/* ==========================================================================
   Elzor.website — Midnight Observatory
   Precision without noise.
   ========================================================================== */

:root {
  --midnight: #0B1014;
  --deep-navy: #111C24;
  --blue-gray: #26343D;
  --moon-white: #E9E7DE;
  --soft-gray: #8B9293;
  --copper: #C98252;
  --pale-copper: #E2B28F;
  --deep-black: #06090C;
  --copper-deep: #8E563B;

  --copper-gradient: linear-gradient(
    135deg,
    #C98252 0%,
    #E2B28F 48%,
    #8E563B 100%
  );

  --border-fine: 1px solid rgba(233, 231, 222, 0.14);
  --border-copper: rgba(201, 130, 82, 0.7);

  --font-display: "Sora", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  --nav-height: 64px;
  --container: min(1200px, calc(100% - 48px));
  --radius-btn: 8px;
  --ease-precise: cubic-bezier(0.22, 1, 0.36, 1);
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--moon-white);
  background-color: var(--midnight);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul,
ol {
  list-style: none;
}

button,
summary {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-2);
  z-index: 1000;
  padding: var(--space-1) var(--space-2);
  background: var(--copper);
  color: var(--deep-black);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-btn);
}

.skip-link:focus {
  top: var(--space-2);
}

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

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--soft-gray);
  margin-bottom: var(--space-3);
}

.section-label--dark {
  color: var(--blue-gray);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--moon-white);
  margin-bottom: var(--space-5);
}

.section-head {
  margin-bottom: var(--space-5);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 48px;
  padding: 12px 24px;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius-btn);
  transition:
    transform 0.35s var(--ease-precise),
    box-shadow 0.35s var(--ease-precise),
    border-color 0.35s var(--ease-precise),
    color 0.35s var(--ease-precise),
    filter 0.35s var(--ease-precise);
}

.btn--primary {
  background: var(--copper-gradient);
  color: var(--deep-black);
  border: 1px solid transparent;
}

.btn--primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 8px 24px rgba(201, 130, 82, 0.22);
}

.btn--secondary {
  background: transparent;
  color: var(--moon-white);
  border: 1px solid var(--moon-white);
}

.btn--secondary:hover {
  border-color: var(--copper);
  color: var(--copper);
}

/* --------------------------------------------------------------------------
   1. Navigation
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 16, 20, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(233, 231, 222, 0.1);
}

.nav {
  width: var(--container);
  margin-inline: auto;
  min-height: var(--nav-height);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-2);
}

.nav__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav__marker {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--copper);
  align-self: center;
  margin-right: 2px;
}

.nav__name {
  font-size: 0.9375rem;
}

.nav__tld {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--soft-gray);
  letter-spacing: 0.08em;
}

.nav__center {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--soft-gray);
  text-align: center;
}

.nav__mobile-code {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--soft-gray);
  text-align: center;
}

.nav__action {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--moon-white);
  transition: color 0.3s var(--ease-precise);
}

.nav__action:hover {
  color: var(--copper);
}

.nav__menu {
  display: none;
  justify-self: end;
  position: relative;
}

.nav__menu-toggle {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--moon-white);
  padding: var(--space-1) 0;
}

.nav__menu-toggle::-webkit-details-marker {
  display: none;
}

.nav__menu-panel {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 200px;
  padding: var(--space-2);
  background: var(--deep-navy);
  border: var(--border-fine);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav__menu-panel a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: var(--space-1);
  color: var(--moon-white);
  transition: color 0.25s var(--ease-precise);
}

.nav__menu-panel a:hover {
  color: var(--copper);
}

/* --------------------------------------------------------------------------
   2. Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  background:
    radial-gradient(
      circle at 70% 35%,
      rgba(201, 130, 82, 0.13),
      transparent 34%
    ),
    radial-gradient(
      circle at 20% 70%,
      rgba(38, 52, 61, 0.35),
      transparent 45%
    ),
    var(--midnight);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(233, 231, 222, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 231, 222, 0.035) 1px, transparent 1px);
  background-size: calc(100% / 12) 80px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), transparent 85%);
  pointer-events: none;
}

.hero__atmosphere::before,
.hero__atmosphere::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: var(--moon-white);
  opacity: 0.35;
  pointer-events: none;
}

.hero__atmosphere::before {
  width: 2px;
  height: 2px;
  top: 18%;
  left: 42%;
  box-shadow:
    120px 80px 0 0 rgba(233, 231, 222, 0.25),
    -80px 140px 0 0 rgba(233, 231, 222, 0.2),
    220px 40px 0 0.5px rgba(233, 231, 222, 0.18),
    40px 260px 0 0 rgba(233, 231, 222, 0.22),
    300px 180px 0 0 rgba(233, 231, 222, 0.15);
}

.hero__atmosphere::after {
  width: 1.5px;
  height: 1.5px;
  top: 32%;
  right: 18%;
  box-shadow:
    -40px 60px 0 0 rgba(233, 231, 222, 0.2),
    60px 120px 0 0 rgba(233, 231, 222, 0.18),
    -100px 200px 0 0.5px rgba(233, 231, 222, 0.16);
}

.hero__inner {
  width: var(--container);
  margin: 0 auto;
  flex: 1;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-6) 0 var(--space-8);
  position: relative;
  z-index: 1;
}

.hero__meta {
  grid-column: 1 / 4;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--soft-gray);
  line-height: 1.9;
  animation: fade-rise 1.2s var(--ease-precise) both;
}

.hero__content {
  grid-column: 1 / 7;
  align-self: center;
  margin-top: var(--space-5);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4rem, 10vw, 10.5rem);
  line-height: 0.86;
  letter-spacing: -0.065em;
  text-align: left;
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-4);
}

.hero__title span {
  display: block;
  animation: fade-rise 1.1s var(--ease-precise) both;
}

.hero__title span:nth-child(1) { animation-delay: 0.05s; }
.hero__title span:nth-child(2) { animation-delay: 0.15s; }
.hero__title span:nth-child(3) { animation-delay: 0.25s; }
.hero__title span:nth-child(4) { animation-delay: 0.35s; }

.hero__title-accent {
  background: var(--copper-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lead {
  max-width: 28ch;
  font-size: 1rem;
  color: var(--soft-gray);
  margin-bottom: var(--space-4);
  animation: fade-rise 1.2s 0.4s var(--ease-precise) both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  animation: fade-rise 1.2s 0.5s var(--ease-precise) both;
}

.hero__instrument {
  grid-column: 7 / 13;
  justify-self: end;
  position: relative;
  width: min(420px, 100%);
  aspect-ratio: 1;
  animation: fade-rise 1.4s 0.2s var(--ease-precise) both;
}

/* Observatory Instrument */
.instrument {
  position: relative;
  width: 100%;
  height: 100%;
}

.instrument__orbital {
  position: absolute;
  inset: -8%;
  border: 1px solid rgba(201, 130, 82, 0.28);
  border-radius: 50%;
  clip-path: inset(0 0 48% 48%);
  animation: orbital-draw 8s var(--ease-precise) infinite alternate;
}

.instrument__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(233, 231, 222, 0.14);
}

.instrument__ring--outer {
  inset: 0;
  background:
    conic-gradient(
      from 0deg,
      transparent 0deg 348deg,
      rgba(201, 130, 82, 0.55) 348deg 360deg
    );
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 1px));
  animation: spin-slow 48s linear infinite;
}

.instrument__ring--mid {
  inset: 10%;
  border-color: rgba(233, 231, 222, 0.18);
  background: radial-gradient(circle at 50% 50%, transparent 68%, rgba(17, 28, 36, 0.4) 100%);
}

.instrument__ring--inner {
  inset: 22%;
  border-color: rgba(201, 130, 82, 0.35);
  background: var(--deep-navy);
  box-shadow: inset 0 0 40px rgba(6, 9, 12, 0.55);
}

.instrument__ticks {
  position: absolute;
  inset: 4%;
  border-radius: 50%;
  background:
    repeating-conic-gradient(
      from 0deg,
      rgba(233, 231, 222, 0.45) 0deg 0.4deg,
      transparent 0.4deg 6deg
    );
  mask: radial-gradient(farthest-side, transparent 93%, #000 94%, #000 100%);
}

.instrument__face {
  position: absolute;
  inset: 22%;
  border-radius: 50%;
}

.instrument__num {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--soft-gray);
}

.instrument__num--n { top: 10%; left: 50%; transform: translateX(-50%); }
.instrument__num--e { right: 10%; top: 50%; transform: translateY(-50%); }
.instrument__num--s { bottom: 10%; left: 50%; transform: translateX(-50%); }
.instrument__num--w { left: 10%; top: 50%; transform: translateY(-50%); }

.instrument__hub {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14%;
  height: 14%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--pale-copper), var(--copper) 55%, var(--copper-deep));
  box-shadow: 0 0 0 4px rgba(17, 28, 36, 0.9);
}

.instrument__pointer {
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  animation: pointer-sweep 18s var(--ease-precise) infinite alternate;
}

.instrument__pointer::before {
  content: "";
  position: absolute;
  top: 8%;
  left: 50%;
  width: 1.5px;
  height: 38%;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, var(--pale-copper), transparent);
}

.instrument__indicator {
  position: absolute;
  top: 6%;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--copper);
  transform: translate(-50%, 0);
  box-shadow: 0 0 0 3px rgba(201, 130, 82, 0.15);
  animation: indicator-pulse 4s var(--ease-precise) infinite;
}

.instrument__details {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.instrument__details li {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--soft-gray);
  white-space: nowrap;
}

.instrument__details li:nth-child(1) { top: 8%; left: -8%; }
.instrument__details li:nth-child(2) { top: 8%; right: -4%; }
.instrument__details li:nth-child(3) { bottom: 10%; left: -4%; }
.instrument__details li:nth-child(4) { bottom: 10%; right: -2%; }

.hero__scroll {
  position: absolute;
  right: max(24px, calc((100% - min(1200px, calc(100% - 48px))) / 2));
  bottom: var(--space-4);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--soft-gray);
  transition: color 0.3s var(--ease-precise);
}

.hero__scroll:hover {
  color: var(--copper);
}

/* --------------------------------------------------------------------------
   3. Observation Statement
   -------------------------------------------------------------------------- */

.statement {
  background: var(--moon-white);
  color: var(--deep-black);
  padding: var(--space-8) 0;
}

.statement__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 8vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.055em;
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-4);
}

.statement__rule {
  width: 64px;
  height: 1px;
  background: var(--copper);
  margin-bottom: var(--space-4);
}

.statement__copy {
  max-width: 42ch;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--blue-gray);
}

/* --------------------------------------------------------------------------
   4. Precision Index
   -------------------------------------------------------------------------- */

.precision {
  background: var(--midnight);
  padding: var(--space-8) 0;
  position: relative;
}

.precision::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(233, 231, 222, 0.04) 1px, transparent 1px);
  background-size: calc(100% / 12) 100%;
  opacity: 0.4;
  pointer-events: none;
  mask-image: linear-gradient(to right, transparent, #000 20%, #000 80%, transparent);
}

.index-list {
  border-top: var(--border-fine);
  position: relative;
  z-index: 1;
}

.index-row {
  border-bottom: var(--border-fine);
}

.index-row__link {
  display: grid;
  grid-template-columns: 88px 1fr auto auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  position: relative;
  transition: padding-left 0.4s var(--ease-precise);
}

.index-row__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--copper);
  transform: translateY(-50%);
  transition: width 0.4s var(--ease-precise);
}

.index-row__num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.04em;
  color: var(--moon-white);
  transition: color 0.35s var(--ease-precise);
}

.index-row__title {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.index-row__desc {
  display: block;
  color: var(--soft-gray);
  font-size: 0.975rem;
  transition: transform 0.4s var(--ease-precise), color 0.35s var(--ease-precise);
}

.index-row__coord {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--soft-gray);
}

.index-row__arrow {
  font-size: 1.25rem;
  color: var(--soft-gray);
  transition: transform 0.4s var(--ease-precise), color 0.35s var(--ease-precise);
}

.index-row__link:hover {
  padding-left: var(--space-3);
}

.index-row__link:hover::before {
  width: 16px;
}

.index-row__link:hover .index-row__num {
  color: var(--copper);
}

.index-row__link:hover .index-row__desc {
  transform: translateX(6px);
  color: var(--moon-white);
}

.index-row__link:hover .index-row__arrow {
  transform: translateX(6px);
  color: var(--copper);
}

/* --------------------------------------------------------------------------
   5. Instrument Studies
   -------------------------------------------------------------------------- */

.studies {
  background:
    radial-gradient(circle at 15% 20%, rgba(201, 130, 82, 0.08), transparent 30%),
    var(--deep-navy);
  padding: var(--space-8) 0;
}

.studies__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.study__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--soft-gray);
  margin-bottom: var(--space-3);
}

.study__visual {
  aspect-ratio: 1;
  margin-bottom: var(--space-3);
  border-bottom: var(--border-fine);
  position: relative;
  overflow: hidden;
}

.study__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-1);
}

.study__copy {
  color: var(--soft-gray);
  font-size: 0.95rem;
  max-width: 32ch;
}

/* Study 01 — Focus Lens */
.lens {
  position: absolute;
  inset: 12%;
}

.lens__outer,
.lens__mid,
.lens__core {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(233, 231, 222, 0.18);
}

.lens__outer {
  inset: 0;
  background: radial-gradient(circle at 40% 35%, rgba(233, 231, 222, 0.06), transparent 55%);
}

.lens__mid {
  inset: 18%;
  border-color: rgba(201, 130, 82, 0.35);
}

.lens__core {
  inset: 38%;
  background: radial-gradient(circle at 45% 40%, rgba(226, 178, 143, 0.35), transparent 60%);
  border-color: rgba(233, 231, 222, 0.25);
}

.lens__flare {
  position: absolute;
  inset: 46%;
  border-radius: 50%;
  background: var(--copper-gradient);
  opacity: 0.85;
  animation: indicator-pulse 5s var(--ease-precise) infinite;
}

.lens__cross {
  position: absolute;
  background: rgba(233, 231, 222, 0.2);
}

.lens__cross--h {
  top: 50%;
  left: 8%;
  right: 8%;
  height: 1px;
  transform: translateY(-50%);
}

.lens__cross--v {
  left: 50%;
  top: 8%;
  bottom: 8%;
  width: 1px;
  transform: translateX(-50%);
}

/* Study 02 — Measure Grid */
.measure-grid {
  position: absolute;
  inset: 16%;
}

.measure-grid__field {
  position: absolute;
  inset: 0;
  border: var(--border-fine);
  background-image:
    linear-gradient(rgba(233, 231, 222, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 231, 222, 0.08) 1px, transparent 1px);
  background-size: 12.5% 12.5%;
}

.measure-grid__label {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.1em;
  color: var(--soft-gray);
}

.measure-grid__label--tl { top: -18px; left: 0; }
.measure-grid__label--tr { top: -18px; right: 0; }
.measure-grid__label--bl { bottom: -18px; left: 0; }
.measure-grid__label--br { bottom: -18px; right: 0; }

.measure-grid__target {
  position: absolute;
  top: 37.5%;
  left: 50%;
  width: 12.5%;
  height: 12.5%;
  border: 1px solid var(--border-copper);
  background: rgba(201, 130, 82, 0.12);
  transform: translateX(-50%);
}

/* Study 03 — Orbit */
.orbit-study {
  position: absolute;
  inset: 10%;
}

.orbit-study__ellipse {
  position: absolute;
  border: 1px solid rgba(233, 231, 222, 0.18);
  border-radius: 50%;
}

.orbit-study__ellipse--a {
  inset: 8% 2%;
  transform: rotate(-18deg);
}

.orbit-study__ellipse--b {
  inset: 18% 10%;
  transform: rotate(28deg);
  border-color: rgba(201, 130, 82, 0.4);
}

.orbit-study__ellipse--c {
  inset: 30% 22%;
  transform: rotate(-8deg);
}

.orbit-study__track {
  position: absolute;
  inset: 18% 10%;
  animation: spin-slow 12s linear infinite;
}

.orbit-study__point {
  position: absolute;
  top: 0;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--copper);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 4px rgba(201, 130, 82, 0.12);
}

/* --------------------------------------------------------------------------
   6. Orbital Gallery
   -------------------------------------------------------------------------- */

.gallery {
  background: var(--midnight);
  padding: var(--space-8) 0 var(--space-7);
  overflow: hidden;
}

.gallery .container {
  margin-bottom: var(--space-4);
}

.gallery__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(260px, 22vw);
  gap: var(--space-3);
  overflow-x: auto;
  padding: 0 max(24px, calc((100% - min(1200px, calc(100% - 48px))) / 2)) var(--space-3);
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--blue-gray) transparent;
}

.observation {
  scroll-snap-align: start;
  border-top: var(--border-fine);
  padding-top: var(--space-3);
}

.observation__visual {
  aspect-ratio: 4 / 5;
  margin-bottom: var(--space-3);
  border: var(--border-fine);
  position: relative;
  overflow: hidden;
  background: var(--deep-navy);
}

.observation__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--soft-gray);
  margin-bottom: var(--space-1);
}

.observation__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.375rem;
  letter-spacing: -0.02em;
}

/* Gallery geometries */
.geo-night,
.geo-form,
.geo-signal,
.geo-distance,
.geo-trace {
  position: absolute;
  inset: 0;
}

.geo-night__disk {
  position: absolute;
  width: 58%;
  aspect-ratio: 1;
  border-radius: 50%;
  top: 22%;
  left: 18%;
  background: radial-gradient(circle at 35% 35%, #26343D, #06090C 70%);
  border: 1px solid rgba(233, 231, 222, 0.12);
}

.geo-night__ring {
  position: absolute;
  width: 72%;
  aspect-ratio: 1;
  border-radius: 50%;
  top: 15%;
  left: 11%;
  border: 1px solid rgba(201, 130, 82, 0.35);
  clip-path: inset(0 0 0 48%);
}

.geo-form__arc {
  position: absolute;
  width: 90%;
  aspect-ratio: 1;
  border-radius: 50%;
  top: 20%;
  left: 5%;
  border: 1px solid rgba(233, 231, 222, 0.2);
  clip-path: inset(0 0 50% 0);
}

.geo-form__block {
  position: absolute;
  width: 42%;
  height: 28%;
  bottom: 18%;
  right: 14%;
  border: 1px solid rgba(201, 130, 82, 0.5);
  background: linear-gradient(160deg, rgba(201, 130, 82, 0.15), transparent);
}

.geo-signal__cross-h,
.geo-signal__cross-v {
  position: absolute;
  background: rgba(233, 231, 222, 0.22);
}

.geo-signal__cross-h {
  top: 50%;
  left: 12%;
  right: 12%;
  height: 1px;
}

.geo-signal__cross-v {
  left: 50%;
  top: 12%;
  bottom: 12%;
  width: 1px;
}

.geo-signal__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--copper);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 18px rgba(201, 130, 82, 0.08);
}

.geo-distance__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(233, 231, 222, 0.16);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.geo-distance__ring--1 { width: 30%; aspect-ratio: 1; }
.geo-distance__ring--2 { width: 55%; aspect-ratio: 1; border-color: rgba(201, 130, 82, 0.35); }
.geo-distance__ring--3 { width: 80%; aspect-ratio: 1; }

.geo-trace__path {
  position: absolute;
  inset: 18%;
  border: 1px solid rgba(233, 231, 222, 0.18);
  border-radius: 50%;
  transform: rotateX(62deg) rotateZ(-20deg);
}

.geo-trace__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 7px;
  height: 7px;
  margin: -3.5px;
  border-radius: 50%;
  background: var(--copper);
  animation: trace-orbit 10s linear infinite;
}

/* --------------------------------------------------------------------------
   7. Deep Field
   -------------------------------------------------------------------------- */

.deep-field {
  position: relative;
  min-height: 90vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 50%, rgba(38, 52, 61, 0.35), transparent 45%),
    var(--deep-black);
  overflow: hidden;
  padding: var(--space-8) var(--space-3);
}

.deep-field__rings {
  position: absolute;
  width: min(720px, 88vw);
  aspect-ratio: 1;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.deep-field__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(233, 231, 222, 0.1);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.deep-field__ring--1 { width: 100%; height: 100%; }
.deep-field__ring--2 { width: 78%; height: 78%; border-color: rgba(233, 231, 222, 0.08); }
.deep-field__ring--3 { width: 56%; height: 56%; border-color: rgba(201, 130, 82, 0.22); }

.deep-field__orbit {
  position: absolute;
  inset: 0;
  animation: spin-slow 36s linear infinite;
}

.deep-field__point {
  position: absolute;
  top: 0;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--copper);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 6px rgba(201, 130, 82, 0.12);
}

.deep-field__mark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--soft-gray);
}

.deep-field__content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.deep-field__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4rem, 12vw, 9rem);
  line-height: 0.88;
  letter-spacing: -0.06em;
  display: flex;
  flex-direction: column;
  color: var(--moon-white);
}

/* --------------------------------------------------------------------------
   8. Archive
   -------------------------------------------------------------------------- */

.archive {
  background: var(--midnight);
  padding: var(--space-8) 0;
}

.archive .section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: 0.02em;
}

.archive-list {
  border-top: var(--border-fine);
}

.archive-list > li {
  border-bottom: var(--border-fine);
}

.archive-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  position: relative;
  font-family: var(--font-mono);
  font-size: clamp(0.8125rem, 1.5vw, 1rem);
  letter-spacing: 0.08em;
  transition: transform 0.4s var(--ease-precise);
}

.archive-row__line {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--copper);
  transition: width 0.5s var(--ease-precise);
}

.archive-row__text {
  transition: color 0.35s var(--ease-precise);
}

.archive-row__view {
  color: var(--soft-gray);
  white-space: nowrap;
  transition: transform 0.4s var(--ease-precise), color 0.35s var(--ease-precise);
}

.archive-row:hover {
  transform: translateX(6px);
}

.archive-row:hover .archive-row__line {
  width: 100%;
}

.archive-row:hover .archive-row__text {
  color: var(--copper);
}

.archive-row:hover .archive-row__view {
  color: var(--copper);
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   9. Final Observation
   -------------------------------------------------------------------------- */

.final {
  position: relative;
  background: var(--moon-white);
  color: var(--deep-black);
  padding: var(--space-8) 0;
  overflow: hidden;
}

.final__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.final__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 9vw, 7.5rem);
  line-height: 0.9;
  letter-spacing: -0.055em;
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-4);
}

.final__copy {
  max-width: 40ch;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--blue-gray);
  margin-bottom: var(--space-5);
}

.final__instrument {
  position: absolute;
  width: min(520px, 70vw);
  aspect-ratio: 1;
  right: -12%;
  bottom: -28%;
  opacity: 0.9;
  pointer-events: none;
}

.final-dial {
  position: relative;
  width: 100%;
  height: 100%;
}

.final-dial__ring,
.final-dial__inner {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(17, 28, 36, 0.18);
}

.final-dial__ring {
  inset: 0;
  background:
    conic-gradient(
      from 220deg,
      transparent 0deg 340deg,
      rgba(201, 130, 82, 0.4) 340deg 360deg
    );
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 1px));
  animation: spin-slow 60s linear infinite;
}

.final-dial__inner {
  inset: 18%;
  border-color: rgba(201, 130, 82, 0.35);
}

.final-dial__hub {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12%;
  height: 12%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: var(--copper-gradient);
}

/* --------------------------------------------------------------------------
   10. Footer
   -------------------------------------------------------------------------- */

.footer {
  background: var(--deep-navy);
  padding: var(--space-7) 0 var(--space-4);
  border-top: var(--border-fine);
}

.footer__inner {
  display: grid;
  gap: var(--space-6);
}

.footer__name {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.footer__marker {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--copper);
  align-self: center;
  margin-right: 4px;
}

.footer__tld {
  font-size: 0.35em;
  font-weight: 500;
  color: var(--soft-gray);
  letter-spacing: 0.08em;
}

.footer__tagline {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--soft-gray);
  font-style: italic;
}

.footer__columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  max-width: 640px;
}

.footer__heading {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--soft-gray);
  margin-bottom: var(--space-2);
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer__col a {
  font-size: 0.95rem;
  color: var(--moon-white);
  transition: color 0.3s var(--ease-precise);
}

.footer__col a:hover {
  color: var(--copper);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: var(--border-fine);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--soft-gray);
}

.footer__reg {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--copper);
  position: relative;
}

.footer__reg::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--copper);
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */

@keyframes fade-rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin-slow {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pointer-sweep {
  0% { transform: rotate(-18deg); }
  100% { transform: rotate(42deg); }
}

@keyframes indicator-pulse {
  0%, 100% { opacity: 0.75; transform: translate(-50%, 0) scale(1); }
  50% { opacity: 1; transform: translate(-50%, 0) scale(1.08); }
}

@keyframes orbital-draw {
  from { opacity: 0.35; }
  to { opacity: 0.85; }
}

@keyframes trace-orbit {
  0% { transform: rotate(0deg) translateX(70px); }
  100% { transform: rotate(360deg) translateX(70px); }
}

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

@media (max-width: 1100px) {
  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .hero__meta {
    grid-column: 1 / -1;
  }

  .hero__content {
    grid-column: 1;
    margin-top: 0;
  }

  .hero__instrument {
    grid-column: 2;
    width: min(360px, 100%);
  }

  .instrument__details li:nth-child(1),
  .instrument__details li:nth-child(2) {
    position: static;
    display: inline-block;
    margin-right: var(--space-2);
  }

  .instrument__details {
    position: absolute;
    inset: auto 0 -40px 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-2);
  }

  .instrument__details li:nth-child(3),
  .instrument__details li:nth-child(4) {
    position: static;
  }

  .studies__grid {
    grid-template-columns: 1fr 1fr;
  }

  .study--orbit {
    grid-column: 1 / -1;
    max-width: 420px;
  }
}

@media (max-width: 768px) {
  :root {
    --container: min(1200px, calc(100% - 40px));
    --nav-height: 56px;
  }

  .nav {
    grid-template-columns: 1fr auto auto;
  }

  .nav__center,
  .nav__action {
    display: none;
  }

  .nav__mobile-code {
    display: block;
  }

  .nav__menu {
    display: block;
  }

  .hero {
    min-height: auto;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    padding: var(--space-5) 0 var(--space-7);
  }

  .hero__content,
  .hero__instrument,
  .hero__meta {
    grid-column: 1;
  }

  .hero__instrument {
    width: min(300px, 86vw);
    justify-self: center;
    margin-top: var(--space-6);
  }

  .instrument__details {
    justify-content: center;
    inset: auto 0 -48px 0;
  }

  .hero__scroll {
    position: static;
    display: inline-flex;
    margin: var(--space-6) auto 0;
    width: fit-content;
    align-self: center;
  }

  .hero__inner {
    padding-bottom: calc(var(--space-7) + 24px);
  }

  .index-row__link {
    grid-template-columns: 56px 1fr auto;
    gap: var(--space-2);
  }

  .index-row__coord {
    display: none;
  }

  .studies__grid {
    grid-template-columns: 1fr;
  }

  .study--orbit {
    max-width: none;
  }

  .gallery__track {
    grid-auto-columns: minmax(240px, 78vw);
  }

  .footer__columns {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .final__instrument {
    opacity: 0.45;
    right: -30%;
    bottom: -35%;
  }
}

@media (max-width: 480px) {
  :root {
    --container: min(1200px, calc(100% - 40px));
  }

  .hero__title {
    font-size: clamp(3.25rem, 18vw, 4.5rem);
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .instrument__ticks {
    opacity: 0.55;
  }

  .instrument__num {
    display: none;
  }

  .archive-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}