:root {
  color-scheme: light;
  --bg: #eef2f7;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #d7dde8;
  --primary: #1769aa;
  --primary-dark: #105184;
  --accent: #c4512f;
  --soft: #f5f8fc;
  --assistant: #f4f7fb;
  --user: #e7f1fb;
  --shadow: 0 20px 60px rgba(31, 41, 55, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 24px;
  background:
    linear-gradient(135deg, rgba(23, 105, 170, 0.14), transparent 34rem),
    linear-gradient(180deg, #fbfcfe 0%, var(--bg) 100%);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

button {
  min-height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  background: var(--primary-dark);
}

button:disabled {
  cursor: default;
  opacity: 0.72;
}

.ghost {
  background: #e9eef5;
  color: var(--text);
}

.ghost:hover {
  background: #dde5ef;
}

.app {
  width: min(100%, 980px);
  min-height: calc(100vh - 48px);
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto auto auto minmax(320px, 1fr) auto;
  gap: 16px;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.topbar {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 900;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.1rem);
  letter-spacing: 0;
}

.settings {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(160px, 220px) auto;
  gap: 12px;
  align-items: end;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  -webkit-text-fill-color: var(--text);
  caret-color: var(--primary);
  background: #fff;
  outline: none;
}

input::placeholder,
textarea::placeholder {
  color: #8a94a6;
  opacity: 1;
  -webkit-text-fill-color: #8a94a6;
}

input::selection,
textarea::selection {
  background: rgba(23, 105, 170, 0.22);
  color: var(--text);
  -webkit-text-fill-color: var(--text);
}

input,
select {
  min-height: 44px;
  padding: 10px 12px;
  font-weight: 650;
}

textarea {
  min-height: 74px;
  resize: vertical;
  padding: 13px 14px;
  line-height: 1.5;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(23, 105, 170, 0.16);
}

input:-webkit-autofill,
input:-webkit-autofill:focus,
textarea:-webkit-autofill,
textarea:-webkit-autofill:focus {
  box-shadow: 0 0 0 1000px #fff inset, 0 0 0 3px rgba(23, 105, 170, 0.16);
  -webkit-text-fill-color: var(--text);
  caret-color: var(--primary);
}

.security-note {
  margin: 0;
  padding: 11px 13px;
  border: 1px solid #ead3c9;
  border-radius: 6px;
  background: #fff8f4;
  color: #75412d;
  line-height: 1.5;
  font-size: 0.93rem;
  font-weight: 650;
}

.chat-log {
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.message {
  width: min(78%, 700px);
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  line-height: 1.58;
  white-space: pre-wrap;
}

.message.assistant {
  align-self: flex-start;
  background: var(--assistant);
}

.message.user {
  align-self: flex-end;
  background: var(--user);
  border-color: #c5dbef;
}

.message-meta {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 900;
}

.message p,
.status-message {
  margin: 0;
}

.status-message {
  align-self: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: #e8f2ea;
  color: #28613a;
  font-size: 0.88rem;
  font-weight: 800;
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 720px) {
  body {
    padding: 14px;
  }

  .app {
    min-height: calc(100vh - 28px);
    padding: 18px;
  }

  .topbar,
  .composer {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: grid;
  }

  .settings {
    grid-template-columns: 1fr;
  }

  .message {
    width: 100%;
  }
}