:root {
  --bg: #0b1020;
  --card: #11162a;
  --muted: #8ea0bf;
  --text: #e7eefc;
  --brand: #4f8cff;
  --brand-2: #7ad3ff;
  --ok: #2ecc71;
  --warn: #f39c12;
  --bad: #e74c3c;
  --border: #1b2442;
  --bg-gradient-1: #152044;
  --bg-gradient-2: #0b1a44;
  --form-bg: #0b1020;
  --button-bg: #0c1326;
  --table-header-bg: #10162a;
  --tooltip-bg: #1a2035;
  --sticky-bg: #10162a;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --card: #ffffff;
  --muted: #64748b;
  --text: #1e293b;
  --brand: #3b82f6;
  --brand-2: #0ea5e9;
  --ok: #059669;
  --warn: #d97706;
  --bad: #dc2626;
  --border: #e2e8f0;
  --bg-gradient-1: #e0e7ff;
  --bg-gradient-2: #dbeafe;
  --form-bg: #ffffff;
  --button-bg: #f1f5f9;
  --table-header-bg: #f8fafc;
  --tooltip-bg: #1e293b;
  --sticky-bg: #f8fafc;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Ubuntu, Cantarell, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg); /* 实际颜色基底 */
  transition: background-color 0.3s ease, color 0.3s ease;
  position: relative;
  min-height: 100%;
  overflow-x: hidden;
}

/* 使用固定伪元素承载渐变，避免滚动产生位移感 */
body::before {
  content: "";
  position: fixed;
  inset: 0; /* top:0;right:0;bottom:0;left:0 */
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(1200px 700px at 20% -10%, var(--bg-gradient-1), transparent 60%),
              radial-gradient(1200px 700px at 120% 10%, var(--bg-gradient-2), transparent 50%),
              var(--bg);
  background-repeat: no-repeat;
  background-attachment: fixed; /* Safari 某些版本仍需要 */
  will-change: transform; /* 提升渲染层 */
}

/* 亮色主题下替换伪元素背景为更平滑的淡色渐变 */
[data-theme="light"] body::before {
  background: radial-gradient(1000px 600px at 15% -10%, #ffffff 0%, rgba(255,255,255,0) 60%),
              radial-gradient(1200px 800px at 110% 10%, #e0f2fe 0%, rgba(255,255,255,0) 55%),
              linear-gradient(135deg, #f8fafc 0%, #eef2f7 100%);
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

header.container { padding: 28px 0 10px; }

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.header-text {
  flex: 1;
}

h1 { margin: 0 0 6px; font-size: 28px; font-weight: 700; }
.subtitle { margin: 0; color: var(--muted); line-height: 1.5; }

/* 主题切换按钮样式 */
.theme-toggle {
  display: flex;
  align-items: center;
}

.theme-toggle-btn {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  min-width: 48px;
  min-height: 48px;
}

.theme-toggle-btn:hover {
  background: var(--brand);
  border-color: var(--brand);
  transform: scale(1.05);
}

.theme-icon {
  font-size: 20px;
  display: block;
  transition: transform 0.3s ease;
}

.theme-toggle-btn:hover .theme-icon {
  transform: rotate(20deg);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.0));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

/* 亮色主题下的卡片样式 */
[data-theme="light"] .card {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.card.wide { grid-column: 1 / -1; }

/* 预设模板样式 */
.preset-templates {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.preset-templates label {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.template-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.template-btn {
  padding: 6px 12px;
  font-size: 12px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.template-btn:hover {
  background: rgba(79,140,255,0.1);
  border-color: var(--brand);
  color: var(--brand);
}

.template-btn.active {
  background: var(--brand);
  border-color: var(--brand);
  color: white;
}

form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row.checkbox { flex-direction: row; align-items: center; gap: 8px; }
.form-row label { color: var(--muted); font-size: 13px; }
input[type="number"], input[type="text"], input[type="checkbox"], select {
  padding: 10px 12px;
  background: var(--form-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

details.advanced { grid-column: 1 / -1; }
details summary { cursor: pointer; color: var(--brand-2); margin: 6px 0; }
details .form-row { margin: 6px 0; }

.actions { grid-column: 1 / -1; display: flex; gap: 10px; margin-top: 4px; }
button { cursor: pointer; border: 1px solid var(--border); color: var(--text); background: var(--button-bg); padding: 10px 14px; border-radius: 10px; transition: all 0.3s ease; }
button.primary { background: linear-gradient(180deg, #97b6ff, #9cb8ff); border: none; }
button.ghost { background: transparent; }

.form-errors { grid-column: 1 / -1; background: rgba(231,76,60,0.08); border: 1px solid #e74c3c33; color: #ffb3ac; padding: 10px 12px; border-radius: 10px; font-size: 13px; }
.form-errors ul { margin: 0; padding-left: 18px; }

.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 10px; }
.kpis { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.kpi { background: var(--form-bg); border: 1px solid var(--border); border-radius: 12px; padding: 10px; transition: background-color 0.3s ease; }
.kpi-label { font-size: 12px; color: var(--muted); }
.kpi-value { font-size: 20px; font-weight: 700; margin-top: 6px; }
.kpi-value.positive { color: var(--ok); }
.kpi-value.negative { color: var(--bad); }
.kpi-value.danger { color: var(--bad); }
.kpi-value.warning { color: var(--warn); }

.table-actions { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
thead th { position: sticky; top: 0; background: var(--table-header-bg); transition: background-color 0.3s ease; }
th, td { text-align: right; padding: 10px 12px; border-bottom: 1px solid var(--border); font-variant-numeric: tabular-nums; }
th:first-child, td:first-child { text-align: left; }
.risk { background: rgba(231,76,60,0.06); }

.prose p, .prose ul { color: var(--muted); }
.prose code { color: var(--brand-2); }

.footer { color: var(--muted); padding: 16px 0 40px; text-align: center; }

/* charts */
.chart-wrap { width: 100%; height: 300px; margin-top: 6px; border: 1px solid var(--border); border-radius: 12px; background: var(--form-bg); padding: 8px; transition: background-color 0.3s ease; }
.chart-wrap--roi { height: 220px; }
.chart-wrap canvas { width: 100% !important; height: 100% !important; display: block; }

.chart-controls { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.chart-controls .ctrl { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
.chart-controls .spacer { flex: 1; }

/* 风险警告样式 */
.risk-warning {
  background: linear-gradient(135deg, rgba(231,76,60,0.1), rgba(231,76,60,0.05));
  border: 1px solid rgba(231,76,60,0.3);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 16px;
  animation: slideIn 0.3s ease-out;
}

.warning-item {
  color: #ffb3ac;
  font-size: 14px;
  line-height: 1.4;
  margin-bottom: 8px;
}

.warning-item:last-child {
  margin-bottom: 0;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 工具提示样式 */
.tooltip {
  position: relative;
  display: inline-block;
  margin-left: 4px;
  cursor: help;
  color: var(--brand-2);
  font-size: 12px;
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.tooltip:hover {
  opacity: 1;
}

.tooltip::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--tooltip-bg);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.3;
  white-space: nowrap;
  max-width: 200px;
  white-space: normal;
  width: max-content;
  max-width: 250px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 1000;
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.tooltip::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(1px);
  border: 4px solid transparent;
  border-top-color: var(--tooltip-bg);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 1001;
}

/* 隐藏元素样式类 */
.hidden {
  display: none !important;
}

.tooltip:hover::before,
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-4px);
}

.tooltip:hover::after {
  transform: translateX(-50%) translateY(-3px);
}

/* 移动端优化 */
@media (max-width: 768px) {
  .preset-templates {
    margin-bottom: 12px;
  }
  
  .template-buttons {
    justify-content: center;
  }
  
  .template-btn {
    flex: 1;
    min-width: 0;
    text-align: center;
  }
  
  .kpis {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  
  .kpi {
    padding: 8px;
  }
  
  .kpi-value {
    font-size: 16px;
  }
  
  /* 移动端表格优化 */
  .table-wrap {
    position: relative;
  }
  
  .mobile-table-hint {
    display: block;
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    margin-bottom: 8px;
    padding: 4px 8px;
    background: rgba(79,140,255,0.1);
    border-radius: 6px;
  }
  
  table {
    font-size: 12px;
  }
  
  th, td {
    padding: 6px 4px;
    min-width: 60px;
  }
  
  th:first-child, td:first-child {
    position: sticky;
    left: 0;
    background: var(--sticky-bg);
    z-index: 1;
    min-width: 30px;
  }
  
  .chart-wrap {
    height: 250px;
  }
  
  .chart-wrap--roi {
    height: 180px;
  }
  
  .chart-controls {
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .chart-controls .ctrl {
    font-size: 12px;
  }
  
  .tooltip::before {
    left: auto;
    right: 0;
    transform: none;
    max-width: 180px;
  }
  
  .tooltip::after {
    left: auto;
    right: 10px;
    transform: translateY(1px);
  }
  
  .tooltip:hover::before {
    transform: translateY(-4px);
  }
  
  .tooltip:hover::after {
    transform: translateY(-3px);
  }
}

@media (max-width: 480px) {
  .container {
    width: 95%;
  }
  
  .header-content {
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }
  
  .header-text {
    text-align: center;
  }
  
  .theme-toggle-btn {
    min-width: 44px;
    min-height: 44px;
    padding: 10px;
  }
  
  .theme-icon {
    font-size: 18px;
  }
  
  .kpis {
    grid-template-columns: 1fr;
  }
  
  .template-buttons {
    flex-direction: column;
  }
  
  form {
    grid-template-columns: 1fr;
  }
}

/* 敏感性分析样式 */
.sensitivity-analysis {
  margin-top: 16px;
}

.sensitivity-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.sensitivity-controls label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.sensitivity-controls select {
  padding: 4px 8px;
  background: var(--form-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 12px;
  transition: background-color 0.3s ease;
}

.sensitivity-chart-wrap {
  width: 100%;
  height: 300px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--form-bg);
  padding: 8px;
  transition: background-color 0.3s ease;
}

.sensitivity-chart-wrap canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}