/* =========================================================================
   Vitals — landing page
   "Instrument (Soft Daylight)" identity. Cool silver-white, bold Geist,
   one electric-blue accent, hairlines + whitespace. No build step.
   ========================================================================= */

:root {
  --base:           #F6F8FA;
  --surface:        #FFFFFF;
  --surface-2:      #EEF2F7;
  --surface-inset:  #F0F4F8;

  --hairline:        rgba(31, 52, 84, 0.10);
  --hairline-strong: rgba(31, 52, 84, 0.17);

  --ink:      #0E1726;
  --ink-dim:  #3A4658;
  --ink-mute: #7A879B;

  --accent:      #2563EB;
  --accent-2:    #60A5FA;
  --accent-deep: #1D4ED8;
  --accent-soft: rgba(37, 99, 235, 0.10);
  --accent-wash: rgba(37, 99, 235, 0.055);

  --warn:  #B45309;
  --good:  #0EA5A0;

  --brand-from: #3B82F6;
  --brand-to:   #1D4ED8;
  --brand-grad: linear-gradient(135deg, var(--accent), var(--accent-deep));

  --radius-sm:   12px;
  --radius-md:   16px;
  --radius-lg:   22px;
  --radius-xl:   26px;
  --radius-pill: 999px;

  --shadow-card:       0 1px 2px rgba(30, 50, 80, 0.04), 0 12px 30px -16px rgba(30, 50, 80, 0.18);
  --shadow-card-hover: 0 2px 6px rgba(30, 50, 80, 0.06), 0 22px 48px -20px rgba(30, 50, 80, 0.26);
  --shadow-soft:       0 2px 4px rgba(30, 50, 80, 0.05), 0 40px 80px -34px rgba(30, 50, 80, 0.34);
  --glow-accent:       0 10px 26px -8px rgba(37, 99, 235, 0.55);

  --wrap: 1140px;
  --gutter: 24px;

  --font: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  font-weight: 400;
  color: var(--ink);
  background: var(--base);
  line-height: 1.6;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--ink);
}
h2 { font-size: clamp(1.75rem, 1.1rem + 2.6vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 1rem + 0.9vw, 1.5rem); letter-spacing: -0.03em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }

code {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.9em;
  background: var(--surface-2);
  padding: 0.1em 0.45em;
  border-radius: 7px;
  color: var(--ink);
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 8px; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }

.skip-link {
  position: absolute; left: 16px; top: -64px; z-index: 100;
  background: var(--surface); color: var(--ink);
  padding: 10px 16px; border-radius: var(--radius-pill);
  box-shadow: var(--shadow-card); font-weight: 600; transition: top 0.18s ease;
}
.skip-link:focus { top: 16px; }

/* ----- Shared bits ----- */
.eyebrow {
  margin: 0 0 0.7rem;
  font-family: var(--mono);
  font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-mute);
}
.eyebrow--brand { color: var(--accent); }
.text-accent { color: var(--accent); }
.text-gradient-brand {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: var(--font); font-weight: 600; font-size: 1rem;
  padding: 0.85rem 1.55rem; border-radius: var(--radius-pill);
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.16,1,0.3,1), box-shadow 0.2s ease, filter 0.2s ease;
}
.btn--primary { background: var(--brand-grad); color: #fff; box-shadow: var(--glow-accent); }
.btn--primary:hover { transform: translateY(-1px); filter: brightness(1.04); box-shadow: 0 14px 32px -8px rgba(37,99,235,0.6); }
.btn--soft { background: var(--surface); color: var(--ink); box-shadow: inset 0 0 0 1px var(--hairline-strong), var(--shadow-card); }
.btn--soft:hover { transform: translateY(-1px); box-shadow: inset 0 0 0 1px var(--accent-soft), var(--shadow-card-hover); }
@media (prefers-reduced-motion: reduce) { .btn, .btn:hover { transition: none; transform: none; } }

/* ----- Nav ----- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246, 248, 250, 0.78);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--hairline);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; }
.brand__mark { border-radius: 9px; }
.brand__name { font-weight: 600; font-size: 1.18rem; letter-spacing: -0.03em; }
.nav__links { display: flex; align-items: center; gap: 0.35rem; }
.nav__links > a {
  padding: 0.5rem 0.9rem; border-radius: var(--radius-pill);
  font-weight: 500; font-size: 0.95rem; color: var(--ink-dim);
  transition: color 0.15s ease, background 0.15s ease;
}
.nav__links > a:hover { color: var(--ink); background: var(--surface-2); }
.nav__cta { background: var(--brand-grad); color: #fff !important; box-shadow: var(--glow-accent); }
.nav__cta:hover { filter: brightness(1.05); }

/* ----- Hero (product-led) ----- */
.hero { position: relative; isolation: isolate; overflow: hidden; padding-block: clamp(56px, 9vw, 110px) clamp(40px, 6vw, 80px); }
.hero__aurora {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(1100px 640px at 88% -6%, rgba(37,99,235,0.13), transparent 60%),
    radial-gradient(820px 520px at -8% 16%, rgba(96,165,250,0.14), transparent 58%),
    radial-gradient(700px 600px at 60% 120%, rgba(34,211,238,0.08), transparent 60%),
    linear-gradient(180deg, #FAFBFD, var(--base) 50%);
}
.hero__inner { display: grid; grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr); gap: clamp(2rem, 4vw, 4rem); align-items: center; }
.hero__copy { max-width: 36rem; }
.kicker {
  display: inline-flex; align-items: center; gap: 0.55rem;
  margin: 0 0 1.3rem; padding: 0.45rem 0.95rem 0.45rem 0.8rem;
  background: rgba(255,255,255,0.7); border-radius: var(--radius-pill);
  font-size: 0.82rem; font-weight: 500; color: var(--ink-dim);
  box-shadow: inset 0 0 0 1px var(--hairline), var(--shadow-card);
}
.kicker__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 4px rgba(14,165,160,0.16); }
.hero__title { font-size: clamp(2.5rem, 1.3rem + 4.6vw, 4.1rem); line-height: 1.02; letter-spacing: -0.045em; }
.hero__sub { margin-top: 1.3rem; max-width: 30rem; font-size: clamp(1.05rem, 1rem + 0.4vw, 1.2rem); color: var(--ink-dim); }
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 1.9rem; }
.hero__shot { margin: 0; }
.hero__shot .shot__frame { transform: perspective(1600px) rotateY(-3deg); transition: transform 0.5s cubic-bezier(0.16,1,0.3,1); }
.hero__shot .shot__frame:hover { transform: perspective(1600px) rotateY(0deg) translateY(-3px); }

/* ----- Source chips ----- */
.sources { padding-block: clamp(36px, 5vw, 56px); text-align: center; border-top: 1px solid var(--hairline); }
.sources__label { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-mute); margin-bottom: 1.4rem; }
.chips { list-style: none; margin: 0 0 1.2rem; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 0.7rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 1.1rem; background: var(--surface); border-radius: var(--radius-pill);
  font-weight: 500; font-size: 0.95rem; color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--hairline), var(--shadow-card);
}
.chip--soft { color: var(--ink-dim); background: var(--surface-2); box-shadow: none; }
.chip__tag { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-mute); padding: 0.1rem 0.5rem; background: var(--surface); border-radius: var(--radius-pill); }
.sources__note { max-width: 44rem; margin-inline: auto; color: var(--ink-mute); font-size: 0.95rem; }

/* ----- Problem → solution ----- */
.ps { padding-block: clamp(48px, 7vw, 88px); }
.ps__grid { display: grid; gap: 1.4rem; grid-template-columns: repeat(2, 1fr); }
.ps__col { background: var(--surface); border-radius: var(--radius-xl); padding: clamp(1.6rem, 1rem + 2vw, 2.6rem); box-shadow: inset 0 0 0 1px var(--hairline), var(--shadow-card); }
.ps__col--solution { background: radial-gradient(120% 120% at 0% 0%, var(--accent-wash), transparent 60%), var(--surface); box-shadow: inset 0 0 0 1px var(--accent-soft), var(--shadow-card); }
.ps__col h2 { font-size: clamp(1.35rem, 1.1rem + 1.1vw, 1.85rem); }
.ps__body { margin-top: 0.9rem; color: var(--ink-dim); }

/* ----- Section heading ----- */
.sec-head { max-width: 44rem; margin: 0 auto clamp(2rem, 4vw, 3rem); text-align: center; }
.sec-head__title { margin-top: 0.3rem; }
.sec-head__sub { margin-top: 1rem; font-size: 1.08rem; color: var(--ink-dim); }

/* ----- Features ----- */
.features { padding-block: clamp(56px, 8vw, 104px); }
.shot__frame { border-radius: var(--radius-xl); overflow: hidden; background: var(--surface); box-shadow: inset 0 0 0 1px var(--hairline), var(--shadow-soft); }
.shot__frame img { width: 100%; height: auto; display: block; }
.shot__frame--dark { background: #0B0F17; box-shadow: inset 0 0 0 1px var(--hairline-strong), var(--shadow-soft); }
.shot figcaption { margin-top: 1rem; color: var(--ink-dim); font-size: 0.98rem; }
.shot figcaption strong { color: var(--ink); font-weight: 600; }

/* light & dark pair */
.theme-pair { margin-top: 0; }
.theme-pair__head { max-width: 42rem; margin: 0 auto 2rem; text-align: center; }
.theme-pair__head p { margin-top: 0.8rem; color: var(--ink-dim); }
.theme-pair__shots { display: grid; gap: 1.5rem; grid-template-columns: repeat(2, 1fr); }
.shot--pair figcaption { margin-top: 0.8rem; font-weight: 500; color: var(--ink-dim); text-align: center; }

/* per-surface grid (sleep / activity) */
.surfaces { margin-top: clamp(48px, 7vw, 80px); display: grid; gap: 1.5rem; grid-template-columns: repeat(2, 1fr); }

/* mobile row */
.mobile-row { margin-top: clamp(56px, 8vw, 96px); display: grid; grid-template-columns: 280px 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.mobile-row__copy p { margin-top: 0.9rem; color: var(--ink-dim); }
.phone { position: relative; width: 262px; margin-inline: auto; padding: 11px; background: #0B0F17; border-radius: 46px; box-shadow: var(--shadow-soft), inset 0 0 0 2px var(--hairline-strong); }
.phone__notch { position: absolute; top: 20px; left: 50%; transform: translateX(-50%); width: 92px; height: 24px; background: #0B0F17; border-radius: var(--radius-pill); z-index: 2; }
.phone img { width: 100%; height: auto; border-radius: 36px; display: block; }

/* ----- Ask AI / brief ----- */
.brief { position: relative; isolation: isolate; overflow: hidden; padding-block: clamp(56px, 8vw, 104px); }
.brief__aurora {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(900px 600px at 100% 0%, rgba(37,99,235,0.10), transparent 56%), radial-gradient(700px 520px at 0% 100%, rgba(96,165,250,0.10), transparent 56%);
}
.brief__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.brief__body { margin-top: 1rem; color: var(--ink-dim); font-size: 1.05rem; }
.brief__feats { list-style: none; margin: 1.6rem 0 0; padding: 0; display: grid; gap: 0.9rem; }
.brief__feats li { display: flex; gap: 0.8rem; align-items: baseline; color: var(--ink-dim); font-size: 0.98rem; }
.badge { flex: none; display: inline-flex; align-items: center; padding: 0.25rem 0.7rem; border-radius: var(--radius-pill); font-size: 0.74rem; font-weight: 600; background: var(--surface-2); color: var(--ink-dim); white-space: nowrap; }
.badge--brand { background: var(--accent-soft); color: var(--accent); }
.brief__shot { margin: 0; }

/* ----- Trio ----- */
.trio { padding-block: clamp(56px, 8vw, 104px); background: var(--surface-2); }
.trio__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.tcard { background: var(--surface); border-radius: var(--radius-xl); padding: clamp(1.6rem, 1rem + 1.5vw, 2.2rem); box-shadow: inset 0 0 0 1px var(--hairline), var(--shadow-card); transition: transform 0.25s cubic-bezier(0.16,1,0.3,1), box-shadow 0.25s ease; }
.tcard:hover { transform: translateY(-3px); box-shadow: inset 0 0 0 1px var(--accent-soft), var(--shadow-card-hover); }
.tcard__icon { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent); margin-bottom: 1.1rem; }
.tcard h3 { margin-bottom: 0.5rem; }
.tcard p { color: var(--ink-dim); font-size: 0.98rem; }
@media (prefers-reduced-motion: reduce) { .tcard, .tcard:hover { transition: none; transform: none; } }

/* ----- Self-host ----- */
.install { padding-block: clamp(56px, 8vw, 104px); }
.install__grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.steps { list-style: none; margin: 1.6rem 0 2rem; padding: 0; display: grid; gap: 1.1rem; }
.steps li { display: flex; gap: 1rem; align-items: flex-start; }
.steps__n { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 600; font-size: 0.95rem; }
.steps li div { color: var(--ink-dim); padding-top: 0.25rem; }
.steps li strong { color: var(--ink); font-weight: 600; }

/* code card */
.code { margin: 0; border-radius: var(--radius-xl); overflow: hidden; background: #0B0F17; box-shadow: var(--shadow-soft); }
.code__bar { display: flex; align-items: center; gap: 0.5rem; padding: 0.85rem 1.1rem; background: #131A26; border-bottom: 1px solid rgba(255, 255, 255, 0.06); }
.code__dot { width: 11px; height: 11px; border-radius: 50%; background: rgba(255, 255, 255, 0.16); }
.code__name { margin-left: 0.5rem; font-family: var(--mono); font-size: 0.8rem; color: #9DAABC; }
.code__copy { margin-left: auto; font-family: var(--mono); font-weight: 500; font-size: 0.78rem; color: #EAEEF3; background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: var(--radius-pill); padding: 0.3rem 0.85rem; cursor: pointer; transition: background 0.15s ease; }
.code__copy:hover { background: rgba(255, 255, 255, 0.16); }
.code__copy.is-copied { background: var(--accent); border-color: transparent; }
.code__body { margin: 0; padding: 1.3rem 1.4rem; overflow-x: auto; font-family: var(--mono); font-size: 0.86rem; line-height: 1.85; color: #EAEEF3; white-space: pre; }
.code__body code { background: none; padding: 0; color: inherit; font-weight: 400; }
.c-c { color: #6F7E93; }

/* ----- Final CTA ----- */
.finalcta { padding-block: clamp(56px, 8vw, 104px); }
.finalcta__inner {
  position: relative; overflow: hidden; text-align: center;
  border-radius: var(--radius-xl);
  padding: clamp(2.6rem, 1.5rem + 4vw, 4.5rem) clamp(1.5rem, 1rem + 3vw, 3rem);
  background: radial-gradient(130% 150% at 50% 0%, var(--accent-wash), transparent 62%), var(--surface);
  box-shadow: inset 0 0 0 1px var(--accent-soft), var(--shadow-card);
}
.finalcta__inner h2 { font-size: clamp(2rem, 1.3rem + 2.6vw, 2.9rem); }
.finalcta__inner p { margin: 1rem auto 0; max-width: 36rem; color: var(--ink-dim); font-size: 1.08rem; }
.finalcta .hero__cta { justify-content: center; margin-top: 2rem; }

/* ----- Footer ----- */
.footer { border-top: 1px solid var(--hairline); padding-block: 2.4rem; }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.2rem; }
.footer__brand { display: inline-flex; align-items: center; gap: 0.55rem; }
.footer__brand .brand__name { font-size: 1.05rem; }
.footer__links { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.footer__links a { font-weight: 500; font-size: 0.95rem; color: var(--ink-dim); }
.footer__links a:hover { color: var(--ink); }
.footer__meta { flex-basis: 100%; color: var(--ink-mute); font-size: 0.88rem; }

/* ----- Scroll reveal ----- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s cubic-bezier(0.16,1,0.3,1), transform 0.6s cubic-bezier(0.16,1,0.3,1); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 940px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__copy { max-width: none; }
  .hero__shot .shot__frame, .hero__shot .shot__frame:hover { transform: none; }
}
@media (max-width: 860px) {
  .ps__grid, .trio__grid, .theme-pair__shots, .surfaces { grid-template-columns: 1fr; }
  .brief__grid, .install__grid, .mobile-row { grid-template-columns: 1fr; }
  .mobile-row { text-align: center; }
  .mobile-row__copy { order: 2; }
  .brief__shot { order: -1; }
}
@media (max-width: 560px) {
  :root { --gutter: 18px; }
  .nav__links { gap: 0.1rem; }
  .nav__links > a { padding: 0.45rem 0.7rem; font-size: 0.9rem; }
  .btn { width: 100%; }
  .hero__cta .btn { flex: 1 1 auto; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}