:root {
  --bg: #f4f4f2;
  --fg: #1a1a1a;
  --muted: #5c5c5c;
  --border: #cfcfc9;
  --accent: #1f4e3d;
  --accent-hover: #163b2e;
  --error: #8b1e1e;
  --card: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.45;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  font-weight: 650;
}

.sub {
  margin: 0 0 1.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

form {
  display: grid;
  gap: 1.1rem;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.req {
  color: var(--error);
}

.opt {
  font-weight: 400;
  color: var(--muted);
}

input[type="file"],
textarea {
  font: inherit;
  font-weight: 400;
  width: 100%;
  border: 1px solid var(--border);
  padding: 0.55rem 0.65rem;
  background: #fafaf8;
}

textarea {
  resize: vertical;
  min-height: 5rem;
}

button {
  justify-self: start;
  font: inherit;
  font-weight: 600;
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 1.25rem;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.status {
  margin-top: 1rem;
  color: var(--muted);
}

.error {
  margin-top: 1rem;
  color: var(--error);
  white-space: pre-wrap;
}

.result {
  margin-top: 1.75rem;
}

.result h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.result img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  background: #ddd;
}

.result a {
  display: inline-block;
  margin-top: 0.75rem;
  color: var(--accent);
  font-weight: 600;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  margin-top: 0.75rem;
}

.actions a {
  margin-top: 0;
}

button.secondary {
  background: #1877f2;
}

button.secondary:hover:not(:disabled) {
  background: #0f5fc7;
}

a.fb-view {
  display: inline-block;
  font-weight: 700;
  color: #1877f2;
  text-decoration: underline;
}

.fb-caption {
  display: grid;
  gap: 0.4rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.copy-block {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.copy-block h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.copy-block .hint {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 400;
}

.copy-block textarea {
  font: inherit;
  font-weight: 400;
  width: 100%;
  border: 1px solid var(--border);
  padding: 0.55rem 0.65rem;
  background: #fafaf8;
  resize: vertical;
}

.prompt-used {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.prompt-used pre {
  white-space: pre-wrap;
  background: #fafaf8;
  border: 1px solid var(--border);
  padding: 0.75rem;
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--fg);
}