:root {
  --bg: #17161d;
  --surface: #222631;
  --panel: #2f3644;
  --panel-soft: rgba(53, 62, 79, 0.78);
  --text: #f7efe3;
  --muted: #beb8ae;
  --accent: #ff9a3d;
  --accent-soft: #ffe1bc;
  --line: rgba(255, 255, 255, 0.1);
  --display-font: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  --body-font: "Avenir Next", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--body-font);
  background:
    radial-gradient(circle at top left, rgba(255, 154, 61, 0.2), transparent 34%),
    radial-gradient(circle at bottom right, rgba(141, 211, 255, 0.18), transparent 30%),
    linear-gradient(180deg, #1a1b24 0%, #0e1015 100%);
}

.app-shell {
  width: min(1280px, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.intro-panel,
.chat-card,
.result-card {
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: var(--panel-soft);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.2);
}

.intro-panel {
  padding: 1.6rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-soft);
  font-weight: 700;
}

h1,
h2 {
  margin: 0;
  font-family: var(--display-font);
  line-height: 1;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  max-width: 10ch;
}

.lede {
  max-width: 58ch;
  color: var(--muted);
}

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.architecture-grid article {
  padding: 1rem;
  border-radius: 1.1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
}

.architecture-grid p {
  color: var(--muted);
}

.workspace-panel {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 1rem;
  margin-top: 1rem;
}

.chat-card,
.result-card {
  padding: 1.2rem;
}

.chat-head,
.card-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0 0.8rem;
  border-radius: 999px;
  color: #151515;
  background: var(--accent);
  font-weight: 700;
}

.status-pill-muted {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

.prompt-form {
  display: grid;
  gap: 0.8rem;
  margin-top: 1rem;
}

textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem;
  background: rgba(8, 9, 12, 0.35);
  color: var(--text);
  font: inherit;
}

button,
.card-head a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #151515;
  font-weight: 800;
  text-decoration: none;
}

button {
  cursor: pointer;
}

.message-log,
.timeline,
.architecture-readout {
  display: grid;
  gap: 0.8rem;
  margin-top: 1rem;
}

.message {
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
}

.system-message {
  background: rgba(255, 255, 255, 0.03);
}

.user-message {
  background: rgba(255, 154, 61, 0.1);
}

.timeline-item {
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.architecture-readout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.architecture-block {
  padding: 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.architecture-block h3 {
  margin: 0 0 0.7rem;
  font-size: 1rem;
}

.architecture-block ul,
.architecture-block ol {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}

.architecture-block li {
  line-height: 1.4;
}

.timeline-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

.result-column {
  display: grid;
  gap: 1rem;
}

.preview-card iframe {
  width: 100%;
  min-height: 560px;
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: white;
}

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

.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: 980px) {
  .architecture-grid,
  .workspace-panel {
    grid-template-columns: 1fr;
  }

  .architecture-readout {
    grid-template-columns: 1fr;
  }

  .preview-card iframe {
    min-height: 420px;
  }
}