/* קלורי — app shell (FROZEN, SPEC §2.2–2.3, §3): header, nav, main, overlays.
   < 900px: bottom tab bar (64px + safe-area), first tab on the RIGHT (RTL flow).
   ≥ 900px: 200px rail on the start (right) side, content max 1100px. */

/* ---------- header ---------- */
.app-header {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  min-block-size: calc(var(--header-h) + var(--safe-top));
  padding-block-start: var(--safe-top);
  padding-inline: var(--sp-2);
  background: var(--c-surface);
  border-block-end: 1px solid var(--c-border);
}
.header-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: var(--hit);
  block-size: var(--hit);
  flex: none;
  border-radius: var(--r-full);
  color: var(--c-primary-text);
}
.header-back .icon {
  inline-size: 24px;
  block-size: 24px;
}
.header-back:hover { background: var(--c-surface-2); }
.app-header__title {
  flex: 1 1 auto;
  min-inline-size: 0;
  margin: 0;
  padding-inline-start: var(--sp-2);
  font-size: var(--fs-lg);
  font-weight: 700;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-back[hidden] + .app-header__title { padding-inline-start: var(--sp-2); }
.app-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex: none;
  margin-inline-start: auto;
}
.app-header__actions:empty { display: none; }
.app-header__actions .btn { min-block-size: 40px; }
.app-header__actions .btn--ghost { padding-inline: var(--sp-3); }

/* ---------- main ---------- */
.app-main {
  display: block;
  inline-size: 100%;
  max-inline-size: calc(var(--maxw) + 2 * var(--gutter));
  margin-inline: auto;
  padding-block: var(--sp-4) calc(var(--nav-offset) + var(--sp-5));
  padding-inline: var(--gutter);
  min-block-size: calc(100dvh - var(--header-h) - var(--safe-top));
}
.app-main:focus { outline: none; }

.page {
  display: grid;
  gap: var(--sp-4);
  align-content: start;
  min-inline-size: 0;
}
.page > * { min-inline-size: 0; }
.page--narrow {
  max-inline-size: 640px;
  margin-inline: auto;
  inline-size: 100%;
}

/* ---------- bottom tab bar (phones) ---------- */
.app-nav {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: stretch;
  block-size: calc(var(--nav-h) + var(--safe-bottom));
  padding-block-end: var(--safe-bottom);
  background: var(--c-surface);
  border-block-start: 1px solid var(--c-border);
  box-shadow: 0 -1px 0 rgba(0, 0, 0, .02);
}
.nav__link {
  flex: 1 1 0;
  min-inline-size: 0;
  min-block-size: var(--hit-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: var(--sp-1) 2px;
  color: var(--c-text-2);
  text-decoration: none;
  font-size: var(--fs-xs);
  line-height: 1.2;
  border-radius: var(--r-2);
  transition: color var(--dur-1), background-color var(--dur-1);
  -webkit-user-select: none;
  user-select: none;
}
.nav__link:hover { text-decoration: none; color: var(--c-text); }
.nav__link:focus-visible { outline-offset: -3px; }
.nav__icon {
  inline-size: 26px;
  block-size: 26px;
  flex: none;
}
.nav__link .icon-filled { display: none; }
.nav__label {
  max-inline-size: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* active = colour + bold label + filled icon */
.nav__link[aria-current="page"] {
  color: var(--c-primary-text); /* 12px bold label needs 4.5:1 (--c-primary is 4.06:1 on white) */
}
.nav__link[aria-current="page"] .nav__icon { color: var(--c-primary); } /* icons only need 3:1 */
.nav__link[aria-current="page"] .nav__label { font-weight: 700; }
.nav__link[aria-current="page"] .icon-outline { display: none; }
.nav__link[aria-current="page"] .icon-filled { display: block; }
.nav__link[aria-current="page"] .icon-filled path[fill="none"] { stroke: var(--c-surface); }

/* ---------- overlay roots ---------- */
/* dialogs are fixed-positioned; the root itself never takes layout space */
#sheet-root { display: contents; }

#toast-root {
  position: fixed;
  inset-inline: var(--gutter);
  inset-block-end: calc(var(--nav-offset) + var(--sp-3));
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--sp-2);
  margin-inline: auto;
  max-inline-size: 440px;
  pointer-events: none;
}
#toast-root > * { pointer-events: auto; }

/* ---------- full-screen pages (onboarding): no tab bar ---------- */
body:has(> .app-main > .pg-onboarding) {
  --nav-offset: var(--safe-bottom);
}
body:has(> .app-main > .pg-onboarding) .app-nav { display: none; }

/* ---------- responsive grids ---------- */
.grid-2,
.grid-3 {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  align-items: start;
}
.grid-2 > *, .grid-3 > * { min-inline-size: 0; }
.grid-2--tight, .grid-3--tight { gap: var(--sp-2); }
.grid-2--always { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3--always { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (min-width: 600px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- desktop: start-side rail ---------- */
@media (min-width: 900px) {
  :root { --gutter: 24px; --nav-offset: 0px; }

  body {
    display: grid;
    grid-template-columns: var(--nav-w) minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
    min-block-size: 100dvh;
  }
  .app-nav {
    position: sticky;
    inset: auto;
    inset-block-start: 0;
    grid-column: 1;
    grid-row: 1 / -1;
    block-size: 100dvh;
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-1);
    padding: var(--sp-4) var(--sp-3) var(--sp-4);
    border-block-start: 0;
    border-inline-end: 1px solid var(--c-border);
    box-shadow: none;
  }
  .app-nav::before {
    content: "קלורי";
    display: block;
    padding: var(--sp-2) var(--sp-3) var(--sp-4);
    font-size: var(--fs-xl);
    font-weight: 800;
    color: var(--c-primary);
    letter-spacing: -.01em;
  }
  .nav__link {
    flex: none;
    flex-direction: row;
    justify-content: flex-start;
    gap: var(--sp-3);
    min-block-size: var(--hit-lg);
    padding: var(--sp-2) var(--sp-3);
    font-size: var(--fs-md);
    border-radius: var(--r-2);
  }
  .nav__link:hover { background: var(--c-surface-2); }
  .nav__link[aria-current="page"] {
    background: var(--c-primary-soft);
    color: var(--c-primary-text);
  }
  .nav__link[aria-current="page"] .nav__icon { color: var(--c-primary); }
  .nav__icon { inline-size: 24px; block-size: 24px; }

  .app-header {
    grid-column: 2;
    grid-row: 1;
    min-block-size: 64px;
    padding-inline: var(--gutter);
  }
  .app-header__title { font-size: var(--fs-xl); }

  .app-main {
    grid-column: 2;
    grid-row: 2;
    padding-block: var(--sp-5) var(--sp-6);
    min-block-size: 0;
  }

  #toast-root {
    inset-inline: auto;
    inset-inline-start: calc(var(--nav-w) + var(--gutter));
    inset-inline-end: var(--gutter);
    inset-block-end: var(--sp-5);
    margin-inline: auto;
  }

  /* onboarding: single column, no rail */
  body:has(> .app-main > .pg-onboarding) { grid-template-columns: minmax(0, 1fr); }
  body:has(> .app-main > .pg-onboarding) .app-header,
  body:has(> .app-main > .pg-onboarding) .app-main { grid-column: 1; }
  body:has(> .app-main > .pg-onboarding) #toast-root { inset-inline-start: var(--gutter); }
}

/* print: no chrome */
@media print {
  .app-nav, .app-header, #toast-root, .skip-link { display: none !important; }
  body { display: block; }
  .app-main { max-inline-size: none; padding: 0; }
}