:root {
  --bg: #f6f3ee;
  --panel: #fffdf9;
  --ink: #1c1916;
  --muted: #6b645c;
  --line: #ddd4c8;
  --accent: #1f5c4a;
  --accent-soft: #e4f0eb;
  --ok: #1f5c4a;
  --bad: #8b1e1e;
  --pending: #8a6a2f;
  --mono: "Cascadia Mono", "Consolas", ui-monospace, monospace;
  --sans: "Segoe UI", "Helvetica Neue", sans-serif;
  --sidebar: 280px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #efe6d8 0%, transparent 60%),
    var(--bg);
  line-height: 1.45;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 88%, #e8e0d4);
  padding: 1rem 0.75rem 1.5rem;
}

.sidebar-head h2 {
  margin: 0;
  font-size: 1rem;
}

.sidebar-sub {
  margin: 0.25rem 0 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.filter-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

#constrFilter {
  width: 100%;
  margin-bottom: 0.75rem;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: 0.9rem var(--sans);
  background: #fff;
}

.constr-nav {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.constr-btn {
  appearance: none;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 8px;
  padding: 0.45rem 0.5rem;
  cursor: pointer;
  font: 0.82rem/1.3 var(--sans);
  color: var(--ink);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 0.55rem;
  align-items: start;
}

.constr-btn:hover {
  background: rgba(255, 255, 255, 0.65);
}

.constr-btn.active {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
}

.constr-btn .num {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 1.6rem;
}

.constr-btn .label {
  grid-column: 2;
}

.constr-btn .badge {
  grid-column: 2;
  font-size: 0.72rem;
  color: var(--pending);
}

.constr-btn.ready .badge {
  color: var(--ok);
}

.constr-btn.hidden-filter {
  display: none;
}

main {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.45rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

header a {
  color: var(--accent);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 1rem;
}

.chip {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.chip strong {
  color: var(--ink);
  font-weight: 600;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1rem 1.15rem;
  box-shadow: 0 1px 0 rgba(28, 25, 22, 0.04);
}

.card h2 {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 0.95rem;
}

.prompt {
  font-size: 1.15rem;
  margin: 0 0 1rem;
}

.prompt q {
  quotes: "«" "»";
}

.vocab-panel {
  margin: 0 0 1rem;
  padding: 0.75rem 0.85rem;
  border-radius: 8px;
  background: #f3eee6;
  border: 1px solid var(--line);
}

.vocab-panel h3 {
  margin: 0 0 0.4rem;
  font-size: 0.9rem;
}

.vocab {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.92rem;
}

.vocab li {
  margin: 0.28rem 0;
}

label[for="answer"] {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

textarea {
  width: 100%;
  min-height: 5.5rem;
  resize: vertical;
  font: 1rem/1.4 var(--sans);
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 45%, white);
  border-color: var(--accent);
}

.mic-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin: 0.55rem 0 0;
}

.mic-status {
  font-size: 0.85rem;
  color: var(--muted);
}

#btnMic.recording {
  background: #8b1e1e;
  border-color: #8b1e1e;
  color: #fff;
}

#btnMic.busy {
  opacity: 0.7;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.85rem;
}

button {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  font: 0.95rem var(--sans);
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button:hover {
  filter: brightness(0.97);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.result {
  margin-top: 1rem;
  padding: 0.85rem 0.95rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  display: none;
}

.result.show {
  display: block;
}

.result.ok {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--ok) 35%, var(--line));
}

.result.bad {
  background: #f8ecec;
  border-color: color-mix(in srgb, var(--bad) 30%, var(--line));
}

.result .label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.result .key {
  font-family: var(--mono);
  font-size: 0.95rem;
}

.panel {
  margin-top: 1rem;
  border-top: 1px dashed var(--line);
  padding-top: 0.9rem;
}

.matrix {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: #f3eee6;
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.hint {
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    max-height: 42vh;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
}