/* COMPONENTS — each primitive defined once, with its full state set */

/* ---- Button ---- */
.btn {
  --btn-bg: var(--accent);
  --btn-fg: var(--on-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 3.25rem;
  padding-inline: var(--s-5);
  border-radius: var(--r-pill);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: var(--fs-button);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  position: relative;
  isolation: isolate;
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast);
  box-shadow: var(--shadow-1);
}
.btn::after, .plat::after { content: ""; position: absolute; inset: 0; z-index: -1; border-radius: inherit; box-shadow: var(--shadow-2); opacity: 0; transition: opacity var(--dur) var(--ease-out); pointer-events: none; }
.btn:hover { transform: translateY(-2px); }
.btn:hover::after, .plat:hover::after { opacity: 1; }
.btn:active { transform: translateY(0) scale(0.97); transition-duration: 60ms; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.55; pointer-events: none; box-shadow: none; }
.btn--quiet { --btn-bg: var(--raised); --btn-fg: var(--text); }
.btn--sm { min-height: 2.75rem; padding-inline: var(--s-4); font-size: var(--fs-small); }
.btn svg { width: 1.125rem; height: 1.125rem; flex: none; transition: transform var(--dur) var(--ease-out); }
.btn:hover svg { transform: translateX(3px); }

 }

/* ---- Icons ---- */
.ico { width: 1.25rem; height: 1.25rem; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.ico-brand { fill: currentColor; stroke: none; }

/* ---- Navbar ---- */
.nav {
  position: sticky;
  inset-block-start: 0;
  z-index: 50;
  height: var(--nav-h);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
}
.nav.is-stuck { box-shadow: 0 1px 0 var(--line); }
.nav__inner { height: 100%; display: flex; align-items: center; gap: var(--s-5); }
.nav__links { display: flex; gap: var(--s-1); margin-inline-start: auto; }
.nav__link {
  padding: var(--s-2) var(--s-3);
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--muted);
  transition: background var(--dur-fast), color var(--dur-fast);
}
.nav__link:hover { background: var(--surface); color: var(--text); }
.nav__link:active { transform: scale(0.96); }
.nav__actions { display: flex; align-items: center; gap: var(--s-3); }
.nav__burger { display: none; width: 2.75rem; height: 2.75rem; border-radius: var(--r-pill); background: var(--surface); place-items: center; }
.nav__burger:active { transform: scale(0.94); }

.brand { white-space: nowrap; flex: none; display: inline-flex; align-items: center; gap: var(--s-3); font-family: var(--font-display); font-weight: 700; font-size: 1rem; letter-spacing: -0.03em; }
.brand__mark { width: 2rem; height: 2rem; color: var(--accent); }

@media (max-width: 62rem) {
  .nav__links {
    position: absolute;
    inset-inline: 0;
    inset-block-start: var(--nav-h);
    flex-direction: column;
    padding: var(--s-3) var(--gutter) var(--s-5);
    background: var(--bg);
    box-shadow: var(--shadow-2);
    transform-origin: top;
    opacity: 0;
    transform: translateY(-0.5rem);
    pointer-events: none;
    visibility: hidden;
    transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out), visibility 0s var(--dur);
  }
  .nav__links.is-open { opacity: 1; transform: none; pointer-events: auto; visibility: visible; transition-delay: 0s; }
  .nav__link { font-size: var(--fs-body); padding: var(--s-3) var(--s-4); }
  .nav__burger { display: grid; }
  .nav__actions { margin-inline-start: auto; }
}
@media (max-width: 40rem) {
  .nav__actions .btn { display: none; }
}
@media (max-width: 26rem) {
  .brand__text { display: none; }
}

/* ---- Rhythm switch (город ⇄ деревня) ---- */
.switch {
  position: relative;
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  padding: 0.25rem;
  border-radius: var(--r-pill);
  background: var(--raised);
  box-shadow: var(--shadow-2);
  isolation: isolate;
}
.switch__thumb {
  position: absolute;
  inset-block: 0.25rem;
  inset-inline-start: 0.25rem;
  width: calc(50% - 0.25rem);
  border-radius: var(--r-pill);
  background: var(--accent);
  z-index: -1;
  transition: transform var(--dur) var(--ease-out);
}
html[data-rhythm="city"] .switch__thumb { transform: translateX(0); }
html[data-rhythm="village"] .switch__thumb { transform: translateX(100%); }
.switch__opt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 2.75rem;
  padding-inline: var(--s-5);
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: var(--fs-small);
  color: var(--muted);
  transition: color var(--dur-fast), transform var(--dur-fast);
}
.switch__opt:hover { color: var(--text); }
.switch__opt:active { transform: scale(0.95); }
.switch__opt[aria-pressed="true"] { color: var(--on-accent); }
.switch--sm .switch__opt { min-height: 2.25rem; padding-inline: var(--s-3); }
.switch--sm .switch__opt span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.switch--sm .switch__opt { padding-inline: var(--s-3); }
.switch--sm { box-shadow: none; background: var(--surface); }
.switch .ico { width: 1.125rem; height: 1.125rem; }

/* ---- Platform row ---- */
.plat {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr) auto 2.75rem;
  align-items: center;
  gap: var(--s-5);
  padding: var(--s-5) var(--s-5);
  border-radius: var(--r-lg);
  background: var(--raised);
  box-shadow: var(--shadow-1);
  position: relative;
  isolation: isolate;
  transition: transform var(--dur) var(--ease-out);
}
.plat:hover { transform: translateY(-3px); }
.plat:active { transform: translateY(0) scale(0.99); }
.plat__icon { width: 3.5rem; height: 3.5rem; display: grid; place-items: center; border-radius: var(--r-md); background: var(--surface); color: var(--accent); }
.plat__icon svg { width: 1.75rem; height: 1.75rem; }
.plat__name { font-family: var(--font-display); font-size: var(--fs-h3); font-weight: 600; letter-spacing: -0.02em; }
.plat__desc { color: var(--muted); font-size: var(--fs-small); margin-block-start: var(--s-1); max-width: 44ch; }
.plat__metric { text-align: end; }
.plat__metric strong { display: block; white-space: nowrap; font-family: var(--font-display); font-size: clamp(1.5rem, 3.4vw, 2.25rem); letter-spacing: -0.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.plat__metric span { font-size: var(--fs-caption); color: var(--muted); }
.plat__go { width: 2.75rem; height: 2.75rem; display: grid; place-items: center; border-radius: 50%; background: var(--accent); color: var(--on-accent); transition: transform var(--dur) var(--ease-out); }
.plat:hover .plat__go { transform: translateX(4px) rotate(-45deg); }

@media (max-width: 46rem) {
  .plat { grid-template-columns: 3rem minmax(0, 1fr) 2.5rem; gap: var(--s-4); padding: var(--s-4); }
  .plat__icon { width: 3rem; height: 3rem; }
  .plat__metric { grid-column: 2; grid-row: 2; text-align: start; display: flex; align-items: baseline; gap: var(--s-2); }
  .plat__metric strong { display: inline; }
  .plat__go { grid-column: 3; grid-row: 1; width: 2.5rem; height: 2.5rem; }
}