/* ============================================================
   COSMOS — Stylesheet
   Aesthetic: Deep space luxury · Editorial · Refined dark
   Fonts: Playfair Display + Space Mono
   ============================================================ */

:root {
  --bg:         #06080f;
  --bg2:        #0d1220;
  --bg3:        #141928;
  --border:     rgba(255, 255, 255, 0.08);
  --text:       #e8e4dc;
  --text-dim:   #8a8680;
  --text-faint: #4a4844;
  --accent:     #f5c842;
  --accent2:    #4a9eff;
  --accent3:    #ff6688;
  --glow:       rgba(245, 200, 66, 0.15);
  --radius:     12px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 14px;
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ── Starfield ── */
.starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.star {
  position: absolute;
  border-radius: 50%;
  background: white;
  animation: twinkle var(--dur, 3s) ease-in-out infinite var(--delay, 0s);
}

@keyframes twinkle {
  0%, 100% { opacity: var(--base-opacity, 0.6); transform: scale(1); }
  50%       { opacity: 0.1; transform: scale(0.6); }
}

/* ── Header ── */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(6, 8, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  height: 64px;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 40px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  color: var(--accent);
  font-size: 18px;
  animation: spin 20s linear infinite;
}

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

.logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 6px;
  color: var(--text);
}

nav {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 20px;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition);
}

.nav-btn:hover { color: var(--text); background: var(--border); }

.nav-btn.active {
  color: var(--accent);
  background: rgba(245, 200, 66, 0.12);
}

.live-time {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 1px;
  flex-shrink: 0;
}

/* ── Hero ── */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 80px 60px 60px;
  max-width: 1400px;
  margin: 0 auto;
  gap: 60px;
}

.hero-content { animation: fadeUp 1s ease both; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-eyebrow {
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(64px, 8vw, 110px);
  font-weight: 900;
  line-height: 0.95;
  margin-bottom: 28px;
  color: var(--text);
}

.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 3px;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
}

/* ── Orrery ── */
.hero-orrery {
  position: relative;
  width: 440px;
  height: 440px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeUp 1s 0.3s ease both;
}

.sun-glow {
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 220, 80, 0.4), transparent 70%);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50%       { transform: scale(1.3); opacity: 0.4; }
}

.sun {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff5a0, #ffc800, #ff8800);
  box-shadow: 0 0 40px rgba(255, 200, 0, 0.6);
  z-index: 2;
}

.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  animation: orbit var(--speed) linear infinite;
}

@keyframes orbit { to { transform: rotate(360deg); } }

.orbit-planet {
  width: var(--psize);
  height: var(--psize);
  border-radius: 50%;
  background: var(--pcolor);
  margin-top: calc(var(--psize) / -2);
  box-shadow: 0 0 8px var(--pcolor);
  position: relative;
}

/* ── Main Sections ── */
main {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px 80px;
}

.section { display: none; }
.section.active {
  display: block;
  animation: fadeUp 0.5s ease both;
}

.section-header {
  margin-bottom: 48px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 32px;
}

.section-header h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 900;
  line-height: 1;
  margin-bottom: 8px;
}

.section-header h2 em {
  font-style: italic;
  color: var(--accent);
}

.section-header p {
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ── Planets Grid ── */
.planets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.planet-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 24px;
  position: relative;
  overflow: hidden;
}

.planet-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, var(--card-glow, transparent), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.planet-card:hover {
  border-color: rgba(255,255,255,0.18);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.planet-card:hover::before { opacity: 1; }

.planet-visual {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.planet-sphere {
  border-radius: 50%;
  box-shadow: inset -4px -4px 12px rgba(0,0,0,0.5), 0 0 20px var(--sphere-glow);
  position: relative;
  transition: transform 0.6s ease;
}

.planet-card:hover .planet-sphere {
  transform: rotate(15deg) scale(1.08);
}

.planet-info { flex: 1; min-width: 0; }

.planet-order {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.planet-name {
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.planet-stats {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
}

.stat-label { color: var(--text-faint); }
.stat-val { color: var(--text-dim); }

.planet-arrow {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-faint);
  font-size: 16px;
  transition: all var(--transition);
}

.planet-card:hover .planet-arrow {
  color: var(--accent);
  transform: translateY(-50%) translateX(4px);
}

/* Saturn rings on card */
.rings-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring-decoration {
  position: absolute;
  border-radius: 50%;
  border: 3px solid rgba(212, 180, 131, 0.4);
  transform: rotateX(70deg);
  pointer-events: none;
}

/* ── Missions ── */
.missions-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mission-item {
  display: grid;
  grid-template-columns: 80px 180px 1fr 120px 100px;
  align-items: center;
  gap: 24px;
  padding: 20px 28px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: default;
}

.mission-item:hover {
  background: var(--bg3);
  border-color: rgba(255,255,255,0.12);
  transform: translateX(6px);
}

.mission-year {
  font-family: 'Playfair Display', serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-faint);
}

.mission-name {
  font-family: 'Playfair Display', serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.mission-desc {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

.mission-dest {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.mission-status {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  text-align: center;
  font-weight: 700;
}

.status-active   { background: rgba(74, 255, 140, 0.15); color: #4aff8c; }
.status-success  { background: rgba(245, 200, 66, 0.15); color: var(--accent); }
.status-done     { background: rgba(138, 134, 128, 0.15); color: var(--text-dim); }
.status-ongoing  { background: rgba(74, 158, 255, 0.15); color: var(--accent2); }

/* ── Facts ── */
.facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.fact-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.fact-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.fact-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
  border-color: rgba(255,255,255,0.14);
}

.fact-card:hover::after { transform: scaleX(1); }

.fact-icon {
  font-size: 36px;
  margin-bottom: 16px;
  display: block;
}

.fact-category {
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.fact-title {
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.fact-text {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.modal {
  background: var(--bg2);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 20px;
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.92) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: sticky;
  top: 20px;
  float: right;
  margin: 20px 20px 0 0;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  z-index: 10;
}

.modal-close:hover { color: var(--text); background: var(--border); }

.modal-body { padding: 40px; clear: both; }

.modal-planet-header {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 32px;
}

.modal-planet-visual {
  flex-shrink: 0;
}

.modal-planet-sphere {
  border-radius: 50%;
  box-shadow: inset -6px -6px 20px rgba(0,0,0,0.5), 0 0 40px var(--sphere-glow);
}

.modal-planet-meta { flex: 1; }

.modal-planet-name {
  font-family: 'Playfair Display', serif;
  font-size: 48px;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1;
}

.modal-planet-order {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.modal-planet-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.7;
}

.modal-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.modal-stat {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.modal-stat-label {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
}

.modal-stat-val {
  font-size: 13px;
  color: var(--text);
  font-weight: 700;
}

.modal-anecdotes-title {
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.anecdote-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

.anecdote-bullet {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 80px 24px 60px;
  }

  .hero-orrery { display: none; }

  .hero-sub { border-left: none; padding-left: 0; border-top: 2px solid var(--accent); padding-top: 12px; }

  header { padding: 0 20px; }
  .header-inner { gap: 16px; }
  .live-time { display: none; }

  main { padding: 0 20px 60px; }

  .mission-item {
    grid-template-columns: 60px 1fr;
    grid-template-rows: auto auto auto;
  }

  .mission-item .mission-year { grid-row: 1; }
  .mission-item .mission-name { grid-column: 2; }
  .mission-item .mission-desc { grid-column: 1 / -1; }
  .mission-item .mission-dest,
  .mission-item .mission-status { display: none; }

  .modal-planet-header { flex-direction: column; text-align: center; }
  .modal-stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }