/* ============================================================
   style.css — Celestial Frontier Space Colony Builder
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Exo+2:ital,wght@0,300;0,400;0,500;0,600;1,400&display=swap');

/* ── CSS Variables ────────────────────────────────────────── */
:root {
  --bg-deep:      #020b18;
  --bg-card:      #081428;
  --bg-card2:     #0a1a30;
  --border:       #1a3a5c;
  --border-glow:  #1e6fa8;
  --accent-blue:  #00d4ff;
  --accent-cyan:  #00ffea;
  --accent-purple:#b45ef5;
  --accent-gold:  #ffd740;
  --accent-green: #69f0ae;
  --accent-red:   #ff5252;
  --accent-orange:#ff9800;
  --text-primary: #e8f4fd;
  --text-dim:     #7ba8cc;
  --text-muted:   #4a7ea5;
  --font-head:    'Orbitron', sans-serif;
  --font-body:    'Exo 2', sans-serif;
  --radius:       10px;
  --radius-sm:    6px;
  --shadow-glow:  0 0 20px rgba(0, 212, 255, 0.25);
  --shadow-card:  0 4px 20px rgba(0, 0, 0, 0.6);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Utility ──────────────────────────────────────────────── */
.hidden { display: none !important; }
.screen { width: 100%; min-height: 100vh; }

a { color: var(--accent-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Twinkling Stars Background ──────────────────────────── */
.star-field {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

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

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.8); }
  50%       { opacity: var(--bright, 0.8); transform: scale(1); }
}

.nebula {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: nebulaDrift 20s ease-in-out infinite alternate;
}

.nebula-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(100, 0, 200, 0.12), transparent 70%);
  top: -200px; right: -100px;
}

.nebula-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0, 150, 220, 0.10), transparent 70%);
  bottom: -150px; left: -100px;
}

.nebula-3 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0, 200, 180, 0.08), transparent 70%);
  top: 40%; left: 40%;
}

@keyframes nebulaDrift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, -20px) scale(1.05); }
}

/* ── Landing Screen ───────────────────────────────────────── */
#landing-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 40px 20px;
  position: relative;
}

.landing-content {
  position: relative;
  z-index: 1;
  max-width: 960px;
  width: 100%;
  text-align: center;
}

.landing-logo {
  font-size: 4rem;
  margin-bottom: 8px;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}

.landing-title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 8px;
  text-shadow: none;
  filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.4));
}

.landing-subtitle {
  font-family: var(--font-head);
  font-size: clamp(0.8rem, 1.5vw, 1rem);
  color: var(--accent-gold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 36px;
}

.setup-panel {
  background: rgba(8, 20, 40, 0.85);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

.setup-label {
  font-family: var(--font-head);
  font-size: 0.75rem;
  color: var(--accent-blue);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 10px;
}

.colony-name-input {
  width: 100%;
  max-width: 400px;
  background: rgba(0, 20, 50, 0.8);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-head);
  font-size: 1rem;
  padding: 12px 16px;
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
  margin-bottom: 28px;
}

.colony-name-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 255, 234, 0.3);
}

.colony-name-input::placeholder { color: var(--text-muted); }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60%  { transform: translateX(-6px); }
  40%, 80%  { transform: translateX(6px); }
}
.shake { animation: shake 0.4s ease; }

.celestial-select-label {
  font-family: var(--font-head);
  font-size: 0.75rem;
  color: var(--accent-blue);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: block;
}

#celestial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.celestial-card {
  background: rgba(5, 15, 35, 0.9);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  cursor: pointer;
  transition: border-color 0.3s, transform 0.2s, box-shadow 0.3s;
  text-align: left;
}

.celestial-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 100, 200, 0.3);
}

.celestial-card.selected {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 234, 0.35);
  background: rgba(0, 50, 80, 0.6);
}

.celestial-emoji {
  font-size: 2.5rem;
  margin-bottom: 8px;
  display: block;
}

.celestial-name {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.celestial-difficulty {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 8px;
}

.difficulty-moderate { background: rgba(105, 240, 174, 0.2); color: var(--accent-green); border: 1px solid var(--accent-green); }
.difficulty-hard     { background: rgba(255, 152, 0, 0.2);   color: var(--accent-orange); border: 1px solid var(--accent-orange); }
.difficulty-expert   { background: rgba(255, 82, 82, 0.2);   color: var(--accent-red);    border: 1px solid var(--accent-red); }

.celestial-desc {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.launch-btn {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 40px;
  background: linear-gradient(135deg, #005f8c, #0095d5);
  border: 1px solid var(--accent-blue);
  border-radius: 50px;
  color: #fff;
  cursor: pointer;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.launch-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.05), transparent);
  border-radius: inherit;
}

.launch-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
  background: linear-gradient(135deg, #0080bb, #00b8ff);
}

.launch-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Game Screen ──────────────────────────────────────────── */
#game-screen {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  position: relative;
}

/* ── Header ───────────────────────────────────────────────── */
.game-header {
  background: rgba(5, 15, 35, 0.95);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  z-index: 10;
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
}

.game-header-logo {
  font-size: 1.4rem;
  font-weight: 900;
  font-family: var(--font-head);
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.header-info {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  flex-wrap: wrap;
}

.colony-badge {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.location-badge {
  background: rgba(0, 50, 80, 0.8);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.sol-badge {
  font-family: var(--font-head);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  padding: 3px 10px;
  border-radius: 20px;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* ── Main Layout ──────────────────────────────────────────── */
.game-main {
  display: grid;
  grid-template-columns: 260px 1fr 260px;
  grid-template-rows: auto 1fr;
  gap: 0;
  min-height: 0;
  position: relative;
}

@media (max-width: 1100px) {
  .game-main {
    grid-template-columns: 220px 1fr 220px;
  }
}

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

/* ── Resources Panel ──────────────────────────────────────── */
.resources-panel {
  grid-column: 1 / -1;
  background: rgba(5, 12, 28, 0.95);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  z-index: 5;
}

.resource-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(8, 20, 40, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  min-width: 130px;
  flex: 1;
  max-width: 180px;
  transition: border-color 0.3s;
}

.resource-item.critical {
  border-color: var(--accent-red);
  animation: pulse-critical 1.5s ease-in-out infinite;
}

@keyframes pulse-critical {
  0%, 100% { box-shadow: none; }
  50%       { box-shadow: 0 0 10px rgba(255, 82, 82, 0.5); }
}

.resource-emoji { font-size: 1.1rem; flex-shrink: 0; }

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

.resource-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.resource-bar-wrap {
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  overflow: hidden;
  margin: 3px 0;
}

.resource-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.5s ease, background 0.3s;
}

.resource-numbers {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.resource-value {
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

.resource-delta {
  font-size: 0.7rem;
  font-weight: 600;
}

.delta-positive { color: var(--accent-green); }
.delta-negative { color: var(--accent-red); }

/* Stats bar (population, morale, research) */
.stats-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 20px;
  background: rgba(5, 10, 25, 0.95);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-value {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.morale-bar-wrap {
  width: 80px;
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
}

#morale-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease, background 0.3s;
}

/* ── Left Panel: Buildings ────────────────────────────────── */
.left-panel {
  background: rgba(5, 12, 28, 0.98);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel-title {
  font-family: var(--font-head);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-blue);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}

#building-hint {
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 0.75rem;
  color: var(--accent-cyan);
  line-height: 1.4;
}

#building-cards {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.building-card {
  background: rgba(8, 20, 45, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
}

.building-card:hover { border-color: var(--border-glow); transform: translateX(2px); }
.building-card.selected { border-color: var(--accent-cyan); box-shadow: 0 0 10px rgba(0, 255, 234, 0.25); background: rgba(0, 50, 80, 0.5); }
.building-card.unaffordable { opacity: 0.5; cursor: not-allowed; }
.building-card.unaffordable:hover { transform: none; }

.bld-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.bld-emoji { font-size: 1.1rem; }
.bld-name  { font-size: 0.8rem; font-weight: 600; flex: 1; }
.bld-count { font-size: 0.68rem; color: var(--text-muted); font-family: var(--font-head); }

.bld-cost {
  display: flex;
  gap: 10px;
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.bld-effects {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 0.68rem;
}

.bld-effects .pos { color: var(--accent-green); }
.bld-effects .neg { color: var(--accent-red); }

/* ── Centre: Colony Grid ──────────────────────────────────── */
.centre-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  gap: 14px;
  overflow-y: auto;
  background: var(--bg-deep);
}

.grid-label {
  font-family: var(--font-head);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-blue);
  align-self: flex-start;
}

#colony-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  width: 100%;
  max-width: 480px;
}

.grid-tile {
  aspect-ratio: 1;
  background: rgba(8, 20, 45, 0.7);
  border: 1px solid rgba(26, 58, 92, 0.6);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
  position: relative;
  font-size: clamp(0.9rem, 2.2vw, 1.4rem);
  user-select: none;
}

.grid-tile:hover { border-color: var(--border-glow); background: rgba(0, 50, 100, 0.5); }
.grid-tile.placeable { border-color: rgba(0, 255, 234, 0.5); background: rgba(0, 255, 234, 0.05); }
.grid-tile.placeable:hover { border-color: var(--accent-cyan); background: rgba(0, 255, 234, 0.1); transform: scale(1.05); }
.grid-tile.has-building { background: rgba(0, 30, 70, 0.8); border-color: var(--border-glow); }
.grid-tile.has-building:hover { border-color: var(--accent-red); background: rgba(60, 0, 0, 0.4); }
.grid-tile.offline { opacity: 0.55; }
.grid-tile.offline .tile-emoji { filter: grayscale(0.8); }

.tile-emoji { line-height: 1; }
.tile-empty-dot { color: rgba(255,255,255,0.12); font-size: 0.6rem; }

.offline-badge {
  position: absolute;
  top: -4px; right: -4px;
  background: var(--accent-orange);
  color: #000;
  font-size: 0.55rem;
  font-weight: 700;
  width: 16px; height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
}

/* ── Right Panel: Info + Log ──────────────────────────────── */
.right-panel {
  background: rgba(5, 12, 28, 0.98);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.event-log-wrap {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

#event-log {
  display: flex;
  flex-direction: column;
  gap: 5px;
  max-height: 300px;
  overflow-y: auto;
}

.log-entry {
  font-size: 0.75rem;
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  line-height: 1.4;
  border-left: 3px solid transparent;
}

.log-sol {
  font-family: var(--font-head);
  font-size: 0.62rem;
  color: var(--text-muted);
  margin-right: 6px;
}

.log-good    { background: rgba(105, 240, 174, 0.08); border-left-color: var(--accent-green); }
.log-bad     { background: rgba(255, 82, 82, 0.08);   border-left-color: var(--accent-red); }
.log-neutral { background: rgba(255, 255, 255, 0.04); border-left-color: var(--border); }

/* ── Research Panel ───────────────────────────────────────── */
.research-section {
  padding: 14px;
}

.research-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

#research-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.research-card {
  background: rgba(8, 20, 45, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  transition: border-color 0.2s;
}

.research-card:hover { border-color: var(--border-glow); }
.research-card.unlocked { border-color: rgba(105, 240, 174, 0.5); background: rgba(0, 40, 30, 0.4); }
.research-card.locked { opacity: 0.6; }
.research-card.no-lab { opacity: 0.5; }

.research-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.research-emoji { font-size: 1.3rem; }
.research-name  { font-size: 0.82rem; font-weight: 600; flex: 1; }
.research-cost  { font-size: 0.75rem; color: var(--accent-cyan); font-family: var(--font-head); font-weight: 600; }

.research-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.4;
  margin-bottom: 8px;
}

.research-req {
  font-size: 0.7rem;
  color: var(--accent-orange);
  margin-bottom: 6px;
}

.research-status {
  font-size: 0.72rem;
  color: var(--accent-green);
  font-weight: 600;
}

.research-btn {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 6px 14px;
  background: linear-gradient(135deg, #003560, #005f8c);
  border: 1px solid var(--accent-blue);
  border-radius: 20px;
  color: #fff;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: all 0.2s;
}

.research-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, #004f8f, #0085c5);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
}

.research-btn.disabled, .research-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Educational Sidebar ──────────────────────────────────── */
#educational-sidebar {
  background: rgba(5, 12, 28, 0.98);
  border-top: 1px solid var(--border);
  padding: 14px 20px;
  transition: max-height 0.4s ease, opacity 0.3s;
}

#educational-sidebar.collapsed .sidebar-content {
  display: none;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

#sidebar-title {
  font-family: var(--font-head);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-purple);
}

#sidebar-toggle {
  background: rgba(0, 50, 80, 0.7);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 4px 12px;
  cursor: pointer;
  transition: all 0.2s;
}

#sidebar-toggle:hover { border-color: var(--accent-blue); color: var(--accent-blue); }

.sidebar-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 700px) {
  .sidebar-content { grid-template-columns: 1fr; }
}

#facts-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#facts-list li {
  font-size: 0.78rem;
  color: var(--text-dim);
  padding-left: 12px;
  border-left: 2px solid var(--accent-purple);
  line-height: 1.4;
}

.sidebar-links-title {
  font-size: 0.72rem;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

#facts-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#facts-links a {
  font-size: 0.78rem;
  color: var(--accent-cyan);
  padding: 6px 10px;
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

#facts-links a:hover {
  background: rgba(0, 212, 255, 0.12);
  text-decoration: none;
}

/* ── Footer Controls ──────────────────────────────────────── */
.game-footer {
  background: rgba(5, 10, 25, 0.98);
  border-top: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  z-index: 10;
}

#next-sol-btn {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 12px 32px;
  background: linear-gradient(135deg, #004f8f, #00adef);
  border: 1px solid var(--accent-blue);
  border-radius: 50px;
  color: #fff;
  cursor: pointer;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

#next-sol-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s;
}

#next-sol-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(0, 173, 239, 0.5);
}

#next-sol-btn:hover::after { transform: translateX(100%); }
#next-sol-btn:active { transform: translateY(0); }

.footer-hint {
  font-size: 0.73rem;
  color: var(--text-muted);
}

/* ── Win / Lose Modals ────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-box {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 36px;
  max-width: 460px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-glow), var(--shadow-card);
  position: relative;
}

.modal-title {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 6px;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.win-modal .modal-box  { border: 2px solid var(--accent-green); }
.lose-modal .modal-box { border: 2px solid var(--accent-red); }

.modal-win-title  { color: var(--accent-green); }
.modal-lose-title { color: var(--accent-red); }

#win-stats, #lose-reason {
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 20px;
  text-align: left;
}

#win-stats p, #lose-reason p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  line-height: 1.5;
}

#win-stats p strong, #lose-reason p strong {
  color: var(--text-primary);
}

.modal-btn {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 12px 30px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: all 0.3s;
}

.modal-btn-win {
  background: linear-gradient(135deg, #005c30, #00b060);
  color: #fff;
  border: 1px solid var(--accent-green);
}

.modal-btn-win:hover { box-shadow: 0 0 20px rgba(105, 240, 174, 0.4); transform: translateY(-2px); }

.modal-btn-lose {
  background: linear-gradient(135deg, #5c0000, #b00000);
  color: #fff;
  border: 1px solid var(--accent-red);
}

.modal-btn-lose:hover { box-shadow: 0 0 20px rgba(255, 82, 82, 0.4); transform: translateY(-2px); }

/* ── Toast Notifications ──────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 80px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: 360px;
  width: 100%;
}

.toast {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 0.8rem;
  line-height: 1.4;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: auto;
}

.toast.visible { opacity: 1; transform: translateX(0); }
.toast-good    { border-left: 3px solid var(--accent-green); }
.toast-bad     { border-left: 3px solid var(--accent-red); }
.toast-neutral { border-left: 3px solid var(--accent-blue); }

/* ── Celestial Body Background Themes ────────────────────── */
.bg-mars   { --terrain-bg: #1a0a00; --terrain-border: #8b3a00; }
.bg-moon   { --terrain-bg: #0f0f14; --terrain-border: #3a3a50; }
.bg-europa { --terrain-bg: #001428; --terrain-border: #004470; }
.bg-titan  { --terrain-bg: #1a1000; --terrain-border: #5c4400; }

/* ── Scrollbars ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: rgba(0,0,0,0.2); }
::-webkit-scrollbar-thumb { background: var(--border-glow); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-blue); }

/* ── Game body layout fix ─────────────────────────────────── */
#game-screen {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.game-body {
  display: grid;
  grid-template-columns: 260px 1fr 260px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

@media (max-width: 1100px) {
  .game-body { grid-template-columns: 220px 1fr 220px; }
}

@media (max-width: 860px) {
  .game-body {
    grid-template-columns: 1fr;
    overflow-y: auto;
  }
  .left-panel, .right-panel {
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--border);
  }
}

/* ── Research Section Layout ──────────────────────────────── */
.research-section {
  background: rgba(5, 10, 25, 0.95);
  border-top: 1px solid var(--border);
  padding: 14px 20px;
}

.research-toggle-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 4px 12px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}

.research-toggle-btn:hover { border-color: var(--accent-purple); color: var(--accent-purple); }

.research-content { margin-top: 12px; }
.research-content.collapsed { display: none; }