:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --ink: #14213d;
  --muted: #4f5d75;
  --ok: #157f3b;
  --error: #b42318;
  --line: #d7e0ea;
  --accent: #0f6d9f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top right, #d8ecff 0, transparent 45%), var(--bg);
}

.app-shell {
  width: min(920px, 100% - 2rem);
  margin: 2rem auto 3rem;
  display: grid;
  gap: 1rem;
}

.hero {
  background: linear-gradient(130deg, #0f6d9f 0%, #2a9d8f 100%);
  color: #fff;
  border-radius: 18px;
  padding: 1.5rem;
}

.hero h1 {
  margin: 0.25rem 0 0.75rem;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
}

.hero p {
  margin: 0;
  max-width: 70ch;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.9;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
}

.card h2 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.stack {
  display: grid;
  gap: 0.7rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.95rem;
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
  background: #fff;
}

button {
  border: none;
  border-radius: 10px;
  padding: 0.65rem 0.85rem;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

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

.split {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: 1fr 1fr;
}

.import-box {
  margin-top: 0.8rem;
}

.status {
  margin: 0.8rem 0 0;
  color: var(--muted);
}

.status[data-tone="ok"] {
  color: var(--ok);
}

.status[data-tone="error"] {
  color: var(--error);
}

.output {
  margin-top: 0.8rem;
  background: #0b132b;
  color: #e8f0ff;
  padding: 0.8rem;
  border-radius: 10px;
  overflow: auto;
  font-size: 0.85rem;
}

.hidden {
  display: none;
}

@media (max-width: 720px) {
  .split {
    grid-template-columns: 1fr;
  }

  .app-shell {
    width: min(920px, 100% - 1rem);
    margin-top: 1rem;
  }
}