/* Lightcode Astrology - shared styles.
   Plain CSS, no build step, no external requests. Colours and type follow the app
   (Docs/PRODUCT-BRIEF.md and OPEN-QUESTIONS "Decided by Allen"). */

@font-face {
  font-family: "LIGHTCODE Astrotech";
  src: url("fonts/LIGHTCODE-Astrotech-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #191a1a;
  --text: #e0e0e0;
  --text-2: #898989;
  --hairline: #6b6b6b;
  --star: #444444;
  --violet: #a58def;
  --blue: #23a9ef;
  --mint: #7dfcdf;
  --iridescent: linear-gradient(90deg, var(--violet) 0%, var(--blue) 50%, var(--mint) 100%);
  --gutter: 16px;
  --column: 40rem;
  --display: "LIGHTCODE Astrotech", "Avenir Next", "Futura", "Century Gothic", system-ui, sans-serif;
  /* Legal and support paragraphs use the reader's system text face (see README "Typography"). */
  --reading: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--display);
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.01em; /* the app's default tracking of +10 */
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

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

/* ---------- Star dots: tiny grey squares that twinkle (CSS only) ---------- */

.sky {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.sky__layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 2px;
  opacity: 0.15;
  animation: twinkle 7s ease-in-out infinite;
}

.sky__layer--1 {
  animation-duration: 6.5s;
  box-shadow:
    76.2vw 62.1vh var(--star), 3.9vw 33.5vh var(--star), 57vw 78.1vh var(--star), 82.6vw 25vh var(--star),
    3.7vw 65.8vh var(--star), 78.8vw 89.4vh var(--star), 18.2vw 94.8vh var(--star), 18.4vw 60.9vh var(--star),
    82.3vw 60.8vh var(--star), 16.9vw 20.5vh var(--star), 71.6vw 82.4vh var(--star), 22.3vw 64.3vh var(--star),
    52vw 28.3vh var(--star), 6.1vw 22.6vh var(--star), 43.4vw 67.8vh var(--star), 68.7vw 12.2vh var(--star),
    93.4vw 88.6vh var(--star), 93.6vw 33.2vh var(--star), 86.2vw 51.5vh var(--star);
}

.sky__layer--2 {
  animation-duration: 8s;
  animation-delay: -2.1s;
  box-shadow:
    58.9vw 72.9vh var(--star), 92.7vw 24.1vh var(--star), 85.6vw 9.1vh var(--star), 77.6vw 97.2vh var(--star),
    46.1vw 63.4vh var(--star), 72.7vw 16.6vh var(--star), 41vw 88.5vh var(--star), 72.4vw 45.4vh var(--star),
    22.3vw 38.2vh var(--star), 28.1vw 34.6vh var(--star), 38.9vw 48.7vh var(--star), 1.7vw 56.7vh var(--star),
    5vw 4.7vh var(--star), 73.6vw 20.3vh var(--star), 7.1vw 6.7vh var(--star), 77vw 3.3vh var(--star),
    53.9vw 39.1vh var(--star), 97.8vw 67.6vh var(--star), 57.8vw 9vh var(--star);
}

.sky__layer--3 {
  animation-duration: 9.5s;
  animation-delay: -5.3s;
  box-shadow:
    76.3vw 25.8vh var(--star), 98.8vw 23.3vh var(--star), 63.8vw 80vh var(--star), 71.9vw 69.5vh var(--star),
    78.5vw 5.8vh var(--star), 69.1vw 56.6vh var(--star), 86.4vw 73.1vh var(--star), 15.8vw 96.3vh var(--star),
    28.2vw 42.6vh var(--star), 62.5vw 17.1vh var(--star), 45.7vw 64.9vh var(--star), 19.4vw 78.5vh var(--star),
    44.8vw 95.7vh var(--star), 14.2vw 1.9vh var(--star), 23.9vw 72.3vh var(--star), 10vw 13.1vh var(--star);
}

.sky__layer--4 {
  animation-duration: 11s;
  animation-delay: -7.7s;
  box-shadow:
    64.6vw 85.9vh var(--star), 96.5vw 4vh var(--star), 25.9vw 57.3vh var(--star), 61.7vw 35vh var(--star),
    10.7vw 21.4vh var(--star), 85.6vw 91.3vh var(--star), 7.2vw 41.2vh var(--star), 84.1vw 39.6vh var(--star),
    24.7vw 89.7vh var(--star), 37.4vw 14.5vh var(--star), 35vw 62.7vh var(--star), 38vw 33.9vh var(--star),
    70.5vw 4.2vh var(--star), 54.7vw 28.9vh var(--star), 45.5vw 47.4vh var(--star), 50.2vw 95.5vh var(--star),
    10vw 53.5vh var(--star);
}

@keyframes twinkle {
  0%,
  100% {
    opacity: 0.15;
  }
  50% {
    opacity: 1;
  }
}

/* ---------- Page frame ---------- */

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--hairline);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--gutter);
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: calc(var(--column) + 2 * var(--gutter));
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

main {
  flex: 1 0 auto;
}

.site-header {
  padding-top: 2rem;
  padding-bottom: 0.5rem;
}

.site-header a {
  display: block;
  width: 9.5rem;
  margin: 0 auto;
}

.site-header img {
  width: 100%;
  height: auto;
}

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

.caps {
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.grad {
  color: var(--blue);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .grad {
    background-image: var(--iridescent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 400;
  text-transform: uppercase;
  line-height: 1.35;
  margin: 0;
}

h1 {
  font-size: 1.35rem;
  letter-spacing: 0.2em;
}

h2 {
  font-size: 1rem;
  letter-spacing: 0.18em;
}

h3 {
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  color: var(--text);
}

a {
  color: var(--mint);
  text-decoration-color: var(--hairline);
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: currentColor;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.muted {
  color: var(--text-2);
}

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

/* ---------- Ornamental divider: broken hairline with a four-point star ---------- */

.divider {
  width: 100%;
  max-width: 317px;
  height: auto;
  margin: 2rem auto;
  overflow: visible;
}

.divider__line {
  fill: none;
  stroke: var(--hairline);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.divider__star {
  fill: none;
  stroke: var(--text-2);
  stroke-width: 1;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
  animation: star-pulse 6s ease-in-out infinite;
}

@keyframes star-pulse {
  0%,
  100% {
    opacity: 0.55;
  }
  50% {
    opacity: 1;
  }
}

/* ---------- Landing ---------- */

.hero {
  text-align: center;
  padding-top: 3rem;
}

.hero h1 {
  width: min(100%, 22rem);
  margin: 0 auto;
}

.hero h1 img {
  width: 100%;
  height: auto;
}

.tagline {
  margin: 1.25rem 0 0;
  font-size: 0.9rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text);
}

.words {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

.words li {
  margin-right: -0.3em; /* cancel the trailing tracking so the words centre */
}

.features {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.75rem;
}

.features h3 {
  display: inline-block; /* the gradient spans the words, not the column */
  margin-bottom: 0.4rem;
}

.features p {
  margin: 0;
  color: var(--text-2);
  line-height: 1.55;
}

.coming-soon {
  width: fit-content;
  max-width: 100%;
  margin: 0.5rem auto 0;
  text-align: center;
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.note-line {
  margin: 1rem auto 0;
  max-width: 30rem;
  text-align: center;
  color: var(--text-2);
  font-size: 0.95rem;
}

/* Acknowledgements on the landing page */

.credits {
  margin-top: 1rem;
  font-family: var(--reading);
  letter-spacing: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-2);
}

.credits h2 {
  color: var(--text);
  margin-bottom: 1rem;
}

.credits p {
  margin: 0 0 0.85rem;
}

.credits details {
  margin-top: 1rem;
  border-top: 1px solid #333535;
  padding-top: 0.85rem;
}

.credits summary {
  cursor: pointer;
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  color: var(--text);
}

.credits pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.5;
  margin: 0.85rem 0 1.25rem;
}

/* ---------- Reading pages (privacy, terms, support) ---------- */

.page-title {
  text-align: center;
  padding-top: 2rem;
}

/* Gradient headings are only as wide as their words, so short titles show the whole
   violet-blue-mint sweep instead of one slice of a column-wide gradient. */
.page-title h1.grad,
.lost h1.grad,
.prose h2.grad {
  width: fit-content;
  max-width: 100%;
}

.page-title h1.grad,
.lost h1.grad {
  margin-left: auto;
  margin-right: auto;
}

.page-title p {
  margin: 0.75rem 0 0;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
}

.prose {
  font-family: var(--reading);
  letter-spacing: 0;
  font-size: 1.0625rem;
  line-height: 1.65;
}

.prose section {
  margin-top: 2.75rem;
}

.prose h2 {
  margin-bottom: 1rem;
}

.prose h3 {
  margin: 1.75rem 0 0.5rem;
}

.prose p {
  margin: 0 0 1rem;
}

.prose strong {
  font-weight: 600;
  color: #f0f0f0;
}

.prose ul {
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.prose li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.6rem;
}

/* list markers are tiny squares, like the star dots */
.prose li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.68em;
  width: 5px;
  height: 5px;
  background: var(--iridescent);
}

.summary {
  margin-top: 2rem;
  padding: 1.25rem var(--gutter);
  border: 1px solid var(--hairline);
  border-image: var(--iridescent) 1;
}

.summary h2 {
  margin-bottom: 0.85rem;
}

.summary ul {
  margin: 0;
}

.summary li:last-child {
  margin-bottom: 0;
}

/* ---------- 404 ---------- */

.lost {
  text-align: center;
  padding-top: 4rem;
}

.lost p {
  color: var(--text-2);
  margin: 1rem 0 0;
}

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

.site-footer {
  padding-top: 1rem;
  padding-bottom: 2.5rem;
  text-align: center;
  font-size: 0.8rem;
}

.site-footer nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer nav a {
  display: inline-block;
  padding: 0.5rem 0.25rem; /* comfortable touch target */
  color: var(--text-2);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.site-footer nav a:hover,
.site-footer nav a[aria-current="page"] {
  color: var(--text);
}

.site-footer .copyright {
  margin: 1rem 0 0;
  color: var(--text-2);
  letter-spacing: 0.08em;
}

/* ---------- Larger screens ---------- */

@media (min-width: 640px) {
  :root {
    --gutter: 24px;
  }

  .site-header a {
    width: 11rem;
  }

  .hero {
    padding-top: 5rem;
  }

  h1 {
    font-size: 1.6rem;
  }

  .tagline {
    font-size: 1rem;
  }

  .features {
    grid-template-columns: 1fr 1fr;
    gap: 2.25rem 2.5rem;
  }
}

/* ---------- Preferences ---------- */

@media (prefers-reduced-motion: reduce) {
  .sky__layer,
  .divider__star {
    animation: none;
  }

  .sky__layer {
    opacity: 0.6;
  }

  .divider__star {
    opacity: 1;
  }
}

@media (forced-colors: active) {
  .grad {
    background: none;
    color: CanvasText;
  }

  .sky {
    display: none;
  }
}

@media print {
  .sky,
  .skip-link {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .grad {
    background: none;
    color: #000;
  }
}