:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0f1115;
  color: #f7f7f7;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(53, 199, 89, 0.08), transparent 260px),
    #0f1115;
}

.shell {
  display: grid;
  gap: 18px;
  margin: 0 auto;
  max-width: 940px;
  padding: 24px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 18px;
  align-items: end;
}

.panel {
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  padding: 20px;
  background: #1b1d22;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: 34px;
  line-height: 1.08;
}

h2 {
  margin-bottom: 6px;
}

p {
  color: #b9bec8;
  line-height: 1.55;
}

.eyebrow {
  margin-bottom: 8px;
  color: #5ee27f;
  font-size: 13px;
  font-weight: 800;
}

.steps {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 4px 10px;
  align-items: start;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.04);
}

.steps span {
  display: grid;
  grid-row: span 2;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #35c759;
  color: #071108;
  font-weight: 900;
}

.steps strong {
  font-size: 14px;
}

.steps p {
  margin: 0;
  font-size: 12px;
}

.section-heading {
  display: flex;
  gap: 12px;
  justify-content: space-between;
  align-items: flex-start;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid rgba(53, 199, 89, 0.42);
  border-radius: 999px;
  padding: 5px 9px;
  color: #75ee91;
  font-size: 12px;
  font-weight: 800;
}

label {
  display: grid;
  gap: 6px;
  margin: 14px 0;
  font-size: 14px;
  color: #d8d8d8;
}

input {
  min-height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 6px;
  padding: 0 10px;
  background: #252830;
  color: #fff;
}

input:focus-visible,
button:focus-visible,
.drop-zone:focus-visible {
  outline: 2px solid #75ee91;
  outline-offset: 2px;
}

button {
  min-height: 38px;
  border: 0;
  border-radius: 6px;
  padding: 0 14px;
  font-weight: 700;
  background: #35c759;
  color: #071108;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.drop-zone {
  display: grid;
  justify-items: center;
  gap: 7px;
  border: 1.5px dashed rgba(117, 238, 145, 0.45);
  border-radius: 8px;
  margin: 16px 0;
  padding: 24px 16px;
  background: rgba(53, 199, 89, 0.07);
  text-align: center;
  transition: border-color 140ms ease, background 140ms ease, transform 140ms ease;
}

.drop-zone.is-dragging {
  border-color: #75ee91;
  background: rgba(53, 199, 89, 0.16);
  transform: translateY(-1px);
}

.drop-zone-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #35c759;
  color: #071108;
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
}

.drop-zone p,
.drop-zone span {
  margin: 0;
  color: #b9bec8;
}

.drop-zone span {
  font-size: 12px;
}

.file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.rules {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 12px 0;
}

.rules div {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.035);
}

.rules strong {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
}

.rules p {
  margin: 0;
  font-size: 12px;
}

.file-summary {
  border-radius: 6px;
  margin-top: 12px;
  padding: 10px;
  background: rgba(117, 238, 145, 0.1);
  color: #dfffe6;
  font-size: 13px;
}

.file-summary.is-empty {
  background: rgba(255, 255, 255, 0.06);
  color: #a6aab4;
}

.file-summary.is-error {
  background: rgba(255, 69, 58, 0.12);
  color: #ffb5ae;
}

.file-list {
  display: grid;
  gap: 6px;
  margin: 10px 0 16px;
  padding: 0;
  list-style: none;
}

.file-list li {
  display: flex;
  gap: 10px;
  justify-content: space-between;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.035);
  font-size: 13px;
}

.file-list span {
  color: #a6aab4;
  font-size: 12px;
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.hint,
output {
  display: block;
  min-height: 18px;
  margin-top: 10px;
  color: #a6a6a6;
  font-size: 13px;
}

@media (max-width: 760px) {
  .shell {
    padding: 16px;
  }

  .intro,
  .rules {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 28px;
  }

  .section-heading {
    display: grid;
  }
}