-links > #ec-landing-actions {
  margin-top: 0;
}

/* Visual twin of an m3e-button[variant=filled] so the static public CTA
   and the async-injected M3E buttons read as one family. */
.ec-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--ec-primary);
  color: var(--ec-on-primary);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
}

.ec-cta:hover {
  background: color-mix(in srgb, var(--ec-primary) 92%, #fff);
  box-shadow: 0 1px 2px rgba(12, 49, 89, 0.3);
}

.ec-cta:active {
  background: color-mix(in srgb, var(--ec-primary) 88%, #fff);
}

.ec-cta:focus-visible {
  outline: 2px solid var(--ec-on-primary-container);
  outline-offset: 2px;
}

/* ---- Import card ----------------------------------------------------- */

.ec-drop {
  margin-top: 30px;
  padding: 26px 24px 22px;
  text-align: center;
  background: var(--ec-surface-container-low);
  border: 1.5px dashed var(--ec-outline);
  border-radius: 0.75rem;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.ec-drop__icon {
  width: 26px;
  height: 26px;
  color: var(--ec-on-surface-variant);
}

.ec-drop__text {
  margin: 6px 0 2px;
  font-size: 0.9375rem;
  color: var(--ec-on-surface-variant);
}

.ec-drop--over {
  border-color: var(--ec-primary);
  border-style: solid;
  background: color-mix(in srgb, var(--ec-primary-container) 40%, var(--ec-surface));
}

.ec-drop--busy .ec-drop__text {
  color: var(--ec-on-surface);
  animation: ec-pulse 1.1s ease-in-out infinite;
}

.ec-drop--error {
  border-color: var(--ec-error);
}

.ec-drop--error .ec-drop__text {
  color: var(--ec-error);
}

@keyframes ec-pulse {
  50% { opacity: 0.45; }
}

.ec-drop__browse-row {
  margin: 0 0 4px;
}

.ec-drop__browse {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--ec-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
}

.ec-drop__browse:hover {
  background: color-mix(in srgb, var(--ec-primary) 8%, transparent);
}

.ec-drop__browse-row:focus-within .ec-drop__browse {
  outline: 2px solid var(--ec-primary);
  outline-offset: 1px;
}

#ec-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.ec-drop__rename {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--ec-on-surface-variant);
  cursor: pointer;
}

.ec-drop__rename input {
  accent-color: var(--ec-primary);
  width: 15px;
  height: 15px;
}

/* ---- Facts strip ------------------------------------------------------ */

.ec-facts {
  margin: 26px 0 0;
  text-align: center;
  font-family: var(--ec-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--ec-on-surface-variant);
}

.ec-facts a {
  color: var(--ec-primary);
  font-weight: 600;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.ec-facts a:focus-visible {
  outline: 2px solid var(--ec-primary);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Responsive ------------------------------------------------------- */

@media (max-width: 680px) {
  .ec-top { padding: 16px 16px 2px; }
  .ec-main { padding: 12px 16px 40px; }

  .ec-grid {
    grid-template-columns: 34px minmax(0, 2.2fr) 1fr;
  }

  .ec-grid__hide-sm { display: none; }

  /* :nth-child counts the hidden C/D nodes too. The desktop last-row rule
     (:nth-last-child(-n+5)) already covers the visible last row here; the
     only change is the visible right edge, which moves to the B column —
     DOM indices 5n+3. The desktop 5n rule now targets hidden D cells, so
     leaving it is harmless. */
  .ec-grid > :nth-child(5n + 3) { border-right: none; }

  .ec-grid__cell--a1 { padding: 18px 18px 20px; }
  .ec-grid__cell--a2 { padding: 12px 18px 14px; }

  #intro-links { justify-content: center; }
  .ec-cta { width: 100%; justify-content: center; }
}

@media (max-width: 400px) {
  /* Below ~351px, "EtherCalc" and the floating pill collide side by side
     (brand right edge ≈160px vs. pill left edge ≈ vw-195px). Drop the
     pill below the title row instead of shrinking either element. */
  .ec-floatnav--top {
    top: 52px;
    right: 14px;
  }

  /* The dropped pill's own box now occupies ~52-93px in the viewport.
     `.ec-main`'s 12px top padding (from the 680px rule) is nowhere near
     enough clearance — the sheet card would render underneath it.
     Reserve space so the card starts below the pill. */
  .ec-main {
    padding-top: 58px;
  }
}

/* ---- Reduced motion --------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .ec-formulabar__value--typing::after { animation: none; }
  .ec-drop--busy .ec-drop__text { animation: none; }
  .ec-cta, .ec-drop { transition: none; }
}