/* Sparo AI · neutral graphite world; the videos carry the colour.
   Layout: a narrow reading column with one wide "screen" moment per page. */
:root {
  --ink: #0b0c0e;        /* page */
  --panel: #131418;      /* raised surfaces */
  --line: #24262c;       /* hairlines */
  --fg: #ececee;         /* text */
  --mute: #9a9ca4;       /* secondary text */
  --hi: #ffffff;         /* emphasis / buttons */
  --ok: #7fe3b0;         /* success state only */
  --err: #ff8f86;        /* error state only */
  --display: "Geist", "Helvetica Neue", Arial, sans-serif;
  --body: "Geist", "Helvetica Neue", Arial, sans-serif;
  --mono: "Geist Mono", ui-monospace, Menlo, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ink); color: var(--fg); font: 400 17px/1.6 var(--body);
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
img, video { max-width: 100%; display: block; }
a { color: var(--hi); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--hi); outline-offset: 3px; }
.wrap { max-width: 1080px; margin: 0 auto; }
.col { max-width: 680px; }

/* top bar */
.top { display: flex; align-items: center; gap: 12px; padding-block: 22px; }
.top img { width: 36px; height: 36px; border-radius: 50%; }
.top b { font: 600 16px/1 var(--display); letter-spacing: -.01em; }
.top span { margin-left: auto; font: 500 13px/1 var(--mono); color: var(--mute); }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 56px; align-items: center; padding-block: 36px 64px; }
.eyebrow { font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--mute); }
h1 { font: 700 clamp(38px, 6vw, 64px)/1.02 var(--display); letter-spacing: -.035em; margin: 18px 0 20px; text-wrap: balance; }
h2 { font: 700 clamp(28px, 3.6vw, 38px)/1.1 var(--display); letter-spacing: -.03em; margin: 0 0 16px; text-wrap: balance; }
h3 { font: 650 20px/1.25 var(--display); letter-spacing: -.015em; margin: 0 0 8px; }
.lede { font-size: 19px; color: var(--mute); margin: 0 0 28px; max-width: 34em; }
.lede b { color: var(--fg); font-weight: 600; }

/* the phone screen */
.screen { position: relative; aspect-ratio: 9 / 16; width: 100%; max-width: 340px; border-radius: 30px; overflow: hidden; background: #000;
  box-shadow: 0 0 0 1px var(--line), 0 40px 90px rgba(0,0,0,.6); justify-self: end; }
.screen video { width: 100%; height: 100%; object-fit: cover; }
.sound { position: absolute; right: 12px; bottom: 12px; border: 0; border-radius: 20px; padding: 8px 14px; background: rgba(0,0,0,.6); color: #fff;
  font: 600 13px/1 var(--body); cursor: pointer; backdrop-filter: blur(6px); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 54px; padding: 0 26px; border: 0; border-radius: 27px;
  background: var(--hi); color: var(--ink); font: 650 16px/1 var(--body); text-decoration: none; cursor: pointer; }
.btn:hover { filter: brightness(.9); }
.btn[disabled] { opacity: .5; cursor: progress; }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats div { padding: 22px 18px; border-left: 1px solid var(--line); }
.stats div:first-child { border-left: 0; padding-left: 0; }
.stats b { display: block; font: 700 34px/1 var(--display); letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stats span { display: block; margin-top: 8px; font: 500 13px/1.3 var(--mono); color: var(--mute); }

section { padding-block: 72px; }
.beats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 32px; }
.beat img { border-radius: 16px; aspect-ratio: 9 / 16; object-fit: cover; width: 100%; box-shadow: 0 0 0 1px var(--line); }
.beat .tc { display: block; margin: 14px 0 6px; font: 500 12px/1 var(--mono); color: var(--mute); font-variant-numeric: tabular-nums; }
.beat p { margin: 0; color: var(--mute); font-size: 15px; }
.beat p b { color: var(--fg); font-weight: 600; }

.inside { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 40px; padding: 0; margin: 28px 0 0; list-style: none; }
.inside li { display: grid; grid-template-columns: 44px minmax(0, 1fr); padding: 16px 0; border-top: 1px solid var(--line); }
.inside li span { font: 500 13px/1.6 var(--mono); color: var(--mute); }
.inside li b { font-weight: 600; } .inside li em { display: block; font-style: normal; color: var(--mute); font-size: 15px; }

/* gate form */
.gate { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; padding: 44px; border-radius: 28px; background: var(--panel); box-shadow: inset 0 0 0 1px var(--line); }
.gate p { color: var(--mute); margin: 0; }
form { display: grid; gap: 14px; align-content: start; }
label.f { font: 500 13px/1 var(--mono); color: var(--mute); }
input[type=email] { width: 100%; height: 56px; padding: 0 18px; border-radius: 16px; border: 1px solid var(--line); background: var(--ink); color: var(--fg); font: 400 17px var(--body); }
.check { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 12px; font-size: 14px; color: var(--mute); line-height: 1.5; cursor: pointer; }
.check input { width: 20px; height: 20px; margin: 1px 0 0; accent-color: #fff; }
.msg { min-height: 22px; font-size: 14px; margin: 0; }
.msg.err { color: var(--err); } .msg.ok { color: var(--ok); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.fine { font-size: 13px; color: var(--mute); }

footer { padding-block: 40px 60px; border-top: 1px solid var(--line); font-size: 13px; color: var(--mute); display: flex; flex-wrap: wrap; gap: 8px 24px; }

/* guide page */
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 0; padding: 0; list-style: none; }
.toc a { display: inline-block; padding: 8px 14px; border-radius: 18px; box-shadow: inset 0 0 0 1px var(--line); text-decoration: none; font-size: 14px; color: var(--fg); }
.step { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 40px; padding-block: 48px; border-top: 1px solid var(--line); }
.step .n { font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--mute); }
.step h2 { margin-top: 12px; }
.step ul, .step ol { padding-left: 20px; margin: 12px 0 0; } .step li { margin: 8px 0; }
.step p { margin: 12px 0 0; }
.step img { border-radius: 16px; box-shadow: 0 0 0 1px var(--line); }
code { font: 500 .88em var(--mono); background: var(--panel); padding: 2px 6px; border-radius: 6px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; } td, th { text-align: left; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 500 12px var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .1em; }
.tablewrap { overflow-x: auto; margin-top: 16px; }
.cta { padding: 40px; border-radius: 28px; background: var(--hi); color: var(--ink); }
.cta h2 { color: var(--ink); } .cta p { margin: 0; color: #3a3c42; } .cta b { color: var(--ink); }
.kw { font: 700 .95em var(--mono); background: var(--ink); color: var(--hi); padding: 3px 10px; border-radius: 8px; }

@media (max-width: 820px) {
  .hero, .gate, .step { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .screen { justify-self: center; }
  .step img { max-width: 240px; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats div:nth-child(3) { border-left: 0; padding-left: 0; }
  .stats div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .beats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .inside { grid-template-columns: minmax(0, 1fr); }
  .gate, .cta { padding: 28px 22px; }
  section { padding-block: 52px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

/* guide tip + owner library */
.tip { margin: 0 0 22px; padding: 16px 18px; border-radius: 16px; background: var(--panel); box-shadow: inset 0 0 0 1px var(--line); color: var(--mute); font-size: 15px; max-width: 36em; }
.tip b { color: var(--fg); }
.lock { max-width: 420px; margin-top: 24px; }
.input, .lock input { width: 100%; height: 56px; padding: 0 18px; border-radius: 16px; border: 1px solid var(--line); background: var(--ink); color: var(--fg); font: 400 17px var(--body); }
.acts { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.btn.sm { height: 42px; padding: 0 18px; font-size: 14px; }
.btn.ghost { background: transparent; color: var(--fg); box-shadow: inset 0 0 0 1px var(--line); }
.pill { display: inline-flex; align-items: center; gap: 6px; height: 42px; padding: 0 16px; border-radius: 21px; background: var(--panel); font-size: 14px; color: var(--mute); }
.pill b { color: var(--fg); }
.libgrid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; padding-bottom: 40px; }
.lib { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 20px; padding: 18px; border-radius: 24px; background: var(--panel); box-shadow: inset 0 0 0 1px var(--line); }
.lib img { width: 120px; aspect-ratio: 9 / 16; object-fit: cover; border-radius: 14px; }
.lib .lb { display: grid; gap: 8px; align-content: start; min-width: 0; }
.lib h3 { margin: 0; }
.lib .fine { margin: 0; } .lib .fine b { color: var(--fg); }
.lib .u { display: block; overflow-x: auto; white-space: nowrap; font-size: 13px; }
@media (max-width: 820px) { .libgrid { grid-template-columns: minmax(0, 1fr); } .lib { grid-template-columns: 88px minmax(0, 1fr); } .lib img { width: 88px; } }