/* ==========================================================================
   SKYORA — Design System
   ========================================================================== */

:root {
  /* Color */
  --bg: #07090D;
  --bg-alt: #0B0F14;
  --surface: #10151C;
  --surface-raised: #141A22;
  --border: rgba(237, 234, 227, 0.09);
  --border-strong: rgba(237, 234, 227, 0.16);

  --text-primary: #EDEAE3;
  --text-secondary: #8B93A1;
  --text-tertiary: #5C6470;

  --accent: #38BDF8;
  --accent-soft: #7DD3FC;
  --accent-dim: rgba(56, 189, 248, 0.14);
  --accent-glow: rgba(56, 189, 248, 0.22);
  --silver: #C9C5D9;

  /* Type */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Spacing */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 7rem;
  --space-8: 10rem;

  /* Layout */
  --container: 1240px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 180ms;
  --dur-med: 420ms;
  --dur-slow: 800ms;
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; background: none; border: none; color: inherit; }
ul { list-style: none; }

::selection { background: var(--accent-dim); color: var(--accent-soft); }

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-soft);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}

.eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px 1px var(--accent-glow);
}

.eyebrow.plain::before { display: none; }

section { position: relative; }

.section-pad { padding: var(--space-7) 0; }
@media (max-width: 720px) {
  .section-pad { padding: var(--space-6) 0; }
}

h1, h2, h3, h4 {
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--text-primary);
}

h2.section-title {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  max-width: 720px;
  margin-bottom: var(--space-4);
}

p.lede {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 560px;
  line-height: 1.7;
}

.divider {
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, var(--border) 0%, var(--border) 60%, transparent 100%);
}

.grid-tick-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

.tick-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  padding: 0.35em 0.7em;
  border-radius: var(--radius-sm);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-size: 0.92rem;
  font-weight: 560;
  padding: 0.9em 1.5em;
  border-radius: 999px;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg);
}
.btn-primary:hover { transform: translateY(-1px); background: #fff; }

.btn-outline {
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent-soft); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  color: var(--accent-soft);
  font-size: 0.92rem;
  font-weight: 550;
  position: relative;
}
.link-arrow .arrow { transition: transform var(--dur-fast) var(--ease); display: inline-block; }
.link-arrow:hover .arrow { transform: translate(3px, -3px); }
.link-arrow::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 100%; height: 1px;
  background: var(--accent-soft);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease);
}
.link-arrow:hover::after { transform: scaleX(1); }

/* ---------- Navigation ---------- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.15rem 0;
  transition: background var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease), padding var(--dur-med) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-nav.scrolled {
  background: rgba(7, 9, 13, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
  padding: 0.85rem 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.nav-brand { display: flex; align-items: baseline; gap: 0.7rem; }
.nav-brand .mark {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}
.nav-brand .descriptor {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  text-transform: uppercase;
}
@media (max-width: 620px) { .nav-brand .descriptor { display: none; } }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.nav-links a:not(.btn) {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--dur-fast) var(--ease);
}
.nav-links a:not(.btn):hover { color: var(--text-primary); }
.nav-links a.active { color: var(--text-primary); }

.nav-cta { display: flex; align-items: center; gap: var(--space-3); }
.nav-menu-btn {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}
.nav-menu-btn span, .nav-menu-btn::before, .nav-menu-btn::after { display: none; }
.nav-menu-btn svg { width: 18px; height: 18px; }

@media (max-width: 860px) {
  .nav-links-desktop { display: none; }
  .nav-menu-btn { display: flex; }
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  padding: 6.5rem var(--space-4) var(--space-4);
  gap: var(--space-2);
  transform: translateY(-100%);
  transition: transform var(--dur-med) var(--ease);
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu a {
  font-size: 1.4rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}
.mobile-menu .btn { margin-top: var(--space-3); align-self: flex-start; }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 6.5rem;
  padding-bottom: var(--space-5);
  background:
    radial-gradient(ellipse 900px 500px at 15% 10%, rgba(56,189,248,0.05), transparent 60%),
    var(--bg);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-6);
  align-items: center;
  width: 100%;
}

.hero-copy .status-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4em 0.9em;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  margin-bottom: var(--space-3);
}
.hero-copy .status-tag .dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5vw, 3.9rem);
  max-width: 12ch;
  opacity: 0;
  transform: translateY(14px);
  animation: heroRise var(--dur-slow) var(--ease) 0.15s forwards;
}

.hero-copy .sub {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 1.08rem;
  max-width: 46ch;
  line-height: 1.7;
  opacity: 0;
  transform: translateY(14px);
  animation: heroRise var(--dur-slow) var(--ease) 0.32s forwards;
}

.hero-actions {
  margin-top: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(14px);
  animation: heroRise var(--dur-slow) var(--ease) 0.46s forwards;
}

@keyframes heroRise {
  to { opacity: 1; transform: translateY(0); }
}

.hero-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  border: 1px solid var(--border);
  background: var(--surface);
  opacity: 0;
  animation: heroFade 1s var(--ease) 0.1s forwards;
}
@keyframes heroFade { to { opacity: 1; } }

.hero-visual img {
  width: 100%; height: 100%; object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.hero-annotations {
  position: absolute; inset: 0;
  pointer-events: none;
}
.hero-annotations .tag {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--accent-soft);
  background: rgba(7,9,13,0.55);
  border: 1px solid rgba(125,211,252,0.22);
  padding: 0.35em 0.65em;
  border-radius: 3px;
  opacity: 0;
  transform: translateY(6px);
  animation: tagIn var(--dur-med) var(--ease) forwards;
}
@keyframes tagIn { to { opacity: 1; transform: translateY(0); } }
.hero-annotations .tag:nth-child(1) { top: 8%; left: 6%; animation-delay: 0.7s; }
.hero-annotations .tag:nth-child(2) { top: 8%; right: 6%; animation-delay: 0.85s; }
.hero-annotations .tag:nth-child(3) { bottom: 8%; left: 6%; animation-delay: 1s; }
.hero-annotations .tag:nth-child(4) { bottom: 8%; right: 6%; animation-delay: 1.15s; }

.hero-annotations .crosshair {
  position: absolute;
  top: 50%; left: 50%;
  width: 30%; height: 30%;
  border: 1px solid rgba(125,211,252,0.28);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  opacity: 0;
  animation: crosshairIn 1s var(--ease) 1.3s forwards;
}
@keyframes crosshairIn { to { opacity: 1; transform: translate(-50%, -50%) scale(1); } }

.hero-scroll-cue {
  margin-top: var(--space-5);
}

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; aspect-ratio: 4/3; }
  .hero { padding-top: 5.5rem; }
}

/* ---------- Intro (two column editorial) ---------- */
.intro-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-6);
  align-items: start;
}
.intro-grid .statement {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.28;
}
.intro-grid .statement .accent { color: var(--accent-soft); }
.intro-side p { color: var(--text-secondary); margin-bottom: var(--space-3); }
.intro-side .highlight {
  font-size: 1.1rem;
  color: var(--text-primary);
  border-left: 2px solid var(--accent);
  padding-left: var(--space-2);
  margin-bottom: var(--space-3);
}
.tick-tags {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
  margin-top: var(--space-3);
}
.tick-tags span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  padding: 0.4em 0.75em;
  border-radius: 3px;
}
@media (max-width: 860px) { .intro-grid { grid-template-columns: 1fr; } }

/* ---------- Capability cards ---------- */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.capability-card {
  background: var(--surface);
  padding: var(--space-4);
  transition: background var(--dur-fast) var(--ease);
}
.capability-card:hover { background: var(--surface-raised); }
.capability-card .idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-soft);
  margin-bottom: var(--space-3);
  display: block;
}
.capability-card h3 {
  font-size: 1.18rem;
  margin-bottom: var(--space-2);
}
.capability-card p { color: var(--text-secondary); font-size: 0.94rem; }
.capability-card ul { margin-top: var(--space-2); }
.capability-card ul li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  padding: 0.3em 0;
  border-top: 1px dashed var(--border);
}
.capability-card ul li:first-child { border-top: none; }

@media (max-width: 860px) {
  .capability-grid { grid-template-columns: 1fr; }
}

/* ---------- Comparison slider ---------- */
.compare-wrap { margin-top: var(--space-5); }
.compare {
  position: relative;
  width: 100%;
  aspect-ratio: 16/10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-strong);
  cursor: ew-resize;
  user-select: none;
  background: var(--surface);
}
.compare img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  pointer-events: none;
}
.compare .after-layer { z-index: 1; }
.compare .before-layer {
  z-index: 2;
  clip-path: inset(0 50% 0 0);
}
.compare .divider-line {
  position: absolute; top: 0; bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--accent-soft);
  box-shadow: 0 0 14px var(--accent-glow);
  z-index: 3;
  transform: translateX(-1px);
}
.compare .handle {
  position: absolute;
  top: 50%; left: 50%;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(7,9,13,0.75);
  border: 1px solid var(--accent-soft);
  transform: translate(-50%, -50%);
  z-index: 4;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(6px);
}
.compare .handle svg { width: 16px; height: 16px; color: var(--accent-soft); }
.compare .tag {
  position: absolute;
  top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  background: rgba(7,9,13,0.6);
  border: 1px solid var(--border-strong);
  padding: 0.35em 0.7em;
  border-radius: 3px;
  z-index: 5;
}
.compare .tag.tag-left { left: 1rem; }
.compare .tag.tag-right { right: 1rem; }
.compare-caption {
  margin-top: var(--space-2);
  color: var(--text-tertiary);
  font-size: 0.85rem;
  max-width: 640px;
}

@media (max-width: 720px) {
  .compare { aspect-ratio: 4/5; }
}

/* ---------- Examples grid ---------- */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.example-item { position: relative; border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border); }
.example-item img { aspect-ratio: 4/5; object-fit: cover; transition: transform 700ms var(--ease); }
.example-item:hover img { transform: scale(1.035); }
.example-caption {
  padding: var(--space-2) 0 0;
}
.example-caption .l1 {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--accent-soft);
  display: block;
  margin-bottom: 0.3em;
}
.example-caption .l2 { color: var(--text-secondary); font-size: 0.88rem; }

@media (max-width: 860px) {
  .examples-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .examples-grid { grid-template-columns: 1fr; }
}

/* ---------- Pipeline diagram ---------- */
.pipeline {
  margin-top: var(--space-5);
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}
.pipeline-stage {
  flex: 1 0 150px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-2);
  position: relative;
  transition: border-color var(--dur-med) var(--ease), background var(--dur-med) var(--ease), transform var(--dur-med) var(--ease);
}
.pipeline-stage.active {
  border-color: var(--accent);
  background: var(--surface-raised);
  transform: translateY(-3px);
}
.pipeline-stage .n {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  margin-bottom: 0.6rem;
  display: block;
}
.pipeline-stage.active .n { color: var(--accent-soft); }
.pipeline-stage .label {
  font-size: 0.86rem;
  font-weight: 560;
}
.pipeline-connector {
  display: flex; align-items: center; justify-content: center;
  color: var(--text-tertiary);
  flex: 0 0 22px;
  font-family: var(--font-mono);
}

@media (max-width: 860px) {
  .pipeline { flex-direction: column; overflow-x: visible; }
  .pipeline-connector { transform: rotate(90deg); flex: 0 0 22px; }
}

/* ---------- Equations ---------- */
.equation-list { display: flex; flex-direction: column; gap: var(--space-4); margin-top: var(--space-5); }
.equation-block {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
}
.equation-block:first-child { border-top: none; padding-top: 0; }
.equation-block h4 {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 560;
}
.equation-display {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  color: var(--accent-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  display: inline-block;
  margin-bottom: var(--space-2);
  letter-spacing: 0.01em;
}
.equation-display sub { font-size: 0.65em; }
.equation-block p { color: var(--text-secondary); font-size: 0.92rem; max-width: 60ch; }

@media (max-width: 720px) {
  .equation-block { grid-template-columns: 1fr; gap: var(--space-2); }
  .equation-display { font-size: 1.05rem; }
}

/* ---------- Paper card ---------- */
.paper-card {
  margin-top: var(--space-5);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  background: linear-gradient(135deg, var(--surface) 0%, var(--bg-alt) 100%);
  position: relative;
  overflow: hidden;
}
.paper-card::before {
  content: '';
  position: absolute;
  top: -40%; right: -10%;
  width: 60%; height: 180%;
  background: radial-gradient(circle, var(--accent-dim), transparent 65%);
  pointer-events: none;
}
.paper-card .eyebrow { margin-bottom: var(--space-3); }
.paper-card h3 {
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  max-width: 32ch;
  margin-bottom: var(--space-3);
}
.paper-meta {
  display: flex; flex-wrap: wrap; gap: var(--space-4);
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.paper-meta strong { color: var(--text-primary); font-weight: 560; }
.paper-doi {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  margin-top: var(--space-3);
}
.paper-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-4); }

/* ---------- About / Credit ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-5);
}
.researcher-card h3 { font-size: 1.4rem; margin-bottom: 0.3rem; }
.researcher-card .role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent-soft);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  display: block;
}
.researcher-card p { color: var(--text-secondary); max-width: 52ch; }

.org-list { display: flex; flex-direction: column; gap: var(--space-4); }
.org-item { border-top: 1px solid var(--border); padding-top: var(--space-3); }
.org-item:first-child { border-top: none; padding-top: 0; }
.org-item h4 { font-size: 1.02rem; margin-bottom: 0.35rem; }
.org-item p { color: var(--text-secondary); font-size: 0.9rem; }

@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; gap: var(--space-4); } }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0 var(--space-4);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: var(--space-5);
  flex-wrap: wrap;
  padding-bottom: var(--space-5);
}
.footer-brand .mark { font-weight: 700; font-size: 1.1rem; margin-bottom: 0.5rem; }
.footer-brand p { color: var(--text-tertiary); font-size: 0.88rem; max-width: 34ch; }
.footer-links { display: flex; gap: var(--space-6); flex-wrap: wrap; }
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 0.3em 0;
  transition: color var(--dur-fast) var(--ease);
}
.footer-col a:hover { color: var(--accent-soft); }
.footer-bottom {
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
  color: var(--text-tertiary);
  font-size: 0.82rem;
}
.footer-bottom .credit strong { color: var(--text-secondary); font-weight: 550; }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal-stagger > * { transition-delay: calc(var(--i, 0) * 70ms); }

/* ---------- Page hero (sub-pages) ---------- */
.page-hero {
  padding: 9rem 0 var(--space-6);
  border-bottom: 1px solid var(--border);
}
.page-hero .eyebrow { margin-bottom: var(--space-3); }
.page-hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.2rem);
  max-width: 16ch;
}
.page-hero .sub {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 56ch;
}

/* ---------- Moon fixer stages ---------- */
.fixer-stages {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-5);
}
.fixer-stage {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface);
}
.fixer-stage img { aspect-ratio: 1/1; object-fit: cover; }
.fixer-stage .meta { padding: var(--space-2); }
.fixer-stage .meta .n { font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent-soft); display:block; margin-bottom: 0.3em; }
.fixer-stage .meta .t { font-size: 0.85rem; font-weight: 550; }

@media (max-width: 940px) {
  .fixer-stages { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 620px) {
  .fixer-stages { grid-template-columns: repeat(2, 1fr); }
}

.stage-detail-list { margin-top: var(--space-6); display: flex; flex-direction: column; }
.stage-detail {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
}
.stage-detail:first-child { border-top: none; }
.stage-detail .num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-soft);
}
.stage-detail h4 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.stage-detail p { color: var(--text-secondary); font-size: 0.92rem; max-width: 62ch; }

@media (max-width: 620px) {
  .stage-detail { grid-template-columns: 1fr; gap: 0.4rem; }
}

/* ---------- Accordion (methodology) ---------- */
.accordion { margin-top: var(--space-5); border-top: 1px solid var(--border); }
.accordion-item { border-bottom: 1px solid var(--border); }
.accordion-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 560;
}
.accordion-header .plus {
  width: 22px; height: 22px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  position: relative;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.accordion-header .plus::before, .accordion-header .plus::after {
  content: '';
  position: absolute;
  background: var(--text-secondary);
}
.accordion-header .plus::before { width: 9px; height: 1px; }
.accordion-header .plus::after { width: 1px; height: 9px; }
.accordion-item.open .accordion-header .plus { transform: rotate(45deg); border-color: var(--accent); }
.accordion-item.open .accordion-header .plus::before,
.accordion-item.open .accordion-header .plus::after { background: var(--accent-soft); }

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-med) var(--ease);
}
.accordion-panel-inner { padding: 0 0 var(--space-4); color: var(--text-secondary); font-size: 0.94rem; }
.accordion-panel-inner ul { margin-top: 0.6rem; }
.accordion-panel-inner li {
  padding: 0.35em 0;
  padding-left: 1.1em;
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-tertiary);
}
.accordion-panel-inner li::before {
  content: '\2014';
  position: absolute; left: 0; color: var(--text-tertiary);
}

/* ---------- Benchmarks ---------- */
.benchmark-block { margin-top: var(--space-5); }
.benchmark-title { font-size: 1rem; font-weight: 600; margin-bottom: var(--space-3); }
.bar-chart { display: flex; flex-direction: column; gap: 0.85rem; margin-bottom: var(--space-5); }
.bar-row { display: grid; grid-template-columns: 140px 1fr 90px; align-items: center; gap: var(--space-2); }
.bar-row .name { font-size: 0.86rem; color: var(--text-secondary); }
.bar-track {
  height: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-soft) 100%);
  width: 0%;
  transition: width 1.1s var(--ease);
  border-radius: 999px;
}
.bar-fill.dim { background: var(--text-tertiary); opacity: 0.5; }
.bar-row .val { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-primary); text-align: right; }

.benchmark-note {
  margin-top: var(--space-3);
  font-size: 0.85rem;
  color: var(--text-tertiary);
  border-left: 2px solid var(--border-strong);
  padding-left: var(--space-2);
  max-width: 70ch;
}

/* ---------- Limitations / Future work ---------- */
.list-block { margin-top: var(--space-5); display: flex; flex-direction: column; }
.list-row {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--border);
}
.list-row:first-child { border-top: none; }
.list-row .marker { color: var(--accent-soft); font-family: var(--font-mono); font-size: 0.85rem; }
.list-row p { color: var(--text-secondary); font-size: 0.94rem; }

.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.roadmap-item {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}
.roadmap-item p { font-size: 0.9rem; color: var(--text-secondary); }
@media (max-width: 860px) { .roadmap-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .roadmap-grid { grid-template-columns: 1fr; } }

/* ---------- Credits & citations ---------- */
.citation-list {
  max-width: 820px;
  margin: var(--space-5) 0 0;
  padding-left: 2.2rem;
}
.citation-list li {
  padding: var(--space-3) 0 var(--space-3) var(--space-2);
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.7;
}
.citation-list li::marker {
  color: var(--accent-soft);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.citation-list li:first-child { border-top: none; }
.citation-list em { color: var(--text-primary); }
.citation-list a { overflow-wrap: anywhere; }

/* ---------- Abstract ---------- */
.abstract-block { max-width: 780px; margin-top: var(--space-5); }
.abstract-open {
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}
.abstract-block p { color: var(--text-secondary); margin-bottom: var(--space-3); line-height: 1.75; }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-6 { margin-top: var(--space-6); }
.small-caps {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}