*{box-sizing:border-box}body{margin:0;background:#f6f7f5;color:#202522;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;line-height:1.8}.wrap{max-width:980px;margin:auto;padding:0 22px}header{background:#17231d;color:#fff;padding:24px 0}.brand{color:#fff;text-decoration:none;font-weight:800;letter-spacing:.08em}.topbar{display:flex;justify-content:space-between}.topbar a:last-child{color:#dfe9e1}.hero{padding:70px 0 35px}.hero h1{font-size:48px;line-height:1.1;margin:10px 0}.eyebrow,.hero span{color:#567560;font-weight:800;font-size:12px;letter-spacing:.1em}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;padding-bottom:50px}.card,.panel{background:#fff;border:1px solid #e2e6e2;border-radius:16px}.card{padding:22px;text-decoration:none;color:inherit}.card:hover{transform:translateY(-3px);box-shadow:0 10px 28px #1a2b1a18}.lesson{padding-top:42px;padding-bottom:60px}.panel{padding:25px;margin:18px 0}.english,.slash-text{font-family:Georgia,"Times New Roman",serif;font-size:18px}.lead,.chunk{background:#eef5ef;padding:12px;border-radius:10px}.quiz,.guide{padding:16px 0;border-bottom:1px solid #e8ece8}.options{display:grid;gap:8px}.option{background:#fff;border:1px solid #d9dfd9;border-radius:10px;padding:13px 15px;text-align:left;font:inherit;cursor:pointer}.option.correct{background:#e8f5eb;border-color:#5e9b6b}.option.wrong{background:#fbe9e9;border-color:#c46a6a}.result{display:none;margin-top:14px;padding:15px;border-radius:10px}.result.ok,.result.ng{display:block}.result.ok{background:#eef8ef}.result.ng{background:#fff1f1}.sentence{margin:12px 0;border:1px solid #dfe5df;border-radius:12px;overflow:hidden}.sentence summary{cursor:pointer;padding:16px;font-family:Georgia,serif}.inside{padding:16px}.note{padding:12px;border-left:4px solid #9aae9f;background:#f7f8f7;margin:8px 0}.slash-text{background:#f1f5f1;padding:22px;border-radius:12px;line-height:2.2}.vocab{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:8px}.vocab div{background:#f3f5f3;padding:10px;border-radius:8px}.audio select{max-width:320px;padding:8px}.audio button{padding:9px 14px;margin:4px;border:0;border-radius:8px;background:#20392a;color:#fff}@media(max-width:600px){.hero h1{font-size:34px}.panel{padding:18px}}
.voice-select {
  width: 460px;
  max-width: 100%;
  box-sizing: border-box;
}

/* 本文のそばで音声を操作できる読書レイアウト */
.reading-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  align-items: start;
  gap: 18px;
  margin: 18px 0;
}

.reading-layout .panel {
  margin: 0;
}

.reading-audio-panel {
  position: sticky;
  top: 16px;
}

.reading-audio-panel h2 {
  font-size: 1.2rem;
  line-height: 1.4;
}

.reading-audio-panel .voice-select {
  width: 100%;
}

.reading-audio-panel .audio-buttons {
  display: flex;
  flex-wrap: wrap;
}

.ios-system-reading {
  margin-bottom: 20px;
  padding: 14px;
  border: 1px solid #b9d3bd;
  border-radius: 10px;
  background: #eef8ef;
}

.ios-system-reading h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.ios-system-reading p {
  margin: 8px 0;
  font-size: .9rem;
  line-height: 1.65;
}

.ios-guide {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid #cfe1d1;
}

.ios-reading-mode[hidden] {
  display: none;
}

.ios-reading-mode {
  position: fixed;
  z-index: 10;
  inset: 0;
  overflow-y: auto;
  background: #f6f7f5;
}

.ios-reading-mode-open {
  overflow: hidden;
}

.ios-reading-toolbar {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 12px 18px;
  text-align: right;
  border-bottom: 1px solid #e2e6e2;
  background: #f6f7f5;
}

.ios-reading-sheet {
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 22px 56px;
}

.ios-reading-instruction {
  margin: 0 0 22px;
  padding: 12px;
  border-radius: 10px;
  background: #eef5ef;
  font-size: .95rem;
}

#ios-reading-content {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  line-height: 2;
}

#ios-reading-content .slash-text {
  padding: 0;
  background: transparent;
}

@media (max-width: 720px) {
  .reading-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .reading-audio-panel {
    position: static;
    display: contents;
  }

  .reading-audio-panel > #web-audio-english,
  .reading-audio-panel > #web-audio-slash {
    display: contents;
  }

  .reading-layout .audio-quick-controls {
    position: sticky;
    z-index: 2;
    top: 8px;
    order: -3;
    padding: 12px 14px;
    border: 1px solid #e2e6e2;
    border-radius: 16px;
    background: #fff;
    box-shadow: 0 6px 18px #1a2b1a18;
  }

  .audio-quick-controls label {
    display: block;
    margin-bottom: 4px;
    font-size: .85rem;
  }

  .audio-quick-controls .audio-buttons {
    margin-top: 8px;
  }

  .reading-text-panel {
    order: -2;
  }

  .reading-layout .audio-static,
  .reading-layout .audio-secondary {
    padding: 18px;
    border: 1px solid #e2e6e2;
    border-radius: 16px;
    background: #fff;
  }

  .reading-layout .audio-static {
    order: 0;
  }

  .reading-layout .audio-secondary {
    order: 1;
  }
}