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

:root {
  --primary: #4a6cf7;
  --primary-hover: #3b5de7;
  --bg: #f5f7fb;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --tag-bg: #eef2ff;
  --tag-color: #4a6cf7;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
  flex: 1;
}

/* Header */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

.site-logo img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  justify-content: flex-end;
}

.search-wrapper {
  position: relative;
  max-width: 360px;
  width: 100%;
}

.search-input {
  width: 100%;
  padding: 9px 36px 9px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.12);
}

.search-input::placeholder {
  color: var(--text-secondary);
}

.search-icon {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  color: var(--text-secondary);
  pointer-events: none;
}

.about-link {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.about-link:hover {
  background: var(--tag-bg);
  color: var(--primary);
}

/* Tool Grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 32px 0;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  box-shadow: var(--shadow);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.tool-icon {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 8px;
  background: #f5f7fa;
  flex-shrink: 0;
}

.tool-info {
  flex: 1;
  min-width: 0;
}

.tool-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.4;
}

.tool-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tool-tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--tag-bg);
  color: var(--tag-color);
  line-height: 1.6;
}

/* Loading & Empty states */
.loading, .empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 15px;
}

.hidden {
  display: none !important;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 24px 20px;
  font-size: 13px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

/* Responsive */
@media (max-width: 640px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 10px 16px;
  }

  .site-logo {
    font-size: 18px;
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
  }

  .search-wrapper {
    max-width: none;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 20px 0;
  }

  .tool-card {
    padding: 18px;
  }
}