:root {
  --bg: #f4f7f2;
  --card: #ffffff;
  --text: #1d2a1f;
  --muted: #5f6f62;
  --line: #dde5da;
  --accent: #2f9e57;
  --accent-soft: #e3f4e8;
  --me: #fff3c4;
  --hint: #fff7e0;
  --sent: #e8f0ff;
  --danger: #c0392b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121714;
    --card: #1b221d;
    --text: #e6eee7;
    --muted: #9aab9d;
    --line: #2c3830;
    --accent: #4cc27a;
    --accent-soft: #1f3327;
    --me: #3a3420;
    --hint: #352f1d;
    --sent: #1e2a40;
    --danger: #ff7a6b;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  line-height: 1.5;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.topbar h1 {
  margin: 0;
  font-size: 1.2rem;
}
.topbar p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.logo {
  font-size: 2rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  grid-template-areas:
    "settings side"
    "chat side";
  gap: 16px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}
.settings {
  grid-area: settings;
}
.chat {
  grid-area: chat;
}
.side {
  grid-area: side;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
@media (max-width: 800px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "settings" "chat" "side";
  }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
}
.card h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.settings {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}
.settings label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--muted);
}
.settings .wide {
  grid-column: 1 / -1;
}
.settings .check {
  flex-direction: row;
  align-items: center;
  grid-column: 1 / -1;
}

input,
select,
button {
  font: inherit;
  color: var(--text);
}
input,
select {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  min-width: 0;
}
button {
  border: 0;
  border-radius: 8px;
  padding: 8px 14px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
button.icon {
  background: var(--accent-soft);
  color: var(--text);
  padding: 8px 10px;
}
button.icon.listening {
  background: var(--danger);
}
button.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  margin-top: 8px;
}

.chat {
  display: flex;
  flex-direction: column;
  min-height: 480px;
}
.log {
  flex: 1;
  overflow-y: auto;
  max-height: 60vh;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 8px;
}
.composer {
  display: flex;
  gap: 6px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}
.composer input {
  flex: 1;
}
.composer select {
  width: 100px;
}
@media (max-width: 500px) {
  .composer {
    flex-wrap: wrap;
  }
  .composer input {
    flex-basis: 100%;
    order: -1;
  }
}
.status {
  margin: 6px 0 0;
  min-height: 1.2em;
  color: var(--muted);
  font-size: 0.85rem;
}

.msg {
  max-width: 85%;
  padding: 10px 12px;
  border-radius: 12px;
  word-break: break-word;
}
.msg.me {
  align-self: flex-end;
  background: var(--me);
}
.msg.bot {
  align-self: flex-start;
  background: var(--accent-soft);
}
.msg.bot.hint {
  background: var(--hint);
}
.msg.sent {
  align-self: center;
  background: var(--sent);
  font-size: 0.9rem;
  max-width: 95%;
}
.msg.error {
  align-self: center;
  color: var(--danger);
  font-size: 0.9rem;
}
.msg .say {
  font-size: 1.1rem;
  font-weight: 600;
}
.msg .reading {
  color: var(--muted);
  font-size: 0.9rem;
}
.msg .ko {
  color: var(--muted);
  font-size: 0.9rem;
}
.msg .explain {
  margin-top: 6px;
  font-size: 0.9rem;
}
.msg .meta {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.75rem;
}
.msg .speak {
  background: transparent;
  color: var(--text);
  padding: 0 4px;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}
.tag {
  font-size: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 8px;
  background: var(--card);
}

.stats {
  display: grid;
  grid-template-columns: auto auto;
  gap: 4px 12px;
  margin: 0;
  font-size: 0.9rem;
}
.stats dt {
  color: var(--muted);
}
.stats dd {
  margin: 0;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.note {
  color: var(--muted);
  font-size: 0.8rem;
  margin: 8px 0 0;
}
.notebook {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  max-height: 300px;
  overflow-y: auto;
  font-size: 0.85rem;
}
.notebook li {
  border-top: 1px solid var(--line);
  padding: 6px 0;
}
.notebook .from {
  color: var(--muted);
  text-decoration: line-through;
}

.mode-switch {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 10px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  touch-action: pan-y;
  user-select: none;
}
.mode-switch .thumb {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc(50% - 4px);
  border-radius: 999px;
  background: var(--accent);
  transition: transform 0.2s ease;
}
.mode-switch.handsfree .thumb {
  transform: translateX(100%);
}
.mode-switch button {
  position: relative;
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  min-height: 40px;
}
.mode-switch button[aria-checked="true"] {
  color: #fff;
  font-weight: 600;
}

button.mic {
  --level: 0;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  transition: box-shadow 0.08s linear;
}
button.mic.listening {
  box-shadow: 0 0 0 calc(4px + var(--level) * 12px) rgba(192, 57, 43, 0.35);
}
button.mic.handsfree {
  background: var(--accent);
  box-shadow: 0 0 0 calc(var(--level) * 12px) rgba(47, 158, 87, 0.35);
}
button.mic.handsfree.listening {
  background: var(--danger);
}
button.mic.handsfree.paused {
  background: var(--line);
  box-shadow: none;
}