:root {
  --bg: #f7f8fa;
  --panel: #fff;
  --line: #dfe3e8;
  --ink: #1c2430;
  --muted: #6b7683;
  --accent: #1a5f9e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  padding: 16px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

h1 { margin: 0; font-size: 18px; }

.sub { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.sub a { color: var(--accent); }

#transcript {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.turn { max-width: 900px; }

.turn.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  border-radius: 12px 12px 2px 12px;
}

.turn.bot {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 12px 16px;
  border-radius: 12px 12px 12px 2px;
}

.turn.bot.miss  { border-color: #e0b400; background: #fffbeb; }
.turn.bot.error { border-color: #d14;    background: #fff5f5; }

.options { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

.options button {
  border: 1px solid var(--accent);
  background: #fff;
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 14px;
}

.options button:hover { background: var(--accent); color: #fff; }

table {
  border-collapse: collapse;
  margin-top: 10px;
  width: 100%;
  font-size: 14px;
  display: block;
  overflow-x: auto;
  max-height: 60vh;
}

th, td {
  border: 1px solid var(--line);
  padding: 6px 10px;
  text-align: left;
  white-space: nowrap;
}

th { background: #eef1f5; position: sticky; top: 0; }

#composer {
  display: flex;
  gap: 8px;
  padding: 16px 24px;
  background: var(--panel);
  border-top: 1px solid var(--line);
}

#question {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
}

#composer button {
  padding: 10px 20px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.secondary-button {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
}

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

.login-page {
  min-height: 100vh;
  height: auto;
  background: #edf1f4;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(100%, 400px);
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 16px 42px rgba(28, 36, 48, 0.1);
}

.product-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
}

.product-name {
  margin: 0 0 28px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 650;
}

.login-panel h1 { font-size: 24px; }
.login-note { margin: 6px 0 24px; color: var(--muted); font-size: 14px; }

.login-form { display: grid; gap: 8px; }
.login-form label { margin-top: 8px; font-size: 14px; font-weight: 600; }

.login-form input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font: inherit;
}

.login-form input:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(26, 95, 158, 0.14);
}

.login-form button {
  min-height: 44px;
  margin-top: 12px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 650;
}

.login-form button:disabled { cursor: wait; opacity: 0.65; }
.form-error { min-height: 21px; margin: 4px 0 0; color: #b42318; font-size: 14px; }

@media (max-width: 600px) {
  header { padding: 14px 16px; }
  .app-header { align-items: flex-start; }
  .app-header .sub { max-width: 34ch; }
  #transcript { padding: 16px; }
  #composer { padding: 12px 16px; }
  .login-panel { padding: 24px; }
}