/* ═══════════════════════════════════════════════════════
   SatScenes — style.css
   ═══════════════════════════════════════════════════════ */

/* ── Custom properties ──────────────────────────────── */
:root {
  --color-bg:          #000000;
  --color-bg-alt:      #0d0d0d;
  --color-card:        #111111;
  --color-gold:        #ebca66;
  --color-gold-30:     rgba(235, 202, 102, 0.30);
  --color-text:        #e0e0e0;
  --color-muted:       #888888;
  --color-white:       #ffffff;

  --font-sans:  'Space Grotesk', sans-serif;
  --font-mono:  'Space Mono', monospace;

  --max-width: 1100px;
  --section-padding: 100px 24px;
  --navbar-height: 64px;

  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

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

/* ── Typography helpers ─────────────────────────────── */
h1, h2, h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.15;
}

h1 { font-size: clamp(3rem, 8vw, 6rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: 1.125rem; }

p { margin-bottom: 1.1em; }
p:last-child { margin-bottom: 0; }

/* ── Container ──────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Section base ───────────────────────────────────── */
.section {
  padding: var(--section-padding);
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  color: var(--color-white);
  margin-bottom: 12px;
}

.section-subheadline {
  color: var(--color-muted);
  font-size: 1.05rem;
}

/* ── Fade-in on scroll ──────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════════════════════════════════════════════════════
   NAVBAR
   ═══════════════════════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 900;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}

.navbar.scrolled {
  background: var(--color-bg);
  border-bottom-color: var(--color-gold);
}

.navbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-gold);
  letter-spacing: 0.02em;
}

.navbar-links {
  display: flex;
  gap: 36px;
}

.navbar-links a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--color-text);
  transition: color var(--transition);
  position: relative;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.navbar-links a:hover {
  color: var(--color-gold);
}

.navbar-links a:hover::after {
  width: 100%;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gold);
  border-radius: 2px;
  transition: var(--transition);
}

/* Mobile overlay menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 950;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.mobile-link {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  transition: color var(--transition);
}

.mobile-link:hover {
  color: var(--color-gold);
}

.mobile-menu-close {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 2rem;
  color: var(--color-gold);
  line-height: 1;
}

/* ═══════════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════════ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;

  /* CSS star-field fallback (active when hero.jpg is absent) */
  background-color: #0a0a0a;
  background-image: url('images/hero.jpg');
  background-size: cover;
  background-position: center;
}

/* Star-field via box-shadow — shown via pseudo-element */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.8) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 40%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 40% 10%, rgba(255,255,255,0.9) 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 70%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 30%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 80% 55%, rgba(255,255,255,0.8) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 20%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 15% 80%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 35% 65%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 85%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 45% 50%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 75% 75%, rgba(255,255,255,0.8) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 5% 55%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 95% 90%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 20% 25%, rgba(255,255,255,0.9) 0%, transparent 100%),
    radial-gradient(1px 1px at 50% 95%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 88% 8%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 3% 92%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 65% 48%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 5%, rgba(255,255,255,0.8) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  padding: 0 24px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 20px;
}

.hero-content h1 {
  color: var(--color-white);
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.65;
}

/* CTA button */
.btn-cta {
  display: inline-block;
  padding: 14px 32px;
  border: 1px solid var(--color-gold);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  background: transparent;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.btn-cta:hover {
  background: var(--color-gold);
  color: var(--color-bg);
}

/* Scroll chevron */
.hero-chevron {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: chevronBounce 2s ease-in-out infinite;
}

@keyframes chevronBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ═══════════════════════════════════════════════════════
   PIPELINE
   ═══════════════════════════════════════════════════════ */
.pipeline-body {
  max-width: 820px;
  margin: 0 auto 60px;
  color: var(--color-text);
  font-size: 1rem;
}

/* Three-step flow */
.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 48px;
  counter-reset: steps;
}

.pipeline-step {
  background: var(--color-card);
  border: 1px solid var(--color-gold-30);
  padding: 32px 28px;
  position: relative;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-gold);
  display: block;
  margin-bottom: 16px;
  line-height: 1;
}

.pipeline-step h3 {
  color: var(--color-white);
  margin-bottom: 8px;
}

.step-filename {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-gold);
  display: block;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
  word-break: break-all;
}

.pipeline-step p {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* Comparison note */
.comparison-note {
  border-left: 2px solid var(--color-gold);
  padding: 12px 20px;
  max-width: 720px;
  margin: 0 auto;
}

.comparison-note p {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* ═══════════════════════════════════════════════════════
   GALLERY
   ═══════════════════════════════════════════════════════ */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.gallery-card {
  position: relative;
  overflow: hidden;
  background: var(--color-card);
  border: 1px solid var(--color-gold-30);
  transition: border-color var(--transition);
}

.gallery-card:hover {
  border-color: var(--color-gold);
}

.gallery-card-btn {
  display: block;
  width: 100%;
  padding: 0;
  position: relative;
  cursor: pointer;
}

.gallery-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  transition: transform var(--transition);
}

.gallery-card:hover img {
  transform: scale(1.02);
}

.gallery-card figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 32px 14px 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-gold);
  background: linear-gradient(to top, rgba(0,0,0,0.75), transparent);
  text-align: left;
  pointer-events: none;
}

/* ═══════════════════════════════════════════════════════
   LIGHTBOX
   ═══════════════════════════════════════════════════════ */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.lightbox.open {
  opacity: 1;
  pointer-events: all;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  font-size: 2rem;
  color: var(--color-gold);
  line-height: 1;
  transition: color var(--transition);
}

.lightbox-close:hover {
  color: var(--color-white);
}

.lightbox-inner {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

#lightbox-img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border: 1px solid var(--color-gold-30);
}

.lightbox-caption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-gold);
}

/* ═══════════════════════════════════════════════════════
   ABOUT
   ═══════════════════════════════════════════════════════ */
.about-grid {
  display: grid;
  grid-template-columns: 60fr 40fr;
  gap: 60px;
  align-items: start;
}

.about-text p {
  color: var(--color-text);
  margin-bottom: 1.2em;
}

/* Research box */
.research-box {
  border: 1px solid var(--color-gold);
  background: var(--color-card);
  padding: 24px 28px;
  margin: 32px 0;
}

.research-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
  display: block;
  margin-bottom: 10px;
}

.research-box h3 {
  color: var(--color-white);
  font-size: 1rem;
  line-height: 1.45;
  margin-bottom: 6px;
}

.research-journal {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 16px;
}

/* External links */
.link-external {
  color: var(--color-gold);
  font-size: 0.9rem;
  position: relative;
  display: inline-block;
  transition: color var(--transition);
}

.link-external::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.link-external:hover::after {
  width: 100%;
}

.about-links {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

/* Photo placeholder */
.about-photo-col {
  display: flex;
  align-items: flex-start;
}

.about-photo-placeholder {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: var(--color-card);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-gold-30);
}

.about-photo-placeholder span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-muted);
}

/* ═══════════════════════════════════════════════════════
   CONTACT
   ═══════════════════════════════════════════════════════ */
.contact-container {
  max-width: 640px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

.form-group input,
.form-group textarea {
  background: var(--color-card);
  border: 1px solid var(--color-gold-30);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 12px 16px;
  width: 100%;
  transition: border-color var(--transition);
  resize: vertical;
  outline: none;
  border-radius: 0;
  -webkit-appearance: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-gold);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-muted);
}

.btn-submit {
  align-self: flex-start;
}

/* Form success state */
.form-success {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 32px;
  border: 1px solid var(--color-gold);
  background: var(--color-card);
}

.form-success[hidden] {
  display: none;
}

.success-check {
  font-size: 2rem;
  color: var(--color-gold);
  line-height: 1;
}

.form-success p {
  margin: 0;
  color: var(--color-text);
  font-size: 1rem;
}

/* ═══════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════ */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-gold);
  padding: 28px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-gold);
}

.footer-tagline {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE — TABLET  768px – 1100px
   ═══════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
  .pipeline-steps {
    gap: 20px;
  }
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE — MOBILE  < 768px
   ═══════════════════════════════════════════════════════ */
@media (max-width: 768px) {

  :root {
    --section-padding: 72px 20px;
  }

  /* Navbar */
  .navbar-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Pipeline steps: stack vertically */
  .pipeline-steps {
    grid-template-columns: 1fr;
  }

  /* Gallery: single column */
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  /* About: single column */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-photo-col {
    order: -1;
    justify-content: center;
  }

  .about-photo-placeholder {
    max-width: 240px;
    margin: 0 auto;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
  }
}