:root {
  --bg: #eff3f8;
  --surface: #ffffff;
  --ink: #11243d;
  --muted: #4f647f;
  --line: #d4dee9;
  --brand: #0d9488;
  --brand-hover: #0b7a70;
  --brand-soft: #dbf3ef;
  --ok-bg: #edfdf5;
  --ok-line: #9bd8bc;
  --warn-bg: #fff8e8;
  --warn-line: #f4cf74;
  --err-bg: #fff1f2;
  --err-line: #f5b3bd;
  --snippet-bg: #0f1f35;
  --snippet-ink: #e8f1ff;
  --mark: #f4cc62;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "MiSans", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background:
    linear-gradient(145deg, rgba(13, 148, 136, 0.08), transparent 30%),
    linear-gradient(15deg, rgba(17, 36, 61, 0.06), transparent 35%),
    var(--bg);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 26px 16px 30px;
}

.page-header {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 18px 14px;
  display: grid;
  gap: 14px;
  box-shadow: 0 8px 24px rgba(13, 28, 46, 0.06);
  justify-items: center;
  text-align: center;
}

.eyebrow {
  margin: 0;
  color: var(--brand);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 4px 0 6px;
  font-size: 30px;
  line-height: 1.2;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.meta span {
  background: #f6f9fc;
  color: #2d4667;
  border: 1px solid #deebf8;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
}

.tools {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.panel {
  min-height: 400px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  box-shadow: 0 8px 24px rgba(13, 28, 46, 0.05);
}

h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.2;
}

form {
  display: grid;
  gap: 10px;
}

label {
  color: var(--muted);
  font-size: 14px;
}

input {
  width: 100%;
  background: #fbfdff;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  font-size: 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.14);
}

button {
  width: fit-content;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 16px;
  cursor: pointer;
  letter-spacing: 0;
  transition: background-color 0.2s ease, transform 0.08s ease;
}

button:hover {
  background: var(--brand-hover);
}

button:active {
  transform: translateY(1px);
}

.result {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  padding: 10px 11px;
  min-height: 110px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.result.loading {
  background: var(--brand-soft);
  border-color: #a8dfd8;
}

.result.ok {
  background: var(--ok-bg);
  border-color: var(--ok-line);
}

.result.warn {
  background: var(--warn-bg);
  border-color: var(--warn-line);
}

.result.err {
  background: var(--err-bg);
  border-color: var(--err-line);
}

.snippet {
  margin-top: 8px;
  background: var(--snippet-bg);
  color: var(--snippet-ink);
  border: 1px solid #2b4466;
  border-radius: 7px;
  padding: 10px;
  font-family: "Cascadia Mono", "Consolas", monospace;
  font-size: 17px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

mark {
  background: var(--mark);
  color: #342400;
  border-radius: 3px;
  padding: 0 2px;
}

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

  .panel {
    min-height: auto;
  }
}

@media (max-width: 560px) {
  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

  .container {
    padding: 14px 10px 22px;
  }

  .snippet {
    font-size: 16px;
  }
}