/* Space Knowledge Quiz — dark launch-pad arcade */
:root {
  --bg: #050814;
  --bg-2: #0a1024;
  --card: rgba(12, 20, 48, 0.92);
  --line: rgba(120, 180, 255, 0.22);
  --ink: #e8eefc;
  --muted: #9aa8c7;
  --cyan: #4de1ff;
  --cyan-dim: #1a8fad;
  --amber: #ffc14d;
  --magenta: #ff5ec8;
  --good: #3dff9a;
  --bad: #ff5e7a;
  --danger: #ff4d6d;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  --r: 18px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; min-height: 100%;
  background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 17px; line-height: 1.45;
  -webkit-text-size-adjust: 100%;
}
body { overflow-x: hidden; }

.stars {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(1px 1px at 12% 18%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 28% 62%, #bcd 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 44% 30%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 61% 78%, #9cf 50%, transparent 51%),
    radial-gradient(1px 1px at 73% 22%, #fff 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 88% 55%, #def 50%, transparent 51%),
    radial-gradient(1px 1px at 16% 88%, #fff 50%, transparent 51%),
    radial-gradient(800px 500px at 50% -10%, rgba(40, 80, 180, 0.35), transparent 60%),
    radial-gradient(600px 400px at 80% 100%, rgba(120, 40, 160, 0.18), transparent 55%),
    linear-gradient(180deg, #050814 0%, #0a1024 50%, #08101c 100%);
}

.app {
  position: relative; z-index: 1;
  max-width: 720px; margin: 0 auto;
  padding: 16px 16px 48px;
  min-height: 100vh;
}

.screen[hidden] { display: none !important; }
.screen.active { display: block; }

.topbar {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 18px; padding-top: 6px;
}
.brand-link {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: inherit;
  border-radius: 14px; max-width: 100%;
}
.brand-link:hover .brand-name { color: var(--cyan); }
.brand-link:focus-visible {
  outline: 2px solid var(--cyan); outline-offset: 4px;
}
.brand-mark {
  width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center; font-size: 26px;
  background: linear-gradient(160deg, #1a2a55, #0d1633);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  flex-shrink: 0;
}
.brand-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.brand-kicker { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cyan); font-weight: 700; }
.brand-name { font-size: 15px; color: var(--muted); font-weight: 600; }

.hero-card, .quiz-card, .results-card, .board-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 22px 20px 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.eyebrow {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.16em;
  color: var(--amber); font-weight: 700;
}
h1 {
  margin: 0 0 12px; font-size: clamp(1.7rem, 5vw, 2.25rem);
  line-height: 1.15; font-weight: 900;
  background: linear-gradient(90deg, #fff, #9be7ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
h2 { margin: 0 0 14px; font-size: 1.55rem; font-weight: 800; }
.lead { margin: 0 0 14px; color: var(--muted); font-size: 1.02rem; }
.lead strong { color: var(--cyan); }

.rules {
  margin: 0 0 20px; padding: 0 0 0 18px; color: var(--muted);
}
.rules li { margin: 6px 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 100%; min-height: 52px; margin: 8px 0;
  padding: 12px 18px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  font-size: 1.05rem; font-weight: 800;
  transition: transform 0.08s ease, filter 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; }
.btn[disabled] { opacity: 0.45; cursor: default; }

.btn-primary {
  color: #041018;
  background: linear-gradient(180deg, #7af0ff 0%, #2ec4e0 45%, #1498b8 100%);
  border-color: #0d6f88;
  box-shadow: 0 4px 0 #0a5366, 0 10px 24px rgba(46, 196, 224, 0.28);
}
.btn-primary:hover { filter: brightness(1.06); }

.btn-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); }

.btn-danger {
  color: #fff;
  background: rgba(255, 77, 109, 0.15);
  border-color: rgba(255, 77, 109, 0.45);
}
.btn-sm { min-height: 44px; font-size: 0.95rem; width: auto; flex: 1; margin: 0; }

.site-foot {
  text-align: center; margin-top: 28px; color: var(--muted); font-size: 0.9rem;
}
.site-foot a { color: var(--cyan); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; }
.copy { opacity: 0.7; margin-top: 4px; }

/* HUD */
.quiz-hud {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px;
  margin-bottom: 14px;
}
.quiz-hud > div {
  background: rgba(8, 14, 32, 0.85);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 8px; text-align: center;
}
.hud-label {
  display: block; font-size: 11px; letter-spacing: 0.14em;
  color: var(--muted); font-weight: 700;
}
.timer {
  font-family: var(--mono); font-size: 1.55rem; font-weight: 800; color: var(--cyan);
}
.timer.warn { color: var(--amber); }
.timer.critical { color: var(--danger); animation: pulse 0.8s ease infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.65; }
}
#q-progress, #live-score {
  font-family: var(--mono); font-size: 1.2rem; font-weight: 800; color: var(--ink);
}

.question-text {
  font-size: clamp(1.15rem, 3.6vw, 1.35rem);
  line-height: 1.35; margin-bottom: 16px;
}

.options { display: flex; flex-direction: column; gap: 10px; }
.opt {
  width: 100%; text-align: left;
  min-height: 54px; padding: 14px 16px;
  border-radius: 14px; cursor: pointer;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink); font-size: 1rem; font-weight: 650;
  transition: border-color 0.12s, background 0.12s, transform 0.08s;
}
.opt:hover:not(:disabled) {
  border-color: var(--cyan);
  background: rgba(77, 225, 255, 0.08);
}
.opt:disabled { cursor: default; }
.opt.correct {
  border-color: var(--good);
  background: rgba(61, 255, 154, 0.14);
}
.opt.wrong {
  border-color: var(--bad);
  background: rgba(255, 94, 122, 0.14);
}
.opt.dim { opacity: 0.45; }

.explain {
  margin: 14px 0 0; padding: 12px 14px;
  border-radius: 12px;
  background: rgba(77, 225, 255, 0.08);
  border: 1px solid rgba(77, 225, 255, 0.25);
  color: var(--muted); font-size: 0.95rem;
}
.quiz-actions {
  display: flex; gap: 10px; margin-top: 16px;
}

/* Results */
.score-hero {
  display: flex; align-items: baseline; gap: 8px;
  margin: 8px 0 18px;
}
.score-big {
  font-family: var(--mono); font-size: clamp(2.8rem, 12vw, 4rem);
  font-weight: 900; color: var(--cyan); line-height: 1;
}
.score-of { color: var(--muted); font-weight: 700; font-size: 1.1rem; }

.stat-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px;
  margin-bottom: 20px;
}
.stat-grid-3 { grid-template-columns: repeat(3, 1fr); }
.stat-grid > div {
  text-align: center; padding: 10px 4px;
  border-radius: 12px; border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.2);
}
.stat-n { display: block; font-family: var(--mono); font-weight: 800; font-size: 1.15rem; }
.stat-l { display: block; font-size: 11px; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; margin-top: 2px; }

.initials-block {
  margin: 8px 0 16px; padding: 16px;
  border-radius: 14px;
  border: 1px dashed rgba(255, 193, 77, 0.45);
  background: rgba(255, 193, 77, 0.06);
}
.initials-block label {
  display: block; font-weight: 700; margin-bottom: 10px; color: var(--amber);
}
.initials-row { display: flex; gap: 10px; flex-wrap: wrap; }
#initials-input {
  width: 110px; min-height: 52px;
  text-align: center; text-transform: uppercase;
  font-family: var(--mono); font-size: 1.6rem; font-weight: 900;
  letter-spacing: 0.2em;
  border-radius: 12px; border: 2px solid var(--amber);
  background: #0a1020; color: var(--ink);
  padding: 8px;
}
#initials-input:focus { outline: none; box-shadow: 0 0 0 3px rgba(255, 193, 77, 0.35); }
.initials-row .btn { width: auto; flex: 1; min-width: 140px; margin: 0; }
.hint { margin: 8px 0 0; font-size: 0.88rem; color: var(--muted); }
.submit-status { margin: 10px 0 0; font-weight: 700; min-height: 1.2em; }
.submit-status.ok { color: var(--good); }
.submit-status.err { color: var(--bad); }

.results-actions { display: grid; gap: 0; }
.results-actions .btn { margin: 6px 0; }

/* Board */
.board-sub {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
  color: var(--muted); margin: -6px 0 14px;
}
.board-list {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 16px;
  background: rgba(0, 0, 0, 0.25);
}
.board-row {
  display: grid;
  grid-template-columns: 48px 64px 1fr 72px;
  gap: 6px; align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(120, 180, 255, 0.12);
  font-family: var(--mono); font-size: 0.95rem;
}
.board-row:last-child { border-bottom: none; }
.board-row.top3 { background: rgba(255, 193, 77, 0.08); }
.board-row .rank { color: var(--amber); font-weight: 800; }
.board-row .ini { color: var(--cyan); font-weight: 900; letter-spacing: 0.12em; }
.board-row .sc { color: var(--ink); font-weight: 700; }
.board-row .tm { color: var(--muted); text-align: right; }
.board-empty, .board-loading, .board-error {
  padding: 24px 16px; text-align: center; color: var(--muted);
}
.board-actions .btn { margin: 6px 0; }

@media (max-width: 420px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid-3 { grid-template-columns: repeat(3, 1fr); }
  .board-row {
    grid-template-columns: 36px 52px 1fr 64px;
    font-size: 0.85rem; padding: 9px 8px;
  }
  #initials-input { width: 96px; }
}

@media (min-width: 600px) {
  .app { padding: 24px 20px 56px; }
  .hero-card, .quiz-card, .results-card, .board-card { padding: 28px 28px 30px; }
}

/* Share row */
.share-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  margin-top: 16px; padding-top: 14px;
  border-top: 1px solid rgba(120, 180, 255, 0.15);
}
.results-share { margin-bottom: 8px; }
.share-label {
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); font-weight: 700; margin-right: 4px;
}
.share-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 36px; padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(77, 225, 255, 0.08);
  color: var(--cyan); font-size: 0.85rem; font-weight: 700;
  text-decoration: none; cursor: pointer;
  font-family: var(--font);
}
.share-btn:hover { background: rgba(77, 225, 255, 0.18); color: #fff; }
.share-btn-copy { color: var(--amber); border-color: rgba(255, 193, 77, 0.4); }

/* Space calculator */
.calc-label {
  display: block; margin: 14px 0 6px;
  font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--cyan); font-weight: 700;
}
.calc-select, .calc-input {
  width: 100%; min-height: 48px;
  border-radius: 12px; border: 1px solid var(--line);
  background: #0a1020; color: var(--ink);
  padding: 10px 12px; font-size: 1rem; font-family: var(--font);
}
.calc-select:focus, .calc-input:focus {
  outline: none; box-shadow: 0 0 0 3px rgba(77, 225, 255, 0.3);
}
.custom-speed-row { margin-bottom: 4px; }
.sres {
  margin-top: 18px; padding: 16px;
  border-radius: 14px; border: 1px solid rgba(77, 225, 255, 0.28);
  background: rgba(0, 0, 0, 0.35);
}
.sres[hidden] { display: none !important; }
.sres-ttl {
  font-weight: 800; color: var(--amber); margin-bottom: 10px;
  font-size: 1.05rem;
}
.sstat {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 8px 0; border-bottom: 1px solid rgba(120, 180, 255, 0.12);
  font-size: 0.95rem;
}
.sstat:last-of-type { border-bottom: none; }
.sslbl { color: var(--muted); flex-shrink: 0; }
.ssval { font-weight: 700; text-align: right; font-family: var(--mono); font-size: 0.9rem; }
.ssval.go { color: var(--good); }
.ssval.cy { color: var(--cyan); }
.ssval.rr { color: var(--magenta); }
.exp-box {
  margin-top: 12px; padding: 12px;
  border-radius: 12px; background: rgba(77, 225, 255, 0.06);
  border: 1px solid rgba(77, 225, 255, 0.18);
}
.exp-ttl { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--cyan); font-weight: 700; margin-bottom: 6px; }
.exp-txt { color: var(--ink); font-size: 0.95rem; line-height: 1.5; }
.calc-nav { display: grid; gap: 0; margin-top: 8px; }
.calc-nav .btn { margin: 6px 0; }
.intel-block { margin-top: 22px; }
.intel-title {
  font-size: 0.95rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--cyan); margin: 0 0 12px;
}
.dcard {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 14px 16px; margin-bottom: 10px;
}
.dcard-name { font-weight: 800; color: var(--amber); margin-bottom: 4px; }
.dcard-dist { font-size: 0.85rem; color: var(--cyan); margin-bottom: 6px; font-family: var(--mono); }
.dcard-fact { font-size: 0.92rem; color: var(--muted); line-height: 1.45; }

a.btn {
  display: block; text-align: center; text-decoration: none;
  box-sizing: border-box;
}