:root {
  --ink: #e8fff6;
  --muted: #9fb9b0;

  --green: #00ff9c;
  --green-soft: #00ff9c33;
  --green-dark: #00b86f;

  --page: #0b0f19;
  --surface: #020409;
  --surface-raised: #0d1520;
  --line: #00ff9c33;
  --error: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.55 monospace;
}

main,
footer {
  max-width: 720px;
  margin: auto;
  padding: 2.5rem 1.4rem;
}

header {
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.mark {
  color: var(--green);
  font: 700 3.5rem/.9 Georgia, serif;
  letter-spacing: -0.08em;
  text-shadow: 0 0 20px var(--green-soft);
}

header p {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tool {
  margin: 2.4rem 0;
  padding: 1.7rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 0 40px var(--green-soft);
}

h1,
h2,
h3 {
  color: #ffffff;
  font-family: Georgia, serif;
}

h1 {
  margin: 0 0 0.7rem;
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.15;
}

h2 {
  margin: 2.8rem 0 0.6rem;
  font-size: 1.5rem;
  font-weight: 600;
}

h3 {
  margin: 1.6rem 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.intro,
.hint {
  color: var(--muted);
}

form {
  margin-top: 1.4rem;
}

.file {
  display: block;
  padding: 1rem;
  border: 1px dashed var(--green-dark);
  background: var(--surface-raised);
  cursor: pointer;
}

.file:hover {
  border-color: var(--green);
}

.file input {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--ink);
}

.file small {
  display: block;
  color: var(--muted);
}

.public {
  display: block;
  margin: 1rem 0;
  font-size: 0.9rem;
}

button {
  padding: 0.7rem 1.1rem;
  border: 1px solid var(--green);
  border-radius: 3px;
  background: var(--green);
  color: #020409;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: #00ffcc;
  box-shadow: 0 0 20px var(--green-soft);
}

button:disabled {
  opacity: 0.65;
  cursor: wait;
}

.score {
  margin-top: 1.5rem;
  padding: 1rem;
  border-left: 4px solid var(--green);
  background: var(--surface-raised);
}

.score strong {
  display: block;
  color: var(--green);
  font: 700 3rem/1 Georgia, serif;
  text-shadow: 0 0 20px var(--green-soft);
}

.score span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.score p {
  margin: 0.5rem 0 0;
}

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

ol {
  margin: 1rem 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0.15rem;
  border-bottom: 1px solid var(--line);
}

li b {
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

a {
  color: var(--green);
}

a:hover {
  color: #00ffcc;
}

footer {
  padding-top: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 480px) {
  main {
    padding: 1.7rem 1rem;
  }

  .tool {
    padding: 1.2rem;
  }

  h1 {
    font-size: 1.7rem;
  }
}