:root {
  --bg: #f7f8f2;
  --panel: #fffef7;
  --ink: #1f2a24;
  --muted: #6a776f;
  --line: #ccd4c9;
  --accent: #146356;
  --accent-strong: #0f4b41;
  --glow-a: #8ccfb8;
  --glow-b: #f0d98a;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 5%, color-mix(in srgb, var(--glow-a) 60%, transparent), transparent 38%),
    radial-gradient(circle at 85% 20%, color-mix(in srgb, var(--glow-b) 60%, transparent), transparent 42%),
    linear-gradient(165deg, #eef1e8 0%, var(--bg) 55%, #f4f4ec 100%);
  color: var(--ink);
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  line-height: 1.45;
}

.background-glow {
  position: fixed;
  inset: -30vh -20vw auto -20vw;
  height: 45vh;
  background: linear-gradient(90deg, color-mix(in srgb, var(--glow-a) 55%, transparent), color-mix(in srgb, var(--glow-b) 55%, transparent));
  filter: blur(55px);
  z-index: -1;
  opacity: 0.35;
}

.app {
  width: min(1040px, 94vw);
  margin: 3rem auto;
  display: grid;
  gap: 1.15rem;
  animation: slide-in 460ms ease both;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4.6vw, 2.8rem);
  letter-spacing: -0.02em;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.subtitle {
  margin: 0.55rem 0 0;
  color: var(--muted);
  max-width: 70ch;
}

.panel {
  background: color-mix(in srgb, var(--panel) 95%, white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--accent) 8%, transparent);
  padding: 1rem;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.panel-head > div {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.panel-head h2 {
  margin: 0;
  font-size: 1rem;
}

textarea,
.output {
  margin-top: 0.75rem;
  width: 100%;
  min-height: 15rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem;
  background: #fbfcf8;
  color: #1a211d;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

textarea:focus,
button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 70%, white);
  outline-offset: 2px;
}

.output {
  margin-bottom: 0;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.controls {
  margin-top: 0.7rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.primary,
.ghost {
  border-radius: 9px;
  border: 1px solid transparent;
  padding: 0.45rem 0.8rem;
  font: inherit;
  cursor: pointer;
  transition: transform 120ms ease, background 160ms ease;
}

.primary {
  background: var(--accent);
  color: #f4fff8;
}

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

.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.ghost:hover {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.status {
  min-height: 1.35rem;
  margin: 0.65rem 0 0;
  color: var(--muted);
}

.status.error {
  color: #a8302c;
}

.hidden {
  display: none;
}

.top-space {
  margin-top: 1rem;
}

.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;
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 700px) {
  .app {
    margin: 1.1rem auto 1.5rem;
  }

  textarea,
  .output {
    min-height: 12rem;
  }
}