:root {
    --primary-color: #24292e;
    --secondary-color: #0366d6;
    --bg-color: #f6f8fa;
    --card-bg: #ffffff;
    --text-color: #24292e;
    --text-secondary: #586069;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    line-height: 1.5;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
}

h1, h2, h3 {
    color: var(--primary-color);
}

.search-box {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.search-box input {
    padding: 10px 15px;
    width: 300px;
    border: 1px solid #ddd;
    border-radius: 6px 0 0 6px;
    font-size: 16px;
}

.search-box button {
    padding: 10px 15px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid #e1e4e8;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.card-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    color: var(--secondary-color);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 14px;
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
    font-size: 12px;
}

.meta-item {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
}

.meta-item i {
    margin-right: 5px;
    color: var(--text-secondary);
}

.loading {
    text-align: center;
    padding: 30px;
    font-size: 18px;
    color: var(--text-secondary);
    display: none;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top: 4px solid var(--secondary-color);
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    color: #cb2431;
    background-color: #ffebee;
    padding: 15px;
    border-radius: 6px;
    margin: 20px 0;
    text-align: center;
    display: none;
}

@media (max-width: 768px) {
    .cards-container {
        grid-template-columns: 1fr;
    }

    .repo-meta {
        grid-template-columns: 1fr;
    }
}

.back-button {
  position: absolute;
  top: 10px;      /* 距离顶部20像素 */
  left: 10px;     /* 距离左侧20像素 */
  padding: 10px 20px;
  background-color: #0366d6;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

/* 悬停状态 */
.back-button:hover {
  background-color: #035fc7;
}