/* ==========================================================================
   AI Detector — landing page styles
   Design tokens mirror the app's design system (Newsreader / Inter / IBM Plex Mono).
   Inline icon paths: Lucide (ISC) and Phosphor Icons (MIT).
   ========================================================================== */

:root {
  /* Surfaces */
  --bg: #fbfaf7;
  --bg-top: #fffdfa;
  --bg-bottom: #f5f1e9;
  --surface: #ffffff;
  --surface-sunken: #f3f1ec;

  /* Ink */
  --ink: #14161a;
  --ink-secondary: #565c66;
  --ink-muted: #676d75;
  --ink-inverse: #fbfaf7;

  /* Lines */
  --hairline: #e4e0d8;
  --hairline-soft: #ebe7df;

  /* Accents */
  --accent: #14263d;
  --accent-top: #1d3352;
  --accent-bottom: #101e31;
  --accent-edge: #2c4364;
  --human: #1c7a58;
  --human-soft: #e4f0ea;
  --ai: #b5761c;
  --gold: #d9a94a;

  /* Type */
  --font-display: "Newsreader", ui-serif, Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* Radii */
  --radius-pill: 999px;
  --radius-btn: 16px;
  --radius-card: 18px;

  /* Layout */
  --gutter: clamp(20px, 6.7vw, 96px);
  --max-width: 1440px;
  --phone-zoom: 1;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

svg {
  display: block;
  flex: none;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --------------------------------------------------------------------------
   Shared shell
   -------------------------------------------------------------------------- */

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

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

.site-header {
  flex: none;
  height: 88px;
  display: flex;
  align-items: center;
}

.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.brand__mark {
  width: 16px;
  height: 16px;
  border: 3.6px solid var(--human);
  border-radius: 50%;
}

.brand__name {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink);
}

.header-note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-muted);
}

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

.hero {
  flex: 1 0 auto;
  display: flex;
  align-items: center;
  padding-bottom: 24px;
}

.hero .shell {
  display: grid;
  grid-template-columns: minmax(0, 600px) minmax(0, 1fr);
  align-items: center;
  gap: 72px;
}

.hero__copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 30px;
}

.trust {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  background: var(--surface);
  box-shadow:
    0 1px 2px rgba(20, 22, 26, 0.06),
    0 4px 12px rgba(20, 22, 26, 0.04);
  color: var(--ink-secondary);
}

.trust span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.headline {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(3rem, 8.4vw, 5.75rem);
  line-height: 1.02;
  letter-spacing: -0.037em;
  color: var(--ink);
}

.subhead {
  margin: 0;
  max-width: 500px;
  font-size: clamp(1.0625rem, 1.5vw, 1.1875rem);
  line-height: 1.55;
  color: var(--ink-secondary);
}

.fine-print {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

/* --------------------------------------------------------------------------
   Download buttons
   -------------------------------------------------------------------------- */

.store-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  width: 100%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  height: 60px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: 0.012em;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  color: var(--ink-inverse);
  background: linear-gradient(180deg, var(--accent-top) 0%, var(--accent-bottom) 100%);
  border: 1px solid var(--accent-edge);
  box-shadow:
    0 2px 4px rgba(20, 38, 61, 0.14),
    0 10px 26px rgba(20, 38, 61, 0.18);
}

.btn--primary:hover {
  box-shadow:
    0 3px 6px rgba(20, 38, 61, 0.18),
    0 14px 32px rgba(20, 38, 61, 0.22);
}

.btn--secondary {
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow:
    0 1px 2px rgba(20, 22, 26, 0.06),
    0 6px 18px rgba(20, 22, 26, 0.08);
}

.btn--secondary:hover {
  box-shadow:
    0 2px 4px rgba(20, 22, 26, 0.08),
    0 10px 24px rgba(20, 22, 26, 0.1);
}

/* --------------------------------------------------------------------------
   Hero visual — phone mockup
   -------------------------------------------------------------------------- */

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.glow--human {
  width: 560px;
  height: 560px;
  top: 2%;
  left: 50%;
  translate: -50% 0;
  background: radial-gradient(closest-side, rgba(28, 122, 88, 0.15), rgba(28, 122, 88, 0));
}

.glow--gold {
  width: 420px;
  height: 420px;
  bottom: 2%;
  left: 50%;
  translate: -42% 0;
  background: radial-gradient(closest-side, rgba(217, 169, 74, 0.18), rgba(217, 169, 74, 0));
}

.device {
  position: relative;
  z-index: 1;
  zoom: var(--phone-zoom);
  width: 410px;
  padding: 10px;
  border: 1px solid #2b2f36;
  border-radius: 46px;
  background: #14161a;
  box-shadow:
    0 8px 24px rgba(20, 22, 26, 0.12),
    0 32px 70px rgba(20, 22, 26, 0.16);
}

.screen {
  width: 100%;
  border-radius: 36px;
  overflow: hidden;
  background: linear-gradient(180deg, #fffdfa 0%, #f7f3ec 100%);
}

/* Status bar */
.status-bar {
  height: 62px;
  padding: 0 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink);
}

.status-bar__time {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.013em;
}

.status-bar__icons {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Screen body */
.screen__body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 24px 24px 10px;
}

.screen__nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink);
}

.screen__nav span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.17em;
  color: var(--ink-muted);
}

.screen__title-block {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.screen__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 32px;
  line-height: 1.14;
  letter-spacing: -0.028em;
  color: var(--ink);
}

.screen__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.105em;
  color: var(--ink-muted);
}

.result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

/* Score ring */
.ring {
  position: relative;
  width: 296px;
  height: 296px;
}

.ring > svg {
  position: absolute;
  inset: 0;
}

.ring__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.ring__value {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 56px;
  line-height: 1;
  letter-spacing: -0.023em;
  color: var(--ink);
}

.ring__verdict {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.145em;
  color: var(--human);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 11px;
  border-radius: var(--radius-pill);
  background: var(--human-soft);
  color: var(--human);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

/* Analysed text card */
.text-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow:
    0 1px 2px rgba(20, 22, 26, 0.05),
    0 6px 18px rgba(20, 22, 26, 0.04);
}

.text-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--hairline-soft);
}

.text-card__header > span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  background: var(--surface-sunken);
  color: var(--ink-secondary);
  font-size: 12px;
  font-weight: 500;
}

.text-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.62;
  color: var(--ink-secondary);
}

/* In-app CTA */
.screen__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 56px;
  border: 1px solid var(--accent-edge);
  border-radius: var(--radius-btn);
  background: linear-gradient(180deg, var(--accent-top) 0%, var(--accent-bottom) 100%);
  color: var(--ink-inverse);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: 0.012em;
  box-shadow:
    0 2px 4px rgba(20, 38, 61, 0.14),
    0 10px 26px rgba(20, 38, 61, 0.18);
}

.home-indicator {
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.home-indicator span {
  width: 134px;
  height: 5px;
  border-radius: 3px;
  background: rgba(20, 22, 26, 0.55);
}

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

.site-footer {
  flex: none;
  height: 72px;
  display: flex;
  align-items: center;
  border-top: 1px solid var(--hairline-soft);
}

.site-footer .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
}

.site-footer .copyright {
  color: var(--ink-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.footer-links a {
  color: var(--ink-secondary);
  transition: color 140ms ease;
}

.footer-links a:hover {
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   Legal pages
   -------------------------------------------------------------------------- */

.legal {
  flex: 1 0 auto;
  padding: clamp(32px, 5vw, 64px) 0 clamp(64px, 8vw, 112px);
}

.legal .shell {
  max-width: calc(720px + 2 * var(--gutter));
}

.legal__header {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-bottom: 32px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--hairline-soft);
}

.legal h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.25rem, 5.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.legal__updated {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

.legal section {
  margin-bottom: 36px;
}

.legal h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.017em;
}

.legal p,
.legal li {
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--ink-secondary);
}

.legal p {
  margin: 0 0 14px;
}

.legal ul {
  margin: 0 0 14px;
  padding-left: 22px;
}

.legal li {
  margin-bottom: 8px;
}

.legal a:not(.brand) {
  color: var(--human);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
  transition: color 140ms ease;
}

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

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1200px) {
  .hero .shell {
    gap: 40px;
    grid-template-columns: minmax(0, 520px) minmax(0, 1fr);
  }

  :root {
    --phone-zoom: 0.86;
  }
}

@media (max-width: 960px) {
  :root {
    --phone-zoom: 0.78;
  }

  .hero .shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
    justify-items: start;
  }

  .hero {
    padding-top: 8px;
    padding-bottom: 56px;
  }

  .hero__copy {
    max-width: 600px;
  }

  .hero__visual {
    width: 100%;
  }

  .glow--human,
  .glow--gold {
    display: none;
  }
}

@media (max-width: 560px) {
  :root {
    --phone-zoom: 0.7;
  }

  .site-header {
    height: 72px;
  }

  .header-note {
    display: none;
  }

  .hero__copy {
    gap: 24px;
  }

  .store-buttons .btn {
    flex: 1 1 100%;
  }

  .site-footer {
    height: auto;
    padding: 20px 0;
  }

  .site-footer .shell {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

@media (max-width: 400px) {
  :root {
    --phone-zoom: 0.62;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}