/* HeyHi design system: base, layout, type, buttons and the shared pieces of product UI. */

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

html.menu-open,
html:has(dialog[open]) { overflow: hidden; }

body {
  margin: 0;
  background: var(--night-900);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--t-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

img, svg, video, canvas { max-width: 100%; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; }
::selection { background: color-mix(in srgb, var(--signal) 40%, transparent); }
:focus-visible { outline: 2px solid var(--voice); outline-offset: 3px; }
.band--day :focus-visible { outline-color: var(--voice-deep); }

/* Hidden means hidden, even for elements whose class sets a display */
[hidden] { display: none !important; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 16px; top: -100px; z-index: 100; padding: 10px 16px; border-radius: var(--r-sm);
  background: var(--signal); color: var(--night-900); font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 12px; }

/* ---------- Layout ---------- */
.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + 2 * var(--pad));
  margin-inline: auto;
  padding-left: max(var(--pad), env(safe-area-inset-left, 0px));
  padding-right: max(var(--pad), env(safe-area-inset-right, 0px));
}

.band { position: relative; background: var(--bg); color: var(--fg); padding-block: var(--section-y); }
.band--night { --bg: var(--night-900); color-scheme: dark; }
.band--deep { --bg: var(--night-950); color-scheme: dark; }
.band--day {
  --bg: var(--day-0);
  --fg: var(--day-text);
  --muted: var(--day-muted);
  --faint: var(--day-faint);
  --line: var(--day-line);
  --line-strong: var(--day-line-strong);
  --surface: var(--day-1);
  --surface-2: var(--day-2);
  --accent-text: var(--voice-deep);
  --signal-text: var(--signal-deep);
  --ok-text: var(--ok-deep);
  --no-text: var(--no-deep);
  --panel-bg: var(--day-1);
  --panel-shadow: 0 0 0 1px var(--day-line), 0 1px 2px rgba(5, 26, 48, 0.05), 0 28px 70px -30px rgba(5, 26, 48, 0.28);
  color-scheme: light;
}

/* Dark product glass, wherever it sits: product UIs always render on night tokens */
.glass {
  --fg: var(--night-text); --muted: var(--night-muted); --faint: var(--night-faint);
  --line: var(--night-line); --line-strong: var(--night-line-strong);
  --surface: rgba(140, 180, 230, 0.045); --surface-2: rgba(140, 180, 230, 0.085);
  --accent-text: var(--voice); --signal-text: var(--signal); --ok-text: var(--ok); --no-text: var(--no);
  color: var(--fg);
  color-scheme: dark;
}

/* ---------- Type ---------- */
.display { font-size: var(--t-hero); font-stretch: 112%; font-weight: 780; letter-spacing: -0.038em; line-height: 0.98; }
.h2 { font-size: var(--t-h2); font-stretch: 110%; font-weight: 740; letter-spacing: -0.032em; line-height: 1.02; }
.h3 { font-size: var(--t-h3); font-stretch: 104%; font-weight: 650; letter-spacing: -0.015em; line-height: 1.22; }
.lead { font-size: var(--t-lead); line-height: 1.55; color: var(--muted); max-width: 37em; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-stretch: var(--mono-w); }
.tnum { font-variant-numeric: tabular-nums; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-stretch: var(--mono-w); font-size: var(--t-label); font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-text);
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: currentColor; opacity: 0.75; }

/* A section's eyebrow, heading and lead */
.sec-head { display: grid; gap: 22px; max-width: 54rem; margin-bottom: clamp(44px, 5vw, 80px); }

.text-link {
  display: inline-flex; align-items: center; gap: 6px; padding: 0; border: 0; background: none; cursor: pointer;
  color: var(--accent-text); font-weight: 600; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px;
}
.text-link:hover { text-decoration-thickness: 2px; }

/* ---------- Icons and the mark ---------- */
.icon { width: 1.1em; height: 1.1em; flex: none; fill: currentColor; vertical-align: -0.15em; }
.mark { display: block; width: 28px; height: auto; aspect-ratio: 135 / 124; fill: currentColor; color: inherit; }

/* The mark as 12 pieces (shared/_mark_live) that light up in turn, like a voice speaking, while [data-speaking] */
.mark-live { display: block; width: 100%; height: auto; aspect-ratio: 135 / 124; color: inherit; overflow: visible; }
.mark-live .mark-bit { fill: currentColor; }
.mark-live[data-speaking] .mark-bit { animation: mark-sweep 2.4s linear infinite; }
@keyframes mark-sweep {
  0%, 7% { opacity: 1; fill: var(--signal); }
  24% { opacity: 1; fill: currentColor; }
  46%, 100% { opacity: 0.5; fill: currentColor; }
}
.mark-live[data-speaking] .mark-bit--0 { animation-delay: -1.536s; }
.mark-live[data-speaking] .mark-bit--1 { animation-delay: -1.030s; }
.mark-live[data-speaking] .mark-bit--2 { animation-delay: -1.056s; }
.mark-live[data-speaking] .mark-bit--3 { animation-delay: -2.006s; }
.mark-live[data-speaking] .mark-bit--4 { animation-delay: -0.898s; }
.mark-live[data-speaking] .mark-bit--5 { animation-delay: -1.848s; }
.mark-live[data-speaking] .mark-bit--6 { animation-delay: -0.586s; }
.mark-live[data-speaking] .mark-bit--7 { animation-delay: -0.581s; }
.mark-live[data-speaking] .mark-bit--8 { animation-delay: -2.095s; }
.mark-live[data-speaking] .mark-bit--9 { animation-delay: -0.334s; }
.mark-live[data-speaking] .mark-bit--10 { animation-delay: -0.173s; }
.mark-live[data-speaking] .mark-bit--11 { animation-delay: -2.273s; }

/* ---------- Buttons ---------- */
.btn {
  --btn-h: 50px;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: var(--btn-h); padding: 0 24px; border-radius: var(--r-pill); border: 1px solid transparent;
  font-size: 15.5px; font-weight: 620; font-stretch: 106%; letter-spacing: -0.005em; line-height: 1;
  text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: transform 0.2s var(--ease), background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.6; cursor: progress; }
.btn .icon { width: 18px; height: 18px; }
.btn--signal { background: var(--signal); color: var(--night-900); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 12px 32px -12px color-mix(in srgb, var(--signal) 70%, transparent); }
.btn--signal:hover { background: var(--signal-hi); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--fg); border-color: var(--line-strong); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--ink { background: var(--night-900); color: var(--night-text); }
.btn--ink:hover { background: var(--night-700); }
.btn--sm { --btn-h: 40px; padding: 0 17px; font-size: 14px; gap: 8px; }
.btn--sm .icon { width: 16px; height: 16px; }
.btn--block { width: 100%; }

/* ---------- Chips and dots ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px; height: 24px; padding: 0 10px; border-radius: var(--r-pill);
  font-family: var(--font-mono); font-stretch: var(--mono-w); font-size: 11px; font-weight: 500; letter-spacing: 0.03em; line-height: 1; white-space: nowrap;
  color: var(--muted); background: var(--surface-2); border: 1px solid var(--line);
}
.chip .icon { width: 12px; height: 12px; }
.chip .dot { width: 6px; height: 6px; }
.chip--voice, .chip--beta { color: var(--accent-text); background: color-mix(in srgb, var(--voice) 12%, transparent); border-color: color-mix(in srgb, var(--voice) 32%, transparent); }
.chip--signal, .chip--coming-soon { color: var(--signal-text); background: color-mix(in srgb, var(--signal) 13%, transparent); border-color: color-mix(in srgb, var(--signal) 34%, transparent); }
.chip--ok, .chip--live { color: var(--ok-text); background: color-mix(in srgb, var(--ok) 12%, transparent); border-color: color-mix(in srgb, var(--ok) 32%, transparent); }
.chip--no { color: var(--no-text); background: color-mix(in srgb, var(--no) 11%, transparent); border-color: color-mix(in srgb, var(--no) 30%, transparent); }

.dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; flex: none; }
.dot--pulse, .chip--live .dot { animation: dot-pulse 1.8s var(--ease) infinite; }
@keyframes dot-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, currentColor 60%, transparent); }
  70%, 100% { box-shadow: 0 0 0 7px color-mix(in srgb, currentColor 0%, transparent); }
}

/* ---------- Product UI primitives ---------- */
.ui-panel { position: relative; border-radius: var(--r-lg); background: var(--panel-bg); box-shadow: var(--panel-shadow); overflow: hidden; }
.ui-bar {
  display: flex; align-items: center; gap: 12px; min-height: 46px; padding: 0 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-stretch: var(--mono-w); font-size: 11px; letter-spacing: 0.04em; color: var(--muted);
}
.ui-label { font-family: var(--font-mono); font-stretch: var(--mono-w); font-size: 11px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }

/* Voice activity bars: <span class="vbars" data-on><i></i>×5</span> */
.vbars { display: inline-flex; align-items: center; gap: 2px; height: 14px; }
.vbars i { width: 2px; height: 100%; border-radius: 2px; background: currentColor; transform: scaleY(0.25); transform-origin: center; }
.vbars[data-on] i { animation: vbar 0.9s ease-in-out infinite; }
.vbars i:nth-child(2) { animation-delay: -0.2s; }
.vbars i:nth-child(3) { animation-delay: -0.45s; }
.vbars i:nth-child(4) { animation-delay: -0.1s; }
.vbars i:nth-child(5) { animation-delay: -0.6s; }
@keyframes vbar { 0%, 100% { transform: scaleY(0.25); } 50% { transform: scaleY(1); } }

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}