:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2a37;
  --sub: #5b6777;
  --line: #dbe1e8;
  --primary: #1463ff;
  --primary-hover: #0f52d1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f7f9fc 0%, #f3f6fb 100%);
}

.wrap {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(5px);
}

.topbar .wrap {
  padding: 24px 0 18px;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  margin: 0;
  font-size: 28px;
}

.topbar p {
  margin: 8px 0 0;
  color: var(--sub);
}

.layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 20px;
  padding: 24px 0 40px;
  min-height: calc(100vh - 130px);
}

.nav-card,
.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
}

.nav-card {
  height: fit-content;
  padding: 16px;
  position: sticky;
  top: 14px;
}

.nav-card h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.tool-nav {
  display: grid;
  gap: 8px;
}

.tool-nav a {
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 14px;
}

.tool-nav a:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tool-nav a.active {
  border-color: var(--primary);
  background: #eef4ff;
  color: var(--primary);
}

.tools {
  display: flex;
  min-height: 0;
  width: 100%;
}

.card {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 20px;
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--sub);
  font-size: 14px;
}

textarea,
input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text);
  background: #fff;
}

textarea {
  min-height: 230px;
  resize: vertical;
  line-height: 1.5;
}

.card > textarea {
  flex: 1;
  min-height: 0;
}

textarea:focus,
input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(20, 99, 255, 0.14);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.grid-2 > div {
  display: flex;
  flex-direction: column;
}

.grid-2 textarea {
  min-height: 220px;
}

#json-tool,
#xml-tool,
#regex-tool,
#convert-tool,
#native-tool {
  min-height: calc(100vh - 210px);
}

#regex-tool #regexText {
  margin-top: 12px;
  min-height: 260px;
}

#regex-tool .result {
  min-height: 46px;
}

#convert-tool .grid-2,
#native-tool .grid-2 {
  flex: 1;
  min-height: 0;
}

#convert-tool .grid-2 > div,
#native-tool .grid-2 > div {
  min-height: 0;
}

#convert-tool .grid-2 textarea,
#native-tool .grid-2 textarea {
  flex: 1;
  min-height: 320px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

button {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 8px 14px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-size: 14px;
}

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

button.ghost {
  border-color: var(--line);
  background: #fff;
  color: var(--text);
}

button.ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.lang-toggle {
  border-color: var(--line);
  background: #fff;
  color: var(--text);
  min-width: 84px;
}

.lang-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.msg {
  margin: 10px 0 0;
  min-height: 20px;
  color: var(--sub);
  font-size: 13px;
}

.hint {
  margin: 8px 0 0;
  color: #708094;
  font-size: 12px;
  line-height: 1.5;
}

.result {
  margin-top: 10px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fbfdff;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}

.result .ok {
  color: #117534;
}

.result .err {
  color: #b42318;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .nav-card {
    position: static;
  }
}

@media (max-width: 720px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 24px;
  }
}