:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-soft: #f0f3f5;
  --text: #172027;
  --muted: #66737d;
  --line: #dce3e7;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --accent-soft: #dff5f1;
  --danger: #b42318;
  --warning: #8a4b0f;
  --shadow: 0 8px 30px rgba(23, 32, 39, 0.06);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-block-size: 100dvh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

button, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.55; }
button:focus-visible, a:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid #12a594;
  outline-offset: 3px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem 1.25rem 1.25rem;
  background: #102d2b;
  color: #fff;
}

h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(1.35rem, 1rem + 2vw, 1.8rem); line-height: 1.2; }
h2 { font-size: 1.08rem; }
h3 { font-size: 1rem; }
.eyebrow { color: #8ed8ce; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; margin-block-end: 0.35rem; }
.subtitle { color: #bed4d1; font-size: 0.86rem; margin-block-start: 0.3rem; }
.app-badge { border: 1px solid #49736e; border-radius: 999px; padding: 0.3rem 0.65rem; color: #d8eeeb; font-size: 0.75rem; white-space: nowrap; }

.container {
  inline-size: min(100%, 860px);
  margin-inline: auto;
  padding: 1rem 1rem 6rem;
  container-type: inline-size;
}

.message {
  padding: 0.85rem 1rem;
  border-radius: 12px;
  margin-block-end: 1rem;
  background: #fff4e5;
  color: #71410c;
  border: 1px solid #f0d39f;
}
.message.success { background: var(--accent-soft); color: var(--accent-dark); border-color: #a9ded4; }

.status-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.15rem 1.2rem;
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
  margin-block-end: 1rem;
}
.section-label { color: var(--muted); font-size: 0.78rem; margin-block-end: 0.3rem; }
.mode-value { display: flex; align-items: center; gap: 0.55rem; font-size: 1.05rem; font-weight: 700; }
.status-dot { inline-size: 0.7rem; block-size: 0.7rem; border-radius: 50%; background: #16a34a; flex: 0 0 auto; }
.status-dot.off { background: #d97706; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.15rem;
  margin-block-end: 1rem;
  box-shadow: var(--shadow);
}
.panel h2 { margin-block-end: 0.9rem; }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-block-end: 0.8rem; }
.section-heading h2 { margin: 0; }
.counter { display: inline-grid; place-items: center; min-inline-size: 2rem; block-size: 2rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent-dark); font-weight: 700; }
.test-state { color: var(--muted); font-size: 0.85rem; }

.button-grid, .report-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}
.action-button {
  min-block-size: 74px;
  padding: 0.85rem;
  text-align: start;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
  color: var(--text);
  transition: background 150ms ease, border-color 150ms ease;
}
.action-button:hover { background: #e5f3f0; border-color: #8cc9bf; }
.action-button.warning { background: #fff7ed; color: var(--warning); }
.button-kicker { display: block; color: var(--muted); font-size: 0.75rem; margin-block-end: 0.25rem; }
.action-button strong { font-size: 0.92rem; }

.icon-button, .text-button {
  min-block-size: 48px;
  border: 0;
  background: transparent;
  color: var(--accent);
  font-weight: 700;
  padding: 0.5rem;
}
.icon-button { border: 1px solid var(--line); border-radius: 10px; }
.text-button:hover { text-decoration: underline; }

.report-card { background: var(--surface-soft); border-radius: 12px; padding: 0.9rem; }
.report-heading { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; margin: 0.75rem 0 0; }
.metrics div { min-inline-size: 0; }
.metrics dt { color: var(--muted); font-size: 0.72rem; }
.metrics dd { margin: 0.2rem 0 0; font-size: 1.25rem; font-weight: 750; }

.field { margin-block-end: 1rem; }
.field label { display: block; font-weight: 650; margin-block-end: 0.4rem; }
.optional { color: var(--muted); font-weight: 400; font-size: 0.82rem; }
.hint { display: block; color: var(--muted); font-size: 0.78rem; margin-block-start: 0.35rem; }
textarea {
  display: block;
  inline-size: 100%;
  min-block-size: 48px;
  resize: vertical;
  border: 1px solid #929fa7;
  border-radius: 10px;
  padding: 0.75rem;
  background: #fff;
  color: var(--text);
  font-size: max(1rem, 1em);
  line-height: 1.45;
}
textarea:user-invalid { border-color: var(--danger); background: #fff5f4; }
.form-status { color: var(--accent-dark); font-size: 0.86rem; margin-block-start: 0.65rem; }
.form-status.error { color: var(--danger); }

.primary-button, .secondary-button {
  min-block-size: 48px;
  border-radius: 10px;
  padding: 0.7rem 1rem;
  font-weight: 700;
  border: 1px solid transparent;
}
.primary-button { background: var(--accent); color: #fff; }
.primary-button:hover { background: var(--accent-dark); }
.secondary-button { background: var(--surface); color: var(--accent); border-color: #9bc8c0; }
.secondary-button:hover { background: var(--accent-soft); }
.test-actions { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-block-end: 1rem; }

.corrections-list { display: grid; gap: 0.75rem; }
.correction-item { border: 1px solid var(--line); border-radius: 12px; padding: 0.85rem; background: var(--surface-soft); }
.correction-item h3 { font-size: 0.85rem; margin-block-end: 0.45rem; color: var(--accent-dark); }
.correction-item p { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 0.88rem; }
.correction-item .wrong { color: #854b47; margin-block-end: 0.55rem; }
.correction-item time { display: block; color: var(--muted); font-size: 0.72rem; margin-block-start: 0.55rem; }
.empty-state { color: var(--muted); padding: 0.75rem 0; }

.chat { display: grid; gap: 0.6rem; margin-block-end: 1rem; }
.chat:empty { display: none; }
.chat-message { max-inline-size: 88%; padding: 0.7rem 0.85rem; border-radius: 12px; white-space: pre-wrap; overflow-wrap: anywhere; }
.chat-message.user { justify-self: end; background: var(--accent); color: #fff; border-end-end-radius: 4px; }
.chat-message.bot { justify-self: start; background: var(--surface-soft); border: 1px solid var(--line); border-end-start-radius: 4px; }
.chat-message small { display: block; font-weight: 700; margin-block-end: 0.25rem; opacity: 0.8; }

.help-panel { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 1rem 1.15rem; }
.help-panel summary { min-block-size: 48px; font-weight: 700; cursor: pointer; }
.commands-list { margin: 0.5rem 0 0; padding-inline-start: 1.25rem; }
.commands-list li { margin-block: 0.4rem; }
.commands-list code { color: var(--accent-dark); font-weight: 700; }

.bottom-nav {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: rgba(255, 255, 255, 0.97);
  border-top: 1px solid var(--line);
  padding: 0.35rem 0.5rem calc(0.35rem + env(safe-area-inset-bottom));
  box-shadow: 0 -5px 20px rgba(23, 32, 39, 0.06);
}
.bottom-nav a {
  display: grid;
  place-items: center;
  min-block-size: 48px;
  color: var(--accent-dark);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 650;
}

@container (max-width: 560px) {
  .button-grid, .report-grid { grid-template-columns: 1fr; }
  .status-card { align-items: flex-start; flex-direction: column; }
  .chat-message { max-inline-size: 95%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}