/* ==========================================================================
   UBridge
   Calm by design: whitespace separates things, one blue accent, few frames
   (the hero window and the install card).
   The page moves gently: the hero plays once on load, and sections fade up
   as they scroll in (see "Motion" at the end).
   ========================================================================== */

:root {
  /* ---- Page (light) ---- */
  --paper:   #ffffff;
  --paper-2: #f5f7fa;   /* the two or three alternate sections */
  --surface: #ffffff;   /* the install card, the hero window */
  --ink:     #0a1b2d;   /* the logo's navy, used as text */
  --muted:   #45526a;   /* secondary text */
  --soft:    #5a6780;   /* captions, notes */
  --accent:  #0b63d6;   /* links, icons */
  --line:    rgba(10, 27, 45, .1);
  --line-strong: rgba(10, 27, 45, .17);

  --btn: #0b63d6;                  /* button fill, white text 5.6:1 */
  --btn-hover: #0956bb;
  --btn2-bg: #ffffff;
  --btn2-line: rgba(10, 27, 45, .18);
  --ok: #0f7543;                   /* "done" text */
  --ok-btn: #0f7543;               /* green button fill, white text 5.8:1 */
  --ok-soft: #e1f4ea;
  --amber-ink: #6e4a00;
  --amber-bg: #fff3d1;
  --amber-line: #f0d48a;
  --amber-dot: #d39b22;

  --frame-line: rgba(10, 27, 45, .1);
  --frame-shadow: 0 1px 2px rgba(10, 27, 45, .05), 0 18px 40px -22px rgba(10, 27, 45, .28);
  --hero-shadow: 0 2px 6px rgba(10, 27, 45, .06), 0 40px 80px -36px rgba(10, 27, 45, .36);
  --lift-shadow: 0 2px 4px rgba(10, 27, 45, .05), 0 24px 48px -24px rgba(10, 27, 45, .3);
  --show-light: block;
  --show-dark: none;

  --header-bg: rgba(255, 255, 255, .8);
  --header-line: rgba(10, 27, 45, .08);
  --hover: rgba(10, 27, 45, .05);

  /* ---- The bridge and the headline accent ---- */
  --headline-accent: #006dfd;      /* "Unofficially", large text */
  --arc: #006dfd;
  --arc-soft: #75abfa;
  --hero-arc: rgba(0, 109, 253, .5);   /* the thin arch over the hero window */
  --app-canvas: #e9edf2;           /* the add-on's own window background (from its screenshots) */
  --seg-track: #edf0f4;            /* the hero's tab switcher, like the add-on's own */
  --seg-on: #ffffff;
  --seg-on-ink: #0b5bc4;
  --seg-on-ring: 0 1px 3px rgba(10, 27, 45, .16), 0 0 0 1px rgba(11, 99, 214, .32);
  --stack-back: #90bbfa;
  --stack-mid: #c1d8fb;

  /* ---- Type: five sizes ---- */
  --font-display: "Helvetica Neue", "Inter Tight", Helvetica, Arial, sans-serif;
  --font-text: "Hanken Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --fs-small: .9375rem;
  --fs-body: 1.0625rem;
  --fs-h3: 1.25rem;                /* also the lead size */
  --fs-h2: clamp(1.875rem, 1.35rem + 1.7vw, 2.75rem);
  --fs-h1: clamp(2.375rem, 1.25rem + 3.7vw, 4.25rem);

  /* ---- Space, radius, layout, motion ---- */
  --r-1: 5px; --r-2: 8px; --r-3: 12px; --r-card: 16px; --r-pill: 999px;
  --gutter: clamp(16px, 5vw, 48px);
  /* the gutter, or the notch / rounded-corner inset if that's wider (iPhone in landscape) */
  --side: max(var(--gutter), env(safe-area-inset-left, 0px), env(safe-area-inset-right, 0px));
  --safe-top: env(safe-area-inset-top, 0px);
  --max: 1200px;
  --header-h: 64px;
  --section-y: clamp(52px, 5.2vw, 72px);
  --head-gap: clamp(28px, 3.2vw, 40px);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---- Dark theme: the system preference, unless the visitor picked light ---- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:   #08121e;
    --paper-2: #0c1828;
    --surface: #101e30;
    --ink:     #e8eef7;
    --muted:   #b3bfd2;
    --soft:    #98a6bd;
    --accent:  #6cb0ff;
    --line:    rgba(200, 218, 245, .1);
    --line-strong: rgba(200, 218, 245, .17);
    --btn: #1a6ae0;
    --btn-hover: #1560cc;
    --btn2-bg: #101e30;
    --btn2-line: rgba(200, 218, 245, .22);
    --ok: #43d494;
    --ok-btn: #12804b;
    --ok-soft: #0f2f25;
    --amber-ink: #f6cd6e;
    --amber-bg: #2e2309;
    --amber-line: #5c4611;
    --amber-dot: #f0b43c;
    --frame-line: rgba(255, 255, 255, .1);
    --frame-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 20px 44px -22px rgba(0, 0, 0, .75);
    --hero-shadow: 0 2px 6px rgba(0, 0, 0, .3), 0 40px 80px -30px rgba(0, 0, 0, .75);
    --lift-shadow: 0 2px 4px rgba(0, 0, 0, .3), 0 24px 48px -22px rgba(0, 0, 0, .8);
    --show-light: none;
    --show-dark: block;
    --header-bg: rgba(8, 18, 30, .78);
    --header-line: rgba(200, 218, 245, .1);
    --hover: rgba(255, 255, 255, .06);
    --headline-accent: #8cbcff;
    --arc: #1f78ff;
    --arc-soft: #75abfa;
    --hero-arc: rgba(117, 171, 250, .5);
    --app-canvas: #21262f;
    --seg-track: #0e1a2a;
    --seg-on: #1b2d47;
    --seg-on-ink: #d3e6fc;
    --seg-on-ring: 0 1px 3px rgba(0, 0, 0, .4), 0 0 0 1px rgba(108, 176, 255, .5);
    --stack-back: rgba(31, 120, 255, .42);
    --stack-mid: rgba(31, 120, 255, .26);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
    --paper:   #08121e;
    --paper-2: #0c1828;
    --surface: #101e30;
    --ink:     #e8eef7;
    --muted:   #b3bfd2;
    --soft:    #98a6bd;
    --accent:  #6cb0ff;
    --line:    rgba(200, 218, 245, .1);
    --line-strong: rgba(200, 218, 245, .17);
    --btn: #1a6ae0;
    --btn-hover: #1560cc;
    --btn2-bg: #101e30;
    --btn2-line: rgba(200, 218, 245, .22);
    --ok: #43d494;
    --ok-btn: #12804b;
    --ok-soft: #0f2f25;
    --amber-ink: #f6cd6e;
    --amber-bg: #2e2309;
    --amber-line: #5c4611;
    --amber-dot: #f0b43c;
    --frame-line: rgba(255, 255, 255, .1);
    --frame-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 20px 44px -22px rgba(0, 0, 0, .75);
    --hero-shadow: 0 2px 6px rgba(0, 0, 0, .3), 0 40px 80px -30px rgba(0, 0, 0, .75);
    --lift-shadow: 0 2px 4px rgba(0, 0, 0, .3), 0 24px 48px -22px rgba(0, 0, 0, .8);
    --show-light: none;
    --show-dark: block;
    --header-bg: rgba(8, 18, 30, .78);
    --header-line: rgba(200, 218, 245, .1);
    --hover: rgba(255, 255, 255, .06);
    --headline-accent: #8cbcff;
    --arc: #1f78ff;
    --arc-soft: #75abfa;
    --hero-arc: rgba(117, 171, 250, .5);
    --app-canvas: #21262f;
    --seg-track: #0e1a2a;
    --seg-on: #1b2d47;
    --seg-on-ink: #d3e6fc;
    --seg-on-ring: 0 1px 3px rgba(0, 0, 0, .4), 0 0 0 1px rgba(108, 176, 255, .5);
    --stack-back: rgba(31, 120, 255, .42);
    --stack-mid: rgba(31, 120, 255, .26);
    color-scheme: dark;
}
:root[data-theme="light"] { color-scheme: light; }

/* ==========================================================================
   Base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  background: var(--paper);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + var(--safe-top) + 16px);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: var(--fs-body);
  line-height: 1.6;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;                /* Safari before 16, which lacks clip */
  overflow-x: clip;
}

img, svg, picture { max-width: 100%; }
img { display: block; height: auto; }
picture img { width: 100%; }
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; }
a {
  color: var(--accent);
  text-underline-offset: .18em; text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
  transition: color .25s var(--ease), text-decoration-color .25s var(--ease);
}
@media (hover: hover) { a:hover { text-decoration-color: currentColor; } }
strong, b { font-weight: 700; }
button { font: inherit; color: inherit; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

/* The mark's colours, as tokens */
.mk-blue { stroke: var(--arc); }
.mk-dot { fill: var(--arc); }
.mk-soft { stroke: var(--arc-soft); }
.mk-stack-back { fill: var(--stack-back); }
.mk-stack-mid { fill: var(--stack-mid); }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
main:focus, [tabindex="-1"]:focus { outline: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap;
}
.anchor-alias { position: absolute; top: 0; left: 0; width: 1px; height: 1px; }   /* old #loop, #two-ways, #proof links land here */

.skip-link {
  position: absolute; left: 16px; top: -100px; z-index: 100;
  background: var(--surface); color: var(--ink);
  padding: 10px 16px; border-radius: var(--r-2);
  font-weight: 600; box-shadow: var(--lift-shadow);
}
.skip-link:focus { top: calc(env(safe-area-inset-top, 0px) + 12px); }

.container {
  width: min(100% - 2 * var(--side), var(--max));
  margin-inline: auto;
}

/* Theme-swapped screenshots: one copy shows, the other is display:none (not read twice, not downloaded) */
.only-light { display: var(--show-light); }
.only-dark { display: var(--show-dark); }

/* ==========================================================================
   Type
   ========================================================================== */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  text-wrap: balance;
}
h1, h2 { letter-spacing: -0.03em; line-height: 1.08; }
h2 { font-size: var(--fs-h2); }
h3, h4 { font-size: var(--fs-h3); line-height: 1.3; letter-spacing: -0.015em; }
p { text-wrap: pretty; }
.lead { font-size: var(--fs-h3); line-height: 1.5; color: var(--muted); text-wrap: balance; }

/* App UI labels (Find Questions, Copy & mark used...) */
.ui { font-weight: 700; color: var(--ink); }
.mono { font-family: var(--font-mono); font-size: .92em; }
.nobr { white-space: nowrap; }
kbd {
  font-family: var(--font-mono); font-size: .85em;
  padding: .05em .4em; border-radius: var(--r-1);
  border: 1px solid var(--line-strong); border-bottom-width: 2px; background: var(--surface);
  white-space: nowrap;
}

/* ==========================================================================
   Buttons, links, pills
   ========================================================================== */
.btn {
  -webkit-appearance: none; appearance: none;
  -webkit-tap-highlight-color: transparent;    /* the press itself shows (scale) */
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: var(--r-2);
  font-family: var(--font-text);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease),
              transform .35s var(--ease), box-shadow .35s var(--ease);
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary { background: var(--btn); color: #fff; box-shadow: 0 1px 2px rgba(10, 27, 45, .16); }
.btn-secondary { background: var(--btn2-bg); color: var(--ink); border-color: var(--btn2-line); }
.btn-lg { min-height: 50px; padding: 12px 22px; font-size: 1.0625rem; }
.btn-sm { min-height: 38px; padding: 7px 15px; font-size: .9375rem; }
.btn:active { transform: scale(.98); transition-duration: .12s; }
@media (hover: hover) {
  .btn:hover { transform: translateY(-1px); }
  .btn-primary:hover { background: var(--btn-hover); box-shadow: 0 10px 22px -12px color-mix(in srgb, var(--btn) 85%, transparent); }
  .btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
  .btn:active { transform: scale(.98); }
}

/* The arrow that nudges forward on hover */
.arrow { transition: transform .4s var(--ease); }
.btn .arrow { width: 18px; height: 18px; margin-right: -3px; }
@media (hover: hover) { .btn:hover .arrow, .arrow-link:hover .arrow { transform: translateX(3px); } }
.arrow-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; text-decoration: none; }
.arrow-link .arrow { width: 16px; height: 16px; flex: none; }
.arrow-link:active { text-decoration: underline; }
@media (hover: hover) { .arrow-link:hover { text-decoration: underline; } }

/* The main call to action: a soft sheen sweeps across once per hover */
.btn-cta { position: relative; overflow: hidden; }
.btn-cta::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(100deg, transparent 25%, rgba(255, 255, 255, .26) 50%, transparent 75%);
  transform: translateX(-110%);
}
@media (hover: hover) {
  .btn-cta:hover::after { transform: translateX(110%); transition: transform .9s var(--ease); }
}

.soon-pill {
  display: inline-flex; align-items: center; gap: 8px;
  width: fit-content; max-width: 100%;
  font-family: var(--font-text);
  font-size: .875rem; font-weight: 700; line-height: 1.3;
  padding: 6px 13px 6px 11px;
  border-radius: var(--r-pill);
  color: var(--amber-ink);
  background: var(--amber-bg);
  border: 1px solid var(--amber-line);
}
.soon-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--amber-dot); flex: none; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .875rem; font-weight: 700;
  padding: 6px 13px 6px 11px;
  border-radius: var(--r-pill);
  width: fit-content; max-width: 100%;
}
.badge--live { color: var(--ok); border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent); background: var(--ok-soft); }
.badge--live::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ok); flex: none; }

/* ==========================================================================
   Header (follows the theme, blurred)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: calc(var(--header-h) + var(--safe-top));
  padding-top: var(--safe-top);      /* a home-screen web app draws under the status bar */
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--header-line);
}
.header-inner { height: 100%; display: flex; align-items: center; gap: 24px; }

.wordmark {
  display: inline-flex; align-items: center; gap: 10px;
  text-decoration: none; color: inherit;
  margin-right: auto;
  border-radius: 6px;
}
.wm-mark { width: 62px; height: 21px; flex: none; overflow: visible; transition: transform .5s cubic-bezier(.3, 1.5, .5, 1); transform-origin: 50% 60%; }
@media (hover: hover) { .wordmark:hover .wm-mark { transform: rotate(-6deg) translateY(-1px); } }
.wm-text { display: inline-flex; flex-direction: column; line-height: 1; gap: 4px; }
.wm-name { font-family: var(--font-display); font-weight: 700; font-size: 1.375rem; letter-spacing: -0.035em; }
.wm-u { color: var(--ink); }
.wm-b { color: var(--arc); }
.wm-tag {
  font-size: .5625rem; font-weight: 700; letter-spacing: .2em; text-transform: uppercase;
  color: var(--soft);
  display: inline-flex; align-items: center; gap: .35em;
}
.wm-arrows { display: inline-block; transition: transform .6s cubic-bezier(.3, 1.4, .5, 1); }
@media (hover: hover) { .wordmark:hover .wm-arrows { transform: rotate(180deg); } }

.site-nav { position: relative; }
.nav-links { list-style: none; display: flex; gap: 2px; }
.nav-links a {
  display: inline-flex; align-items: center;
  min-height: 40px; padding: 8px 12px;
  border-radius: var(--r-2);
  color: var(--muted); text-decoration: none;
  font-weight: 600; font-size: var(--fs-small); white-space: nowrap;
}
@media (hover: hover) { .nav-links a:hover { color: var(--ink); } }
/* The underline that slides to the hovered link (script.js places it) */
.nav-ink {
  position: absolute; left: 0; bottom: 3px;
  width: 100px; height: 2px; border-radius: 2px;
  background: var(--accent);
  transform-origin: 0 50%;
  transform: translateX(var(--x, 0)) scaleX(var(--s, 0));
  opacity: 0;
  pointer-events: none;
  transition: transform .45s var(--ease), opacity .3s var(--ease);
}
.nav-ink.is-on { opacity: 1; }
.nav-ink.is-jump { transition: opacity .3s var(--ease); }
.header-actions { display: flex; align-items: center; gap: 8px; margin-left: 8px; }
.btn-dl { gap: 7px; padding-inline: 13px 15px; }
.btn-dl svg { width: 17px; height: 17px; }

.icon-btn {
  -webkit-appearance: none; appearance: none;
  -webkit-tap-highlight-color: transparent;
  padding: 0;
  width: 40px; height: 40px;
  display: inline-grid; place-items: center;
  border-radius: var(--r-2);
  border: 1px solid var(--btn2-line);
  background: transparent; color: var(--ink);
  cursor: pointer;
  transition: background-color .25s var(--ease), border-color .25s var(--ease);
}
.icon-btn:active { background: var(--hover); }
@media (hover: hover) { .icon-btn:hover { background: var(--hover); } }
.icon-btn svg { width: 19px; height: 19px; }
/* Theme toggle: the three icons share one cell and cross-fade */
.theme-toggle .ti {
  grid-area: 1 / 1;
  opacity: 0; transform: rotate(-60deg) scale(.6);
  transition: opacity .35s var(--ease), transform .5s var(--ease);
}
.theme-toggle[data-mode="system"] .ti-system,
.theme-toggle[data-mode="light"] .ti-light,
.theme-toggle[data-mode="dark"] .ti-dark { opacity: 1; transform: none; }
html:not(.js) .theme-toggle { display: none; }          /* it needs JS to work */
.menu-toggle { display: none; }
.menu-toggle .mi-close { display: none; }
.menu-toggle[aria-expanded="true"] .mi-open { display: none; }
.menu-toggle[aria-expanded="true"] .mi-close { display: block; }

@media (max-width: 919px) {
  .header-inner { gap: 12px; }
  .site-nav { order: 3; }
  .nav-ink { display: none; }
  /* Without JS, the links stay visible as a scrollable row under the bar */
  html:not(.js) .site-header { height: auto; }
  html:not(.js) .header-inner { flex-wrap: wrap; padding-block: 10px 4px; }
  html:not(.js) .site-nav { width: 100%; }
  html:not(.js) .nav-links { flex-wrap: wrap; margin-inline: -10px; }
  html:not(.js) .nav-links a { padding-inline: 10px; }
  .js .menu-toggle { display: inline-grid; }
  .js .site-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--surface);         /* solid: a nested backdrop-filter can't blur through the header's */
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -16px rgba(3, 12, 24, .3);
    padding: 8px var(--side) 16px;
    display: none;
  }
  .js .site-header.menu-open .site-nav { display: block; animation: ub-menu .35s var(--ease); }
  .js .nav-links { flex-direction: column; gap: 0; }
  .js .nav-links a { width: 100%; min-height: 50px; font-size: var(--fs-body); color: var(--ink); border-radius: 0; }
  .js .nav-links li + li a { border-top: 1px solid var(--line); }
}
@media (max-width: 479px) {          /* phones: a more compact bar, since the Download button stays in it */
  .header-inner { gap: 8px; }
  .wm-mark { width: 42px; height: 14px; }
  .wordmark { gap: 7px; min-height: 44px; }
  .wm-name { font-size: 1.1875rem; }
  .wm-tag { font-size: .5rem; letter-spacing: .16em; }
  .header-actions { gap: 6px; margin-left: 0; }
  .icon-btn { width: 44px; height: 44px; }    /* Apple's minimum tap target */
  .header-actions .btn-sm { min-height: 44px; padding-inline: 12px 13px; font-size: .9375rem; }
  .btn-dl { gap: 6px; }
  .btn-dl svg { width: 16px; height: 16px; }
}
@media (max-width: 399px) {
  .wm-tag { display: none; }                  /* the name alone, so the bar still fits */
  .header-actions { gap: 4px; }
  .header-actions .btn-sm { padding-inline: 11px 12px; }
}
@media (max-width: 369px) {          /* small Android phones: the Download button drops its icon */
  .btn-dl svg { display: none; }
}
@media (max-width: 339px) {          /* 320px (iPhone SE or mini with Larger Text zoom): the name alone, no mark */
  .site-header .wm-mark { display: none; }
}

/* ==========================================================================
   Hero: one centred reading path (headline, one sentence, Download),
   then the app itself under a thin arch
   ========================================================================== */
.hero {
  position: relative;
  padding-block: clamp(40px, 4.6vw, 68px) clamp(56px, 6.5vw, 88px);
  text-align: center;
  overflow-x: hidden;                /* Safari before 16 */
  overflow-x: clip;
}
.hero-copy { display: flex; flex-direction: column; align-items: center; }
.hero h1 {
  font-size: var(--fs-h1);
  line-height: 1.04;
  letter-spacing: -0.04em;
}
.h1-line { display: block; }
.w { display: inline-block; }
.h1-accent { position: relative; color: var(--headline-accent); }
.swoosh {                    /* the brand-blue swoosh under "Unofficially" */
  position: absolute; left: -1%; bottom: -.1em;
  width: 102%; height: .2em;
  overflow: visible; pointer-events: none;
}
.swoosh path { fill: none; stroke: var(--arc); stroke-width: 3.6; stroke-linecap: round; }
.h1-arrows { width: .8em; vertical-align: -0.03em; color: var(--arc); }
.h1-arrows svg { display: block; width: 100%; height: auto; overflow: visible; }

/* The lead: the UWorld -> Anki job first (in ink), the way back second (quieter). Each its own line. */
.hero-lead {
  margin-top: 24px;
  max-width: 34em;
  font-size: clamp(1.125rem, 1.02rem + .45vw, 1.375rem);
  line-height: 1.45;
  color: var(--muted);
}
.lead-1, .lead-2 { display: block; }
.lead-1 { color: var(--ink); font-weight: 500; }
.lead-2 { margin-top: 2px; }
.hero-ctas {
  display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 14px 28px;
  margin-top: 32px;
}
.hero-more { font-size: var(--fs-body); min-height: 44px; }   /* a full-size tap target */
/* The recommended extension: one quiet line under the buttons */
.hero-ext { margin-top: 18px; font-size: var(--fs-small); color: var(--muted); text-wrap: balance; }
.hero-ext a { font-weight: 600; }
@media (max-width: 599px) and (max-height: 600px) { .hero-ext { display: none; } }   /* the shortest phones: the independence note keeps its place on the first screen; Install says it again */
/* One quiet line: Free · platforms · the independence note that the headline's "Unofficially" points to */
.facts {
  list-style: none;
  margin-top: 20px;
  display: flex; flex-wrap: wrap; justify-content: center;
  font-size: .875rem; line-height: 1.5;
  color: var(--soft);
}
.facts li:not(:last-child)::after { content: "·"; margin-inline: .6em; }
.facts strong { color: var(--muted); font-weight: 700; }
@media (max-width: 879px) {          /* the independence note gets its own row, no dot left hanging */
  .facts li:nth-child(2)::after { content: none; }
  .facts .fact-indep { flex-basis: 100%; margin-top: 2px; text-wrap: balance; }
}

/* ---- The app window, with one thin arch over it (the logo's bridge, quietly) ---- */
.hero-visual { margin-top: clamp(32px, 2.8vw, 40px); }
.hero-shot {
  position: relative;
  width: min(100%, 960px);
  margin-inline: auto;
  transform-origin: 50% 0;
}
.hero-arc {
  position: absolute; left: 0; top: 0; z-index: 0;
  width: 100%; height: auto;
  translate: 0 -96%;                  /* its feet (y = 96 of 100) sit on the window's top edge */
  overflow: visible; pointer-events: none;
}
.hero-arc path { fill: none; stroke: var(--hero-arc); stroke-width: 2.2; stroke-linecap: round; }
.win {
  position: relative; z-index: 1;
  aspect-ratio: 1200 / 904;           /* both tabs share one frame, so switching never jumps */
  border-radius: var(--r-3);
  overflow: hidden;
  isolation: isolate;
  background: var(--app-canvas);      /* a shorter shot ends on the add-on's own background */
  box-shadow: 0 0 0 1px var(--frame-line), var(--hero-shadow);
}
.hero-caption { margin-top: 18px; font-size: var(--fs-small); color: var(--soft); text-wrap: balance; }

/* ---- The two tabs, drawn like the add-on's own switch: a sunken track, the chosen tab raised ---- */
.shot-tabs {
  display: flex; gap: 3px;
  width: fit-content;
  position: relative; z-index: 2;     /* wide screens: it sits in the arch, like a keystone */
  margin: 0 auto max(10px, 7.2% - 30px);   /* the arch's crown (7.2% of the window's width up) meets its middle */
  padding: 3px;
  border-radius: 11px;
  background: var(--seg-track);
  border: 1px solid var(--line-strong);
  box-shadow: inset 0 1px 2px rgba(10, 27, 45, .06);
}
.shot-tabs[hidden] { display: none; }
.shot-tab {
  -webkit-appearance: none; appearance: none;
  -webkit-tap-highlight-color: transparent;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 44px;
  padding: 6px 20px 6px 15px;
  border: 0; border-radius: 8px;
  background: transparent;
  font: 600 .9375rem/1.2 var(--font-text);
  color: var(--muted);
  text-align: left;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);
}
.shot-tab:hover { color: var(--ink); }
.shot-tab[aria-selected="true"] { background: var(--seg-on); color: var(--seg-on-ink); box-shadow: var(--seg-on-ring); cursor: default; }
.shot-tab:focus-visible { outline-offset: 2px; border-radius: 8px; }
.shot-tab-icon { width: 18px; height: 18px; flex: none; }
.shot-tab-text { display: flex; flex-direction: column; }
.shot-tab-name { white-space: nowrap; }
.shot-tab-dir { font-size: .75rem; font-weight: 500; color: var(--soft); white-space: nowrap; }
.shot-tab[aria-selected="true"] .shot-tab-dir { color: inherit; }

/* ---- Both tabs' shots share one cell: the new one fades in on top, then the old one hides ---- */
.shot-stage { position: relative; display: grid; }
.shot-panel { grid-area: 1 / 1; min-width: 0; }
.shot-panel[hidden] { display: none; }
.shot-panel.is-on { z-index: 1; transition: opacity .38s var(--ease); }
.shot-panel.is-off { opacity: 0; visibility: hidden; transition: opacity 0s .38s, visibility 0s .38s; pointer-events: none; }
.shot-panel.is-off .hero-caption { opacity: 0; transition: opacity .12s; }   /* the old line leaves first */
.shot-panel.is-on.is-entering { opacity: 0; transition: none; }
#shot-fq .win, #shot-fq .hero-caption { animation: none; }   /* only the first tab plays the load-in */

@media (max-width: 599px) {
  .h1-line { display: inline; }
  .lead { font-size: var(--fs-body); }
  .hero-lead { margin-top: 18px; font-size: 1.125rem; }
  .lead-q, .lead-a { display: block; }        /* phones: one thought per line */
  .lead-2 { margin-top: 6px; text-wrap: balance; }
  .hero-ctas { margin-top: 24px; flex-direction: column; gap: 6px; }   /* the link's own 44px tap height spaces it */
  .hero-ctas .btn-lg { width: 100%; max-width: 360px; }
  .hero-ctas .soon-pill { margin-top: 8px; }   /* no download: the pill, not a 44px link, comes second */
  .facts { margin-top: 12px; }
  .hero-visual { margin-top: 30px; }
  .hero-arc path { stroke-width: 4.4; }
  .win { border-radius: var(--r-2); aspect-ratio: 444 / 672; }
  .shot-tabs { width: min(100%, 400px); margin-bottom: calc(7.2% + 12px); }   /* phones: above the arch's crown */
  .shot-tab { flex: 1 1 0; min-width: 0; gap: 8px; padding-inline: 8px; }
}
@media (max-width: 379px) {          /* the smallest phones: the names, without the icons */
  .shot-tab-icon { display: none; }
}
@media (max-width: 599px) {          /* no JS, no tab bar: keep the arch's crown clear of the line above */
  html:not(.js) .hero-visual { margin-top: 44px; }
}
@media (max-width: 599px) and (max-height: 600px) {   /* short phones (an iPhone SE in Safari): tighter, with a one-line tab bar, so the whole bar fits above the fold */
  .hero { padding-top: 16px; }
  .hero-ctas { margin-top: 14px; }
  .facts { margin-top: 8px; }
  .hero-visual { margin-top: 10px; }
  .shot-tab-dir { display: none; }
  .shot-tab { min-height: 40px; padding-block: 4px; }
  .shot-tabs { margin-bottom: calc(7.2% + 6px); }
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section { position: relative; padding-block: var(--section-y); }
.section--alt { background: var(--paper-2); }
.section-head { max-width: 800px; margin-bottom: var(--head-gap); }
.section-head .lead { margin-top: 14px; }

/* Heading on the left, content on the right (privacy, install, FAQ) */
.split {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 28px clamp(32px, 6vw, 96px); align-items: start;
}
@media (max-width: 899px) {
  .split { grid-template-columns: 1fr; }
}

/* ---- How it works: four steps in a row, grouped by tab ---- */
.steps {
  --gap: clamp(24px, 3vw, 40px);
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--gap); row-gap: 44px;
}
.group-label {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 .5em;
  margin-bottom: 22px;
  font-family: var(--font-text); font-size: var(--fs-small); font-weight: 600; letter-spacing: 0; line-height: 1.4;
  color: var(--soft);
}
.group-label .ui { font-weight: 700; }
.step-list { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--gap); }
.step { position: relative; }
.step-num {
  position: relative; z-index: 1;
  width: 32px; height: 32px; border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: .9375rem; line-height: 1;
  background: var(--btn); color: #fff;
}
.step h4 { margin-top: 18px; }
.step p { margin-top: 6px; color: var(--muted); }
.step::before {               /* the thin connector to the next step */
  content: ""; position: absolute;
  top: 15.5px; left: 44px; height: 1px;
  width: calc(100% + var(--gap) - 56px);
  background: var(--line-strong);
  transform-origin: 0 50%;
}
.step-group:last-child .step:last-child::before { display: none; }
@media (max-width: 999px) {
  .steps { grid-template-columns: 1fr; row-gap: 40px; }
  .step:last-child::before { display: none; }
}
@media (max-width: 599px) {
  .step-list { grid-template-columns: 1fr; row-gap: 26px; }
  .step { padding-left: 48px; min-height: 32px; }
  .step-num { position: absolute; left: 0; top: 0; }
  .step h4 { margin-top: 3px; }
  .step::before { top: 40px; left: 15.5px; width: 1px; height: calc(100% - 22px); transform-origin: 50% 0; }
}

/* ---- The demo video, above the steps ---- */
.demo { width: min(100%, 960px); margin: 0 auto clamp(44px, 5vw, 64px); }
.demo-frame {
  position: relative;
  border-radius: var(--r-3);
  overflow: hidden;
  isolation: isolate;
  background: var(--paper-2);
  box-shadow: 0 0 0 1px var(--frame-line), var(--frame-shadow);
}
.demo-video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; }
.demo-play {
  position: absolute; inset: 0; margin: auto;
  width: 72px; height: 72px; border-radius: 50%; border: 0;
  display: grid; place-items: center;
  background: var(--btn); color: #fff; cursor: pointer;
  box-shadow: 0 8px 24px -8px rgba(10, 27, 45, .45);
  transition: background-color .2s var(--ease), scale .2s var(--ease);
}
.demo-play:hover { background: var(--btn-hover); scale: 1.04; }
.demo-play svg { width: 30px; height: 30px; margin-left: 4px; }
@media (max-width: 599px) { .demo-play { width: 56px; height: 56px; } .demo-play svg { width: 24px; height: 24px; margin-left: 3px; } }
.demo-caption {
  margin-top: 12px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  font-size: var(--fs-small); color: var(--soft);
}
.demo-toggle {
  flex: none;
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 44px; padding: 0 16px 0 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--btn2-line); background: var(--btn2-bg); color: var(--ink);
  font: 600 var(--fs-small)/1 var(--font-text);
  cursor: pointer;
}
.demo-toggle:hover { background: var(--hover); }
.demo-toggle svg { width: 16px; height: 16px; }
.demo-toggle[data-state="playing"] .i-play, .demo-toggle:not([data-state="playing"]) .i-pause { display: none; }

/* ---- Why the best: four points, each with its comparison under a hairline ---- */
.why-grid {
  list-style: none;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px clamp(24px, 3vw, 40px);
}
.f-icon { display: block; width: 24px; height: 24px; color: var(--accent); margin-bottom: 16px; }
.why-item p { margin-top: 6px; color: var(--muted); text-wrap: balance; }   /* short blurbs: no "any block." left alone */
.why-item .vs {
  margin-top: 14px; padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-small); line-height: 1.5; color: var(--soft);
}
.why-notes { margin-top: clamp(32px, 4vw, 44px); max-width: 40rem; display: grid; gap: 8px; font-size: var(--fs-small); color: var(--soft); }
.soon-note { display: flex; align-items: baseline; gap: 10px; }
.soon-note::before {            /* the coming-soon pill's amber dot, on its own */
  content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%;
  background: var(--amber-dot); translate: 0 -1px;
}
.soon-note--live::before { background: var(--ok); }
.soon-note a { font-weight: 600; white-space: nowrap; }
@media (max-width: 999px) { .why-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 559px) {
  .why-grid { grid-template-columns: 1fr; gap: 26px; }
  .why-item { display: grid; grid-template-columns: 24px minmax(0, 1fr); column-gap: 16px; }
  .why-item > :not(.f-icon) { grid-column: 2; }
  .f-icon { grid-row: 1 / span 3; margin: 2px 0 0; }
  .why-item p { margin-top: 4px; }
  .why-item .vs { margin-top: 10px; padding-top: 9px; }
}

/* ---- Privacy ---- */
.promises { list-style: none; }
.promises li { padding: 16px 0; border-bottom: 1px solid var(--line); color: var(--muted); text-wrap: pretty; }
.promises li:first-child { padding-top: 4px; }
.promises strong { color: var(--ink); }

.disclosure summary {
  list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 56px; padding: 14px 0;
  cursor: pointer;
  font-weight: 700; color: var(--accent);
  text-wrap: balance;
}
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure-body { padding-bottom: 18px; display: grid; gap: 12px; color: var(--muted); font-size: var(--fs-small); line-height: 1.6; }
.disclosure-body p, .faq-body p { max-width: 62ch; }     /* paragraphs: about 60-70 characters a line */

/* Shared +/- marker for the disclosure and the FAQ */
.pm { flex: none; display: inline-block; vertical-align: middle; width: 24px; height: 24px; position: relative; color: var(--soft); transition: color .3s var(--ease); }
.pm::before, .pm::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: 12px; height: 1.75px; border-radius: 2px;
  background: currentColor; transform: translate(-50%, -50%);
}
.pm::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .4s var(--ease); }
details[open] > summary .pm { color: var(--accent); }
@media (max-width: 599px) { .disclosure-body { font-size: var(--fs-body); } }
@media (hover: hover) { summary:hover .pm { color: var(--accent); } }
details[open] > summary .pm::after { transform: translate(-50%, -50%) rotate(0deg); }

/* ---- Install: the heading and "Before you install" on top, then the two steps as matching cards ---- */
.install-top {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 20px clamp(32px, 6vw, 96px); align-items: start;
  margin-bottom: var(--head-gap);
}
.install-head .lead { margin-top: 14px; }
@media (max-width: 899px) { .install-top { grid-template-columns: 1fr; } }
.requirements { max-width: 34rem; font-size: var(--fs-small); color: var(--soft); }
.req-title { font-family: var(--font-text); font-size: var(--fs-small); font-weight: 700; letter-spacing: 0; color: var(--muted); }
.req-note { margin-top: 8px; }
.requirements ul { list-style: none; margin-top: 6px; display: grid; gap: 6px; }
.requirements li { position: relative; padding-left: 18px; line-height: 1.5; }
.requirements li::before {           /* a small check, quieter than a bullet */
  content: ""; position: absolute; left: 1px; top: .5em;
  width: 9px; height: 5px;
  border: solid var(--accent); border-width: 0 0 1.75px 1.75px;
  transform: rotate(-45deg);
}
.setup {
  list-style: none;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(20px, 2.4vw, 32px);
  align-items: stretch;
}
.setup > [hidden] { display: none; }
.setup:not(:has(> .install-card--ext:not([hidden]))) { grid-template-columns: minmax(0, 720px); }   /* no Step 2 yet: one card */
@media (max-width: 899px) { .setup { grid-template-columns: 1fr; } }
.setup-title { font-size: var(--fs-h3); line-height: 1.3; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; }
.setup-n {
  flex-basis: 100%;
  font-family: var(--font-text); font-size: .8125rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent);
}
.setup-n[hidden] { display: none; }
.rec-pill {
  display: inline-flex; align-items: center;
  font-family: var(--font-text); font-size: .8125rem; font-weight: 700; letter-spacing: 0; line-height: 1.3;
  padding: 4px 10px; border-radius: var(--r-pill);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
}
.setup-benefit { margin-top: -6px; color: var(--muted); }
.ext-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }
.install-card .trouble { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line); }
.install-card {
  display: flex; flex-direction: column; gap: 20px;
  padding: clamp(24px, 3vw, 36px);
  border-radius: var(--r-card);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  box-shadow: var(--frame-shadow);
}
.install-card .body { color: var(--muted); }
.install-card .state { display: grid; gap: 14px; justify-items: start; align-content: start; }
.install-card .state .code-box { justify-self: stretch; }
.state-label { font-family: var(--font-text); font-size: var(--fs-body); letter-spacing: 0; }
.install-steps { list-style: none; counter-reset: istep; display: grid; gap: 14px; }
.install-steps li { counter-increment: istep; position: relative; padding-left: 42px; line-height: 1.55; min-height: 28px; text-wrap: pretty; }
.install-steps li::before {
  content: counter(istep); position: absolute; left: 0; top: -1px;
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: .875rem; font-weight: 700;
  color: #fff; background: var(--btn);
  transition: background-color .4s var(--ease), scale .5s cubic-bezier(.3, 1.5, .5, 1);
}
.install-steps--dl li:first-child { display: grid; gap: 12px; justify-items: start; }
.dl-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; }
.dl-file { font-size: var(--fs-small); color: var(--soft); }
/* After a Download click: step 1 ticks off (script.js adds .dl-started) */
.install-card.dl-started .install-steps--dl li:first-child::before {
  content: "";
  background: var(--ok-btn) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.2 10.4l3.2 3.2 6.4-7.2' fill='none' stroke='%23fff' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px no-repeat;
  animation: ub-tick .5s cubic-bezier(.3, 1.6, .5, 1);
}
.dl-status { font-size: var(--fs-small); font-weight: 600; color: var(--ok); }
.dl-status:empty { position: absolute; }   /* a live region that takes no space until it speaks */
.dl-status--phone { color: var(--ink); }    /* on a phone: a pointer to a computer, not a success */
.soon-line { margin-top: 20px; max-width: 40rem; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; font-size: var(--fs-small); color: var(--soft); }
.code-box {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 12px 12px 12px 20px;
  border-radius: var(--r-3);
  background: var(--paper-2);
  border: 1px dashed var(--line-strong);
}
.code-box code {
  font-family: var(--font-mono); font-size: clamp(1.625rem, 1.2rem + 1.4vw, 2.125rem); font-weight: 600; letter-spacing: .07em;
  color: var(--ink); margin-right: auto; white-space: nowrap;
  -webkit-user-select: all; user-select: all;
}
.code-box .copy-btn { min-height: 48px; padding-inline: 22px; font-size: var(--fs-body); }
.copy-btn[data-copied] { background: var(--ok-btn); }
.copy-btn .ok-icon { display: none; }
.copy-btn[data-copied] .ok-icon { display: block; }
.copy-btn[data-copied] .copy-icon { display: none; }
.copy-status { font-size: var(--fs-small); color: var(--muted); }
.copy-status:empty { position: absolute; }   /* stays in the a11y tree as a live region, takes no space until it speaks */
.card-links { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; }
.card-links a { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }
.card-links svg { width: 16px; height: 16px; }
.small-note { font-size: var(--fs-small); color: var(--soft); }
.small-note b { color: var(--muted); }

@media (max-width: 459px) {
  .code-box { padding: 14px; }
  .code-box .copy-btn { width: 100%; }
  .install-card .soon-pill { font-size: .8125rem; padding-inline: 10px 11px; }
  .install-steps li { padding-left: 40px; }
}

/* ---- FAQ ---- */
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:first-child { border-top: 1px solid var(--line); }
.faq-list summary {
  list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  min-height: 58px;
  padding: 14px 0;
  cursor: pointer;
  font-weight: 700; line-height: 1.4;
  text-wrap: balance;              /* phones: no one-word second line ("supported?") */
  transition: color .25s var(--ease);
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary:active { color: var(--accent); }
@media (hover: hover) { .faq-list summary:hover { color: var(--accent); } }
.faq-body { padding: 0 48px 22px 0; color: var(--muted); }
@media (max-width: 899px) { .faq-body { padding-right: 0; } }

/* ---- Creator: one quiet note ---- */
.creator { padding-block: clamp(40px, 4.4vw, 56px); }
.creator-inner { display: flex; align-items: flex-start; gap: 20px; }
.creator-text { max-width: 40rem; }
.avatar {
  width: 48px; height: 48px; border-radius: 50%;
  display: grid; place-items: center; flex: none;
  background: var(--btn); color: #fff;
  font-family: var(--font-display); font-weight: 700; font-size: 1.0625rem; letter-spacing: -0.02em;
}
.creator-title { font-size: var(--fs-h3); line-height: 1.3; letter-spacing: -0.015em; }
.creator .note { margin-top: 8px; color: var(--muted); }
.creator .note .line { display: block; }
.creator .faith { margin-top: 6px; color: var(--muted); }
.creator .support { margin-top: 12px; font-size: var(--fs-small); }
@media (max-width: 559px) {          /* phones: the avatar sits beside the heading; the note gets the full width */
  .creator-inner { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 0 14px; }
  .creator-text { display: contents; }
  .creator-text > :not(.creator-title) { grid-column: 1 / -1; }
  .creator .note { margin-top: 14px; }
  .avatar { width: 40px; height: 40px; font-size: .9375rem; }
}

/* ==========================================================================
   survey.html: how UBridge was compared (a plain table, stacked on phones)
   ========================================================================== */
.survey { padding-block: clamp(36px, 4.6vw, 64px) var(--section-y); }
.survey-inner { max-width: 860px; }
.back-link { font-size: var(--fs-small); min-height: 44px; }
.back-link .arrow { rotate: 180deg; }
@media (hover: hover) { .back-link:hover .arrow { transform: translateX(-3px); } }
.survey h1 { margin-top: 12px; font-size: var(--fs-h2); }
.survey .lead { margin-top: 18px; max-width: 40em; text-wrap: pretty; }
.survey-counts {
  list-style: none;
  display: flex; flex-wrap: wrap; gap: 14px 40px;
  margin-top: 32px; padding-block: 20px;
  border-block: 1px solid var(--line);
}
.survey-counts li { display: flex; align-items: baseline; gap: 10px; font-weight: 600; color: var(--muted); }
.survey-counts b { font-family: var(--font-display); font-size: 2rem; line-height: 1; letter-spacing: -0.03em; color: var(--ink); }
.survey-counts .is-both b, .survey-counts .is-both span { color: var(--accent); }
.survey-key { margin-top: 16px; font-size: var(--fs-small); color: var(--soft); }
.survey-key b { color: var(--muted); }
.survey-wrap { margin-top: 36px; }
.survey-table { width: 100%; border-collapse: collapse; font-size: var(--fs-small); line-height: 1.5; }
.survey-table th, .survey-table td { text-align: left; vertical-align: top; padding: 13px 20px 13px 0; border-bottom: 1px solid var(--line); }
.survey-table th:last-child, .survey-table td:last-child { padding-right: 0; }
.survey-table thead th {
  padding-block: 0 10px;
  font-size: .8125rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--soft); border-bottom-color: var(--line-strong); white-space: nowrap;
}
.survey-table tbody th { font-weight: 600; text-wrap: pretty; }
.survey-table td { color: var(--muted); white-space: nowrap; }
.survey-table .dir-both .dir { color: var(--ink); font-weight: 700; }
.survey-table .ch-yes { color: var(--ink); font-weight: 600; }
.survey-table .ch-na { color: var(--soft); }
.survey-table .ub-body th, .survey-table .ub-body td { border-top: 2px solid var(--line-strong); border-bottom: 0; padding-top: 18px; color: var(--ink); font-weight: 700; }
.ub-this { font-weight: 500; color: var(--soft); }
.survey-notes { margin-top: 36px; max-width: 44rem; display: grid; gap: 12px; font-size: var(--fs-small); color: var(--soft); }
.survey-notes b { color: var(--muted); }
@media (max-width: 599px) {          /* phones: each add-on is a small card: the name, then direction and extension */
  .survey-counts { display: grid; grid-template-columns: repeat(3, auto); justify-content: space-between; gap: 12px; }
  .survey-counts li { flex-direction: column; gap: 6px; font-size: var(--fs-small); line-height: 1.3; }
  .survey-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .survey-table, .survey-table tbody { display: block; }
  .survey-table tr { display: flex; flex-wrap: wrap; gap: 4px 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
  .survey-table th, .survey-table td { display: block; padding: 0; border: 0; }
  .survey-table tbody th { flex-basis: 100%; font-size: var(--fs-body); }
  .survey-table td::before { content: attr(data-label) ": "; color: var(--soft); font-weight: 500; }
  .survey-table .ch-na { display: none; }   /* not stated: nothing to show */
  .survey-table .ub-body tr { border-top: 2px solid var(--line-strong); border-bottom: 0; }
  .survey-table .ub-body th, .survey-table .ub-body td { border: 0; padding-top: 0; }
  .survey-notes { gap: 16px; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding-block: 28px calc(32px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  font-size: var(--fs-small);
  color: var(--soft);
}
.footer-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 32px; }
.site-footer .wordmark { margin-right: 0; }
.footer-links { list-style: none; display: flex; flex-wrap: wrap; gap: 0 22px; }
.footer-links a { display: inline-block; padding-block: 6px; color: var(--muted); text-decoration: none; font-weight: 600; }
.footer-links a:active { color: var(--accent); }
@media (hover: hover) { .footer-links a:hover { color: var(--accent); } }
.footer-legal { margin-top: 16px; display: grid; gap: 4px; }
.footer-legal .disclaimer { color: var(--muted); }
.footer-legal .small { display: flex; flex-wrap: wrap; gap: 2px 16px; }
@media (max-width: 599px) {          /* phones: roomier tap targets in the link list */
  .footer-links { gap: 0 20px; }
  .footer-links a { padding-block: 10px; }
  .footer-legal { margin-top: 12px; }
}

/* ==========================================================================
   Phones: more air. Bigger gaps between sections, between list items and
   under headings, and a touch more line height, so no run of lines packs
   together. Same text sizes. Desktop is untouched.
   ========================================================================== */
@media (max-width: 599px) {
  :root { --section-y: 68px; --head-gap: 36px; }
  body { line-height: 1.65; }
  .section-head .lead, .install-head .lead { margin-top: 16px; }
  .split { row-gap: 32px; }

  /* How it works */
  .steps { row-gap: 52px; }
  .group-label { margin-bottom: 26px; }
  .step-list { row-gap: 36px; }
  .step p { margin-top: 8px; }
  .step::before { height: calc(100% - 12px); }  /* the connector still stops 8px short of the next number */

  /* Why */
  .why-grid { gap: 40px; }
  .why-item p { margin-top: 8px; }
  .why-item .vs { margin-top: 14px; padding-top: 12px; }
  .why-notes { margin-top: 44px; gap: 16px; }

  /* Privacy */
  .promises li { padding: 20px 0; }
  .promises li:first-child { padding-top: 0; }
  .disclosure summary { padding-block: 18px; }
  .disclosure-body { gap: 16px; padding-bottom: 24px; }

  /* Install: the cards a little tighter inside, so Step 2 is near */
  .requirements ul { margin-top: 10px; gap: 12px; }
  .install-card { gap: 16px; padding: 22px 20px; }
  .install-steps { gap: 14px; }
  .install-steps--dl li:first-child { gap: 14px; }
  .install .soon-line { gap: 10px 12px; }

  /* FAQ */
  .faq-list summary { min-height: 64px; padding-block: 18px; }
  .faq-body { padding-bottom: 26px; }

  /* Creator and footer */
  .creator { padding-block: 56px; }
  .creator .note { margin-top: 18px; }
  .creator .faith { margin-top: 10px; }
  .creator .support { margin-top: 16px; }
  .site-footer { padding-top: 36px; }
  .footer-legal { margin-top: 18px; gap: 8px; }
}

/* ==========================================================================
   Motion: one system, quiet and quick.
   - Transform, opacity (and a brief blur on the headline) only; nothing loops.
   - The hero plays once on load (CSS only), from near-visible states, in ~2s:
     the headline word by word, then the copy, the window, and the thin arch drawing over it.
   - Below the fold, items (.r) fade up as they scroll in, a beat apart. That is
     progressive enhancement: only with JS and IntersectionObserver
     (html.reveal-on), only after the visitor first scrolls, and only for items
     still below the viewport. A failsafe in script.js shows anything left hidden.
   - prefers-reduced-motion: everything is simply there, nothing moves.
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  /* ---- Hero, on load ---- */
  .hero h1 .w { animation: ub-word .85s var(--ease) backwards; animation-delay: calc(.05s + var(--w, 0) * 60ms); }
  .swoosh path { animation: ub-draw .7s cubic-bezier(.6, .05, .25, 1) .6s backwards; }
  .hero-lead  { animation: ub-rise .7s var(--ease) .4s backwards; }
  .hero-ctas  { animation: ub-rise .7s var(--ease) .48s backwards; }
  .facts      { animation: ub-rise .7s var(--ease) .56s backwards; }

  .shot-tabs  { animation: ub-rise .7s var(--ease) .56s backwards; }
  .win { animation: ub-win .95s var(--ease) .5s backwards; }
  .hero-arc path { animation: ub-draw 1.1s cubic-bezier(.45, 0, .2, 1) .85s backwards; }
  .hero-caption { animation: ub-fade .6s ease 1.1s backwards; }

  /* ---- Scroll reveals (script.js adds .reveal-on to <html>, .is-pending to items) ---- */
  .reveal-on .r {
    transition:
      opacity .7s var(--ease) var(--d, 0s),
      translate .8s var(--ease) var(--d, 0s),
      scale .8s var(--ease) var(--d, 0s);
  }
  .reveal-on .r.is-pending { opacity: 0; translate: 0 26px; transition: none; }   /* hide at once; animate only the way in */
  .reveal-on .r--lift.is-pending { translate: 0 36px; scale: .97; } /* the install card */

  /* how it works: each number pops after its step arrives, then the line to the next one draws */
  .reveal-on .step .step-num { transition: scale .55s cubic-bezier(.3, 1.5, .5, 1) calc(var(--d, 0s) + .12s), opacity .3s ease calc(var(--d, 0s) + .12s); }
  .reveal-on .step.is-pending .step-num { scale: .3; opacity: 0; transition: none; }
  .reveal-on .step::before { transition: scale .6s var(--ease) calc(var(--d, 0s) + .3s); }
  .reveal-on .step.is-pending::before { scale: 0 1; transition: none; }

  /* FAQ and the extension disclosure: the answer fades in under a smooth height change */
  details[open] > .faq-body, details[open] > .disclosure-body { animation: ub-open .5s var(--ease); }
}
@media (prefers-reduced-motion: no-preference) and (max-width: 599px) {
  .reveal-on .step.is-pending::before { scale: 1 0; }
}
/* Phones and tablets: the headline's words rise without the blur (cheaper to draw). A variable, not a
   different animation-name, so crossing the breakpoint (resizing, rotating) never replays the headline. */
@media (max-width: 599px), (hover: none) {
  .hero h1 .w { --word-filter: none; }
}
@supports (interpolate-size: allow-keywords) and selector(::details-content) {
  @media (prefers-reduced-motion: no-preference) {
    .faq-list details, .disclosure { interpolate-size: allow-keywords; }
    .faq-list details::details-content, .disclosure::details-content {
      block-size: 0; overflow-y: clip;
      transition: block-size .5s var(--ease), content-visibility .5s allow-discrete;
    }
    .faq-list details[open]::details-content, .disclosure[open]::details-content { block-size: auto; }
  }
}

/* The page cross-fades when the theme changes (script.js, where View Transitions exist) */
::view-transition-old(root), ::view-transition-new(root) { animation-duration: .45s; animation-timing-function: var(--ease); }

@keyframes ub-word { from { opacity: .35; translate: 0 .18em; filter: var(--word-filter, blur(4px)); } }
@keyframes ub-rise { from { opacity: .45; translate: 0 10px; } }
@keyframes ub-fade { from { opacity: 0; } }
@keyframes ub-win  { from { opacity: .3; translate: 0 36px; scale: .96; } }
@keyframes ub-draw { from { stroke-dasharray: 1 1; stroke-dashoffset: 1; } to { stroke-dasharray: 1 1; stroke-dashoffset: 0; } }
@keyframes ub-tick { 0% { scale: .4; } 70% { scale: 1.12; } 100% { scale: 1; } }
@keyframes ub-open { from { opacity: 0; translate: 0 -6px; } }
@keyframes ub-menu { from { opacity: 0; translate: 0 -8px; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; transition-delay: 0s !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}
@media print {
  .reveal-on .r.is-pending, .reveal-on .step.is-pending .step-num {
    opacity: 1 !important; translate: none !important; scale: none !important;
  }
  .reveal-on .step.is-pending::before { scale: none !important; }
  .site-header { position: static; }
  .hero-shot { transform: none !important; }
}