/* ── Design Tokens ──────────────────────────────────────────────── */
:root {
  /* Colors */
  --color-bg:          #f2f2f7;
  --color-surface:     #ffffff;
  --color-surface-2:   #f9f9fb;
  --color-primary:     #007aff;
  --color-primary-dk:  #005ecb;
  --color-green:       #34c759;
  --color-green-dk:    #248a3d;
  --color-red:         #ff3b30;
  --color-red-dk:      #c0392b;
  --color-text:        #1c1c1e;
  --color-text-2:      #3a3a3c;
  --color-muted:       #8e8e93;
  --color-border:      #d1d1d6;
  --color-overlay-g:   rgba(52, 199, 89, 0.88);
  --color-overlay-r:   rgba(255, 59, 48, 0.88);

  /* Spacing */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;

  /* Radii */
  --r-sm:  8px;
  --r-md:  14px;
  --r-lg:  20px;
  --r-xl:  28px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0,0,0,0.10), 0 1px 4px rgba(0,0,0,0.06);
  --shadow-btn:  0 2px 8px rgba(0,0,0,0.10);

  /* Typography */
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
}

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

html, body {
  height: 100%;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Screens ────────────────────────────────────────────────────── */
.screen {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--sp-6) var(--sp-4) var(--sp-10);
}

.screen[hidden] { display: none; }

/* ── Home Layout ────────────────────────────────────────────────── */
.home-layout {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

.app-header { text-align: center; padding-top: var(--sp-8); }

.app-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text);
}

.app-subtitle {
  margin-top: var(--sp-2);
  font-size: 1rem;
  color: var(--color-muted);
}

/* ── Start Form ─────────────────────────────────────────────────── */
.start-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.field-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-2);
  letter-spacing: 0.01em;
}

.text-input {
  width: 100%;
  padding: var(--sp-4);
  font-size: 1rem;
  font-family: var(--font);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.15s;
}

.text-input:focus { border-color: var(--color-primary); }

.field-error {
  font-size: 0.85rem;
  color: var(--color-red);
  margin-top: calc(-1 * var(--sp-1));
}

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4) var(--sp-6);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  box-shadow: var(--shadow-btn);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.btn:active { opacity: 0.85; transform: scale(0.97); }

.btn-primary    { background: var(--color-primary); color: #fff; width: 100%; }
.btn-secondary  { background: var(--color-surface); color: var(--color-primary); border: 1.5px solid var(--color-border); width: 100%; }
.btn-returnable { background: var(--color-green);   color: #fff; flex: 1; }
.btn-trash      { background: var(--color-red);     color: #fff; flex: 1; }

/* ── Quiz Layout ────────────────────────────────────────────────── */
.quiz-layout {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-6);
}

.quiz-header {
  width: 100%;
  text-align: center;
  padding-top: var(--sp-6);
}

.progress-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0.05em;
}

/* ── Quiz Card ──────────────────────────────────────────────────── */
.card-area { width: 100%; display: flex; justify-content: center; }

.quiz-card {
  position: relative;
  width: min(340px, 90vw);
  aspect-ratio: 3/4;
  background: var(--color-surface);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  cursor: grab;
  will-change: transform;
  touch-action: none;
  transition: transform 0.28s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              box-shadow 0.28s ease;
  user-select: none;
  -webkit-user-select: none;
}

.quiz-card.dragging  { transition: none; cursor: grabbing; }
.quiz-card.dismissing {
  transition: transform 0.35s ease-in, opacity 0.35s ease-in;
}

.card-image {
  width: 100%;
  height: 85%;
  object-fit: contain;
  padding: var(--sp-6);
  pointer-events: none;
}

.card-brand {
  padding: 0 var(--sp-5) var(--sp-4);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-2);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Swipe Indicators ───────────────────────────────────────────── */
.indicator {
  position: absolute;
  top: var(--sp-6);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-sm);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  opacity: 0;
  pointer-events: none;
  z-index: 2;
}

.indicator-left  { left: var(--sp-4);  background: var(--color-green); color: #fff; transform: rotate(-15deg); }
.indicator-right { right: var(--sp-4); background: var(--color-red);   color: #fff; transform: rotate(15deg); }

/* ── Quiz Actions ───────────────────────────────────────────────── */
.quiz-actions {
  width: min(340px, 90vw);
  display: flex;
  gap: var(--sp-3);
}

/* ── Feedback Panel ─────────────────────────────────────────────── */
.feedback-panel {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
}

.feedback-panel[hidden] { display: none; }

.feedback-card {
  background: var(--color-surface);
  border-radius: var(--r-xl) var(--r-xl) 0 0;
  padding: var(--sp-8) var(--sp-6) var(--sp-10);
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  animation: slide-up 0.25s ease-out;
}

@keyframes slide-up {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.feedback-icon  { font-size: 2.5rem; text-align: center; color: var(--color-red); }
.feedback-card--correct .feedback-icon { color: var(--color-green); }
.feedback-hint  { font-size: 1rem; color: var(--color-text); line-height: 1.6; text-align: center; }
.feedback-correct { font-size: 0.9rem; color: var(--color-muted); text-align: center; font-style: italic; }

/* ── Correct Flash ──────────────────────────────────────────────── */
.correct-flash {
  position: fixed;
  inset: 0;
  background: var(--color-overlay-g);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fade-in-out 1.1s ease forwards;
  pointer-events: none;
}

.correct-flash[hidden] { display: none; }

@keyframes fade-in-out {
  0%   { opacity: 0; }
  20%  { opacity: 1; }
  75%  { opacity: 1; }
  100% { opacity: 0; }
}

.correct-label {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

/* ── Result Layout ──────────────────────────────────────────────── */
.result-layout {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-8);
  padding-top: var(--sp-10);
}

.result-card {
  background: var(--color-surface);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-card);
  padding: var(--sp-10) var(--sp-8);
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.result-player  { font-size: 1rem; color: var(--color-muted); }

.result-score {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-text);
}

.result-comment { font-size: 1rem; color: var(--color-text-2); }

.result-actions {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

/* ── Scoreboard ─────────────────────────────────────────────────── */
.scoreboard-wrapper { width: 100%; }

.scoreboard-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--sp-3);
}

.scoreboard {
  background: var(--color-surface);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.scoreboard-empty {
  padding: var(--sp-8) var(--sp-4);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.scoreboard-row {
  display: flex;
  align-items: center;
  padding: var(--sp-4) var(--sp-5);
  gap: var(--sp-4);
  border-bottom: 1px solid var(--color-border);
}

.scoreboard-row:last-child { border-bottom: none; }

.scoreboard-rank {
  width: 24px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-muted);
  text-align: center;
  flex-shrink: 0;
}

.scoreboard-rank.rank-1 { color: #f5a623; }
.scoreboard-rank.rank-2 { color: #b0b0b8; }
.scoreboard-rank.rank-3 { color: #a0522d; }

.scoreboard-name {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.scoreboard-score {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  flex-shrink: 0;
}