:root {
  --bg: #edf3ff;
  --bg-2: #f8fbff;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #dbe7fa;
  --brand: #2f55ff;
  --brand-2: #1299b5;
  --ok: #0f9f66;
  --ok-bg: #e9fff4;
  --bad: #dc2626;
  --bad-bg: #fff1f1;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: "Segoe UI", "Inter", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 5% 0%, #d9e6ff 0%, transparent 32%),
    radial-gradient(circle at 95% 100%, #daf7ff 0%, transparent 35%),
    var(--bg);
}
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 26px 18px 110px;
}
.topbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.top-link {
  text-decoration: none;
  color: #1d4ed8;
  font-weight: 800;
  font-size: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px 14px;
}
.top-link:hover {
  color: #1e40af;
}
.hero {
  background: linear-gradient(135deg, #fff 0%, var(--bg-2) 100%);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 12px 34px rgba(45, 85, 255, 0.08);
  padding: 22px;
  margin-bottom: 16px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(34px, 4vw, 46px);
  line-height: 1.1;
  font-weight: 900;
}
.hero h2 {
  margin: 8px 0 6px;
  color: var(--brand);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  font-weight: 900;
}
.hero p {
  margin: 4px 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.45;
}
.audio-wrap {
  margin-top: 12px;
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
audio {
  width: min(560px, 100%);
}
.section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  margin-bottom: 12px;
}
.section h3 {
  margin: 0 0 10px;
  font-size: 24px;
  font-weight: 900;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.section h3::before {
  content: "";
  width: 8px;
  height: 24px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--brand), var(--brand-2));
}
.line {
  margin: 0 0 8px;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 21px;
  line-height: 1.6;
}
.line:hover {
  background: #f8fbff;
}
.qnum {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: #e6eeff;
  color: #1e40af;
  font-weight: 900;
  font-size: 18px;
  margin: 0 4px;
  vertical-align: middle;
}
.ans-input {
  width: 190px;
  max-width: 44vw;
  border: 1px solid #bfd2f7;
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 18px;
  margin: 0 6px;
  vertical-align: middle;
  background: #fff;
}
.ans-input:focus {
  outline: none;
  border-color: #4f73ff;
  box-shadow: 0 0 0 3px rgba(79, 115, 255, 0.16);
}
.ans-input.ok {
  border-color: var(--ok);
  background: var(--ok-bg);
  color: #166534;
}
.ans-input.bad {
  border-color: var(--bad);
  background: var(--bad-bg);
  color: #7f1d1d;
}
.feedback {
  margin-left: 4px;
  font-size: 14px;
  font-weight: 900;
  text-transform: uppercase;
  vertical-align: middle;
}
.feedback.ok {
  color: var(--ok);
}
.feedback.bad {
  color: var(--bad);
}
.correct {
  margin-left: 8px;
  color: var(--ok);
  font-weight: 900;
  font-size: 14px;
  vertical-align: middle;
}
.floating-actions {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(8px);
  z-index: 30;
}
.floating-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.btn {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}
.btn-submit {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  box-shadow: 0 8px 20px rgba(47, 85, 255, 0.25);
}
.btn-reset {
  background: #e2e8f0;
  color: var(--text);
}
.score-box {
  margin-left: auto;
  font-size: 18px;
  font-weight: 900;
  color: #0f172a;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 10px;
  padding: 8px 12px;
}
.page-nav {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 14px 0 0;
  flex-wrap: wrap;
}
.nav-btn {
  text-decoration: none;
  border-radius: 10px;
  font-weight: 800;
  padding: 9px 14px;
  border: 1px solid #bfd2f7;
  color: #1d4ed8;
  background: #fff;
}
.nav-btn.primary {
  border: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}
@media (max-width: 780px) {
  .line {
    font-size: 18px;
  }
  .qnum {
    width: 27px;
    height: 27px;
    font-size: 16px;
  }
  .ans-input {
    width: 150px;
    font-size: 16px;
  }
  .score-box {
    margin-left: 0;
  }
}