/* POLARIS OBSERVATORY — scientific-instrument aesthetic
   ink-blue paper, amber instrument markings, precise linework. */

:root {
  --ink: #0a0e1a;
  --ink-2: #0d1322;
  --ink-3: #111a30;
  --amber: #ffd98e;
  --amber-dim: #c9a45e;
  --pale: #dfe7ff;
  --pale-dim: #99a4c4;
  --line: rgba(223, 231, 255, .14);
  --line-amber: rgba(255, 217, 142, .35);
  --serif: "Spectral", Georgia, serif;
  --mono: "Space Mono", ui-monospace, monospace;
  --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--ink);
  color: var(--pale);
  font-family: var(--serif);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* faint blueprint grid over the whole page */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(223,231,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(223,231,255,.025) 1px, transparent 1px);
  background-size: 72px 72px;
  z-index: 0;
}

main { position: relative; z-index: 1; }
.mono { font-family: var(--mono); letter-spacing: .08em; }
.amber { color: var(--amber); }
em { font-style: italic; }

::selection { background: var(--amber); color: var(--ink); }

a { color: var(--amber); text-decoration-thickness: 1px; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: 1rem; top: -3rem; z-index: 100;
  background: var(--amber); color: var(--ink);
  padding: .5rem 1rem; font-family: var(--mono); font-size: .8rem;
  transition: top .2s;
}
.skip:focus { top: 1rem; }

/* ---------- nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem clamp(1rem, 4vw, 2.5rem);
  transition: background .4s, border-color .4s, backdrop-filter .4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10, 14, 26, .82);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--line);
}
.nav-mark {
  display: flex; align-items: center; gap: .6rem;
  color: var(--pale); text-decoration: none;
  font-family: var(--mono); font-size: .95rem; letter-spacing: .06em;
}
.nav-mark em { font-style: normal; color: var(--amber); }
.nav nav { display: flex; align-items: center; gap: clamp(.9rem, 2.2vw, 1.8rem); }
.nav nav a {
  color: var(--pale-dim); text-decoration: none;
  font-family: var(--mono); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase;
  transition: color .25s;
}
.nav nav a:hover { color: var(--amber); }
.nav-cta {
  color: var(--ink) !important;
  background: var(--amber);
  padding: .5rem .9rem;
  border-radius: 2px;
}
.nav-cta:hover { color: var(--ink) !important; background: #ffe6b3; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  height: 100svh; min-height: 560px;
  overflow: hidden;
  display: flex; align-items: flex-end;
}
#sky-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
  cursor: crosshair;
}
.hero-frame { position: absolute; inset: clamp(12px, 2vw, 26px); pointer-events: none; }
.hf-corner {
  position: absolute; width: 26px; height: 26px;
  border: 1px solid var(--line-amber);
}
.hf-corner.tl { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.hf-corner.tr { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.hf-corner.bl { bottom: 0; left: 0; border-right: 0; border-top: 0; }
.hf-corner.br { bottom: 0; right: 0; border-left: 0; border-top: 0; }

.hero-copy {
  position: relative; z-index: 2;
  padding: 0 clamp(1.2rem, 5vw, 4.5rem) clamp(5.5rem, 11vh, 8rem);
  max-width: 780px;
  pointer-events: none;
}
.hero-copy a, .hero-copy .amber { pointer-events: auto; }
.hero-kicker {
  font-size: .72rem; color: var(--amber);
  margin-bottom: 1.2rem;
}
.hero-title {
  font-weight: 200;
  font-size: clamp(2.6rem, 7.2vw, 5.4rem);
  line-height: 1.04;
  letter-spacing: -.01em;
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title .line span {
  display: inline-block;
  transform: translateY(110%);
}
.hero-sub {
  margin-top: 1.4rem;
  max-width: 46ch;
  color: var(--pale-dim);
  font-size: clamp(.98rem, 1.4vw, 1.1rem);
}
.hero-readout {
  position: absolute; right: clamp(1.2rem, 3.4vw, 3rem); top: 50%;
  transform: translateY(-50%);
  display: flex; flex-direction: column; gap: .7rem;
  font-size: .64rem; color: var(--pale-dim);
  text-align: right;
  border-right: 1px solid var(--line-amber);
  padding-right: .9rem;
  z-index: 2; pointer-events: none;
}
.hero-readout span::after {
  content: ""; display: block; width: 18px; height: 1px;
  background: var(--line); margin: .5rem 0 0 auto;
}
.hero-readout span:last-child::after { display: none; }
#ro-stars { color: var(--amber); }
.hero-scroll {
  position: absolute; left: 50%; bottom: 1.4rem; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  font-size: .62rem; color: var(--pale-dim);
  z-index: 2; pointer-events: none;
}
.hero-scroll svg { animation: drop 2.6s ease-in-out infinite; }
@keyframes drop { 0%, 100% { transform: translateY(0); opacity: .5; } 50% { transform: translateY(6px); opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .hero-scroll svg { animation: none; } }

/* ---------- shared section chrome ---------- */
section { position: relative; scroll-margin-top: 64px; }
.section-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4.5rem, 10vh, 7.5rem) clamp(1.2rem, 4vw, 2.5rem) clamp(2rem, 4vh, 3rem);
}
.chapter {
  font-size: .7rem; color: var(--amber);
  margin-bottom: 1.1rem;
  display: inline-flex; align-items: center; gap: .8rem;
}
.chapter::after { content: ""; width: 56px; height: 1px; background: var(--line-amber); }
h2 {
  font-weight: 200;
  font-size: clamp(1.9rem, 4.6vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -.01em;
}
h2 em { color: var(--amber); font-weight: 300; }

/* ---------- observatory ---------- */
.observatory {
  border-top: 1px solid var(--line);
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(255,217,142,.05), transparent 65%),
    var(--ink);
}
.obs-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem) clamp(4.5rem, 9vh, 7rem);
  display: grid;
  grid-template-columns: minmax(280px, 420px) 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.obs-dial { position: sticky; top: 90px; }
.obs-dial svg { width: 100%; height: auto; display: block; }
.obs-dial-caption {
  margin-top: .9rem; text-align: center;
  font-size: .66rem; color: var(--pale-dim);
}
.obs-copy .lede {
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  font-weight: 300;
  color: var(--pale);
  margin-bottom: 1.4rem;
}
.obs-copy p { margin-bottom: 1.2rem; color: var(--pale-dim); max-width: 58ch; }
.obs-stats {
  list-style: none;
  margin-top: 2.4rem;
  display: grid; grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
}
.obs-stats li {
  padding: 1.2rem 1.3rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.obs-stats li:nth-child(2n) { border-right: 0; }
.obs-stats li:nth-child(n+3) { border-bottom: 0; }
.obs-stats strong {
  display: block;
  color: var(--amber); font-weight: 700;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  letter-spacing: 0;
}
.obs-stats span { font-size: .68rem; color: var(--pale-dim); letter-spacing: .05em; }

/* ---------- scale walk ---------- */
.scale {
  border-top: 1px solid var(--line);
  background: var(--ink-2);
}
.scale-pin {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: clamp(4rem, 8vh, 6rem) 0 2.5rem;
  gap: clamp(1.4rem, 3vh, 2.4rem);
}
.scale-head {
  max-width: var(--max); width: 100%;
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem);
}
.scale-note { margin-top: 1rem; font-size: .64rem; color: var(--pale-dim); }
.scale-viewport {
  width: 100%;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(rgba(223,231,255,.03) 1px, transparent 1px) 0 0 / 100% 24px,
    var(--ink);
}
.scale-viewport.native-scroll { overflow-x: auto; overscroll-behavior-x: contain; scrollbar-color: var(--amber-dim) var(--ink); }
.scale-strip {
  position: relative;
  height: clamp(420px, 62vh, 560px);
  will-change: transform;
}
/* the ecliptic rule line */
.scale-rule {
  position: absolute; left: 0; top: 52%; height: 1px; width: 100%;
  background: var(--line-amber);
}
.scale-tick {
  position: absolute; top: 52%;
  width: 1px; height: 10px; margin-top: -5px;
  background: var(--line-amber);
}
.scale-tick.minor { height: 5px; margin-top: -2.5px; opacity: .5; }
.scale-tick-label {
  position: absolute; top: calc(52% + 14px);
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: .58rem; letter-spacing: .1em;
  color: var(--pale-dim);
  white-space: nowrap;
}
.body-node { position: absolute; top: 52%; transform: translate(-50%, -50%); }
.body-node svg { display: block; overflow: visible; }
.body-caption {
  position: absolute; left: 50%; transform: translateX(-50%);
  text-align: center; white-space: nowrap;
}
.body-caption .b-name {
  font-family: var(--serif); font-weight: 300;
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  color: var(--pale); letter-spacing: .04em;
}
.body-caption .b-data {
  font-family: var(--mono); font-size: .6rem; letter-spacing: .08em;
  color: var(--pale-dim); line-height: 1.9; margin-top: .3rem;
}
.body-caption .b-data b { color: var(--amber); font-weight: 400; }
.b-here {
  font-family: var(--mono); font-size: .6rem; letter-spacing: .18em;
  color: var(--amber);
  margin-bottom: .35rem;
}
.body-caption.above { display: flex; flex-direction: column-reverse; }
.body-caption.above .b-here { margin: .35rem 0 0; }
.body-caption.above .b-data { margin: 0 0 .3rem; }
.void-note {
  position: absolute; top: 30%;
  transform: translateX(-50%);
  font-family: var(--mono); font-size: .62rem; letter-spacing: .14em;
  color: rgba(153, 164, 196, .8);
  white-space: nowrap;
}
.scale-hint {
  text-align: center; font-size: .62rem; color: var(--pale-dim);
  transition: opacity .5s;
}
.scale-hint.gone { opacity: 0; }

/* ---------- programmes ---------- */
.programmes { border-top: 1px solid var(--line); }
.prog-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem) clamp(4.5rem, 9vh, 7rem);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.prog-card {
  background: var(--ink);
  padding: clamp(1.6rem, 3vw, 2.4rem);
  display: flex; flex-direction: column;
  transition: background .35s;
}
.prog-card:hover { background: var(--ink-3); }
.prog-glyph { width: 96px; height: 96px; margin-bottom: 1.4rem; }
.prog-card h3 {
  font-weight: 300; font-size: 1.35rem; letter-spacing: .01em;
  margin-bottom: .7rem;
}
.prog-card > p { color: var(--pale-dim); font-size: .95rem; flex: 1; }
.prog-meta {
  list-style: none;
  margin: 1.4rem 0;
  font-size: .62rem; color: var(--pale-dim); line-height: 2.1;
}
.prog-meta li::before { content: "— "; color: var(--amber-dim); }
.prog-link {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--amber); text-decoration: none;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}
.prog-link:hover { text-decoration: underline; }

/* ---------- calendar ---------- */
.calendar { border-top: 1px solid var(--line); background: var(--ink-2); }
.cal-list {
  list-style: none;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem) clamp(4.5rem, 9vh, 7rem);
}
.cal-row {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: baseline;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}
.cal-row:first-child { border-top: 1px solid var(--line); }
.cal-date { font-size: .78rem; color: var(--amber); }
.cal-body h3 { font-weight: 300; font-size: 1.2rem; margin-bottom: .3rem; }
.cal-body p { color: var(--pale-dim); font-size: .92rem; max-width: 62ch; }
.cal-tag {
  font-size: .58rem; color: var(--pale-dim);
  border: 1px solid var(--line); border-radius: 999px;
  padding: .3rem .7rem;
  white-space: nowrap;
}

/* ---------- booking ---------- */
.booking {
  border-top: 1px solid var(--line);
  background:
    radial-gradient(900px 480px at 12% 110%, rgba(255,217,142,.06), transparent 65%),
    var(--ink);
}
.booking-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4.5rem, 10vh, 7.5rem) clamp(1.2rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(300px, 480px);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}
.booking-sub { color: var(--pale-dim); margin-top: 1.3rem; max-width: 48ch; }
.booking-cond {
  margin-top: 2.2rem;
  border: 1px solid var(--line);
  padding: 1rem 1.2rem;
  display: flex; flex-direction: column; gap: .4rem;
  font-size: .66rem;
}
.booking-cond span:first-child { color: var(--pale-dim); }
#cond-readout { color: var(--amber); }

.booking-form { border: 1px solid var(--line); padding: clamp(1.4rem, 3vw, 2.2rem); background: var(--ink-2); }
.field { margin-bottom: 1.2rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field label {
  display: block;
  font-family: var(--mono); font-size: .62rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--pale-dim);
  margin-bottom: .45rem;
}
.field input, .field select {
  width: 100%;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--pale);
  font-family: var(--mono); font-size: .85rem;
  padding: .7rem .8rem;
  transition: border-color .25s;
  color-scheme: dark;
}
.field input:focus, .field select:focus { border-color: var(--amber); outline: none; }
.btn-book {
  width: 100%;
  background: var(--amber); color: var(--ink);
  border: 0; border-radius: 2px;
  font-family: var(--mono); font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  padding: .95rem;
  cursor: pointer;
  transition: background .25s, transform .15s;
}
.btn-book:hover { background: #ffe6b3; }
.btn-book:active { transform: translateY(1px); }
.booking-note { margin-top: .9rem; font-size: .58rem; color: var(--pale-dim); text-align: center; }
.booking-confirm {
  margin-top: 1rem; text-align: center;
  color: var(--amber); font-style: italic;
  min-height: 1.4em;
}

/* ---------- visit ---------- */
.visit { border-top: 1px solid var(--line); background: var(--ink-2); }
.visit-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 9vh, 6.5rem) clamp(1.2rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(300px, 1.3fr);
  gap: clamp(2rem, 5vw, 5rem);
}
.visit-list { border-left: 1px solid var(--line-amber); }
.visit-list div {
  display: grid; grid-template-columns: 130px 1fr;
  gap: 1rem;
  padding: .9rem 0 .9rem 1.4rem;
  border-bottom: 1px solid var(--line);
  font-size: .74rem;
}
.visit-list div:last-child { border-bottom: 0; }
.visit-list dt { color: var(--amber); letter-spacing: .12em; }
.visit-list dd { color: var(--pale-dim); line-height: 1.7; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 2.4rem clamp(1.2rem, 4vw, 2.5rem) 2.8rem;
}
.footer-row {
  max-width: var(--max); margin: 0 auto 1.6rem;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.footer-mark { font-family: var(--mono); letter-spacing: .06em; }
.footer-mark em { font-style: normal; color: var(--amber); }
.footer-row nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.footer-row nav a {
  color: var(--pale-dim); text-decoration: none;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase;
}
.footer-row nav a:hover { color: var(--amber); }
.footer-fine {
  max-width: var(--max); margin: 0 auto;
  font-size: .6rem; color: var(--pale-dim); line-height: 2;
}
.footer-fine a { color: var(--pale-dim); }
.footer-fine a:hover { color: var(--amber); }

/* ---------- reveals (JS adds .in) ---------- */
.rv { opacity: 0; transform: translateY(28px); transition: opacity 1s ease, transform 1s cubic-bezier(.19,1,.22,1); }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .hero-title .line span { transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .obs-grid { grid-template-columns: 1fr; }
  .obs-dial { position: static; max-width: 360px; margin: 0 auto; }
  .booking-inner { grid-template-columns: 1fr; }
  .visit-grid { grid-template-columns: 1fr; }
  .hero-readout { display: none; }
}
@media (max-width: 640px) {
  .nav nav a:not(.nav-cta) { display: none; }
  .br-d { display: none; }
  .cal-row { grid-template-columns: 1fr; gap: .5rem; }
  .cal-tag { justify-self: start; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .obs-stats { grid-template-columns: 1fr; }
  .obs-stats li { border-right: 0 !important; border-bottom: 1px solid var(--line) !important; }
  .obs-stats li:last-child { border-bottom: 0 !important; }
  .visit-list div { grid-template-columns: 1fr; gap: .2rem; }
}