:root {
  --bg: #000000;
  --bg-soft: #0a1520;
  --navy: #1a3a52;
  --ink: #e8eef3;
  --muted: #8a9bab;
  --accent: #00a896;
  --accent-ink: #001510;
  --line: rgba(26, 58, 82, 0.55);
  --focus: rgba(0, 168, 150, 0.45);
  --font: 'Source Sans 3', 'Segoe UI', sans-serif;
  --display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --radius: 0.3rem;
  --tap: 2.75rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  background:
    radial-gradient(900px 420px at 90% -5%, rgba(0, 168, 150, 0.12), transparent 55%),
    radial-gradient(640px 360px at -5% 40%, rgba(26, 58, 82, 0.45), transparent 50%),
    linear-gradient(180deg, #05090d 0%, var(--bg) 45%, #000000 100%);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.55;
}

a {
  color: var(--accent);
}

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

.app-home main {
  max-width: 520px;
  margin: 0 auto;
  padding: 3rem 1.25rem;
  text-align: center;
  display: grid;
  gap: 0.85rem;
}

.app-home h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand-logo {
  display: flex;
  justify-content: center;
  margin: 0 0 0.5rem;
}

.brand-logo img {
  display: block;
  width: min(18rem, 82vw);
  height: auto;
  margin-inline: auto;
  background: transparent;
  padding: 0;
}

.brand {
  font-family: var(--display);
  font-weight: 500;
  font-size: 2.1rem;
  letter-spacing: -0.02em;
  margin: 0;
}

.links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.links a {
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  color: var(--ink);
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.demo,
.admin {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  display: grid;
  gap: 1rem;
}

.page-brand {
  display: grid;
  gap: 0.45rem;
  justify-items: start;
}

.page-brand img {
  display: block;
  width: min(11rem, 55vw);
  height: auto;
}

.chat-log {
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 0.15rem);
  min-height: 320px;
  padding: 1rem;
  display: grid;
  gap: 0.5rem;
  align-content: start;
  background: rgba(26, 58, 82, 0.18);
}

.msg {
  max-width: 85%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
}

.msg.user {
  justify-self: end;
  background: rgba(0, 168, 150, 0.22);
}

.msg.bot {
  justify-self: start;
  background: rgba(233, 236, 233, 0.06);
}

.msg-bot-wrap {
  justify-self: start;
  display: grid;
  gap: 0.45rem;
  max-width: 95%;
}

.opt-box {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.opt-btn {
  background: rgba(233, 236, 233, 0.05);
  color: var(--ink);
  border: 1px solid var(--line);
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
}

.opt-btn:hover {
  border-color: var(--accent);
}

.opt-row {
  width: 100%;
  display: grid;
  gap: 0.15rem;
}

.opt-row span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 400;
}

.row {
  display: flex;
  gap: 0.5rem;
}

input,
textarea,
button,
select {
  font: inherit;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(233, 236, 233, 0.04);
  color: var(--ink);
  padding: 0.75rem 0.9rem;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--focus);
  outline-offset: 1px;
  border-color: var(--accent);
}

button {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  font-weight: 600;
  cursor: pointer;
  min-height: 2.5rem;
}

button:hover {
  filter: brightness(1.05);
}

.row input {
  flex: 1;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.35rem;
  text-align: left;
}

.pin-box {
  max-width: 320px;
  display: grid;
  gap: 0.75rem;
}

.error {
  color: #ff8f7a;
}

code {
  color: var(--ink);
  font-size: 0.9em;
}