:root {
  --bg-deep: #0a0e27;
  --bg-mid: #161b45;
  --panel: rgba(255,255,255,0.06);
  --panel-border: rgba(255,255,255,0.12);
  --text: #f2f4ff;
  --text-dim: #b7bce0;
  --gold: #ffd166;
  --coral: #ff6b6b;
  --teal: #4ecdc4;
  --violet: #a78bfa;
  --green: #7ee081;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --font-display: 'Baloo 2', system-ui, sans-serif;
  --font-body: 'Nunito', system-ui, sans-serif;
}

* { box-sizing: border-box; }

/* A `hidden` attribute must always win over any class's `display` rule below */
[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: radial-gradient(ellipse at 20% -10%, #26306e 0%, transparent 55%),
              radial-gradient(ellipse at 90% 0%, #3a2560 0%, transparent 45%),
              linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-mid) 55%, #0a0e27 100%);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

#starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1.5px 1.5px at 10% 20%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 80% 10%, #fff, transparent),
    radial-gradient(1px 1px at 45% 60%, #fff, transparent),
    radial-gradient(2px 2px at 65% 80%, #fff, transparent),
    radial-gradient(1px 1px at 25% 85%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 95% 50%, #fff, transparent),
    radial-gradient(1px 1px at 55% 35%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 5% 55%, #fff, transparent),
    radial-gradient(1px 1px at 35% 5%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 70% 65%, #fff, transparent);
  background-size: 100% 100%;
  opacity: 0.55;
  animation: twinkle 6s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: 0.35; } to { opacity: 0.65; } }

h1, h2, h3 { font-family: var(--font-display); margin: 0; font-weight: 700; letter-spacing: 0.2px; }

button { font-family: inherit; }

/* ---------- Topbar ---------- */
.topbar {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 6px 4px;
  text-align: left;
}
.brand-textwrap { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text { font-family: var(--font-display); font-size: 1.15rem; font-weight: 700; }
.brand-credit { font-family: var(--font-body); font-size: 0.72rem; font-weight: 700; color: var(--text-dim); letter-spacing: 0.3px; }
.brand-badge {
  display: inline-flex;
  width: 38px; height: 38px;
  align-items: center; justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--coral), var(--violet));
  font-size: 1.2rem;
  flex-shrink: 0;
}
.topnav { display: flex; gap: 8px; flex-wrap: wrap; }
.navbtn {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease;
}
.navbtn:hover { background: rgba(255,255,255,0.14); transform: translateY(-1px); }
.navbtn:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 2px;
}
.stats-pill {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 800;
  color: var(--gold);
}

/* ---------- Layout ---------- */
#app { position: relative; z-index: 2; max-width: 1100px; margin: 0 auto; padding: 20px 24px 80px; }
.screen { display: none; animation: fadeUp 0.4s ease; }
.screen.active { display: block; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.footer {
  position: relative; z-index: 2;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 20px;
}

/* ---------- Buttons ---------- */
.btn {
  border: none;
  cursor: pointer;
  font-weight: 800;
  font-family: var(--font-display);
  border-radius: 999px;
  padding: 14px 28px;
  font-size: 1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: scale(0.96); }
.btn-primary {
  background: linear-gradient(135deg, var(--coral), #ff9466);
  color: #2a0e0e;
  box-shadow: 0 8px 24px rgba(255,107,107,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(255,107,107,0.45); }
.btn-ghost {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(255,255,255,0.14); }
.mini-btn {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
}
.mini-btn:hover { background: rgba(255,255,255,0.14); }

/* ---------- Hero ---------- */
.hero {
  display: flex;
  align-items: center;
  gap: 40px;
  padding: 40px 8px 60px;
  flex-wrap: wrap;
}
.hero-text { flex: 1 1 420px; min-width: 280px; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--teal);
  margin: 0 0 12px;
}
.hero-text h1 { font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.1; margin-bottom: 18px; }
.hl { color: var(--gold); }
.hero-sub { color: var(--text-dim); font-size: 1.05rem; max-width: 42ch; margin-bottom: 26px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-art {
  flex: 1 1 260px;
  min-width: 220px;
  position: relative;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.planet {
  position: absolute;
  border-radius: 50%;
}
.planet-1 {
  width: 90px; height: 90px;
  background: radial-gradient(circle at 35% 30%, #ffe29a, var(--gold) 60%, #c9861f 100%);
  top: 10px; right: 30px;
  box-shadow: 0 0 40px rgba(255,209,102,0.4);
  animation: float1 5s ease-in-out infinite;
}
.planet-2 {
  width: 50px; height: 50px;
  background: radial-gradient(circle at 35% 30%, #b9f3ee, var(--teal) 60%, #216b66 100%);
  bottom: 10px; left: 10px;
  box-shadow: 0 0 30px rgba(78,205,196,0.4);
  animation: float2 6s ease-in-out infinite;
}
@keyframes float1 { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
@keyframes float2 { 0%,100% { transform: translateY(0); } 50% { transform: translateY(12px); } }
.rocket-hero {
  font-size: 5rem;
  transform: rotate(35deg);
  filter: drop-shadow(0 10px 20px rgba(0,0,0,0.4));
  animation: hover 3s ease-in-out infinite;
  z-index: 2;
}
@keyframes hover { 0%,100% { transform: rotate(35deg) translateY(0); } 50% { transform: rotate(35deg) translateY(-16px); } }
.trail {
  position: absolute;
  width: 4px; height: 90px;
  background: linear-gradient(180deg, rgba(255,209,102,0.9), transparent);
  transform: rotate(35deg) translate(38px, 50px);
  filter: blur(1px);
}

/* ---------- Cards ---------- */
.card-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  margin-top: 10px;
}
.feature-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  text-align: left;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--teal);
  background: rgba(255,255,255,0.1);
}
.feature-icon { font-size: 2rem; display: block; margin-bottom: 10px; }
.feature-card h3 { margin-bottom: 8px; font-size: 1.2rem; }
.feature-card p { margin: 0 0 12px; color: var(--text-dim); font-size: 0.92rem; line-height: 1.5; }
.howto-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.howto-list li::marker { color: var(--teal); font-weight: 800; }
.howto-list-overlay {
  text-align: left;
  max-width: 42ch;
  font-size: 0.95rem;
}

/* ---------- Screen titles ---------- */
.screen-title { font-size: clamp(1.6rem, 4vw, 2.4rem); margin-bottom: 6px; }
.screen-sub { color: var(--text-dim); margin: 0 0 28px; }

/* ---------- Practice setup ---------- */
.setup-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 28px;
}
@media (max-width: 800px) { .setup-grid { grid-template-columns: 1fr; } }
.setup-block {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.setup-block h3 { font-size: 1rem; margin-bottom: 12px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; font-family: var(--font-body); font-weight: 800; }
.setup-block h3:not(:first-child) { margin-top: 22px; }
.table-select-row { display: flex; gap: 10px; margin-bottom: 14px; }
.table-picker {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(52px, 1fr));
  gap: 8px;
}
.table-chip {
  background: rgba(255,255,255,0.05);
  border: 2px solid var(--panel-border);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 0;
  text-align: center;
  font-weight: 800;
  cursor: pointer;
  font-family: var(--font-display);
}
.table-chip.selected {
  background: linear-gradient(135deg, var(--teal), #2a9d94);
  border-color: var(--teal);
  color: #06201d;
}
.choice-row { display: flex; gap: 10px; flex-wrap: wrap; }
.choice-btn {
  flex: 1 1 auto;
  background: rgba(255,255,255,0.05);
  border: 2px solid var(--panel-border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  min-width: 120px;
}
.choice-btn.active {
  background: linear-gradient(135deg, var(--violet), #7c5cd6);
  border-color: var(--violet);
  color: #fff;
}
.btn-launch { width: 100%; margin-top: 26px; font-size: 1.1rem; }
.setup-error { color: var(--coral); font-weight: 700; margin-top: 10px; text-align: center; }

/* ---------- Quiz ---------- */
.quiz-hud {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
}
.hud-label { display: block; font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }
.hud-left, .hud-right { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; text-align: center; }
.hud-track {
  position: relative;
  height: 10px;
  background: rgba(255,255,255,0.1);
  border-radius: 999px;
  overflow: visible;
}
.hud-progress-fill {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 0%;
  background: linear-gradient(90deg, var(--teal), var(--gold));
  border-radius: 999px;
  transition: width 0.4s ease;
}
.hud-rocket {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translate(-50%, -50%) rotate(90deg);
  font-size: 1.4rem;
  transition: left 0.4s ease;
}
.timer-ring-wrap {
  position: relative;
  width: 80px; height: 80px;
  margin: 0 auto 20px;
}
.timer-ring { width: 80px; height: 80px; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: rgba(255,255,255,0.12); stroke-width: 7; }
.ring-fg {
  fill: none;
  stroke: var(--gold);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-dasharray: 213.5;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}
.timer-num {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 1.4rem; font-weight: 800;
}
.quiz-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 46px 30px;
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
}
.quiz-question { font-size: 3rem; font-family: var(--font-display); margin: 0 0 24px; }
.answer-row { display: flex; gap: 12px; justify-content: center; }
.answer-input {
  width: 130px;
  font-size: 1.6rem;
  font-family: var(--font-display);
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--panel-border);
  background: rgba(255,255,255,0.06);
  color: var(--text);
}
.quiz-feedback { min-height: 28px; margin-top: 18px; font-weight: 800; font-size: 1.1rem; }
.quiz-feedback.correct { color: var(--green); }
.quiz-feedback.wrong { color: var(--coral); }
.quiz-streak { text-align: center; color: var(--text-dim); margin-top: 14px; font-weight: 700; }

/* ---------- Results ---------- */
.results-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 46px 30px;
  text-align: center;
  max-width: 500px;
  margin: 20px auto;
}
.results-badge { font-size: 3.5rem; margin-bottom: 10px; }
.results-card h2 { margin-bottom: 8px; font-size: 1.9rem; }
.results-card p { color: var(--text-dim); margin-bottom: 24px; }
.results-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: 30px;
}
.results-stats span { display: block; font-family: var(--font-display); font-size: 1.8rem; color: var(--gold); }
.results-stats small { color: var(--text-dim); font-size: 0.8rem; }
.results-ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- Star map / chart ---------- */
.planet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 14px;
  margin-bottom: 30px;
}
.planet-btn {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 16px 8px;
  text-align: center;
  color: var(--text);
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  transition: transform 0.15s ease;
}
.planet-btn:hover { transform: translateY(-3px) scale(1.03); }
.planet-emoji { display: block; font-size: 1.8rem; margin-bottom: 6px; }
.table-detail {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.table-detail-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.table-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}
.table-row {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 700;
  font-family: var(--font-display);
}

/* ---------- Games ---------- */
.game-hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}
.game-field {
  position: relative;
  height: min(460px, 56vh);
  min-height: 240px;
  background: linear-gradient(180deg, rgba(10,14,39,0.4), rgba(10,14,39,0.85));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.ship-dock {
  position: absolute;
  bottom: 10px; left: 50%;
  transform: translateX(-50%);
  font-size: 2.2rem;
}
.asteroid {
  position: absolute;
  top: -60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  max-width: 220px;
  transition: top linear;
}
.asteroid-rock {
  font-size: 2rem;
  background: rgba(0,0,0,0.25);
  border-radius: 50%;
  padding: 6px 10px;
}
.asteroid-options { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
.asteroid-opt {
  background: var(--panel);
  border: 2px solid var(--panel-border);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 800;
  cursor: pointer;
  font-family: var(--font-display);
}
.asteroid-opt:hover { background: rgba(255,255,255,0.16); }
.game-start-overlay, .game-over-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10,14,39,0.92);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 14px;
  padding: 30px;
  z-index: 10;
}
.game-start-overlay h3, .game-over-overlay h3 { font-size: 1.8rem; }
.game-start-overlay p, .game-over-overlay p { color: var(--text-dim); max-width: 40ch; }

.comet-stage {
  position: relative;
  height: min(320px, 48vh);
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(10,14,39,0.4), rgba(10,14,39,0.85));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.comet-card { text-align: center; position: relative; z-index: 2; }
.comet-card .answer-row { margin-top: 20px; }
.comet-card.shake { animation: cometShake 0.4s ease; }
@keyframes cometShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-10px); }
  40% { transform: translateX(9px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(4px); }
}
.comet-flyby {
  position: absolute;
  left: -60px;
  top: 22%;
  font-size: 2.2rem;
  opacity: 0;
  z-index: 1;
  filter: drop-shadow(0 0 10px rgba(255,209,102,0.7));
}
.comet-flyby.launch {
  animation: cometFly 0.9s cubic-bezier(0.2, 0.7, 0.4, 1);
}
@keyframes cometFly {
  0% { left: -60px; top: 65%; opacity: 0; transform: rotate(20deg) scale(0.8); }
  15% { opacity: 1; }
  100% { left: 110%; top: 5%; opacity: 0; transform: rotate(20deg) scale(1.3); }
}

/* Position container relatively for overlays */
#screen-game-asteroids, #screen-game-comet { position: relative; }

/* On short windows, reclaim vertical space so the game area (and its
   answer buttons) never gets pushed below the visible viewport. */
@media (max-height: 700px) {
  .topbar { padding: 8px 20px; }
  .footer { padding: 8px; font-size: 0.75rem; }
  #app { padding-top: 8px; padding-bottom: 24px; }
  .game-hud { margin-bottom: 8px; }
  .asteroid-rock { font-size: 1.5rem; padding: 4px 8px; }
  .asteroid-opt { padding: 6px 10px; font-size: 0.9rem; }
}