:root {
  /* Light theme (default) */
  --bg-body: #faf9f5;
  --bg-card: #ffffff;
  --bg-card-soft: #141413;
  --bg-input: #faf9f5;
  --border-color: #e8e6dc;
  --border-hover: #d4d2c8;
  --text-primary: #141413;
  --text-secondary: #8a8880;
  --text-muted: #b0aea5;
  --btn-primary-bg: #141413;
  --btn-primary-hover: #2d2d2b;
  --btn-secondary-border: #141413;
  --btn-secondary-hover-bg: #141413;
  --btn-secondary-hover-text: #faf9f5;
  --progress-bg: #e8e6dc;
  --table-header-bg: rgba(232, 230, 220, 0.5);
  --hover-bg: rgba(232, 230, 220, 0.3);
  --tooltip-bg: #141413;
  --tooltip-text: #faf9f5;
  --scrollbar-track: #e8e6dc;
  --scrollbar-thumb: #b0aea5;
  --scrollbar-hover: #141413;
  --shadow-color: rgba(20, 20, 19, 0.08);
  --over-budget-bg: rgba(239, 68, 68, 0.05);
  color-scheme: light;
}

[data-theme="dark"] {
  --bg-body: #0a0a09;
  --bg-card: #141413;
  --bg-card-soft: #1c1c1a;
  --bg-input: #141413;
  --border-color: #2a2a28;
  --border-hover: #3a3a38;
  --text-primary: #faf9f5;
  --text-secondary: #8a8880;
  --text-muted: #6a6a62;
  --btn-primary-bg: #d97757;
  --btn-primary-hover: #c5634a;
  --btn-secondary-border: #2a2a28;
  --btn-secondary-hover-bg: #1c1c1a;
  --btn-secondary-hover-text: #faf9f5;
  --progress-bg: #2a2a28;
  --table-header-bg: #141413;
  --hover-bg: rgba(217, 119, 87, 0.05);
  --tooltip-bg: #1c1c1a;
  --tooltip-text: #faf9f5;
  --scrollbar-track: #1c1c1a;
  --scrollbar-thumb: #3a3a38;
  --scrollbar-hover: #4a4a48;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --over-budget-bg: rgba(239, 68, 68, 0.1);
  color-scheme: dark;
}

body {
  font-family: 'Lora', Georgia, serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}
h1, h2, h3, h4, h5, h6, .font-heading {
  font-family: 'Poppins', Arial, sans-serif;
}
.tooltip { position: relative; cursor: pointer; }
.tooltip:hover .tooltip-content,
.tooltip.active .tooltip-content { display: block; }
.tooltip-content {
  display: none;
  position: absolute;
  left: 0;
  top: 100%;
  margin-top: 8px;
  background: var(--tooltip-bg);
  color: var(--tooltip-text);
  padding: 16px;
  border-radius: 12px;
  font-size: 13px;
  white-space: nowrap;
  z-index: 50;
  box-shadow: 0 8px 30px var(--shadow-color);
  border: 1px solid var(--border-color);
  max-height: 60vh;
  overflow-y: auto;
}
@media (max-width: 640px) {
  .tooltip-content {
    position: fixed;
    left: 16px;
    right: 16px;
    top: auto;
    bottom: 16px;
    white-space: normal;
    max-height: 50vh;
  }
  .tooltip-content::before { display: none; }
}
.tooltip-content::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 16px;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 6px solid var(--tooltip-bg);
}
.btn-primary {
  background-color: var(--btn-primary-bg);
  color: #faf9f5;
  transition: all 0.2s ease;
}
.btn-primary:hover {
  background-color: var(--btn-primary-hover);
}
.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--btn-secondary-border);
  transition: all 0.2s ease;
}
.btn-secondary:hover {
  background-color: var(--btn-secondary-hover-bg);
  color: var(--btn-secondary-hover-text);
}
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}
.card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 8px 30px var(--shadow-color);
}
.progress-bar {
  background-color: var(--progress-bg);
}
.progress-fill {
  background-color: #d97757;
  transition: width 0.3s ease;
}
.progress-fill.over-budget {
  background-color: #c94a3a;
}
.input-field {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: all 0.2s ease;
}
.input-field:focus {
  border-color: #d97757;
  outline: none;
  box-shadow: 0 0 0 2px rgba(217, 119, 87, 0.2);
}
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.bg-body { background-color: var(--bg-body); }
.bg-card { background-color: var(--bg-card); }
.border-theme { border-color: var(--border-color); }
.table-header { background-color: var(--table-header-bg); }
.hover-row:hover { background-color: var(--hover-bg); }
.over-budget-row { background-color: var(--over-budget-bg); }

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

/* Theme toggle button */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  transition: all 0.2s ease;
}
.theme-toggle:hover {
  border-color: #d97757;
  color: #d97757;
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
}
.icon-sun, .icon-moon { display: none; }
:root .icon-moon { display: block; }
:root .icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* Brand colors */
.text-brand-orange { color: #d97757; }
.text-brand-blue { color: #6a9bcc; }
.text-brand-green { color: #788c5d; }
.bg-brand-orange { background-color: #d97757; }
.bg-brand-blue { background-color: #6a9bcc; }
.bg-brand-green { background-color: #788c5d; }

/* Quick date buttons */
.quick-date-btn {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all 0.2s ease;
}
.quick-date-btn:hover {
  border-color: #d97757;
  color: #d97757;
}
.quick-date-btn.active {
  background-color: #d97757;
  border-color: #d97757;
  color: #faf9f5;
}

/* Skeleton loading animation */
@keyframes skeleton-loading {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}
.skeleton {
  background: linear-gradient(
    90deg,
    var(--progress-bg) 0%,
    var(--border-hover) 50%,
    var(--progress-bg) 100%
  );
  background-size: 200px 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: 8px;
}
.skeleton-text {
  height: 1em;
  margin-bottom: 0.5em;
}
.skeleton-text:last-child {
  margin-bottom: 0;
}