:root {
  --bg: #f8f8f4;
  --surface: #ffffff;
  --ink: #111111;
  --muted: #5d5d5d;
  --line: #d8d8cf;
  --accent: #1d6b53;
  --radius: 14px;
  --shadow: 0 12px 36px rgba(17, 17, 17, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 20%, rgba(29, 107, 83, 0.08) 0, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(17, 17, 17, 0.06) 0, transparent 35%),
    var(--bg);
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(17, 17, 17, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 17, 17, 0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, black 52%, transparent 100%);
}

.container {
  width: min(1000px, 100% - 2.4rem);
  margin: 2.4rem auto;
  position: relative;
  z-index: 1;
}

.panel {
  background: color-mix(in oklab, var(--surface) 92%, #fafaf3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.3rem;
  backdrop-filter: blur(2px);
  animation: rise 480ms ease-out;
}

.panel-header {
  margin-bottom: 1rem;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
  color: var(--muted);
}

h1 {
  margin: 0.3rem 0 0;
  font-size: clamp(1.8rem, 2.5vw, 2.3rem);
  letter-spacing: -0.03em;
}

.subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

#convert-form {
  display: grid;
  gap: 0.8rem;
}

.field {
  display: grid;
  gap: 0.42rem;
}

label {
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.72rem 0.82rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
  outline: none;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

textarea {
  resize: vertical;
  min-height: 84px;
}

select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 26%, white);
}

.status {
  min-height: 1.3rem;
  margin: 0.7rem 0 0.3rem;
  color: #9b1b1b;
  font-size: 0.92rem;
}

.results {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.result-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #fff, #f9f9f6);
  padding: 0.86rem;
  animation: fade 260ms ease-out;
}

.result-card h2 {
  margin: 0 0 0.62rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.result-item {
  margin: 0.28rem 0;
  display: grid;
  gap: 0.08rem;
}

.result-item .k {
  font-size: 0.73rem;
  color: var(--muted);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.result-item .v {
  font-family: "Noto Sans SC", sans-serif;
  font-size: 0.92rem;
  word-break: break-word;
}

.copy-toast {
  position: fixed;
  z-index: 20;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: 0.36rem 0.58rem;
  font-size: 0.8rem;
  opacity: 0;
  transform: translateY(4px) scale(0.98);
  transition: opacity 140ms ease, transform 140ms ease;
  pointer-events: none;
  white-space: nowrap;
}

.copy-toast.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(7px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@media (max-width: 860px) {
  .results {
    grid-template-columns: 1fr;
  }
}