* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #f4f4f4;
  color: #222;
}

header, main { max-width: 960px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 24px; }
h1 { margin: 0 0 4px; font-size: 1.6rem; }
.sub { margin: 0 0 16px; color: #555; }

.progress { display: flex; align-items: center; gap: 12px; }
.bar { flex: 1; height: 8px; background: #ddd; border-radius: 4px; overflow: hidden; }
#bar-fill { height: 100%; width: 0; background: #2aa84a; transition: width .3s; }
#score { font-size: .9rem; color: #555; white-space: nowrap; }

.rule { margin: 12px 0 8px; font-size: .95rem; color: #444; }
.rule summary { cursor: pointer; color: #2a6fb0; }

button.link { background: none; border: 0; color: #2a6fb0; cursor: pointer; font: inherit; font-size: .9rem; padding: 0; }
button.link:hover { text-decoration: underline; }

#topics {
  max-width: 960px; margin: 8px auto 0; padding: 0 20px;
  display: flex; flex-wrap: wrap; gap: 8px;
}
.topic {
  font: inherit; font-size: .9rem; cursor: pointer;
  background: #fff; border: 1px solid #cfd8e3; border-radius: 16px;
  padding: 5px 12px; color: #333;
}
.topic small { margin-left: 6px; color: #888; }
.topic.current { background: #2a6fb0; border-color: #2a6fb0; color: #fff; }
.topic.current small { color: #dce8f5; }

.group { margin: 36px 0 0; padding-bottom: 6px; border-bottom: 2px solid #dfe5ec; }
.group h2 { margin: 0; font-size: 1.15rem; color: #2a6fb0; }
.group p { margin: 2px 0 0; font-size: .9rem; color: #666; }

.exercise { margin: 22px 0; }

.parts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; align-items: center; }
.part {
  background: #fff;
  border: 1px solid #cfd8e3;
  border-radius: 6px;
  padding: 3px 8px;
  font-weight: 600;
}
.sep { color: #999; }

.w { cursor: pointer; border-radius: 3px; }
.w:hover, .w.active { background: #fff3b0; }

.row { display: flex; align-items: center; gap: 10px; }
.row input {
  flex: 1;
  font: inherit;
  font-size: 1.05rem;
  padding: 10px 12px;
  background: #e9ecef;
  border: 1px solid #8fb6dd;
  border-radius: 4px;
  color: #333;
}
.row input:focus { outline: 2px solid #8fb6dd; background: #fff; }
.speak {
  background: none; border: 0; padding: 0 2px; cursor: pointer;
  font-size: 1.1rem; line-height: 1; opacity: .8;
}
.speak:hover:not(:disabled) { opacity: 1; transform: scale(1.1); }
.speak:disabled { cursor: not-allowed; opacity: .25; filter: grayscale(1); }
#info h2 .speak { font-size: 1rem; vertical-align: middle; }
.no-voice .speak { display: none; }

.check {
  font: inherit; font-size: .95rem; font-weight: 600; cursor: pointer;
  padding: 10px 16px; border: 0; border-radius: 4px;
  background: #2a6fb0; color: #fff;
}
.check:hover { background: #235d94; }
.check:focus-visible { outline: 2px solid #8fb6dd; outline-offset: 2px; }

.mark { width: 20px; font-size: 1.2rem; font-weight: bold; text-align: center; }
.mark.ok { color: #2aa84a; }
.mark.bad { color: #d0342c; }

.feedback { margin-top: 6px; font-size: .95rem; color: #444; }
.feedback .answer { font-weight: 600; }
.feedback .tools { margin-top: 4px; display: flex; flex-wrap: wrap; gap: 4px 14px; }
.feedback .hint { color: #555; font-style: italic; flex-basis: 100%; }

/* Word info panel */
#info {
  position: absolute;
  z-index: 10;
  width: 340px;
  max-height: 60vh;
  overflow: auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0,0,0,.18);
  padding: 16px 18px;
}
#info-close {
  position: absolute; top: 6px; right: 10px;
  background: none; border: 0; font-size: 1.4rem; cursor: pointer; color: #888;
}
#info h2 { margin: 0 0 2px; font-size: 1.3rem; }
#info .type { color: #777; font-size: .85rem; margin-bottom: 8px; }
#info .en { font-size: 1.05rem; margin-bottom: 8px; }
#info .tag {
  display: inline-block; padding: 1px 8px; border-radius: 10px;
  font-size: .8rem; font-weight: 700; margin-right: 6px; color: #fff;
}
#info .tag.de { background: #2a6fb0; }
#info .tag.het { background: #c0762b; }
#info table { border-collapse: collapse; font-size: .9rem; margin: 6px 0; }
#info td { padding: 1px 10px 1px 0; }
#info td:first-child { color: #777; }
#info ul { margin: 6px 0 0; padding-left: 18px; font-size: .9rem; }
#info .meta { font-size: .9rem; margin: 4px 0; }

@media (max-width: 600px) {
  #info { position: fixed; top: auto; left: 10px; right: 10px; bottom: 10px; width: auto; }
}