:root {
  --bg: #0f172a;
  --card: #1e293b;
  --card2: #334155;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #22c55e;
  --accent2: #38bdf8;
  --gold: #fbbf24;
  --danger: #f87171;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, #14532d55, transparent),
    radial-gradient(900px 500px at 100% 0%, #0ea5e955, transparent),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.wrap { max-width: 1100px; margin: 0 auto; padding: 24px 16px 80px; }

header {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

.brand h1 { font-size: 1.7rem; letter-spacing: 0.3px; }
.brand p { color: var(--muted); margin-top: 4px; }

.search {
  flex: 1;
  min-width: 240px;
  max-width: 420px;
  position: relative;
}

.search input {
  width: 100%;
  padding: 12px 14px 12px 40px;
  border: 1px solid #475569;
  border-radius: 12px;
  background: #0b1220;
  color: var(--text);
  font-size: 1rem;
}

.search span {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
}

.toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.btn {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
  background: var(--card2);
  color: var(--text);
}

.btn.primary { background: var(--accent); color: #052e16; }
.btn.sky { background: var(--accent2); color: #082f49; }
.btn.gold { background: var(--gold); color: #422006; }

.cats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 12px;
}

.cat {
  background: var(--card);
  border: 1px solid #334155;
  border-radius: 16px;
  padding: 16px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s;
}

.cat:hover { transform: translateY(-3px); border-color: var(--accent); }
.cat .icon { font-size: 1.6rem; }
.cat h3 { margin: 8px 0 4px; font-size: 1rem; }
.cat small { color: var(--muted); }

.panel { display: none; }
.panel.show { display: block; }

.back {
  margin-bottom: 14px;
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.card {
  background: var(--card);
  border: 1px solid #334155;
  border-radius: 14px;
  padding: 14px;
}

.card .sw { font-size: 1.25rem; color: var(--accent); font-weight: 700; }
.card .so { margin-top: 6px; font-size: 1.05rem; }
.card .en { color: var(--muted); font-size: 0.9rem; margin-top: 4px; }
.card .pr {
  margin-top: 10px;
  color: var(--gold);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.speak {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: #0b1220;
  cursor: pointer;
  flex-shrink: 0;
}

.speak svg { width: 22px; height: 22px; display: block; }
.speak:hover { background: #14532d; }
.speak.playing { background: #0369a1; }

.flash {
  max-width: 480px;
  margin: 30px auto;
  text-align: center;
}

.flash-card {
  background: linear-gradient(180deg, #1e293b, #0f172a);
  border: 1px solid #475569;
  border-radius: 20px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.flash-card .big { font-size: 2rem; color: var(--accent); }
.flash-nav { display: flex; justify-content: center; gap: 10px; margin-top: 16px; }

.quiz-box {
  max-width: 560px;
  margin: 20px auto;
  background: var(--card);
  border-radius: 16px;
  padding: 22px;
}

.choices { display: grid; gap: 10px; margin-top: 16px; }
.choice {
  background: #0b1220;
  border: 1px solid #475569;
  color: var(--text);
  padding: 12px;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
}
.choice.good { border-color: var(--accent); background: #14532d55; }
.choice.bad { border-color: var(--danger); background: #7f1d1d55; }

.score { color: var(--muted); margin-top: 12px; }

@media (max-width: 600px) {
  .brand h1 { font-size: 1.35rem; }
  .flash-card .big { font-size: 1.5rem; }
}