:root {
  /* Paleta KAI Strategy Lab */
  --bg-base: #0a1424;
  --bg-deep: #060d1a;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-strong: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  --text: #e8eef5;
  --muted: #8aa0bd;
  --muted-soft: #6e85a3;

  --accent: #3dd6a7;
  --accent-deep: #16a37b;
  --accent-soft: rgba(61, 214, 167, 0.14);
  --accent-text: #062019;

  --danger: #ef4444;
  --danger-deep: #7f1d1d;

  --shadow-card: 0 24px 60px rgba(0, 0, 0, 0.45);
  --shadow-button: 0 18px 50px rgba(61, 214, 167, 0.35);
  --shadow-button-danger: 0 18px 50px rgba(127, 29, 29, 0.45);

  --radius-xl: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  background: var(--bg-base);
}

body {
  margin: 0;
  min-height: 100svh;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(900px 600px at 50% -200px, rgba(61, 214, 167, 0.08), transparent 60%),
    radial-gradient(700px 500px at 100% 100%, rgba(38, 100, 200, 0.06), transparent 60%),
    linear-gradient(180deg, var(--bg-base) 0%, var(--bg-deep) 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-shell {
  width: min(100%, 540px);
  min-height: 100svh;
  margin: 0 auto;
  padding: 20px;
  display: grid;
  grid-template-rows: auto auto auto auto auto;
  gap: 18px;
}

/* ---------- Brand badge ---------- */

.brand-badge {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 800;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
  line-height: 1;
  flex-shrink: 0;
  box-shadow: 0 8px 24px rgba(61, 214, 167, 0.35);
}

.brand-badge--sm {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  box-shadow: 0 6px 14px rgba(61, 214, 167, 0.25);
}

/* ---------- Topbar ---------- */

.topbar {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.brand-sub {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
}

/* ---------- Icon buttons ---------- */

.icon-button,
.swap-button {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-strong);
  color: var(--text);
  font-size: 1.15rem;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}

.icon-button:hover,
.swap-button:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-strong);
}

.icon-button:active,
.swap-button:active {
  transform: scale(0.96);
}

/* ---------- Language panel ---------- */

.language-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 16px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: end;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

label span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0 36px 0 14px;
  background:
    var(--panel-strong)
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%238aa0bd' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>")
    no-repeat right 14px center;
  color: var(--text);
  font: inherit;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  transition: border-color 0.12s ease, background-color 0.12s ease;
}

select:hover {
  border-color: var(--border-strong);
}

select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* En navegadores Chromium las opciones heredan colores oscuros del control. */
select option {
  background: #0c182b;
  color: var(--text);
}

select option:disabled {
  color: var(--muted-soft);
}

/* ---------- Control panel ---------- */

.control-panel {
  display: grid;
  place-items: center;
  gap: 16px;
  padding: 16px 0 8px;
}

.main-button {
  width: min(62vw, 220px);
  aspect-ratio: 1;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: var(--shadow-button);
  transition: transform 0.12s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.main-button:hover {
  background: #4ce0b3;
}

.main-button:disabled {
  opacity: 0.55;
  cursor: progress;
}

.main-button[data-running="true"] {
  background: var(--danger-deep);
  color: #fff;
  box-shadow: var(--shadow-button-danger);
}

.main-button[data-running="true"]:hover {
  background: #962323;
}

.main-button:active {
  transform: scale(0.97);
}

.status-text {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}

.status-text[data-tone="error"] {
  color: #fca5a5;
}

/* ---------- Captions ---------- */

.captions {
  display: grid;
  gap: 12px;
}

.captions article {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 16px;
  min-height: 96px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.captions h2 {
  margin: 0 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.captions p {
  margin: 0;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--text);
}

/* ---------- Settings sheet ---------- */

.settings-sheet {
  position: fixed;
  inset: 0;
  display: grid;
  align-items: end;
  background: rgba(2, 6, 14, 0.6);
  padding: 16px;
  z-index: 50;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.settings-sheet[hidden] {
  display: none;
}

.sheet-card {
  width: min(100%, 520px);
  margin: 0 auto;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border: 1px solid var(--border-strong);
  border-radius: 24px;
  padding: 18px;
  display: grid;
  gap: 16px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.sheet-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sheet-card header h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---------- Footer ---------- */

.site-footer {
  margin-top: 8px;
  padding: 18px 8px 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--muted-soft);
  font-size: 0.86rem;
  text-align: center;
}

.site-footer__text strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- Diagnostic panel ---------- */

.diag-panel {
  position: fixed;
  right: 12px;
  bottom: 12px;
  width: min(360px, calc(100% - 24px));
  max-height: 70svh;
  overflow: auto;
  z-index: 60;
  background: rgba(10, 20, 36, 0.92);
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  padding: 14px 16px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  color: var(--text);
}

.diag-panel[hidden] {
  display: none;
}

.diag-panel header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 10px;
}

.diag-panel header h3 {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-family: inherit;
  font-weight: 700;
}

.diag-panel header .icon-button {
  min-width: 32px;
  min-height: 32px;
  font-size: 1rem;
}

.diag-panel dl {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 14px;
}

.diag-panel dt {
  color: var(--muted);
  font-weight: 500;
}

.diag-panel dd {
  margin: 0;
  word-break: break-word;
  color: var(--text);
}

.diag-panel dd.warn { color: #fbbf24; }
.diag-panel dd.bad  { color: #fca5a5; }
.diag-panel dd.ok   { color: var(--accent); }

#brandBadge {
  cursor: pointer;
  user-select: none;
}

/* ---------- Hidden audio sink ---------- */

#translatedAudioSink {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

/* ---------- Breakpoint ---------- */

@media (min-width: 720px) {
  .app-shell {
    padding-block: 32px;
  }
}