/* Tab headers: one flat surface from Telegram's own header down to the page, one title that shrinks into the bar.
   Motion is transform and opacity only. */
:root {
  --nav-h: 52px;
  --avatar-c1: color-mix(in srgb, var(--accent) 72%, #fff);
  --avatar-c2: var(--accent);
  --hd-lift: 0 1px 6px rgba(0, 0, 0, .07);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --hd-lift: 0 1px 8px rgba(0, 0, 0, .34); }
}
:root[data-theme="dark"] { --hd-lift: 0 1px 8px rgba(0, 0, 0, .34); }

.screen { --large-size: 34px; --large-line: 41px; --hero-size: 24px; --hero-line: 30px; }

/* Top bar. Its background comes in only as far as the text on it needs, and it ends in a fade, not a line. */
.navbar { position: absolute; left: 0; right: 0; top: 0; z-index: 10; padding-top: var(--safe-top); pointer-events: none; }
.navbar-bg {
  position: absolute; left: 0; right: 0; top: 0; bottom: -18px; opacity: 0; will-change: opacity;
  background: color-mix(in srgb, var(--bg) 76%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(170%);
  backdrop-filter: blur(16px) saturate(170%);
  -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 26px), transparent);
  mask-image: linear-gradient(to bottom, #000 calc(100% - 26px), transparent);
}
.navbar-row { position: relative; height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; padding-inline: calc(var(--gutter) + var(--safe-left)) calc(var(--gutter) + var(--safe-right)); }
.navbar-side { min-width: 36px; display: flex; align-items: center; gap: 8px; z-index: 1; pointer-events: auto; }
.navbar-trail { justify-content: flex-end; }
.navbar-center { position: absolute; top: 0; bottom: 0; left: calc(64px + var(--safe-left)); right: calc(64px + var(--safe-right)); display: flex; align-items: center; justify-content: center; }
.navbar-title { min-width: 0; font-weight: 600; font-size: 17px; line-height: 22px; letter-spacing: -.02em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* The title itself. nav.js owns its transform: it starts over the slot in the page and lands on the bar's centre line. */
.hd-glide { position: absolute; left: 0; top: 0; z-index: 2; transform-origin: 0 0; white-space: nowrap; pointer-events: none; }
.hd-glide.is-gliding { will-change: transform; }
/* A short page still scrolls far enough for the title to land. */
.screen--glides .screen-body { min-height: calc(100% + 72px); }

.navbtn {
  position: relative; width: 40px; height: 40px; border-radius: 20px; display: inline-flex; align-items: center; justify-content: center; flex: none;
  background: var(--glass-tint);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  backdrop-filter: blur(16px) saturate(180%);
  box-shadow: var(--hd-lift), inset 0 .5px 0 var(--glass-edge), inset 0 0 0 .5px var(--glass-line);
}
.navbtn::after { content: ""; position: absolute; inset: -4px; }
.navbtn--flat { width: 32px; height: 32px; background: var(--fill); box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; color: var(--hint); }
.navbtn--flat::after { inset: -6px; }
.in-telegram .navbtn-back { display: none; }
.navbtn[aria-pressed="true"] { color: #f5b301; }

/* Avatar: the same face on the button and in the hero */
.hd-face {
  width: 100%; height: 100%; border-radius: 50%; overflow: hidden; display: flex; align-items: center; justify-content: center; flex: none;
  font-weight: 600; font-size: 14px; line-height: 1; letter-spacing: -.01em; color: var(--text); background: var(--fill);
}
.hd-face.is-filled { color: #fff; background: linear-gradient(160deg, var(--avatar-c1), var(--avatar-c2)); }
.hd-face img { display: block; width: 100%; height: 100%; object-fit: cover; }
.hd-avatar { width: 36px; height: 36px; border-radius: 18px; background: none; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; }

/* Head */
.screen-head { position: relative; display: flex; flex-direction: column; align-items: flex-start; padding: 0 calc(var(--gutter) + var(--safe-right)) 14px calc(var(--gutter) + var(--safe-left)); }
.hd-slot--large { flex: none; height: var(--large-line); }
.hd-slot--hero { flex: none; height: var(--hero-line); }
.large-title {
  max-width: calc(100% - 2 * var(--gutter) - var(--safe-left) - var(--safe-right));
  font: 700 var(--large-size)/var(--large-line) var(--font-display); letter-spacing: -.024em; overflow: hidden; text-overflow: ellipsis;
}
.screen--compact .large-title { max-width: calc(100% - 2 * var(--gutter) - var(--safe-left) - var(--safe-right) - 48px); }
.hd-meta { display: flex; align-items: center; gap: 10px; max-width: 100%; min-height: 18px; }
.hd-meta > * { flex: none; }

/* Profile hero */
.hd-hero { align-items: center; padding-top: 6px; padding-bottom: 22px; text-align: center; }
.hd-hero-face { width: 88px; height: 88px; margin-bottom: 12px; transform-origin: 50% 100%; will-change: transform, opacity; }
.hd-hero-face .hd-face { font-size: 32px; letter-spacing: -.02em; }
.hd-hero-name { max-width: calc(100% - 2 * var(--gutter)); font: 700 var(--hero-size)/var(--hero-line) var(--font-display); letter-spacing: -.022em; overflow: hidden; text-overflow: ellipsis; }
.hd-hero-user { max-width: 100%; font-size: 15px; line-height: 20px; color: var(--hint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hd-hero-user[hidden] { display: none; }

/* The brand mark at the foot of Profile */
.app-sign { display: flex; align-items: center; justify-content: center; gap: 5px; padding: 2px 0 6px; color: var(--hint); font-size: 13px; line-height: 18px; letter-spacing: -.005em; opacity: .75; }
.logo-mark { display: block; flex: none; }

/* Live example in the kit */
.hd-preview { --safe-top: 0px; position: relative; height: 204px; border-radius: var(--r-group); overflow: hidden; box-shadow: inset 0 0 0 .5px var(--sep); isolation: isolate; }
.hd-preview { container-type: inline-size; }
.hd-preview .screen-scroll { padding-bottom: 12px; overscroll-behavior-y: auto; }
@container (max-width: 340px) { .hd-preview .market-spark { display: none; } }

@container app (max-width: 350px) {
  .screen { --large-size: 30px; --large-line: 37px; --hero-size: 22px; --hero-line: 28px; }
}