/* App shell (mobile-first): top bar + bottom tab bar → sidebar from 48em. Public layout, landing, status pages, style guide. */
@layer layout {
  /* ---------- Shell ---------- */
  .shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 1fr auto;
    grid-template-areas: "top" "main" "foot";
    min-block-size: 100dvh;
  }

  .container {
    inline-size: min(100%, var(--content-w));
    margin-inline: auto;
    padding-inline-start: max(var(--s-4), var(--safe-inline-start));
    padding-inline-end: max(var(--s-4), var(--safe-inline-end));
  }
  .container--wide { inline-size: min(100%, 72rem); }
  .container--narrow { inline-size: min(100%, 32rem); }

  /* ---------- Top bar ---------- */
  .topbar {
    grid-area: top;
    position: sticky;
    inset-block-start: 0;
    z-index: var(--z-top);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-3);
    min-block-size: calc(var(--topbar-h) + var(--safe-top));
    padding-block-start: var(--safe-top);
    padding-inline-start: max(var(--s-4), var(--safe-inline-start));
    padding-inline-end: max(var(--s-3), var(--safe-inline-end));
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(14px) saturate(1.3);
    border-block-end: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  }
  .topbar__actions { display: flex; align-items: center; gap: var(--s-1); }

  .brand {
    display: inline-flex;
    align-items: center;
    gap: var(--s-2);
    min-block-size: var(--tap);
    color: var(--text);
    font-weight: 800;
    font-size: var(--fs-md);
    letter-spacing: -0.03em;
    text-decoration: none;
  }
  .brand__mark {
    display: grid;
    place-items: center;
    inline-size: 2rem;
    block-size: 2rem;
    border-radius: var(--r-sm);
    background: linear-gradient(160deg, var(--brand-hover), var(--brand) 55%, var(--brand-press));
    color: #fff;
    box-shadow: 0 4px 12px -3px color-mix(in srgb, var(--brand) 55%, transparent);
  }
  .brand__mark .icon { inline-size: 1.25rem; block-size: 1.25rem; fill: currentColor; stroke: none; }

  /* ---------- Main + footer ---------- */
  .main {
    grid-area: main;
    min-inline-size: 0;
    padding-block: var(--s-6) var(--s-8);
  }
  .page-head { display: flex; flex-direction: column; gap: var(--s-1); margin-block-end: var(--s-6); }
  .page-head p { color: var(--text-muted); }

  .footer {
    grid-area: foot;
    border-block-start: 1px solid var(--border);
    padding-block: var(--s-6) calc(var(--nav-h) + var(--safe-bottom) + var(--s-6));
    color: var(--text-muted);
    font-size: var(--fs-sm);
  }
  .footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s-4) var(--s-6); }
  .footer__links { display: flex; flex-wrap: wrap; gap: var(--s-1) var(--s-4); list-style: none; padding: 0; }
  .footer__links a { color: inherit; display: inline-flex; align-items: center; min-block-size: var(--tap); }
  .footer__controls { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); }
  .footer__copy { inline-size: 100%; }

  /* ---------- Bottom tab bar (mobile) / sidebar (≥48em) ---------- */
  .nav {
    position: fixed;
    inset-inline: 0;
    inset-block-end: 0;
    z-index: var(--z-nav);
    padding-block-end: var(--safe-bottom);
    padding-inline: var(--safe-inline-start) var(--safe-inline-end);
    background: color-mix(in srgb, var(--surface) 90%, transparent);
    backdrop-filter: blur(18px) saturate(1.4);
    border-block-start: 1px solid var(--border);
  }
  .nav__brand { display: none; }
  .nav__list {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    align-items: stretch;
    list-style: none;
    padding: 0;
    margin: 0 auto;
    max-inline-size: 36rem;
    block-size: var(--nav-h);
  }
  .nav__link {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.125rem;
    block-size: 100%;
    min-inline-size: var(--tap);
    padding-inline: var(--s-1);
    color: var(--text-muted);
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    text-decoration: none;
    transition: color var(--dur-fast) var(--ease);
  }
  .nav__link .icon { inline-size: 1.5rem; block-size: 1.5rem; transition: transform var(--dur) var(--ease-spring); }
  .nav__link:hover { color: var(--text); }
  .nav__link:active .icon { transform: scale(0.9); }
  .nav__link[aria-current="page"] { color: var(--text); font-weight: 750; }
  .nav__link[aria-current="page"] .icon { color: var(--brand-text); stroke-width: 2.4; }
  .nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline: 32%;
    block-size: 3px;
    border-radius: 0 0 var(--r-pill) var(--r-pill);
    background: var(--brand);
  }

  .nav__log { display: grid; place-items: center; }
  .nav__log-link {
    display: grid;
    place-items: center;
    inline-size: 3.5rem;
    block-size: 3.5rem;
    margin-block-start: -1.25rem;
    border-radius: var(--r-pill);
    background: linear-gradient(160deg, var(--brand-hover), var(--brand) 60%, var(--brand-press));
    color: var(--on-brand);
    box-shadow: var(--glow);
    text-decoration: none;
    border: 3px solid var(--bg);
    transition: transform var(--dur) var(--ease-spring), box-shadow var(--dur) var(--ease);
  }
  .nav__log-link .icon { inline-size: 1.75rem; block-size: 1.75rem; stroke-width: 2.6; }
  .nav__log-link:hover { transform: translateY(-2px) scale(1.04); }
  .nav__log-link:active { transform: scale(0.94); }
  .nav__log-link .nav__label { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

  @media (min-width: 48em) {
    .shell {
      grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
      grid-template-areas: "nav top" "nav main" "nav foot";
    }
    .nav {
      grid-area: nav;
      position: sticky;
      inset-block-start: 0;
      inset-inline: auto;
      block-size: 100dvh;
      display: flex;
      flex-direction: column;
      gap: var(--s-6);
      padding: var(--s-5) var(--s-4);
      background: var(--surface);
      backdrop-filter: none;
      border-block-start: 0;
      border-inline-end: 1px solid var(--border);
    }
    .nav__brand { display: inline-flex; padding-inline: var(--s-2); }
    .topbar .brand { display: none; }
    .topbar { justify-content: flex-end; }
    .nav__list { display: flex; flex-direction: column; gap: var(--s-1); max-inline-size: none; margin: 0; block-size: auto; }
    .nav__link {
      flex-direction: row;
      justify-content: flex-start;
      gap: var(--s-3);
      block-size: auto;
      min-block-size: var(--tap);
      padding-inline: var(--s-4);
      border-radius: var(--r-md);
      font-size: var(--fs-base);
    }
    .nav__link:hover { background: var(--surface-2); }
    .nav__link .icon { inline-size: 1.375rem; block-size: 1.375rem; }
    .nav__link[aria-current="page"] { background: var(--brand-soft); color: var(--brand-text); }
    .nav__link[aria-current="page"]::before { inset-block: 25%; inset-inline: auto; inset-inline-start: 0; inline-size: 3px; block-size: auto; border-radius: 0 var(--r-pill) var(--r-pill) 0; }
    [dir="rtl"] .nav__link[aria-current="page"]::before { border-radius: var(--r-pill) 0 0 var(--r-pill); }
    .nav__log { display: block; margin-block: var(--s-2); }
    .nav__log-link {
      display: flex;
      justify-content: center;
      gap: var(--s-2);
      inline-size: 100%;
      block-size: var(--tap);
      margin: 0;
      border: 0;
      border-radius: var(--r-md);
      font-weight: 750;
    }
    .nav__log-link .icon { inline-size: 1.25rem; block-size: 1.25rem; }
    .nav__log-link .nav__label { position: static; inline-size: auto; block-size: auto; clip-path: none; overflow: visible; }
    .footer { padding-block-end: var(--s-8); }
    .main { padding-block: var(--s-8) var(--s-10); }
  }

  /* ---------- Public layout ---------- */
  .pub { min-block-size: 100dvh; display: flex; flex-direction: column; }
  .pub__bar {
    display: flex; align-items: center; justify-content: space-between; gap: var(--s-3);
    padding-block: calc(var(--s-2) + var(--safe-top)) var(--s-2);
  }
  .pub__main { flex: 1; }
  .pub .footer { padding-block-end: var(--s-8); }

  /* ---------- Landing ---------- */
  .hero { position: relative; padding-block: var(--s-8) var(--s-12); }
  .hero::before {
    content: "";
    position: absolute;
    inset-block-start: -8rem;
    inset-inline: -20%;
    block-size: 36rem;
    background: radial-gradient(closest-side, color-mix(in srgb, var(--brand) 16%, transparent), transparent 70%);
    pointer-events: none;
    z-index: -1;
  }
  .hero__grid { display: grid; gap: var(--s-10); align-items: center; }
  .hero__eyebrow { display: inline-flex; align-items: center; gap: var(--s-2); color: var(--brand-text); font-weight: 700; font-size: var(--fs-sm); }
  .hero__title { font-size: var(--fs-3xl); line-height: 1.02; letter-spacing: -0.04em; font-weight: 850; margin-block: var(--s-3) var(--s-4); }
  .hero__title em { font-style: normal; background: linear-gradient(100deg, var(--brand-text), var(--brand-edge)); -webkit-background-clip: text; background-clip: text; color: transparent; }
  .hero__lead { font-size: var(--fs-md); color: var(--text-muted); max-inline-size: 34rem; }
  .hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-block-start: var(--s-6); }
  .hero__visual { display: grid; gap: var(--s-4); justify-items: center; }
  .hero__card {
    inline-size: min(100%, 26rem);
    padding: var(--s-6) var(--s-5) var(--s-5);
    border-radius: var(--r-xl);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-3);
  }

  .section { padding-block: var(--s-10); }
  /* Landing page: clear separation between consecutive sections (divider line + alternating tinted band). */
  .pub__main > .hero + .section,
  .pub__main > .section + .section { border-block-start: 1px solid var(--border); }
  .pub__main > .section--alt { background: var(--surface-2); }
  @media (min-width: 48em) { .section { padding-block: var(--s-12); } }
  .section__head { max-inline-size: 36rem; margin-block-end: var(--s-8); }
  .section__head h2 { font-size: var(--fs-2xl); letter-spacing: -0.035em; }
  .section__head p { color: var(--text-muted); margin-block-start: var(--s-2); font-size: var(--fs-md); }
  .feature-grid { display: grid; gap: var(--s-4); list-style: none; padding: 0; }
  .feature { display: flex; flex-direction: column; gap: var(--s-2); }
  .feature__icon { display: grid; place-items: center; inline-size: 2.75rem; block-size: 2.75rem; border-radius: var(--r-md); background: var(--brand-soft); color: var(--brand-text); margin-block-end: var(--s-2); }
  .feature p { color: var(--text-muted); }
  .steps { counter-reset: step; display: grid; gap: var(--s-4); list-style: none; padding: 0; }
  .step { display: grid; grid-template-columns: auto 1fr; gap: var(--s-4); align-items: start; }
  .step::before {
    counter-increment: step; content: counter(step);
    display: grid; place-items: center; inline-size: 2.5rem; block-size: 2.5rem; border-radius: var(--r-pill);
    background: var(--text); color: var(--bg); font-weight: 800; font-variant-numeric: tabular-nums;
  }
  .step p { color: var(--text-muted); }
  .cta-band {
    display: grid; gap: var(--s-4); justify-items: start;
    padding: var(--s-8) var(--s-6); border-radius: var(--r-xl);
    background: linear-gradient(135deg, var(--brand-hover), var(--brand) 50%, var(--brand-press));
    color: var(--on-brand);
    box-shadow: var(--shadow-3);
  }
  .cta-band h2 { font-size: var(--fs-2xl); letter-spacing: -0.035em; }
  /* Dark button with gold text on the gold band: high contrast (>7:1), a visible border and lift. */
  .cta-band .btn--primary { --btn-bg: var(--on-brand); --btn-fg: #fff3c4; background: var(--on-brand); color: #fff3c4; border: 2px solid var(--on-brand); font-weight: 750;
    box-shadow: 0 10px 24px -8px rgb(36 24 0 / 0.55), 0 0 0 4px rgb(255 255 255 / 0.3); }
  .cta-band .btn--primary:hover { background: #3a2800; color: #fff; transform: translateY(-1px); box-shadow: 0 14px 28px -8px rgb(36 24 0 / 0.6), 0 0 0 5px rgb(255 255 255 / 0.35); }
  .cta-band .btn--primary:focus-visible { outline: 3px solid var(--on-brand); outline-offset: 3px; }

  @media (min-width: 48em) {
    .hero__grid { grid-template-columns: 1.1fr 0.9fr; }
    .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .step { grid-template-columns: 1fr; }
    .cta-band { padding: var(--s-12) var(--s-10); }
  }

  /* ---------- Status pages (error / offline / coming soon) ---------- */
  .status { min-block-size: 60dvh; display: grid; place-content: center; justify-items: center; gap: var(--s-4); text-align: center; padding-block: var(--s-10); }
  .status__code { font-size: var(--fs-xs); font-weight: 750; letter-spacing: 0.12em; color: var(--text-subtle); text-transform: uppercase; }
  .status h1 { font-size: var(--fs-2xl); letter-spacing: -0.035em; }
  .status p { color: var(--text-muted); max-inline-size: 28rem; }

  /* ---------- Dashboard ---------- */
  .dash { display: grid; gap: var(--s-4); }
  .stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-3); }
  @media (min-width: 48em) {
    .dash { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .dash__wide { grid-column: 1 / -1; }
    .stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  }

  /* ---------- Style guide ---------- */
  .sg { display: grid; gap: var(--s-10); }
  .sg__section { display: grid; gap: var(--s-4); }
  .sg__section > h2 { padding-block-end: var(--s-2); border-block-end: 1px solid var(--border); }
  .sg-pair { display: grid; gap: var(--s-4); }
  .sg-panel { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--s-5); display: grid; gap: var(--s-6); align-content: start; min-inline-size: 0; }
  .sg-panel h3 { color: var(--text-muted); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.1em; }
  .sg-swatches { display: grid; grid-template-columns: repeat(auto-fill, minmax(7rem, 1fr)); gap: var(--s-2); }
  .sg-swatch { display: grid; gap: var(--s-1); font-size: var(--fs-xs); color: var(--text-muted); }
  .sg-swatch__chip { block-size: 3rem; border-radius: var(--r-sm); border: 1px solid var(--border); }
  .sg-type > * + * { margin-block-start: var(--s-2); }
  @media (min-width: 64em) {
    .sg-pair { grid-template-columns: 1fr 1fr; }
    .container--sg { inline-size: min(100%, 80rem); }
  }
}

@layer layout {
  /* Toasts on layouts without a tab bar */
  .pub ~ .toasts { inset-block-end: calc(var(--safe-bottom) + var(--s-4)); }
}