:root {
  --text: #ffffff;
  --text-dim: rgba(255, 255, 255, 0.72);
  --accent: #6ea8ff;
  --correct: #2ecc71;
  --wrong: #e74c3c;
  --glass-bg: rgba(20, 22, 28, 0.42);
  --glass-border: rgba(255, 255, 255, 0.16);
  --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.4);
  --radius: 18px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.screen { position: fixed; inset: 0; }
.screen[hidden] { display: none; }

/* ============ Image background ============ */

.image-frame {
  position: absolute;
  inset: 0;
  background: #0a0a0a;
  overflow: hidden;
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  /* --hide-scale lo setea game.js por imagen (default 1.4286 = 30% oculto) */
  transform: scale(var(--hide-scale, 1.4286));
  transform-origin: top center;
  transition:
    opacity 380ms ease,
    transform 850ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

.image-frame.loaded img {
  opacity: 1;
}

.image-frame.revealed img {
  transform: scale(1);
}


/* Subtle vignette so UI text is readable on bright images */
.vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(to bottom, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0) 22%),
    linear-gradient(to top, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0) 28%);
}

/* ============ Top bar ============ */

.topbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  padding:
    calc(var(--safe-top) + 18px)
    clamp(16px, 4vw, 28px)
    14px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  z-index: 5;
  pointer-events: none;
}

.stats {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

.stat {
  display: inline-flex;
  align-items: baseline;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  text-shadow:
    0 2px 14px rgba(0, 0, 0, 0.85),
    0 0 4px rgba(0, 0, 0, 0.6);
}

.stat:first-child {
  font-size: clamp(2rem, 7vw, 2.6rem);
  line-height: 1;
}

.stat:last-child {
  font-size: clamp(1.1rem, 3.8vw, 1.4rem);
  line-height: 1;
  opacity: 0.85;
  font-weight: 700;
}

.stat:last-child::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 1em;
  margin-right: 14px;
  background: rgba(255, 255, 255, 0.35);
  transform: translateY(0.1em);
}

/* ============ Bottom controls ============ */

.controls {
  position: absolute;
  bottom: 15%;
  left: 0; right: 0;
  padding: 0 clamp(16px, 4vw, 28px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  z-index: 5;
  transition: opacity 260ms ease, transform 260ms ease;
}

.controls.hidden {
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
}

.btn {
  font: inherit;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  min-height: 60px;
  padding: 0 18px;
  color: var(--text);
  background: transparent;
  border: 2.5px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius);
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.85), 0 0 2px rgba(0, 0, 0, 0.6);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
  cursor: pointer;
  transition:
    background 220ms ease,
    border-color 220ms ease,
    color 220ms ease,
    text-shadow 220ms ease,
    box-shadow 220ms ease,
    transform 120ms ease,
    opacity 220ms ease;
}

.btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.9);
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
}

.btn:disabled { cursor: default; }

.btn-choice.correct {
  border-color: var(--correct);
  color: var(--correct);
  text-shadow:
    0 0 18px rgba(46, 204, 113, 0.8),
    0 2px 12px rgba(0, 0, 0, 0.7);
}

.btn-choice.wrong {
  border-color: var(--wrong);
  color: var(--wrong);
  text-shadow:
    0 0 18px rgba(231, 76, 60, 0.8),
    0 2px 12px rgba(0, 0, 0, 0.7);
}

.btn-choice.dimmed {
  opacity: 0.35;
  border-color: rgba(255, 255, 255, 0.25);
}

/* ============ Center result ============ */

.result-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 4;
  pointer-events: none;
}

.result-overlay[hidden] { display: none; }

.result-card {
  width: clamp(110px, 24vw, 150px);
  height: clamp(110px, 24vw, 150px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 17, 22, 0.18);
  backdrop-filter: blur(8px) saturate(130%);
  -webkit-backdrop-filter: blur(8px) saturate(130%);
  border: 3px solid transparent;
  transform: scale(0.6);
  opacity: 0;
  animation: result-pop 480ms cubic-bezier(0.22, 1.4, 0.36, 1) forwards;
}

@keyframes result-pop {
  0%   { transform: scale(0.6); opacity: 0; }
  55%  { transform: scale(1.12); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

.result-card.leaving {
  animation: result-leave 280ms cubic-bezier(0.4, 0, 1, 1) forwards;
}

@keyframes result-leave {
  0%   { transform: scale(1);    opacity: 1; }
  100% { transform: scale(0.75); opacity: 0; }
}

.result-icon {
  font-size: clamp(3.4rem, 13vw, 5rem);
  font-weight: 800;
  line-height: 1;
  text-shadow: 0 4px 14px rgba(0, 0, 0, 0.5);
}

.result-card.correct {
  border-color: var(--correct);
  box-shadow:
    0 0 60px rgba(46, 204, 113, 0.55),
    0 0 0 1px rgba(46, 204, 113, 0.25),
    0 16px 40px rgba(0, 0, 0, 0.4);
}

.result-card.correct .result-icon {
  color: var(--correct);
  text-shadow:
    0 0 28px rgba(46, 204, 113, 0.7),
    0 4px 18px rgba(0, 0, 0, 0.5);
}

.result-card.wrong {
  border-color: var(--wrong);
  box-shadow:
    0 0 60px rgba(231, 76, 60, 0.55),
    0 0 0 1px rgba(231, 76, 60, 0.25),
    0 16px 40px rgba(0, 0, 0, 0.4);
}

.result-card.wrong .result-icon {
  color: var(--wrong);
  text-shadow:
    0 0 28px rgba(231, 76, 60, 0.7),
    0 4px 18px rgba(0, 0, 0, 0.5);
}

/* ============ End / error screens ============ */

.overlay-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(80% 60% at 50% 30%, rgba(110, 168, 255, 0.18) 0%, rgba(0, 0, 0, 0) 60%),
    #0a0c12;
}

.end-card {
  max-width: 420px;
  width: 100%;
  padding: 32px 24px;
  background: rgba(20, 22, 28, 0.7);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  text-align: center;
  box-shadow: var(--shadow-soft);
}

.end-card h2 {
  margin: 0 0 16px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.big-percent {
  font-size: clamp(3rem, 14vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, #6ea8ff 0%, #b48cff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 8px 0 4px;
  line-height: 1;
}

.final-score {
  font-size: 1.05rem;
  margin: 4px 0 18px;
  color: var(--text);
}
.final-score strong { color: var(--accent); }

.best-score {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0 0 22px;
}
.best-score .dot { margin: 0 6px; opacity: 0.5; }

.btn-primary {
  width: 100%;
  background: var(--accent);
  color: #0a0c12;
  border-color: transparent;
}
.btn-primary:hover:not(:disabled) {
  background: #8cbcff;
  border-color: transparent;
}

.error-detail {
  color: var(--wrong);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  margin: 8px 0 14px;
}

.hint {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.5;
}

code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}