:root {
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: #ffffff;
  --border: rgba(19, 52, 107, 0.14);
  --border-strong: rgba(19, 52, 107, 0.25);
  --text: #16213c;
  --text-soft: #55637d;
  --primary: #1447a6;
  --primary-soft: #e2ecff;
  --shadow: 0 20px 50px rgba(15, 44, 92, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  display: flex;
  flex-direction: column;
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI Variable", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(20, 71, 166, 0.12), transparent 36%),
    radial-gradient(circle at top right, rgba(97, 150, 255, 0.18), transparent 32%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
}

.page-shell {
  flex: 1;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 22px;
  display: grid;
  grid-template-columns: minmax(360px, 430px) minmax(0, 1fr);
  grid-template-areas:
    "hero hero"
    "controls output"
    "note note";
  gap: 14px;
  align-content: start;
}

.support-footer {
  display: flex;
  justify-content: center;
  padding: 0 16px 18px;
}

.hero {
  grid-area: hero;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  margin-bottom: 0;
}

.hero__copy {
  flex: 1;
  min-width: 0;
  max-width: none;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 2.75vw, 2.65rem);
  line-height: 1.02;
}

h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

.lead {
  margin: 0;
  max-width: none;
  color: var(--text-soft);
  font-size: 0.94rem;
}

.panel {
  padding: 18px;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.panel--controls {
  grid-area: controls;
}

.settings-stack {
  display: grid;
  gap: 12px;
}

.settings-group {
  display: grid;
  gap: 8px;
}

.settings-group + .settings-group {
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.settings-group__title {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.controls-grid--practice {
  grid-template-columns: 1fr 1fr 2fr;
  align-items: end;
}

.controls-grid--answer {
  grid-template-columns: minmax(170px, 1fr) minmax(0, 1fr);
  align-items: end;
}

.controls-grid--practice .field input,
.controls-grid--practice .checkbox-label--compact,
.controls-grid--answer .field input,
.controls-grid--answer .checkbox-label--compact {
  height: 42px;
}

.controls-grid--audio {
  grid-template-columns: minmax(0, 2fr) minmax(88px, 1fr) minmax(88px, 1fr);
  align-items: end;
}

.field {
  display: grid;
  gap: 6px;
}

.field--full {
  grid-column: 1 / -1;
}

.field--voice {
  min-width: 0;
}

label,
.field__label {
  font-size: 0.88rem;
  font-weight: 700;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-strong);
  color: var(--text);
}

input[type="number"] {
  text-align: center;
}

input:disabled,
select:disabled {
  background: rgba(107, 122, 145, 0.12);
  border-color: rgba(107, 122, 145, 0.2);
  color: var(--text-soft);
  cursor: not-allowed;
}

input:focus,
select:focus,
button:focus {
  outline: 2px solid rgba(20, 71, 166, 0.18);
  outline-offset: 2px;
  border-color: var(--border-strong);
}

.checkbox-label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  height: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.75);
  font-weight: 400;
  font-size: 0.92rem;
  line-height: 1.35;
}

.checkbox-label--compact {
  height: auto;
  min-height: 42px;
  align-items: center;
  padding: 8px 10px;
  font-size: 0.88rem;
  line-height: 1.2;
}

.checkbox-label span {
  display: block;
}

.checkbox-label input {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  min-height: unset;
  margin-top: 2px;
  padding: 0;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

button {
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
  font-size: 0.95rem;
}

button:hover:enabled {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(20, 71, 166, 0.12);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

#startBtn {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}

.language-switcher {
  display: grid;
  gap: 8px;
  min-width: 180px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
}

.language-switcher__label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-soft);
}

.language-switcher__buttons {
  display: flex;
  gap: 8px;
}

.language-btn {
  flex: 1;
  min-height: 38px;
  padding: 8px 10px;
}

.language-btn.is-active {
  background: var(--primary-soft);
  border-color: rgba(20, 71, 166, 0.3);
  color: var(--primary);
}

.language-switcher--footer {
  display: none;
}

.panel--output {
  grid-area: output;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.page-note {
  grid-area: note;
  margin: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
  line-height: 1.5;
}

.status-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.status-chip {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 6px 11px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 700;
}

#status {
  min-height: 26px;
  margin: 6px 0 8px;
  font-size: 0.98rem;
  color: var(--primary);
  font-weight: 700;
}

#scenarioTitle {
  margin: 8px 0 2px;
  min-height: 34px;
  font-size: clamp(1.35rem, 2.3vw, 1.8rem);
  font-weight: 800;
}

#scenarioIntro {
  min-height: 22px;
  margin-bottom: 10px;
  color: var(--text-soft);
  font-size: 0.95rem;
}

#sentence {
  min-height: 72px;
  margin: 12px 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
}

.answer-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 8px;
}

#nextBtn {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}

.small {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.86rem;
}

@media (max-width: 980px) {
  .page-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "hero"
      "controls"
      "output"
      "note";
    min-height: auto;
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero .language-switcher {
    display: none;
  }

  .language-switcher--footer {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
    width: auto;
    gap: 4px;
    padding: 8px 10px;
  }

  .support-footer {
    justify-content: center;
    gap: 12px;
    align-items: stretch;
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: min(100% - 20px, 1180px);
    padding: 14px 0 20px;
  }

  .panel {
    padding: 16px;
    border-radius: 18px;
  }

  #sentence {
    min-height: 60px;
  }

  .language-btn {
    font-size: 0;
  }

  .language-btn[data-language="ja"]::after {
    content: "JA";
    font-size: 0.95rem;
  }

  .language-btn[data-language="en"]::after {
    content: "EN";
    font-size: 0.95rem;
  }
}