:root {
  color-scheme: light dark;
  --bg: #f6f7f4;
  --panel: #ffffff;
  --panel-soft: #eef3ee;
  --text: #17201d;
  --muted: #66716c;
  --border: #d7ddd7;
  --accent: #1c7c64;
  --accent-strong: #0f5f4d;
  --warning: #8a5a00;
  --danger: #a83232;
  --gold: #ba7b16;
  --shadow: 0 12px 36px rgba(24, 34, 30, 0.08);
  --radius: 8px;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111614;
    --panel: #1a211e;
    --panel-soft: #202a26;
    --text: #eef5ef;
    --muted: #a9b4ad;
    --border: #34413b;
    --accent: #53c6a4;
    --accent-strong: #70dab7;
    --warning: #e3b04b;
    --danger: #f07d7d;
    --gold: #e0a73f;
    --shadow: none;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input,
textarea {
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

button {
  min-height: 44px;
  padding: 0 14px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  background: var(--panel);
  color: var(--text);
}

textarea {
  resize: vertical;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 4px;
  font-size: 24px;
}

h2 {
  margin-bottom: 18px;
  font-size: 17px;
}

h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

fieldset {
  min-width: 0;
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}

legend,
.field > span,
.topbar label span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  padding: 10px clamp(16px, 4vw, 32px);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(12px);
}

.topbar strong {
  display: block;
  font-size: 17px;
}

.topbar #chatMeta {
  display: block;
  max-width: 58vw;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: end;
  gap: 10px;
}

.topbar-actions select {
  min-width: 132px;
}

.warning {
  padding: 10px 18px;
  border-bottom: 1px solid color-mix(in srgb, var(--warning) 45%, var(--border));
  background: color-mix(in srgb, var(--warning) 14%, var(--panel));
  color: var(--warning);
  font-weight: 700;
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 12px clamp(16px, 4vw, 32px) 0;
}

.tabs button {
  min-height: 40px;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
}

.tabs button.active {
  border-color: var(--border);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
}

.app-shell {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 22px clamp(16px, 4vw, 32px) 34px;
}

.view[hidden] {
  display: none;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading p,
.muted {
  color: var(--muted);
}

.heading-actions,
.two-column,
.composer-row {
  display: flex;
  gap: 10px;
}

.setup-grid,
.history-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
}

.panel,
.coach-card,
.phrase-item,
.history-item,
.history-detail {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel {
  padding: 18px;
}

.segmented,
.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.segmented label,
.difficulty-grid label,
.toggle-line {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.segmented input,
.difficulty-grid input,
.toggle-line input {
  width: auto;
  min-height: auto;
}

.field {
  display: block;
  margin-bottom: 16px;
}

.security-note {
  margin-bottom: 16px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 13px;
}

.two-column > .field {
  flex: 1 1 0;
}

.primary-action {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
}

.primary-action:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.icon-button {
  width: 44px;
  padding: 0;
}

.chat-view {
  min-height: calc(100vh - 150px);
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: calc(100vh - 260px);
  min-height: 360px;
  overflow-y: auto;
  padding: 4px 4px 130px;
  scroll-behavior: smooth;
}

.message-row {
  display: grid;
  gap: 8px;
  max-width: min(760px, 94%);
}

.message-row.user {
  align-self: end;
}

.message-row.assistant {
  align-self: start;
}

.bubble {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}

.message-row.user .bubble {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: color-mix(in srgb, var(--accent) 11%, var(--panel));
}

.bubble-body {
  white-space: pre-wrap;
}

.thinking {
  color: var(--muted);
}

.coach-card {
  padding: 12px;
  background: color-mix(in srgb, var(--panel-soft) 72%, var(--panel));
}

.coach-card summary {
  cursor: pointer;
  font-weight: 800;
}

.dimension-list,
.fix-list {
  display: grid;
  gap: 8px;
  margin: 10px 0;
  padding: 0;
  list-style: none;
}

.dimension-list li,
.fix-list li,
.better-version {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}

.dimension-list li {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) 44px;
  gap: 8px;
  align-items: start;
}

.dimension-list li p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
}

.score {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 28px;
  border-radius: 999px;
  color: #fff;
}

.score.low {
  background: var(--danger);
}

.score.mid {
  background: var(--gold);
}

.score.high {
  background: var(--accent);
}

.fix-list span,
.better-version span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.fix-list p,
.better-version p {
  margin: 6px 0;
}

.better-version {
  display: grid;
  gap: 8px;
}

.better-version button {
  justify-self: start;
}

.inline-error {
  padding: 12px;
  border: 1px solid color-mix(in srgb, var(--danger) 50%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--danger) 10%, var(--panel));
  color: var(--danger);
}

.composer {
  position: sticky;
  bottom: 0;
  z-index: 8;
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.voice-status,
.interim {
  min-height: 20px;
  color: var(--muted);
  font-size: 13px;
}

.mic-button {
  width: 50px;
  padding: 0;
}

.mic-button.is-recording {
  border-color: var(--danger);
  color: var(--danger);
}

.composer textarea {
  min-height: 50px;
  resize: none;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
  margin-bottom: 16px;
}

.inline-form .field {
  margin-bottom: 0;
}

.list {
  display: grid;
  gap: 10px;
}

.phrase-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 260px) auto;
  gap: 10px;
  align-items: center;
  padding: 14px;
}

.phrase-item p {
  margin-bottom: 4px;
}

.item-meta {
  color: var(--muted);
  font-size: 13px;
}

.history-grid {
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
}

.history-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  padding: 8px;
}

.history-item.selected {
  border-color: var(--accent);
}

.history-item button:first-child {
  display: grid;
  justify-items: start;
  height: auto;
  min-height: 54px;
  text-align: left;
}

.history-item span {
  color: var(--muted);
  font-size: 13px;
}

.history-detail {
  min-height: 360px;
  padding: 18px;
}

.history-turn {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.empty-state {
  padding: 28px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  text-align: center;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 20;
  max-width: min(360px, calc(100vw - 36px));
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--text);
  color: var(--bg);
  box-shadow: var(--shadow);
}

@media (max-width: 780px) {
  body {
    padding-bottom: 72px;
  }

  .topbar {
    align-items: start;
  }

  .topbar-actions {
    align-items: center;
  }

  .topbar label span {
    display: none;
  }

  .tabs {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 15;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    padding: 8px max(8px, env(safe-area-inset-left)) calc(8px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--border);
    background: var(--panel);
  }

  .tabs button {
    min-width: 0;
    padding: 0 4px;
    font-size: 12px;
  }

  .app-shell {
    padding: 18px 12px 18px;
  }

  .section-heading,
  .topbar,
  .heading-actions,
  .two-column,
  .composer-row {
    align-items: stretch;
    flex-direction: column;
  }

  .setup-grid,
  .history-grid,
  .inline-form,
  .phrase-item {
    grid-template-columns: 1fr;
  }

  .segmented,
  .difficulty-grid {
    grid-template-columns: 1fr;
  }

  .messages {
    height: calc(100vh - 290px);
    min-height: 300px;
    padding-bottom: 170px;
  }

  .message-row {
    max-width: 100%;
  }

  .composer {
    border-right: 0;
    border-left: 0;
    border-radius: 0;
    margin-right: -12px;
    margin-left: -12px;
  }

  .mic-button,
  .icon-button {
    width: 100%;
  }
}