:root{
  --bg-start: #ff9ecf;
  --bg-mid:   #ff6fb3;
  --bg-end:   #ff3d9b;
  --text:     #1a1a1a;
  --muted:    #5c5c5c;
  --card-bg:  rgba(255,255,255,0.92);
  --radius:   22px;
  --shadow:   0 14px 38px rgba(0,0,0,0.18);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-start) 0%, var(--bg-mid) 50%, var(--bg-end) 100%);
  display: grid;
  place-items: center;
}
.container {
  width: min(980px, 94vw);
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(6px);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(18px, 4vw, 42px);
  text-align: center;
}
.logo{
  width: clamp(140px, 26vw, 240px);
  height: auto;
  display:block;
  margin: 0 auto 10px;
  filter: drop-shadow(0 6px 14px rgba(0,0,0,0.12));
  border-radius: 14px;
}
h1{ margin: 6px 0 6px; font-size: clamp(26px, 4.4vw, 40px); }
p.lead { margin: 0.2rem 0 1.2rem; font-size: clamp(16px, 2.1vw, 18px); color: var(--muted); }
.flashcard {
  width: min(760px, 90vw);
  height: clamp(220px, 36vw, 320px);
  background: var(--card-bg);
  border-radius: 24px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
  display: grid;
  place-items: center;
  margin: 14px auto;
  padding: clamp(16px, 3vw, 28px);
  overflow: hidden;
}
.word {
  font-size: clamp(36px, 6.4vw, 64px);
  font-weight: 800;
  letter-spacing: .3px;
  line-height: 1.08;
  margin: 0;
}
.translation {
  font-size: clamp(16px, 2.2vw, 22px);
  color: var(--muted);
  margin-top: 8px;
}
.fade { animation: fadeIn .45s ease both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px);} to { opacity:1; transform: translateY(0);} }
.controls { margin-top: 10px; font-size: 14px; color: #333; opacity: .85; }
.footer { margin-top: 16px; font-size: 13px; color: #444; opacity: .8; }