/* Page frame of mockup B «Scena»: rail (→ tab bar under 760px), top strip,
 * menu sheet, footer, section rhythm. Values from tokens.css. */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}
html { scroll-padding-top: 96px; }
.page { margin-left: var(--rail); min-height: 100vh; display: flex; flex-direction: column; }
.page > main { flex: 1; }
.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: calc(var(--section-y) * .6); }
.section--surface { background: var(--color-surface-1); border-block: 1px solid var(--color-line); }

/* ── rail ─────────────────────────────────────────────────────────────── */
.rail {
  position: fixed; inset: 0 auto 0 0; width: var(--rail); z-index: var(--z-rail);
  display: flex; flex-direction: column; align-items: center; padding: 20px 0;
  background: color-mix(in srgb, var(--color-surface-1) 88%, transparent);
  backdrop-filter: var(--blur-glass); -webkit-backdrop-filter: var(--blur-glass);
  border-right: 1px solid var(--color-line);
}
.rail__mark {
  width: 52px; height: 52px; border-radius: var(--radius-md); flex: none;
  background: var(--color-surface-2); color: var(--color-bg); border: 1px solid var(--color-line-strong);
  display: grid; place-items: center; text-decoration: none;
  font: 800 1.5rem/1 var(--font-display); position: relative; overflow: hidden;
  transition: transform var(--dur-base) var(--ease);
}
.rail__mark:hover { transform: rotate(-6deg) scale(1.04); }
.rail__mark::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(115deg, transparent 35%, rgba(255,255,255,.55) 50%, transparent 65%);
  transform: translateX(-120%); animation: shine 5s var(--ease) infinite 1.5s;
}
.rail__nav { display: flex; flex-direction: column; gap: 4px; margin-top: 30px; }
.rail__link {
  width: 76px; display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 11px 4px; border: 0; border-radius: var(--radius-md); background: none;
  text-decoration: none; text-align: center; font: 600 12px/1.15 var(--font-body);
  color: var(--color-muted); position: relative;
  transition: background var(--dur-base), color var(--dur-base);
}
.rail__link .icon { width: 22px; height: 22px; transition: transform var(--dur-base) var(--ease); }
.rail__link:hover { background: var(--color-surface-2); color: var(--color-text); }
.rail__link:hover .icon { transform: translateY(-2px); }
.rail__link[aria-current] { color: var(--color-text); background: var(--color-surface-2); }
.rail__link[aria-current]::before {
  content: ""; position: absolute; left: -10px; top: 14px; bottom: 14px; width: 3px;
  border-radius: 3px; background: var(--color-brand);
}
.rail__bottom { margin-top: auto; display: flex; flex-direction: column; align-items: center; gap: 10px; }

.age-badge {
  width: 44px; height: 44px; border-radius: 50%; flex: none;
  border: 1.5px solid var(--color-line-strong); display: grid; place-items: center;
  font: 700 12px/1 var(--font-display); text-decoration: none; color: var(--color-text);
  transition: border-color var(--dur-base), color var(--dur-base);
}
a.age-badge:hover { border-color: var(--color-mint); color: var(--color-mint); }
.age-badge--lg { width: 56px; height: 56px; font-size: 14px; border-color: var(--color-brand); color: var(--color-brand); }

/* ── top strip ───────────────────────────────────────────────────────── */
.top {
  position: sticky; top: 0; z-index: var(--z-header);
  display: flex; align-items: center; gap: 14px;
  padding: 16px var(--container-pad);
  background: color-mix(in srgb, var(--color-bg) 78%, transparent);
  backdrop-filter: var(--blur-glass); -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--color-line);
  transition: background var(--dur-base), border-color var(--dur-base), padding var(--dur-base) var(--ease);
}
.top--over {
  position: fixed; left: var(--rail); right: 0; padding-block: 22px;
  background: transparent; border-color: transparent; backdrop-filter: none; -webkit-backdrop-filter: none;
}
.top--over.is-scrolled {
  padding-block: 14px;
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: var(--blur-glass); -webkit-backdrop-filter: var(--blur-glass);
  border-color: var(--color-line);
}
.wordmark {
  font: 700 1.35rem/1 var(--font-display); letter-spacing: -.04em; text-decoration: none;
  color: var(--color-text); white-space: nowrap;
}
.wordmark span { color: var(--color-brand); }
.wordmark .logo-pic, .wordmark img { display: block; height: 30px; width: auto; }
.wordmark--lg .logo-pic, .wordmark--lg img { height: 46px; }
.menu-sheet__head .wordmark img { height: 34px; }
.rail__mark picture, .rail__mark img { display: block; width: 34px; height: 34px; position: relative; z-index: 1; }
.top .wordmark { margin-right: auto; }

.search {
  display: flex; align-items: center; gap: 10px; width: min(380px, 40vw);
  padding: 0 6px 0 16px; border-radius: var(--radius-pill);
  background: var(--color-glass); border: 1px solid var(--color-line-strong);
  backdrop-filter: var(--blur-glass); -webkit-backdrop-filter: var(--blur-glass);
  transition: border-color var(--dur-base), background var(--dur-base), width var(--dur-slow) var(--ease);
}
.search:focus-within { border-color: var(--color-brand); background: rgba(16,17,31,.85); box-shadow: var(--focus-ring); }
.search input {
  flex: 1; min-width: 0; padding: 12px 0; border: 0; outline: none; background: none;
  color: var(--color-text); font-size: .95rem;
}
.search input:focus-visible { outline: 2px solid var(--color-brand); outline-offset: 4px; border-radius: 6px; }
.search input::placeholder { color: var(--color-muted); }
.search input::-webkit-search-cancel-button { filter: invert(1); }
.search__go {
  width: 38px; height: 38px; flex: none; border: 0; border-radius: 50%;
  background: var(--color-text); color: var(--color-bg); display: grid; place-items: center;
  transition: transform var(--dur-base) var(--ease), background var(--dur-base);
}
.search__go:hover { transform: scale(1.07); background: var(--color-brand); }
.search__go .icon { width: 18px; height: 18px; }

.ghost-btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 0 18px;
  border-radius: var(--radius-pill); border: 1px solid var(--color-line-strong);
  background: var(--color-glass); color: var(--color-text);
  backdrop-filter: var(--blur-glass); -webkit-backdrop-filter: var(--blur-glass);
  font-weight: 600; font-size: .95rem; text-decoration: none; white-space: nowrap;
  transition: background var(--dur-base), border-color var(--dur-base);
}
.ghost-btn:hover { background: rgba(243,239,230,.12); border-color: var(--color-text); }
.ghost-btn .icon { width: 18px; height: 18px; }

/* ── menu sheet ──────────────────────────────────────────────────────── */
.overlay.overlay--menu { place-items: stretch start; padding: 0; }
.overlay__panel.menu-sheet {
  width: min(100%, 420px); height: 100%; max-height: none; border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin-left: var(--rail); display: flex; flex-direction: column; gap: 24px;
  transform: translateX(-24px);
}
.menu-sheet__head { display: flex; align-items: center; justify-content: space-between; }
.menu-sheet__list { display: grid; gap: 2px; }
.menu-sheet__link {
  display: flex; align-items: baseline; gap: 16px; padding: 12px 8px; border-radius: var(--radius-sm);
  font: 500 1.25rem/1.2 var(--font-display); letter-spacing: -.02em; text-decoration: none;
  transition: background var(--dur-base), color var(--dur-base), padding var(--dur-base) var(--ease);
}
.menu-sheet__link:hover { background: var(--color-surface-2); padding-left: 14px; color: var(--color-brand); }
.menu-sheet__link[aria-current] { color: var(--color-brand); }
.menu-sheet__num { font: 500 .8rem/1 var(--font-display); color: var(--color-subtle); min-width: 22px; }
.menu-sheet__docs { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: var(--fs-small); color: var(--color-muted); padding-top: 16px; border-top: 1px solid var(--color-line); }
.menu-sheet__docs a { text-decoration: none; }
.menu-sheet__docs a:hover { color: var(--color-text); text-decoration: underline; }
.menu-sheet__actions { display: grid; gap: 8px; margin-top: auto; }

/* ── footer ──────────────────────────────────────────────────────────── */
.site-footer {
  margin-top: auto; padding-block: 72px 32px; background: var(--color-surface-1);
  border-top: 1px solid var(--color-line); font-size: var(--fs-small); color: var(--color-muted);
}
.site-footer__top { display: grid; grid-template-columns: minmax(220px, 1fr) 2.4fr; gap: 48px; }
.site-footer__brand p { margin-top: 16px; max-width: 34ch; line-height: 1.6; }
.site-footer__cols { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.site-footer__title { font: 600 .8rem/1.2 var(--font-display); letter-spacing: .1em; text-transform: uppercase; color: var(--color-text); margin-bottom: 14px; }
.site-footer__col ul { display: grid; gap: 4px; }
.site-footer__col a { display: inline-block; padding: 4px 0; text-decoration: none; position: relative; transition: color var(--dur-base); }
.site-footer__col a:hover { color: var(--color-text); }
.site-footer__col a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px; background: var(--color-brand); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-base) var(--ease); }
.site-footer__col a:hover::after { transform: scaleX(1); }
.site-footer__data {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px 28px;
  margin-top: 48px; padding: 22px 24px; border-radius: var(--radius-md);
  background: var(--color-bg); border: 1px solid var(--color-line);
}
.site-footer__data > div { display: grid; gap: 4px; min-width: 0; }
.site-footer__data span:last-child, .site-footer__data a { color: var(--color-text); overflow-wrap: anywhere; }
.site-footer__k { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .1em; color: var(--color-subtle); }
.site-footer__rg { display: flex; align-items: center; gap: 18px; margin-top: 28px; }
.site-footer__rg p { max-width: 80ch; line-height: 1.6; }
.site-footer__rg a { color: var(--color-text); }
.site-footer__bottom {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--color-line);
}

/* ── back to top ─────────────────────────────────────────────────────── */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: var(--z-header);
  width: 48px; height: 48px; border: 1px solid var(--color-line-strong); border-radius: 50%;
  background: var(--color-surface-2); color: var(--color-text); display: grid; place-items: center;
  box-shadow: var(--shadow-card); transition: transform var(--dur-base) var(--ease), background var(--dur-base);
}
.to-top:hover { transform: translateY(-3px); background: var(--color-brand); color: var(--color-on-brand); }

/* ── tablet ──────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .site-footer__top { grid-template-columns: 1fr; gap: 32px; }
  .site-footer__data { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ── mobile: rail → bottom tab bar ───────────────────────────────────── */
@media (max-width: 760px) {
  :root { --rail: 0px; }
  .rail {
    inset: auto 0 0 0; width: auto; height: calc(var(--tabbar) + env(safe-area-inset-bottom));
    flex-direction: row; padding: 0 6px env(safe-area-inset-bottom);
    border-right: 0; border-top: 1px solid var(--color-line);
  }
  .rail__mark, .rail__bottom, .rail__link--wide { display: none; }
  .rail__nav { flex-direction: row; margin: 0; width: 100%; justify-content: space-around; gap: 0; }
  .rail__link { width: auto; flex: 1; padding: 8px 2px; font-size: 12px; }
  .rail__link[aria-current]::before { left: 30%; right: 30%; top: -1px; bottom: auto; width: auto; height: 3px; }
  html { scroll-padding-top: 150px; }   /* mobile top strip is two rows (logo + search) */
  .page { padding-bottom: calc(var(--tabbar) + env(safe-area-inset-bottom)); }
  .top, .top--over { left: 0; flex-wrap: wrap; gap: 10px; padding: 12px 16px; }
  .top .search { order: 3; width: 100%; }
  .ghost-btn span { display: none; }
  .ghost-btn { padding: 0 13px; }
  .overlay__panel.menu-sheet { margin-left: 0; width: 100%; border-radius: 0; padding-bottom: calc(var(--tabbar) + 24px); }
  .site-footer { padding-block: 56px 24px; }
  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 16px; }
  .site-footer__rg { align-items: flex-start; }
  .to-top { bottom: calc(var(--tabbar) + 16px); right: 16px; }
}

/* tap targets ≥24px by pseudo-element (invariant 7), layout untouched */
.wordmark, .site-footer__data a { position: relative; }
.wordmark::after, .site-footer__data a::after { content: ""; position: absolute; inset: 50% 0 auto 0; translate: 0 -50%; height: 100%; min-height: 32px; }