/* SankeyFlow — landing page. Plain CSS, no JS. Overlays use :target. */

:root {
  --fg: #1c1c1e;
  --muted: #5f5f66;
  --hairline: rgba(0, 0, 0, 0.12);
  --card: #ffffff;
  --accent: #ff2d78;
  --accent-2: #12cdbd;
  --max: 80%;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.14);
  --grad: linear-gradient(180deg, #bcd6f2 0%, #cfe0f0 34%, #ece4d6 72%, #f3e6cf 100%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f2f2f4;
    --muted: #a6a6ad;
    --hairline: rgba(255, 255, 255, 0.14);
    --card: #191a1c;
    --shadow: 0 12px 44px rgba(0, 0, 0, 0.55);
    --grad: linear-gradient(180deg, #1a2740 0%, #171c26 40%, #211d17 78%, #2a2016 100%);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; background: var(--grad); }

body {
  margin: 0;
  background: var(--grad);
  background-attachment: fixed;
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; }

/* ---------- Layout ---------- */

.page {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 6vh 28px 3vh;
  display: flex;
  align-items: center;
  gap: 56px;
}

.intro {
  flex: 0 0 420px;
  max-width: 420px;
}

.shot {
  flex: 1 1 0%;
  min-width: 0;
}

.shot img {
  width: 100%;
  height: auto;
  display: block;
  /*border-radius: 18px;
  box-shadow: 0 20px 60px -12px rgba(30, 50, 90, 0.35);*/
}

/* ---------- Intro content ---------- */

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}

.brand img {
  width: 80px;
  height: 80px;
  border-radius: 13px;
}

.brand h1 {
  font-size: 26px;
  letter-spacing: -0.02em;
  margin: 0;
}

.tagline {
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin: 0 0 26px;
}

/* ---------- App Store badge (official artwork) ---------- */

.appstore {
  display: inline-block;
  border-radius: 12px;
}

.appstore img {
  display: block;
  width: 190px;
  height: auto;
}

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

/* ---------- Feature bullets ---------- */

.features {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.features li {
  position: relative;
  padding-left: 22px;
  margin: 14px 0;
  color: var(--muted);
  font-size: 15px;
}

.features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.features strong {
  color: var(--fg);
  font-weight: 600;
}

/* ---------- Left-column menu ---------- */

.menu {
  margin-top: 80px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  font-size: 14px;
  color: var(--muted);
  justify-content: center;
}

.menu a {
  text-decoration: none;
  padding-right: 18px;
  margin-right: 4px;
  position: relative;
}

.menu a + a::before {
  content: "·";
  position: absolute;
  left: -11px;
  color: var(--muted);
  opacity: 0.6;
}

.menu a:hover { color: var(--fg); }

/* ---------- Left-column credits ---------- */

.credits {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  font-size: 12px;
  color: var(--muted);
  justify-content: center;
}

.credits a {
  text-decoration: none;
}


.credits a:hover { color: var(--fg); }

/* ---------- Overlays (:target, no JS) ---------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.modal:target {
  opacity: 1;
  pointer-events: auto;
}

.modal__scrim {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

.modal__card {
  position: relative;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--hairline);
  border-radius: 16px;
  box-shadow: var(--shadow);
  width: min(560px, 100%);
  max-height: 82svh;
  overflow-y: auto;
  padding: 30px 32px 34px;
  transform: translateY(8px);
  transition: transform 0.18s ease;
}

.modal:target .modal__card { transform: translateY(0); }

.modal__card h2 {
  margin: 0 0 14px;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.modal__card h3 {
  margin: 22px 0 4px;
  font-size: 15px;
}

.modal__card p { margin: 10px 0; color: var(--muted); }
.modal__card p strong, .modal__card li strong { color: var(--fg); }
.modal__card code {
  font: 13px/1.4 ui-monospace, "SF Mono", Menlo, monospace;
  background: rgba(127, 127, 127, 0.14);
  padding: 1px 5px;
  border-radius: 5px;
}
.modal__card ul { margin: 10px 0; padding-left: 20px; color: var(--muted); }
.modal__card li { margin: 6px 0; }
.modal__card a { color: var(--accent); }

.modal__x {
  position: absolute;
  top: 12px;
  right: 14px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  text-decoration: none;
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
}

.modal__x:hover { background: rgba(127, 127, 127, 0.14); color: var(--fg); }

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

@media (max-width: 880px) {
  .page {
    flex-direction: column;
    gap: 40px;
    padding: 7vh 22px 4vh;
    text-align: center;
  }
  .intro { flex: 0 1 auto; max-width: 460px; }
  .brand { justify-content: center; }
  .features { display: inline-block; text-align: left; }
  .menu { justify-content: center; }
  .shot { order: 2; width: 100%; }
}

@media (max-width: 480px) {
  .tagline { font-size: 20px; }
  .modal__card { padding: 26px 22px 30px; }
}