:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --line: #e2e8f0;
  --text: #0f172a;
  --text-soft: #334155;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #16a34a;
  --content-width: 1200px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

.container {
  width: min(var(--content-width), calc(100vw - 32px));
  margin: 0 auto;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.site-header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
}

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

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

.nav-link {
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--text-soft);
}

.nav-link.active,
.nav-link:hover {
  color: var(--primary);
  background: #eff6ff;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--primary);
  border-radius: 10px;
  color: #ffffff;
  background: var(--primary);
  cursor: pointer;
  transition: 0.15s ease;
}

.button:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

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

.button.ghost:hover {
  background: #eff6ff;
}

.button.secondary {
  color: #ffffff;
  border-color: #475569;
  background: #475569;
}

.button.secondary:hover {
  border-color: #334155;
  background: #334155;
}

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

.button.danger:hover {
  border-color: var(--danger-hover);
  background: var(--danger-hover);
}

.page-main {
  padding: 24px 0 32px;
}

.page-intro {
  margin-bottom: 20px;
}

.page-title,
.panel-title,
.tool-title {
  margin: 0;
}

.page-title {
  font-size: 28px;
}

.page-desc,
.panel-desc,
.tool-text,
.card-text,
.meta-text {
  margin: 8px 0 0;
  color: var(--text-muted);
  line-height: 1.7;
}

.tool-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.sidebar-card,
.panel-card,
.tool-card,
.footer-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.sidebar-card,
.panel-card,
.tool-card {
  padding: 20px;
}

.sidebar-title {
  margin: 0 0 12px;
  font-size: 16px;
}

.category-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.category-item {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-soft);
}

.category-item.active,
.category-item:hover {
  color: var(--primary);
  background: #eff6ff;
}

.tool-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tool-card {
  display: grid;
  gap: 12px;
}

a.tool-card {
  color: inherit;
}

.tool-card-link {
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.tool-card-link:hover {
  border-color: #bfdbfe;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.12);
  transform: translateY(-1px);
}

.tool-card-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.tool-tag,
.tool-status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12px;
}

.tool-tag {
  color: var(--primary);
  background: #eff6ff;
}

.tool-status {
  color: var(--success);
  background: #f0fdf4;
}

.tool-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.empty-state {
  padding: 16px;
  border-radius: 12px;
  border: 1px dashed var(--line);
  color: var(--text-muted);
  background: var(--panel-soft);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.95fr);
  gap: 20px;
  align-items: start;
}

.panel-card-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.site-footer {
  padding-bottom: 32px;
}

.footer-card {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-card p {
  margin: 0;
  color: var(--text-muted);
}

@media (max-width: 960px) {
  .tool-layout,
  .content-grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .site-header-inner,
  .footer-card {
    flex-direction: column;
    align-items: start;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(var(--content-width), calc(100vw - 24px));
  }

  .sidebar-card,
  .panel-card,
  .tool-card {
    padding: 16px;
  }

  .page-title {
    font-size: 24px;
  }
}