:root {
  --bg: #0f1115;
  --panel: #171a21;
  --text: #e6e6e6;
  --text-sub: #9aa0a6;
  --primary: #4fb477;
  --link: #7aa2f7;
  --border: #222;
  --card-hover: #20232b;
  --tag-bg: #2a2e36;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

header {
  background: var(--panel);
  padding: 1rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.top-nav {
    margin-bottom: 1.5rem;
}

.top-nav a {
    color: var(--text-sub);
    font-size: 0.9rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.2s;
}
.top-nav a:hover {
    color: var(--primary);
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

header p {
  color: var(--text-sub);
}

.search-bar {
  max-width: 600px;
  margin: 0 auto 2rem;
  position: relative;
}

.search-bar input {
  width: 100%;
  padding: 1rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 1rem;
  color: var(--text);
  transition: all 0.3s ease;
  outline: none;
}

.search-bar input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(79, 180, 119, 0.2);
}

.category-nav {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.category-btn {
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-sub);
  border-radius: 20px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}

.category-btn:hover, .category-btn.active {
  background: var(--primary);
  color: #0b0e13;
  border-color: var(--primary);
}

.section-title {
  margin: 3rem 0 1.5rem;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.tool-card {
  background: var(--panel);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border);
  transition: transform 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
}

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

.card-header {
  display: flex;
  align-items: flex-start;
  margin-bottom: 1rem;
  gap: 1rem;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  object-fit: cover; /* 改为 cover 防止变形 */
  background-color: #2a2e36;
  flex-shrink: 0; /* 防止图标被压缩 */
}

.card-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  margin-top: 0.2rem;
}

.card-desc {
  color: var(--text-sub);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.6;
}

.card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: auto;
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background-color: var(--tag-bg);
  color: var(--text-sub);
  border: 1px solid var(--border);
}

.tag.domestic {
  background-color: rgba(79, 180, 119, 0.1);
  color: var(--primary);
  border-color: rgba(79, 180, 119, 0.2);
}

.tag.global {
  background-color: rgba(122, 162, 247, 0.1);
  color: var(--link);
  border-color: rgba(122, 162, 247, 0.2);
}

footer {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-sub);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}