:root {
  color-scheme: light;
  --bg: #f5f1e8;
  --panel: rgba(255, 252, 246, 0.88);
  --ink: #1d1a16;
  --muted: #6d665c;
  --line: rgba(29, 26, 22, 0.12);
  --accent: #0d6e5f;
  --accent-strong: #084e43;
  --secondary: #d8cfbf;
  --shadow: 0 24px 60px rgba(27, 20, 9, 0.12);
  --radius: 24px;
}

* {
  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(13, 110, 95, 0.18), transparent 28%),
    radial-gradient(circle at bottom right, rgba(196, 142, 78, 0.16), transparent 22%),
    linear-gradient(180deg, #fbf8f1 0%, var(--bg) 100%);
}

code,
pre,
input {
  font-family: "Consolas", "SFMono-Regular", monospace;
}

.app {
  width: min(1080px, calc(100% - 32px));
  margin: 32px auto 48px;
  display: grid;
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  padding: 24px;
}

.hero h1,
.preview-card h2,
.log-panel h2 {
  margin: 0 0 12px;
}

.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
}

.lead {
  margin: 0;
  max-width: 760px;
  line-height: 1.7;
  color: var(--muted);
}

.settings,
.composer {
  display: grid;
  gap: 20px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 14px;
  font-weight: 700;
}

.field input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.72);
}

.readonly-value {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  word-break: break-all;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  transition:
    transform 160ms ease,
    opacity 160ms ease,
    background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--accent-strong);
}

.button.secondary {
  color: var(--ink);
  background: var(--secondary);
}

.button.accent {
  background: linear-gradient(135deg, #0d6e5f 0%, #c77738 100%);
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.meta div {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.54);
}

.meta dt {
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--muted);
}

.meta dd {
  margin: 0;
  font-weight: 700;
}

.segment {
  display: inline-flex;
  padding: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  gap: 6px;
}

.segment-item {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
  cursor: pointer;
  color: var(--muted);
}

.segment-item.active {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 6px 18px rgba(29, 26, 22, 0.08);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.preview-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.58);
}

#messagePreview {
  margin: 0;
  max-height: 420px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
  font-size: 13px;
}

.notes {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
}

.log-output {
  min-height: 80px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #171411;
  color: #efe7db;
  padding: 16px;
  font-family: "Consolas", "SFMono-Regular", monospace;
  white-space: pre-wrap;
  line-height: 1.6;
}

@media (max-width: 760px) {
  .app {
    width: min(100% - 20px, 1080px);
    margin-top: 20px;
  }

  .meta,
  .preview-grid {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 18px;
    border-radius: 20px;
  }

  .actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }
}