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

:root {
  --bg: #f5ede8;
  --fg: #1a1410;
  --accent: #FA3B51;
  --muted: #8a7f72;
  --card-bg: #faf7f2;
}

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: 'Work Sans', monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background-image: 
    radial-gradient(ellipse at 20% 50%, rgba(196,82,42,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(212,168,67,0.08) 0%, transparent 50%);
}

header {
  text-align: center;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

header h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: -0.02em;
  line-height: 1;
  font-weight: 300;
}

header h1 span {
  color: var(--accent);
  font-weight: bold;
}

header p {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

a:link, a:visited {
  color: black;
}

/* String selector */
.string-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.selector-label {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.string-buttons {
  display: flex;
  gap: 0.5rem;
}

.string-btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid rgba(26,20,16,0.2);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  transition: all 0.2s;
  letter-spacing: 0;
}

.string-btn:hover {
  border-color: var(--fg);
  color: var(--fg);
}

.string-btn.active {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--bg);
  box-shadow: 0 2px 8px rgba(26,20,16,0.2);
}

.string-btn.active:hover {
  background: #2d2520;
}

.no-strings-msg {
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  min-height: 1em;
}

.scene {
  width: 340px;
  height: 280px;
  perspective: 1000px;
  cursor: pointer;
}

.card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 16px;
  background: var(--card-bg);
  border: 1.5px solid rgba(26,20,16,0.12);
  box-shadow: 
    0 4px 6px rgba(26,20,16,0.06),
    0 12px 32px rgba(26,20,16,0.1),
    inset 0 1px 0 rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  overflow: hidden;
}

.card-face::before {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: 11px;
  border: 1px solid rgba(26,20,16,0.06);
  pointer-events: none;
}

.card-back {
  transform: rotateY(180deg);
}

.note-label {
  font-size: 5.5rem;
  font-weight: 700;
  color: var(--fg);
  line-height: 1;
}

.note-sublabel {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.5rem;
}

#vex-container svg {
  display: block;
}

.corner-tag {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.6;
}

.controls {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  align-items: center;
}

button {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--fg);
  color: var(--bg);
}

.btn-primary:hover {
  background: #2d2520;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,20,16,0.25);
}

.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--muted);
  border: 1.5px solid rgba(26,20,16,0.15);
}

.btn-secondary:hover {
  border-color: var(--fg);
  color: var(--fg);
}

footer {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 1.5rem;
  text-align: center;
}

.counter {
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  margin-top: 1.5rem;
}

.counter span {
  color: var(--accent);
  font-weight: 400;
}

.flip-hint {
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 1rem;
  opacity: 0.7;
  transition: opacity 0.3s;
}

.flip-hint.hidden { opacity: 0; }

/* Score bar */
.score-row {
  display: flex;
  gap: 2rem;
  margin-top: 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-transform: uppercase;
}

.score-row b { color: var(--fg); }
.score-row .correct b { color: #4a7c59; }
.score-row .wrong b { color: var(--accent); }