/* ========== CSS 变量 ========== */
:root {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --surface-alt: #f8f9fb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-hover: #15803d;
  --danger: #dc2626;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-w: 240px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ========== 全局重置 ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

/* ========== App 布局 ========== */
.app { display: flex; height: 100vh; }

/* ========== 侧边栏 ========== */
.sidebar {
  width: var(--sidebar-w);
  background: #1e293b;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}
.sidebar-logo {
  padding: 20px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.logo-icon { font-size: 24px; }
.logo-text { font-size: 16px; font-weight: 600; color: #fff; }
.sidebar-nav { flex: 1; padding: 12px 8px; overflow-y: auto; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 14px;
  border: none;
  background: transparent;
  color: #94a3b8;
  font-size: 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
  font-family: var(--font);
}
.nav-item:hover { background: rgba(255,255,255,0.06); color: #e2e8f0; }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-icon { font-size: 16px; width: 20px; text-align: center; }
.sidebar-footer { padding: 12px 18px; font-size: 12px; color: #64748b; border-top: 1px solid rgba(255,255,255,0.08); }

/* ========== 主内容区 ========== */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
}

/* ========== 模块切换 ========== */
.module { display: none; }
.module.active { display: block; animation: fadeIn 0.2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.module-header { margin-bottom: 24px; }
.module-header h1 { font-size: 24px; font-weight: 700; margin-bottom: 6px; }
.module-desc { color: var(--text-secondary); font-size: 14px; }

/* ========== 两列布局 ========== */
.module-body.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}
.col-left, .col-right { display: flex; flex-direction: column; gap: 20px; }

/* ========== 卡片 ========== */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.card-header h2 { font-size: 16px; font-weight: 600; }
.card-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.card-body { padding: 20px; }
.card-body h3 { font-size: 14px; font-weight: 600; margin-bottom: 10px; color: var(--text); }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 16px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font);
  white-space: nowrap;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--border-strong); color: var(--text); }

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

.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover { background: var(--success-hover); border-color: var(--success-hover); color: #fff; }

.btn-ghost { background: transparent; border-color: var(--border); color: var(--text-secondary); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-danger { color: var(--danger); border-color: var(--border); background: transparent; }
.btn-danger:hover { background: #fef2f2; border-color: var(--danger); color: var(--danger); }

/* ========== 表格 ========== */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); max-height: 360px; overflow-y: auto; }
.table-wrap.small { max-height: 220px; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table thead { position: sticky; top: 0; z-index: 1; }
.data-table th {
  background: var(--surface-alt);
  padding: 9px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table tbody tr:hover { background: var(--primary-light); }
.data-table .empty-row td { text-align: center; color: var(--text-light); padding: 24px; }
.data-count { margin-top: 8px; font-size: 13px; color: var(--text-secondary); }

/* 复选框列 */
.col-check { width: 40px; text-align: center; }
.col-check input[type="checkbox"] {
  width: 16px; height: 16px;
  cursor: pointer;
  accent-color: var(--primary);
  vertical-align: middle;
}
.data-table td.col-check { text-align: center; }

/* 平面度/圆度偏差单元格 */
.data-table td.dev-cell {
  font-variant-numeric: tabular-nums;
  color: var(--primary);
  font-weight: 500;
}
.data-table td.dev-cell:not(:first-child) {
  /* 正值红色，负值绿色（工程惯例：正偏差红/负偏差绿） */
}

/* ========== 结果展示 ========== */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}
.result-item {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: center;
}
.result-item label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.result-value {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

/* ========== 输入框 ========== */
input[type="number"], input[type="text"] {
  padding: 8px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font);
  width: 100%;
  transition: border-color 0.15s;
  color: var(--text);
}
input[type="number"]:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.input-row { display: flex; align-items: center; gap: 8px; }
.input-row label { font-size: 13px; font-weight: 600; color: var(--text-secondary); min-width: 18px; text-align: center; }
.input-row input { flex: 1; min-width: 0; }
.input-group { margin-bottom: 12px; }
.input-group > label { display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.mt-16 { margin-top: 16px; }

/* ========== 提示文本 ========== */
.hint { font-size: 12px; color: var(--text-light); margin-bottom: 10px; }

/* ========== Plotly 容器 ========== */
.plot-container { width: 100%; min-height: 400px; }

/* ========== 特征点转换：三组数据 ========== */
.ft-import-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.ft-import-section { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px; background: var(--surface-alt); }
.ft-section-header { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.ft-section-header h3 { margin: 0; flex: 1; }

/* ========== 计算类工具布局 ========== */
.ct-input-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.ct-point-group { background: var(--surface-alt); padding: 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.ct-dev-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.ct-dev-left, .ct-dev-right { display: flex; flex-direction: column; }

/* ========== 铰接计算 ========== */
.ar-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 20px;
  align-items: start;
}
.ar-col { display: flex; flex-direction: column; gap: 16px; }
.ar-col-right { gap: 16px; }

/* 类型选择 */
.ar-type-group {
  display: flex;
  gap: 32px;
  padding: 8px 4px;
}
.ar-radio {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
}
.ar-radio input[type="radio"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

/* 油缸参数表格 */
.ar-cyl-table-wrap { overflow-x: auto; }
.ar-cyl-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.ar-cyl-table th {
  background: var(--surface-alt);
  padding: 10px 8px;
  text-align: center;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.ar-cyl-table td {
  padding: 8px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.ar-cyl-table td:first-child {
  font-weight: 500;
  color: var(--text-secondary);
}
.ar-cyl-table input {
  width: 100%;
  min-width: 80px;
  padding: 6px 8px;
  text-align: center;
}

/* 机械参数 */
.ar-mech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.ar-mech-grid .input-group label {
  font-size: 13px;
  margin-bottom: 6px;
}

/* 坐标数据表格 */
.ar-coord-table-wrap, .ar-angle-table-wrap { overflow-x: auto; }
.ar-coord-table, .ar-angle-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.ar-coord-table th, .ar-angle-table th {
  background: var(--surface-alt);
  padding: 10px 6px;
  text-align: center;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}
.ar-coord-table td, .ar-angle-table td {
  padding: 6px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.ar-coord-table td:first-child {
  font-weight: 500;
  color: var(--text-secondary);
  text-align: left;
  padding-left: 10px;
}
.ar-coord-table input,
.ar-angle-table input {
  width: 100%;
  min-width: 70px;
  padding: 6px 6px;
  text-align: center;
}
.ar-angle-table input { background: var(--surface-alt); }

/* 禁用输入 */
.disabled-input {
  background: #e2e8f0 !important;
  color: #64748b !important;
  cursor: not-allowed;
}

/* 计算按钮居中 */
.ar-calc-wrap {
  display: flex;
  justify-content: center;
  margin: 4px 0;
}
.ar-calc-wrap .btn {
  min-width: 100px;
}

/* 右侧图表卡片 */
.ar-chart-card { overflow: hidden; }
.ar-chart-title {
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.ar-chart-title h2 {
  font-size: 15px;
  color: #0ea5e9;
  font-weight: 600;
}
.ar-chart-body {
  padding: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.ar-chart-body canvas {
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
#ar-canvas-dist { background: #1e293b; }
#ar-canvas-h, #ar-canvas-v { background: #ffffff; }

/* 响应式 */
@media (max-width: 1200px) {
  .ar-layout { grid-template-columns: 1fr 1fr; }
  .ar-col-right { grid-column: span 2; flex-direction: row; flex-wrap: wrap; }
  .ar-chart-card { flex: 1; min-width: 300px; }
}
@media (max-width: 900px) {
  .ar-layout { grid-template-columns: 1fr; }
  .ar-col-right { grid-column: span 1; flex-direction: column; }
}

/* ========== Toast 提示 ========== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: #1e293b;
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: all 0.3s;
  z-index: 9999;
  pointer-events: none;
  max-width: 400px;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ========== 响应式 ========== */
@media (max-width: 1100px) {
  .module-body.two-col { grid-template-columns: 1fr; }
  .ft-import-grid { grid-template-columns: 1fr; }
  .ct-dev-layout { grid-template-columns: 1fr; }
}