/* ==========================================================================
   ISR DroneRunner — landing page
   One page, one stylesheet, no build step. A sibling of
   scudrunner/assets/css/scudrunner.css, which stays the canonical source of
   the shared design tokens: the token block below carries the same names and
   values, and a token change is made there first and ported here. The two
   roots are separate files with separate deploys.

   What is DroneRunner's own is the teal --product accent, taken from the app
   (it marks what the pilot set), the hero that leads with the product name,
   and the screenshot geometry.

   Written mobile-first, widening at 680px and 1024px.

   Sections: Fonts → Design tokens → Reset → Type → Components → Layout.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Fonts — self-hosted, latin subset, from Google Fonts:
   https://fonts.googleapis.com/css2?family=Barlow:wght@500;600;700&family=IBM+Plex+Mono:wght@500;600
   The page makes zero external requests, which is a hard invariant of this
   repo; re-download from those URLs if a weight is ever added.
   -------------------------------------------------------------------------- */

@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/barlow-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/barlow-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/barlow-700-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/ibm-plex-mono-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/ibm-plex-mono-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

/* --------------------------------------------------------------------------
   Design tokens — shared with scudrunner.css; --product-* are local
   -------------------------------------------------------------------------- */

:root {
  --accent: #006cfc;
  --accent-dark: #0052c4;
  --ink: #0a0c14;
  --ink-soft: #3c4457;
  --grey: #78839b;
  --rim: #e4e7ee;
  --rim-soft: #edf0f5;
  --surface: #ffffff;
  --dark: #0a1324;
  --dark-rim: #22304a;
  --dark-ink: #9aa8c0;
  --dark-grey: #6e7f9e;
  --vfr: #1e913c;
  --error: #b3261e;

  /* The app's own accent, sampled from its primary button. 8.3:1 on white. */
  --product: #09585f;
  --product-dark: #064248;

  --font-display: 'Barlow', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-body: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI',
    system-ui, sans-serif;

  --wrap: 1200px;
  --gutter: 20px;
  --radius-card: 18px;
  --radius-control: 13px;

  /* Displayed screenshot widths. The masters are 1242x2503, and these are the
     widths build_dronerunner_web_images.py encodes against — change both
     together, along with the sizes attributes in index.html. */
  --shot-hero: 262px;
  --shot-feature: 277px;
}

/* --------------------------------------------------------------------------
   Reset
   -------------------------------------------------------------------------- */

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

html {
  background: #e7ecf3;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #f5f6f9 0%, #edf0f5 46%, #e7ecf3 100%);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--product);
  text-decoration: none;
}

a:hover {
  color: var(--product-dark);
}

:focus-visible {
  outline: 2px solid var(--product);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10;
  padding: 12px 18px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Type
   -------------------------------------------------------------------------- */

.mono {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey);
  margin: 0;
}

.mono--plain {
  text-transform: none;
  letter-spacing: 0.06em;
}

.mono--accent {
  color: var(--product);
}

.h1,
.h2,
.h3 {
  font-family: var(--font-display);
  margin: 0;
  text-wrap: balance;
}

.h1 {
  font-weight: 700;
  /* 44px at 375, 78px at 1440 */
  font-size: clamp(2.75rem, 2rem + 3.19vw, 4.875rem);
  line-height: 1.02;
  letter-spacing: -0.021em;
}

.h2 {
  font-weight: 700;
  /* 30px at 375, 42px at 1440 */
  font-size: clamp(1.875rem, 1.61rem + 1.13vw, 2.625rem);
  line-height: 1.09;
  letter-spacing: -0.017em;
}

.h3 {
  font-weight: 600;
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.lede {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0;
  text-wrap: pretty;
}

.body-text {
  font-size: 16px;
  line-height: 1.68;
  color: var(--ink-soft);
  margin: 0;
  text-wrap: pretty;
}

.body-text strong {
  color: var(--ink);
  font-weight: 600;
}

.small {
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
  margin: 0;
}


/* --------------------------------------------------------------------------
   Components
   -------------------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.card {
  background: var(--surface);
  border: 1px solid var(--rim);
  border-radius: var(--radius-card);
  box-shadow: 0 1px 2px rgba(10, 19, 36, 0.04),
    0 14px 32px -18px rgba(10, 19, 36, 0.18);
}

.rule {
  height: 1px;
  background: var(--rim);
  border: 0;
  margin: 0;
}

.btn,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}

.btn {
  background: var(--product);
  color: #ffffff;
  box-shadow: 0 8px 20px -8px rgba(9, 88, 95, 0.5);
}

.btn:hover {
  color: #ffffff;
  filter: brightness(1.06);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--rim);
  color: var(--ink);
}

.btn-ghost:hover {
  color: var(--ink);
  background: #ffffff;
}

/* A screenshot plus the mono breadcrumb naming where in the app it lives. */
.shot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

/* The shadow is cast by a box behind the image, not by the image: iOS Safari
   paints filter: drop-shadow() on an alpha image as a flat gray block, and a
   box-shadow on the <img> is clipped to a border box that is wider than the
   phone. scudrunner.css has the full account. The inset and radius are this
   frame's body measured off the 1242x2503 masters - the canvas is trimmed to
   the frame, so only the side buttons stand outside the body, by 0.56% of the
   width. */
.shot picture {
  position: relative;
  isolation: isolate;
}

.shot picture::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 0.56%;
  border-radius: 11.5% / 5.7%;
  box-shadow: 0 22px 38px rgba(10, 19, 36, 0.22);
}

.shot--hero img {
  width: var(--shot-hero);
}

.shot--feature img {
  width: var(--shot-feature);
}


/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.wordmark:hover {
  color: var(--ink);
}

.wordmark sup {
  font-size: 9px;
  font-weight: 600;
  vertical-align: super;
  line-height: 0;
}

.masthead__nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

/* One page of anchors does not earn a drawer: below 900px the section links
   drop out — the footer lists every one of them — and only the beta
   button stays. Nothing to trap focus in, and no JS. */
.masthead__links {
  display: none;
  align-items: center;
  /* Eight links: 30px, as on the ScudRunner page's six, does not fit at
     1024px beside the wordmark and the button. */
  gap: 22px;
}

.masthead__links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
  white-space: nowrap;
}

.masthead__links a:hover {
  color: var(--product);
}

.masthead__cta {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 16px;
  border-radius: 11px;
  background: var(--product);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}

.masthead__cta:hover {
  color: #ffffff;
  filter: brightness(1.06);
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-top: 42px;
  padding-bottom: 46px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow__dash {
  width: 24px;
  height: 1px;
  background: #c9d0dc;
}

.hero__prose {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* The name is the headline and the tagline its second line, so the two read
   as one lockup; the hero's own gap would hold them too far apart. */
.hero__title {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* The mark is set small and raised off the cap height, and takes no part in
   the headline's tight tracking. */
.h1 sup {
  font-size: 0.3em;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 0;
  vertical-align: 1.75em;
  margin-left: 0.08em;
}

.tagline {
  font-family: var(--font-display);
  font-weight: 600;
  /* 23px at 375, 34px at 1440 */
  font-size: clamp(1.4375rem, 1.19rem + 1.03vw, 2.125rem);
  line-height: 1.15;
  letter-spacing: -0.012em;
  color: var(--product);
  margin: 0;
  text-wrap: balance;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding-top: 4px;
}

.hero__actions .btn,
.hero__actions .btn-ghost {
  width: 100%;
}

.meta-list {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.meta-list__dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #c1c9d6;
}

.hero__shot {
  padding-top: 18px;
}

/* --------------------------------------------------------------------------
   Fact strip
   -------------------------------------------------------------------------- */

.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.fact {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 22px 8px;
  text-align: center;
}

.fact:nth-child(-n + 2) {
  border-bottom: 1px solid var(--rim-soft);
}

.fact:nth-child(odd) {
  border-right: 1px solid var(--rim-soft);
}

.fact__value {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
}

/* "NOAA · NWS · FAA" is a phrase, not a number, and cannot hold the same size
   in half a phone screen. */
.fact__value--sources {
  font-size: 18px;
}

/* --------------------------------------------------------------------------
   Feature sections
   -------------------------------------------------------------------------- */

.feature {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-bottom: 56px;
}

.feature__prose {
  display: flex;
  flex-direction: column;
  gap: 20px;
}


/* --------------------------------------------------------------------------
   Dark principles band
   -------------------------------------------------------------------------- */

.principles {
  background: var(--dark);
  padding: 54px 0;
}

.principles__inner {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.principles__head {
  display: flex;
  flex-direction: column;
  gap: 13px;
  max-width: 760px;
}

.principles__head .h2 {
  color: #ffffff;
}

.principles__list {
  display: grid;
  gap: 24px;
}

.principle {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px solid var(--dark-rim);
}

.principle .h3 {
  color: #ffffff;
}

.principle .body-text {
  color: var(--dark-ink);
}

/* --------------------------------------------------------------------------
   TestFlight beta CTA
   -------------------------------------------------------------------------- */

.beta {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 56px;
  padding-bottom: 52px;
}

.beta__head {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.beta__note {
  text-align: left;
}

.beta__actions .btn {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 30px;
  padding-bottom: 44px;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 560px;
}

.footer__nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 4px;
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.footer__nav a,
.footer__col a {
  font-size: 14px;
  color: var(--ink-soft);
}

.footer__nav a:hover,
.footer__col a:hover {
  color: var(--product);
}

/* The desktop footer's "Product" column duplicates the masthead links, which
   are hidden at phone width — so it stays out of the narrow layout entirely
   and the flat footer__nav row carries the ISR links instead. */
.footer__cols {
  display: none;
}

/* --------------------------------------------------------------------------
   Tablet — 680px and up
   -------------------------------------------------------------------------- */

@media (min-width: 680px) {
  :root {
    --gutter: 32px;
  }

  .principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }

  .facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .fact:nth-child(-n + 2) {
    border-bottom: 0;
  }

  .fact:nth-child(odd) {
    border-right: 0;
  }

  .fact:not(:last-child) {
    border-right: 1px solid var(--rim-soft);
  }

  .fact__value--sources {
    font-size: 20px;
  }

  .hero__actions {
    flex-direction: row;
    gap: 14px;
  }

  .hero__actions .btn,
  .hero__actions .btn-ghost,
  .beta__actions .btn {
    width: auto;
  }
}

/* --------------------------------------------------------------------------
   Desktop — 1024px and up. The zigzag, and the only place the layout stops
   being a single column.
   -------------------------------------------------------------------------- */

@media (min-width: 1024px) {
  :root {
    --gutter: 40px;
    --radius-card: 20px;
    --shot-hero: 352px;
    --shot-feature: 307px;
  }

  .mono {
    font-size: 11px;
  }

  .h3 {
    font-size: 21px;
  }

  .lede {
    font-size: 19px;
  }

  .small {
    font-size: 14px;
  }

  .masthead {
    min-height: 84px;
  }

  .masthead__links {
    display: flex;
  }

  .wordmark {
    font-size: 19px;
  }

  .wordmark sup {
    font-size: 11px;
  }

  .masthead__cta {
    height: 44px;
    padding: 0 20px;
    font-size: 15px;
  }

  .hero {
    flex-direction: row;
    align-items: center;
    gap: 72px;
    padding-top: 82px;
    padding-bottom: 74px;
  }

  .hero__title {
    gap: 14px;
  }

  .hero__prose {
    width: 616px;
    gap: 26px;
  }

  .hero__prose .lede {
    max-width: 545px;
  }

  .hero__shot {
    flex-grow: 1;
    padding-top: 0;
  }

  .facts {
    padding: 30px 0;
  }

  .fact {
    padding: 0 8px;
    gap: 7px;
  }

  .fact__value {
    font-size: 30px;
  }

  .fact__value--sources {
    font-size: 30px;
  }

  .feature {
    flex-direction: row;
    align-items: center;
    gap: 84px;
    padding-bottom: 96px;
  }

  .feature__prose {
    width: 560px;
    gap: 22px;
  }

  .feature .shot {
    flex-grow: 1;
    gap: 22px;
  }

  /* Alternate which side the screenshot falls on. Section order is
     load-bearing for the copy, so this is driven by a modifier rather than
     :nth-of-type — moving a section must not silently flip its layout. */
  .feature--shot-first {
    flex-direction: row-reverse;
  }

  .principles {
    padding: 88px 0;
  }

  .principles__inner {
    gap: 46px;
  }

  .principles__head {
    gap: 16px;
  }

  .principles__list {
    gap: 34px;
  }

  .principle {
    gap: 13px;
    padding-top: 26px;
  }

  .beta {
    align-items: center;
    gap: 26px;
    padding-top: 96px;
    padding-bottom: 88px;
  }

  .beta__head {
    align-items: center;
    text-align: center;
    max-width: 680px;
  }

  .beta__head .h2 {
    font-size: 50px;
  }

  .beta__note {
    text-align: center;
  }

  .footer {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: 56px;
    padding-top: 40px;
    padding-bottom: 52px;
  }

  .footer__nav {
    display: none;
  }

  .footer__cols {
    display: flex;
    gap: 56px;
  }
}