:root {
  color-scheme: light;
  --bg: #f3f6f8;
  --panel: #ffffff;
  --panel-soft: #f8fafb;
  --text: #142129;
  --muted: #60717d;
  --line: #d8e1e7;
  --accent: #0f7b8a;
  --accent-dark: #075966;
  --accent-soft: #dff3f5;
  --warn: #b35322;
  --danger: #b42335;
  --shadow: 0 16px 40px rgba(20, 33, 41, 0.08);
  --font-sans: Inter, "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei",
    "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC",
    Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Mono", "Cascadia Code", Consolas,
    "Liberation Mono", Menlo, "Microsoft YaHei UI", "Microsoft YaHei",
    monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
}

button,
input,
textarea {
  font: inherit;
}

.app-shell {
  width: min(1440px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  font-weight: 760;
  letter-spacing: 0;
}

h2 {
  font-size: 16px;
  font-weight: 720;
  letter-spacing: 0;
}

.topbar p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.status-pill,
.mini-badge {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
  overflow-x: auto;
}

.tab-button {
  min-height: 40px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 8px 14px 10px;
  cursor: pointer;
  font-weight: 720;
  white-space: nowrap;
}

.tab-button.active {
  color: var(--accent-dark);
  border-color: var(--accent);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.92fr) minmax(0, 1.55fr);
  gap: 16px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.input-panel,
.output-panel,
.wide-panel {
  padding: 18px;
}

.wide-panel {
  margin-top: 16px;
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  padding: 10px 11px;
  font-family: var(--font-mono);
  font-size: 14px;
  outline: none;
}

textarea {
  min-height: 128px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 123, 138, 0.14);
}

.field-row {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 12px;
  margin-top: 12px;
}

.input-panel > label {
  margin-top: 12px;
}

.subtool-panel {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 12px;
}

.subtool-title {
  color: var(--text);
  font-size: 13px;
  font-weight: 780;
}

.action-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.compact-actions {
  margin-top: 12px;
}

button {
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  min-height: 38px;
  padding: 8px 12px;
  font-weight: 760;
}

.primary-button {
  background: var(--accent);
  color: #ffffff;
}

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

.secondary-button {
  background: var(--accent-soft);
  color: var(--accent-dark);
  border-color: #b8dfe4;
}

.danger-button {
  background: #fff0f1;
  color: var(--danger);
  border-color: #f2c7cd;
}

.icon-button {
  width: 34px;
  height: 34px;
  padding: 0;
  background: var(--panel-soft);
  border-color: var(--line);
  color: var(--accent-dark);
  font-size: 18px;
}

.hint {
  margin-top: 10px;
  color: var(--muted);
  font-size: 12px;
}

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

.result-item {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel-soft);
  padding: 10px;
}

.result-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
}

.result-value {
  margin-top: 5px;
  overflow-wrap: anywhere;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
}

.result-item.full {
  grid-column: 1 / -1;
}

.mini-result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 10px;
}

.mini-result-item {
  min-width: 0;
  border: 1px solid #cddbe1;
  border-radius: 6px;
  background: #ffffff;
  padding: 8px 9px;
}

.mini-result-label {
  color: var(--muted);
  font-size: 11px;
  font-weight: 760;
}

.mini-result-value {
  margin-top: 3px;
  overflow-wrap: anywhere;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
  background: var(--panel);
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 12px;
}

td {
  font-family: var(--font-mono);
  font-size: 13px;
  overflow-wrap: anywhere;
}

tr:last-child td {
  border-bottom: 0;
}

.binary-block {
  min-height: 148px;
  margin: 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0e1d25;
  color: #d7f4ee;
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
}

.mark-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.5fr) minmax(320px, 1.5fr);
  gap: 14px;
  align-items: start;
}

.mark-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.mark-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 12px;
}

.mark-card h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.mark-card pre {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}

.error {
  color: var(--warn);
  font-weight: 760;
}

@media (max-width: 900px) {
  .tool-grid,
  .mark-grid,
  .field-row {
    grid-template-columns: 1fr;
  }

  .result-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 20px, 1440px);
    padding-top: 14px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    font-size: 23px;
  }

  .input-panel,
  .output-panel,
  .wide-panel {
    padding: 14px;
  }
}