/* 全局重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Roboto, Arial, sans-serif; background: #f8f9fa; color: #333; line-height: 1.6; }
a { color: #0366d6; text-decoration: none; }
a:hover { text-decoration: underline; }

/* 导航栏 */
nav { background: #24292e; color: white; padding: 0.8rem 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
nav .logo { font-size: 1.5rem; font-weight: bold; color: white; }
nav .logo span { color: #f0b400; }
nav a { color: #c9d1d9; margin: 0 0.8rem; font-weight: 500; }
nav a:hover { color: white; text-decoration: none; }
nav .right { display: flex; align-items: center; gap: 0.8rem; }
nav .right .user { color: #c9d1d9; }
nav .right button { background: none; border: 1px solid #c9d1d9; color: #c9d1d9; padding: 0.2rem 0.8rem; border-radius: 4px; cursor: pointer; }
nav .right button:hover { background: #c9d1d9; color: #24292e; }

.container { max-width: 1200px; margin: 2rem auto; padding: 0 1.5rem; }
h1 { font-size: 2rem; margin-bottom: 1.5rem; border-bottom: 2px solid #e1e4e8; padding-bottom: 0.5rem; }

/* 表格 */
table { width: 100%; border-collapse: collapse; background: white; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
th { background: #f1f3f5; font-weight: 600; padding: 0.8rem 1rem; text-align: left; }
td { padding: 0.7rem 1rem; border-top: 1px solid #eaeef2; }
tr:hover { background: #f6f8fa; }
.status-pending { color: #f0ad4e; }
.status-compiling { color: #5bc0de; }
.status-running { color: #5bc0de; }
.status-accepted { color: #28a745; font-weight: bold; }
.status-wrong_answer { color: #d73a49; }
.status-time_limit_exceeded { color: #d73a49; }
.status-memory_limit_exceeded { color: #d73a49; }
.status-compile_error { color: #d73a49; }
.status-system_error { color: #6c757d; }
.status-cancelled { color: #6c757d; }

/* 按钮 */
.btn { display: inline-block; padding: 0.5rem 1.2rem; background: #0366d6; color: white; border: none; border-radius: 6px; cursor: pointer; font-size: 0.95rem; }
.btn:hover { background: #0256b3; }
.btn-danger { background: #d73a49; }
.btn-danger:hover { background: #b92534; }
.btn-success { background: #28a745; }
.btn-success:hover { background: #1e8e3e; }

/* 表单 */
.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 0.6rem; border: 1px solid #d1d5da; border-radius: 6px; font-size: 1rem; }
.form-group textarea { min-height: 150px; font-family: monospace; }

/* 卡片 */
.card { background: white; border-radius: 8px; padding: 1.5rem; box-shadow: 0 1px 3px rgba(0,0,0,0.08); margin-bottom: 1.5rem; }

/* 分页 */
.pagination { display: flex; gap: 0.5rem; justify-content: center; margin-top: 1.5rem; }
.pagination a, .pagination span { padding: 0.3rem 0.8rem; border: 1px solid #d1d5da; border-radius: 4px; background: white; }
.pagination .active { background: #0366d6; color: white; border-color: #0366d6; }

/* 代码区 */
pre { background: #f6f8fa; border-radius: 6px; padding: 1rem; overflow: auto; border: 1px solid #e1e4e8; font-size: 0.9rem; max-height: 400px; }

/* 管理员入口 */
.admin-badge { background: #f0b400; color: #24292e; padding: 0.2rem 0.6rem; border-radius: 12px; font-size: 0.75rem; font-weight: bold; margin-left: 0.5rem; }

/* 响应式 */
@media (max-width: 768px) {
  nav { flex-direction: column; align-items: stretch; gap: 0.5rem; }
  nav .right { justify-content: flex-start; flex-wrap: wrap; }
  table { font-size: 0.85rem; }
  .container { padding: 0 0.8rem; }
}