/* =============================================
   码者吧反向工具箱 - 全局样式
   mzhe8.com
   ============================================= */

/* === 亮色主题（默认） === */
:root {
  --bg-primary: #f5f7fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f4ff;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --accent: #3b6fe0;
  --accent-light: #5b8def;
  --accent-glow: rgba(59, 111, 224, 0.08);
  --accent-green: #16a34a;
  --accent-orange: #d97706;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --code-bg: #f1f5f9;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-glow: 0 4px 32px rgba(59,111,224,0.1);
  --radius-card: 16px;
  --radius-input: 10px;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  --navbar-bg: rgba(255,255,255,0.82);
  --result-header-bg: rgba(0,0,0,0.02);
  --result-count-bg: rgba(0,0,0,0.015);
}

/* === 暗色主题 === */
[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #161b27;
  --bg-card: #1a2035;
  --bg-card-hover: #1e2640;
  --border-color: #2a3350;
  --border-hover: #3d4f7a;
  --accent: #4f80ff;
  --accent-light: #6b96ff;
  --accent-glow: rgba(79, 128, 255, 0.15);
  --accent-green: #22c55e;
  --accent-orange: #f59e0b;
  --text-primary: #e8edf5;
  --text-secondary: #8a96b0;
  --text-muted: #5a6480;
  --code-bg: #111827;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(79,128,255,0.12);
  --navbar-bg: rgba(15,17,23,0.85);
  --result-header-bg: rgba(255,255,255,0.02);
  --result-count-bg: rgba(255,255,255,0.01);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

/* =============================================
   导航栏
   ============================================= */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navbar-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.navbar-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent) 0%, #7c5cfc 100%);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
  flex-shrink: 0;
}

.navbar-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.navbar-title span {
  color: var(--accent);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.navbar-nav a {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  background: var(--bg-card);
  color: var(--text-primary);
}

.navbar-nav a.active {
  color: var(--accent-light);
}

/* =============================================
   主体布局
   ============================================= */
.main-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* =============================================
   Hero 区域
   ============================================= */
.hero {
  text-align: center;
  padding: 72px 0 60px;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse at center, rgba(79,128,255,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-glow);
  border: 1px solid rgba(79,128,255,0.3);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-light);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent) 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* =============================================
   工具卡片网格
   ============================================= */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 28px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, #7c5cfc 100%);
  opacity: 0;
  transition: opacity var(--transition);
}

.tool-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.tool-card-icon.blue {
  background: rgba(79,128,255,0.15);
  border: 1px solid rgba(79,128,255,0.3);
}

.tool-card-icon.purple {
  background: rgba(124,92,252,0.15);
  border: 1px solid rgba(124,92,252,0.3);
}

.tool-card-icon.green {
  background: rgba(34,197,94,0.12);
  border: 1px solid rgba(34,197,94,0.25);
}

.tool-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.tool-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.tool-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 4px;
}

.tool-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(79,128,255,0.1);
  border: 1px solid rgba(79,128,255,0.2);
  color: var(--accent-light);
  letter-spacing: 0.3px;
}

.tool-tag.green {
  background: rgba(34,197,94,0.1);
  border-color: rgba(34,197,94,0.2);
  color: #4ade80;
}

.tool-card-arrow {
  position: absolute;
  top: 24px;
  right: 24px;
  color: var(--text-muted);
  font-size: 20px;
  transition: color var(--transition), transform var(--transition);
}

.tool-card:hover .tool-card-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* =============================================
   工具页面通用
   ============================================= */
.tool-page-header {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.tool-page-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.tool-page-breadcrumb a {
  color: var(--accent);
  text-decoration: none;
}

.tool-page-breadcrumb a:hover { text-decoration: underline; }

.tool-page-breadcrumb span { color: var(--text-muted); }

.tool-page-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.8px;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.tool-page-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 600px;
}

/* 使用说明面板 */
.usage-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 32px;
}

.usage-panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
  cursor: pointer;
  user-select: none;
}

.usage-panel-header .icon {
  color: var(--accent);
  font-size: 16px;
}

.usage-panel-header .toggle {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.usage-panel.collapsed .toggle {
  transform: rotate(-90deg);
}

.usage-body {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.usage-body.hidden {
  display: none;
}

.usage-body ol, .usage-body ul {
  padding-left: 20px;
}

.usage-body li {
  margin-bottom: 6px;
}

.usage-body code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  padding: 1px 6px;
  border-radius: 4px;
  color: #93c5fd;
}

/* =============================================
   表单控件
   ============================================= */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

textarea.form-input,
input.form-input {
  width: 100%;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 14px 16px;
  resize: vertical;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  line-height: 1.6;
}

textarea.form-input:focus,
input.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea.form-input::placeholder,
input.form-input::placeholder {
  color: var(--text-muted);
}

/* =============================================
   按钮
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-light);
  box-shadow: 0 4px 16px rgba(79,128,255,0.4);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.btn-icon {
  padding: 8px 14px;
  font-size: 13px;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.btn-copy:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--accent-glow);
}

/* 结果区操作按钮容器 */
.result-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* 格式切换按钮 */
.btn-format-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-muted);
  transition: all var(--transition);
}

.btn-format-toggle:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--accent-glow);
}

.btn-format-toggle:active {
  transform: scale(0.95);
}

/* 格式切换按钮 - 当前激活状态 */
.btn-format-toggle.format-prefix {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-format-toggle.format-mask {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

.btn-copy.copied {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: rgba(34,197,94,0.1);
}

.btn-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* =============================================
   结果输出框
   ============================================= */
.result-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  overflow: hidden;
  margin-bottom: 20px;
}

.result-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  background: var(--result-header-bg);
}

.result-block-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.result-dot.blue { background: var(--accent); }
.result-dot.green { background: var(--accent-green); }
.result-dot.orange { background: var(--accent-orange); }

.result-block pre {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  padding: 18px;
  line-height: 1.7;
  overflow-x: auto;
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.result-count {
  font-size: 11px;
  color: var(--text-muted);
  padding: 8px 18px;
  border-top: 1px solid var(--border-color);
  background: var(--result-count-bg);
}

/* =============================================
   分隔线布局（左右两栏）
   ============================================= */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.panel-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 24px;
}

.panel-box-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* =============================================
   JSON 树形视图
   ============================================= */
.json-tree-container {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  overflow: auto;
  max-height: 520px;
  padding: 4px 0;
}

.json-tree-node {
  cursor: default;
  user-select: none;
}

.json-tree-line {
  display: flex;
  align-items: baseline;
  gap: 0;
  padding: 1px 12px;
  border-radius: 5px;
  transition: background 0.15s;
  cursor: pointer;
  position: relative;
}

.json-tree-line:hover {
  background: rgba(79,128,255,0.12);
}

.json-tree-line.selected {
  background: rgba(79,128,255,0.2);
}

.json-tree-line.selected::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
}

.json-indent { display: inline-block; width: 20px; flex-shrink: 0; }
.json-toggle { color: var(--text-muted); width: 14px; display: inline-block; text-align: center; cursor: pointer; }
.json-key { color: #93c5fd; }
.json-colon { color: var(--text-muted); margin-right: 4px; }
.json-string { color: #86efac; }
.json-number { color: #fb923c; }
.json-bool { color: #c084fc; }
.json-null { color: var(--text-muted); }
.json-bracket { color: var(--text-muted); }
.json-type-badge {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
  opacity: 0.6;
  font-weight: 600;
}

/* JSONPath 结果栏 */
.jsonpath-result-bar {
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: var(--radius-input);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  box-shadow: 0 0 16px rgba(79,128,255,0.12);
}

.jsonpath-value {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-light);
  font-weight: 600;
  word-break: break-all;
}

.jsonpath-hint {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}

/* =============================================
   提示消息
   ============================================= */
.alert {
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 14px;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-error {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.25);
  color: #fca5a5;
}

.alert-info {
  background: var(--accent-glow);
  border: 1px solid rgba(79,128,255,0.25);
  color: #93c5fd;
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 32px 24px;
  text-align: center;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--text-secondary); }

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
}

/* =============================================
   工具输入区
   ============================================= */
.tool-workspace {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.tool-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.cidr-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* =============================================
   动画
   ============================================= */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.fade-in { animation: fadeIn 0.35s cubic-bezier(0.16,1,0.3,1) both; }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 768px) {
  .two-col,
  .cidr-results-grid {
    grid-template-columns: 1fr;
  }

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

  .hero { padding: 48px 0 36px; }

  .navbar-nav { display: none; }

  .main-wrapper { padding: 32px 16px 64px; }
}

/* =============================================
   自定义滚动条
   ============================================= */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* =============================================
   加载状态
   ============================================= */
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* empty state */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.empty-state .icon { font-size: 40px; margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 14px; }

/* =============================================
   主题切换按钮
   ============================================= */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-secondary);
  transition: all var(--transition);
  flex-shrink: 0;
  padding: 0;
  line-height: 1;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.theme-toggle:active {
  transform: scale(0.92);
}

/* 亮色模式特定微调 */
:root .json-tree-line:hover {
  background: rgba(59,111,224,0.06);
}
:root .json-tree-line.selected {
  background: rgba(59,111,224,0.1);
}
:root .json-tree-container {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
}
:root .json-key { color: #1d4ed8; }
:root .json-string { color: #15803d; }
:root .json-number { color: #b45309; }
:root .json-bool { color: #7c3aed; }
:root .usage-body code { color: #1d4ed8; }
:root .alert-error { color: #dc2626; background: rgba(239,68,68,0.06); border-color: rgba(239,68,68,0.2); }
:root .alert-info { color: #2563eb; }
:root .path-node-value { background: rgba(0,0,0,0.03); }
:root .json-select-btn { background: rgba(59,111,224,0.06); border-color: rgba(59,111,224,0.25); color: #3b6fe0; }
:root .json-select-btn:hover { background: rgba(59,111,224,0.12); }
:root .tool-tag { color: #3b6fe0; }
:root .tool-tag.green { color: #16a34a; }
:root .jsonpath-value { color: #3b6fe0; }
:root .tool-page-breadcrumb a { color: #3b6fe0; }

/* =============================================
   Modbus RTU 工具专用样式
   ============================================= */

/* Tab 切换栏 */
.modbus-tabs {
  display: flex;
  gap: 4px;
  padding: 5px;
  background: var(--code-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.modbus-tab {
  flex: 1;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
  text-align: center;
  user-select: none;
}

.modbus-tab:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.modbus-tab.active {
  background: var(--bg-card);
  color: var(--accent);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border: 1px solid var(--border-color);
}

/* Tab 面板 */
.modbus-tab-panel {
  display: none;
}

.modbus-tab-panel.active {
  display: block;
  animation: fadeIn 0.3s cubic-bezier(0.16,1,0.3,1) both;
}

/* 表单行 */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-row-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.form-row > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label,
.form-row-3 label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.form-row input[type="number"],
.form-row input[type="text"],
.form-row select {
  padding: 10px 14px;
  border-radius: var(--radius-input);
  border: 1px solid var(--border-color);
  background: var(--code-bg);
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-row input:focus,
.form-row select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-row select {
  cursor: pointer;
  min-width: 0;
}

/* 寄存器数据行 */
.reg-row {
  display: grid;
  grid-template-columns: 1fr 140px 130px 80px auto;
  gap: 10px;
  align-items: end;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.reg-row:last-child {
  border-bottom: none;
}

.reg-row > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.reg-row label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.reg-row input,
.reg-row select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--code-bg);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.reg-row input:focus,
.reg-row select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.reg-row select {
  min-width: 0;
}

.btn-remove-reg {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.btn-remove-reg:hover {
  border-color: #ef4444;
  color: #ef4444;
  background: rgba(239,68,68,0.08);
}

/* 自定义解析规则行 */
.parse-rule-row {
  display: grid;
  grid-template-columns: 100px 140px 1fr auto;
  gap: 10px;
  align-items: end;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

.parse-rule-row:last-child {
  border-bottom: none;
}

.parse-rule-row > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.parse-rule-row label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.parse-rule-row input,
.parse-rule-row select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--code-bg);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.parse-rule-row input:focus,
.parse-rule-row select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.parse-rule-row select {
  min-width: 0;
}

/* 报文结构表 */
.frame-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.frame-table th {
  text-align: left;
  padding: 10px 14px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--code-bg);
  border-bottom: 1px solid var(--border-color);
}

.frame-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.frame-table tr:last-child td {
  border-bottom: none;
}

.frame-table .field-name {
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.frame-table .field-hex {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
}

/* 解析结果表 */
.parse-result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.parse-result-table th {
  text-align: left;
  padding: 10px 14px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--code-bg);
  border-bottom: 1px solid var(--border-color);
}

.parse-result-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.parse-result-table tr:last-child td {
  border-bottom: none;
}

.parse-result-table .val-cell {
  font-family: var(--font-mono);
  font-size: 13px;
  white-space: pre;
  line-height: 1.7;
}

.parse-result-table .val-cell span {
  color: var(--text-muted);
  font-size: 12px;
}

/* CRC 显示 */
.crc-display {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 4px;
  margin-bottom: 12px;
}

.crc-detail {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-secondary);
}

/* 数字模式切换 */
.num-mode-toggle {
  display: flex;
  gap: 2px;
  padding: 3px;
  background: var(--code-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.num-mode-btn {
  padding: 7px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-muted);
  transition: all var(--transition);
  user-select: none;
}

.num-mode-btn:hover {
  color: var(--text-secondary);
}

.num-mode-btn.active {
  background: var(--bg-card);
  color: var(--accent);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

/* Modbus 响应式 */
@media (max-width: 768px) {
  .modbus-tabs {
    flex-wrap: wrap;
  }

  .modbus-tab {
    font-size: 12px;
    padding: 8px 10px;
  }

  .form-row,
  .form-row-3 {
    grid-template-columns: 1fr;
  }

  .reg-row {
    grid-template-columns: 1fr 1fr;
  }

  .reg-row > div:nth-child(n+3) {
    grid-column: span 1;
  }

  .parse-rule-row {
    grid-template-columns: 1fr 1fr;
  }

  .crc-display {
    font-size: 24px;
    letter-spacing: 2px;
  }
}

/* body 平滑过渡 */
body {
  transition: background-color 0.3s ease, color 0.3s ease;
}
.navbar, .tool-card, .panel-box, .result-block, .usage-panel, .path-result-item,
textarea.form-input, input.form-input, .btn-secondary, .btn-copy, .btn-format-toggle, .theme-toggle {
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
}

/* === 线圈状态切换按钮 (FC05 写单个线圈) === */
.coil-state-toggle{display:inline-flex;gap:2px;background:var(--code-bg);border-radius:8px;padding:2px;width:100%}
.coil-state-btn{flex:1;padding:9px 14px;border:none;border-radius:6px;font-size:13px;font-weight:600;cursor:pointer;background:transparent;color:var(--text-muted);transition:all var(--transition);text-align:center}
.coil-state-btn.on.active{background:#16a34a;color:#fff;box-shadow:0 1px 6px rgba(22,163,74,0.25)}
.coil-state-btn.off.active{background:var(--bg-card);color:var(--accent);box-shadow:0 1px 4px rgba(0,0,0,0.06)}
.coil-state-btn:hover:not(.active){background:var(--bg-card-hover);color:var(--text-primary)}

/* === 线圈行 (FC0F 写多个线圈) === */
.coil-row{display:grid;grid-template-columns:40px 1fr 50px;gap:10px;align-items:center;margin-bottom:8px;padding:6px 10px;background:var(--code-bg);border-radius:8px;border:1px solid var(--border-color)}
.coil-row:hover{border-color:var(--border-hover)}
.coil-row .coil-index{font-size:12px;font-weight:700;color:var(--text-muted);font-family:var(--font-mono);text-align:center}
.coil-row .coil-toggle{display:flex;gap:2px;background:var(--bg-card);border-radius:6px;padding:2px}
.coil-row .coil-btn{flex:1;padding:6px 0;border:none;border-radius:5px;font-size:12px;font-weight:600;cursor:pointer;background:transparent;color:var(--text-muted);transition:all var(--transition);text-align:center}
.coil-row .coil-btn.on.active{background:#16a34a;color:#fff}
.coil-row .coil-btn.off.active{background:var(--code-bg);color:var(--text-secondary)}
.coil-row .btn-remove-coil{width:32px;height:32px;border-radius:6px;border:1px solid rgba(239,68,68,0.25);background:rgba(239,68,68,0.08);color:#f87171;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;transition:all var(--transition)}
.coil-row .btn-remove-coil:hover{background:rgba(239,68,68,0.15);border-color:rgba(239,68,68,0.4)}

/* === 请求寄存器行 (FC10 写多个寄存器) === */
.req-reg-row{display:grid;grid-template-columns:90px 1fr 120px 120px 40px;gap:8px;align-items:end;margin-bottom:10px}
@media(max-width:640px){.req-reg-row{grid-template-columns:1fr 1fr;gap:8px}.req-reg-row>*:nth-child(5){grid-column:span 2}}
.req-reg-row label{display:block;font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:5px}
.req-reg-row select,.req-reg-row input{width:100%;background:var(--code-bg);border:1px solid var(--border-color);border-radius:8px;color:var(--text-primary);font-size:13px;padding:8px 12px;outline:none;transition:border-color var(--transition)}
.req-reg-row select:focus,.req-reg-row input:focus{border-color:var(--accent)}