:root {
  --bg: #f4efe6;
  --panel: rgba(255, 251, 245, 0.9);
  --panel-strong: #fffaf3;
  --ink: #1e2430;
  --muted: #667085;
  --line: rgba(30, 36, 48, 0.08);
  --accent: #15616d;
  --accent-2: #ff7d00;
  --danger: #c1121f;
  --shadow: 0 24px 60px rgba(34, 43, 59, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Noto Sans TC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(21, 97, 109, 0.14), transparent 28%),
    radial-gradient(circle at bottom right, rgba(255, 125, 0, 0.16), transparent 24%),
    linear-gradient(135deg, #f8f2e8 0%, #f0ebe3 48%, #e8f1ef 100%);
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero-card,
.chat-card {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-card {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 24px;
  padding: 32px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.lead {
  margin-top: 16px;
  max-width: 44rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.signal-panel {
  display: grid;
  gap: 14px;
  align-content: center;
}

.signal {
  padding: 18px 20px;
  border-radius: 18px;
  font-weight: 700;
  color: white;
}

.normal {
  background: linear-gradient(135deg, #2a9d8f, #15616d);
}

.warning {
  background: linear-gradient(135deg, #ffb703, #ff7d00);
}

.danger {
  background: linear-gradient(135deg, #e5383b, #c1121f);
}

.chat-card {
  margin-top: 24px;
  padding: 24px;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.chat-header p {
  margin-top: 6px;
  color: var(--muted);
}

.badge {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(21, 97, 109, 0.08);
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 700;
}

.chat-log {
  margin-top: 20px;
  min-height: 360px;
  max-height: 56vh;
  overflow: auto;
  padding: 8px 4px 8px 0;
}

.bubble {
  max-width: min(85%, 44rem);
  margin-bottom: 14px;
  padding: 16px 18px;
  border-radius: 20px;
  line-height: 1.6;
}

.bubble-assistant {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-top-left-radius: 6px;
}

.bubble-user {
  margin-left: auto;
  background: var(--accent);
  color: white;
  border-top-right-radius: 6px;
}

.chat-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  margin-top: 18px;
}

.mode-indicator {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.diagnostic-indicator {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.chat-form input,
.chat-form button {
  border: 0;
  border-radius: 16px;
  font-size: 1rem;
}

.chat-form input {
  padding: 16px 18px;
  background: white;
  box-shadow: inset 0 0 0 1px rgba(30, 36, 48, 0.08);
}

.chat-form button {
  padding: 16px 22px;
  background: linear-gradient(135deg, #15616d, #1d7f8c);
  color: white;
  font-weight: 700;
  cursor: pointer;
}

@media (max-width: 820px) {
  .app-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 20px;
  }

  .hero-card {
    grid-template-columns: 1fr;
    padding: 24px;
  }

  .chat-header,
  .chat-form {
    grid-template-columns: 1fr;
    display: grid;
  }

  .badge {
    width: fit-content;
  }

  .chat-log {
    min-height: 300px;
  }
}